CN117492283A

CN117492283A - Display panel

Info

Publication number: CN117492283A
Application number: CN202311447110.8A
Authority: CN
Inventors: 李吉; 王国中
Original assignee: TCL China Star Optoelectronics Technology Co Ltd
Current assignee: TCL China Star Optoelectronics Technology Co Ltd
Priority date: 2023-11-01
Filing date: 2023-11-01
Publication date: 2024-02-02

Abstract

The embodiment of the application discloses a display panel which comprises a liquid crystal box, wherein the liquid crystal box comprises a plurality of sub-pixels, the sub-pixels comprise a first sub-pixel and a second sub-pixel which display different colors, and the liquid crystal box comprises a first substrate and a second substrate which are oppositely arranged; the liquid crystal box also comprises cholesteric liquid crystal arranged between the first substrate and the second substrate, wherein the first sub-pixel is in a transmission display mode, and the second sub-pixel is in a reflection display mode. In the application, the brightness of the red sub-pixel can be increased through the transmission display mode, so that the problem that the reflectivity of the red sub-pixel is low in the reflection mode is solved.

Description

Display panel

Technical Field

The application relates to the field of display, in particular to a display panel.

Background

Various types of display panels are widely used in life of people, such as mobile phones, televisions and computer screens, color cholesteric liquid crystal electronic paper (cholesteric liquid crystal display panel) is an emerging display technology at present, the cholesteric liquid crystal display panel adopts a reflective display mode, the technical principle is that cholesteric liquid crystal materials have unique selective reflection characteristics, liquid crystals with different screw pitches are obtained by adjusting the proportion of chiral components of the cholesteric liquid crystal, light with three wavelengths of red, green and blue can be reflected by selecting proper materials, and the three lights are used as three primary colors of additive color mixing to realize full-color display.

However, the inventor found that the cholesteric liquid crystal display panel has a problem that the reflectivity of the red sub-pixel is low, resulting in low brightness of the red picture.

Disclosure of Invention

The embodiment of the application provides a display panel, which can solve the problem that the reflectivity of a red sub-pixel is low, so that the brightness of a red picture is low in a cholesteric liquid crystal display panel.

The embodiment of the application provides a display panel, which comprises a liquid crystal box, wherein the liquid crystal box comprises a plurality of sub-pixels, the sub-pixels comprise a first sub-pixel and a second sub-pixel which display different colors, and the liquid crystal box comprises a first substrate and a second substrate which are oppositely arranged;

the liquid crystal box further comprises cholesteric liquid crystal arranged between the first substrate and the second substrate, the first sub-pixel is in a transmission display mode, and the second sub-pixel is in a reflection display mode.

Optionally, in some embodiments of the present application, a color blocking layer is further included, the color blocking layer including:

the first color resistor is arranged between the first substrate and the second substrate and corresponds to the first sub-pixel.

Optionally, in some embodiments of the present application, the liquid crystal cell further includes a third subpixel, the third subpixel is in a reflective display mode, and the third subpixel displays a color different from both the first subpixel and the second subpixel.

Optionally, in some embodiments of the present application, the color blocking layer further includes:

the second color resistance is arranged corresponding to the second sub-pixel;

and the third color resistance is arranged corresponding to the third sub-pixel.

Optionally, in some embodiments of the present application, the first sub-pixel is a red sub-pixel, the second sub-pixel is one of a green sub-pixel and a blue sub-pixel, and the third sub-pixel is the other of the green sub-pixel and the blue sub-pixel.

Optionally, in some embodiments of the present application, an area of the first subpixel is larger than an area of the second subpixel and an area of the third subpixel on a plane of the display panel.

Optionally, in some embodiments of the present application, the liquid crystal cell further comprises:

the retaining wall is arranged between the adjacent sub-pixels, and an independent space for accommodating the cholesteric liquid crystal is formed by surrounding the corresponding sub-pixels.

