TW201634984A - Pixel structure - Google Patents

Abstract

A pixel structure including a plurality of sub-pixels arranged in array is provided. Each of the sub-pixels includes an active device and a pixel electrode electrically connected to the active device, respectively. Each of the pixel electrode is defined with an disclination area and a plurality of domains separated by the disclination area, respectively, wherein only a portion of the sub-pixels further include a light-shielding pattern disposed corresponding to the disclination area.

Description

Pixel structure

The present invention relates to a pixel structure, and more particularly to a pixel structure that contributes to improving the color shift problem in side view.

Liquid crystal displays with superior space utilization efficiency, low power consumption, and no radiation have gradually become mainstream in the market. In order to make the liquid crystal display have better display quality, various wide-angle liquid crystal displays have been developed on the market, such as in-plane switching (IPS) liquid crystal display and fringe field switching liquid crystal. Display and multi-domain vertical alignment (MVA) liquid crystal displays.

Although the multi-domain vertical alignment type liquid crystal display has a wide viewing angle effect, the light transmittance (transportance) varies depending on the viewing angle. That is to say, when the user is looking at the side view display screen, the brightness displayed by the multi-domain vertical alignment type liquid crystal display may be different, which may cause problems such as insufficient color saturation and color shift on the display screen.

In order to improve the above problem, the prior art divides the pixel elements in the pixels into two regions, and couples the pixel electrodes in the two regions to different voltages, respectively, by changing the tilt angle of the liquid crystal. Improve problems such as insufficient color saturation and color shift in side view. However, such improvement has a significant effect on improving color saturation, but the effect of improving color shift still needs to be strengthened.

The present invention provides a pixel structure that contributes to improving the color shift problem in side view.

A pixel structure of the present invention includes a plurality of sub-pixels arranged in an array. Each sub-pixel includes an active element and a pixel electrode electrically connected to the active element. Each of the pixel electrodes defines an error direction area and a plurality of display fields separated by the misdirection area, wherein only a part of the sub-pixels further includes a light-shielding pattern corresponding to the misdirection area.

A pixel structure of the present invention includes a plurality of sub-pixels arranged in an array. Each sub-pixel includes an active element, a pixel electrode electrically connected to the active element, and a light shielding pattern. Each of the pixel electrodes defines an error direction area and a plurality of display fields separated by the wrong direction area. The shading pattern corresponds to the misalignment region, wherein the area of the shading pattern in the partial sub-pixel is different from the area of the shading pattern in the other sub-pixels.

A pixel structure of the present invention includes a plurality of sub-pixels arranged in an array. Each sub-pixel includes an active element, a pixel electrode electrically connected to the active element, and a light-shielding pattern corresponding to the misdirection area. Each of the pixel electrodes defines an error direction area and a plurality of display fields separated by the wrong direction area. The shading pattern corresponds to the misdirection area setting, wherein each sub-pixel has a main display area and a sub-display area, respectively, and the shading pattern is only distributed in the main display area.

A pixel structure of the present invention includes a plurality of sub-pixels arranged in an array. Each sub-pixel includes an active element and a pixel electrode electrically connected to the active element. Each of the pixel electrodes includes a trunk portion and a plurality of sets of branch portions connected to the trunk portion, and each group of branch portions is separated by a trunk portion, wherein a width of the trunk portion of the partial sub-pixels is different from that of the other sub-pixels The width.

A pixel structure of the present invention includes a first sub-pixel, a second sub-pixel, and a third sub-pixel. The first sub-pixel includes a first active element and a first pixel electrode electrically connected to the first active element. The first pixel electrode includes a first trunk portion and a plurality of sets of first branch portions connected to the first trunk portion, and each group of first branch portions is separated by the first trunk portion, wherein the first trunk portion includes a first longitudinal extension And a first lateral extension. The first longitudinal extension and the first lateral extension are staggered at the center of the first pixel electrode. The second sub-pixel includes a second active element and a second pixel electrode electrically connected to the second active element. The second pixel electrode includes a second stem portion and a plurality of sets of second branch portions connected to the second stem portion, and each set of second branch portions is separated by the second stem portion, wherein the second stem portion includes a second longitudinal extension And a second lateral extension. The second longitudinal extension and the second lateral extension are connected to the edge of the second pixel electrode. The third sub-pixel includes a third active element and a third pixel electrode electrically connected to the third active element. The third pixel electrode includes a third trunk portion and a plurality of sets of third branch portions connected to the third trunk portion, and each group of third branch portions is separated by a third trunk portion, wherein the third trunk portion includes a third longitudinal extension And a third lateral extension. The third longitudinal extension is connected to the third lateral extension to the edge of the third pixel electrode.

Based on the above, the above embodiment of the present invention modulates the light transmittance of different sub-pixels by changing at least one of the area of the light-shielding pattern, the width of the trunk portion, and the arrangement of the trunk portion in different sub-pixels. . Therefore, the pixel structure of the above embodiment of the present invention contributes to the improvement of the color shift problem in side view.

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

1A is a top plan view of a pixel structure in accordance with a first embodiment of the present invention, wherein a portion of the film layer is omitted from FIG. 1A. 1B and 1C are schematic cross-sectional views taken along line A-A' and B-B' of Fig. 1A, respectively. Referring first to FIG. 1A to FIG. 1C, the pixel structure 100 of the present embodiment includes a plurality of sub-pixels arranged in an array, such as a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. The sub-pixel is disposed, for example, on the substrate SUB. Further, a plurality of scanning lines SL (only one scanning line SL is schematically illustrated in FIG. 1A) and a plurality of data lines DL may be further disposed on the substrate SUB. The scan line SL and the data line DL are interlaced with each other to define the area where each sub-pixel SP is located. In addition, each sub-pixel is adapted to be driven by one of the scan lines SL and one of the data lines DL.

