CN103108205A - stereoscopic display system - Google Patents

Abstract

The invention provides a stereoscopic display system which comprises a display panel and a plurality of gamma lookup tables. The display panel has a plurality of pixel rows, and each pixel row has a plurality of pixels. The pixels in each pixel row comprise a first group of pixels and a second group of pixels, and each pixel comprises a first sub-pixel and a second sub-pixel. The gamma lookup table includes a first gamma lookup table and a second gamma lookup table. Particularly, the invention selects the gray scale signal generated by one of the first gamma lookup table and the second gamma lookup table according to a control signal and transmits the gray scale signal to the corresponding pixel.

Description

stereoscopic display system

technical field

The present invention relates to a display system, and more particularly to the operation of a stereoscopic display system with uniform brightness display.

Background technique

The stereoscopic display technology has become one of the important development directions of the current display technology because it can provide the viewer with vivid stereoscopic images. The prior art includes spatial stereoscopic display technology, the principle of which enables the display panel to simultaneously display two sets of pictures for the left eye and right eye respectively, and makes the left eye of the viewer only receive the left eye picture, and the right eye only receives the right eye picture. eye picture.

The screen switching frequency of a general flat panel display system is 60Hz. However, in order for the stereoscopic display system to display images viewed by the left eye and the right eye respectively, the image switching frequency must be increased to 120 Hz. In the existing technology, when the stereoscopic display system works in the mode of the screen switching frequency of 120Hz, and the characteristics of the transition speed of the liquid crystal itself, the turn-on time and the turn-off time are not fast enough, causing crosstalk in the stereoscopic display system. The phenomenon. In order to solve this crosstalk phenomenon, in the prior art, a black picture can be inserted between the left-eye picture and the right-eye picture to improve the crosstalk phenomenon that the liquid crystal transition and shutdown time is not fast enough. In order to achieve this purpose, reduce the resolution and increase the screen switching frequency to 240Hz.

However, in the existing solutions, the level of the grayscale signal provided to each pixel on the panel of the stereoscopic display system may be different. At this time, the picture displayed by the stereoscopic display system will have uneven brightness.

Contents of the invention

In view of this, the present invention provides a stereoscopic display system capable of outputting stereoscopic images with uniform brightness.

The invention provides a stereoscopic display system, which includes a display panel, multiple scanning lines, multiple data lines, and multiple gamma lookup tables. The display panel has a plurality of pixel rows arranged along a row direction, and each pixel row is sequentially arranged with a plurality of pixels along a column direction. Wherein, the pixels in each pixel row include a first group of pixels and a second group of pixels, and each pixel includes a first sub-pixel and a second sub-pixel. Each pixel row is electrically connected to one of the scanning lines respectively. The scanning lines include a plurality of first scanning lines and a plurality of second scanning lines arranged alternately, and the scanning signals received by each first scanning line and the adjacent second scanning lines have the same enabling time. The data lines also include a plurality of first data lines and a plurality of second data lines, and each of the first data lines and the second data lines are respectively electrically connected to corresponding pixels. In addition, the gamma lookup table includes a first gamma lookup table and a second gamma lookup table. Wherein, the first sub-pixels of each first group of pixels are electrically connected to the first data line, and the second sub-pixels of the first group of pixels are electrically connected to the second data line. In addition, the first sub-pixels of each second group of pixels are electrically connected to the second data line, and the second sub-pixels of the second group of pixels are electrically connected to the first data line. The first group of pixels and the second group of pixels are alternately arranged in the column direction, and alternately arranged in the row direction. In the present invention, according to a control signal, the grayscale signal generated by one of the first gamma lookup table and the second gamma lookup table is selected and sent to the corresponding pixel.

Since the grayscale signals provided to the pixels come from the same gamma look-up table during the same display period, the brightness of the left-eye frame and the right-eye frame are the same during a display cycle. In addition, during the next display period, another gamma look-up table will provide grayscale signals to the pixels at the same position, so the brightness of each pixel row will be averaged. In this way, the stereoscopic display system of the present invention can output stereoscopic images with uniform brightness.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following preferred embodiments are described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a pixel matrix of a stereoscopic display system according to an embodiment of the present invention;

FIG. 2 shows a timing diagram of scanning signals according to an embodiment of the present invention;

FIG. 3A is a schematic diagram showing the relationship between the control signal XSFT and the display period according to an embodiment of the present invention;

FIG. 3B is a schematic diagram of a grayscale signal received by a sub-pixel corresponding to a gamma look-up table output according to an embodiment of the present invention.