Optionally, in some embodiments of the present application, further comprising:

a backlight disposed on a non-display side of the liquid crystal cell;

the display panel further comprises a light blocking layer, wherein the light blocking layer is arranged between the cholesteric liquid crystal in the second sub-pixel and the backlight, and the light blocking layer shields light rays of the backlight from entering the cholesteric liquid crystal in the second sub-pixel; or,

the light blocking layer is arranged between the cholesteric liquid crystal in the second sub-pixel and the third sub-pixel and the backlight, and the light blocking layer blocks light rays of the backlight from entering the cholesteric liquid crystal in the second sub-pixel and the third sub-pixel.

Optionally, in some embodiments of the present application, the first substrate is disposed between the second substrate and the backlight, and the light blocking layer is disposed on a surface of the first substrate close to the backlight, or the light blocking layer is disposed on a surface of the backlight close to the first substrate.

Optionally, in some embodiments of the present application, the light blocking layer is a black glue layer

In an embodiment of the present application, a display panel is provided, including a liquid crystal cell, where the liquid crystal cell includes a plurality of sub-pixels, the plurality of sub-pixels includes a first sub-pixel and a second sub-pixel for displaying different colors, and the liquid crystal cell includes a first substrate and a second substrate disposed opposite to each other; the liquid crystal box also comprises cholesteric liquid crystal arranged between the first substrate and the second substrate, wherein the first sub-pixel is in a transmission display mode, and the second sub-pixel is in a reflection display mode. In the application, in the cholesteric liquid crystal display panel, the first sub-pixel is in a transmission display mode, the second sub-pixel is in a reflection display mode, and when the first sub-pixel is in a red sub-pixel, the brightness of the red sub-pixel can be increased through the transmission display mode, so that the problem that the reflectivity of the red sub-pixel in the reflection mode is lower is solved. Meanwhile, when the first sub-pixel is a sub-pixel with other colors, the problem of low reflectivity of the sub-pixel with the corresponding color can be solved, so that the brightness of the display of the sub-pixel with the corresponding color can be increased. In addition, the second sub-pixel is in a reflective display mode, and a color resistance layer corresponding to the second sub-pixel is not required to be arranged in the cholesteric liquid crystal display panel, so that materials and cost can be saved, the display can be performed by utilizing ambient light, and power consumption can be reduced to save energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a graph showing the relationship between the reflectivity of each color sub-pixel and the wavelength of a cholesteric liquid crystal panel according to the prior art;

fig. 2 is a schematic cross-sectional view of a display panel according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a second exemplary embodiment of a display panel according to the present disclosure;

fig. 4 is a schematic cross-sectional view of a third exemplary embodiment of a display panel according to the present disclosure.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.

There is provided a display panel, including a liquid crystal cell including a plurality of sub-pixels including first and second sub-pixels displaying different colors, the liquid crystal cell including first and second substrates disposed opposite to each other; the liquid crystal box also comprises cholesteric liquid crystal arranged between the first substrate and the second substrate, wherein the first sub-pixel is in a transmission display mode, and the second sub-pixel is in a reflection display mode.

The following will describe in detail. The following description of the embodiments is not intended to limit the preferred embodiments.

Referring to fig. 1, fig. 1 is a schematic diagram showing the relationship between the reflectivity and the wavelength of each color sub-pixel of a cholesteric liquid crystal panel measured by the inventor; in fig. 1, the abscissa indicates wavelength and the ordinate indicates reflectance. The inventors found that the brightness of the red picture is low when each subpixel of the cholesteric liquid crystal panel adopts the reflective display mode, and therefore, as can be seen from fig. 1, the reflectivity of the green subpixel 1018 (or green picture) and the blue subpixel 1019 (or blue picture) is high, the reflectivity of the red subpixel 1017 (or red picture) is low,

referring to fig. 2 to fig. 4, fig. 2 is a schematic cross-sectional structure of a display panel according to an embodiment of the disclosure; fig. 3 is a schematic cross-sectional view of a second exemplary embodiment of a display panel according to the present disclosure; fig. 4 is a schematic cross-sectional view of a third exemplary embodiment of a display panel according to the present disclosure.

The present application provides a display panel 100, the display panel 100 includes a liquid crystal cell 1001, the liquid crystal cell 1001 includes a plurality of sub-pixels 1011, the plurality of sub-pixels 1011 include a first sub-pixel 101 and a second sub-pixel 102 displaying different colors, the liquid crystal cell 1001 includes a first substrate 11 and a second substrate 21 disposed opposite to each other; the liquid crystal cell 1001 further includes cholesteric liquid crystal 30 disposed between the first substrate 11 and the second substrate 21, and the first subpixel 101 is in a transmissive display mode and the second subpixel 102 is in a reflective display mode.

