WO2013018647A1 - Display panel unevenness correction method, drive circuit, and display device - Google Patents

Display panel unevenness correction method, drive circuit, and display device Download PDF

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Publication number
WO2013018647A1
WO2013018647A1 PCT/JP2012/068949 JP2012068949W WO2013018647A1 WO 2013018647 A1 WO2013018647 A1 WO 2013018647A1 JP 2012068949 W JP2012068949 W JP 2012068949W WO 2013018647 A1 WO2013018647 A1 WO 2013018647A1
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Prior art keywords
image data
display
display panel
charge amount
compensation
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PCT/JP2012/068949
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French (fr)
Japanese (ja)
Inventor
真介 横沼
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シャープ株式会社
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Publication of WO2013018647A1 publication Critical patent/WO2013018647A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention relates to a display panel unevenness correction method, and more particularly to a technique for correcting display unevenness based on a change in cell thickness of a display panel.
  • luminance unevenness and color unevenness that occurs in a display image
  • display unevenness greatly affect image quality. It is necessary to correct appropriately.
  • Patent Document 1 discloses a technique for detecting a current flowing through a scanning line of a display panel in order to compensate for the temperature characteristics of the display panel.
  • the present invention has been made in view of such a situation, and an object thereof is to correct display unevenness caused by a change in cell thickness.
  • the present invention provides a display panel unevenness correction method for correcting display unevenness of a display panel having a predetermined cell thickness, wherein the display panel is applied by applying reference data to the display panel.
  • the amount of accumulated charge supplied to the display panel when reference data is applied to the display panel is calculated and compared with the amount of reference charge.
  • the accumulated charge amount changes based on the reference data, that is, the voltage applied to the display panel, and also changes based on the cell thickness of the display panel, that is, the distance between two glass substrates constituting the display panel.
  • the cell thickness of the display panel is managed so as to have a constant reference width, but may vary to a cell thickness different from the reference width due to variations in the manufacturing process. Therefore, the accumulated charge amount calculated when the reference data is applied may be different from the reference charge amount.
  • compensation image data is generated based on the result of comparing the calculated integrated charge amount with the reference charge amount. According to this unevenness correction method, the variation in the cell thickness of the display panel can be compensated using the compensation image data, and the display characteristics of the display panel can be maintained high.
  • Display image data corresponding to the reference data is set on the display panel.
  • a comparison result indicating a ratio of the accumulated charge amount to the reference charge amount is calculated, and the display image data is
  • the compensation image data is preferably generated by dividing by the comparison result.
  • the accumulated charge amount is proportional to the voltage applied to the display panel and inversely proportional to the cell thickness of the display panel. According to this display panel unevenness correction method, the amount of charge actually supplied to the display panel can be maintained at the reference charge amount by offsetting the variation in cell thickness with the voltage applied to the display panel. The display characteristics of the display panel can be kept high.
  • the display image data includes reference image data
  • the display image data is set from the reference image data
  • the reference data is equal to the reference image data. According to this display panel unevenness correction method, it is easy to calculate the compensation image data by using the reference image data that is the basis for setting the display image data as the reference data.
  • the display panel includes a plurality of display elements, and the compensation image data is generated for each display element.
  • the compensation image data differs for each display element because the cell thickness is different for each display element.
  • the compensation image data is generated for each display element, so that the display characteristics of each display element can be maintained high.
  • a first display element disposed at a center portion of the display panel and a second display element disposed at an end portion of the display panel are disposed.
  • a first accumulated charge amount in the first display element and a second accumulated charge amount in the second display element are calculated, and the compensation step uses the first accumulated charge amount to calculate the first accumulated charge amount in the first display element.
  • Compensation image data is generated, and second compensation image data in the second display element is generated using the second accumulated charge amount, and is further arranged between the first display element and the second display element.
  • intermediate compensation image data having an intermediate value between the first compensation image data and the second compensation image data is generated from the first compensation image data and the second compensation image data. preferable.
  • the cell thickness of the display panel usually varies continuously, and is arranged between the first display element arranged at the center of the display panel and the second display element arranged at the end of the display panel.
  • the compensation image data of the intermediate display element is an intermediate value between the first compensation image data in the first display element and the second compensation image data in the second display element.
  • the intermediate compensation image data of the intermediate display element is obtained from the first compensation image data and the second compensation image data. Generate. Accordingly, it is easier to generate the compensation image data than in the case where the accumulated charge amount is calculated for the intermediate display element and the intermediate compensation image data is generated from the accumulated charge amount.
  • the display panel includes a first substrate and a second substrate disposed to face each other, and a cell thickness between the first substrate and the second substrate is linear from an end portion to a central portion of the display panel.
  • the intermediate compensation image data is based on at least one of a distance between the first display element and the intermediate display element and a distance between the second display element and the intermediate display element. Preferably it is produced.
  • intermediate compensation image data of the intermediate display element is generated using the distance from the first display element or the second display element. By doing so, it is easy to generate intermediate compensation image data.
  • the display panel includes a first substrate and a second substrate disposed to face each other, and a cell thickness between the first substrate and the second substrate is a prescribed curve from an end portion to a central portion of the display panel. It is preferable that the intermediate compensation image data is generated based on the prescribed curve. When the cell thickness between the first display element and the second display element varies along the prescribed curve, the intermediate compensation image data of the intermediate display element is generated based on the prescribed curve, so that the intermediate compensation image is generated. Easy to generate data.
  • data indicating the prescribed curve is stored for each display element corresponding to the arrangement of the display elements.
  • the data of the prescribed curve for each display element is stored in advance, so that it is easy to generate intermediate compensated image data of the intermediate display element based on the prescribed curve.
  • the display panel has a plurality of selection display elements arranged at equal intervals in a first direction and a second direction orthogonal to the first direction.
  • the selection integration in the selection display elements is performed.
  • a charge amount is calculated, and in the compensation step, the compensated image data in the selected display element is generated using the selected integrated charge amount, and is further adjacent to a non-selected display element that is not the selected display element. It is preferable that the compensation image data is generated using the compensation image data of the selection display element.
  • the cell thickness of the display panel usually varies continuously.
  • the cell thickness of the non-selected display element that is not the selective display element is The value approximates the cell thickness of the adjacent selection display element. Therefore, the compensation image data of the non-selected display element is a value that approximates the compensation image data of the adjacent selected display element.
  • the compensation image data of the non-selected display element is generated using the compensation image data of the selected display element. This makes it easier to calculate the compensation image data than in the case where the accumulated charge amount is calculated for the non-selected display element and the compensation image data of the non-selected display element is generated from the accumulated charge amount.
  • the present invention is also embodied in a drive circuit that realizes the display panel unevenness correction method.
  • the present invention is a display panel driving circuit for displaying a display panel having a predetermined cell thickness, the display circuit applying a reference data to the display panel to display the display panel, and the reference data being applied. And calculating a cumulative charge amount by integrating the current supplied to the display panel, and comparing the cumulative charge amount with a reference charge amount set corresponding to the reference data. And a compensation circuit for generating compensation image data that compensates for variations in cell thickness.
  • this drive circuit when the display panel is displayed using the drive circuit, the display panel is displayed using the compensation image data corresponding to the variation in the cell thickness of the display panel, thereby displaying the display characteristics of the display panel. Can be kept high.
  • the present invention is also embodied in a display device that includes the above drive circuit and the display panel that performs display based on compensated image data compensated by the drive circuit. According to this display device, the display characteristics of the display device can be maintained high by displaying the display panel using the compensation image data corresponding to the variation in the cell thickness of the display panel.
  • the display panel is a liquid crystal display panel using liquid crystal.
  • the display characteristics of the liquid crystal display device are displayed by displaying the liquid crystal display panel using the compensation image data corresponding to the cell thickness variation of the liquid crystal display panel. Can be kept high.
  • FIG. 10 is a diagram for explaining image data correction processing according to the fourth embodiment.
  • the display device 10 includes a control circuit 12, a display unit 14, and a backlight control circuit 16.
  • the display unit 14 includes a liquid crystal panel 20 and a backlight unit 30.
  • the control circuit 12 includes a voltage generation unit 13 in addition to inputting a gate signal and a data signal, which are digital signals, to the liquid crystal panel 20 based on an input image supplied from an external device (not shown). Analog reference voltages VH and VL and a common voltage are input to the liquid crystal panel 20 to drive the liquid crystal panel 20.
  • the backlight control circuit 16 drives the backlight unit 30. The backlight control circuit 16 may drive the backlight unit 30 independently of the control circuit 12 if the backlight unit 30 may be driven in conjunction with the control circuit 12.
  • the backlight unit 30 is disposed on the back surface of the liquid crystal panel 20.
  • the backlight unit 30 includes a diffusion plate 32 and an LED 34 (Light Emitting Diode: light emitting diode) that is a light source.
  • the LED 34 is disposed to face the back surface of the diffusion plate 32.
  • the main surface of the diffusion plate 32 is disposed to face the liquid crystal panel 20.
  • the diffusing plate 32 the light from the LED 34 is incident from the back side, the incident light is transmitted with diffusion, and the diffused light is irradiated to the liquid crystal panel 20 from the main surface facing the liquid crystal panel 20.
  • the backlight unit 30 is a so-called direct type in which the LEDs 34 are disposed on the back side on the depth side and a diffusion plate 32 is disposed on the front surface.
  • FIG. 2 shows an equivalent circuit of the picture element 42.
  • the liquid crystal panel 20 includes two glass substrates 40A and 40B arranged to face each other.
  • a glass substrate 40A indicated by a solid line in FIG. 2 is provided with a plurality of gate lines 44 and a plurality of data lines 46 extending between the plurality of picture elements 42, and includes a switch device 48 and a pixel electrode 50.
  • the gate line 44 and the data line 46 extend in directions orthogonal to each other.
  • the switch device 48 is provided with a switch electrode 48A and data electrodes 48B and 48C.
  • the switch electrode 48A is connected to the corresponding gate line 44.
  • One data electrode 48 ⁇ / b> B is connected to the corresponding data line 46.
  • the other data electrode 48 ⁇ / b> C is connected to the pixel electrode 50.
  • the counter electrode 52 is disposed to face the pixel electrode 50 through liquid crystal molecules sealed between the glass substrates 40 ⁇ / b> A and 40 ⁇ / b> B.
  • the pixel electrode 50 and the counter electrode 52 are spaced apart by a cell thickness L indicating the distance between the glass substrates 40A and 40B.
  • a gate driver 26 and a source driver (an example of a drive circuit) 28 are mounted on the frame region 24 of the liquid crystal panel 20.
  • the gate driver 26 uses the gate signal and analog reference voltages VH and VL input from the control circuit 12 to generate a gate voltage for switching on / off the switch device 48 of the pixel 42, and passes through the gate line 44. The voltage is applied to the switch electrode 48A of each picture element 42.
  • the source driver 28 generates image data V to be applied to the pixel electrode 50 of the picture element 42 using the data signal input from the control circuit 12 and the analog reference voltages VH and VL, and each picture element via the data line 46. 42 pixel electrodes 50 are applied.
  • FIG. 3 shows the circuit configuration of the source driver 28.
