KR20110121826A - Stereoscopic image display device - Google Patents

Stereoscopic image display device Download PDF

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Publication number
KR20110121826A
KR20110121826A KR1020100041299A KR20100041299A KR20110121826A KR 20110121826 A KR20110121826 A KR 20110121826A KR 1020100041299 A KR1020100041299 A KR 1020100041299A KR 20100041299 A KR20100041299 A KR 20100041299A KR 20110121826 A KR20110121826 A KR 20110121826A
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KR
South Korea
Prior art keywords
backlight unit
display panel
temperature
data
control signal
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KR1020100041299A
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Korean (ko)
Inventor
류승만
박준영
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020100041299A priority Critical patent/KR20110121826A/en
Publication of KR20110121826A publication Critical patent/KR20110121826A/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
    • G09G3/3406—Control of illumination source
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE: A 3D video display apparatus is provided to solve 3D cross-torque by controlling the lightness of a back light unit and by turning on the back light unit in an optimized timing. CONSTITUTION: A 3D video display apparatus includes a display panel, a backlight unit, a temperature sensor, and a backlight unit controller. The display panel displays a 3D video. The backlight unit emits light to the display panel. The temperature sensor senses the temperature of the display panel. The backlight unit controller controls the lighting hour of the backlight unit by receiving temperature data in which is inputted from the temperature sensor.

Description

Stereoscopic Display Device {STEREOSCOPIC IMAGE DISPLAY DEVICE}

The present invention relates to a stereoscopic image display device.

The stereoscopic image display apparatus is divided into a binocular parallax technique and an autostereoscopic technique.

The binocular parallax method uses a parallax image of the left and right eyes with a large stereoscopic effect, and there are glasses and no glasses, both of which are put to practical use. In the spectacle method, the polarization of the left and right parallax images is displayed on the direct view display device or the projector or displayed in a time division method. The glasses method implements a stereoscopic image using polarized glasses or liquid crystal shutter glasses. In the autostereoscopic method, an optical plate such as a parallax barrier and a lenticular lens is generally used to realize a stereoscopic image by separating an optical axis of a parallax image.

1 is a graph showing a 3D crosstalk ratio according to the surface temperature of a display panel. 3D crosstalk refers to the overlapping of the left eye image and the right eye image in a 3D image. Referring to FIG. 1, the higher the surface temperature of the display panel, the lower the 3D crosstalk ratio at all gray levels. Although the surface temperature of the display panel is only 27 ° C. during initial driving, the surface temperature of the display panel rises to about 33 ° C. after 2 hours of aging. In addition, since the surface temperature of the display panel rises to about 38 ° C at the time of set tightening, the fluctuation range of the temperature is further increased.

As shown in FIG. 1, since the response characteristics of the liquid crystal change according to the surface temperature of the display panel, the 3D crosstalk ratio varies according to the surface temperature of the display panel. However, the backlight unit is driven to a fixed set value without considering the change in the surface temperature of the display panel. In this case, since the backlight unit is driven irrespective of the change in the response characteristic of the liquid crystal of the display panel, 3D crosstalk may occur.

The present invention provides a stereoscopic image display device that can improve 3D crosstalk in a 3D image.

The stereoscopic image display device of the present invention comprises a display panel for displaying a stereoscopic image; A backlight unit radiating light onto the display panel; A temperature sensor detecting a temperature of the display panel; And a backlight unit controller configured to adjust a backlight unit lighting time in response to temperature data input from the temperature sensor.

The stereoscopic image display device of the present invention comprises a display panel for displaying a stereoscopic image; A backlight unit radiating light onto the display panel; A temperature sensor detecting a temperature of the display panel; And a backlight unit controller configured to adjust a backlight unit lighting time in response to temperature data input from the temperature sensor, wherein the backlight unit is divided into at least two blocks along a data scan direction of the display panel. The blocks may be sequentially turned on along the scan direction of the data by turning on the light sources of the backlight unit.

According to the present invention, the backlight unit is turned on at an optimal timing in consideration of the response characteristic of the liquid crystal according to the surface temperature of the display panel through the temperature compensation circuit, and the brightness of the backlight unit is adjusted. Furthermore, the present invention divides the backlight unit into blocks, and lights the blocks sequentially. As a result, the present invention can improve 3D crosstalk.

1 is a graph illustrating crosstalk ratios according to surface temperatures of a display panel.
2 is a block diagram illustrating a stereoscopic image display device according to a first exemplary embodiment of the present invention.
3 is a flowchart illustrating a method of driving a stereoscopic image display device according to a first embodiment of the present invention.
4 is a waveform diagram illustrating response characteristics of liquid crystals and driving of a backlight unit when the display panel according to the first exemplary embodiment of the present invention increases in temperature.
5 is a waveform diagram illustrating response characteristics of liquid crystals and driving of a backlight unit when the display panel according to the first exemplary embodiment of the present invention has a temperature drop.
6 is a block diagram illustrating a stereoscopic image display device according to a second exemplary embodiment of the present invention.
7 is a flowchart illustrating a stereoscopic image display device according to a second exemplary embodiment of the present invention.
FIG. 8 is a waveform diagram illustrating response characteristics of liquid crystals and driving of a backlight unit when a display panel increases in temperature according to a second exemplary embodiment of the present invention.
9 is a waveform diagram illustrating response characteristics of liquid crystals and driving of a backlight unit when the display panel according to the second exemplary embodiment of the present invention decreases in temperature.
10 is a block diagram illustrating a stereoscopic image display device according to a third exemplary embodiment of the present invention.
11 is a flowchart illustrating a stereoscopic image display device according to a third exemplary embodiment of the present invention.
12 is a waveform diagram illustrating response characteristics of a liquid crystal and driving of a backlight unit according to a third exemplary embodiment of the present invention.
13 is a graph showing the ratio of 3D crosstalk according to the backlight unit driving method.
FIG. 14 is a view illustrating a blinking backlight unit driving method of FIG. 13.
FIG. 15 is a view illustrating a driving method of the scanning backlight unit of FIG. 13.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like numbers refer to like elements throughout. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Component names used in the following description may be selected in consideration of ease of specification, and may be different from actual product part names.

