TWI505255B - Pixel structure - Google Patents

Description

Pixel structure

The present invention relates to a pixel structure.

With the evolution of display technology, flat panel displays (FPDs) with high image quality, good space utilization, and no radiation have become the mainstream of displays. In the popularity of flat-panel displays, in addition to the demands of light, thin, short, and small, consumers expect that the color of the image displayed on the flat panel display is close to the real color of the real thing, that is, the so-called high color reproducibility ( Color reproduction). In order to meet the needs of consumers, the industry has invested in the research and development of high-color reproduction technology.

Existing high color reproduction techniques typically achieve high color reproducibility by replacing the backlight of a flat panel display with a color filter. For example, by using a color filter with a high color saturation (saturation), the color gamut of a flat panel display can be improved, thereby enabling the flat panel display to display a real color close to the real thing. However, the high-saturation color filter film has a relatively low light transmittance, and therefore, if a certain brightness of the display image is to be maintained at a high saturation, it is bound to cause a back The power consumption of the light source is increased. With the rise of environmental awareness and the demand for energy saving and carbon reduction, the power consumption of flat panel displays is bound to be further reduced. Therefore, how to balance the saturation and the light transmittance is one of the topics that developers are eager to solve.

The present invention provides a pixel structure capable of providing good saturation and light transmittance.

A pixel structure of the present invention includes a first sub-pixel structure displaying a first color, a second sub-pixel structure displaying a second color, and a third sub-pixel displaying a third color having a first saturation And a fourth sub-pixel structure displaying a third color having a second saturation, wherein the first saturation is different from the second saturation. The first sub-pixel structure, the second sub-pixel structure, the third sub-pixel structure, and the fourth sub-pixel structure are juxtaposed to each other. In the first display mode, only one of the third sub-pixel structure and the fourth sub-pixel structure is turned on, and in the second display mode, both the third sub-pixel structure and the fourth sub-pixel structure are Is turned on, wherein the gray scale of the first color predetermined display is L1, the gray scale of the second color predetermined display is L2, the gray scale of the third color predetermined display is L3, and the average value of L1, L2, L3 is Ave (L1, L2, L3), the absolute value of the difference between L1, L2, and L3 and the average value Ave (L1, L2, L3) is |L i -Ave(L1, L2, L3)| _{i = 1 ~ 3} , and draws When the total gray level of the prime structure is L0, L1, L2, and L3 conform to the following relation (1) and are displayed in the second display mode:

In an embodiment of the invention, the area of the third sub-pixel structure is The sum of the areas of the fourth sub-pixel structure is equal to the area of the first sub-pixel structure or the area of the second sub-pixel structure.

In an embodiment of the invention, the third sub-pixel structure and the fourth sub-pixel structure are independently driven.

In an embodiment of the invention, the first color, the second color, and the third color are red, blue, and green, respectively.

In an embodiment of the invention, the first saturation is greater than the second saturation.

In an embodiment of the invention, the transmittance of the third sub-pixel structure is lower than the transmittance of the fourth sub-pixel structure under the same display gray scale.

In an embodiment of the invention, the area of the third sub-pixel structure is 40% to 60% of the area of the fourth sub-pixel structure.

In an embodiment of the invention, when the L1, L2, and L3 do not conform to the relation (1), the pixel structure is displayed in one of the first display mode and the second display mode.

In an embodiment of the invention, the first display mode is to turn on the third sub-pixel structure and turn off the fourth sub-pixel structure.

In an embodiment of the invention, the first sub-pixel structure, the second sub-pixel structure, the third sub-pixel structure and the fourth sub-pixel structure respectively have a first color filter pattern and a second color. a filter pattern, a third color filter pattern, and a fourth color filter pattern.