reference sign

100: Stereoscopic display system 102: Display panel

104, 106: Gamma lookup table 110: Data drive circuit

115: Scanning drive circuit 120: The first group of pixels

130: The second group of pixels 120a: The first sub-pixel of the first group of pixels

120b: the second sub-pixel of the first set of pixels 130a: the first sub-pixel of the second set of pixels

130b: the second sub-pixel of the second group of pixels 140: timing controller

A: The grayscale signal output by the first gamma lookup table

B: The grayscale signal output by the second gamma lookup table

D1, D2: data line

G, G1, G2, G3, G4, GK-1, GK: scan line

T: Enable time of scan signal X: Row direction

XSFT: Control signal Y: Column direction

Detailed ways

FIG. 1 is a schematic diagram of a stereoscopic display system according to an embodiment of the present invention. Please refer to FIG. 1, the stereoscopic display system 100 provided by this embodiment includes a display panel 102, a first gamma lookup table 104 and a second gamma lookup table 106, a plurality of scanning lines G1, G2, ..., GK, and a plurality of data lines. A plurality of scan lines G1 , G2 , . . . , GK are sequentially arranged along the column direction Y in the display panel 102 , and K is a positive integer. Wherein, each scanning line G1, G2, ..., GK corresponds to one of the plurality of pixel rows R1, R2, ..., RK, and the scanning lines include a plurality of first scanning lines and a plurality of second scanning lines arranged alternately , the first scan line can be, for example, an even-numbered scan line, and the second scan line is an odd-numbered scan line, and the scan signal received by the N-th scan line has the same consistency as the scan signal received by the N+1-th scan line. Can time. In addition, along the row direction X, a plurality of data lines including the first data line D1 and the second data line D2 are arranged in sequence, and are respectively coupled to the data driving circuit 110 . In each pixel row R1 , R2 , . In addition, each first group of pixels 120 has a first sub-pixel 120a and a second sub-pixel 120b, the first sub-pixel of the first group of pixels is coupled to the corresponding first data line, and the second sub-pixel of the first group of pixels The pixels are coupled to the corresponding second data lines. Each second group of pixels 130 has a first sub-pixel 130a and a second sub-pixel 130b, the first sub-pixel of the second group of pixels is coupled to the corresponding second data line, and the second sub-pixel of the second group of pixels is coupled to Connect to the corresponding first data line. In this embodiment, the first group of pixels 120 and the second group of pixels 130 are alternately arranged in the row direction X, and also alternately arranged in the column direction Y. In addition, the first sub-pixel 120a, 130a and the second sub-pixel 120b, 130b of each pixel in each pixel row R1, R2, . . . , RK are respectively coupled to the corresponding scan line G1, G2, . When the Nth row of scan lines and the N+1th row of scan lines receive the scan signal at the same time as the enabling time, the pixels of the Nth row and the N+1th row of pixels are turned on at the same time and receive signals from the first gamma lookup table 104 and the gray level signal of one of the second gamma lookup table 106 .

The stereoscopic display system 100 further includes a data driving circuit 110 for transmitting a data signal, and the data signal is compensated by one of the first gamma lookup table 104 and the second gamma lookup table 106 to output a gray scale signal. In addition, the stereoscopic display system 100 further includes a timing controller 140 for providing the control signal XSFT to the data driving circuit 110 . After receiving the control signal XSFT, the data driving circuit transmits the grayscale signals of the first gamma lookup table 104 and the second gamma lookup table 106 to corresponding pixels through the data lines respectively. At the beginning of a display period, according to the initial state of the control signal XSFT, the grayscale signal can be selected to be sent to the corresponding sub-pixel through the data line. The stereoscopic display system 100 further includes a scan driving circuit 115 for providing scan signals to corresponding scan lines.

Please refer to Figure 2. Figure 2 shows the enabling time of the scanning lines. As shown in Figure 2, multiple scanning lines G1, G2, ..., GK, the scanning signal received by the scanning line of the Nth row and the scanning signal of the N+1th row The scanning signals received by the lines have the same enable time T, where N is a positive integer not greater than K, and the enable time from the enable time of the first scan line G1 to the enable time of the K-th scan line GK is defined as A frame time (frame). In a stereoscopic display system, a frame time can be used to display a left-eye frame or a right-eye frame.

FIG. 3A shows a schematic diagram of the relationship between the control signal XSFT and the display period according to an embodiment of the present invention. At the beginning of each picture in the first display period, the initial state of the control signal XSFT is the first level, which can be, for example, low Potential L; at the beginning of each frame in the second display period, the initial state of the control signal XSFT is the second level, which can be, for example, a high potential H.