2 is a block diagram illustrating a stereoscopic image display device according to a first exemplary embodiment of the present invention. Referring to FIG. 2, the stereoscopic image display device according to the first embodiment of the present invention includes a display panel 10, a backlight unit 20, a liquid crystal shutter glasses 30, a temperature sensor 50, and a look-up table ( 60, the display panel driver 110, the backlight unit driver 120, the liquid crystal shutter glasses control signal receiver 130, the liquid crystal shutter glasses control signal transmitter 140, the temperature compensation circuit 150, and the backlight unit controller 160. And a timing controller 170 and a system board 180.

The display panel 10 alternately displays left eye image data RGB L and right eye image data RGB R under the control of the timing controller 170. The display panel 10 may display two-dimensional image data RGB without distinguishing between the left eye image and the right eye image under the control of the timing controller 170. The display panel 10 may be selected as a hold type display device requiring the backlight unit 20. As the hold type display device, a transmissive liquid crystal display panel that modulates light from the backlight unit 20 may be selected.

The transmissive liquid crystal display panel includes a thin film transistor (TFT) substrate and a color filter substrate. A liquid crystal layer is formed between the TFT substrate and the color filter substrate. On the TFT substrate, the data lines and the gate lines (or scan lines) are formed to cross each other on the lower glass substrate, and the liquid crystal cells are arranged in a matrix form in the cell regions defined by the data lines and the gate lines. do. The TFT formed at the intersection of the data lines and the gate lines transfers the data voltage supplied through the data lines to the pixel electrode of the liquid crystal cell in response to the scan pulse from the gate line. For this purpose, the gate electrode of the TFT is connected to the gate line, and the source electrode is connected to the data line. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell. The common voltage is supplied to the common electrode facing the pixel electrode. The color filter substrate includes a black matrix and a color filter formed on the upper glass substrate. The common electrode is formed on the upper glass substrate in a vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode, and a horizontal electric field such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. The driving method is formed on the lower glass substrate together with the pixel electrode. A polarizing plate is attached to each of the upper glass substrate and the lower glass substrate of the transmissive liquid crystal display panel, and an alignment layer for setting the pre-tilt angle of the liquid crystal is formed. A spacer for maintaining a cell gap of the liquid crystal layer is formed between the upper glass substrate and the lower glass substrate of the transmissive liquid crystal display panel. The liquid crystal mode of the transmissive liquid crystal display panel may be implemented in any liquid crystal mode as well as the above-described TN mode, VA mode, IPS mode, FFS mode.

The display panel driver 110 includes a data driver circuit and a gate driver circuit. The data driving circuit converts the data (RGB L , RGB R ) of the left eye image and the right eye image input from the timing controller 170 into the positive / negative gamma compensation voltage in the 3D image, thereby converting the positive / negative analog data. Generate voltages. Positive / negative analog data voltages output from the data driving circuit are supplied to the data lines of the display panel 10. The gate driving circuit sequentially supplies gate pulses (or scan pulses) synchronized with data voltages to gate lines of the display panel 10.

The backlight unit 20 is turned on for a predetermined time, irradiates light to the display panel 10, and turns off for other periods. The backlight unit 20 includes a light source, a light guide plate (or a diffusion plate), a plurality of optical sheets, and the like, which light up according to the driving power supplied from the backlight unit driver 120. The backlight unit 20 may be implemented as a direct type backlight unit or an edge type backlight unit. The light sources of the backlight unit 20 may include any one of a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), a light emitting diode (LED), or two or more light sources. can do.

The backlight unit driver 120 generates driving power for turning on light sources of the backlight unit 20. The backlight unit driver 120 periodically turns on / off driving power supplied to the light sources under the control of the backlight unit controller 160.

The liquid crystal shutter glasses 30 have a left eye shutter ST L and a right eye shutter ST R that are electrically controlled separately. Each of the left eye shutter ST L and the right eye shutter ST R includes a first transparent substrate, a first transparent electrode formed on the first transparent substrate, a second transparent substrate, a second transparent electrode formed on the second transparent substrate, and And a liquid crystal layer sandwiched on the first and second transparent substrates. The reference voltage is supplied to the first transparent electrode and the ON / OFF voltage is supplied to the second transparent electrode. Each of the left eye shutter ST L and the right eye shutter ST R transmits light from the display panel 10 when the ON voltage is supplied to the second transparent electrode, while the OFF eye is supplied to the second transparent electrode. Light from the display panel 10 is blocked.

The liquid crystal shutter glasses control signal transmitter 140 is connected to the timing controller 170 and receives the liquid crystal shutter glasses control signal C ST input from the timing controller 170 through a wired / wireless interface. To be sent). The liquid crystal shutter glasses control signal receiver 130 is installed in the liquid crystal shutter glasses 30 to receive the liquid crystal shutter control signal C ST through a wired / wireless interface, and the liquid crystal shutter glasses according to the liquid crystal shutter control signal C ST . The left eye shutter ST L and the right eye shutter ST R of 30 are alternately opened and closed.

When the liquid crystal shutter control signal C ST is input to the liquid crystal shutter control signal receiver 130 as a first logic value, the ON voltage is supplied to the second transparent electrode of the left eye shutter ST L while the right eye shutter ST is supplied. The OFF voltage is supplied to the second transparent electrode of R ). When the liquid crystal shutter control signal C ST is input to the liquid crystal shutter control signal receiver 130 as the second logic value, the OFF voltage is supplied to the second transparent electrode of the left eye shutter ST L , while the right eye shutter ST is supplied. The ON voltage is supplied to the second transparent electrode of R ). Therefore, the left eye shutter ST L of the liquid crystal shutter glasses 30 is opened when the liquid crystal shutter control signal C ST is generated as the first logical value, and the right eye shutter ST R of the liquid crystal shutter glasses 30 is It is opened when the liquid crystal shutter control signal C ST is generated as the second logic value. The first logic value may be set to a high logic voltage, and the second logic value may be set to a high logic voltage.