Specifically, as shown in fig. 2, the first subpixel 101 is in a transmissive display mode, and the first subpixel 101 transmits the backlight light 201 emitted from the backlight 60 to display an image.

Specifically, as shown in fig. 2, the second subpixel 102 is in a reflective display mode, and the second subpixel 102 reflects ambient light 202 to display an image.

Specifically, when the input voltage is low, the cholesteric liquid crystal is in a bragg reflection state, also referred to as a plane texture state, referred to as a P-state (steady state). By applying a certain pulse voltage to the cholesteric liquid crystal in the P-state, the alignment direction of the cholesteric liquid crystal molecules is disturbed, forming a similar isotropic state which allows the incident light to penetrate or scatter and no specific light to be reflected, this state being called focal conic state, abbreviated as FC state (steady state); when a high-voltage pulse is input, cholesteric liquid crystal molecules are vertically aligned, there is no birefringence in the horizontal direction, and incident light passes through this state is called a field nematic state (H state for short).

The first subpixel 101 is in a transmissive display mode, and displays an image by using the cholesteric liquid crystal in a nematic field state and transmitting the backlight light 201; the second subpixel 102 is in a reflective display mode and displays an image by reflecting ambient light 202 with the cholesteric liquid crystal in a flat texture state.

In the present embodiment, in the cholesteric liquid crystal display panel 100, the first sub-pixel 101 is in the transmissive display mode, the second sub-pixel 102 is in the reflective display mode, and when the first sub-pixel 101 is in the red sub-pixel, the brightness of the red sub-pixel can be increased to solve the problem of low reflectivity of the red sub-pixel in the reflective mode. Meanwhile, when the first sub-pixel 101 is a sub-pixel of another color, the problem of low reflectivity of the sub-pixel of the corresponding color can be solved, so as to increase the brightness of the display of the sub-pixel of the corresponding color. In addition, the second subpixel 102 is in a reflective display mode, and in the cholesteric liquid crystal 30 display panel 100, a color resistance layer corresponding to the second subpixel 102 is not required, so that materials and cost can be saved, display can be performed by using ambient light, and power consumption can be reduced to save energy.

It should be noted that, the first subpixel 101 in the transmissive mode and the subpixel 102 in the reflective mode can display images without a polarizer, so that the polarizer is prevented from absorbing light, and the brightness of the display panel 100 is greatly improved.

In some embodiments, the display panel 100 further includes a color resist layer 40, the color resist layer 40 includes a first color resist 41, and the first color resist 41 is disposed between the first substrate 11 and the second substrate 21 and corresponds to the first sub-pixel 101.

Specifically, the first sub-pixel 101 is in the transmissive display mode, and does not selectively transmit light of a corresponding wavelength, so the first color resistor 41 needs to be set to display a corresponding color, and the first color resistor 41 is used to enable the first sub-pixel 101 to display the first color.

Specifically, the first color resist 41 is disposed between the first substrate 11 and the second substrate 21, the backlight light 201 passes through the first color resist 41, and the ambient light 202 reflected by the second sub-pixel 102 does not pass through the first color resist 41.

Specifically, fig. 2 illustrates that the first substrate 11 is disposed between the second substrate 21 and the backlight 60, and the color resist layer 40 is disposed on the second substrate 21.

In some embodiments, the liquid crystal cell 1001 further includes a third subpixel 103, the third subpixel 103 is in a reflective display mode, and the third subpixel 103 displays a different color than both the first subpixel 101 and the second subpixel 102.

Specifically, the third subpixel 103 is in a reflective display mode, and the display principle of the third subpixel 103 is the same as that of the second subpixel 102, except that the pitch of the cholesteric liquid crystal in the third subpixel 103 is different from that of the cholesteric liquid crystal in the second subpixel 102.

