KR20080062922A - Driving method for three dimensional image display device - Google Patents

Abstract

A method for driving a three dimensional image display device is provided to improve an image quality of a 2D image by suppressing an effect of a remaining 3D image. A display panel(100) includes plural unit pixels having plural sub-pixels. An image signal generator(200) supplies a 2D or 3D image signal to the respective sub-pixels. A calculator(400) calculates brightness for the respective sub-pixels corresponding to the 2D or 3D image signal. A brightness voltage generator(300) supplies signal voltages to the plural sub-pixels according to the calculated brightness. When the 3D image signal is converted to the 2D image signal, the calculator determines the brightness for the sub-pixel by using a reference mathematical expression based on the brightness for the plural sub-pixels in the unit pixel.

Description

DRIVING METHOD FOR THREE DIMENSIONAL IMAGE DISPLAY DEVICE}

1 is a schematic diagram illustrating a conventional stereoscopic image display device;

2 and 3 are views for explaining the configuration of a stereoscopic image display device according to the present invention;

4 is a block diagram for explaining the configuration of a stereoscopic image display device according to the present invention;

5 is a view for explaining the effect of the three-dimensional image display device according to the present invention.

Explanation of Signs of Major Parts of Drawings

10: slit barrier 11: slit

12 barrier 100 display panel

200: video signal generator 300: luminance voltage generator

  400: calculation unit

The present invention relates to a driving method of a three-dimensional image display device, and more particularly, to improve the image quality by minimizing the effect of the remaining three-dimensional stereoscopic image when converted from the three-dimensional stereoscopic image to the two-dimensional flat image The present invention relates to a driving method of a stereoscopic image display device capable of realizing a planar image of a dimension.

One of the most commonly used methods for implementing a stereoscopic display technology is a method using binocular display. The method of using bilateral parallax is to express the image taken by the camera corresponding to the left eye and the image taken by the camera corresponding to the right eye on the same display module, and to make it enter the viewer's left eye and the right eye, respectively. By inputting images observed from different angles to the eyes, the viewer can recognize the sense of space through the brain.

In this case, a method of dividing the image into the viewer's left eye and the right eye may be divided into a method of using a barrier and a method of using a lenticular lens, which is a kind of cylindrical lens. .

1 is a block diagram illustrating a barrier type stereoscopic display device according to the related art, and illustrates a method of using a barrier.

The barrier type stereoscopic display device according to the related art is a display module 1 in which a left eye image L and a right eye image R are displayed as a stereoscopic image display surface, as shown in FIG. The display module 1 is disposed to face the display module 1 and includes a slit barrier 2 alternately formed with an opening 2a and a blocking part 2b.

The barrier type blocks light using the blocking portion 2b of the slit barrier 2 to divide the left eye image L and the right eye image R into the viewer's left eye and right eye, respectively, so that stereoscopic images can be obtained. Implement

However, the conventional barrier type stereoscopic display device is configured such that the opening portion 2a and the blocking portion 2b are fixed to each other to be implemented around a stereoscopic image. Accordingly, there is a disadvantage that it is difficult to selectively implement the planar image and the stereoscopic image by mutual switching. That is, there is a problem that it is difficult to turn on / off the function of the barrier 2.

In order to solve this problem, a method of using a liquid crystal panel having a stripe-shaped pixel as a barrier 2 has been proposed. When the liquid crystal panel is applied to the barrier 2, some of the plurality of pixels are controlled to prevent light from being transmitted and others are controlled to block the light, thereby acting as a blocking part 2b and an opening 2a. Implement the image. In addition, when the light is transmitted to all pixels, a two-dimensional planar image is realized.

