KR101689666B1 - Apparatus and method for three- dimension liquid crystal display device - Google Patents

Abstract

The present invention relates to a 3D liquid crystal display device implementing a 3D image using a shutter glass and a driving method thereof. The counter of the 3D liquid crystal display of the present invention counts image data frames separated by the left eye image and the right eye image to generate frame count information of the image data, counts the frame lines of the displayed image, Generate. The image selecting unit of the 3D liquid crystal display of the present invention selects the left eye image data and the right eye image data from the memory so that the left eye image and the right eye image are continuously displayed in units of frames based on the frame count information of the image data. A method of driving a 3D liquid crystal display of the present invention includes separating input image data into left eye image data and right eye image data, counting frames and lines of separated image data, counting a left eye image and a right eye image, Selecting in frame units and displaying them consecutively, and controlling the operation of the left and right eye shutters.

Description

TECHNICAL FIELD [0001] The present invention relates to a 3D liquid crystal display device and a driving method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD), and more particularly, to a 3D liquid crystal display and a driving method capable of improving the display quality of a 3D image by improving crosstalk and flicker in realizing a 3D image using a shutter glass .

The display devices have been developed in accordance with the demand for enlargement and thinness. Demand for flat panel display devices having the advantages of large size, thin film, light weight, and low power consumption is increasing.

Examples of flat panel display devices include a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), a light emitting diode (LED) Diode Display Device) are continuously being developed.

Of these flat panel display devices, liquid crystal display devices are being applied to a variety of applications due to advantages of mass production technology, ease of driving means, high image quality and large screen realization.

The liquid crystal display includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form, a backlight unit for supplying light to the liquid crystal panel, and a driving circuit for driving the liquid crystal panel.

The liquid crystal cells of the liquid crystal panel are defined by intersections of a plurality of gate lines and a plurality of data lines, and pixel electrodes and common electrodes for applying an electric field are formed in each liquid crystal cell. Each of the liquid crystal cells is switched through a thin film transistor (TFT).

A gate driver (G-IC) for supplying a scan signal to the gate lines; A data driver (D-IC) for supplying a data voltage according to a video signal to the data lines; A timing controller (T-con) for supplying a control signal to the gate driver and the data driver and supplying image data to the data driver; And a backlight driver for driving a light source (backlight) of the backlight unit that supplies light to the liquid crystal panel.

In such a liquid crystal display device, the arrangement state of the liquid crystal is changed according to the voltage formed between the pixel electrode and the common electrode for each liquid crystal cell, and the image is displayed by adjusting the transmittance of the light supplied from the backlight unit through the arrangement of the liquid crystal.

2. Description of the Related Art In recent years, users' demands for realistic images have increased, and liquid crystal display devices capable of realizing not only 2D (two-dimensional) images but also 3D (three-dimensional) images have been developed.

[0002] A liquid crystal display device for displaying 3D images generally implements a 3D image using a binocular parallax display, and a shutter glass method using special glasses for stereoscopic use, a lenticular lens method , A patterned retarder method using polarizing glasses, and the like have been proposed.

1 and 2 are views showing a 3D image realizing method of a liquid crystal display device using a shutter glass method according to the related art.

Referring to FIGS. 1 and 2, a method of implementing a 3D image using a shutter glass 20 according to the related art uses a binocular disparity of a user. The 3D image is divided into two different left-eye and right- After the image is recognized, the two two-dimensional images (the left eye image and the right eye image) are merged to be recognized as a three-dimensional image to the viewer.

To this end, the liquid crystal panel 10 displays 2D images of the left and right eyes with a time lag. At this time, the recognition of the right-eye 2D image is blocked while the left-eye 2D image is displayed through the shutter glass 20, and the 2D image is recognized in the left eye. During the period in which the right-eye 2D image is displayed, the recognition of the left-eye 2D image is blocked, and the 2D image is recognized in the right eye.

Through this, different 2D images are recognized with a time lag in the left eye and right eye, and then the 2D images of the left eye and the right eye are fused to allow the user to recognize the 3D image.

The liquid crystal display according to the above-described conventional technique alternately displays the 2D image of the left eye and the right eye for a predetermined time (frame), and implements a 3D image through on-off of the shutter glass 20. [

However, due to the slow response speed characteristics and the hold-type characteristics of the liquid crystal formed on the liquid crystal panel 10, the rise and fall of the liquid crystal do not completely end during a predetermined time (frame).