A display method of a pixel structure of the present invention includes the following steps. First, the initial display mode is performed in the above-described pixel structure, wherein the initial display mode is one of the first display mode and the second display mode. Next, the first color, the second color, and the gray scale of the third color predetermined display are read, wherein the gray scale of the first color predetermined display is L1, and the gray scale of the second color predetermined display is L2, third The color preset display has a gray scale of L3, and the total gray scale of the pixel structure is L0. Next, the average value Ave (L1, L2, L3) of L1, L2, and L3 is calculated. The absolute value of the difference between L1, L2, and L3 and the average value Ave (L1, L2, L3) is calculated: |L i -Ave(L1, L2, L3)| _{i = 1 ~ 3} . Then, it is determined whether L1, L2, and L3 satisfy the relationship (1): |L i -Ave(L1, L2, L3)| _{i = 1 ~ 3} 5% × L0. If L1, L2, and L3 match the relational expression (1), the display is performed in the second display mode. If L1, L2, and L3 do not conform to the relational expression (1), the display mode is continued in the initial display mode.

In an embodiment of the invention, the initial display mode is the first display mode, and if it is determined that L1, L2, and L3 do not conform to the relation (1), the display is continued in the first display mode.

In an embodiment of the invention, the initial display mode is the second display mode, and if it is determined that L1, L2, and L3 do not conform to the relation (1), the display is continued in the second display mode.

Based on the above, the pixel structure of the present invention includes a third sub-pixel structure and a fourth sub-pixel structure that display the same third color but different saturation. By simultaneously turning on the third sub-pixel structure and the fourth sub-pixel structure, the sub-pixel structure with relatively low saturation but relatively high light transmittance can compensate the overall light transmittance of the pixel structure or borrow Sub-pixel structure compensated by a sub-pixel structure with relatively high saturation but relatively low light transmittance The overall display color of the structure allows the pixel structure to provide the desired saturation and light transmittance.

The above described features and advantages of the invention will be apparent from the following description.

10‧‧‧ pixel structure

12‧‧‧ First subpixel structure

14‧‧‧Second subpixel structure

16‧‧‧ Third sub-pixel structure

18‧‧‧ fourth sub-pixel structure

D1‧‧ Direction

S50, S100, S200, S300, S400, S500A‧‧‧ steps

1 is a top plan view of a pixel structure in accordance with an embodiment of the present invention.

2 is a flow chart of a display mode for discriminating a pixel structure, in accordance with an embodiment of the present invention.

1 is a top plan view of a pixel structure in accordance with an embodiment of the present invention. Referring to FIG. 1, the pixel structure 10 of the present embodiment includes a first sub-pixel structure 12, a second sub-pixel structure 14, a third sub-pixel structure 16, and a fourth sub-pixel structure 18, wherein the first sub- The pixel structure 12, the second sub-pixel structure 14, the third sub-pixel structure 16, and the fourth sub-pixel structure 18 are juxtaposed to each other. In practical applications, the display to which the pixel structure 10 of the present embodiment is applied may include a plurality of pixel structures 10, and the pixel structures 10 are arranged, for example, in an array manner, so that the display to which the pixel structure 10 is applied is achieved. The display of the face, and the pixel structure 10 may further include an active component and a display component. The display can be, for example, a liquid crystal display, an electrowetting display Display, electrophoretic display or other display.

Specifically, the first sub-pixel structure 12 and the second sub-pixel structure 14 of the present embodiment have, for example, rectangular outlines each having a long side extending in the direction D1. Meanwhile, the third sub-pixel structure 16 and the fourth sub-pixel structure 18 are located between the first sub-pixel structure 12 and the second sub-pixel structure 14, and both are arranged in the direction D1, but the present invention is not limited thereto. . The arrangement of the first sub-pixel structure 12, the second sub-pixel structure 14, the third sub-pixel structure 16, and the fourth sub-pixel structure 18 may vary depending on design requirements.

