Dual cell liquid crystal display panel, driving method thereof and display device
By sharing a single substrate and scattering layer in the dual-cell liquid crystal display panel, the problems of color distortion and depth of field caused by light path deviation are solved, achieving a thinner and higher contrast display effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KUSN INFOVISION OPTOELECTRONICS
- Filing Date
- 2023-11-09
- Publication Date
- 2026-07-21
AI Technical Summary
Existing dual-cell LCD display panels suffer from severe optical path shift when viewed at an angle due to the large number of substrate layers and the large spacing between liquid crystal layers. This results in color distortion or depth issues in the color display, affecting the user experience. Furthermore, the overall thickness is relatively large.
By using a shared third substrate for the liquid crystal display cell and the dimming cell, the number of substrate layers is reduced, the OCA adhesive of the two intermediate substrates is eliminated, the spacing between liquid crystal layers is shortened, and the light path offset is reduced by the design of the scattering layer and polarizer on the shared substrate, thus improving the viewing angle-dependent display problem.
It effectively reduces optical path offset, avoids color distortion or depth of field issues in color display images at different viewing angles, and at the same time reduces the overall thickness of the module, improving the product's contrast and competitiveness.
Smart Images
Figure CN117492286B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology, and in particular to a dual-cell liquid crystal display panel, its driving method, and a display device. Background Technology
[0002] With the development of LCD technology, people have increasingly higher requirements for the image quality of LCD panels. Contrast ratio is a key performance indicator of LCD panels, greatly affecting their visual effect. Generally speaking, the higher the contrast ratio of an LCD panel, the clearer and more striking the picture, and the more vivid and vibrant the colors; while a low contrast ratio will make the entire picture appear hazy. Compared to traditional LCD panels, dual-cell LCD panels have a higher contrast ratio.
[0003] However, as Figure 1a and Figure 1b As shown, existing dual-cell LCD panels are generally made by stacking two separate LCD cells. These two LCD cells have four substrates and three polarizers. This not only makes the overall thickness of the dual-cell LCD panel thicker, but also makes the distance between the liquid crystal layers in the two LCD cells greater. This causes a large optical path offset when the module is viewed at an angle, which in turn causes color distortion or depth issues in the color display at different viewing angles, thus affecting the user experience. Summary of the Invention
[0004] The purpose of this invention is to provide a dual-cell liquid crystal display panel that can reduce the light path offset of the module when viewed at an angle, thereby improving or avoiding the problem of color distortion or depth of field in the color display image of the module at different viewing angles, and reducing the overall thickness of the module, thereby enhancing the quality of the module and the competitiveness of the product.
[0005] This invention provides a dual-cell liquid crystal display panel, comprising a liquid crystal display cell and a dimming cell stacked together, wherein the liquid crystal display cell is located on the light-emitting side of the dimming cell; the liquid crystal display cell includes a first substrate and a first liquid crystal layer, and the dimming cell includes a second substrate and a second liquid crystal layer, wherein the first substrate, the first liquid crystal layer, the second liquid crystal layer, and the second substrate are arranged sequentially; a third substrate is disposed between the first liquid crystal layer and the second liquid crystal layer and is spaced apart by the third substrate, and the liquid crystal display cell and the dimming cell share a third substrate; a color resist layer is disposed on the side of the first substrate near the first liquid crystal layer or on the side of the third substrate near the first liquid crystal layer.
[0006] In one possible implementation, the third substrate is a glass substrate, and the thickness of the third substrate is 0.18 mm to 0.22 mm.
[0007] In one possible implementation, a scattering layer is provided on the side of the third substrate near the second liquid crystal layer, and the scattering layer contains light-scattering particles.
[0008] In one possible implementation, the third substrate is a polyimide substrate, and the thickness of the third substrate is 0.05 mm to 0.1 mm.
[0009] In one possible implementation, the third substrate is a high-transmittance polyimide substrate with a transmittance greater than or equal to 98%, and a scattering layer is provided on the side of the third substrate near the second liquid crystal layer, wherein light-scattering particles are provided in the scattering layer.
[0010] In one possible implementation, the third substrate is a polyimide substrate with a certain degree of haze, the haze of the third substrate being greater than or equal to 40%.
[0011] In one possible implementation, a first polarizer is provided on the side of the first substrate away from the first liquid crystal layer, a second polarizer is provided on the side of the second substrate away from the second liquid crystal layer, and no polarizer is provided between the liquid crystal display cell and the dimming cell.