The temperature sensor 50 detects the temperature of the display panel 10, converts the detected temperature into an electrical signal T P , and transmits the temperature to the temperature compensation circuit 150. The temperature compensation circuit 150 receives the temperature of the display panel 10 sensed by the temperature sensor 50 and transmits the temperature of the display panel 10 to the look-up table 60.

The look-up table 60 stores data relating to a temperature of the display panel 10 and a timing of turning on the backlight unit, which is predetermined at an optimum timing according to the temperature. The backlight unit lighting timing data D T is determined through experiments on the change in the response characteristic of the liquid crystal due to the temperature change of the display panel 10. This will be described later with reference to FIGS. 4 and 5.

The look-up table 60 receives the temperature of the display panel 10 from the temperature compensation circuit 150 as an input address and selects backlight unit lighting timing data D T stored at the address. The look-up table 60 transmits the selected backlight unit lighting timing data D T to the temperature compensation circuit 150.

The temperature compensation circuit 150 receives the backlight unit lighting timing data D T from the look-up table 60, and transmits the backlight unit lighting timing data D T to the backlight unit controller 160.

The timing controller 170 multiplies the frame frequency by L times, preferably 4 times or more, of the input frame frequency, and displays the display panel control signal C DIS , the backlight unit control signal C BLU , And a liquid crystal shutter glasses control signal C ST . The input frame frequency is 50 Hz in PAL (Phase Alternate Line) scheme and 60 Hz in NTSC (National Television Standards Committee) scheme. Accordingly, when the timing controller 170 multiplies the input frame frequency by four times, the display panel control signal C DIS , the backlight unit control signal C BLU , and the liquid crystal shutter glasses control signal C based on the frame frequency of 200 Hz or more. Multiply the frequency of ST ). One frame period is 5 msec when the frame frequency is 200 Hz, and one frame period is about 4.16 msec when the frame frequency is 240 Hz.

The display panel control signal C DIS includes a data control signal for controlling the operation timing of the data driving circuit and a gate control signal for controlling the operation timing of the gate driving circuit. The data control signal includes a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, a polarity control signal POL, and the like. The source start pulse SSP controls the data sampling start time of the data driving circuit. The source sampling clock is a clock signal that controls the sampling operation of the data driving circuit based on the rising or falling edge. If the digital video data to be input to the data driving circuit is transmitted in mini LVDS (Low Voltage Differential Signaling) interface standard, the source start pulse SSP and the source sampling clock SSC may be omitted. The polarity control signal POL inverts the polarity of the data voltage output from the data driving circuit in a period of L (L is a positive integer) horizontal period. The source output enable signal SOE controls the output timing of the data driver circuit.

The gate control signal includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (Gate Output Enable, GOE), and the like. The gate start pulse GSP controls the timing of the first gate pulse. The gate shift clock GSC is a clock signal for shifting the gate start pulse GSP. The gate output enable signal GOE controls the output timing of the gate driving circuit.

The timing controller 170 may include a frame counter, a line counter, a memory, and the like. The frame counter generates a frame count signal by counting a signal in which a pulse is generated once in one frame period (one vertical period) such as the vertical synchronization signal Vsync or the gate start pulse GSP. The line counter generates a line count signal by counting a signal in which a pulse is generated once in one horizontal period, such as a horizontal synchronization signal Hsync or a data enable signal DE.

The backlight unit controller 160 receives the backlight unit lighting timing data D T from the temperature compensation circuit 150, and receives the frame count signal and the line count signal from the timing controller 170. The backlight unit controller 160 may determine the frame period and the unlit period of the backlight unit 20 through the frame counter signal, the line counter signal, and the backlight unit lighting timing data D T.

The backlight unit controller 160 outputs the backlight unit control signal C BLU to the backlight unit driver 120. The backlight unit control signal C BLU controls the backlight unit driver 120 to periodically turn on and off the light sources of the backlight unit 20 as shown in FIGS. 4 and 5.

The timing controller 170 may determine the liquid crystal shutter glasses control signal C ST through the frame counter signal and the line counter signal. The timing controller 170 outputs the liquid crystal shutter glasses control signal C ST to the liquid crystal shutter glasses control signal transmitter 140. The liquid crystal shutter glasses control signal C ST is transmitted to the liquid crystal shutter glasses control signal receiver 130 to open and close the left eye shutter ST L and the right eye shutter ST R of the liquid crystal shutter eyeglasses 30 alternately.

The backlight unit controller 160 receives input digital video data RGB from the timing controller 170. The backlight unit controller 160 multiplies the input digital video data RGB by a predetermined gain to transmit the timing controller 170 to alleviate grayscale saturation problems that may occur due to backlight dimming. .

The timing controller 170 receives input digital video data RGB multiplied by a predetermined gain value from the backlight unit controller 160, and temporarily stores the input digital video data RGB in the memory. In the 3D image, left eye image data RGB L and right eye image data RGB R are alternately encoded in units of one frame.

The timing controller 170 continuously transmits the same left eye image data RGB L during the N + 1 (N is a natural number) and N + 2 frame periods, and the same during the N + 3 and N + 4 frame periods. The right eye image data RGB R is continuously transmitted. In addition, the timing controller 170 may differently convert the gamma characteristic of the left eye image data RGB L into one frame period unit, and differently convert the gamma characteristic of the continuous right eye image data RGB R into one frame period unit. have.

The system board 180 converts the resolution of the image data RGB input from the outside to match the resolution of the display panel 10 and converts various timing signals (Vsync, Hsync, DE, CLK, etc.) into the timing controller 170. To transmit. The system board 180 generates a dimming signal based on the analysis result of the input image and transmits the dimming signal to the backlight unit controller 160.

The backlight unit controller 160 receives a dimming signal from the system board 180. The dimming signal includes a global dimming signal, and / or a local dimming signal.

3 is a flowchart illustrating a method of driving a stereoscopic image display device according to a first exemplary embodiment of the present invention, and FIGS. 4 and 5 illustrate a response characteristic of a liquid crystal and a backlight unit according to a temperature of the display panel 10 of the present invention. 20 is a waveform diagram showing driving. This will be described in detail with reference to the stereoscopic image display device shown in FIG. 2.