The first sub-pixel structure 12 is adapted to display a first color, the second sub-pixel structure 14 is adapted to display a second color, the third sub-pixel structure 16 is adapted to display a third color, and the fourth sub-pixel structure 18 Also suitable for displaying a third color, wherein the third color displayed by the third sub-pixel structure 16 has a first saturation, and the third color displayed by the fourth sub-pixel structure 18 has a second saturation, and the first saturation The degree is different from the second saturation. In other words, the third sub-pixel structure 16 and the fourth sub-pixel structure 18 of the present embodiment display the same color (third color) but have different saturations.

Specifically, the first sub-pixel structure 12, the second sub-pixel structure 14, the third sub-pixel structure 16, and the fourth sub-pixel structure 18 of the embodiment respectively have, for example, a first color filter pattern (not drawn The second color filter pattern (not shown), the third color filter pattern (not shown), and the fourth color filter pattern (not shown). In other words, the pixel structure 10 of the present embodiment achieves full coloring by, for example, setting the color filter pattern. Therefore, the pixel structure 10 can be applied to a display suitable for realizing full color through a color filter pattern.

In this embodiment, the first saturation is, for example, greater than the second saturation. One Generally speaking, when the color filter pattern is used to achieve the full color effect, the concentration of the pigment or dye in the color filter pattern determines the color saturation and light transmittance displayed by the sub-pixel structure. When the third sub-pixel structure 16 and the fourth sub-pixel structure 18 have the same area, if the first saturation is greater than the second saturation, the third sub-pixel structure 16 has a lower transmittance than the fourth. The light transmittance of the sub-pixel structure 18.

Under such a design, when the third sub-pixel structure 16 is turned on and the fourth sub-pixel structure 18 is not turned on, the display color presented by the display screen can exhibit a higher saturation. When the fourth sub-pixel structure 18 is turned on and the third sub-pixel structure 16 is not turned on, the display screen can exhibit a higher light transmittance. In addition, when the third sub-pixel structure 16 and the fourth sub-pixel structure 18 are both turned on, the fourth sub-pixel structure 18 having a relatively high light transmittance can compensate for the third sub-pixel with relatively low light transmittance. The third sub-pixel structure 16 of the structure 16 having a light transmittance and a relatively high saturation can also compensate for the color saturation of the fourth sub-pixel structure 18 having a relatively low saturation. Therefore, the pixel structure 10 can provide various display effects by various display modes in the display effect of the third color. In this way, the pixel structure 10 can provide ideal saturation and light transmittance according to the requirements of the display screen.

In addition, the total area of the area of the third sub-pixel structure 16 and the fourth sub-pixel structure 18 of the present embodiment is equal to the area of the first sub-pixel structure 12 or the area of the second sub-pixel structure 14. That is, the present embodiment shows that the sub-pixel structures of different colors each account for about one-third of the total area of the pixel structure 10. In this embodiment, the area of the third sub-pixel structure 16 displaying the third color is, for example, the same as the area of the fourth sub-pixel structure 18, that is, the third sub-pixel structure 16 and the fourth sub-pixel. structure 18 each account for one-sixth of the total area of the pixel structure 10, but the invention is not limited thereto. Those of ordinary skill in the art can design the area of each sub-pixel according to their design requirements. In other embodiments, the area of the third sub-pixel structure 16 is 40% to 60% of the total area of the third sub-pixel structure 16 and the fourth sub-pixel structure 18.

In this embodiment, the third sub-pixel structure 16 and the fourth sub-pixel structure 18 can be independently driven. Therefore, the pixel structure 10 of the present embodiment can perform, for example, at least two display modes. In the first display mode, only one of the third sub-pixel structure 16 and the fourth sub-pixel structure 18 is turned on. In the second display mode, both the third sub-pixel structure 16 and the fourth sub-pixel structure 18 are turned on. At this time, the third sub-pixel structure 16 and the fourth sub-pixel structure 18 may be respectively provided with the same or different driving signals.