Further, each sub-pixel (including the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3) includes an active element AD and a pixel electrode PE, wherein each active element AD and a corresponding scan The line SL and the data line DL are electrically connected, and the pixel electrode PE is electrically connected to the active element AD. Each of the active elements AD includes, for example, a gate GE, a gate insulating layer GI, a channel layer CH, a source electrode SE, and a drain electrode DE, wherein the gate electrode GE is connected to the scan line SL, and the source electrode SE is connected to the data line DL. As shown in FIG. 1B and FIG. 1C, the active device AD is, for example, a bottom gate thin film transistor, wherein the gate GE is disposed on the substrate SUB, the gate insulating layer GI covers the gate GE, and the channel layer CH is disposed on the gate insulating layer GI. And above the gate GE, the source SE and the drain electrode DE are structurally separated from each other and extend from the gate insulating layer GI to the channel layer CH, respectively. However, the type and type of the active element AD can be changed according to design requirements, and is not limited to the above.

Each sub-pixel SP (including the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3) may further include an insulating layer IN. The insulating layer IN covers the active element AD, and the insulating layer IN is adapted to provide a flat bearing surface of the pixel electrode PE. In addition, the insulating layer IN has an opening O exposing the drain electrode DE, so that the pixel electrode PE is connected to the drain electrode DE through the opening O, thereby electrically connecting the active element AD and the pixel electrode PE.

Each of the pixel electrodes PE defines an error direction area A1 and a plurality of display areas A2 separated by the misdirection area A1. Further, each of the pixel electrodes PE includes a trunk portion MP and a plurality of sets of branch portions EP, wherein the trunk portion MP defines an error direction region A1. The branch portion EP is connected to the trunk portion MP, wherein each group branch portion EP is separated by the trunk portion MP, and each group branch portion EP corresponds to one of the display fields A2, respectively.

As shown in FIG. 1A, the shape of the trunk portion MP includes, for example, a cross shape which divides the pixel electrode PE into four display domains A2. In other words, each pixel electrode PE is a 4-display domain electrode. Further, the trunk portion MP includes a longitudinal extension portion MPa and a lateral extension portion MPb, wherein the longitudinal extension portion MPa and the lateral extension portion MPb are interleaved, for example, at the center of the pixel electrode PE. Each group branch portion EP includes a plurality of strip patterns PP extending obliquely and parallel to each other. The strip pattern PP of each group branch portion EP extends outward from the trunk portion MP, for example, and the strip patterns PP of the respective group branch portions EP are not parallel to each other and are not perpendicular to the longitudinal extension portion MPa and the lateral extension portion MPb. Further, the strip patterns PP located on both sides of the longitudinal extension portion MPa (or the lateral extension portion MPb) are, for example, symmetrically arranged such that the shape of each of the pixel electrodes PE is similar to a fishbone shape.

In this embodiment, only a part of the sub-pixels (such as at least one of the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3) further includes a shading corresponding to the misdirection area A1. Pattern BP. Further, the sub-pixel includes a plurality of first sub-pixels SP1, a plurality of second sub-pixels SP2, and a plurality of third sub-pixels SP3 (FIG. 1A only schematically illustrates a first sub-pixel SP1 , a second sub-pixel SP2 and a third sub-pixel SP3). The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 are alternately arranged, for example, in one direction, wherein the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 are, for example They are red sub-pixels, green sub-pixels, and blue sub-pixels, but are not limited to this.

FIG. 1D is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional 4 display domain pixel structure and the pixel structure of the first embodiment of the present invention, wherein FIG. 1D is in international illumination. The results of the measurement by the International Commission on Illumination (CIE) under the color coordinate system established in 1976, du' and dv' represent the offsets of the color coordinates u', v' when the gray scale changes. Further, the larger the value of dv', the more yellowish the tone of the display screen. Conversely, the smaller the value of dv', the more bluish the hue of the display picture. The larger the value of du', the more reddish the hue of the display screen. Conversely, the smaller the value of du', the more green the tone of the display screen. When the pixel structure 100 of FIG. 1A is applied to a liquid crystal display, liquid crystal molecules tilted along the longitudinal extension portion MPa are likely to leak light when viewed laterally, and liquid crystal molecules tilted along the lateral extension portion MPb are viewed from the longitudinal direction. It is easy to have light leakage. In the conventional 4 display domain pixel structure, each sub-pixel is provided with a light-shielding pattern to shield light leakage corresponding to the longitudinal extension MPa and the lateral extension MPb of FIG. 1A. However, in a structure in which each sub-pixel is configured with a light-shielding pattern BP, as shown in the circle of FIG. 1D, a high-gray display image (such as a white or skin-color display) is easily biased in side view. Yellow situation. In other words, when the display screen is a human face, when the user changes from front view to side view display screen, the perceived skin color may change from a rosy hue to a yellowish hue.

In this embodiment, only the second sub-pixel SP2 and the third sub-pixel SP3 further include a light-shielding pattern BP corresponding to the misdirection area A1 to improve the first one by reducing the shielding rate of the first sub-pixel SP1. The light transmittance of sub-pixel SP1. As shown by the thick solid line and the thick broken line of Fig. 1D, the design of this embodiment allows the du' to be shifted in the positive direction, that is, the proportion of red light in the side view is effectively raised. Therefore, the user can also see a rosy skin tone when viewing the screen sideways.

FIG. 1E is a diagram showing a relative relationship between a 45-degree side view brightness and a front view brightness of a conventional 4 display domain pixel structure, and FIG. 1F is a view showing a pixel structure of the first embodiment of the present invention at 45 degrees side brightness and its front view brightness. The relative relationship diagram, wherein the curves R, G, B, and W of FIG. 1E and FIG. 1F respectively represent the ratio of the luminance of the red, green, blue, and white light at 45 degrees to the brightness of the front view. As shown in FIG. 1E and FIG. 1F, the present embodiment further includes a design of the light-shielding pattern BP corresponding to the misdirection area A1 by only a part of the sub-pixels (such as the second sub-pixel SP2 and the third sub-pixel SP3). The light transmittance of the sub-pixel (for example, the first sub-pixel SP1) of the unconfigured light-shielding pattern BP in side view can be effectively improved. In other words, the above design of the embodiment can adjust the color tone exhibited by the screen in the side view, and contribute to the improvement of the color shift problem in the side view.