[0012] In one possible implementation, the liquid crystal display cell is provided with a first pixel electrode and a first common electrode cooperating with the first pixel electrode. The first pixel electrode is disposed on the first substrate near the first liquid crystal layer or on the third substrate near the first liquid crystal layer. The first common electrode is disposed on the first substrate near the first liquid crystal layer or on the third substrate near the first liquid crystal layer. The dimming cell is provided with a second pixel electrode and a second common electrode cooperating with the second pixel electrode. The second pixel electrode is disposed on the second substrate near the second liquid crystal layer or on the third substrate near the second liquid crystal layer. The second common electrode is disposed on the second substrate near the second liquid crystal layer or on the third substrate near the second liquid crystal layer.
[0013] The present invention also provides a driving method applied to the above-mentioned dual-cell liquid crystal display panel; the liquid crystal display cell is provided with a plurality of first sub-pixels arranged in an array, and the dimming cell is provided with a plurality of second sub-pixels arranged in an array, each second sub-pixel corresponding to one or more first sub-pixels; the driving method includes:
[0014] When a first sub-pixel in the liquid crystal display cell is in a bright state, a second sub-pixel corresponding to the first sub-pixel and a plurality of second sub-pixels surrounding the corresponding second sub-pixel in the dimming cell are controlled to simultaneously display in a bright state. The plurality of second sub-pixels surrounding the corresponding second sub-pixel include: a plurality of second sub-pixels that are adjacent to the corresponding second sub-pixel along the scan line direction and the data line direction of the dual-cell liquid crystal display panel, respectively.
[0015] The present invention also provides a display device, including the above-described dual-cell liquid crystal display panel.
[0016] The dual-cell liquid crystal display panel provided by this invention shares a third substrate with the liquid crystal display cell and the dimming cell. This reduces the number of substrate layers and eliminates the need for OCA adhesive to bond the two intermediate substrates, thereby reducing the spacing between the first and second liquid crystal layers. This reduces the optical path offset when the module is viewed at an angle, thus improving or preventing color distortion or depth issues in the color display at different viewing angles, enhancing the module's overall appearance. Furthermore, this structure can reduce the overall thickness of the module, further improving the product's competitiveness. Attached Figure Description
[0017] Figure 1a This is a cross-sectional schematic diagram of a dual-cell liquid crystal display panel in the prior art.
[0018] Figure 1b for Figure 1a The optical path diagram.
[0019] Figure 2a This is a cross-sectional schematic diagram of the dual-cell liquid crystal display panel in the first embodiment of the present invention.
[0020] Figure 2b for Figure 2a The optical path diagram.
[0021] Figure 3a This is a schematic diagram of the circuit structure of the liquid crystal display cell in the first embodiment of the present invention.
[0022] Figure 3b This is a schematic diagram of the circuit structure of the dimming box in the first embodiment of the present invention.
[0023] Figure 4 This is a schematic diagram of the structure of the dual-cell liquid crystal display panel in the first embodiment of the present invention when a single first sub-pixel is in a bright state.
[0024] Figure 5a This is a cross-sectional schematic diagram of the dual-cell liquid crystal display panel in the second embodiment of the present invention.
[0025] Figure 5b for Figure 5a The optical path diagram.
[0026] Figure 6 This is a cross-sectional schematic diagram of the dual-cell liquid crystal display panel in the third embodiment of the present invention.
[0027] Figure 7 This is a schematic diagram of the structure of the dual-cell liquid crystal display panel in the fourth embodiment of the present invention when a single first sub-pixel is in a bright state. Detailed Implementation
[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0029] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0030] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this invention are defined by the position of the structures in the drawings and the relative positions of the structures, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.