The shutter glass is also switched through the liquid crystal. The response time of the liquid crystal is slow, so that even when the shutter glass turns off at the end of the vertical period, the shutter glass is not completely closed. This causes a difference in the response speed of the liquid crystal between the upper end portion and the lower end portion of the liquid crystal panel 10, resulting in a problem of uneven brightness.

Particularly, the liquid crystal display device requires a certain time to display a new frame stably on the screen due to the characteristic of the response speed of the liquid crystal. Therefore, when a 3D image in which a left-eye image and a right-eye image are overlapped without being completely separated, that is, a crosstalk occurs and a display quality of a 3D image is deteriorated and a crosstalk phenomenon occurs is viewed for a long time, There is a problem that can appear.

In addition, there is a problem that the light around the viewer (for example, the fluorescent light of the living room) may interfere with the shutter glass, causing a flicker phenomenon in which the screen to be watched blinks, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a 3D liquid crystal display device and a driving method capable of improving the display quality of a 3D image.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device and a driving method capable of improving the crosstalk and improving the display quality of a 3D image.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device and a driving method capable of improving the display quality of a 3D image by improving a flicker.

The 3D liquid crystal display device according to the present invention counts image data frames separated into a memory, a left eye image, and a right eye image, which separates input image data into left eye image data and right eye image data, A counter for generating count information and counting a frame line of an image to be displayed to generate line count information; a counter for counting the number of frame images of the left eye image and the right eye image based on the frame count information of the image data; A shutter glass control unit for controlling the operations of the left eye and right eye shutter based on the selection of the left eye image and the right eye image data in the image selecting unit and a left eye image of the image selecting unit, Selection of data and right eye image data In units of frames of the predetermined number referred to it is characterized in that it comprises a liquid crystal panel that displays a left eye image and right-eye images.

A method of driving a 3D LCD according to an embodiment of the present invention includes separating input image data into left eye image data and right eye image data, counting frames and lines of image data separated into a left eye image and a right eye image Eye image and a right-eye image on a frame-by-frame basis, based on a frame and a line count result of the image data, and displaying the left-eye image and the right- And controlling the operation of the right-eye shutter.

The present invention can improve the display quality of the 3D image realized in the 3D liquid crystal display device.

The present invention can improve the display quality of 3D images by improving the crosstalk according to the implementation of the 3D image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to improve the display quality of a 3D image by improving a flicker in the realization of a 3D image.

1 and 2 are views showing a 3D image realizing method of a liquid crystal display device using a shutter glass method according to the related art.
3 is a view schematically showing a 3D liquid crystal display device according to an embodiment of the present invention.
4 is a diagram illustrating a video controller of a 3D liquid crystal display according to an embodiment of the present invention.
5 is a diagram illustrating a 3D image implementation method according to a first embodiment of the present invention.
6 is a diagram illustrating a 3D image realizing method according to a second embodiment of the present invention.

Hereinafter, a 3D liquid crystal display and a driving method according to embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a view schematically showing a 3D liquid crystal display device according to an embodiment of the present invention, and FIG. 4 is a view illustrating an image control part of a 3D liquid crystal display device according to an embodiment of the present invention.

3 and 4, the 3D liquid crystal display 100 according to the embodiment of the present invention includes a liquid crystal panel 110; A gate driver 120; A data driver 130; A backlight unit 140; A backlight driving unit 150; A timing controller 160; And an image control unit 200. Here, the image controller 200 may be implemented in the timing controller 160.

The liquid crystal panel 110 includes a plurality of gate lines G1 to Gn and a plurality of data lines D1 to Dm and a liquid crystal cell Clc (not shown) formed for each region defined by intersection of the gate lines and the data lines. , Pixel regions).

The liquid crystal cells include a thin film transistor (TFT) and a storage capacitor (Cst) formed at intersections of gate lines and data lines.

The thin film transistor (TFT) supplies an analog data signal (data voltage) supplied through the data lines to the liquid crystal cells in response to a scan signal supplied through the gate lines.

The gate driver 120 generates a scan signal (gate drive signal) for driving the thin film transistor (TFT) formed in each liquid crystal cell based on a gate control signal (GCS) from the timing controller 160 And sequentially drives the generated scan signal to the gate lines G1 to Gn of the liquid crystal panel 110 to drive (switch) the thin film transistor TFT.

The data driver 130 converts the digital image data (R, G, B) supplied from the timing controller 160 into an analog data signal (data voltage). The converted analog data signal is supplied to each of the data lines in response to a data control signal (DCS) from the timing controller 160. That is, an analog data signal is supplied to each of the liquid crystal cells turned on by the scan signal.