However, even if all pixels are controlled to transmit light, the liquid crystal molecules of the pixels are not fully controlled, so that the pixels having relatively low light transmittance exist. Accordingly, the liquid crystal panel has the same function as the blocking part 2b and the opening 2a as a whole, and thus there is a problem that three-dimensional stereoscopic images remain even when a two-dimensional planar image is implemented. The same phenomenon is shown in the method using a lenticular lens. As a result of the remaining three-dimensional stereoscopic image, the image quality of the two-dimensional planar image is deteriorated, and there is a problem of causing fatigue to the viewer.

Accordingly, an object of the present invention is to minimize the effects of the remaining three-dimensional stereoscopic image when the three-dimensional stereoscopic image is converted from the three-dimensional stereoscopic image, to implement a three-dimensional image display device with improved image quality improved It is to provide a driving method.

According to the present invention, there is provided a display panel in which unit pixels consisting of a plurality of subpixels are repeatedly arranged; An image signal generator for supplying a planar image signal or a stereoscopic image signal to each of the plurality of subpixels; A calculation unit for calculating luminance values corresponding to the plurality of subpixels in correspondence to the planar image signal or the stereoscopic image signal; And a luminance voltage generator for supplying signal voltages to the plurality of subpixels according to the luminance value calculated by the calculator. When the stereoscopic image signal is converted into a planar image signal, the calculator forms a unit pixel when the planar image signal is implemented. According to a driving method of a stereoscopic image display apparatus, the luminance value of any one subpixel is determined based on a first criterion based on luminance values corresponding to a plurality of subpixels.

Here, the unit pixels include first to ninth subpixels arranged in a matrix form of 3x3, one subpixel being a fifth subpixel, and the other subpixels surrounding the fifth subpixel. When the planar image signal is implemented, the luminance value corresponding to each of the fourth and sixth to ninth subpixels and the first to ninth subpixels may be the first to ninth luminance.

In addition, the reference equation is 5th luminance x 50% + ((1st luminance + 2nd luminance + 3rd luminance + 4th luminance + 6th luminance + 7th luminance + 8th luminance + 9th luminance) / 8) × 50 May be%.

In addition, the reference formula is fifth luminance x 50% + ((first luminance x a) + (second luminance x b) + (third luminance x c) + (fourth luminance x d) + (sixth luminance x e). ) + (7th luminance × f) + (eighth luminance × g) + (ninth luminance × h)) × 50%, where a is 1/6, b is 0, c is 1/6, d May be 1/6, e may be 1/6, f may be 1/6, g may be 0, and h may be 1/6.

In addition, the reference equation is fifth luminance x 50% + ((first luminance x a) + (second luminance x b) + (third luminance x c) + (fourth luminance x d) + (sixth luminance x e). ) + (7th luminance × f) + (eighth luminance × g) + (ninth luminance × h)) × 50%, where a is 1/16, b is 1/8, c is 1/16 , d may be 1/4, e may be 1/4, f may be 1/16, g may be 1/8, and h may be 1/16.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail. Hereinafter, a stereoscopic image display device of a multi view type having nine viewing areas will be described as an example. However, the present invention is not limited thereto, and the technical idea of the present invention can be applied to other forms and multi-view systems having more or less viewing areas.

In the stereoscopic image display apparatus according to the present invention, as shown in Figs. 2 and 3, the display panel 100 for displaying an image, and the planar image disposed on the display panel 100 on the display panel 100 A slit barrier 10 for blocking or passing a selective signal to form a stereoscopic image, and an image signal generator 200 for supplying a planar image signal or a stereoscopic image signal to each of the plurality of subpixels formed in the display panel 100; Supplying signal voltages to the plurality of subpixels according to the luminance value calculated by the operation unit 400 and the operation unit 400 in response to the planar image signal or the stereoscopic image signal. The luminance voltage supply unit 300 is included.