[0031] Figure 1a This is a cross-sectional schematic diagram of a dual-cell liquid crystal display panel in the prior art. Figure 1b for Figure 1a The optical path diagram. For example... Figure 1aAs shown, the dual-cell liquid crystal display panel includes a liquid crystal display cell 5 and a dimming cell 6 stacked together. The liquid crystal display cell 5 includes a first color filter substrate 51 and a first array substrate 52 disposed opposite to each other, and a first liquid crystal layer 53 located between the first color filter substrate 51 and the first array substrate 52. A color resist layer 56 is provided on the first color filter substrate 51, so the liquid crystal display cell 5 can perform color display. The liquid crystal display cell 5 also has a first pixel electrode 54 and a first common electrode 55 that cooperate with each other. The dimming cell 6 includes a second color filter substrate 61 and a second array substrate 62 disposed opposite to each other, and a second liquid crystal layer 63 located between the second color filter substrate 61 and the second array substrate 62. However, the dimming cell 6 does not have a color resist layer, so the dimming cell 6 can perform pure grayscale display (i.e., black and white display) to perform regional dimming of the liquid crystal display cell 5, thereby improving the contrast. The dimming cell 6 also has a second pixel electrode 64 and a second common electrode 65 that cooperate with each other. Meanwhile, a first polarizer 71 is provided on the side of the first color filter substrate 51 away from the first liquid crystal layer 53, a second polarizer 72 is provided between the first array substrate 52 and the second color filter substrate 61, a third polarizer 73 is provided on the side of the second array substrate 62 away from the second liquid crystal layer 63, and the first array substrate 52 and the second color filter substrate 61 are connected by OCA adhesive 8.
[0032] The liquid crystal display cell 5 has multiple first sub-pixels SP1 arranged in an array, and the dimming cell 6 has multiple second sub-pixels SP2 arranged in an array. Each second sub-pixel SP2 corresponds to one or more first sub-pixels SP1, that is, the length and width of the second sub-pixel SP2 are n times the length of the first sub-pixel SP1, where n is a positive integer greater than or equal to 1. Figure 1a The diagram illustrates that the length and width of the second sub-pixel SP2 are three times the length of the first sub-pixel SP1, which is a 1:(3*3) design, meaning that each second sub-pixel SP2 corresponds to nine first sub-pixels SP1.
[0033] Because a first array substrate 52, OCA adhesive 8, a second polarizer 72, and a second color filter substrate 61 are disposed between the first liquid crystal layer 53 and the second liquid crystal layer 63, not only is the overall thickness of the module relatively large, but also... Figure 1b As shown, the module's color display may exhibit color distortion or depth-of-field issues at different viewing angles, thus affecting the user experience. Specifically, as... Figure 1bAs shown, taking a certain G sub-pixel in the liquid crystal display cell 5 as an example, when viewed from the front, the backlight of the G sub-pixel comes from its corresponding second sub-pixel SP2b; when viewed from a 45° oblique angle, due to the large distance between the first liquid crystal layer 53 and the second liquid crystal layer 63, the light path is offset, and the backlight of the G sub-pixel comes from the second sub-pixel SP2a. However, the second sub-pixel SP2a does not correspond to the G sub-pixel. If the grayscale brightness of the second sub-pixel SP2b and the second sub-pixel SP2a is different at this time (for example, the second sub-pixel SP2a is dark and the second sub-pixel SP2b is bright), then the display brightness of the G sub-pixel perceived by the user at the front and 45° oblique angles will change, that is, the color display screen will have color distortion or depth of field problems at different viewing angles. To improve the color distortion or depth of field issues, the size of the second sub-pixel SP2 is generally designed to be larger, typically using a 1:(14*14) design. This means that the length and width of the second sub-pixel SP2 are 14 times the length of the first sub-pixel SP1, or each second sub-pixel SP2 corresponds to 196 first sub-pixels SP1. By increasing the area of the second sub-pixel SP2, the color distortion or depth of field issues are improved. However, this method is not convenient for the dimming box 6 to perform regional dimming on the liquid crystal display box 5, which will reduce the dimming effect of the dimming box 6 and thus affect the contrast of the dual-box liquid crystal display panel.