Further, the pitch of the cholesteric liquid crystal 30 in the first sub-pixel 101 may be set, so that the cholesteric liquid crystal 30 in the first sub-pixel 101 is in a plane texture state and is anti-white, so that the backlight light 201 may be reflected, when the cholesteric liquid crystal 30 in the first sub-pixel 101 is in the plane texture state, the first sub-pixel 101 is in a dark state, and the backlight light 201 is reflected, so that the brightness of the first sub-pixel 101 in the dark state may be reduced, and the contrast ratio may be improved.

Specifically, cholesteric liquid crystals may be disposed in the first, second, and third sub-pixels 101, 102, and 103 by a liquid crystal dropping process (ODF process), and the cholesteric liquid crystals 30 in the first, second, and third sub-pixels 101, 102, and 103 are added with different kinds or/and different amounts of chiral agents, and then are formed with different pitches of the cholesteric liquid crystals 30 in the first, second, and third sub-pixels 101, 102, and 103 by an ultraviolet light irradiation process.

In some embodiments, as shown in fig. 3, the color resist layer 40 further includes a second color resist 42 and a third color resist 43; the second color resistor 42 is disposed corresponding to the second subpixel 102; the third color resist 43 is disposed corresponding to the third subpixel 103.

Specifically, the second color resistor 42 is disposed corresponding to the second sub-pixel 102, and the wavelength of the second color displayed can be further controlled by the ambient light reflected by the second sub-pixel 102 through the second color resistor 42, so as to promote the uniformity of the second color.

Specifically, the third color resistor 43 is disposed corresponding to the third sub-pixel 103, and the wavelength of the third color can be further controlled by the ambient light reflected by the third sub-pixel 103 through the third color resistor 43, so as to improve the uniformity of the third color.

It should be noted that, in some embodiments, as shown in fig. 2, only the first color resist 41 is provided, and the liquid crystal cell 1001 may include a planarization layer 51 for planarizing the level difference caused by the first color resist 41.

It should be noted that, in some embodiments, as shown in fig. 3, the first color resist 41, the second color resist 42, and the third color resist 43 are simultaneously provided, the liquid crystal cell 1001 may include a black matrix 52 (BM), the black matrix 52 includes openings, the first color resist 41, the second color resist 42, and the third color resist 43 are filled in the corresponding openings, and the black matrix 52 and the retaining wall 14 are overlapped in the thickness direction of the display panel 100.

In some embodiments, the first sub-pixel 101 is a red sub-pixel, the second sub-pixel 102 is one of a green sub-pixel and a blue sub-pixel, and the third sub-pixel 103 is the other of the green sub-pixel and the blue sub-pixel.

Specifically, in the existing reflective cholesteric liquid crystal display panel, the reflectivity of the red subpixel is low, the brightness of the red image is low, and the first subpixel 101 is a red subpixel, so that the brightness of the red subpixel or the red image can be improved.

In some embodiments, the area of the first subpixel 101 is greater than the area of the second subpixel 102 and the area of the third subpixel 103 in the plane of the display panel 100.

Specifically, the area of the first subpixel 101 is larger than the area of the second subpixel 102 and the area of the third subpixel 103, so that the brightness of the red subpixel or the red image can be further improved.

In some embodiments, the liquid crystal cell 1001 further includes a retaining wall 14, where the retaining wall 14 is disposed between the adjacent sub-pixels 1011, so that an independent space for accommodating the cholesteric liquid crystal 30 is defined by the corresponding sub-pixels 1011.

Specifically, the retaining wall 14 is disposed to enclose and form a space for accommodating the cholesteric liquid crystal 30, so that the cholesteric liquid crystal 30 in the first sub-pixel 101, the second sub-pixel 102, and the third sub-pixel 103 have different pitches, respectively.

Specifically, by providing the retaining wall 14, the first cholesteric liquid crystal 31 in the first subpixel 101, the second cholesteric liquid crystal 32 in the second subpixel 102, and the third cholesteric liquid crystal 33 in the third subpixel 103 can have different pitches without confusion.

Specifically, the method for manufacturing the retaining wall 14 may be, but not limited to, forming by photolithography.