The digital image data R, G, and B supplied to the data driver 130 include left eye image data and right eye image data arranged by the image controller 200 according to an embodiment of the present invention .

The timing controller 160 generates a gate control signal GCS for controlling the gate driver 120 and control of the data driver 130 using the vertical / horizontal synchronization signal Vsync / Hsync and the clock signal CLK And generates a data control signal DCS. The generated gate control signal GCS is supplied to the gate driver 120 and the data control signal DCS is supplied to the data driver 130.

The data control signal DCS includes a source start pulse SSP, a source sampling clock SSC, a source output enable SOE, and a polarity control signal POL, Polarity) and the like.

The gate control signal GCS may include a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable (GOE).

In addition, the timing controller 160 aligns the video signals from the outside, converts them into digital video data (R, G, B) on a frame basis, and supplies the digital video data aligned on a frame-by-frame basis to the data driver 130 . Here, the digital image data R, G, and B include left eye image data and right eye image data arranged by the image controller 200 according to an embodiment of the present invention described below.

Since the liquid crystal panel 110 does not generate self-luminescence, an image (image) is displayed using light supplied from the backlight unit 140.

The backlight unit 140 can be divided into an edge type in which a backlight is disposed in a lateral direction of the liquid crystal panel 110 and a direct type in which a backlight is disposed in a back direction of the liquid crystal panel 110, .

The backlight unit 140 is for emitting light to the liquid crystal panel 110. The backlight unit 140 includes a plurality of backlight CCFLs (EEFL: External Electrode Fluorescent Lamp) And an optical member (a light guide plate, a diffusion plate, and an optical sheet) for guiding light generated in the backlight toward the liquid crystal panel 110 and improving light efficiency.

The backlight driver 150 drives the light source according to a backlight control signal (BCS) input from the image controller 200. Here, the backlight driver 150 may control the on-off state of the backlight and the driving frequency according to the backlight control signal BCS. In addition, the brightness of the backlight can be controlled so that the image displayed on the liquid crystal panel 110 can be clearly expressed.

The image controller 200 is inputted to the timing controller 160 to improve the crosstalk and flicker due to the delay characteristics of the liquid crystal formed in the liquid crystal panel 110 and the shutter glass when the 3D image is implemented, And controls digital image data.

For example, in implementing a 3D image, the left eye image may be displayed for three frames or four frames in the liquid crystal panel 110, and then the right eye image may be displayed for three or four frames. do.

In addition, in order to obtain a response margin of the liquid crystal, a left eye image and a right eye image are displayed in consecutive three or four frame units, and in a continuous three or four frame period, (Off), and drives the backlight so that the time when the backlight is turned on (i.e., duty) is different from each other.

For example, the left eye image and the right eye image may be displayed in units of four frames (N frames to N + 3 frames may display a left eye image, and N + 4 frames to N + 7 frames may display right eye images). At this time, the backlight is turned off in the first frame and the third frame, and the backlight is turned on in the second frame and the fourth frame. Further, the periods during which the backlight is turned on are made different from each other, thereby improving the occurrence of the flicker phenomenon.

The image controller 200 includes a memory 210, an image selector 220, a shutter glass controller 230, and a counter 240 as shown in FIG.

The memory 210 may be implemented as a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory), and separates frame-based image data including a left eye image and a right eye image into a left eye image and a right eye image. The image data separated into the left eye and the right eye is provided to the image selection unit 220.

Here, the required capacity and form of the memory 210 may vary according to the format of the image data. If the image data is a top-down format, a frame-type memory is applied. If the image data is a side-by-side format A line-shaped memory can be applied.

The image selection unit 220 supplies the left eye image data and the right eye image data to the data driver 130 in units of a predetermined number of consecutive frames based on the image data frame count information from the counter 240 described later. Accordingly, the left eye image and the right eye image are displayed on the liquid crystal panel 110 for a predetermined number of consecutive frames.

As shown in FIG. 5, the image selector 220 may display a left eye image for four frames, and then display a right eye image for four frames.

As another example, the image selecting unit 220 may display the left eye image for three frames, and then display the right eye image for three frames, as shown in FIG.

The counter 240 counts the image data frames supplied to the image selector 220 separated from the left eye and the right eye in the memory 210 and outputs the frame count information of the image data to the image selector 220.

