KR20090058888A - Liquid crystal display device for image scanner - Google Patents
Liquid crystal display device for image scanner Download PDFInfo
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- KR20090058888A KR20090058888A KR1020070125685A KR20070125685A KR20090058888A KR 20090058888 A KR20090058888 A KR 20090058888A KR 1020070125685 A KR1020070125685 A KR 1020070125685A KR 20070125685 A KR20070125685 A KR 20070125685A KR 20090058888 A KR20090058888 A KR 20090058888A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
- G02F1/13318—Circuits comprising a photodetector
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134336—Matrix
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
- G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/40—Arrangements for improving the aperture ratio
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention relates to a liquid crystal display device having a scanner function. In the liquid crystal display according to the present invention, a plurality of pixels consisting of red, green, and blue sub-pixels are arranged in a matrix form, and the first pixel (m, n ), Adjacent pixels based on the first pixel (m, n) are respectively a second pixel (m, n + 1), a third pixel (m + 1, n), and a fourth pixel (m + 1, n +). After defining one unit block divided by 1), at least one photo sensor is arranged in each of the four pixels included in each unit block, where m and n are each positive integers.
The photosensor is characterized by consisting of a capacitor for accumulating the optical voltage in proportion to the amount of light, a switching element for outputting the optical voltage stored in the capacitor and a switching element for controlling the output of the optical voltage to the external circuit.
Description
The present invention relates to a liquid crystal display device having a scanner function.
A typical liquid crystal display device (LCD) displays an image corresponding to the video data by adjusting the light transmittance of the liquid crystal according to the video data. Such a liquid crystal display device can increase the size of the screen beyond the limit while reducing the thickness. In addition, the liquid crystal display device can be made slimmer and lighter. In this respect, the liquid crystal display device is used as a display device of a computer or a display device of a television receiver in place of a cathode ray tube display device.
In the liquid crystal display, a pixel driving signal (or voltage) according to a gray scale value is applied to each of the liquid crystal cells arranged in a matrix form. The liquid crystal molecules included in the liquid crystal cell are aligned in a direction corresponding to a potential difference between the pixel driving signal and the reference voltage (or common voltage). The amount of light passing through the liquid crystal cell is adjusted according to the alignment direction of the liquid crystal molecules, so that an image is displayed.
Recently, the liquid crystal display device for displaying an image has been developed into a multifunctional device. In particular, a liquid crystal display device having a function of a scanner is added by adding an array for light sensing to an array for display. It is proposed.
When the scanner-integrated liquid crystal display is driven in a scanner mode, the scanner generates an optical voltage according to the received light amount and stores the optical voltage in an optical voltage storage capacitor, and outputs the stored optical voltage to an external circuit according to a scan signal to scan in the external circuit. The external circuit is normally driven in order of reading the image scan result by comparing with the reference voltage for reading, wherein the external circuit unit resets the reset voltage at the same level as the reference voltage together with the input of the optical voltage while the scan signal is applied. Outputting the photovoltage storage capacitor charges the photovoltage storage capacitor to an arbitrary voltage level.
However, the conventional scanner-integrated liquid crystal display device has a photo sensor formed in each of the red, green, and blue subpixels of the liquid crystal display panel, thereby reducing the area of the subpixels displaying an image.
Since the photo sensors for the scanner function occupy 40% or more of the aperture ratio of each sub-pixel, the image quality of the liquid crystal display is degraded, and power consumption is large.
SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device having a scanner function that can be implemented as a multi-function display device so that the liquid crystal display device can maximize the area displayed while serving as a scanner.
In the liquid crystal display device having a scanner function according to the present invention for achieving the above object, a plurality of pixels consisting of red, green and blue sub-pixels are arranged in a matrix form, m-th row and n-th column of the pixels The pixels that intersect the first pixel (m, n), and adjacent pixels based on the first pixel (m, n) are respectively the second pixel (m, n + 1) and the third pixel (m + 1, n). After defining one unit block by dividing into fourth pixels m + 1 and n + 1, at least one photo sensor is disposed in each of the four pixels included in each unit block, where m, n is each a positive integer)
The photosensor is characterized by consisting of a capacitor for accumulating the optical voltage in proportion to the amount of light, a switching element for outputting the optical voltage stored in the capacitor and a switching element for controlling the output of the optical voltage to the external circuit.