[0034] First Embodiment
[0035] Figure 2a This is a cross-sectional schematic diagram of the dual-cell liquid crystal display panel in the first embodiment of the present invention. Figure 2b for Figure 2a The optical path diagram. For example... Figure 2a and Figure 2bAs shown, this embodiment of the invention provides a dual-cell liquid crystal display panel, including a liquid crystal display cell 1 and a dimming cell 2 stacked together. The liquid crystal display cell 1 is located on the light-emitting side (i.e., the side closer to the user) of the dimming cell 2. The liquid crystal display cell 1 is capable of color display, and the dimming cell 2 is capable of pure grayscale display (i.e., black and white display) to perform regional dimming of the liquid crystal display cell 1, thereby improving contrast. The liquid crystal display cell 1 includes a first substrate 11 and a first liquid crystal layer 12, and the dimming cell 2 includes a second substrate 21 and a second liquid crystal layer 22. The first substrate 11, the first liquid crystal layer 12, the second liquid crystal layer 22, and the second substrate 21 are arranged sequentially. A third substrate 13 is provided between the first liquid crystal layer 12 and the second liquid crystal layer 22 and is spaced apart by the third substrate 13. The liquid crystal display cell 1 and the dimming cell 2 share a third substrate 13. A color resist layer 14 is provided on the side of the first substrate 11 near the first liquid crystal layer 12 or on the side of the third substrate 13 near the first liquid crystal layer 12 (in this embodiment, the color resist layer 14 is provided on the side of the first substrate 11 near the first liquid crystal layer 12). Meanwhile, the dual-cell LCD panel is also equipped with a backlight (not shown in the figure), which is located on the side of the dimming box 2 away from the LCD box 1.
[0036] like Figures 2a to 3b As shown, the liquid crystal display box 1 has a plurality of first sub-pixels SP1 arranged in an array, and the dimming box 2 has a plurality of second sub-pixels SP2 arranged in an array. The size of the second sub-pixels SP2 is greater than or equal to the size of the first sub-pixels SP1. Each second sub-pixel SP2 corresponds to a plurality of or a first sub-pixel SP1 (the figure shows that the length and width of the second sub-pixel SP2 are 3 times the length of the first sub-pixel SP1, which is a 1:(3*3) design, that is, each second sub-pixel SP2 corresponds to 9 first sub-pixels SP1).
[0037] like Figure 2b As shown, since the liquid crystal display cell 1 and the dimming cell 2 in this embodiment share a third substrate 13, the number of substrate layers is reduced, and the OCA adhesive used to bond the two intermediate substrates is eliminated. This greatly reduces the spacing between the first liquid crystal layer 12 and the second liquid crystal layer 22, reduces the optical path offset of the module when viewed at an angle, and thus improves or avoids the problem of color distortion or depth of field in the color display image of the module at different viewing angles. Specifically, as Figure 2bAs shown, taking a certain G sub-pixel in the liquid crystal display cell 1 as an example, when viewed from the front, the backlight of the G sub-pixel comes from its corresponding second sub-pixel SP2; when viewed from a 45° oblique angle, the distance between the first liquid crystal layer 12 and the second liquid crystal layer 22 is shortened, and the light path offset is reduced. At this time, the backlight of the G sub-pixel still comes from its corresponding second sub-pixel SP2. Therefore, the display brightness of the G sub-pixel perceived by the user at the front and 45° oblique angles will not change significantly, and there will be no color distortion or depth of field problem. Meanwhile, since the spacing between the first liquid crystal layer 12 and the second liquid crystal layer 22 is greatly shortened, the size of the second sub-pixel SP2 can be reduced (in this embodiment, the dual-cell liquid crystal display panel can adopt a 1:(6*6) design, that is, the length and width of the second sub-pixel SP2 are 6 times the length of the first sub-pixel SP1, that is, each second sub-pixel SP2 corresponds to 36 first sub-pixels SP1, which can achieve the purpose of avoiding color change or depth of field problems), thereby facilitating the dimming box 2 to perform regional dimming on the liquid crystal display box 1, improving the dimming effect of the dimming box 2, and thus improving the contrast of the dual-cell liquid crystal display panel.
[0038] The dual-cell liquid crystal display panel provided in this embodiment shares a third substrate 13 between the liquid crystal display cell 1 and the dimming cell 2. This reduces the number of substrate layers and eliminates the need for OCA adhesive to bond the two intermediate substrates, thereby reducing the spacing between the first liquid crystal layer 12 and the second liquid crystal layer 22. This reduces the optical path offset of the module when viewed at an angle, thus improving or preventing color distortion or depth issues in the color display at different viewing angles and enhancing the module's overall appearance. Furthermore, this structure can reduce the overall thickness of the module, further improving the product's competitiveness.
[0039] In one embodiment, the third substrate 13 is a transparent glass substrate with a thickness of 0.18 mm to 0.22 mm (i.e., 0.2 ± 0.02 mm). Compared with existing glass substrates, its thickness is further reduced (the thickness of existing glass substrates is generally around 0.5 mm), thereby further improving the problem of color change or depth of field and reducing the overall thickness of the module.