Referring to FIG. 3, the temperature sensor 50 detects a temperature of the display panel 10. The temperature sensor 50 converts the sensed temperature of the display panel 10 into an electrical signal T P and transmits the temperature to the temperature compensation circuit 150. The temperature transmitted by the temperature sensor 50 may be an average value of one frame period or may be a temperature at that time. (S101)

The timing controller 170 generates the display panel control signal C DIS during the N + 1th frame period. The timing controller 170 supplies the left eye image data RGB L to the data driving circuit during the N + 1th frame period, and generates the liquid crystal shutter glasses control signal C ST with high logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic.

The data driving circuit supplies the data voltage of the left eye image data RGB L to the data lines of the display panel 10 during the N + 1th frame period, and supplies the left eye image data RGB L to the pixels of the display panel 10. Addressing The liquid crystal shutter eyeglasses control signal receiver 130 opens the left eye shutter ST L in response to the liquid crystal shutter eyeglasses control signal C ST having a high logic. The backlight unit driver 120 turns off the light sources of the backlight unit 20 during the N + 1th frame period in response to the low logic backlight unit control signal C BLU . (S102, S103)

The timing controller 170 generates the display panel control signal C DIS during the N + 2th frame period. The timing controller 170 supplies the left eye image data RGB L to the data driving circuit during the N + 2th frame period, and maintains the liquid crystal shutter glasses control signal C ST at high logic. The backlight unit controller 160 generates the backlight unit control signal C BLU with low logic at the beginning of the N + 2th frame period, and T off. The backlight unit control signal C BLU is inverted to a high logic at the time elapsed.

The data driving circuit supplies the data voltage of the left eye image data RGB L to the data lines of the display panel 10 during the N + 2th frame period, and supplies the left eye image data RGB L to the pixels of the display panel 10. Addressing The liquid crystal shutter eyeglasses control signal receiver 130 opens the left eye shutter ST L in response to the liquid crystal shutter eyeglasses control signal C ST having a high logic. The backlight unit driver 120 T off from the start point of the N + 2th frame period in response to the high logic backlight unit control signal C BLU . The light sources of the backlight unit 20 are turned on from the time elapsed. (S104 to S107)

The timing controller 170 generates the display panel control signal C DIS during the N + 3th frame period. The timing controller 170 supplies the right eye image data RGB R to the data driving circuit during the N + 3th frame period, and generates the liquid crystal shutter glasses control signal C ST in low logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic.

The data driving circuit supplies the data voltage of the right eye image data RGB R to the data lines of the display panel 10 during the N + 3th frame period to supply the right eye image data RGB R to the pixels of the display panel 10. Addressing The liquid crystal shutter glasses control signal receiving unit 130 opens the right eye shutter ST R in response to the liquid crystal shutter glasses control signal C ST having a low logic. The backlight unit driver 120 turns off the light sources of the backlight unit 20 during the N + 3th frame period in response to the low logic backlight unit control signal C BLU . (S108, S109)

The timing controller 170 generates the display panel control signal C DIS during the N + 4th frame period. The timing controller 170 supplies the right eye image data RGB R to the data driving circuit during the N + 4th frame period, and maintains the liquid crystal shutter glasses control signal C ST in a low logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic at the beginning of the N + 4th frame period, and T off. The backlight unit control signal C BLU is inverted to a high logic at the time elapsed.

The data driving circuit supplies the data voltage of the right eye image data RGB R to the data lines of the display panel 10 during the N + 4th frame period to supply the right eye image data RGB R to the pixels of the display panel 10. Addressing The liquid crystal shutter glasses control signal receiving unit 130 opens the right eye shutter ST R in response to the liquid crystal shutter glasses control signal C ST having a low logic. The backlight unit driver 120 T off from the start point of the N + 4th frame period in response to the high logic backlight unit control signal C BLU . The light sources of the backlight unit 20 are turned on from the time elapsed. (S110 to S113)

4 and 5, T off  Denotes a delay time of turning on the backlight unit on the basis of the time point of the N + 2 or N + 4th frame period. T off  Is the time until the liquid crystal of the display panel 10 responds and reaches the target value P. FIG. The target value P may be set to 90% or more of the target luminance corresponding to the gray value of the data voltage.

In FIG. 4, since the response speed of the liquid crystal increases as the temperature of the display panel 10 increases, the time for the liquid crystal of the display panel 10 to reach the target value P becomes short. Therefore, the backlight unit lighting delay time T off is shifted forward than before the temperature rises, and the backlight unit lighting time T on becomes longer. (T on → T ' on ) The backlight unit lighting time T on The start time of is accelerated as the temperature of the display panel increases.

In FIG. 5, the lower the temperature of the display panel 10 is, the lower the response speed of the liquid crystal becomes, so that the time for the liquid crystal of the display panel 10 to reach the target value P becomes longer. Therefore, the backlight unit lighting delay time T off is shifted backward than before the temperature rises, and the backlight unit lighting time T on is shortened. (T on → T ″ on ) The backlight unit lighting time T on The start time of is slowed down as the temperature of the display panel decreases.

6 is a block diagram illustrating a stereoscopic image display device according to a second exemplary embodiment of the present invention. Referring to FIG. 6, the look-up table 60 may be configured to adjust the backlight unit lighting timing determined at an optimum timing according to the temperature of the display panel 10, the temperature of the display panel 10, and the temperature of the display panel 10. Accordingly, data about the driving current of the backlight unit 20 which is predetermined in advance is stored. The backlight unit lighting timing data D T is determined through experiments on the change in response characteristics of the liquid crystal according to the temperature change of the display panel 10, which has been described with reference to FIGS. 4 and 5. A detailed description of the driving current data D I of the backlight unit 20 will be described later with reference to FIGS. 8 and 9.

The look-up table 60 receives the temperature of the display panel 10 from the temperature compensation circuit 150 as an input address, and turns on backlight unit lighting timing data D T and driving current data D I stored at the address. Select. The look-up table 60 transmits the selected backlight unit lighting timing data D T and the driving current data D I to the temperature compensation circuit 150.