  • the source driver 28 includes an image data generation circuit (an example of a display circuit) 60, a current detection circuit (an example of a calculation circuit) 62, a charge amount comparison circuit (an example of a compensation circuit) 64, and an image data correction circuit (a compensation circuit).
  • Example 66 shows the circuit configuration of the source driver 28.
  • the image data generation circuit 60 receives the data signal from the control circuit 12 and the display image data D from the image data correction circuit 66, and obtains the image data V from the input data signal and the display image data D.
  • the image data V is generated and applied to the data line 46.
  • the image data generation circuit 60 supplies a current to the data line 46 and supplies a charge amount necessary for generating the image data V to the pixel electrode 50 of each pixel 42.
  • the current detection circuit 62 detects the current flowing through the data line 46 and inputs the detected current value to the charge amount comparison circuit 64.
  • the charge amount comparison circuit 64 uses, based on the current value input from the current detection circuit 62, the current supplied to the data line 46 when the image data generation circuit 60 applies the image data V to the pixel electrode 50 of each pixel 42. Accumulated to calculate the accumulated charge amount.
  • the charge amount comparison circuit 64 stores a reference charge amount in advance, and inputs the calculated comparison result to the image data correction circuit 66.
  • the image data correction circuit 66 receives the analog reference voltages VH and VL from the control circuit 12, generates display image data D from the input analog reference voltages VH and VL, and inputs the display image data D to the image data generation circuit 60. Further, when the image data correction circuit 66 receives the comparison result from the charge amount comparison circuit 64, the image data correction circuit 66 corrects the display image data D based on the comparison result, generates the compensation image data H, and inputs it to the image data generation circuit 60. To do.
  • the image data generation circuit 60 generates the image data V using the compensation image data H after the display image data D is inputted or when the compensation image data H is inputted instead of the display image data D.
  • the control circuit 12 applies a gate voltage to the gate line 44 and applies image data V to the data line 46.
  • the amount of charge necessary to generate image data V in each picture element 42 through the switch device 48 while the switch device 48 is turned on by the input of the on voltage of the gate voltage is a pixel.
  • Supplied to the electrode 50 As a result, in the pixel 42, a voltage corresponding to the image data V is generated between the pixel electrode 50 and the counter electrode 52 due to the amount of charge supplied to the pixel electrode 50, and this voltage is applied to the liquid crystal molecules, thereby deflecting the liquid crystal molecules. Change.
  • the picture element 42 is set to a desired light transmittance, and the picture element 42 enters a display state.
  • a desired charge amount Q that needs to be supplied to the pixel electrode 50 of the picture element 42 in order to achieve a desired light transmittance is determined in advance.
  • This charge amount Q is expressed as follows using the cell thickness L and the image data V, the dielectric constant ⁇ of the liquid crystal molecules, and the area S of the pixel electrode 50.
  • the dielectric constant ⁇ of the liquid crystal molecules and the area S of the pixel electrode 50 are strictly controlled in the manufacturing stage, while the cell thickness L of the liquid crystal panel 20 may vary due to variations in the manufacturing process.
  • a spacer 54 having a reference width L ⁇ b> 0 is inserted into the frame area 24 adjacent to the display area 22. Therefore, the cell thickness L is set to the reference width L0 at the end of the display area 22.
  • the cell thickness L of the liquid crystal panel 20 is a thickness L1 different from the reference width L0
  • the image data V generated from the display image data D set based on the reference width L0 is used as the pixel electrode 50 of the picture element 42.
  • the desired charge amount Q cannot be supplied to the pixel electrode 50 of the picture element 42 even if applied to. Therefore, a desired light transmittance cannot be realized in the picture element 42, and display unevenness occurs.
  • the correction processing of the image data V is executed using the image data generation circuit 60 included in the source driver 28 of the liquid crystal panel 20.
  • Image data correction processing will be described with reference to FIG.
  • the image data correction process is executed for each picture element 42 of the liquid crystal panel 20.
  • display image data D is input from the image data correction circuit 66 to the image data generation circuit 60.
  • the display image data D is composed of a plurality of image data D0, D1,..., And these image data D0, D1,.
  • An example of data and reference image data) D0 is generated by resistance voltage division by a preset resistance group.
  • the source driver 28 starts processing upon receiving an image data correction processing instruction from the control circuit 12, and applies the reference image data D0 to the target pixel 42 (S2).
  • the current detection circuit 62 detects the current flowing through the data line 46 connected to the target pixel 42 (S4) and inputs it to the charge amount comparison circuit 64.
  • the charge amount comparison circuit 64 calculates the integrated charge amount Q1 supplied to the data line 46 when applying the reference image data D0 to the target pixel 42 from the current value detected by the current detection circuit 62 (S6). ).
  • a reference charge amount Q0 corresponding to the reference image data D0 is preset in the charge amount comparison circuit 64, and the charge amount comparison circuit 64 calculates a comparison result F from the calculated integrated charge amount Q1 and the reference charge amount Q0. (S8) and input to the image data correction circuit 66.
  • Q0 ( ⁇ * S / L0) * D0
  • Q1 ( ⁇ * S / L1) * D0
  • F Q1 / Q0
  • the image data correction circuit 66 inputs the generated compensated image data H to the image data generation circuit 60 (S12).
  • the image data generation circuit 60 generates the image data V using the compensation image data H in place of the display image data D input in advance. That is, in the present embodiment, the variation in the charge amount from the reference charge amount Q0 to the accumulated charge amount Q1 caused by the variation in the cell thickness L is corrected by changing the display image data D to the compensation image data H. Compensation.
  • the reference image data D0 is corrected to generate the reference compensation image data H0, and the compensation image data H is generated using the reference compensation image data H0.
  • the compensation image data is generated from the reference compensation image data H0 using the resistance group used to generate the display image data D from the reference image data D0. H can be generated, and the compensation image data H can be easily generated.
  • the display device 10 of the present embodiment is different from the display device 10 of the first embodiment in that the integrated charge amount Q1 is not calculated for all the picture elements 42 included in the liquid crystal panel 20 in the image data correction process.
  • the cell thickness L of the liquid crystal panel 20 may vary symmetrically in the left and right and up and down directions of the liquid crystal panel 20 with the central portion of the display region 22 as a boundary. Further, when the cell thickness L of the liquid crystal panel 20 varies, the cell thickness L may vary linearly from the end to the center of the display region 22. In the present embodiment, when the cell thickness L of the liquid crystal panel 20 varies linearly from the end to the center of the display area 22, the compensation image data H is obtained using the fact that the cell thickness L varies linearly. calculate.
  • the compensation image data HB is generated by the same method as in the first embodiment.
  • the compensation image data HC at the point C in the line segment AB is generated using the compensation image data HA and the compensation image data HB.
  • the distance between point A and point C is W (AC).
  • the distance between point B and point C is W (BC).
  • the compensation image data HB is the same over the entire circumference of the liquid crystal panel 20. Therefore, the compensation image data H can be generated for all the picture elements 42 of the liquid crystal panel 20 by using the compensation image data HA and the compensation image data HB.
  • the compensated image data HB is equal to the display image data D, and therefore it is necessary to obtain the compensated image data HB. Absent.
  • a third embodiment of the present invention will be described with reference to FIG.
  • the display device 10 of the present embodiment is different from that of the second embodiment in that the cell thickness L of the liquid crystal panel 20 is not linear from the end to the center of the display region 22 but varies along the prescribed curve Z. Different from the display device 10.
  • the liquid crystal panel 20 may be deformed along a certain suspension curve due to drooping due to the weight of the glass substrates 40A and 40B, and as shown in FIG.
  • the cell thickness L of the liquid crystal panel 20 may fluctuate along a certain prescribed curve Z.
  • the specified curve Z is stored in the source driver 28, and specifically, data indicating the specified curve Z is stored for each pixel 42 of the liquid crystal panel 20.
  • the compensation image data HC at the point C on the line segment AB is calculated using the prescribed curve Z, the compensation image data HA, and the compensation image data HB.
  • the prescribed curve Z, the compensation image data HA, and Compensation image data HC at point C on line segment AB is generated from compensation image data HB.
  • Embodiment 4 of the present invention will be described with reference to FIG.
  • the selected picture element in the image data correction process, the selected picture element is selected for each specified distance K in the first direction DL1 along the gate line 44 of the liquid crystal panel 20 and in the second direction DL2 along the data line 46. 42S is designated.
  • the integrated charge amount Q1 is calculated only for the selected picture element 42S, and the integrated charge amount Q1 is not calculated for the non-selected picture element 42N that is another picture element 42. 1 different from the display device 10 of FIG.
  • the cell thickness L of the liquid crystal panel 20 varies, a local variation of the cell thickness L may occur in a part of the liquid crystal panel 20, and the cell thickness L does not vary symmetrically in the left-right and vertical directions of the liquid crystal panel 20.
  • the compensation image data HS of the selected picture element 42S designated for each specified distance K appropriate compensation image data H can be obtained even when the cell thickness L of the liquid crystal panel 20 varies locally.
  • the compensated image data HS in the selected picture element 42S of the liquid crystal panel 20 is obtained by the same method as in the first embodiment.
  • the selected picture element 42S adjacent to the non-selected picture element 42N in FIG. 9, four selected pictures.
  • Element 42S is selected, and the compensation image data HN of the non-selected picture element 42N is calculated using the compensation picture data HS of the selected picture element 42S.
  • the compensation image data HN of the non-selected picture element 42N is calculated from the compensation image data HS of the selected picture element 42S. Even when the cell thickness L of the liquid crystal panel 20 varies locally, the cell thickness L varies continuously when considering each part of the liquid crystal panel 20. Therefore, when the selected picture element 42S is arranged at the specified distance K in the first direction DL1 and the second direction DL2 of the liquid crystal panel 20, the cell thickness of the non-selected picture element 42N is the cell of the adjacent selected picture element 42S. The value approximates the thickness L.
  • the compensation image data HN of the non-selected picture element 42N becomes a value approximate to the compensation image data HS of the selected picture element 42S. Therefore, when calculating the compensation image data HN, it is not necessary to calculate the accumulated charge amount Q1 for the non-selected picture element 42N, and the compensation image data HN can be easily calculated.
  • the embodiment of the present invention is not limited to this.
  • the image data correction process may be executed every fixed usage period of the display device 10.
  • the light source using the LED as the light source is exemplified, but a light source other than the LED may be used.

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  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
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Abstract

Processing for this display unevenness correction for a liquid crystal panel includes the following steps. (1) Applying reference image data (D0) to the liquid crystal panel and making the liquid crystal panel display the same (S2). (2) Calculating an integrated charge amount (Q1) by integrating the current values supplied to the liquid crystal panel when the reference image data (D0) is applied (S6). (3) Comparing the integrated charge amount (Q1) with a reference charge amount (Q0) and generating image correction data (H) for correcting variations in cell thickness (L) for the liquid crystal panel (S8, S10). In this processing, the liquid crystal panel display characteristics can be maintained at a high level by correcting the variations in the cell thickness (L) of the liquid crystal panel using the image correction data (H).

Description

表示パネルのムラ補正方法、駆動回路、表示装置Display panel unevenness correction method, drive circuit, and display device
　本発明は、表示パネルのムラ補正方法に関し、特に表示パネルのセル厚の変動に基づく表示ムラを補正する技術に関する。 The present invention relates to a display panel unevenness correction method, and more particularly to a technique for correcting display unevenness based on a change in cell thickness of a display panel.