5, when a right eye image of four consecutive frames (N + 4th frame to N + 7th frame) and a left eye image of 4 consecutive frames (N frame to N + 3 frame) , The frame of the image data is counted in units of 8 frames in total (4 frames each in the left eye and right eye) (000 -> 001 -> 010 -> 011 -> 100 -> 101 -> 110 -> 111 -> 000, ), And provides the count information to the image selection unit 220.

Also, the counter 240 counts a frame line of an image displayed on the liquid crystal panel 110. Generates a backlight control signal (BCS) for on-off control of the backlight based on the frame counter information of the image data and the line count information, and supplies the generated backlight control signal to the backlight driving unit 150 do.

Also, the counter 240 generates the backlight control signal so that the backlight is turned on / off after a predetermined time has elapsed according to the vertical synchronization (V-sync) and the response speed of the liquid crystal.

5, a right eye image of four consecutive frames (N + 4th frame to N + 7th frame) and a left eye image of 4 consecutive frames (N frame to N + 3 frame) It can be driven as follows.

When the count of the frame is the N + 1 frame or the N + 3 frame, that is, when the second frame image of the left eye or the fourth frame image of the left eye is supplied, the backlight control signal is corrected based on the line count and the response speed of the liquid crystal .

Specifically, the backlight control signal is generated so that the time when the line count is performed is greater than the time T1 when the liquid crystal array is completed and the left eye image or the right eye image is stabilized.

Here, the time when the backlight is turned on when the frame count is supplied to the N + 1 frame, the N + 3 frame, that is, the second frame image of the left eye and the fourth frame image of the left eye are different from each other, It is possible to make the time for turning on the backlight on (N + 3) frame longer than that for the frame.

As another example, the counter 240 may generate three consecutive frames (N + 3 frame to N + 5 frame) with consecutive three frames (N frame to N + 2 frame) ) Can be driven as follows.

 (000 -> 001 -> 010 -> 011 -> 100 -> 101 -> 000, ...) in units of a total of 6 frames in each of the left eye and right eye three frames, And provides it to the selection unit 220.

6, when a left eye image of three consecutive frames (N frame to N + 2 frame) and a right eye image of three consecutive frames (N + 3 frame to N + 5 frame) When the count of the frame is the N + 1 frame or the N + 2 frame, that is, when the second frame image of the left eye or the third frame image of the left eye is supplied, the backlight control signal .

Specifically, a backlight control signal is generated so that the time when the line count is performed is greater than the time T2 when the liquid crystal array is completed and the black image of the left eye or the black image of the right eye is stabilized do.

Here, the time when the backlight is turned on when the frame count is supplied to the N + 1 frame, the N + 2 frame, that is, the second frame image of the left eye and the third frame image of the left eye are different from each other, It is possible to make the time for turning on the backlight on (N + 2) frame longer than that for the frame.

When the image to be displayed on the liquid crystal panel 110 is a 3D image based on the 2D mode / 3D mode input, the shutter glass control unit 230 controls the shutter glass control for controlling the shutter glass so that the user can recognize the 3D image. (SCS), and supplies the generated shutter glass control signal SCS to the shutter glass.

To this end, the shutter glass control unit 230 includes means (module) for generating and transmitting a shutter glass control signal SCS, and the shutter glass control signal SCS is supplied to the shutter glass through a wired or wireless medium Can be provided. At this time, the shutter glass control signal SCS may be generated and transmitted using the vertical / horizontal synchronization signal Vsync / Hsync.

When the left eye image is displayed on the basis of the selection of the left eye image and the right eye image in the image selection unit 220, the shutter glass control unit 230 opens the left shutter and the right eye image is displayed The shutter glass control signal is generated so that the right shutter is opened. At this time, the shutter glass control signal may be generated such that the shutter glass is driven at 30 Hz, 60 Hz, 40 Hz, or 80 Hz.

The shutter glass is driven in accordance with the shutter glass control signal SCS (right eye and left eye glass on-off) so that the image displayed on the liquid crystal panel 110 is recognized as a 3D image by the user.

As an example, the shutter glass may be driven in synchronism with the implementation frequency of the image, and may be driven at 30 Hz and 60 Hz in accordance with the shutter glass control signal. At this time, the left and right eye shutters are opened or closed differently from each other. That is, the left-eye shutter and the right-eye shutter are not opened or closed together.

As another example, the shutter glass may be driven at 40 Hz and 80 Hz in accordance with the shutter glass control signal, at which time the left and right eye shutters are not opened or closed together.