The temperature compensation circuit 150 receives the backlight unit lighting timing data D T and the driving current data D I from the look-up table 60, and the backlight unit lighting timing data D T , and the driving current. The data D I is transmitted to the backlight unit controller 160.

The backlight unit controller 160 receives the backlight unit lighting timing data D T and the driving current data D I from the temperature compensation circuit 150, and receives the frame count signal and the line count signal from the timing controller 170. Receive. The backlight unit controller 160 may determine the frame period and the unlit period of the backlight unit 20 through the frame counter signal, the line counter signal, and the backlight unit lighting timing data D T.

The backlight unit controller 160 outputs the backlight unit control signal C BLU to the backlight unit driver 120. The backlight unit control signal C BLU controls the backlight unit driver 120 to periodically turn on and off the light sources of the backlight unit 20 as shown in FIGS. 8 and 9.

In addition, the backlight unit controller 160 outputs the driving current data D I to the backlight unit driver 120 together with the backlight unit control signal C BLU . The backlight unit driver 120 adjusts the brightness of the backlight unit 20 according to the driving current data D I. A detailed description thereof will be described later with reference to FIGS. 8 and 9.

In addition, another description of the stereoscopic image display device according to the second embodiment of the present invention is the same as FIG. 2.

7 is a flowchart illustrating a method of driving a stereoscopic image display device according to a second exemplary embodiment of the present invention, and FIGS. 8 and 9 illustrate a response characteristic of a liquid crystal and a backlight unit according to a temperature of the display panel 10 of the present invention. 20 is a waveform diagram showing driving. This will be described in detail with reference to the stereoscopic image display device shown in FIG. 6.

Referring to FIG. 7, the temperature sensor 50 detects the temperature of the display panel 10. The temperature sensor 50 converts the sensed temperature of the display panel 10 into an electrical signal T P and transmits the temperature to the temperature compensation circuit 150. The temperature transmitted by the temperature sensor 50 may be an average value of one frame period or may be a temperature at that time. (S201)

The timing controller 170 generates the display panel control signal C DIS during the N + 1th frame period. The timing controller 170 supplies the left eye image data RGB L to the data driving circuit during the N + 1th frame period, and generates the liquid crystal shutter glasses control signal C ST with high logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic.

The data driving circuit supplies the data voltage of the left eye image data RGB L to the data lines of the display panel 10 during the N + 1th frame period, and supplies the left eye image data RGB L to the pixels of the display panel 10. Addressing The liquid crystal shutter eyeglasses control signal receiver 130 opens the left eye shutter ST L in response to the liquid crystal shutter eyeglasses control signal C ST having a high logic. The backlight unit driver 120 turns off the light sources of the backlight unit 20 during the N + 1th frame period in response to the low logic backlight unit control signal C BLU . (S202, S203)

The timing controller 170 generates the display panel control signal C DIS during the N + 2th frame period. The timing controller 170 supplies the left eye image data RGB L to the data driving circuit during the N + 2th frame period, and maintains the liquid crystal shutter glasses control signal C ST at high logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic at the beginning of the N + 2th frame period, and T 1. The backlight unit control signal C BLU is inverted to a high logic at the time elapsed. The backlight unit controller 160 transmits a driving current of the backlight unit 20 to adjust the brightness of the backlight unit 20 to the backlight unit driver 120.

The data driving circuit supplies the data voltage of the left eye image data RGB L to the data lines of the display panel 10 during the N + 2th frame period, and supplies the left eye image data RGB L to the pixels of the display panel 10. Addressing The liquid crystal shutter eyeglasses control signal receiver 130 opens the left eye shutter ST L in response to the liquid crystal shutter eyeglasses control signal C ST having a high logic. The backlight unit driver 120 transmits T 1 from the start point of the N + 2th frame period in response to the high logic backlight unit control signal C BLU . The light sources of the backlight unit 20 are turned on from the time elapsed. The backlight unit driver 120 adjusts the brightness of the backlight unit 20 according to the driving current of the backlight unit 20 received from the backlight unit controller 160. (S204 to S207)

The timing controller 170 generates the display panel control signal C DIS during the N + 3th frame period. The timing controller 170 supplies the right eye image data RGB R to the data driving circuit during the N + 3th frame period, and generates the liquid crystal shutter glasses control signal C ST in low logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic.

The data driving circuit supplies the data voltage of the right eye image data RGB R to the data lines of the display panel 10 during the N + 3th frame period to supply the right eye image data RGB R to the pixels of the display panel 10. Addressing The liquid crystal shutter glasses control signal receiving unit 130 opens the right eye shutter ST R in response to the liquid crystal shutter glasses control signal C ST having a low logic. The backlight unit driver 120 turns off the light sources of the backlight unit 20 during the N + 3th frame period in response to the low logic backlight unit control signal C BLU . (S208, S209)

The timing controller 170 generates the display panel control signal C DIS during the N + 4th frame period. The timing controller 170 supplies the right eye image data RGB R to the data driving circuit during the N + 4th frame period, and maintains the liquid crystal shutter glasses control signal C ST in a low logic. The backlight unit controller 160 generates the backlight unit control signal C BLU with low logic at the beginning of the N + 4th frame period, and T 1. The backlight unit control signal C BLU is inverted to a high logic at the time elapsed. The backlight unit controller 160 transmits a driving current of the backlight unit 20 to adjust the brightness of the backlight unit 20 to the backlight unit driver 120.

The data driving circuit supplies the data voltage of the right eye image data RGB R to the data lines of the display panel 10 during the N + 4th frame period to supply the right eye image data RGB R to the pixels of the display panel 10. Addressing The liquid crystal shutter glasses control signal receiving unit 130 opens the right eye shutter ST R in response to the liquid crystal shutter glasses control signal C ST having a low logic. The backlight unit driver 120 transmits T 1 from the start point of the N + 4th frame period in response to the high logic backlight unit control signal C BLU . The light sources of the backlight unit 20 are turned on from the time elapsed. The backlight unit driver 120 adjusts the brightness of the backlight unit 20 according to the driving current of the backlight unit 20 received from the backlight unit controller 160. (S210 to S213)

8 and 9, T off refers to a backlight unit lighting delay time based on a time point of an N + 2 or N + 4th frame period. T off is the time until the liquid crystal of the display panel 10 reaches the target value P in response. The target value P may be set to 90% of the maximum luminance value of the display panel 10.