　近年、大画面テレビジョンなどの高性能な表示装置が普及しつつある。これらの表示装置においては、表示画像に発生する輝度ムラや色ムラ（以後、輝度ムラと色ムラをあわせて「表示ムラ」と呼ぶことがある）が画質に大きな影響を与えるため、表示ムラを適切に補正することが必要となる。 In recent years, high-performance display devices such as large-screen televisions are becoming widespread. In these display devices, luminance unevenness and color unevenness that occurs in a display image (hereinafter, luminance unevenness and color unevenness may be referred to as “display unevenness”) greatly affect image quality. It is necessary to correct appropriately.
　従来から、表示ムラを補正する技術が開発されている（例えば、特許文献１）。例えば、従来技術１では、表示パネルの温度特性を補償するために、表示パネルの走査線に流れる電流を検出する技術が開示されている。 Conventionally, a technique for correcting display unevenness has been developed (for example, Patent Document 1). For example, the prior art 1 discloses a technique for detecting a current flowing through a scanning line of a display panel in order to compensate for the temperature characteristics of the display panel.
特開２０００－８９１９８号公報JP 2000-89198 A
（発明が解決しようとする課題）
　表示ムラの原因の一つとして、セル厚の変動による表示ムラが知られている。例えば、液晶を用いた表示パネルでは、２枚のガラス基板の間のセル厚が変動すると、所定の透過率を実現するために液晶に印加する必要がある電圧が変化してしまい、表示パネルに供給する必要のある電荷量が変化してしまう。表示パネルのセル厚の変動は、製造プロセスによるバラツキの他、ガラス基板の重さによる垂み等によっても発生することがあり、これらに起因した表示ムラを抑制することができる技術が望まれている。 (Problems to be solved by the invention)
As one of the causes of display unevenness, display unevenness due to variation in cell thickness is known. For example, in a display panel using liquid crystal, when the cell thickness between two glass substrates varies, the voltage that needs to be applied to the liquid crystal to achieve a predetermined transmittance changes, and the display panel The amount of charge that needs to be supplied changes. Variations in the cell thickness of the display panel may occur due to variations in the manufacturing process as well as sagging due to the weight of the glass substrate, and a technique capable of suppressing display unevenness due to these is desired. Yes.
　本発明は、このような状況に鑑みてなされたものであり、セル厚の変動に起因した表示ムラを補正することを目的とする。 The present invention has been made in view of such a situation, and an object thereof is to correct display unevenness caused by a change in cell thickness.
（課題を解決するための手段）
　上記課題を解決するために、本発明は、所定のセル厚を有する表示パネルの表示ムラを補正する表示パネルのムラ補正方法であって、前記表示パネルに基準データを印加して前記表示パネルを表示させる表示工程と、前記表示工程において前記基準データが印加される際に前記表示パネルに供給される電流を積算して積算電荷量を算出する算出工程と、前記積算電荷量を前記基準データに対応して設定された基準電荷量と比較して前記表示パネルのセル厚の変動を補償する補償画像データを生成する補償工程と、を含むことを特徴とする。 (Means for solving the problem)
In order to solve the above problems, the present invention provides a display panel unevenness correction method for correcting display unevenness of a display panel having a predetermined cell thickness, wherein the display panel is applied by applying reference data to the display panel. A display step of displaying, a calculation step of calculating an integrated charge amount by integrating a current supplied to the display panel when the reference data is applied in the display step, and the integrated charge amount as the reference data A compensation step of generating compensation image data for compensating for variations in the cell thickness of the display panel in comparison with a corresponding reference charge amount.
　この表示パネルのムラ補正方法では、表示パネルに基準データを印加する際に表示パネルに供給される積算電荷量を算出し、基準電荷量と比較する。積算電荷量は、基準データ、つまり表示パネルに印加される電圧に基づいて変化するとともに、表示パネルのセル厚、つまり表示パネルを構成する２枚のガラス基板間距離に基づいて変化する。通常、表示パネルのセル厚は、一定の基準幅となるように管理されているものの、製造プロセスによるバラツキ等により基準幅と異なるセル厚に変動することがある。そのため、基準データを印加した場合に算出される積算電荷量が基準電荷量と異なる値となることがある。このムラ補正方法では、算出された積算電荷量を基準電荷量と比較した結果に基づいて補償画像データを生成する。このムラ補正方法によれば、表示パネルのセル厚の変動を補償画像データを用いて補償することができ、表示パネルの表示特性を高く維持することができる。 In this display panel unevenness correction method, the amount of accumulated charge supplied to the display panel when reference data is applied to the display panel is calculated and compared with the amount of reference charge. The accumulated charge amount changes based on the reference data, that is, the voltage applied to the display panel, and also changes based on the cell thickness of the display panel, that is, the distance between two glass substrates constituting the display panel. Normally, the cell thickness of the display panel is managed so as to have a constant reference width, but may vary to a cell thickness different from the reference width due to variations in the manufacturing process. Therefore, the accumulated charge amount calculated when the reference data is applied may be different from the reference charge amount. In this unevenness correction method, compensation image data is generated based on the result of comparing the calculated integrated charge amount with the reference charge amount. According to this unevenness correction method, the variation in the cell thickness of the display panel can be compensated using the compensation image data, and the display characteristics of the display panel can be maintained high.
　前記表示パネルには、前記基準データに対応した表示画像データが設定されており、前記補償工程では、前記基準電荷量に対する前記積算電荷量の比を示す比較結果を算出し、前記表示画像データを前記比較結果で除して前記補償画像データを生成することが好ましい。積算電荷量は、表示パネルに印加される電圧に比例し、表示パネルのセル厚に反比例する。この表示パネルのムラ補正方法によれば、セル厚の変動を表示パネルに印加される電圧により相殺することで、表示パネルに実際に供給される電荷量を基準電荷量に維持することができ、表示パネルの表示特性を高く維持することができる。 Display image data corresponding to the reference data is set on the display panel. In the compensation step, a comparison result indicating a ratio of the accumulated charge amount to the reference charge amount is calculated, and the display image data is The compensation image data is preferably generated by dividing by the comparison result. The accumulated charge amount is proportional to the voltage applied to the display panel and inversely proportional to the cell thickness of the display panel. According to this display panel unevenness correction method, the amount of charge actually supplied to the display panel can be maintained at the reference charge amount by offsetting the variation in cell thickness with the voltage applied to the display panel. The display characteristics of the display panel can be kept high.
　前記表示画像データには、基準画像データが含まれ、前記基準画像データから前記表示画像データが設定されており、前記基準データは、前記基準画像データに等しいことが好ましい。この表示パネルのムラ補正方法によれば、表示画像データを設定する基となる基準画像データを基準データとして用いることで、補償画像データを算出しやすい。 It is preferable that the display image data includes reference image data, the display image data is set from the reference image data, and the reference data is equal to the reference image data. According to this display panel unevenness correction method, it is easy to calculate the compensation image data by using the reference image data that is the basis for setting the display image data as the reference data.
　前記表示パネルには、複数の表示素子が含まれており、前記補償画像データは前記表示素子毎に生成されることが好ましい。表示パネルに複数の表示素子が含まれている場合、各表示素子においてセル厚が異なることから、表示素子毎に補償画像データが異なる。この表示パネルのムラ補正方法によれば、補償画像データが表示素子毎に生成されるので、各表示素子の表示特性を高く維持することができる。 Preferably, the display panel includes a plurality of display elements, and the compensation image data is generated for each display element. When a plurality of display elements are included in the display panel, the compensation image data differs for each display element because the cell thickness is different for each display element. According to the unevenness correction method for the display panel, the compensation image data is generated for each display element, so that the display characteristics of each display element can be maintained high.
　前記表示パネルには、前記表示パネルの中央部に配置された第１表示素子と、前記表示パネルの端部に配置された第２表示素子と、が配置されており、前記算出工程では、前記第１表示素子における第１積算電荷量と、前記第２表示素子における第２積算電荷量と、を算出し、前記補償工程では、前記第１積算電荷量を用いて第１表示素子における第１補償画像データを生成するとともに、前記第２積算電荷量を用いて前記第２表示素子における第２補償画像データを生成し、さらに、前記第１表示素子と第２表示素子の中間に配置された中間表示素子に対して、前記第１補償画像データと前記第２補償画像データから、前記第１補償画像データと前記第２補償画像データの中間の値となる中間補償画像データを生成することが好ましい。 In the display panel, a first display element disposed at a center portion of the display panel and a second display element disposed at an end portion of the display panel are disposed. In the calculation step, A first accumulated charge amount in the first display element and a second accumulated charge amount in the second display element are calculated, and the compensation step uses the first accumulated charge amount to calculate the first accumulated charge amount in the first display element. Compensation image data is generated, and second compensation image data in the second display element is generated using the second accumulated charge amount, and is further arranged between the first display element and the second display element. For the intermediate display element, intermediate compensation image data having an intermediate value between the first compensation image data and the second compensation image data is generated from the first compensation image data and the second compensation image data. preferable.
　表示パネルのセル厚は、通常連続的に変動しており、表示パネルの中央部に配置された第１表示素子と、表示パネルの端部に配置された第２表示素子の間に配置された中間表示素子では、第１表示素子におけるセル厚と第２表示素子におけるセル厚の中間のセル厚となる。そのため、当該中間表示素子の補償画像データは、第１表示素子における第１補償画像データと第２表示素子における第２補償画像データの中間の値となる。この表示パネルのムラ補正方法では、第１補償画像データと第２補償画像データが生成されている場合に、中間表示素子の中間補償画像データを当該第１補償画像データと第２補償画像データから生成する。これによって、中間表示素子に対して積算電荷量を算出し、この積算電荷量から中間補償画像データを生成する場合に比べて、補償画像データを生成しやすい。 The cell thickness of the display panel usually varies continuously, and is arranged between the first display element arranged at the center of the display panel and the second display element arranged at the end of the display panel. In the intermediate display element, the cell thickness is intermediate between the cell thickness in the first display element and the cell thickness in the second display element. Therefore, the compensation image data of the intermediate display element is an intermediate value between the first compensation image data in the first display element and the second compensation image data in the second display element. In this display panel unevenness correction method, when the first compensation image data and the second compensation image data are generated, the intermediate compensation image data of the intermediate display element is obtained from the first compensation image data and the second compensation image data. Generate. Accordingly, it is easier to generate the compensation image data than in the case where the accumulated charge amount is calculated for the intermediate display element and the intermediate compensation image data is generated from the accumulated charge amount.
　前記表示パネルは、互いに対向して配置される第１基板と第２基板を含み、前記第１基板と前記第２基板の間のセル厚が、前記表示パネルの端部から中央部にかけて直線状に変動しており、前記中間補償画像データは、前記第１表示素子と前記中間表示素子との間の距離と前記第２表示素子と前記中間表示素子との間の距離の少なくとも一方に基づいて生成されることが好ましい。第１表示素子と第２表示素子の間のセル厚が直線的に変動している場合、中間表示素子の中間補償画像データを、第１表示素子または第２表示素子からの距離を用いて生成することで、中間補償画像データを生成しやすい。 The display panel includes a first substrate and a second substrate disposed to face each other, and a cell thickness between the first substrate and the second substrate is linear from an end portion to a central portion of the display panel. The intermediate compensation image data is based on at least one of a distance between the first display element and the intermediate display element and a distance between the second display element and the intermediate display element. Preferably it is produced. When the cell thickness between the first display element and the second display element varies linearly, intermediate compensation image data of the intermediate display element is generated using the distance from the first display element or the second display element. By doing so, it is easy to generate intermediate compensation image data.