In the present embodiment, the shape of the light shielding pattern BP corresponds to the shape of the misdirection area A1. Corresponding to the shape may mean that the shape and the size are similar or may be similar in shape but different in size. As shown in FIG. 1A, the shape of the light-shielding pattern BP also includes a cross shape, and the size of the light-shielding pattern BP is, for example, smaller than the size of the misdirection area A1, so that the overlapping area of the light-shielding pattern BP and the misdirection area A1 is equal to the area of the light-shielding pattern BP. The light shielding pattern BP belongs to the same film layer as the scanning line SL and the gate electrode GE, for example, but is not limited thereto. In another embodiment, the light shielding pattern BP may also belong to the same film layer as the data line DL, the source SE, and the drain DE.

According to different design requirements, other components may be further disposed on the substrate SUB, such as the common electrode CE illustrated in FIG. 1A to FIG. 1C. The common electrode CE belongs to the same film layer as the light shielding pattern BP, the scanning line SL, and the gate electrode GE, for example, and the common electrode CE is, for example, surrounded on three sides of the pixel electrode PE and structurally separated from the common electrode CE, but is not limited thereto.

In the present embodiment, the potential of the light blocking pattern BP is, for example, a floating potential. In another embodiment, the light blocking pattern BP may also have the same potential as the pixel electrode PE. Alternatively, the light shielding pattern BP may have the same potential as the common electrode CE.

Incidentally, although the above embodiment has been described with the first sub-pixel SP1 as a red sub-pixel, the present invention is not limited thereto. According to different design requirements, the first sub-pixel SP1 (refers to the sub-pixel without the shading pattern BP) may also be a sub-pixel of other colors. The following embodiments may also be modified as such, and will not be described again.

2A is a top plan view of a pixel structure in accordance with a second embodiment of the present invention, wherein a portion of the film layer is omitted from FIG. 2A. 2B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional 8 display domain pixel structure and the pixel structure of the second embodiment of the present invention in a 45 degree side view. FIG. 2C is a diagram showing the relative relationship between the brightness of the 45-degree side view and the front view brightness of the conventional display field pixel structure. 2D is a diagram showing the relative relationship between the brightness of the pixel structure and the front view brightness at 45 degrees of the pixel structure of the second embodiment of the present invention. 2A to 2D, the pixel structure 200 of the present embodiment is substantially the same as the pixel structure 100, and the same components are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 200 and the pixel structure 100 is that the pixel electrodes PE' of the pixel structure 200 are 8 display domain electrodes.

Further, each of the pixel electrodes PE' of the embodiment includes a main pixel electrode PEM and a sub-pixel electrode PES, wherein the main pixel electrode PEM and the sub-pixel electrode PES are respectively, for example, by an opening O and an active element AD. 'The electric connection of the bungee. The active element AD' is, for example, a two-channel active element such that the main pixel electrode PEM and the sub-pixel electrode PES are respectively coupled to different voltages, but are not limited thereto. Methods for coupling the primary pixel electrode PEM and the secondary pixel electrode PES to different voltages are well known to those of ordinary skill in the art and will not be described again.

The main pixel electrode PEM and the sub-pixel electrode PES are, for example, 4 display domain electrodes, respectively. Specifically, the main pixel electrode PEM includes a first trunk portion MP1 and a plurality of sets of first branch portions EP1. The first branch portion EP1 is connected to the first trunk portion MP1, wherein each group of first branch portions EP1 is separated by the first trunk portion MP1, and each group of first branch portions EP1 corresponds to one of the display fields A2', respectively. The sub-pixel electrode PES includes a second trunk portion MP2 and a plurality of sets of second branch portions EP2. The second branch portion EP2 is connected to the second trunk portion MP2, wherein each group of second branch portions EP2 is separated by the second trunk portion MP2, and each group of second branch portions EP2 corresponds to one of the display fields A2', respectively. The design of the first trunk portion MP1, the first branch portion EP1, the second trunk portion MP2, and the second branch portion EP2 may adopt the design of the trunk portion MP and the branch portion EP in FIG. 1A, and details are not described herein again.

In the present embodiment, the first trunk portion MP1 and the second trunk portion MP2 together define an error direction area A1', wherein the shape of the light shielding pattern BP disposed in the misdirection area A1' corresponds to the shape of the misdirection area A1'. . As shown in FIG. 2A, the shape of the light shielding pattern BP includes, for example, two longitudinally arranged cross shapes, and the two cross shapes are connected to each other, for example, but are not limited thereto.

In this embodiment, the design of the light-shielding pattern BP corresponding to the misdirection area A1′ is further included by only a part of the sub-pixels (such as the second sub-pixel SP2′ and the third sub-pixel SP3′), which can effectively improve the unconfigured The light transmittance of the sub-pixel of the light-shielding pattern BP' (such as the first sub-pixel SP1') in side view. Each of the sub-pixels of the conventional 8-display domain pixel structure described in FIG. 2B and FIG. 2C is provided with a light-shielding pattern corresponding to the wrong-direction regions. Comparing the thick solid line and the thick broken line of FIG. 2B, the present embodiment can significantly increase the value of du' by displaying only the partial sub-pixel including the design of the light-shielding pattern BP corresponding to the wrong-direction area A1' (representing the display screen). The color tone turns red). In addition, in FIGS. 2C and 2D, the higher the normalized luminance value, the higher the grayscale value. In addition, the portion of each of the curves R, G, B, and W located above the oblique dotted line represents that the brightness in the side view is higher than the brightness in the front view; otherwise, the portion in which the curves R, G, B, and W are located below the oblique line represents The brightness in side view is lower than the brightness in front view. Comparing FIG. 2C and FIG. 2D , the present embodiment can significantly improve the brightness of the red light in the middle and high gray scale side view (the curve R is shifted upwards from the oblique dotted line) through the above design. In other words, the present embodiment can change the color tone exhibited by the display screen through the above design, and contribute to improving the color shift problem in side view.