FIG. 3B is a schematic diagram of a grayscale signal received by a sub-pixel corresponding to a gamma look-up table output according to an embodiment of the present invention. Please refer to FIG. 3A together. When the first frame 1stframe of a display cycle starts, the first row of scan lines G1 and the second row of scan lines G2 are enabled, and the state of the control signal XSFT is at the first level. For example, if the potential is low L, the first sub-pixel 120a of the first group of pixels can receive the grayscale signal from the first gamma look-up table 104, denoted by A, and the second sub-pixel 120b of the first group of pixels can receive the grayscale signal from the first gamma look-up table 104. The gray-scale signal of the second gamma look-up table 106 is represented by B, and the first sub-pixel 130a of the second group of pixels receives the gray-scale signal from the second gamma look-up table 106, represented by B, and the first sub-pixel 130a of the second group of pixels The second sub-pixel 130b receives the grayscale signal from the first gamma look-up table 104, denoted by A, and so on; when the first row of scanning lines G1 and the second row of scanning lines G2 are disabled, and the third row of scanning lines When G3 and the fourth scan line G4 are enabled, the state of the control signal XSFT is at the second level, for example, a high potential H, and the first sub-pixel 120a of the first group of pixels can receive the signal from the second gamma search The gray-scale signal of the table 106 is represented by B, and the second sub-pixel 120b of the first group of pixels receives the gray-scale signal from the first gamma look-up table 104, represented by A, and the first sub-pixel of the second group of pixels 130a receives the grayscale signal from the first gamma lookup table 104, represented by A, the second sub-pixel 130b of the second group of pixels receives the grayscale signal from the second gamma lookup table 106, represented by B, and so on . Please refer to Figure 1 with Figure 3B, so the grayscale signal received by the first subpixel of the first row of pixels R1 is ABBAABBA... from left to right, and the grayscale signal received by the second subpixel of the first row of pixels R1 The signals are BAABBAAB... from left to right.

When the second frame 2nd frame of a display period starts, the first row scan line G1 and the second row scan line G2 are enabled, and the state of the control signal XSFT is at the first level, which can be, for example, a low potential L. When the third scan line G3 and the fourth scan line G4 are enabled, the state of the control signal XSFT is at the second level, and so on. The rest of the 3rd frame of the third picture and the 4th frame of the fourth picture are all described in the same way, and will not be repeated here. The 2nd frame of the second frame and the 4th frame of the fourth frame can be, for example, a black frame B (Black). Inserting a black frame B (Black) between the left-eye frame L and the right-eye frame R can improve the ability of the liquid crystal to turn off time, Reduce crosstalk. The first frame 1st frame can be, for example, a left-eye frame L, and the third frame 3rd frame can be, for example, a right-eye frame R. The stereoscopic display system 100 completes the display of the left-eye L and right-eye R images in one display cycle.

When the 1st frame of the first frame of the next display period starts, the scanning line G1 of the first row and the scanning line G2 of the second row are enabled, and the state of the control signal XSFT is at the second level, which can be, for example, a high potential H , the first sub-pixel 120a of the first group of pixels can receive the grayscale signal from the second gamma look-up table 106, denoted by B, and the second sub-pixel 120b of the first group of pixels receives the gray-scale signal from the first gamma look-up table The grayscale signal of 104 is represented by A, and the first subpixel 130a of the second group of pixels receives the grayscale signal from the first gamma lookup table 104, represented by A, and the second subpixel 130b of the second group of pixels receives The gray-scale signal from the second gamma look-up table 106 is represented by B, and so on; when the scanning line G1 of the first row and the scanning line G2 of the second row are disabled, and the scanning line G3 of the third row and the scanning line of the fourth row When the scan line G4 is enabled, the state of the control signal XSFT is at the first level, for example, a low potential L, and the first sub-pixel 120a of the first group of pixels can receive the gray scale from the first gamma look-up table 104 signal, represented by A, and the second sub-pixel 120b of the first group of pixels receives the gray scale signal from the second gamma look-up table 106, represented by B, and the first sub-pixel 130a of the second group of pixels receives the gray scale signal from the second The grayscale signal of the gamma lookup table 106 is denoted by B, the second sub-pixel 130b of the second group of pixels receives the grayscale signal from the first gamma lookup table 104, denoted by A, and so on. Please refer to Figure 1 again with Figure 3B, so the grayscale signal received by the first subpixel of the first row of pixels R1 is BAABBAAB... from left to right, and the grayscale signal received by the second subpixel of the first row of pixels R1 The signals are ABBAABBA... from left to right.