In addition, in the liquid crystal display device having a scanner function according to the present invention, a plurality of pixels composed of red, green, and blue sub-pixels are arranged in a matrix form, and the pixels in which the m-th row and the n-th column intersect are removed. Adjacent pixels based on one pixel (m, n), the first pixel (m, n) are respectively the second pixel (m, n + 1), the third pixel (m, n + 2), and the fourth pixel ( m, n + 3, fifth pixel (m + 1, n), sixth pixel (m + 1, n + 1), seventh pixel (m + 1, n + 2), eighth pixel (m + 1, n + 3, ninth pixel (m + 2, n), tenth pixel (m + 2, n + 1), eleventh pixel (m + 2, n + 2), twelfth pixel (m + 2, n + 3, thirteenth pixel (m + 3, n), fourteenth pixel (m + 3, n + 1), fifteenth pixel (m + 3, n + 2), sixteenth pixel (m + After defining one unit block by dividing 3, n + 3), at least one photo sensor is disposed in each of 16 pixels included in the unit block (where m and n are each positive integers).
The photosensor may include a capacitor configured to accumulate an optical voltage in proportion to an amount of light, a switching element for outputting an optical voltage stored in the capacitor, and a switching element for controlling output of the optical voltage to an external circuit.
As described in detail above, the present invention has an effect of having a scanner function while securing an opening area by selectively placing a photosensor in a sub pixel area of the liquid crystal display.
In addition, the present invention has the effect that can implement the same color image while using fewer photosensors than conventional.
The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.
Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. First, it should be noted that the same components or parts in the drawings represent the same reference numerals as much as possible. In describing the embodiments, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the gist of the embodiments.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a system block diagram of a liquid crystal display device having a scanner function according to the present invention.
Referring to FIG. 1, a liquid crystal display device having a scanner according to an exemplary embodiment of the present invention may include a gate driver 12 and a
In the liquid
The gate driver 12 sequentially enables a plurality of gate lines GL1 to GLn for one frame (period of one vertical synchronizing signal) sequentially by a predetermined period (for example, one horizontal synchronizing signal). . To this end, the gate driver 12 generates a plurality of gate signals having exclusively enable pulses which are sequentially shifted for each period of the horizontal synchronization signal. The gate enable pulse included in each of the plurality of gate signals has the same width as the period of the horizontal synchronization signal. The enable pulse included in each of the plurality of gate signals is generated once every frame period. To generate these multiple gate signals, the gate driver 12 responds to gate control signals GCS from the
Whenever one of the plurality of gate lines GL1 to GLn is enabled, the
The
In addition, in the photosensors disposed on the liquid
2 is a circuit diagram of a sub pixel of a liquid crystal display device having a scanner function according to the present invention.
As shown in FIG. 2, in the liquid crystal display having the scanner function provided by the present invention, switching to the display mode and the scanner mode is performed in a circuit to perform separate and distinct operations. The
The
The photo-sensing
The switching
The
The optical data stored in the memory is a circuit unit having an algorithm, and may be preferably embedded in a timing controller of the liquid crystal display device. When the difference between the optical voltage and the reference voltage Vref is 0, the
As described above, in the pixel structure of the liquid crystal display device having the scanner according to the embodiment of the present invention, all the switching elements are configured as N type thin film transistors, but may be configured as P type thin film transistors according to necessity and application.
3A and 3B are diagrams for describing a scan driving method of a liquid crystal display device having a scanner function according to the present invention.
2 and 3A, the scanner mode driving of the liquid crystal display of the present invention divides the effective time of the scan signal sequentially applied to the respective gate lines GLn and GLn + 1 to store the optical voltage of each pixel. And a second time (1) for outputting the optical voltage stored in the capacitor to the read circuit unit 17 (Fig. 2) and a second time (2) for outputting a reset voltage from the read circuit unit to the optical voltage storage capacitor. . Thereafter, during the third time (③) during which the scan signal is not applied, the scanner operation is performed by configuring the optical voltage to be charged with the optical voltage storage capacitor again.
Referring to FIGS. 2 and 3B, another scanner mode driving of the liquid crystal display of the present invention may be performed in a first time within about one frame driving time (or may be longer than one frame driving time) immediately after switching to the scanner mode. (I) prior to driving to simultaneously apply the first voltage V1 of the same voltage level as the reference voltage Vref of the read
In this case, the second time given to the driving timing (2) is a delay time or an integrated circuit which appears according to an operating characteristic of the readout circuit unit 17 (FIG. 2), which is generally manufactured as an integrated circuit chip (IC chip). Depending on the type of chip, the
Next, driving of the scanner after the first time (1) and the second time (2) will be described. Scan signals Vg (n) and Vg (n + 1) are applied to the respective gate lines GLn and GLn + 1. ) Is sequentially applied, and the third switching element T3 of the switching
Finally, during the fifth time (5) when the scan signal is not applied, the optical voltage output by the light sensing of the second switching element T2 of the
4A and 4B are layout views of a photo sensor disposed in a sub pixel area of a liquid crystal display apparatus having a scanner function according to the present invention.