3A is a top plan view of a pixel structure in accordance with a third embodiment of the present invention, wherein a portion of the film layer is omitted from FIG. 3A. FIG. 3B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the third embodiment of the present invention in a 45 degree side view. FIG. 3C is a diagram showing the relative relationship between the brightness of the pixel structure of the third embodiment of the present invention and the brightness of the front view at 45 degrees. Referring to FIG. 3A to FIG. 3C, the pixel structure 300 of the present embodiment is substantially the same as the pixel structure 200, and the same elements are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 300 and the pixel structure 200 is that each sub-pixel of the pixel structure 300 includes a light-shielding pattern (such as a light-shielding pattern BP, BP') corresponding to the misdirection area A1'. Further, the area of the light-shielding pattern BP' in the partial sub-pixel is different from the area of the light-shielding pattern BP in the other sub-pixels.

Further, each sub-pixel has a main display area and a secondary display area, wherein the main pixel electrode PEM is disposed in the main display area, and the sub-pixel electrode PES is disposed in the sub-display area. As shown in FIG. 3A, the first sub-pixel SP1'' has a first main display area M1 and a first display area S1, and the second sub-pixel SP2' has a second main display area M2 and a second display area S2. And the third sub-pixel SP3' has a third main display area M3 and a third display area S3.

In this embodiment, the light-shielding pattern BP' of the first sub-pixel SP1'' is only distributed in the first main display area M1 (or the first-time display area S1), and the light-shielding pattern of the second sub-pixel SP2' The BP is distributed in the second main display area M2 and the second display area S2, and the light shielding pattern BP of the third sub-pixel SP3' is distributed in the third main display area M3 and the third sub-display area S3. That is, the area of the light-shielding pattern BP' in the first sub-pixel SP1'' is smaller than the area of the light-shielding pattern BP in the second sub-pixel SP2' and the third sub-pixel SP3'.

By reducing the area of the light-shielding pattern in the partial sub-pixel (such as the first sub-pixel SP1'') (even if the area of the light-shielding pattern BP' in the first sub-pixel SP1'' is smaller than the second sub-pixel SP2 'and the area of the light-shielding pattern BP in the third sub-pixel SP3') can effectively increase the light transmittance of the partial sub-pixels in side view. Comparing the thick solid line and the thick broken line of FIG. 3B and comparing FIG. 2C and FIG. 3C, the present embodiment can change the color tone exhibited by the display screen through the above design, and help to improve the color shift problem in side view.

4A is a top plan view of a pixel structure in accordance with a fourth embodiment of the present invention, wherein a portion of the film layer is omitted from FIG. 4A. FIG. 4B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the fourth embodiment of the present invention in the 45 degree side view. 4C is a diagram showing the relative relationship between the brightness of the pixel structure and the front view brightness at 45 degrees of the pixel structure of the fourth embodiment of the present invention. 4A to 4C, the pixel structure 400 of the present embodiment is substantially the same as the pixel structure 300, and the same components are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 400 and the pixel structure 300 is that the area of the light blocking pattern BP'' distributed in the third display area S3 is different from the area of the light blocking pattern BP distributed in the second display area S2. In other words, in the pixel structure 400, the areas of the light-shielding patterns BP, BP', BP'' in the different sub-pixels are different.

By making the area of the light-shielding pattern BP'' distributed in the third display area S3 different from the area of the light-shielding pattern BP distributed in the second-time display area S2, for example, in the third sub-pixel SP3'' The area of the light-shielding pattern BP'' is smaller than the area of the light-shielding pattern BP in the second sub-pixel SP2', and the embodiment can further change (eg, boost) the light transmittance of the third sub-pixel SP3". By increasing the light transmittance of the blue sub-pixel, the yellowish display of the high gray scale can be improved by mixing blue light and yellow light into white light. As can be seen from FIG. 4B, FIG. 2C and FIG. 4C, the present embodiment can change the color tone exhibited by the display screen through the above design, and contributes to improving the color shift problem in side view.

FIG. 5A is a top plan view of a pixel structure in accordance with a fifth embodiment of the present invention, wherein FIG. 5A omits a partial film layer. FIG. 5B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the fifth embodiment of the present invention in a 45 degree side view. FIG. 5C is a diagram showing the relative relationship between the brightness of the pixel structure of the fifth embodiment of the present invention and the brightness of the front view at 45 degrees. 5A to 5C, the pixel structure 500 of the present embodiment is substantially the same as the pixel structure 400, and the same elements are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 500 and the pixel structure 400 is that the light shielding pattern BP of the first sub-pixel SP1 ′′′ is distributed in the first main display area M1 and the first display area S1, and is distributed in the third time. The area of the light-shielding pattern BP'' in the display area S3 is smaller than the area of the light-shielding pattern BP distributed in the first-time display area S1.

By reducing the area of the light-shielding pattern BP'' in the partial sub-pixel (such as the third sub-pixel SP3'') (even if the area of the light-shielding pattern BP'' is smaller than the area of the light-shielding pattern BP), the The light transmittance of some sub-pixels. As shown by the thin solid line and the thin broken line in FIG. 5B, the yellowishness of the display screen of the high gray scale in the side view can be improved by mixing yellow light and blue light into white light. In addition, comparing FIG. 2C and FIG. 5C, the present embodiment can improve the light transmittance of the third sub-pixel SP3 ′′ by the above design, thereby changing the color tone exhibited by the display screen and helping to improve the side. Time-dependent color shift problem.