In an actual application, the display may be displayed in a first display mode or a second display mode depending on the displayed content. For example, when watching a movie, the color table and the degree are required to be high, and the sub-pixel structure with higher saturation can be set (one of the third sub-pixel structure 16 and the fourth sub-pixel structure 18). ) to display. When the Internet is connected, the color saturation is required to be low, and the sub-pixel structure (the other of the third sub-pixel structure 16 and the fourth sub-pixel structure 18) with lower saturation can be set for display.

In addition to selecting a display mode according to different display requirements, the display method of the pixel structure 10 can also switch the display mode during display to obtain a more efficient display method for the characteristics of the picture to be displayed. 2 is a flow chart of a display mode for discriminating and switching pixel structures in accordance with an embodiment of the present invention. Referring to FIG. 2, first, an initial display mode is performed, wherein the initial display mode is one of the first display mode and the second display mode (step S50). Next, reading the gray scale of each color predetermined display, wherein the gray scale of the first color predetermined display is L1, the gray scale of the second color predetermined display is L2, and the gray scale of the third color predetermined display is L3, and the pixel structure The total number of gray levels that can be displayed is L0 (step S100). Next, the average values Ave (L1, L2, L3) of L1, L2, and L3 are calculated (step S200). The absolute value of the difference between L1, L2, and L3 and the average value Ave (L1, L2, L3) is further calculated: |L i -Ave(L1, L2, L3)| _{i = 1 to 3} (step S300). Then, it is determined whether L1, L2, and L3 satisfy the relationship (1): |L i -Ave(L1, L2, L3)| _{i = 1 ~ 3} 5% × L0 (step S400). If L1, L2, and L3 are in the relationship (1), the display is performed in the second display mode (step S500A), that is, regardless of the initial display mode of the display (the first display mode or the second display mode), When L1, L2, and L3 satisfy the relational expression (1), they are switched to the second display mode for display. If L1, L2, and L3 do not conform to the relation (1), the display mode (i.e., one of the first display mode and the second display mode) is continuously displayed.

Further, if the display mode is initially set to the first display mode and the determination in step S400 is NO, the display is continued in the first display mode after step S400. On the other hand, if the display mode is initially set to the second display mode, and the determination in step S400 is NO, the display is continued in the second display mode after step S400. That is, when L1, L2, and L3 do not conform to the relation (1), the display maintains the initial display mode without switching between the first display mode and the second display mode.

It can be seen from the above relationship (1) that the present embodiment selectively switches to the second display mode. The condition of the formula is that when the color to be displayed is not a specific color, it is, for example, white, gray or black. Since such a color itself has a relatively low chroma, the present embodiment can enhance the light transmittance without affecting the color expression by causing the pixel structure 10 displaying the colors to be displayed in the second display mode. However, whether the display is originally performed in the first display mode or the second display mode, the pixel structure 10 can be switched to the second display mode for display as long as the gray scale of the predetermined color display conforms to the relation (1). A high-efficiency display method is obtained by increasing the light transmittance without affecting the color expression.

In fact, the first display mode can be further divided into two sub-display modes, the first sub-mode of the first display mode is to turn on the third sub-pixel structure and close the fourth sub-pixel structure, and the second display mode is second. The sub mode is to close the third subpixel structure and turn on the fourth subpixel structure. For convenience of description, the first sub mode of the first display mode is also referred to as a first A display mode, and the second sub mode of the first display mode is also referred to as a first B display mode.

The third color displayed in the third sub-pixel structure 16 has a first saturation, and the third color displayed in the fourth sub-pixel structure 18 has a second saturation, and when the first saturation is greater than the second saturation, The various display modes described above will exhibit different display effects. For example, in the first A display mode, since the third sub-pixel structure 16 of the third sub-pixel structure 16 and the fourth sub-pixel structure 18 having only a large saturation is turned on, color saturation can be obtained. A higher degree of picture. In the first B display mode, since only the fourth sub-pixel structure 18 having the smaller saturation in the third sub-pixel structure 16 and the fourth sub-pixel structure 18 is turned on, the color saturation is lower. A screen with a high light transmittance. In the second display mode, the third sub-pixel structure 16 and the fourth sub-pixel node The structure 18 is turned on to obtain a picture in which the color saturation and the light transmittance are not too low.