　前記表示パネルは、互いに対向して配置される第１基板と第２基板を含み、前記第１基板と前記第２基板の間のセル厚が、前記表示パネルの端部から中央部にかけて規定曲線に沿って変動しており、前記中間補償画像データは、前記規定曲線に基づいて生成されることが好ましい。第１表示素子と第２表示素子の間のセル厚が規定曲線に沿って変動している場合、中間表示素子の中間補償画像データを、この規定曲線に基づいて生成することで、中間補償画像データを生成しやすい。 The display panel includes a first substrate and a second substrate disposed to face each other, and a cell thickness between the first substrate and the second substrate is a prescribed curve from an end portion to a central portion of the display panel. It is preferable that the intermediate compensation image data is generated based on the prescribed curve. When the cell thickness between the first display element and the second display element varies along the prescribed curve, the intermediate compensation image data of the intermediate display element is generated based on the prescribed curve, so that the intermediate compensation image is generated. Easy to generate data.
　前記規定曲線を示すデータが、各表示素子の配置に対応して前記表示素子毎に記憶されていることが好ましい。この表示パネルのムラ補正方法によれば、表示素子毎の規定曲線のデータが予め記憶されているので、規定曲線に基づいて中間表示素子の中間補償画像データを生成しやすい。 It is preferable that data indicating the prescribed curve is stored for each display element corresponding to the arrangement of the display elements. According to this display panel unevenness correction method, the data of the prescribed curve for each display element is stored in advance, so that it is easy to generate intermediate compensated image data of the intermediate display element based on the prescribed curve.
　前記表示パネルには、第１方向及び前記第１方向と直交する第２方向に等間隔に配置された複数の選択表示素子が配置されており、前記算出工程では、前記選択表示素子における選択積算電荷量を算出し、前記補償工程では、前記選択積算電荷量を用いて前記選択表示素子における前記補償画像データを生成し、さらに、前記選択表示素子ではない非選択表示素子に対して、隣接する前記選択表示素子の前記補償画像データを用いて前記補償画像データを生成することが好ましい。 The display panel has a plurality of selection display elements arranged at equal intervals in a first direction and a second direction orthogonal to the first direction. In the calculation step, the selection integration in the selection display elements is performed. A charge amount is calculated, and in the compensation step, the compensated image data in the selected display element is generated using the selected integrated charge amount, and is further adjacent to a non-selected display element that is not the selected display element. It is preferable that the compensation image data is generated using the compensation image data of the selection display element.
　表示パネルのセル厚は、通常連続的に変動しており、表示パネルの異なる２方向に等間隔に選択表示素子が配置されている場合、選択表示素子ではない非選択表示素子のセル厚は、隣接する選択表示素子のセル厚に近似した値となる。そのため、非選択表示素子の補償画像データは、隣接する選択表示素子の補償画像データに近似した値となる。この表示パネルのムラ補正方法によれば、選択表示素子の補償画像データが生成されている場合に、非選択表示素子の補償画像データを選択表示素子の補償画像データを用いて生成する。これによって、非選択表示素子に対して積算電荷量を算出し、この積算電荷量から非選択表示素子の補償画像データを生成する場合に比べて、補償画像データを算出しやすい。 The cell thickness of the display panel usually varies continuously. When the selective display elements are arranged at equal intervals in two different directions of the display panel, the cell thickness of the non-selected display element that is not the selective display element is The value approximates the cell thickness of the adjacent selection display element. Therefore, the compensation image data of the non-selected display element is a value that approximates the compensation image data of the adjacent selected display element. According to this display panel unevenness correction method, when the compensation image data of the selected display element is generated, the compensation image data of the non-selected display element is generated using the compensation image data of the selected display element. This makes it easier to calculate the compensation image data than in the case where the accumulated charge amount is calculated for the non-selected display element and the compensation image data of the non-selected display element is generated from the accumulated charge amount.
　本発明は、上記の表示パネルのムラ補正方法を実現する駆動回路にも具現化される。本発明は、所定のセル厚を有する表示パネルを表示させる表示パネルの駆動回路であって、前記表示パネルに基準データを印加して当該表示パネルを表示させる表示回路と、前記基準データが印加される際に前記表示パネルに供給される電流を積算して積算電荷量を算出する算出回路と、前記積算電荷量を前記基準データに対応して設定された基準電荷量と比較して前記表示パネルのセル厚の変動を補償する補償画像データを生成する補償回路と、を含むことを特徴とする。この駆動回路によれば、当該駆動回路を用いて表示パネルを表示する際に、表示パネルのセル厚の変動に対応した補償画像データを用いて表示パネルを表示することで、表示パネルの表示特性を高く維持することができる。 The present invention is also embodied in a drive circuit that realizes the display panel unevenness correction method. The present invention is a display panel driving circuit for displaying a display panel having a predetermined cell thickness, the display circuit applying a reference data to the display panel to display the display panel, and the reference data being applied. And calculating a cumulative charge amount by integrating the current supplied to the display panel, and comparing the cumulative charge amount with a reference charge amount set corresponding to the reference data. And a compensation circuit for generating compensation image data that compensates for variations in cell thickness. According to this drive circuit, when the display panel is displayed using the drive circuit, the display panel is displayed using the compensation image data corresponding to the variation in the cell thickness of the display panel, thereby displaying the display characteristics of the display panel. Can be kept high.
　また、本発明は、上記の駆動回路と、当該駆動回路で補償された補償画像データに基づいて表示を行う前記表示パネルと、を備える表示装置にも具現化される。この表示装置によれば、表示パネルのセル厚の変動に対応した補償画像データを用いて表示パネルを表示することで、表示装置の表示特性を高く維持することができる。 The present invention is also embodied in a display device that includes the above drive circuit and the display panel that performs display based on compensated image data compensated by the drive circuit. According to this display device, the display characteristics of the display device can be maintained high by displaying the display panel using the compensation image data corresponding to the variation in the cell thickness of the display panel.
　前記表示パネルが液晶を用いた液晶表示パネルであることが好ましい。この表示装置によれば、液晶表示パネルを用いた液晶表示装置において、液晶表示パネルのセル厚の変動に対応した補償画像データを用いて液晶表示パネルを表示することで、液晶表示装置の表示特性を高く維持することができる。 It is preferable that the display panel is a liquid crystal display panel using liquid crystal. According to the display device, in the liquid crystal display device using the liquid crystal display panel, the display characteristics of the liquid crystal display device are displayed by displaying the liquid crystal display panel using the compensation image data corresponding to the cell thickness variation of the liquid crystal display panel. Can be kept high.
（発明の効果）
　本発明によれば、セル厚の変動に起因した表示ムラを補正することができる。 (The invention's effect)
According to the present invention, display unevenness due to cell thickness variation can be corrected.
表示装置１０の概略的な構成を示す図The figure which shows schematic structure of the display apparatus 10. 絵素４２の等価回路を示す図The figure which shows the equivalent circuit of the pixel 42 ソースドライバ２８の概略的な回路構成を示す図The figure which shows schematic circuit structure of the source driver 28 液晶パネル２０のセル厚Ｌを示す図The figure which shows the cell thickness L of the liquid crystal panel 20 画像データ補正処理を示すフローチャートFlow chart showing image data correction processing 液晶パネル２０の表示領域２２の概略的な正面図Schematic front view of the display area 22 of the liquid crystal panel 20 液晶パネル２０のセル厚Ｌを示すグラフA graph showing the cell thickness L of the liquid crystal panel 20 液晶パネル２０の表示領域２２の概略的な正面図Schematic front view of the display area 22 of the liquid crystal panel 20 実施形態４の画像データ補正処理を説明する図FIG. 10 is a diagram for explaining image data correction processing according to the fourth embodiment.
　＜実施形態１＞
　本発明の実施形態１を、図面を参照して説明する。
１．表示装置の構成
　図１に示すように、表示装置１０は、制御回路１２と表示部１４とバックライト制御回路１６とを含む。表示部１４は、液晶パネル２０とバックライトユニット３０を含んで構成されている。 <Embodiment 1>
Embodiment 1 of the present invention will be described with reference to the drawings.
1. Configuration of Display Device As shown in FIG. 1, the display device 10 includes a control circuit 12, a display unit 14, and a backlight control circuit 16. The display unit 14 includes a liquid crystal panel 20 and a backlight unit 30.
　制御回路１２は、外部装置（図示されていない）から供給される入力画像に基づいて液晶パネル２０にデジタル信号であるゲート信号、データ信号を入力する他、電圧生成部１３を有しており、液晶パネル２０にアナログ基準電圧ＶＨ、ＶＬ及びコモン電圧を入力し、液晶パネル２０を駆動する。バックライト制御回路１６は、バックライトユニット３０を駆動する。バックライト制御回路１６は、制御回路１２と連動してバックライトユニット３０を駆動しても良ければ、制御回路１２と独立してバックライトユニット３０を駆動しても良い。 The control circuit 12 includes a voltage generation unit 13 in addition to inputting a gate signal and a data signal, which are digital signals, to the liquid crystal panel 20 based on an input image supplied from an external device (not shown). Analog reference voltages VH and VL and a common voltage are input to the liquid crystal panel 20 to drive the liquid crystal panel 20. The backlight control circuit 16 drives the backlight unit 30. The backlight control circuit 16 may drive the backlight unit 30 independently of the control circuit 12 if the backlight unit 30 may be driven in conjunction with the control circuit 12.
　バックライトユニット３０は、液晶パネル２０の背面に配置されている。バックライトユニット３０は、拡散板３２と、光源であるＬＥＤ３４（Light Emitting Diode：発光ダイオード）を備えている。ＬＥＤ３４は、拡散板３２の背面に対向して配置されている。拡散板３２は、その主面が液晶パネル２０に対向して配置されている。拡散板３２では、ＬＥＤ３４からの光が背面から入射され、その入射された光が拡散を伴って透過し、該拡散した光を液晶パネル２０に対向する主面から当該液晶パネル２０に照射している。バックライトユニット３０は、その奥行側の背面部にＬＥＤ３４が配置され、その前面に拡散板３２を配してなる、いわゆる直下型とされている。 The backlight unit 30 is disposed on the back surface of the liquid crystal panel 20. The backlight unit 30 includes a diffusion plate 32 and an LED 34 (Light Emitting Diode: light emitting diode) that is a light source. The LED 34 is disposed to face the back surface of the diffusion plate 32. The main surface of the diffusion plate 32 is disposed to face the liquid crystal panel 20. In the diffusing plate 32, the light from the LED 34 is incident from the back side, the incident light is transmitted with diffusion, and the diffused light is irradiated to the liquid crystal panel 20 from the main surface facing the liquid crystal panel 20. Yes. The backlight unit 30 is a so-called direct type in which the LEDs 34 are disposed on the back side on the depth side and a diffusion plate 32 is disposed on the front surface.