Figure 6A is a top plan view of a pixel structure in accordance with a sixth embodiment of the present invention, wherein a portion of the film layer is omitted from Figure 6A. FIG. 6B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the sixth embodiment of the present invention in the 45 degree side view. FIG. 6C is a diagram showing the relative relationship between the brightness of the pixel structure and the front view brightness of the pixel structure of the sixth embodiment of the present invention. Referring to FIG. 6A to FIG. 6C, the pixel structure 600 of the present embodiment is substantially the same as the pixel structure 500, and the same components are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 600 and the pixel structure 500 is that the light shielding pattern BP' of the present embodiment is distributed only in the main display area (including the first main display area M1, the second main display area M2, and the third main display area M3). )Inside. In other words, the secondary display area of the embodiment is not provided with the light-shielding pattern BP′, that is, the light-shielding pattern BP′ is not distributed in the secondary display area (including the first display area S1, the second display area S2, and the third display area S3). )Inside. Further, the light-shielding pattern BP' is structurally separated from other light-shielding elements such as the common electrode CE.

By reducing the area of the shading pattern BP' in each sub-pixel (including the first sub-pixel SP1'', the second sub-pixel SP2'', and the third sub-pixel SP3''') (even if the shading pattern BP The area of 'the is smaller than the area of the light-shielding pattern BP in FIG. 5A' can effectively improve the light transmittance of each sub-pixel. As shown in FIG. 6B and FIG. 6C, through the above design, the present embodiment can change the color tone exhibited by the display screen, thereby contributing to the improvement of the color shift problem in side view.

Although the embodiment of FIGS. 3 to 6 is described with each pixel element being 8 display fields, the present invention is not limited thereto. In other embodiments, the pixel structure using the pixel electrode as the 4 display domain can also be improved as described above. Further, the method of improving the color shift problem in side view is not limited to changing the area of the light shielding pattern.

7 to 9 are top plan views of pixel structures in accordance with seventh to ninth embodiments of the present invention, respectively. Referring to FIG. 7, the pixel structure 700 of the present embodiment is substantially the same as the pixel structure 100, and the same components are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 700 and the pixel structure 100 is that the pixel structure 700 omits the configuration of the light-shielding pattern BP in FIG. 1A, and the width of the trunk portion MP in the partial sub-pixel is different from that in the other sub-pixels. The width of the trunk portion MP is to increase the light transmittance of the partial sub-pixels in side view, thereby improving the color shift problem in side view.

Specifically, when the pixel structure 700 is applied to a liquid crystal display, liquid crystal molecules tilted along the trunk portion MP are likely to leak light when viewed from the side. When the color filter layer of the liquid crystal display and the pixel structure 700 are disposed on the same side of the liquid crystal layer, the manner of changing the masking rate (or light transmittance) of the different sub-pixels by the arrangement of the light-shielding patterns is easy. The thickness of the color filter layer is thick and the shadowing effect is poor. By using the characteristic that the degree of light leakage in the side view is positively correlated with the width of the trunk portion MP, the present embodiment modulates the light transmittance of the different sub-pixels in the side view by increasing the width of the trunk portion MP in the partial sub-pixels. .

For example, in this embodiment, the width W1 of the trunk portion MP of the first sub-pixel SP1 ′′′′ is increased, so that the width W1 of the trunk portion MP of the first sub-pixel SP1 ′′′′ is larger than the second sub-picture. The width W2 of the trunk portion MP of the prime SP2''' is greater than the width W3 of the trunk portion MP of the first sub-pixel SP1"''. Thereby, the proportion of red light in the side view is improved, thereby improving the yellowing of the high gray scale display screen in side view. In this embodiment, the width W2 of the trunk portion MP of the second sub-pixel SP2"' is equal to, for example, the width W3 of the trunk portion MP of the third sub-pixel SP3"', and the width W1 is, for example, 11 micrometers. The widths W2 and W3 are, for example, 5 μm, but are not limited thereto.

Referring to FIG. 8, the pixel structure 800 of the present embodiment is substantially the same as the pixel structure 200, and the same components are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 800 and the pixel structure 200 is that the pixel structure 800 omits the configuration of the light-shielding pattern BP in FIG. 2A, and by making the trunk portion of the partial sub-pixel (such as the first trunk portion MP1 or the second) The width of the trunk portion MP2) is different from the width of the trunk portion in the other sub-pixels to enhance the light transmittance of the partial sub-pixels in side view, thereby improving the color shift problem in side view.

Specifically, the width of the first trunk portion MP1 and the second trunk portion MP2 in the first sub-pixel SP1′′′′′ is W1, and the first trunk portion MP1 in the second sub-pixel SP2′′′′ The width of the second trunk portion MP2 is W2, the width W3 of the first trunk portion MP1 in the third sub-pixel SP3"", and the second trunk portion MP2 in the third sub-pixel SP3"" Width W3'. In this embodiment, W3'>W1=W2=W3, that is, the embodiment only changes the width W3' of the second trunk portion MP2 in the third sub-pixel SP3"" to improve the third sub-pixel SP3. ''''The light transmittance in side view, using blue light and yellow light mixed into white light to improve the yellowish display of high gray scale display in side view. In one embodiment, the width W3' is, for example, 8 microns, and the widths W1, W2, W3 are, for example, 5 microns.

In another embodiment, the color shift problem in side view can also be improved by changing the light transmittance of the first subpixel SP1'''' in side view. For example, the width of the first trunk portion MP1 and the second trunk portion MP2 in the first sub-pixel SP1′′′′′ may be W1, and the first sub-pixel in the second sub-pixel SP2′′′′ The width of the cadre MP1 and the second trunk portion MP2 is W2, and the width of the first trunk portion MP1 and the second trunk portion MP2 in the third sub-pixel SP3"" is W3, and W1>W2=W3, wherein the width W1 is, for example, 11 microns, and the widths W2, W3 are, for example, 5 microns. Alternatively, the width of the first trunk portion MP1 in the first sub-pixel SP1′′′′′ may be W1, and the width of the second trunk portion MP2 in the first sub-pixel SP1′′′′′ is W1. ', the width of the first trunk portion MP1 and the second trunk portion MP2 in the second sub-pixel SP2''' is W2, and the first trunk portion MP1 and the third sub-pixel SP3"'' The width of the two trunks MP2 is W3, and W1'>W1=W2=W3, wherein the width W1' is, for example, 11 micrometers, and the widths W1, W2, W3 are, for example, 5 micrometers.