[0040] In one embodiment, the first substrate 11 and the second substrate 21 are also transparent glass substrates. The thickness of the first substrate 11 and the second substrate 21 is 0.18mm to 0.22mm (i.e. 0.2±0.02mm). Compared with existing glass substrates, their thickness is further reduced, thereby further reducing the overall thickness of the module.
[0041] like Figure 2aAs shown, in one embodiment, a scattering layer 24 is provided on the third substrate 13 near the second liquid crystal layer 22, and the scattering layer 24 contains light-scattering particles 241. The scattering layer 24 can be formed by coating the light-scattering particles 241 and a solvent onto the third substrate 13 and then curing them. The scattering layer 24 can refract and scatter light, increase the light emission angle, thereby expanding the viewing angle range and further improving the problems of color distortion or depth of field (specifically, such as...). Figure 2b As shown, due to the refraction and scattering effect of the scattering layer 24 on light, the backlight of the first sub-pixel SP1 can be sourced from the corresponding second sub-pixel SP2 as much as possible at both the frontal and 45° oblique viewing angles. That is, the display brightness of the first sub-pixel SP1 perceived by the user at both the frontal and 45° oblique viewing angles will not change, and there will be no color distortion or depth of field issues.
[0042] like Figure 2a As shown, in one embodiment, a first polarizer 31 is provided on the side of the first substrate 11 away from the first liquid crystal layer 12, and a second polarizer 32 is provided on the side of the second substrate 21 away from the second liquid crystal layer 22. No polarizer is provided between the liquid crystal display cell 1 and the dimming cell 2, thereby further reducing the spacing between the first liquid crystal layer 12 and the second liquid crystal layer 22, improving the problem of color distortion or depth of field, and further reducing the overall thickness of the module.
[0043] like Figure 2a As shown, in one embodiment, the color resist layer 14 includes multiple red resist blocks, multiple green resist blocks, and multiple blue resist blocks. The multiple red resist blocks, multiple green resist blocks, and multiple blue resist blocks are respectively disposed in multiple first sub-pixels SP1, and adjacent resist blocks are separated by a black matrix (not labeled in the figure) to form sub-pixels of three colors: red (R), green (G), and blue (B).
[0044] like Figure 2a and Figure 3a As shown, in one embodiment, the liquid crystal display cell 1 is provided with a first pixel electrode 15 and a first common electrode 16 cooperating with the first pixel electrode 15. The first pixel electrode 15 is disposed on the side of the first substrate 11 near the first liquid crystal layer 12 or on the side of the third substrate 13 near the first liquid crystal layer 12. The first common electrode 16 is disposed on the side of the first substrate 11 near the first liquid crystal layer 12 or on the side of the third substrate 13 near the first liquid crystal layer 12 (in this embodiment, the first pixel electrode 15 is disposed on the side of the third substrate 13 near the first liquid crystal layer 12, and the first common electrode 16 is disposed on the side of the first substrate 11 near the first liquid crystal layer 12). There are multiple first pixel electrodes 15, and the multiple first pixel electrodes 15 are respectively disposed in multiple first sub-pixels SP1.
[0045] The dual-cell liquid crystal display panel has a scan line direction X and a data line direction Y. The liquid crystal display cell 1 has multiple first scan lines 18 extending along the scan line direction X and multiple first data lines 19 extending along the data line direction Y. The multiple first scan lines 18 and multiple first data lines 19 are mutually insulated and intersecting to form multiple first sub-pixels SP1. The liquid crystal display cell 1 has multiple first thin-film transistors 17, which are respectively disposed in the multiple first sub-pixels SP1. Each first pixel electrode 15 is electrically connected to the corresponding first scan line 18 and first data line 19 through the first thin-film transistor 17. The first thin-film transistors 17, first scan lines 18 and first data lines 19 are disposed on the same substrate as the first pixel electrode 15.
[0046] like Figure 2a and Figure 3b As shown, in one embodiment, the dimming box 2 is provided with a second pixel electrode 25 and a second common electrode 26 cooperating with the second pixel electrode 25. The second pixel electrode 25 is disposed on the side of the second substrate 21 near the second liquid crystal layer 22 or on the side of the third substrate 13 near the second liquid crystal layer 22. The second common electrode 26 is disposed on the side of the second substrate 21 near the second liquid crystal layer 22 or on the side of the third substrate 13 near the second liquid crystal layer 22 (in this embodiment, the second pixel electrode 25 is disposed on the side of the second substrate 21 near the second liquid crystal layer 22, and the second common electrode 26 is disposed on the side of the third substrate 13 near the second liquid crystal layer 22). There are multiple second pixel electrodes 25, and the multiple second pixel electrodes 25 are respectively disposed in multiple second sub-pixels SP2.