The slit barrier 10 according to the present invention consists of a slit 11 for passing light and a barrier 12 for blocking light. The slits 11 and the barrier 12 are alternately formed. The stereoscopic images 1, 2, 3, 4, 5, 6, 7, 8, and 9 formed on the display panel 100 are passed through or blocked by the slit 11 and the barrier 12, and thus, ①, ②, ③, It is distributed to the viewing zones of ④, ⑤, ⑥, ⑦, ⑧, ⑨. Thereby, the viewer accepts any one of the nine viewing areas (①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨) as the left eye image, and any one adjacent to the viewing area input as the left eye image The image is taken as an image, and a stereoscopic image is realized by binocular dimensionality. That is, the viewer can watch three-dimensional images at various positions while changing viewing positions as nine viewing regions (①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨) are secured. The slit barrier 10 may be a liquid crystal panel having pixels of a stripe shape. When the liquid crystal panel is applied as the slit barrier 10, when each pixel is OFF, light is transmitted to function as the slit 11, and when each pixel is ON, light is blocked to block the barrier ( It performs the same function as 12).

By using the barrier liquid crystal panel, some of the plurality of pixels are controlled to prevent light from being transmitted, and others are controlled to block the light to realize a stereoscopic image. In addition, when the light is transmitted to all pixels, a two-dimensional planar image is realized.

The display panel 100 according to the present invention is a display device for implementing a planar image. In the exemplary embodiment of the present invention, a liquid crystal panel is described as an example of a display device for implementing a planar image. However, the present invention is not limited thereto, and the organic light emitting diode (OLED) and the plasma display panel (PDP) are not limited thereto. ), FED (Field Emission Display) and VFD (Vacuum Fluorescent Display) can also be applied.

Although not specifically illustrated, the display panel 100 according to the present invention includes a thin film transistor substrate on which a thin film transistor (TFT) is formed, a color filter substrate opposite to the thin film transistor substrate and provided with a color filter layer, and both substrates. It includes a liquid crystal layer located in. Such a liquid crystal panel is a device for displaying a desired image by adjusting the light transmittance of liquid crystal cells arranged in a matrix form according to image signal information. The liquid crystal panel is formed by using light emitted from a light source. To form an image.

In the display panel 100, a plurality of subpixels are repeatedly arranged in up, down, left, and right directions. Each subpixel is provided with a thin film transistor (TFT), and each subpixel is driven independently. The display panel 100 according to the present invention may be implemented in a planar image mode and a three dimensional image mode.

The image signal generator 200 supplies image data to each subpixel according to the image signal input from the outside. The image data may be R, G, B plane image signals or first to ninth stereoscopic image signals (1, 2, 3, 4, 5, 6, 7, 8, 9).

When the 3D image display device is set to the 2D image mode, the controller sets 3 subpixels to form one pixel. Then, the planar video signals of R, G, and B are supplied to the pixels. Accordingly, a two-dimensional planar image is implemented as in the image realization method of a conventional liquid crystal display device.

On the other hand, when the 3D image display device is set to a 3D image mode, the control unit sets n subpixels to a 3D image pixel and supplies a 3D image signal corresponding to each subpixel. For example, when nine subpixels are set to one stereoscopic image pixel in order to secure nine viewing zones, the first to ninth stereoscopic image signals 1 generated by the image signal generator 200 may be used. , 2, 3, 4, 5, 6, 7, 8, 9) are input to the stereoscopic pixel. Then, a stereoscopic image is implemented according to a conventional three-dimensional stereoscopic image implementation method.

Each subpixel needs an appropriate luminance value to implement various stereoscopic and planar images. For example, a bright image should have a high luminance value, and a dark image should have a low luminance value. Accordingly, the calculation unit 400 calculates an appropriate luminance value to implement a stereoscopic image or a planar image according to an image signal input from the outside. The luminance voltage generator 300 supplies the luminance voltage to each subpixel in synchronization with the stereoscopic image signal or the planar image signal to be applied to the plurality of subpixels according to the luminance value calculated by the calculator 400.

Accordingly, a stereoscopic image or a planar image corresponding to an externally input image signal is implemented.