Further, the color shift problem at the time of side view can be improved by changing the light transmittance of the first sub-pixel SP1''''' and the third sub-pixel SP3'''' in side view. For example, the width of the first trunk portion MP1 in the first sub-pixel SP1′′′′′ may be W1, and the width of the second trunk portion MP2 in the first sub-pixel SP1′′′′′ is W1', the width of the first trunk portion MP1 and the second trunk portion MP2 in the second sub-pixel SP2"" is W2, and the width of the first trunk portion MP1 in the third sub-pixel SP3"" W3, and the width W3' of the second trunk portion MP2 in the third sub-pixel SP3"", and W1'>W3'>W1=W2=W3, wherein the width W1' is, for example, 11 micrometers, and the width W3' For example, 8 microns, and the widths W1, W2, W3 are, for example, 5 microns.

In addition, the light transmittance of the first sub-pixel SP1 ′′′′, the second sub-pixel SP 2 ′′′′, and the third sub-pixel SP 3 ′′′′ in side view can also be changed to improve Color shift problem in side view. For example, the width of the first trunk portion MP1 in the first sub-pixel SP1′′′′′ may be W1, and the width of the second trunk portion MP2 in the first sub-pixel SP1′′′′′ is W1', the width of the first trunk portion MP1 in the second sub-pixel SP2"' is W2, and the width of the second trunk portion MP2 in the second sub-pixel SP2"" is W2', and the third The width W3 of the first trunk portion MP1 in the sub-pixel SP3"'', and the width W3' of the second trunk portion MP2 in the third sub-pixel SP3"'', and W1'=W2'=W3 '>W1=W2=W3, where the widths W1', W2', W3' are, for example, 11 microns, and the widths W1, W2, W3 are, for example, 5 microns.

Referring to FIG. 9, the pixel structure 900 of the present embodiment is substantially the same as the pixel structure 800, and the same components are denoted by the same reference numerals and will not be described again. The main difference between the pixel structure 900 and the pixel structure 800 is the connection position of the longitudinal extension and the lateral extension.

Specifically, the first sub-pixel SP1''''' includes a first active element AD1' and a first pixel electrode PE1' electrically connected to the first active element AD1'. In the present embodiment, the first pixel electrode PE1' includes the first main pixel electrode PEM1 and the first sub-pixel electrode PES1, but is not limited thereto. The first main pixel electrode PEM1 includes a first trunk portion MP1 and a plurality of sets of first branch portions EP1 connected to the first trunk portion MP1, wherein each group of first branch portions EP1 is separated by the first trunk portion MP1, and first The trunk portion MP1 includes a first longitudinal extension portion MPa1 and a first lateral extension portion MPb1. The first longitudinal extension MPa1 and the first lateral extension MPb1 are staggered at the center of the first main pixel electrode PEM1 such that the first main pixel electrode PEM1 is a 4-display domain electrode. Similarly, the first pixel electrode PES1 includes a first trunk portion MP1' and a plurality of sets of first branch portions EP1' connected to the first trunk portion MP1', wherein each group of first branch portions EP1' is used by the first trunk portion The MP1' is separated, and the first trunk portion MP1' includes a first longitudinal extension MPa1' and a first lateral extension MPb1'. The first longitudinal extension MPa1' and the first lateral extension MPb1' are staggered at the center of the first sub-pixel electrode PES1 such that the first-order pixel electrode PES1 is a 4-display domain electrode.

The second sub-pixel SP2''''' includes a second active element AD2' and a second pixel electrode PE2' electrically connected to the second active element AD2'. In the present embodiment, the second pixel electrode PE2' includes the second main pixel electrode PEM2 and the second pixel electrode PES2, but is not limited thereto. The second main pixel electrode PEM2 includes a second trunk portion MP2 and a plurality of sets of second branch portions EP2 connected to the second trunk portion MP2, and each group of second branch portions EP2 is separated by the second trunk portion MP2, wherein the second portion The trunk portion MP2 includes a second longitudinal extension portion MPa2 and a second lateral extension portion MPb2. The second longitudinal extension MPa2 and the second lateral extension MPb2 are connected to the edge of the second main pixel electrode PEM2 such that the second main pixel electrode PEM2 is a 2 display domain electrode. Similarly, the second pixel electrode PES2 includes a second trunk portion MP2' and a plurality of sets of second branch portions EP2' connected to the second trunk portion MP2', and each group of second branch portions EP2' is used by the second trunk portion The MP2' is separated, wherein the second trunk portion MP2' includes a second longitudinal extension MPa2' and a second lateral extension MPb2'. The second longitudinal extension MPa2' and the second lateral extension MPb2' are connected to the edge of the second main pixel electrode PEM2' such that the second main pixel electrode PEM2' is a 2-display domain electrode.