　液晶パネル２０には、複数の絵素４２が設けられた表示領域２２の周辺に額縁領域２４が広がっている。図２に、絵素４２の等価回路を示す。液晶パネル２０は、対向して配置される２枚のガラス基板４０Ａ、４０Ｂを含んで構成されている。図２に実線で示すガラス基板４０Ａには、複数の絵素４２の間に沿って伸びる複数のゲートライン４４及び複数のデータライン４６が設けられており、スイッチ装置４８とピクセル電極５０を含む。ゲートライン４４とデータライン４６は、互いに直交する方向に伸びている。 In the liquid crystal panel 20, a frame area 24 extends around a display area 22 provided with a plurality of picture elements 42. FIG. 2 shows an equivalent circuit of the picture element 42. The liquid crystal panel 20 includes two glass substrates 40A and 40B arranged to face each other. A glass substrate 40A indicated by a solid line in FIG. 2 is provided with a plurality of gate lines 44 and a plurality of data lines 46 extending between the plurality of picture elements 42, and includes a switch device 48 and a pixel electrode 50. The gate line 44 and the data line 46 extend in directions orthogonal to each other.
　スイッチ装置４８には、スイッチ電極４８Ａとデータ電極４８Ｂ、４８Ｃが設けられている。スイッチ電極４８Ａは対応するゲートライン４４に接続されている。一方のデータ電極４８Ｂは、対応するデータライン４６に接続されている。他方のデータ電極４８Ｃは、ピクセル電極５０に接続されている。 The switch device 48 is provided with a switch electrode 48A and data electrodes 48B and 48C. The switch electrode 48A is connected to the corresponding gate line 44. One data electrode 48 </ b> B is connected to the corresponding data line 46. The other data electrode 48 </ b> C is connected to the pixel electrode 50.
　図２に点線で示すガラス基板４０Ｂには、対向電極５２が設けられており、対向電極５２には、制御回路１２からコモン電圧が印加されている。対向電極５２は、各絵素４２において、ガラス基板４０Ａ、４０Ｂの間に封入された液晶分子を介してピクセル電極５０に対向配置されている。ピクセル電極５０と対向電極５２は、ガラス基板４０Ａ、４０Ｂの間の距離を示すセル厚Ｌだけ離反して配置されている。 2 is provided with a counter electrode 52, and a common voltage is applied from the control circuit 12 to the counter electrode 52. In each picture element 42, the counter electrode 52 is disposed to face the pixel electrode 50 through liquid crystal molecules sealed between the glass substrates 40 </ b> A and 40 </ b> B. The pixel electrode 50 and the counter electrode 52 are spaced apart by a cell thickness L indicating the distance between the glass substrates 40A and 40B.
　図１に示すように、液晶パネル２０の額縁領域２４には、ゲートドライバ２６とソースドライバ（駆動回路の一例）２８が実装されている。ゲートドライバ２６は、制御回路１２から入力されるゲート信号及びアナログ基準電圧ＶＨ、ＶＬを用いて、絵素４２のスイッチ装置４８のオン／オフを切り替えるゲート電圧を生成し、ゲートライン４４を介して各絵素４２のスイッチ電極４８Ａに印加する。 As shown in FIG. 1, a gate driver 26 and a source driver (an example of a drive circuit) 28 are mounted on the frame region 24 of the liquid crystal panel 20. The gate driver 26 uses the gate signal and analog reference voltages VH and VL input from the control circuit 12 to generate a gate voltage for switching on / off the switch device 48 of the pixel 42, and passes through the gate line 44. The voltage is applied to the switch electrode 48A of each picture element 42.
　ソースドライバ２８は、制御回路１２から入力されるデータ信号及びアナログ基準電圧ＶＨ、ＶＬを用いて絵素４２のピクセル電極５０に印加する画像データＶを生成し、データライン４６を介して各絵素４２のピクセル電極５０に印加する。 The source driver 28 generates image data V to be applied to the pixel electrode 50 of the picture element 42 using the data signal input from the control circuit 12 and the analog reference voltages VH and VL, and each picture element via the data line 46. 42 pixel electrodes 50 are applied.
　図３にソースドライバ２８の回路構成を示す。ソースドライバ２８は、画像データ生成回路（表示回路の一例）６０と、電流検出回路（算出回路の一例）６２と、電荷量比較回路（補償回路の一例）６４と、画像データ補正回路（補償回路の一例）６６と、を含む。 FIG. 3 shows the circuit configuration of the source driver 28. The source driver 28 includes an image data generation circuit (an example of a display circuit) 60, a current detection circuit (an example of a calculation circuit) 62, a charge amount comparison circuit (an example of a compensation circuit) 64, and an image data correction circuit (a compensation circuit). Example 66).
　画像データ生成回路６０は、制御回路１２からデータ信号が入力されているとともに画像データ補正回路６６から表示画像データＤが入力されており、入力されたデータ信号と表示画像データＤから画像データＶを生成し、データライン４６に画像データＶを印加する。この際、画像データ生成回路６０は、データライン４６に電流を供給し、各絵素４２のピクセル電極５０に画像データＶを発生させるのに必要な電荷量を供給する。 The image data generation circuit 60 receives the data signal from the control circuit 12 and the display image data D from the image data correction circuit 66, and obtains the image data V from the input data signal and the display image data D. The image data V is generated and applied to the data line 46. At this time, the image data generation circuit 60 supplies a current to the data line 46 and supplies a charge amount necessary for generating the image data V to the pixel electrode 50 of each pixel 42.
　電流検出回路６２は、データライン４６に流れる電流を検出し、検出した電流値を電荷量比較回路６４に入力する。電荷量比較回路６４は、電流検出回路６２から入力される電流値から、画像データ生成回路６０が各絵素４２のピクセル電極５０に画像データＶを印加する際にデータライン４６に供給した電流を積算して積算電荷量を算出する。また、電荷量比較回路６４には、予め基準電荷量が記憶されており、算出したその比較結果を画像データ補正回路６６に入力する。 The current detection circuit 62 detects the current flowing through the data line 46 and inputs the detected current value to the charge amount comparison circuit 64. The charge amount comparison circuit 64 uses, based on the current value input from the current detection circuit 62, the current supplied to the data line 46 when the image data generation circuit 60 applies the image data V to the pixel electrode 50 of each pixel 42. Accumulated to calculate the accumulated charge amount. The charge amount comparison circuit 64 stores a reference charge amount in advance, and inputs the calculated comparison result to the image data correction circuit 66.
　画像データ補正回路６６は、制御回路１２からアナログ基準電圧ＶＨ、ＶＬが入力されており、入力されたアナログ基準電圧ＶＨ、ＶＬから表示画像データＤを生成し、画像データ生成回路６０に入力する。また、画像データ補正回路６６は、電荷量比較回路６４から比較結果を受け取ると、その比較結果に基づいて表示画像データＤを補正し、補償画像データＨを生成し、画像データ生成回路６０に入力する。画像データ生成回路６０は、表示画像データＤが入力された後に、あるいは表示画像データＤの代わりに補償画像データＨが入力されると、補償画像データＨを用いて画像データＶを生成する。 The image data correction circuit 66 receives the analog reference voltages VH and VL from the control circuit 12, generates display image data D from the input analog reference voltages VH and VL, and inputs the display image data D to the image data generation circuit 60. Further, when the image data correction circuit 66 receives the comparison result from the charge amount comparison circuit 64, the image data correction circuit 66 corrects the display image data D based on the comparison result, generates the compensation image data H, and inputs it to the image data generation circuit 60. To do. The image data generation circuit 60 generates the image data V using the compensation image data H after the display image data D is inputted or when the compensation image data H is inputted instead of the display image data D.
２．表示装置の制御
　制御回路１２は、表示部１４の液晶パネル２０を駆動する際、ゲートライン４４にゲート電圧を印加し、データライン４６に画像データＶを印加する。各絵素４２では、ゲート電圧のオン電圧の入力によってスイッチ装置４８がオンに切り替わっている間にスイッチ装置４８を介して各絵素４２に画像データＶを発生させるのに必要な電荷量がピクセル電極５０に供給される。これにより、絵素４２では、ピクセル電極５０に供給された電荷量により対向電極５２との間に画像データＶに相当する電圧が発生し、この電圧が液晶分子に印加され、液晶分子の偏向が変化する。これにより、絵素４２が所望の光透過率に設定され、当該絵素４２が表示状態となる。 2. Control of Display Device When the liquid crystal panel 20 of the display unit 14 is driven, the control circuit 12 applies a gate voltage to the gate line 44 and applies image data V to the data line 46. In each picture element 42, the amount of charge necessary to generate image data V in each picture element 42 through the switch device 48 while the switch device 48 is turned on by the input of the on voltage of the gate voltage is a pixel. Supplied to the electrode 50. As a result, in the pixel 42, a voltage corresponding to the image data V is generated between the pixel electrode 50 and the counter electrode 52 due to the amount of charge supplied to the pixel electrode 50, and this voltage is applied to the liquid crystal molecules, thereby deflecting the liquid crystal molecules. Change. As a result, the picture element 42 is set to a desired light transmittance, and the picture element 42 enters a display state.
　液晶パネル２０では、所望の光透過率を実現するために絵素４２のピクセル電極５０に供給する必要がある所望の電荷量Ｑが予め決定されている。この電荷量Ｑは、セル厚Ｌと画像データＶの他、液晶分子の誘電率ε、ピクセル電極５０の面積Ｓを用いて以下のように表される。
Ｑ＝Ｃ＊Ｖ＝（ε＊Ｓ／Ｌ）＊Ｖ In the liquid crystal panel 20, a desired charge amount Q that needs to be supplied to the pixel electrode 50 of the picture element 42 in order to achieve a desired light transmittance is determined in advance. This charge amount Q is expressed as follows using the cell thickness L and the image data V, the dielectric constant ε of the liquid crystal molecules, and the area S of the pixel electrode 50.
Q = C * V = (ε * S / L) * V
　液晶パネル２０では、液晶分子の誘電率εやピクセル電極５０の面積Ｓは、製造段階において厳格に管理されている一方、液晶パネル２０のセル厚Ｌは製造プロセスによるバラツキ等で変動することがある。図４に示すように、液晶パネル２０では、２枚のガラス基板４０Ａ、４０Ｂが張り合わされる際に、表示領域２２に隣接する額縁領域２４に基準幅Ｌ０を有するスペーサ５４が挿入されている。そのため、表示領域２２の端部では、セル厚Ｌが基準幅Ｌ０に設定されている。 In the liquid crystal panel 20, the dielectric constant ε of the liquid crystal molecules and the area S of the pixel electrode 50 are strictly controlled in the manufacturing stage, while the cell thickness L of the liquid crystal panel 20 may vary due to variations in the manufacturing process. . As shown in FIG. 4, in the liquid crystal panel 20, when the two glass substrates 40 </ b> A and 40 </ b> B are bonded together, a spacer 54 having a reference width L <b> 0 is inserted into the frame area 24 adjacent to the display area 22. Therefore, the cell thickness L is set to the reference width L0 at the end of the display area 22.