In the prior art, when the display information is different from the color gamut (color specification) of the display, the phenomenon that the display screen chromaticity is abnormally saturated or distorted easily occurs. In particular, the green color coordinates defined by different color specifications vary greatly, so the phenomenon of abnormally saturated or distorted chromaticity is particularly likely to occur in green images. In the present embodiment, the first color, the second color, and the third color are set to, for example, red, blue, and green, respectively. Since the third sub-pixel structure 16 and the fourth sub-pixel structure 18 of the embodiment can display green of different saturations, the embodiment can open the third sub-pixel structure 16 and the fourth sub-pixel structure 18 through the embodiment. At least one of them displays the required green color in response to different color specifications, thereby improving the abnormal saturation or distortion of the chromaticity. That is to say, the display to which the pixel structure 10 of the present embodiment is applied can be displayed in different display modes according to different color specifications to display an ideal picture.

In the following, the display effect of the pixel structure in different display modes when the area ratio of the third sub-pixel structure and the fourth sub-pixel structure is changed under the condition that the color of the sub-pixel structure is determined is shown in Table 1.

In Table 1, "area ratio" refers to the area ratio of the third sub-pixel structure 16 to the fourth sub-pixel structure 18. Here, the sum of the area of the third sub-pixel structure 16 and the area of the fourth sub-pixel structure 18 is, for example, equal to the area of the first sub-pixel structure 12 or the area of the second sub-pixel structure 14. Furthermore, the green and white color coordinates described above are the color coordinates of the color displayed by the pixel structure 10 in the CIE 1931 color space. Here, the green color coordinates are pixels when the first sub-pixel structure 12 and the second sub-pixel structure 14 are not turned on. The green color coordinates displayed by the structure. It can be seen from the green color coordinate data column that the first saturation of the green displayed by the third sub-pixel structure 16 is smaller than the second saturation of the green color displayed by the fourth sub-pixel structure 18. In addition, the white color coordinates are white color coordinates displayed by the pixel structure 10 when both the first sub-pixel structure 12 and the second sub-pixel structure 14 are turned on. Further, the above-mentioned "light transmittance" refers to the overall light transmittance of the pixel structure 10 when white is displayed in accordance with the above conditions. The above "saturation" is based on the saturation set by the National Television System Committee (NTSC).

As can be seen from Table 1, in the experimental example in which the area ratio of the third sub-pixel structure 16 to the fourth sub-pixel structure 18 is 40:60 to 60:40, when the display is performed in the second mode, the pixel structure 10 as a whole The light transmittance may be higher than the light transmittance of the pixel structure having an area ratio of 0:100 (i.e., the pixel structure 10 only sets a high saturation sub-pixel structure to display green light). Moreover, when displaying in the second mode, the overall saturation of the pixel structure 10 can be higher than that of the pixel having an area ratio of 100:0 (ie, the pixel structure is only set with a low saturation sub-pixel structure to display green light). The overall saturation of the structure. Therefore, the pixel structure 10 can be displayed according to the requirements of different saturation and light transmittance. However, the above-described means for defining the third color as green is for illustrative purposes only, and the embodiment is not intended to limit the third color. Those skilled in the art can select a third color according to their design requirements.

In summary, the pixel structure of the present invention includes a third sub-pixel structure and a fourth sub-pixel structure that display the same third color but different saturation. By turning on the third sub-pixel structure and the fourth sub-pixel structure, the saturation can be relatively low but the light is worn. The sub-pixel structure with relatively high transmittance compensates for the overall light transmittance of the pixel structure, so that the pixel structure can have both good saturation and light transmittance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

S50, S100, S200, S300, S400, S500A‧‧‧ steps

Claims (13)