As shown in FIG. 4A, in the present invention, the photosensor is not disposed in each of the subpixels (red, green, and blue subpixels) of the liquid crystal display panel, and the subpixels are disposed according to a predetermined design condition regarding the photosensor arrangement. Optionally place the photosensor.
The red (R), green (G), and blue (B) subpixels are defined as one pixel, and these four pixels are designed such that one photosensor is disposed in an adjacent unit block. As shown in the figure, a pixel corresponding to any m rows and n columns of a plurality of pixels arranged in a matrix form is called a first pixel (m, n) and is horizontally aligned with the first pixel (m, n). An adjacent pixel is referred to as a second pixel (m, n + 1), a pixel adjacent to the first pixel (m, n) in a vertical direction is referred to as a third pixel (m + 1, n), and a third pixel (m) A pixel adjacent to + 1, n in the horizontal direction and adjacent to the second pixel m, n + 1 in the vertical direction is defined as a fourth pixel m + 1,
As described above, four pixels are defined as one block, and then a first photosensor Pr (m, n) is disposed on the red (R) subpixel of the first pixel (m, n), and the second pixel is disposed. The second photosensor Pg (m, n + 1) is disposed in the green subpixel of (m, n + 1), and the third photosensor Pg (m + 1, n) is disposed, and the fourth photosensor Pb (m + 1, n + 1) is disposed in the blue subpixel of the fourth pixel m + 1,
By arranging the photosensors according to the above rules, an arrangement structure of the photosensors as shown in FIG. 4B can be obtained. Each of Pr, Pg, and Pb represents a photosensor disposed in red, green, and blue subpixels, Pr represents a photosensor in a red subpixel of each subpixel, Pg represents a green subpixel, and Pb represents a Photosensors are disposed on the blue sub-pixels.
Although the blue pixel data is received in the region Pb22 corresponding to the blue sub-pixel in FIG. 4B, the green pixel data in the (2, 2) -th pixel region is determined by Pg22 = (Pg12 + Pg21 + Pg23 + Pg32) / 4. You can get the value. In addition, the red pixel data value in the (2, 2) -th pixel region can be inferred with Pr22 = (Pr11 + Pr13 + Pr31 + Pr33) / 4. Such a method is obtained by a de mosaic method applied in the field of a known CCD or CMOS imaging device.
In the present invention, as shown in the figure, the photo sensor is disposed only in some sub pixel areas of the sub pixels of the pixel area, and the pixel data value of the sub pixel area in which the photosensor is not arranged using the pixel data obtained by the scanner operation. Can be obtained.
5A and 5B are layout views of a photo sensor disposed in a sub pixel area of a liquid crystal display having a scanner function according to another exemplary embodiment of the present invention.
Referring to FIG. 5A, in another embodiment of the present invention, the red (R), green (G), and blue (B) sub-pixels are defined as one pixel, and these 16 pixels are each one in an adjacent unit block. The photosensor is designed to be arranged. As shown in the figure, one pixel is referred to as a first pixel (m, n), and a pixel adjacent in the horizontal direction to the first pixel (m, n) is referred to as a second pixel (m, n + 1). And a third pixel (m, n + 2) horizontally adjacent to the second pixel (m, n + 1) and a fourth pixel (m) adjacent to the third pixel (m, n + 2). , n + 3).
In the same manner as described above, the fifth pixel (m + 1, n), the sixth pixel (m + 1, n + 1), the seventh pixel (m + 1, n + 2), and the eighth pixel (m + 1, n + 3, a ninth pixel (m + 2, n), a tenth pixel (m + 2, n + 1), an eleventh pixel (m + 2, n + 2), a twelfth pixel (m + 2, n + 3, thirteenth pixel (m + 3, n), fourteenth pixel (m + 3, n + 1), fifteenth pixel (m + 3, n + 2), and sixteenth pixel (m + 3, n + 3), where m and n are each positive integers.
As such, the first photosensor Pr (m, n) is disposed in the red (R) subpixel of the first pixel m, n for the 16 pixel blocks, and the second pixel m, n + The second photosensor Pg (m, n + 1) is disposed in the green subpixel of 1), and the third photosensor Pb (m, n) is disposed in the blue subpixel of the third pixel m, n + 2. +2)), and the fourth photosensor Pg (m, n + 3) is disposed in the green sub-pixels of the fourth pixel m, n + 3, respectively.