The 3D liquid crystal display device and the driving method according to the embodiment of the present invention including the above-described configuration can improve the crosstalk and the flicker to improve the display quality of the 3D image.

In the above description, the image controller 200 is embodied in the timing controller 160, but this is an example. In another embodiment of the present invention, the image controller 200 is separately provided in the LCD controller 100 As shown in FIG.

In the description of the driving method of the 3D liquid crystal display device according to the embodiment of the present invention, the left eye image and the right eye image are displayed through three consecutive frames or four consecutive frames. However, Some of the embodiments have been described. Therefore, the number of consecutive frames, the on-off timing of the backlight and the duty of on-off, and the driving frequency of the shutter glass can be freely changed within the scope of the present invention.

It will be understood by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: liquid crystal display device 110: liquid crystal panel
120: gate driver 130: data driver
140: backlight unit 150: backlight driving unit
160: timing controller 200:
210: memory 220: image selector
230: shutter glass controller 240: counter

Claims (10)

A memory for separating input image data into left eye image data and right eye image data;
A counter counting image data frames separated by the left eye image and the right eye image to generate frame count information of the image data, counting frame lines of the displayed image, and generating line count information;
An image selector for selecting left eye image data and right eye image data from the memory so that the left eye image and the right eye image are continuously displayed in units of a predetermined number of frames based on the frame count information of the image data;
A shutter glass control unit for controlling operations of a left eye shutter and a right eye shutter based on the selection of the left eye image and the right eye image data in the image selection unit; And
And a liquid crystal panel for displaying a left eye image and a right eye image on a frame-by-frame basis in accordance with the selection of the left eye image data and the right eye image data of the image selection unit,
Wherein the counter is a 3D liquid crystal display for turning on the backlight after a preset time has elapsed based on a response speed of the liquid crystal in a frame excluding the first frame after the left eye image and the right eye image data are inputted by the image selecting unit Device. The apparatus of claim 1, wherein the image selector
Eye image data and right-eye image data from the memory so that the left-eye image or the right-eye image is continuously displayed for at least three frames. The apparatus of claim 1, wherein the counter
Off state of the backlight based on the vertical synchronization (V-sync) and the response speed of the liquid crystal. 4. The apparatus of claim 3, wherein the counter
Controls driving of the backlight so that the backlight is turned on when the line count is greater than a preset time based on a response speed of the liquid crystal,
Wherein the predetermined time based on the response speed of the liquid crystal is a time at which the left eye image or the right eye image is stabilized. 4. The apparatus of claim 3, wherein the counter
Controls driving of the backlight so that the backlight is turned on when the line count is greater than a preset time based on a response speed of the liquid crystal,
Wherein the predetermined time based on the response speed of the liquid crystal is a time at which the black image of the left eye or the black image of the right eye is stabilized. The method according to claim 4 or 5,
Wherein driving of the backlight is controlled such that a time and a period of time in which the backlight is turned on are different in a frame of a continuous left eye image or a right eye image. Separating the inputted image data into left eye image data and right eye image data;
Counting frames and lines of image data separated into a left eye image and a right eye image;
Selecting and displaying a left eye image and a right eye image on a frame-by-frame basis based on a frame and a line count result of the image data;
Controlling operations of a left eye shutter and a right eye shutter to correspond to a left eye image and a right eye image displayed in a predetermined number of frames; And
And turning on the backlight after a predetermined time has elapsed based on the response speed of the liquid crystal in a frame excluding the first frame after the left eye image data and the right eye image data are input. Way. 8. The method of claim 7,
When displaying the left eye image or the right eye image during four consecutive frames,
In the second frame image or the fourth frame, the backlight is turned on when the time at which the line count is performed is greater than a preset time based on the response speed of the liquid crystal,
Wherein the predetermined time based on the response speed of the liquid crystal is a time at which the left eye image or the right eye image is stabilized. 8. The method of claim 7,
When displaying the left eye image or the right eye image during three consecutive frames,
The backlight is turned on when the time of performing the line count is greater than a preset time based on the response speed of the liquid crystal in the second frame image or the third frame,
Wherein the predetermined time based on the response speed of the liquid crystal is a time at which the black image of the left eye or the black image of the right eye is stabilized. 8. The method of claim 7,
The left shutter and the right shutter of the shutter glass are driven at 30 Hz, 40 Hz, 60 Hz, and 80 Hz so as to correspond to the left eye image or the right eye image continuously displayed for at least three frames.

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