The third sub-pixel SP3''''' includes a third active element AD3' and a third pixel electrode PE3' electrically connected to the third active element AD3'. In the present embodiment, the third pixel electrode PE3' includes the third main pixel electrode PEM3 and the third pixel electrode PES3, but is not limited thereto. The third main pixel electrode PEM3 includes a third trunk portion MP3 and a plurality of sets of third branch portions EP3 connected to the third trunk portion MP3, and each group of third branch portions EP3 is separated by the third trunk portion MP3, wherein the third portion The trunk portion MP3 includes a third longitudinal extension portion MPa3 and a third lateral extension portion MPb3. The third longitudinal extension MPa3 and the third lateral extension MPb3 are connected to the edge of the third main pixel electrode PEM3 such that the third main pixel electrode PEM3 is a 2-display domain electrode. Similarly, the third pixel electrode PES3 includes a third trunk portion MP3' and a plurality of sets of third branch portions EP3' connected to the third trunk portion MP3', and each group of third branch portions EP3' is used by the third trunk portion The MP3' is separated, wherein the third trunk portion MP3' includes a third longitudinal extension MPa3' and a third lateral extension MPb3'. The third longitudinal extension MPa3' and the third lateral extension MPb3' are connected to the edge of the third main pixel electrode PEM3' such that the third main pixel electrode PEM3' is a 2-display domain electrode.

Since the edges of the pixel electrodes (including the first pixel electrode PE1', the second pixel electrode PE2', and the third pixel electrode PE3') near the scan line SL and the data line DL are obscured by the black matrix of the liquid crystal display. Therefore, in this embodiment, the main portion of the pixel electrode of the partial sub-pixel (such as the second sub-pixel P2'''' and the third sub-pixel P3''''') is disposed at the edge of the pixel electrode. In order to shield the light leakage of the corresponding trunk portion by the black matrix, the degree of light leakage of the partial sub-pixels in the side view is reduced. In other words, in the embodiment, by changing the arrangement manner of the trunk portions in the partial sub-pixels, the light transmittance of the different sub-pixels in the side view can be modulated, thereby improving the color shift problem in the side view.

In this embodiment, the first pixel electrode PE1' is an 8-display domain electrode, and the second pixel electrode PE2' and the third pixel electrode PE3' are 4 display domain electrodes, wherein the third longitudinal extension MPa3' is The connection of the third lateral extension MPb3' with the connection of the third longitudinal extension MPa3' and the third lateral extension MPb3' is for example asymmetrically designed. In this way, when the pixel structure 900 is applied to the flexible display, even if the display is bent, the black matrix (not shown) is offset from the pixel structure, and the display field of the sub-pixels at different positions is blacked out. The above-mentioned design can still have the effect of improving the color shift due to the difference in the area exposed by the matrix.

In another embodiment, the first pixel electrode PE1' may also be a 4 display domain electrode, and the second pixel electrode PE2' and the third pixel electrode PE3' are 2 display domain electrodes. Alternatively, when the color shift is improved by increasing the light transmittance of the third subpixel SP3'''', the first pixel electrode PE1' and the second pixel electrode PE2' may be 2 display domains. The electrode, and the third pixel electrode PE3' is a 4-display domain electrode. Alternatively, the first pixel electrode PE1' and the second pixel electrode PE2' are 4 display domain electrodes, and the third pixel electrode PE3' is 8 display domain electrodes.

In summary, the above embodiment of the present invention modulates the light penetration of different sub-pixels by changing at least one of the area of the light-shielding pattern, the width of the trunk portion, and the arrangement of the trunk portion in different sub-pixels. Transmittance. Therefore, the pixel structure of the above embodiment of the present invention contributes to the improvement of the color shift problem in side view.

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.

100, 200, 300, 400, 500, 600, 700, 800, 900‧‧‧ pixel structure
A1, A1'‧‧‧ misdirected area
A2, A2'‧‧‧ display field
AD, AD'‧‧‧ active components
AD1'‧‧‧ first active component
AD2'‧‧‧Second active component
AD3'‧‧‧ third active component
BP, BP', BP''‧‧‧ shading pattern
CE‧‧‧Common electrode
CH‧‧‧ channel layer
DE‧‧‧汲
DL‧‧‧ data line
EP‧‧‧ Branch
EP1, EP1'‧‧‧ first branch
EP2, EP2'‧‧‧Second Branch
EP3, EP3'‧‧‧ Third Branch
GE‧‧‧ gate
GI‧‧‧ brake insulation
IN‧‧‧Insulation
M1‧‧‧ first main display area
M2‧‧‧Second main display area
M3‧‧‧ third main display area
MP‧‧‧Main Department
MP1, MP1'‧‧‧ First Main Department
MP2, MP2'‧‧‧ second backbone
MP3, MP3'‧‧‧ Third Chief
MPa‧‧‧ longitudinal extension
MPa1, MPa1'‧‧‧ first longitudinal extension
MPa2, MPa2'‧‧‧ second longitudinal extension
MPa3, MPa3'‧‧‧ third longitudinal extension
MPb‧‧‧Horizontal Extension
MPb1, MPb1'‧‧‧ first lateral extension
MPb2, MPb2'‧‧‧ second lateral extension
MPb3, MPb3'‧‧‧ third lateral extension
O‧‧‧ openings
PE, PE'‧‧‧ pixel electrodes
PE1'‧‧‧ first pixel electrode
PE2'‧‧‧second pixel electrode
PE3'‧‧‧ third pixel electrode
PEM‧‧‧ main picture electrode
PEM1‧‧‧ first main pixel electrode
PEM2‧‧‧second main pixel electrode
PEM3‧‧‧ third main pixel electrode
PES‧‧‧ pixel electrodes
PES1‧‧‧ first pixel electrode
PES2‧‧‧Second pixel electrode
PES3‧‧‧ third pixel electrode
PP‧‧‧ strip pattern
S1‧‧‧ first display area
S2‧‧‧Second display area
S3‧‧‧ third display area
SE‧‧‧ source
SL‧‧‧ scan line
SP1, SP1', SP1'', SP1''', SP1'''', SP1'''''‧‧‧ first sub-pixel
SP2, SP2', SP2'', SP2''', SP2'''', SP2'''''‧‧‧ second sub-pixel
SP3, SP3', SP3'', SP3''', SP3'''', SP3'''''‧‧‧ Third sub-pixel
SUB‧‧‧ substrate
R, G, B, W‧‧‧ curves
W1, W2, W3, W3'‧‧‧Width
A-A', B-B'‧‧‧ cut line