[0047] The dimming box 2 has multiple second scan lines 28 extending along the scan line direction X and multiple second data lines 29 extending along the data line direction Y. The multiple second scan lines 28 and multiple second data lines 29 are mutually insulated and intersecting to form multiple second sub-pixels SP2. The dimming box 2 has multiple second thin-film transistors 27, which are respectively disposed in the multiple second sub-pixels SP2. Each second pixel electrode 25 is electrically connected to the corresponding second scan line 28 and second data line 29 through the second thin-film transistor 27. The second thin-film transistors 27, the second scan lines 28 and the second data lines 29 and the second pixel electrode 25 are disposed on the same substrate.
[0048] In one embodiment, the edges of the first substrate 11 and the third substrate 13, as well as the edges of the second substrate 21 and the third substrate 13, are bonded and fixed by frame adhesive (not shown).
[0049] like Figure 2a and Figure 4As shown, this embodiment of the invention also provides a driving method applied to the aforementioned dual-cell liquid crystal display panel. The liquid crystal display cell 1 has a plurality of first sub-pixels SP1 arranged in an array, and the dimming cell 2 has a plurality of second sub-pixels SP2 arranged in an array, each second sub-pixel SP2 corresponding to one or more first sub-pixels SP1; the driving method includes:
[0050] When a first sub-pixel SP1 in the liquid crystal display cell 1 is in a bright state, a second sub-pixel SP2 corresponding to the first sub-pixel SP1 and a plurality of second sub-pixels SP2 surrounding the corresponding second sub-pixel SP2 in the dimming cell 2 are simultaneously displayed in a bright state (preferably, the display brightness of the second sub-pixel SP2 corresponding to the first sub-pixel SP1 and the plurality of second sub-pixels SP2 surrounding the corresponding second sub-pixel SP2 is the same). The plurality of second sub-pixels SP2 surrounding the corresponding second sub-pixel SP2 includes a plurality of second sub-pixels SP2 adjacent to the corresponding second sub-pixel SP2 along the scan line direction X and data line direction Y of the dual-cell liquid crystal display panel.
[0051] Specifically, such as Figure 4 As shown schematically, the dual-cell LCD panel adopts a 1:(3*3) design, meaning that each second sub-pixel SP2 corresponds to 9 first sub-pixels SP1. When a first sub-pixel SP1 in the LCD cell 1 is lit, a second sub-pixel SP2 located directly below the first sub-pixel SP1 and four second sub-pixels SP2 surrounding the first sub-pixel SP1 in the dimming cell 2 are simultaneously lit (i.e., a total of 5 second sub-pixels SP2 are lit, and these 5 second sub-pixels SP2 intersect in a cross shape along the scan line direction X and the data line direction Y). Figure 4 The second sub-pixel SP2, indicated by a shadow, is displayed in a bright state. Preferably, the display brightness of the five second sub-pixels SP2 is the same (or substantially the same), so that the display brightness of the first sub-pixel SP1 perceived by the user at both a normal viewing angle and a 45° oblique viewing angle does not change, thus avoiding color distortion or depth-of-field issues. Therefore, this method can effectively improve the problems of color distortion or depth of field.
[0052] like Figure 7 As shown, in another implementation, when the dual-cell liquid crystal display panel adopts a 1:(1*1) design, that is, when the second sub-pixel SP2 corresponds one-to-one with the first sub-pixel SP1, this method can more significantly improve the problems of color distortion or depth of field. The reason is that: Figure 4As shown, when each second sub-pixel SP2 corresponds to multiple first sub-pixels SP1, since the size of the second sub-pixel SP2 is larger than that of a single first sub-pixel SP1, the backlight of the first sub-pixel SP1 can more easily originate from the corresponding second sub-pixel SP2 at both the frontal and 45° oblique viewing angles. Figure 7 As shown, when the second sub-pixel SP2 corresponds one-to-one with the first sub-pixel SP1, since the second sub-pixel SP2 and the first sub-pixel SP1 have the same size, the backlight of the first sub-pixel SP1 comes from the corresponding second sub-pixel SP2 when viewed from the front. However, when viewed from a 45° oblique angle, the backlight of the first sub-pixel SP1 is not easily derived from the corresponding second sub-pixel SP2. In this case, by simultaneously illuminating multiple second sub-pixels SP2 around the corresponding second sub-pixel SP2, the backlight of the first sub-pixel SP1 can come from the corresponding second sub-pixel SP2 or its surrounding second sub-pixels SP2 when viewed from a 45° oblique angle, thus avoiding color distortion or depth of field problems.