In FIG. 8, since the response speed of the liquid crystal increases as the temperature of the display panel 10 increases, the time for the liquid crystal of the display panel 10 to reach the target value P becomes short. Therefore, the backlight unit lighting delay time T off is shifted forward than before the temperature rises, and the backlight unit lighting time T on becomes longer. (T on → T ' on ) The backlight unit lighting time T on The start time of is accelerated as the temperature of the display panel increases.

Since the backlight unit lighting time T on becomes longer when the display panel 10 rises in temperature, the luminance of the backlight unit 20 becomes higher than before the temperature rises as shown in FIG. 8. Therefore, when the temperature of the display panel 10 rises, the driving current of the backlight unit 20 is lowered (I BLU → I ′ BLU ), so that the luminance of the display panel 10 can be kept constant.

In FIG. 9, the lower the temperature of the display panel 10 is, the lower the response speed of the liquid crystal becomes, so that the time for the liquid crystal of the display panel 10 to reach the target value P becomes longer. Therefore, the backlight unit lighting delay time T off is shifted backward than before the temperature rises, and the backlight unit lighting time T on is shortened. (T on → T ″ on ) The backlight unit lighting time T on The start time of is slowed down as the temperature of the display panel decreases.

Since the backlight unit lighting time T on becomes shorter when the display panel 10 decreases in temperature, the luminance of the backlight unit 20 is lower than before the temperature decreases as shown in FIG. 8. Therefore, when the temperature of the display panel 10 decreases, the driving current of the backlight unit 20 is increased (I BLU → I ″ BLU ), thereby reducing the luminance of the display panel 10.

10 is a block diagram illustrating a stereoscopic image display device according to a third exemplary embodiment of the present invention. Referring to FIG. 10, the backlight unit 20 may be divided into first to Mth blocks (M is an integer of 2 or more). Each block may be divided into the same size. In FIG. 10, as an embodiment of the present invention, the backlight unit 20 is divided into first to fourth blocks Block 1, 2, 3, and 4.

The look-up table 60 stores data regarding the timing of turning on the backlight unit of each of the first to fourth blocks predetermined at an optimum timing according to the temperature of the display panel 10 and the temperature of the display panel 10. have. The backlight unit lighting timing data D T of each of the first to fourth blocks is determined through experiments on the change in response characteristics of the liquid crystal according to the temperature change of the display panel 10. In connection with this, it mentions later.

The look-up table 60 receives the temperature of the display panel 10 from the temperature compensation circuit 150 as an input address and outputs backlight unit lighting timing data D T of each of the first to fourth blocks stored at the address. Choose. The look-up table 60 transmits the selected backlight unit lighting timing data D T to the temperature compensation circuit 150.

The temperature compensation circuit 150 receives the backlight unit lighting timing data D T of each of the first to fourth blocks from the look-up table 60, and turns on the backlight unit lighting timing data of each of the first to fourth blocks. D T ) is transmitted to the backlight unit controller 160.

The backlight unit controller 160 receives the backlight unit lighting timing data D T of each of the first to fourth blocks from the temperature compensation circuit 150, and receives the frame count signal and the line count signal from the timing controller 170. do. The backlight unit controller 160 controls the frame period and the unlit periods of each of the first to fourth blocks through the frame counter signal, the line counter signal, and the backlight unit lighting timing data D T of each of the first to fourth blocks. You can judge.

The backlight unit controller 160 outputs the backlight unit control signals C BLU1 to C BLU4 of each of the first to fourth blocks to the backlight unit driver 120. The backlight unit control signals C BLU1 to C BLU4 of each of the first to fourth blocks control the backlight unit driver 120 to periodically turn on and off the light sources of each of the first to fourth blocks as shown in FIG. 12. .

In addition, another description of the stereoscopic image display device according to the third embodiment of the present invention is the same as FIG. 2.

11 is a flowchart illustrating a method of driving a stereoscopic image display device according to a third embodiment of the present invention, and FIG. 12 illustrates a response characteristic of a liquid crystal and driving of the backlight unit 20 according to a third embodiment of the present invention. It is a waveform diagram. This will be described in detail with reference to the stereoscopic image display device illustrated in FIG. 10.

Referring to FIG. 11, the temperature sensor 50 detects a temperature of the display panel 10. The temperature sensor 50 converts the sensed temperature of the display panel 10 into an electrical signal T P and transmits the temperature to the temperature compensation circuit 150. The temperature transmitted by the temperature sensor 50 may be an average value of one frame period or may be a temperature at that time. (S301)

The timing controller 170 generates the display panel control signal C DIS during the N + 1th frame period. The timing controller 170 supplies the left eye image data RGB L to the data driving circuit during the N + 1th frame period, and generates the liquid crystal shutter glasses control signal C ST in low logic. The backlight unit controller 160 generates the backlight unit control signal C BLU of the first block with low logic, and sequentially generates the backlight unit control signal C BLU of the second to fourth blocks with high logic.

The data driving circuit supplies the data voltage of the left eye image data RGB L to the data lines of the display panel 10 during the N + 1th frame period, and supplies the left eye image data RGB L to the pixels of the display panel 10. Addressing The liquid crystal shutter glasses control signal receiving unit 130 opens the right eye shutter ST R in response to the liquid crystal shutter glasses control signal C ST having a low logic.

The backlight unit driver 120 turns off the light sources of the first block during the N + 1 frame period in response to the backlight unit control signal C BLU of the first block of the low logic. The backlight unit driver 120 sequentially turns on the light sources of the second to fourth blocks in response to the backlight unit control signal C BLU of the second to fourth blocks of the high logic.