1A is a top plan view of a pixel structure in accordance with a first embodiment of the present invention. 1B and 1C are schematic cross-sectional views taken along line A-A' and B-B' of Fig. 1A, respectively. FIG. 1D is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional 4 display domain pixel structure and the pixel structure of the first embodiment of the present invention in a 45 degree side view. FIG. 1E is a diagram showing the relative relationship between the brightness of the 45-degree side view and the front view brightness of the conventional 4 display domain pixel structure. FIG. 1F is a diagram showing the relative relationship between the brightness of the pixel structure of the first embodiment of the present invention and the brightness of the front view at 45 degrees. 2A is a top plan view of a pixel structure in accordance with a second embodiment of the present invention. 2B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional 8 display domain pixel structure and the pixel structure of the second embodiment of the present invention in a 45 degree side view. FIG. 2C is a diagram showing the relative relationship between the brightness of the 45-degree side view and the front view brightness of the conventional display field pixel structure. 2D is a diagram showing the relative relationship between the brightness of the pixel structure and the front view brightness at 45 degrees of the pixel structure of the second embodiment of the present invention. 3A is a top plan view of a pixel structure in accordance with a third embodiment of the present invention. FIG. 3B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the third embodiment of the present invention in a 45 degree side view. FIG. 3C is a diagram showing the relative relationship between the brightness of the pixel structure of the third embodiment of the present invention and the brightness of the front view at 45 degrees. 4A is a top plan view of a pixel structure in accordance with a fourth embodiment of the present invention. FIG. 4B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the fourth embodiment of the present invention in the 45 degree side view. 4C is a diagram showing the relative relationship between the brightness of the pixel structure and the front view brightness at 45 degrees of the pixel structure of the fourth embodiment of the present invention. Figure 5A is a top plan view of a pixel structure in accordance with a fifth embodiment of the present invention. FIG. 5B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the fifth embodiment of the present invention in a 45 degree side view. FIG. 5C is a diagram showing the relative relationship between the brightness of the pixel structure of the fifth embodiment of the present invention and the brightness of the front view at 45 degrees. Figure 6A is a top plan view of a pixel structure in accordance with a sixth embodiment of the present invention. FIG. 6B is a diagram showing the relationship between the different gray scales and the color coordinate offsets of the conventional display field pixel structure and the pixel structure of the sixth embodiment of the present invention in the 45 degree side view. FIG. 6C is a diagram showing the relative relationship between the brightness of the pixel structure and the front view brightness of the pixel structure of the sixth embodiment of the present invention. 7 to 9 are top plan views of pixel structures in accordance with seventh to ninth embodiments of the present invention, respectively.

100‧‧‧ pixel structure

A1‧‧‧ misdirected area

A2‧‧‧Display field

AD‧‧‧ active components

BP‧‧‧ shading pattern

CE‧‧‧Common electrode

CH‧‧‧ channel layer

DE‧‧‧汲

DL‧‧‧ data line

EP‧‧‧ Branch

GE‧‧‧ gate

MP‧‧‧Main Department

MPa‧‧‧ longitudinal extension

MPb‧‧‧Horizontal Extension

O‧‧‧ openings

PE‧‧‧ pixel electrode

PP‧‧‧ strip pattern

SE‧‧‧ source

SL‧‧‧ scan line

SP1‧‧‧ first sub-pixel

SP2‧‧‧Second sub-pixel

SP3‧‧‧ Third sub-pixel

A-A’, B-B’‧‧‧ cut line

Claims (7)

A pixel structure includes: a first sub-pixel including a first active component and a first pixel electrode electrically connected to the first active component, the first pixel electrode including a first trunk and a plurality of sets of first branch portions connected to the first trunk portion, and each set of first branch portions is separated by the first trunk portion, wherein the first trunk portion includes a first longitudinal extension portion and a first lateral extension portion a first longitudinal extension and the first lateral extension are staggered at a center of the first pixel electrode; a second sub-pixel comprising a second active component and electrically connected to the second active component a second pixel electrode, the second pixel electrode includes a second trunk portion and a plurality of sets of second branch portions connected to the second trunk portion, and each group of second branch portions is separated by the second trunk portion Wherein the second trunk portion includes a second longitudinal extension portion and a second lateral extension portion, the second longitudinal extension portion and the second lateral extension portion are connected to an edge of the second pixel electrode; and a third sub-portion Pixel, including a third active component And a third pixel electrode electrically connected to the third active component, the third pixel electrode includes a third trunk portion and a plurality of third branch portions connected to the third trunk portion, and each group is third The branch portion is separated by the third trunk portion, wherein the third trunk portion includes a third longitudinal extension portion and a third lateral extension portion, the third longitudinal extension portion being coupled to the third lateral extension portion to the third portion The edge of the pixel electrode. The pixel structure of claim 1, wherein the first pixel electrodes respectively comprise a first main pixel electrode and a first sub-pixel electrode, the first main pixel electrode and the first The secondary pixel electrodes are all 4 display domain electrodes. The pixel structure of claim 1, wherein the second pixel electrodes respectively comprise a second main pixel electrode and a second sub-pixel electrode, the second main pixel electrode and the second The secondary pixel electrodes are all 2 display domain electrodes. The pixel structure of claim 1, wherein the third pixel electrode comprises a third main pixel electrode and a third sub-pixel electrode, the third main pixel electrode and the third The secondary pixel electrodes are all 2 display domain electrodes. The pixel structure of claim 1, wherein the second longitudinal extension of the second pixel electrode is disposed at an edge of the second pixel electrode. The pixel structure of claim 1, wherein the third longitudinal extension of the third pixel electrode is disposed at an edge of the third pixel electrode. The pixel structure of claim 1, wherein the first pixel electrode is an 8-display domain electrode, and the second pixel electrode and the third pixel electrode are both 4 display domain electrodes.