However, the stereoscopic image display device driven as described above has a problem that stereoscopic images remain when the stereoscopic image is converted from the stereoscopic image to the planar image as described above. That is, when the liquid crystal panel is used as a barrier as in the embodiment of the present invention, the liquid crystal cannot completely block and transmit light, and in the case of the lenticular lens method, the lens effect cannot be completely removed.

This phenomenon is described with reference to FIG. 5 as follows.

As in the above-described embodiment, each sub-pixel is divided into a plurality of viewing areas (①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨) to realize a three-dimensional stereoscopic image. , (2), (3), (4), (5), (6), (7), (8), (9) have independent luminance distributions as shown in FIG.

However, in the case of changing from a stereoscopic video signal to a flat video signal, ideally, the luminance distributions of the viewing areas ①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧ and ⑨ should all be the same. However, as described above, the stereoscopic image remains so that independent luminance distributions still exist in the plurality of viewing areas (①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨) as shown in FIG. do. As a result of the remaining three-dimensional stereoscopic image, the image quality of the two-dimensional planar image is deteriorated, and there is a problem of causing fatigue to the viewer.

In order to improve this, in the present invention, image processing is performed to make uniform the luminance distribution of each viewing area (1, 2, 3, 4, 5, 6, 7, 8 and 9). The principle of image processing according to the present invention is to calculate the luminance values appearing in each viewing area (①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨ according to a certain criterion, and calculate the calculated values for each sub. By supplying the pixels, the luminance deviation of each viewing area (1, 2, 3, 4, 5, 6, 7, 8 and 9) is minimized. That is, when the stereoscopic image signal is converted to the planar image signal, the calculation unit 400 calculates the luminance based on a luminance value corresponding to a plurality of subpixels corresponding to the calculation category when the planar image signal is implemented. The luminance value of any one of the plurality of subpixels is calculated.

5A and 5B, the horizontal distance along the horizontal axis is the width of the display panel 100.

Hereinafter, with reference to FIG. 2, it demonstrates concretely.

Prior to the description, a plurality of subpixels corresponding to the calculation category are defined as unit pixels P, and the unit pixels P include nine subpixels arranged in a matrix form of 3x3. Nine subpixels include first to ninth subpixels (a, b, c, d, x, e, f, g, h), as shown in FIG.

Here, the sub-pixel to be calculated by the operation unit 400 is the fifth sub-pixel (x), and the sub-pixel considered in calculating the luminance of the fifth sub-pixel (x) surrounds the fifth sub-pixel (x). First to fourth and sixth to ninth subpixels a, b, c, d, e, f, g, and h. When the planar image signal is implemented, luminance values corresponding to each of the first to ninth subpixels a, b, c, d, x, e, f, g, and h are first to ninth luminance.

In this case, the reference equation for calculating the luminance value of the fifth subpixel (x) is 5th luminance x 50% + ((1st luminance + 2nd luminance + 3rd luminance + 4th luminance + 6th luminance + 7th luminance) + 8th luminance + ninth luminance) / 8) × 50%.

This reference expression reflects 50% of the luminance value of the subpixel which is the calculation standard of the luminance value, and reflects 50% of the average value of the luminance values of the other subpixels of the unit pixels P. That is, the weights of the other subpixels are set equal. Accordingly, when the luminance value of each subpixel is updated while the unit pixel P of the calculation category is moved up, down, left, and right on the display panel 100, the variation of the luminance value between each subpixel is minimized. In particular, in the present invention, since the deviation of the luminance value is reduced by setting the adjacent subpixels as the calculation category, the implemented planar image is not distorted.

Meanwhile, weights of different subpixels may be changed according to the planar image to be implemented. For example, fifth luminance x 50% + ((first luminance x a) + (second luminance x b) + (third luminance x c) + (fourth luminance x d) + (sixth luminance x e) ) + (7th luminance × f) + (eighth luminance × g) + (ninth luminance × h)) × 50%, where a is 1/6, b is 0, c is 1/6, d May be 1/6, e may be 1/6, f may be 1/6, g may be 0, and h may be 1/6.