In detail, as illustrated in FIG. 12, the backlight unit driver 120 inverts the backlight unit control signal C BLU of the second block to a high logic at a time point that elapses by W 2 from the start point of the Nth frame period. The backlight unit driver 120 inverts the backlight unit control signal C BLU of the third block to a high logic at a time point elapsed by W 3 from the start point of the Nth frame period. The backlight unit driver 120 inverts the backlight unit control signal C BLU of the fourth block to high logic at a time point that elapses by W 4 from the start point of the Nth frame period.

The backlight unit driver 120 turns off the light sources of the second block before or at the same time as the light sources of the third block are turned on. The backlight unit driver 120 turns off the light sources of the third block before or while the light sources of the fourth block are turned on. (S302, S303)

The timing controller 170 generates the display panel control signal C DIS during the N + 2th frame period. The timing controller 170 supplies the left eye image data RGB L to the data driving circuit during the N + 2th frame period, and generates the liquid crystal shutter glasses control signal C ST in high logic. The backlight unit controller 160 generates the backlight unit control signal C BLU in low logic at the beginning of the N + 2th frame period, and W 1. At this point, the backlight unit control signal C BLU of the first block is inverted to high logic.

The data driving circuit supplies the data voltage of the left eye image data RGB L to the data lines of the display panel 10 during the N + 2th frame period, and supplies the left eye image data RGB L to the pixels of the display panel 10. Addressing The liquid crystal shutter eyeglasses control signal receiver 130 opens the left eye shutter ST L in response to the liquid crystal shutter eyeglasses control signal C ST having a high logic.

The backlight unit driver 120 W 1 from the start point of the N + 2th frame period in response to the high logic backlight unit control signal C BLU . The light sources of the first block are turned on from the elapsed time. The backlight unit driver 120 turns off the light sources of the first block before or at the beginning of the N + 3th frame period. (S304, S305)

The timing controller 170 generates the display panel control signal C DIS during the N + 3th frame period. The timing controller 170 supplies the right eye image data RGB R to the data driving circuit during the N + 3th frame period, and maintains the liquid crystal shutter glasses control signal C ST at high logic. The backlight unit controller 160 generates the backlight unit control signal C BLU of the first block with low logic, and sequentially generates the backlight unit control signal C BLU of the second to fourth blocks with high logic.

The data driving circuit supplies the data voltage of the right eye image data RGB R to the data lines of the display panel 10 during the N + 3th frame period to supply the right eye image data RGB R to the pixels of the display panel 10. Addressing The liquid crystal shutter eyeglasses control signal receiver 130 opens the left eye shutter ST L in response to the liquid crystal shutter eyeglasses control signal C ST having a high logic.

The backlight unit driver 120 turns off the light sources of the backlight unit 20 of the first block during the N + 3 frame period in response to the backlight unit control signal C BLU of the first block of the low logic. The backlight unit driver 120 sequentially turns on the light sources of the second to fourth blocks in response to the backlight unit control signal C BLU of the second to fourth blocks of the high logic.

In detail, as illustrated in FIG. 12, the backlight unit driver 120 inverts the backlight unit control signal C BLU of the second block to a high logic at a time when W 2 has elapsed from the start point of the N + 2th frame period. The backlight unit driver 120 inverts the backlight unit control signal C BLU of the third block to a high logic at a time when W 3 has elapsed from the start point of the N + 2th frame period. The backlight unit driver 120 inverts the backlight unit control signal C BLU of the fourth block to a high logic at a time point that elapses by W 4 from the start point of the N + 2 frame period.

The backlight unit driver 120 turns off the light sources of the second block before or at the same time as the light sources of the third block are turned on. The backlight unit driver 120 turns off the light sources of the third block before or while the light sources of the fourth block are turned on. (S306, S307)

The timing controller 170 generates the display panel control signal C DIS during the N + 4th frame period. The timing controller 170 supplies the right eye image data RGB R to the data driving circuit during the N + 4th frame period, and generates the liquid crystal shutter glasses control signal C ST with low logic. The backlight unit controller 160 generates the backlight unit control signal C BLU with low logic at the beginning of the N + 4th frame period, and W 1. At this point, the backlight unit control signal C BLU of the first block is inverted to high logic.

The data driving circuit supplies the data voltage of the right eye image data RGB R to the data lines of the display panel 10 during the N + 4th frame period to supply the right eye image data RGB R to the pixels of the display panel 10. Addressing The liquid crystal shutter glasses control signal receiving unit 130 opens the right eye shutter ST R in response to the liquid crystal shutter glasses control signal C ST having a low logic.

The backlight unit driver 120 W 1 from the start of the N + 4th frame period in response to the high logic backlight unit control signal C BLU . The light sources of the first block are turned on from the elapsed time. The backlight unit driver 120 turns off the light sources of the first block before or at the beginning of the N + 5th frame period. (S308, S309)

Referring to FIG. 12, since the left and right eye image data are sequentially scanned from the top of the display panel 10, the response waiting time of the liquid crystal of the display panel 10 may be different from the top and bottom of the display panel 10. do. To overcome this, the backlight unit 20 is divided into blocks, and each block is turned on in accordance with the rising period of the liquid crystal of the display panel 10 facing each block.

Referring to FIG. 12, W 1 to W 4 are backlight on delay times of respective blocks reaching the target luminance of each block. Specifically, W 1 to W 4 are lighting delay times of respective blocks sequentially delayed based on the start point of the N + 2 or N + 4th frame period. When the backlight unit 20 is divided into first to Mth blocks, W 1 to W M are backlight unit lighting delay times of the first to Mth blocks.

When the backlight unit 20 is sequentially driven by dividing the backlight unit 20 into blocks, when the upper block is turned on, light interference may occur in which light of the upper block partially reaches other lower blocks. If there is optical interference, the optimized backlight unit lighting timing of each block may change according to the amount of interference.

13 is a graph showing the ratio of 3D crosstalk according to the backlight unit driving method. 14 is a view illustrating a driving method of the blinking backlight unit of FIG. 13, and FIG. 15 is a view illustrating a driving method of the scanning backlight unit of FIG. 13.