[0053] This invention also provides a display device, including the dual-cell liquid crystal display panel described above.
[0054] The dual-cell liquid crystal display panel provided in this embodiment shares a third substrate 13 between the liquid crystal display cell 1 and the dimming cell 2. This reduces the number of substrate layers and eliminates the need for OCA adhesive to bond the two intermediate substrates, thereby reducing the spacing between the first liquid crystal layer 12 and the second liquid crystal layer 22. This reduces the optical path offset of the module when viewed at an angle, thus improving or preventing color distortion or depth issues in the color display at different viewing angles and enhancing the module's overall appearance. Furthermore, this structure can reduce the overall thickness of the module, further improving the product's competitiveness.
[0055] Second Embodiment
[0056] Figure 5a This is a cross-sectional schematic diagram of the dual-cell liquid crystal display panel in the second embodiment of the present invention. Figure 5b for Figure 5a The optical path diagram. For example... Figure 5a and Figure 5b As shown, the dual-cell liquid crystal display panel provided in the second embodiment of the present invention is basically the same as that in the first embodiment, except that the material of the third substrate 13 is different.
[0057] Specifically, in this embodiment, the third substrate 13 is a polyimide substrate, that is, it is made of polyimide material (similar to PI film material, which has good structural strength, high and low temperature resistance and insulation properties, and compared with glass of the same thickness, it has no risk of breakage and can be used for circuit processing). The thickness of the third substrate 13 is 0.05mm to 0.1mm. By using a polyimide substrate instead of a glass substrate, the thickness of the third substrate 13 can be further reduced, thereby further improving the color distortion or depth of field problem and reducing the overall thickness of the module. Moreover, the size of the second sub-pixel SP2 can be further reduced (in this embodiment, the dual-cell liquid crystal display panel can adopt a 1:(4*4) design, or even a 1:(1*1) design), which is beneficial for the dimming box 2 to perform regional dimming of the liquid crystal display box 1, improve the dimming effect of the dimming box 2, and thus improve the contrast of the dual-cell liquid crystal display panel.
[0058] like Figure 5a and Figure 5b As shown, in one embodiment, the third substrate 13 is a polyimide substrate with a certain degree of haze (i.e., the third substrate 13 is a semi-transparent substrate), and the haze of the third substrate 13 is greater than or equal to 40%. Therefore, the third substrate 13 inherently possesses haze, enabling it to refract and scatter light, increasing the light emission angle, expanding the viewing angle range, and further improving the problems of color distortion or depth of field. Moreover, there is no need to provide a scattering layer on the lower surface of the third substrate 13, thereby simplifying the manufacturing process (of course, in other embodiments, a scattering layer can also be provided on the lower surface of the third substrate 13).
[0059] The other structures and principles of this embodiment are the same as or similar to those of the first embodiment, and will not be described in detail here.
[0060] Third Embodiment
[0061] Figure 6 This is a cross-sectional schematic diagram of the dual-cell liquid crystal display panel in the third embodiment of the present invention, as shown below. Figure 6 As shown, the dual-cell liquid crystal display panel provided in the third embodiment of the present invention is basically the same as that in the second embodiment. The third substrate 13 is also a polyimide substrate, and the thickness of the third substrate 13 is 0.05mm to 0.1mm. The difference is that in this embodiment, the third substrate 13 is a high-transmittance polyimide substrate with a light transmittance greater than or equal to 98%. A scattering layer 24 is provided on the side of the third substrate 13 near the second liquid crystal layer 22, and light-scattering particles 241 are provided in the scattering layer 24. The scattering layer 24 can refract and scatter light, increase the light emission angle, thereby expanding the viewing angle range and further improving the problems of color distortion or depth of field.
[0062] The other structures and principles of this embodiment are the same as or similar to those of the second embodiment, and will not be described in detail here.