In another embodiment, the reference equation is fifth luminance x 50% + ((first luminance x a) + (second luminance x b) + (third luminance x c) + (fourth luminance x d) + (th 6 luminance × e) + (seventh luminance × f) + (eighth luminance × g) + (ninth luminance × h)) × 50%, a is 1/16, b is 1/8, c May be 1/16, d may be 1/4, e may be 1/4, f may be 1/16, g may be 1/8, and h may be 1/16.

Accordingly, as shown in Fig. 5C, the luminance values appearing in the viewing areas ①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧ and ⑨ are calculated according to the above-mentioned criteria, and the calculated luminance is calculated. By supplying a value to each subpixel, it can be seen that the luminance deviation of each viewing area ①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨ is minimized.

Meanwhile, in the above-described embodiment, the calculation category may be variously changed and set. That is, in the above-described example, the calculation is performed based on unit pixels in a substantially rectangular range, but the unit pixels may be set in various ranges such as diagonal, vertical, left and right directions, and triangles. However, in order for the screen to be driven normally, unit pixels that are too far away should not be defined as adjacent pixels. In general, it is preferable to set unit pixels to which the same or similar image data is applied as a calculation category.

As described above, according to the present invention, a stereoscopic image capable of realizing a two-dimensional planar image having improved image quality by minimizing the effect of the remaining three-dimensional stereoscopic image when the three-dimensional stereoscopic image is converted into a two-dimensional planar image. A method of driving a display device is provided.

Claims (5)

A display panel in which unit pixels consisting of a plurality of subpixels are repeatedly arranged; An image signal generator for supplying a planar image signal or a stereoscopic image signal to each of the plurality of subpixels; A calculator configured to calculate luminance values corresponding to the plurality of subpixels in response to the planar image signal or the stereoscopic image signal; A luminance voltage generator configured to supply a signal voltage to the plurality of subpixels according to the luminance value calculated by the calculator; When the stereoscopic image signal is converted into the planar image signal, the calculating unit calculates a value according to a reference equation based on luminance values corresponding to a plurality of subpixels of the unit pixel when the planar image signal is implemented. And a luminance value of one subpixel is determined. The method of claim 1, The unit pixel includes first to ninth subpixels arranged in a matrix form of 3х3, The one subpixel is a fifth subpixel, The other subpixels are first to fourth and sixth to ninth subpixels surrounding the fifth subpixel, And a luminance value corresponding to each of the first to ninth subpixels when the planar image signal is implemented. The method of claim 2, The reference formula is fifth luminance x 50% + ((first luminance + second luminance + third luminance + fourth luminance + sixth luminance + seventh luminance + eighth luminance + ninth luminance) / 8) × 50% A driving method of a stereoscopic image display apparatus, characterized in that. The method of claim 2, The reference formula is fifth luminance x 50% + ((first luminance x a) + (second luminance x b) + (third luminance x c) + (fourth luminance x d) + (sixth luminance x e)). + (7th luminance × f) + (eighth luminance × g) + (ninth luminance × h)) × 50%, Wherein a is 1/6, b is 0, c is 1/6, d is 1/6, e is 1/6, f is 1/6, g is 0, and h is 1/6. Method of driving image display device. The method of claim 2, The reference formula is fifth luminance x 50% + ((first luminance x a) + (second luminance x b) + (third luminance x c) + (fourth luminance x d) + (sixth luminance x e)). + (7th luminance × f) + (eighth luminance × g) + (ninth luminance × h)) × 50%, A is 1/16, b is 1/8, c is 1/16, d is 1/4, e is 1/4, f is 1/16, g is 1/8, h is 1/16 A driving method of a stereoscopic image display device.

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