　その一方、表示領域２２の中央部では、スペーサ５４を挿入することが難しく、製造プロセスによるバラツキの他、ガラス基板の重さによる垂み等によって、セル厚Ｌが基準幅Ｌ０と異なる厚さＬ１となることがある。液晶パネル２０のセル厚Ｌが、基準幅Ｌ０と異なる厚さＬ１である場合、基準幅Ｌ０に基づいて設定されている表示画像データＤから生成された画像データＶを絵素４２のピクセル電極５０に印加しても、絵素４２のピクセル電極５０に所望の電荷量Ｑを供給することができない。そのため、絵素４２に所望の光透過率を実現することができず、表示ムラが発生してしまう。 On the other hand, it is difficult to insert the spacer 54 at the central portion of the display area 22, and the cell thickness L is different from the reference width L0 due to the variation due to the weight of the glass substrate in addition to the variation due to the manufacturing process. It may become. When the cell thickness L of the liquid crystal panel 20 is a thickness L1 different from the reference width L0, the image data V generated from the display image data D set based on the reference width L0 is used as the pixel electrode 50 of the picture element 42. The desired charge amount Q cannot be supplied to the pixel electrode 50 of the picture element 42 even if applied to. Therefore, a desired light transmittance cannot be realized in the picture element 42, and display unevenness occurs.
　この場合、ピクセル電極５０に所望の電荷量Ｑを供給するためには、セル厚Ｌの変動を画像データＶで補償する必要がある。本実施形態の表示装置１０では、液晶パネル２０のソースドライバ２８に含まれる画像データ生成回路６０等を用いて、画像データＶの補正処理を実行する。 In this case, in order to supply a desired amount of charge Q to the pixel electrode 50, it is necessary to compensate for variations in the cell thickness L with the image data V. In the display device 10 of the present embodiment, the correction processing of the image data V is executed using the image data generation circuit 60 included in the source driver 28 of the liquid crystal panel 20.
３．画像データ補正処理
　図５を用いて、画像データ補正処理を説明する。本実施形態において、画像データ補正処理は、液晶パネル２０の絵素４２毎に実行される。画像データ補正処理の開始に先立って、画像データ生成回路６０には画像データ補正回路６６から表示画像データＤが入力されている。表示画像データＤは、複数の画像データＤ０、Ｄ１・・・から構成されており、これらの画像データＤ０、Ｄ１・・・は、表示画像データＤのうち最も電圧値の高い基準画像データ（基準データ及び基準画像データの一例）Ｄ０を予め設定された抵抗群により抵抗分圧されて生成されている。ソースドライバ２８は、制御回路１２から画像データ補正処理の指示が入力されると処理を開始し、対象の絵素４２に基準画像データＤ０を印加する（Ｓ２）。 3. Image Data Correction Processing Image data correction processing will be described with reference to FIG. In the present embodiment, the image data correction process is executed for each picture element 42 of the liquid crystal panel 20. Prior to the start of the image data correction process, display image data D is input from the image data correction circuit 66 to the image data generation circuit 60. The display image data D is composed of a plurality of image data D0, D1,..., And these image data D0, D1,. An example of data and reference image data) D0 is generated by resistance voltage division by a preset resistance group. The source driver 28 starts processing upon receiving an image data correction processing instruction from the control circuit 12, and applies the reference image data D0 to the target pixel 42 (S2).
　電流検出回路６２は、対象の絵素４２に接続されるデータライン４６に流れる電流を検出し（Ｓ４）、電荷量比較回路６４に入力する。電荷量比較回路６４は、電流検出回路６２が検出した電流値から、対象の絵素４２に基準画像データＤ０を印加する際に当該データライン４６に供給された積算電荷量Ｑ１を算出する（Ｓ６）。電荷量比較回路６４には、基準画像データＤ０に対応した基準電荷量Ｑ０が予め設定されており、電荷量比較回路６４は、算出した積算電荷量Ｑ１と基準電荷量Ｑ０から比較結果Ｆを算出し（Ｓ８）、画像データ補正回路６６に入力する。
Ｑ０＝（ε＊Ｓ／Ｌ０）＊Ｄ０、Ｑ１＝（ε＊Ｓ／Ｌ１）＊Ｄ０、Ｆ＝Ｑ１／Ｑ０ The current detection circuit 62 detects the current flowing through the data line 46 connected to the target pixel 42 (S4) and inputs it to the charge amount comparison circuit 64. The charge amount comparison circuit 64 calculates the integrated charge amount Q1 supplied to the data line 46 when applying the reference image data D0 to the target pixel 42 from the current value detected by the current detection circuit 62 (S6). ). A reference charge amount Q0 corresponding to the reference image data D0 is preset in the charge amount comparison circuit 64, and the charge amount comparison circuit 64 calculates a comparison result F from the calculated integrated charge amount Q1 and the reference charge amount Q0. (S8) and input to the image data correction circuit 66.
Q0 = (ε * S / L0) * D0, Q1 = (ε * S / L1) * D0, F = Q1 / Q0
　画像データ補正回路６６は、比較結果Ｆを用いて表示画像データＤを補正し、補償画像データＨを生成する。具体的には、画像データ補正回路６６は、基準画像データＤ０を比較結果Ｆで除して基準補償画像データＨ０を生成する。画像データ補正回路６６は、表示画像データＤと同一の抵抗群を用いて基準補償画像データＨ０を抵抗分圧し、補償画像データＨを構成する複数の画像データＨ０、Ｈ１・・・を生成する。
Ｈ０＝Ｄ０／Ｆ The image data correction circuit 66 corrects the display image data D using the comparison result F, and generates compensated image data H. Specifically, the image data correction circuit 66 generates the reference compensated image data H0 by dividing the reference image data D0 by the comparison result F. The image data correction circuit 66 divides the reference compensation image data H0 by resistance using the same resistance group as the display image data D, and generates a plurality of image data H0, H1,... Constituting the compensation image data H.
H0 = D0 / F
　画像データ補正回路６６は、生成した補償画像データＨを画像データ生成回路６０に入力する（Ｓ１２）。画像データ生成回路６０は、画像データ補正回路６６から補償画像データＨが入力されると、予め入力されている表示画像データＤに代わって補償画像データＨを用いて画像データＶを生成する。つまり、本実施形態では、セル厚Ｌの変動に起因して発生した基準電荷量Ｑ０から積算電荷量Ｑ１への電荷量の変動を、表示画像データＤを補償画像データＨへと補正することで補償している。
Ｑ０＝（ε＊Ｓ／Ｌ０）＊Ｄ０＝（ε＊Ｓ／Ｌ１）＊Ｈ０ The image data correction circuit 66 inputs the generated compensated image data H to the image data generation circuit 60 (S12). When the compensation image data H is input from the image data correction circuit 66, the image data generation circuit 60 generates the image data V using the compensation image data H in place of the display image data D input in advance. That is, in the present embodiment, the variation in the charge amount from the reference charge amount Q0 to the accumulated charge amount Q1 caused by the variation in the cell thickness L is corrected by changing the display image data D to the compensation image data H. Compensation.
Q0 = (ε * S / L0) * D0 = (ε * S / L1) * H0
４．画像データ補正処理の効果
（１）本実施形態の画像データ補正処理では、製造プロセスによるバラツキ等で液晶パネル２０のセル厚Ｌが基準幅Ｌ０から変動した場合に、画像データＶを生成する基準となる表示画像データＤを補償画像データＨに補正することで、セル厚Ｌの変動を補償している。この画像データ補正処理によれば、液晶パネル２０に含まれる各絵素４２のピクセル電極５０に供給される電荷量Ｑを所望の値とすることができ、液晶パネル２０に発生する表示ムラが抑制され、液晶パネル２０の表示特性を高く維持することができる。 4). Effects of Image Data Correction Process (1) In the image data correction process of the present embodiment, when the cell thickness L of the liquid crystal panel 20 varies from the reference width L0 due to variations due to manufacturing processes, the reference for generating the image data V By correcting the display image data D to be compensated image data H, variations in the cell thickness L are compensated. According to this image data correction process, the charge amount Q supplied to the pixel electrode 50 of each picture element 42 included in the liquid crystal panel 20 can be set to a desired value, and display unevenness generated in the liquid crystal panel 20 is suppressed. Thus, the display characteristics of the liquid crystal panel 20 can be maintained high.
（２）本実施形態の画像データ補正処理では、基準画像データＤ０を補正して基準補償画像データＨ０を生成し、基準補償画像データＨ０を用いて補償画像データＨを生成する。この画像データ補正処理では、基準補償画像データＨ０を生成しておくことで、基準画像データＤ０から表示画像データＤを生成するのに用いた抵抗群を用いて基準補償画像データＨ０から補償画像データＨを生成することができ、補償画像データＨを容易に生成することができる。 (2) In the image data correction process of this embodiment, the reference image data D0 is corrected to generate the reference compensation image data H0, and the compensation image data H is generated using the reference compensation image data H0. In this image data correction processing, by generating the reference compensation image data H0, the compensation image data is generated from the reference compensation image data H0 using the resistance group used to generate the display image data D from the reference image data D0. H can be generated, and the compensation image data H can be easily generated.
　＜実施形態２＞
　本発明の実施形態２を図６を用いて説明する。本実施形態の表示装置１０は、画像データ補正処理において、液晶パネル２０に含まれる全ての絵素４２に対して積算電荷量Ｑ１を算出しない点で、実施形態１の表示装置１０と異なる。 <Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. The display device 10 of the present embodiment is different from the display device 10 of the first embodiment in that the integrated charge amount Q1 is not calculated for all the picture elements 42 included in the liquid crystal panel 20 in the image data correction process.
　液晶パネル２０のセル厚Ｌが変動する場合、表示領域２２の中央部を境界として、液晶パネル２０の左右及び上下方向にセル厚Ｌが対称に変動することがある。また、液晶パネル２０のセル厚Ｌが変動する場合、表示領域２２の端部から中央部にかけてセル厚Ｌが直線的に変動することがある。本実施形態では、表示領域２２の端部から中央部にかけて液晶パネル２０のセル厚Ｌが直線的に変動している場合に、直線的に変動していることを利用して補償画像データＨを算出する。 When the cell thickness L of the liquid crystal panel 20 varies, the cell thickness L may vary symmetrically in the left and right and up and down directions of the liquid crystal panel 20 with the central portion of the display region 22 as a boundary. Further, when the cell thickness L of the liquid crystal panel 20 varies, the cell thickness L may vary linearly from the end to the center of the display region 22. In the present embodiment, when the cell thickness L of the liquid crystal panel 20 varies linearly from the end to the center of the display area 22, the compensation image data H is obtained using the fact that the cell thickness L varies linearly. calculate.
１．画像データ補正処理
　図６に示すように、本実施形態では、液晶パネル２０の中央部の点Ａにおける絵素４２Ａにおける補償画像データＨＡと、液晶パネル２０の端部の点Ｂにおける絵素４２Ｂにおける補償画像データＨＢとが、実施形態１と同一の方法により生成されている。本実施形態では、この補償画像データＨＡと補償画像データＨＢを用いて、線分ＡＢにおける点Ｃにおける補償画像データＨＣを生成する。ここで、点Ａと点Ｃの間の距離をＷ（ＡＣ）とする。また、点Ｂと点Ｃの間の距離をＷ（ＢＣ）とする。この際、点Ｃにおける補償画像データＨＣは、以下のように算出することができる。
ＨＣ＝（Ｗ（ＡＣ）＊ＨＢ＋Ｗ（ＢＣ）＊ＨＡ）／（Ｗ（ＡＣ）＋Ｗ（ＢＣ）） 1. Image Data Correction Processing As shown in FIG. 6, in the present embodiment, the compensation image data HA at the picture element 42 </ b> A at the center point A of the liquid crystal panel 20 and the picture element 42 </ b> B at the end point B of the liquid crystal panel 20. The compensation image data HB is generated by the same method as in the first embodiment. In the present embodiment, the compensation image data HC at the point C in the line segment AB is generated using the compensation image data HA and the compensation image data HB. Here, the distance between point A and point C is W (AC). The distance between point B and point C is W (BC). At this time, the compensation image data HC at the point C can be calculated as follows.