In this manner, the blue sub-pixel of the fifth photosensor Pg (m + 1, n) and the sixth pixel m + 1, n + 1 are connected to the green sub-pixel of the fifth pixel m + 1, n. A sixth photosensor Pb (m + 1, n + 1) on the pixel and a seventh photosensor Pg (m + 1, n + 2 on the green sub-pixel of the seventh pixel m + 1,
By arranging the photosensors according to the above rules, an arrangement structure of the photosensors as shown in FIG. 5B can be obtained. Each of Pr, Pg, and Pb is a pixel having red, green, and blue subpixels as one unit, and Pr is a photo sensor disposed on a red subpixel, and Pg is a green subpixel and Pb Photosensors are disposed on the blue sub-pixels.
Further, when the photosensors are arranged as described above, only one photosensor is disposed in the vertical pixel direction (m column direction) in the red sub-pixel and the blue sub-pixel around the 16 pixels. Accordingly, the photosensors are arranged in units of four color-sensitive red subpixels and blue subpixels to improve image quality in the display mode.
5b is different from the arrangement of the photosensor 4b.
By using the photosensor disposed in the green sub-pixel area, the green pixel data value in the (2, 2) -th pixel area may be obtained. The green pixel data values are obtained for all the pixels in which the photosensors are arranged in the green subpixels according to the formula Pg22 = (Pg12 + Pg21 + Pg23 + Pg32) / 4.
Using the green pixel data obtained as described above, red and blue pixel data values in the remaining pixel areas are obtained.
The principle to find is as follows.
Pr22 = Pg22 * {(Pr11 / Pg11) + (Pr33 / Pg33)} / 2
Pr23 = Pg23 * {(Pr24 / Pg24) + (Pr33 / Pg33)} / 2
Pb21 = Pg21 * {(Pb31 / Pg31) + (Pb22 / Pg22)} / 2
Pb33 = Pg33 * {(Pb44 / Pg44) + (Pb22 / Pg22)} / 2
In the present invention, as shown in the figure, the photo sensor is disposed only in some sub pixel areas of the sub pixels of the pixel area, and the pixel data of the sub pixel area where the photosensor is not arranged is obtained using the pixel data obtained by the scanner operation. Can be.
Therefore, there is an advantage that the scanner function can be completely performed while ensuring the display area of the liquid crystal display device as much as possible.
1 is a system block diagram of a liquid crystal display device having a scanner function according to the present invention.
2 is a circuit diagram of a sub pixel of a liquid crystal display device having a scanner function according to the present invention.
3A and 3B are diagrams for describing a scan driving method of a liquid crystal display device having a scanner function according to the present invention.
4A and 4B are layout views of a photo sensor disposed in a sub pixel area of a liquid crystal display apparatus having a scanner function according to the present invention.
5A and 5B are layout views of a photo sensor disposed in a sub pixel area of a liquid crystal display having a scanner function according to another exemplary embodiment of the present invention.
* Description of the symbols for the main parts of the drawings *
10 liquid crystal display panel 12 gate driver
14: Data Driver 16: Timing Controller
17: read circuit 18: memory
Claims (6)
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KR1020070125685A KR20090058888A (en) | 2007-12-05 | 2007-12-05 | Liquid crystal display device for image scanner |
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KR1020070125685A KR20090058888A (en) | 2007-12-05 | 2007-12-05 | Liquid crystal display device for image scanner |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110063045A (en) * | 2009-12-04 | 2011-06-10 | 엘지디스플레이 주식회사 | Liquid crystal display with scanner and driving method of the same |
KR20110066483A (en) * | 2009-12-11 | 2011-06-17 | 엘지디스플레이 주식회사 | Liquid crystal display device for image scan and display and scan mode driving method thereof |
US8994618B2 (en) | 2011-02-11 | 2015-03-31 | Samsung Display Co., Ltd. | Display device and operating method thereof |
WO2015158028A1 (en) * | 2014-04-18 | 2015-10-22 | 深圳市华星光电技术有限公司 | Pixel electrode unit, display panel, and liquid crystal display |
-
2007
- 2007-12-05 KR KR1020070125685A patent/KR20090058888A/en not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110063045A (en) * | 2009-12-04 | 2011-06-10 | 엘지디스플레이 주식회사 | Liquid crystal display with scanner and driving method of the same |
KR20110066483A (en) * | 2009-12-11 | 2011-06-17 | 엘지디스플레이 주식회사 | Liquid crystal display device for image scan and display and scan mode driving method thereof |
US8994618B2 (en) | 2011-02-11 | 2015-03-31 | Samsung Display Co., Ltd. | Display device and operating method thereof |
WO2015158028A1 (en) * | 2014-04-18 | 2015-10-22 | 深圳市华星光电技术有限公司 | Pixel electrode unit, display panel, and liquid crystal display |
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