Blinking refers to driving the backlight unit 20 simultaneously as a whole without dividing it into blocks. In the blinking driving method, as shown in FIG. 14, all of the light sources of the backlight unit 20 are turned on at the same time. Scanning refers to driving each block sequentially by dividing the backlight unit 20 into blocks. The scanning driving method is sequentially turned on from the uppermost block as shown in FIG.

13 is a graph measuring the 3D crosstalk ratio according to the driving method of the backlight unit 20 under the same temperature condition. In the graph of FIG. 13, the X axis represents the ratio of 3D crosstalk and the Y axis represents the measurement position of the display panel 10. In the case of the blinking driving method, the 3D crosstalk ratio of the upper part of the display panel 10 was measured very high, and the upper, middle, and lower parts showed a lot of variation. In the scanning driving method, 3D crosstalk was measured at a ratio of about 13% to 14% at the top, center, and bottom of the display panel 10. Therefore, the scanning driving method has a lower 3D crosstalk ratio than the blinking driving method.

As can be seen from the graph of FIG. 13, it is important at which timing to turn on the light sources of the backlight unit 20 even under the same temperature conditions. When the temperature of the display panel 10 is changed, since the reaction speed of the liquid crystal of the display panel 10 is changed, it should be adjusted to the timing of lighting the backlight unit optimized according to the temperature of the display panel 10.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the present invention should not be limited to the details described in the detailed description, but should be defined by the claims.

10: display panel 20: backlight unit
30: liquid crystal shutter glasses 50: temperature sensor
60: look-up table
110: display panel driver 120: backlight unit driver
130: liquid crystal shutter glasses control signal receiver
140: liquid crystal shutter glasses control signal transmission unit
150: temperature compensation circuit 160: backlight unit controller
170: timing controller 180: system board
ST L : Left Eye Shutter ST R : Right Eye Shutter
C ST : LCD shutter glasses control signal T P : Temperature signal of display panel
D T : Backlight unit lighting timing data
D I : Backlight unit drive current data
C BLU : Backlight Unit Control Signal
T off : Backlight unit lighting delay time
T on : Backlight unit lighting time
I BLU : Backlight Unit Driving Current

Claims (20)

A display panel displaying a stereoscopic image;
A backlight unit radiating light onto the display panel;
A temperature sensor detecting a temperature of the display panel; And
And a backlight unit controller configured to adjust a backlight unit lighting time in response to temperature data input from the temperature sensor. The method of claim 1,
The display panel,
The left eye image is displayed during the N + 1 (N is a natural number) and the N + 2 frame periods, and the right eye image is displayed during the N + 3 and N + 4 frame periods. The method of claim 1,
The backlight unit controller,
And a temperature compensation circuit including a look-up table for storing the temperature data and the backlight unit lighting time data that vary according to the temperature data. The method of claim 3, wherein
The backlight unit controller,
And a backlight unit control signal for controlling the backlight unit through the backlight unit lighting time data. The method of claim 4, wherein
And the look-up table stores driving current data for adjusting brightness of the backlight unit, which is changed according to the temperature data. The method of claim 5, wherein
The backlight unit controller,
And outputting the driving current data together with the backlight unit control signal. The method according to claim 6,
And a backlight unit driver to turn on and off light sources of the backlight unit in response to the backlight unit control signal. The method of claim 7, wherein
And the backlight unit driver adjusts brightness of light sources of the backlight unit in response to the driving current data. The method of claim 1,
The backlight unit lighting time is longer as the temperature of the display panel is increased, and shorter as the temperature of the display panel is lowered. The method of claim 9,
The start point of the backlight unit lighting time is faster as the temperature of the display panel rises, and slower as the temperature of the display panel decreases. A display panel displaying a stereoscopic image;
A backlight unit radiating light onto the display panel;
A temperature sensor detecting a temperature of the display panel; And
And a backlight unit controller configured to adjust a backlight unit lighting time in response to temperature data input from the temperature sensor.
The backlight unit may be divided into at least two blocks along the data scan direction of the display panel, and the blocks may be sequentially turned on in the scan direction of the data by turning on light sources of the backlight unit. Stereoscopic Display. The method of claim 11,
The display panel,
The left eye image is displayed during the N + 1 (N is a positive integer) and the N + 2 frame periods, and the right eye image is displayed during the N + 3 and N + 4 frame periods. . The method of claim 11,
The backlight unit controller,
And a temperature compensation circuit including a look-up table for storing the temperature data and the backlight unit lighting time data of each of the blocks that vary according to the temperature data. The method of claim 13,
The backlight unit controller,
And a backlight unit control signal for controlling each of the blocks through the backlight unit lighting time data. The method of claim 14,
And the look-up table stores driving current data for adjusting brightness of each of the blocks that are varied according to the temperature data. The method of claim 15,
The backlight unit controller,
And outputting the driving current data together with the backlight unit control signals. 17. The method of claim 16,
And a backlight unit driver to turn on and off light sources of each of the blocks in response to the backlight unit control signals. The method of claim 17,
And the backlight unit driver adjusts brightness of light sources of each of the blocks in response to the driving current data. The method of claim 11,
The backlight unit lighting time of each of the blocks is longer as the temperature of the display panel is increased, and shorter as the temperature of the display panel is lowered. The method of claim 19,
And a start time point of the backlight unit lighting time of each of the blocks is faster as the temperature of the display panel rises and is slower as the temperature of the display panel decreases.
KR1020100041299A 2010-05-03 2010-05-03 Stereoscopic image display device KR20110121826A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130037005A (en) * 2011-10-05 2013-04-15 엘지디스플레이 주식회사 Stereoscopic image display
US9196220B2 (en) 2012-06-22 2015-11-24 Samsung Display Co., Ltd. Three-dimensional image display apparatus and method of driving the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130037005A (en) * 2011-10-05 2013-04-15 엘지디스플레이 주식회사 Stereoscopic image display
KR101868611B1 (en) * 2011-10-05 2018-06-20 엘지디스플레이 주식회사 Stereoscopic image display
US9196220B2 (en) 2012-06-22 2015-11-24 Samsung Display Co., Ltd. Three-dimensional image display apparatus and method of driving the same

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