HC = (W (AC) * HB + W (BC) * HA) / (W (AC) + W (BC))
２．画像データ補正処理の効果
（１）本実施形態の画像データ補正処理では、液晶パネル２０のセル厚Ｌが、表示領域２２の端部から中央部にかけて直線的に変動することを利用して、点Ａにおける補償画像データＨＡと点Ｂにおける補償画像データＨＢから、点Ａと点Ｂの中間の点Ｃにおける補償画像データＨＣを生成する。これにより、補償画像データＨＣを算出する際に、点Ｃの絵素４２に対して積算電荷量Ｑ１を算出する必要がなく、補償画像データＨＣを容易に生成することができる。 2. Effect of Image Data Correction Process (1) In the image data correction process of the present embodiment, the fact that the cell thickness L of the liquid crystal panel 20 fluctuates linearly from the end to the center of the display region 22 is From the compensated image data HA at A and the compensated image data HB at point B, the compensated image data HC at point C intermediate between point A and point B is generated. Thereby, when calculating the compensation image data HC, it is not necessary to calculate the accumulated charge amount Q1 for the pixel 42 at the point C, and the compensation image data HC can be easily generated.
（２）液晶パネル２０では、液晶パネル２０の端部におけるセル厚Ｌがスペーサによって等しい値に保たれていることから、補償画像データＨＢは液晶パネル２０の全周において等しい。そのため、補償画像データＨＡと補償画像データＨＢを用いることで、液晶パネル２０の全ての絵素４２に対して補償画像データＨを生成することができる。 (2) In the liquid crystal panel 20, since the cell thickness L at the end of the liquid crystal panel 20 is kept equal by the spacer, the compensation image data HB is the same over the entire circumference of the liquid crystal panel 20. Therefore, the compensation image data H can be generated for all the picture elements 42 of the liquid crystal panel 20 by using the compensation image data HA and the compensation image data HB.
（３）さらに、液晶パネル２０の端部におけるセル厚Ｌが基準幅Ｌ０に設定されている場合には、補償画像データＨＢは表示画像データＤに等しいことから、補償画像データＨＢを求める必要もない。 (3) Further, when the cell thickness L at the end of the liquid crystal panel 20 is set to the reference width L0, the compensated image data HB is equal to the display image data D, and therefore it is necessary to obtain the compensated image data HB. Absent.
　＜実施形態３＞
　本発明の実施形態３を図７を用いて説明する。本実施形態の表示装置１０は、液晶パネル２０のセル厚Ｌが、表示領域２２の端部から中央部にかけて直線的でなく、規定曲線Ｚに沿って変動している点で、実施形態２の表示装置１０と異なる。 <Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. The display device 10 of the present embodiment is different from that of the second embodiment in that the cell thickness L of the liquid crystal panel 20 is not linear from the end to the center of the display region 22 but varies along the prescribed curve Z. Different from the display device 10.
１．画像データ補正処理
　液晶パネル２０では、ガラス基板４０Ａ、４０Ｂの重さによる垂み等によって、液晶パネル２０が一定の懸垂曲線に沿って変形することがあり、それに伴って、図７に示すように、液晶パネル２０のセル厚Ｌが一定の規定曲線Ｚに沿って変動することがある。本実施形態では、ソースドライバ２８に当該規定曲線Ｚが記憶されており、具体的には、液晶パネル２０の絵素４２毎に規定曲線Ｚを示すデータが記憶されている。本実施形態では、この規定曲線Ｚと補償画像データＨＡと補償画像データＨＢを用いて線分ＡＢ上の点Ｃにおける補償画像データＨＣを算出する。 1. Image Data Correction Processing In the liquid crystal panel 20, the liquid crystal panel 20 may be deformed along a certain suspension curve due to drooping due to the weight of the glass substrates 40A and 40B, and as shown in FIG. The cell thickness L of the liquid crystal panel 20 may fluctuate along a certain prescribed curve Z. In the present embodiment, the specified curve Z is stored in the source driver 28, and specifically, data indicating the specified curve Z is stored for each pixel 42 of the liquid crystal panel 20. In the present embodiment, the compensation image data HC at the point C on the line segment AB is calculated using the prescribed curve Z, the compensation image data HA, and the compensation image data HB.
２．画像データ補正処理の効果
　本実施形態の画像データ補正処理では、液晶パネル２０のセル厚Ｌが、一定の規定曲線Ｚに沿って変動することを利用して、規定曲線Ｚと補償画像データＨＡと補償画像データＨＢから線分ＡＢ上の点Ｃにおける補償画像データＨＣを生成する。これにより、補償画像データＨＣを算出する際に、点Ｃの絵素４２に対して積算電荷量Ｑ１を算出する必要がなく、補償画像データＨＣを容易に生成することができる。 2. Effects of Image Data Correction Processing In the image data correction processing of the present embodiment, the prescribed curve Z, the compensation image data HA, and Compensation image data HC at point C on line segment AB is generated from compensation image data HB. Thereby, when calculating the compensation image data HC, it is not necessary to calculate the accumulated charge amount Q1 for the pixel 42 at the point C, and the compensation image data HC can be easily generated.
　＜実施形態４＞
　本発明の実施形態４を図８を用いて説明する。本実施形態の表示装置１０では、画像データ補正処理において、液晶パネル２０のゲートライン４４に沿った第１方向ＤＬ１と、データライン４６に沿った第２方向ＤＬ２に規定距離Ｋ毎に選択絵素４２Ｓが指定されている。この表示装置１０では、当該選択絵素４２Ｓに対してのみ積算電荷量Ｑ１を算出し、他の絵素４２である非選択絵素４２Ｎに対して積算電荷量Ｑ１を算出しない点で、実施形態１の表示装置１０と異なる。 <Embodiment 4>
Embodiment 4 of the present invention will be described with reference to FIG. In the display device 10 of the present embodiment, in the image data correction process, the selected picture element is selected for each specified distance K in the first direction DL1 along the gate line 44 of the liquid crystal panel 20 and in the second direction DL2 along the data line 46. 42S is designated. In the display device 10, the integrated charge amount Q1 is calculated only for the selected picture element 42S, and the integrated charge amount Q1 is not calculated for the non-selected picture element 42N that is another picture element 42. 1 different from the display device 10 of FIG.
　液晶パネル２０のセル厚Ｌが変動する場合、液晶パネル２０の一部に局所的なセル厚Ｌの変動が生じることがあり、液晶パネル２０の左右及び上下方向にセル厚Ｌが対称に変動しないことがある。本実施形態では、規定距離Ｋ毎に指定された選択絵素４２Ｓの補償画像データＨＳを用いることで、局所的に液晶パネル２０のセル厚Ｌが変動した場合でも、適切な補償画像データＨを生成する。 When the cell thickness L of the liquid crystal panel 20 varies, a local variation of the cell thickness L may occur in a part of the liquid crystal panel 20, and the cell thickness L does not vary symmetrically in the left-right and vertical directions of the liquid crystal panel 20. Sometimes. In the present embodiment, by using the compensation image data HS of the selected picture element 42S designated for each specified distance K, appropriate compensation image data H can be obtained even when the cell thickness L of the liquid crystal panel 20 varies locally. Generate.
１．画像データ補正処理
　図８に示すように、本実施形態では、液晶パネル２０の選択絵素４２Ｓにおける補償画像データＨＳが、実施形態１と同一の方法により求められている。本実施形態では、非選択絵素４２Ｎの補償画像データＨＮを算出する際に、図９に示すように、当該非選択絵素４２Ｎに近接する選択絵素４２Ｓ（図９では、４つの選択絵素４２Ｓ）を選出し、この選択絵素４２Ｓの補償画像データＨＳを用いて当該非選択絵素４２Ｎの補償画像データＨＮを算出する。 1. Image Data Correction Processing As shown in FIG. 8, in this embodiment, the compensated image data HS in the selected picture element 42S of the liquid crystal panel 20 is obtained by the same method as in the first embodiment. In the present embodiment, when calculating the compensation image data HN of the non-selected picture element 42N, as shown in FIG. 9, the selected picture element 42S adjacent to the non-selected picture element 42N (in FIG. 9, four selected pictures). Element 42S) is selected, and the compensation image data HN of the non-selected picture element 42N is calculated using the compensation picture data HS of the selected picture element 42S.
２．画像データ補正処理の効果
　本実施形態の画像データ補正処理では、選択絵素４２Ｓにおける補償画像データＨＳから、非選択絵素４２Ｎの補償画像データＨＮを算出する。液晶パネル２０のセル厚Ｌが局所的に変動する場合であっても、液晶パネル２０の各部分について考えると、セル厚Ｌは連続的に変動している。そのため、液晶パネル２０の第１方向ＤＬ１と第２方向ＤＬ２に規定距離Ｋ毎に選択絵素４２Ｓが配置されている場合、非選択絵素４２Ｎのセル厚は、隣接する選択絵素４２Ｓのセル厚Ｌに近似した値となる。そのため、非選択絵素４２Ｎの補償画像データＨＮは、選択絵素４２Ｓの補償画像データＨＳに近似した値となる。これにより、補償画像データＨＮを算出する際に、非選択絵素４２Ｎに対して積算電荷量Ｑ１を算出する必要がなく、補償画像データＨＮを容易に算出することができる。 2. Effect of Image Data Correction Process In the image data correction process of the present embodiment, the compensation image data HN of the non-selected picture element 42N is calculated from the compensation image data HS of the selected picture element 42S. Even when the cell thickness L of the liquid crystal panel 20 varies locally, the cell thickness L varies continuously when considering each part of the liquid crystal panel 20. Therefore, when the selected picture element 42S is arranged at the specified distance K in the first direction DL1 and the second direction DL2 of the liquid crystal panel 20, the cell thickness of the non-selected picture element 42N is the cell of the adjacent selected picture element 42S. The value approximates the thickness L. Therefore, the compensation image data HN of the non-selected picture element 42N becomes a value approximate to the compensation image data HS of the selected picture element 42S. Thereby, when calculating the compensation image data HN, it is not necessary to calculate the accumulated charge amount Q1 for the non-selected picture element 42N, and the compensation image data HN can be easily calculated.