[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A driving method for driving a dual-cell liquid crystal display panel, characterized in that, The dual-cell liquid crystal display panel includes a stacked liquid crystal display cell (1) and a dimming cell (2), wherein the liquid crystal display cell (1) is located on the light-emitting side of the dimming cell (2); the liquid crystal display cell (1) includes a first substrate (11) and a first liquid crystal layer (12), and the dimming cell (2) includes a second substrate (21) and a second liquid crystal layer (22), wherein the first substrate (11), the first liquid crystal layer (12), the second liquid crystal layer (22) and the second substrate (21) are arranged in sequence; a third substrate (13) is provided between the first liquid crystal layer (12) and the second liquid crystal layer (22) and is separated by the third substrate (13), wherein the liquid crystal display cell (1) and the dimming cell (2) share a third substrate (13); a color resist layer (14) is provided on the side of the first substrate (11) near the first liquid crystal layer (12) or on the side of the third substrate (13) near the first liquid crystal layer (12). The liquid crystal display cell (1) is provided with a plurality of first sub-pixels (SP1) arranged in an array, and the dimming cell (2) is provided with a plurality of second sub-pixels (SP2) arranged in an array, each second sub-pixel (SP2) corresponding to one or more first sub-pixels (SP1). The driving method includes: When a first sub-pixel (SP1) in the liquid crystal display cell (1) is in a bright state, a second sub-pixel (SP2) in the dimming cell (2) corresponding to the first sub-pixel (SP1) and a plurality of second sub-pixels (SP2) surrounding the corresponding second sub-pixel (SP2) are simultaneously in a bright state. The plurality of second sub-pixels (SP2) surrounding the corresponding second sub-pixel (SP2) include: a plurality of second sub-pixels (SP2) adjacent to the corresponding second sub-pixel (SP2) along the scan line direction (X) and data line direction (Y) of the dual-cell liquid crystal display panel.
2. The driving method as described in claim 1, characterized in that, The third substrate (13) is a glass substrate, and the thickness of the third substrate (13) is 0.18mm~0.22mm.
3. The driving method as described in claim 2, characterized in that, A scattering layer (24) is provided on the side of the third substrate (13) near the second liquid crystal layer (22), and light-scattering particles (241) are provided in the scattering layer (24).
4. The driving method as described in claim 1, characterized in that, The third substrate (13) is a polyimide substrate, and the thickness of the third substrate (13) is 0.05mm~0.1mm.
5. The driving method as described in claim 4, characterized in that, The third substrate (13) is a high-transmittance polyimide substrate with a transmittance greater than or equal to 98%. A scattering layer (24) is provided on the side of the third substrate (13) near the second liquid crystal layer (22), and light-scattering particles (241) are provided in the scattering layer (24).
6. The driving method as described in claim 4, characterized in that, The third substrate (13) is a polyimide substrate with a certain degree of haze, and the haze of the third substrate (13) is greater than or equal to 40%.
7. The driving method as described in claim 1, characterized in that, The first substrate (11) has a first polarizer (31) on the side away from the first liquid crystal layer (12), and the second substrate (21) has a second polarizer (32) on the side away from the second liquid crystal layer (22). No polarizer is provided between the liquid crystal display cell (1) and the dimming cell (2).
8. The driving method as described in claim 1, characterized in that, The liquid crystal display cell (1) is provided with a first pixel electrode (15) and a first common electrode (16) cooperating with the first pixel electrode (15). The first pixel electrode (15) is disposed on the first substrate (11) on the side close to the first liquid crystal layer (12) or on the third substrate (13) on the side close to the first liquid crystal layer (12). The first common electrode (16) is disposed on the first substrate (11) on the side close to the first liquid crystal layer (12) or on the third substrate (13) on the side close to the first liquid crystal layer (12). The dimming box (2) is provided with a second pixel electrode (25) and a second common electrode (26) that cooperates with the second pixel electrode (25). The second pixel electrode (25) is disposed on the side of the second substrate (21) near the second liquid crystal layer (22) or on the side of the third substrate (13) near the second liquid crystal layer (22). The second common electrode (26) is disposed on the side of the second substrate (21) near the second liquid crystal layer (22) or on the side of the third substrate (13) near the second liquid crystal layer (22).
9. A display device, characterized in that, It includes a dual-cell liquid crystal display panel, which is driven by the driving method as described in any one of claims 1-8.