An embodiment of the present invention is provided in different display periods, by switching the control signal XSFT to have different initial levels in each different display period, so that the first group of pixels 120 and the second group of pixels 130 in every two display periods The gamma look-up table for conduction is different to improve the brightness uniformity of the display screen. Even though the gamma look-up table is used to correct the error of the grayscale signal, there is still a little error value between different gamma look-up table circuits, and the error between the low-level circuits can be further reduced by alternately switching between two display cycles. The brightness uniformity of the display screen can be improved.

It can be known from the above that when the brightness of the sub-pixels is different, that is, the brightness A and B of the gray-scale signal output by the first gamma look-up table 104 and the second gamma look-up table 106 are not equal, bright and dark lines will be generated under the display screen, and then In the same display cycle, in order to avoid uneven brightness of the left and right eyes, the XSFT signal waveforms of the 4 frames (frame) in one display cycle are the same, and the XSFT signal waveform in the next display cycle is complementary to the waveform of the previous cycle. The grayscale voltage is switched, so the luminance value of each pixel row can be compensated by complementarity, so as to solve the problem of bright and dark lines on the screen.

In some embodiments, the number of data lines is 2M, and the number of scan lines is N. Therefore, the picture resolution provided in these embodiments is M*N. However, because in this embodiment, the scanning lines of the Nth row and the N+1th row are enabled simultaneously, the actual resolution is M*N/2, where M and N are natural numbers.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any skilled person familiar with the related art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection of the invention should be defined by the appended claims.

Claims (10)

1. A stereoscopic display system, characterized in that, comprising: A display panel, comprising a plurality of pixel rows arranged along a row direction, and each pixel row is sequentially arranged with a plurality of pixels along a column direction, wherein the pixels have a first group of pixels and a second group of pixels, and each A pixel includes a first sub-pixel and a second sub-pixel; A plurality of scanning lines, electrically connected to corresponding pixel rows, including a plurality of first scanning lines and a plurality of second scanning lines arranged alternately, wherein each first scanning line and the adjacent second scanning line receive scanning The signals have the same enable time; A plurality of data lines, including a plurality of first data lines and a plurality of second data lines, each first data line and each second data line are electrically connected to a corresponding pixel; and Multiple gamma lookup tables, including a first gamma lookup table and a second gamma lookup table, Wherein the first sub-pixel of each first group of pixels is electrically connected to the first data line, and the second sub-pixel of the first group of pixels is electrically connected to the second data line, and the first sub-pixel of each second group of pixels Electrically connected to the second data line, and the second sub-pixels of the second group of pixels are electrically connected to the first data line, the pixels of the first group and the pixels of the second group are arranged alternately in the column direction, and in the row The directions are arranged alternately, and the gamma look-up tables select one of the first gamma look-up table and the second gamma look-up table according to a control signal to send the grayscale signal to the corresponding pixel. 2. The stereoscopic display system according to claim 1, further comprising: When the control signal is at a first level, the first gamma look-up table provides a gray scale signal to the first sub-pixel of the first group of pixels and the second sub-pixel of the second group of pixels, and the second The gamma lookup table provides gray scale signals to the second subpixels of the first group of pixels and the first subpixels of the second group, when the control signal is at a second level, it is provided by the first gamma lookup table The grayscale signal is provided to the second subpixel of the first group of pixels and the first subpixel of the second group, and the grayscale signal is provided by the second gamma lookup table to the first subpixel of the first group of pixels and the first subpixel of the first group of pixels. The second sub-pixel of the second group of pixels. 3. The stereoscopic display system according to claim 2, further comprising: In a display period (4 frames), the initial state of the control signal is the first level, and in the next display period, the initial state of the control signal is the second level. 4. The stereoscopic display system according to claim 3, wherein the first level is a low potential and the second level is a high potential. 5. The stereoscopic display system according to claim 3, further comprising: The control signal changes the level state according to the enable time of the scan signal. 6. The stereoscopic display system according to claim 3, wherein each display period includes a first frame time and a second frame time, and the first frame time and the second frame time are equal. 7. The stereoscopic display system according to claim 5, further comprising a black frame between the first frame time and the second frame time. 8. The stereoscopic display system according to claim 1, further comprising a timing controller for providing the control signal. 9. The stereoscopic display system according to claim 1, further comprising a scanning driving unit for providing scanning signals to corresponding scanning lines. 10. The stereoscopic display system according to claim 1, further comprising a data driving unit for providing data signals to corresponding data lines and electrically connected to the first gamma look-up table and the second gamma lookup table.

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