　＜他の実施形態＞
　本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
（１）上記実施形態では、制御回路１２からの指示に従って画像データ補正処理を実行する例を示したが、本発明の実施形態はこれに限られない。例えば、表示装置１０の一定使用期間毎に画像データ補正処理を実行してもよい。これにより、製造プロセスによるバラツキによるセル厚Ｌの変動だけでなく、経年劣化によるセル厚Ｌの変動に起因した表示ムラの発生を抑制することができ、液晶パネル２０の表示特性を高く維持することができる。 (1) In the above embodiment, an example in which image data correction processing is executed in accordance with an instruction from the control circuit 12 has been shown, but the embodiment of the present invention is not limited to this. For example, the image data correction process may be executed every fixed usage period of the display device 10. As a result, not only the variation of the cell thickness L due to variations due to the manufacturing process but also the occurrence of display unevenness due to the variation of the cell thickness L due to deterioration over time can be suppressed, and the display characteristics of the liquid crystal panel 20 can be maintained high. Can do.
（２）上記実施形態では、光源としてＬＥＤを用いたものを例示したが、ＬＥＤ以外の光源を用いたものであってもよい。 (2) In the above embodiment, the light source using the LED as the light source is exemplified, but a light source other than the LED may be used.
１０：表示装置、１４：表示部、２０：液晶パネル、２６ゲートドライバ、２８：ソースドライバ、４０Ａ、４０Ｂ：ガラス基板、４２：絵素、４４：ゲートライン、４６：データライン、４８：スイッチ装置、５０：ピクセル電極、５２：対向電極、５４：スペーサ、６０：画像データ生成回路、６２：電流検出回路、６４：電荷量比較回路、６６：画像データ補正回路、Ｄ：表示画像データ、Ｄ０：基準画像データ、Ｈ：補償画像データ、Ｈ０：基準補償画像データ、Ｌ：セル厚、Ｖ：画像データ、Ｑ：電荷量、Ｑ０：基準電荷量、Ｑ１：積算電荷量、ＤＬ１：第１方向、ＤＬ２：第２方向 10: display device, 14: display unit, 20: liquid crystal panel, 26 gate driver, 28: source driver, 40A, 40B: glass substrate, 42: picture element, 44: gate line, 46: data line, 48: switch device 50: pixel electrode, 52: counter electrode, 54: spacer, 60: image data generation circuit, 62: current detection circuit, 64: charge amount comparison circuit, 66: image data correction circuit, D: display image data, D0: Reference image data, H: Compensation image data, H0: Reference compensation image data, L: Cell thickness, V: Image data, Q: Charge amount, Q0: Reference charge amount, Q1: Accumulated charge amount, DL1: First direction, DL2: Second direction

Claims (12)

  1. 　所定のセル厚を有する表示パネルの表示ムラを補正する表示パネルのムラ補正方法であって、
    　前記表示パネルに基準データを印加して前記表示パネルを表示させる表示工程と、
    　前記表示工程において前記基準データが印加される際に前記表示パネルに供給される電流を積算して積算電荷量を算出する算出工程と、
    　前記積算電荷量を前記基準データに対応して設定された基準電荷量と比較して前記表示パネルのセル厚の変動を補償する補償画像データを生成する補償工程と、を含むことを特徴とする表示パネルのムラ補正方法。     A display panel unevenness correction method for correcting display unevenness of a display panel having a predetermined cell thickness,
    Displaying the display panel by applying reference data to the display panel; and
    A calculation step of calculating an integrated charge amount by integrating a current supplied to the display panel when the reference data is applied in the display step;
    A compensation step of comparing the accumulated charge amount with a reference charge amount set corresponding to the reference data and generating compensation image data for compensating for a variation in cell thickness of the display panel. Display panel unevenness correction method.
  2. 　前記表示パネルには、前記基準データに対応した表示画像データが設定されており、
    　前記補償工程では、前記基準電荷量に対する前記積算電荷量の比を示す比較結果を算出し、前記表示画像データを前記比較結果で除して前記補償画像データを生成することを特徴とする請求項１に記載の表示パネルのムラ補正方法。     Display image data corresponding to the reference data is set in the display panel,
    2. The compensation step of calculating a comparison result indicating a ratio of the accumulated charge amount to the reference charge amount and dividing the display image data by the comparison result to generate the compensation image data. The display panel unevenness correction method according to 1.
  3. 　前記表示画像データには、基準画像データが含まれ、前記基準画像データから前記表示画像データが設定されており、
    　前記基準データは、前記基準画像データに等しいことを特徴とする請求項２に記載の表示パネルのムラ補正方法。     The display image data includes reference image data, and the display image data is set from the reference image data,
    The display panel unevenness correction method according to claim 2, wherein the reference data is equal to the reference image data.
  4. 　前記表示パネルには、複数の表示素子が含まれており、前記補償画像データは前記表示素子毎に生成されることを特徴とする請求項１ないし請求項３に記載の表示パネルのムラ補正方法。 The display panel unevenness correction method according to claim 1, wherein the display panel includes a plurality of display elements, and the compensation image data is generated for each display element. .
  5. 　前記表示パネルには、前記表示パネルの中央部に配置された第１表示素子と、前記表示パネルの端部に配置された第２表示素子と、が配置されており、
    　前記算出工程では、前記第１表示素子における第１積算電荷量と、前記第２表示素子における第２積算電荷量と、を算出し、
    　前記補償工程では、前記第１積算電荷量を用いて第１表示素子における第１補償画像データを生成するとともに、前記第２積算電荷量を用いて前記第２表示素子における第２補償画像データを生成し、さらに、前記第１表示素子と第２表示素子の中間に配置された中間表示素子に対して、前記第１補償画像データと前記第２補償画像データから、前記第１補償画像データと前記第２補償画像データの中間の値となる中間補償画像データを生成することを特徴とする請求項４に記載の表示パネルのムラ補正方法。     In the display panel, a first display element disposed in a central portion of the display panel and a second display element disposed in an end portion of the display panel are disposed,
    In the calculating step, a first accumulated charge amount in the first display element and a second accumulated charge amount in the second display element are calculated,
    In the compensation step, first compensated image data in the first display element is generated using the first accumulated charge amount, and second compensated image data in the second display element is generated using the second accumulated charge amount. And generating the first compensation image data from the first compensation image data and the second compensation image data with respect to the intermediate display element disposed between the first display element and the second display element. The display panel unevenness correction method according to claim 4, wherein intermediate compensation image data that is an intermediate value of the second compensation image data is generated.
  6. 　前記表示パネルは、互いに対向して配置される第１基板と第２基板を含み、前記第１基板と前記第２基板の間のセル厚が、前記表示パネルの端部から中央部にかけて直線状に変動しており、
    　前記中間補償画像データは、前記第１表示素子と前記中間表示素子との間の第１距離及び前記第２表示素子と前記中間表示素子との間の第２距離に基づいて生成されることを特徴とする請求項５に記載の表示パネルのムラ補正方法。     The display panel includes a first substrate and a second substrate disposed to face each other, and a cell thickness between the first substrate and the second substrate is linear from an end portion to a central portion of the display panel. Fluctuating to
    The intermediate compensation image data is generated based on a first distance between the first display element and the intermediate display element and a second distance between the second display element and the intermediate display element. The method for correcting unevenness of a display panel according to claim 5, wherein:
  7. 　前記表示パネルは、互いに対向して配置される第１基板と第２基板を含み、前記第１基板と前記第２基板の間のセル厚が、前記表示パネルの端部から中央部にかけて規定曲線に沿って変動しており、
    　前記中間補償画像データは、前記規定曲線に基づいて生成されることを特徴とする請求項５に記載の表示パネルのムラ補正方法。     The display panel includes a first substrate and a second substrate disposed to face each other, and a cell thickness between the first substrate and the second substrate is a prescribed curve from an end portion to a central portion of the display panel. And fluctuate along
    The display panel unevenness correction method according to claim 5, wherein the intermediate compensation image data is generated based on the prescribed curve.
  8. 　前記規定曲線を示すデータが、各表示素子の配置に対応して前記表示素子毎に記憶されていることを特徴とする請求項７に記載の表示パネルのムラ補正方法。 8. The display panel unevenness correction method according to claim 7, wherein data indicating the prescribed curve is stored for each display element corresponding to the arrangement of the display elements.
  9. 　前記表示パネルには、第１方向及び前記第１方向と直交する第２方向に等間隔に配置された複数の選択表示素子が配置されており、
    　前記算出工程では、前記選択表示素子における選択積算電荷量を算出し、
    　前記補償工程では、前記選択積算電荷量を用いて前記選択表示素子における前記補償画像データを生成し、さらに、前記選択表示素子ではない非選択表示素子に対して、隣接する前記選択表示素子の前記補償画像データを用いて前記補償画像データを生成することを特徴とする請求項４に記載の表示パネルのムラ補正方法。     The display panel includes a plurality of selection display elements arranged at equal intervals in a first direction and a second direction orthogonal to the first direction,
    In the calculation step, a selected integrated charge amount in the selection display element is calculated,
    In the compensation step, the compensated image data in the selected display element is generated using the selected integrated charge amount, and further, the non-selected display element that is not the selected display element is subjected to the selection display element adjacent to the selected display element. The display panel unevenness correction method according to claim 4, wherein the compensation image data is generated using the compensation image data.
  10. 　所定のセル厚を有する表示パネルを表示させる表示パネルの駆動回路であって、
    　前記表示パネルに基準データを印加して当該表示パネルを表示させる表示回路と、
    　前記基準データが印加される際に前記表示パネルに供給される電流を積算して積算電荷量を算出する算出回路と、
    　前記積算電荷量を前記基準データに対応して設定された基準電荷量と比較して前記表示パネルのセル厚の変動を補償する補償画像データを生成する補償回路と、を含むことを特徴とする駆動回路。     A display panel drive circuit for displaying a display panel having a predetermined cell thickness,
    A display circuit for displaying the display panel by applying reference data to the display panel;
    A calculation circuit for calculating an integrated charge amount by integrating a current supplied to the display panel when the reference data is applied;
    A compensation circuit that compares the accumulated charge amount with a reference charge amount set in correspondence with the reference data and generates compensation image data for compensating for a variation in cell thickness of the display panel. Driving circuit.
  11. 　請求項１０に記載の駆動回路と、
    　前記駆動回路で補償された補償画像データに基づいて表示を行う前記表示パネルと、
    を備える表示装置。     A drive circuit according to claim 10;
    The display panel for performing display based on compensated image data compensated by the drive circuit;
    A display device comprising:
  12. 　前記表示パネルが液晶を用いた液晶表示パネルであることを特徴とする請求項１１に記載の表示装置。 The display device according to claim 11, wherein the display panel is a liquid crystal display panel using liquid crystal.
PCT/JP2012/068949 2011-08-03 2012-07-26 Display panel unevenness correction method, drive circuit, and display device WO2013018647A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06281914A (en) * 1992-01-27 1994-10-07 Matsushita Electric Ind Co Ltd Liquid crystal driving circuit and display device
JPH06347759A (en) * 1992-12-25 1994-12-22 Canon Inc Liquid crystal display device
JPH09218391A (en) * 1996-02-09 1997-08-19 Sony Corp Ferroelectric liquid crystal driving device and its driving method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06281914A (en) * 1992-01-27 1994-10-07 Matsushita Electric Ind Co Ltd Liquid crystal driving circuit and display device
JPH06347759A (en) * 1992-12-25 1994-12-22 Canon Inc Liquid crystal display device
JPH09218391A (en) * 1996-02-09 1997-08-19 Sony Corp Ferroelectric liquid crystal driving device and its driving method

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