A pixel structure includes: a first sub-pixel structure displaying a first color; a second sub-pixel structure displaying a second color; and a third sub-pixel structure displaying a third color, and The third color displayed by the third sub-pixel structure has a first saturation; and a fourth sub-pixel structure, the third color is displayed, and the third color displayed by the fourth sub-pixel structure has a second saturation, wherein the first saturation is different from the second saturation, the first sub-pixel structure, the second sub-pixel structure, the third sub-pixel structure, and the fourth sub-pixel The structures are juxtaposed to each other. In a first display mode, only one of the third sub-pixel structure and the fourth sub-pixel structure is turned on, and in a second display mode, the third sub-pixel structure is The fourth sub-pixel structure is turned on, wherein the first color is predetermined to display a gray scale of L1, the second color is predetermined to display a gray scale of L2, and the third color is predetermined to display a gray scale of L3. The average value of L1, L2, and L3 is Ave (L1, L2, L3), and L1, L2, and L3 are respectively compared with the average value Ave (L1, L2). The absolute value of the difference of L3) is |L i -Ave(L1,L2,L3)| _{i = 1 ~ 3} , and when the total gray level of the pixel structure is L0, L1, L2, L3 meet the following The relation (1) is displayed in the second display mode: |L i -Ave(L1, L2, L3)| _{i = 1 ~ 3} 5% × L0 (1). The pixel structure of claim 1, wherein an area of the third sub-pixel structure and an area of the fourth sub-pixel structure are equal to an area of the first sub-pixel structure or the second The area of the subpixel structure. The pixel structure of claim 1, wherein the third sub-pixel structure and the fourth sub-pixel structure are independently driven. The pixel structure of claim 1, wherein the first color, the second color, and the third color are red, blue, and green, respectively. The pixel structure of claim 1, wherein the first saturation is greater than the second saturation. The pixel structure of claim 5, wherein the transmittance of the third sub-pixel structure is lower than the transmittance of the fourth sub-pixel structure under the same display gray scale. The pixel structure of claim 1, wherein an area of the third sub-pixel structure accounts for 40% to 60% of a total area of the third sub-pixel structure and the fourth sub-pixel structure. %. The pixel structure according to claim 1, wherein when L1, L2, and L3 do not conform to the relation (1), the pixel structure is displayed in one of the first display mode and the second display mode. . The pixel structure of claim 1, wherein the first display mode is to turn on the third sub-pixel structure and close the fourth sub-pixel structure. The pixel structure of claim 1, wherein the first sub-pixel structure, the second sub-pixel structure, the third sub-pixel structure, and the fourth sub-pixel structure respectively have a first a color filter pattern, a second color filter pattern, a third color filter pattern, and a fourth color filter pattern. A display method for a pixel structure, comprising: performing an initial display mode according to the pixel structure as described in claim 1, wherein the initial display mode is one of the first display mode and the second display mode Reading the first color of the pixel structure, the second color, and the gray scale of the third color predetermined display, wherein the first color is predetermined to display a gray scale of L1, and the second color is predetermined to display gray The order is L2, the gray scale of the third color is predetermined to be L3, and the total gray level of the pixel structure is L0; the average value Ave (L1, L2, L3) of L1, L2, and L3 is calculated; The absolute value of the difference between L2 and L3 and the average value Ave (L1, L2, L3): |L i -Ave(L1, L2, L3)| _{i = 1 ~ 3} ; and whether L1, L2, L3 are consistent Relation (1): |L i -Ave(L1,L2,L3)| _{i = 1 ~ 3} 5%×L0; if L1, L2, and L3 are in the relationship (1), the display is performed in the second display mode, and if L1, L2, and L3 do not conform to the relational expression (1), the display is continued in the initial display mode. . The pixel structure of claim 11, wherein the initial display mode is the first display mode, and it is determined that L1, L2, and L3 do not conform to the relation (1), and the first display mode is continued. Display. The pixel structure according to claim 11, wherein the initial display mode is the second display mode, and it is determined that L1, L2, and L3 do not conform to the relation (1), and the second display mode is continued. Display.