In some embodiments, the display panel 100 further includes a backlight 60; the backlight 60 is disposed on the non-display side of the liquid crystal cell 1001; the display panel 100 further includes a light blocking layer 70, where the light blocking layer 70 is disposed between the cholesteric liquid crystal 30 in the second subpixel 102 and the backlight 60, and the light blocking layer 70 blocks light of the backlight 60 from entering the cholesteric liquid crystal 30 in the second subpixel 102; alternatively, the light blocking layer 70 is disposed between the cholesteric liquid crystal 30 and the backlight 60 in the second and third sub-pixels 102 and 103, and the light blocking layer 70 blocks light of the backlight 60 from entering the cholesteric liquid crystal 30 in the second and third sub-pixels 102 and 103.

Specifically, the light blocking layer 70 is disposed between the cholesteric liquid crystal 30 in the second sub-pixel 102 or/and the third sub-pixel and the backlight 60, and the light blocking layer 70 blocks light of the backlight 60 from entering the cholesteric liquid crystal 30 of the second sub-pixel 102 or/and the third sub-pixel 103.

Specifically, the non-display side of the liquid crystal cell 1001 refers to the side of the liquid crystal cell 1001 that does not display an image.

Specifically, the display panel 100 further includes a backlight 60, and the backlight 60 provides the displayed light for the first subpixel 101 in the transmissive mode.

Specifically, the light blocking layer 70 blocks light of the backlight 60 from entering the cholesteric liquid crystal 30 of the second and third sub-pixels 102 and 103, and prevents the backlight light 201 from entering the second and third sub-pixels 102 and 103 to interfere with displaying an image of a corresponding color.

In some embodiments, the first substrate 11 is disposed between the second substrate 21 and the backlight 60, and the light blocking layer 70 is disposed on a surface of the first substrate 11 near the backlight 60, or the light blocking layer 70 is disposed on a surface of the backlight 60 near the first substrate 11.

Specifically, as shown in fig. 3, the light blocking layer 70 is disposed on the surface of the first substrate 11 near the backlight 60, and the light blocking layer 70 may block the backlight light 201 from entering the second and third sub-pixels 102 and 103.

Specifically, as shown in fig. 4, the light blocking layer 70 is disposed on a surface of the backlight 60 near the first substrate 11, and the light blocking layer 70 may block the backlight light 201 from entering the second and third sub-pixels 102 and 103.

In some embodiments, the light blocking layer 70 is a black glue layer, and the black glue layer can be implemented by a coating manner, so that the manufacturing process is simple.

As shown in fig. 2, the liquid crystal cell 1001 may further include an array composite film layer 12, a plurality of pixel electrodes 13, and a common electrode 22 disposed between the first substrate 11 and the second substrate 21. The array composite film layer 12 is disposed on the first substrate 11, the plurality of pixel electrodes 13 are disposed on the first substrate 11 and correspond to the corresponding sub-pixels 1011, and the common electrode 22 is disposed on the second substrate 21. The array composite film layer 12 may include a plurality of thin film transistors, and the pixel electrode 13 is electrically connected to the corresponding thin film transistor, so that the cholesteric liquid crystal 30 is actively driven, and a change in an electric field between the pixel electrode 13 and the common electrode 22 may change a state of the cholesteric liquid crystal 30.

The foregoing has described in detail a display panel provided by embodiments of the present application, and specific examples have been set forth herein to illustrate the principles and embodiments of the present application, the above examples being provided only to assist in understanding the methods of the present application and their core ideas; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims

1. A display panel comprising a liquid crystal cell, the liquid crystal cell comprising a plurality of sub-pixels, the plurality of sub-pixels comprising a first sub-pixel and a second sub-pixel displaying different colors, the liquid crystal cell comprising a first substrate and a second substrate disposed opposite to each other;

2. The display panel of claim 1, further comprising a color blocking layer comprising:

3. The display panel of claim 2, wherein the liquid crystal cell further comprises a third subpixel, the third subpixel is in a reflective display mode, and the third subpixel displays a different color than both the first subpixel and the second subpixel.

4. The display panel of claim 3, wherein the color resist layer further comprises:

the second color resistance is arranged corresponding to the second sub-pixel;

5. The display panel of claim 3, wherein the first subpixel is a red subpixel, the second subpixel is one of a green subpixel and a blue subpixel, and the third subpixel is the other of the green subpixel and the blue subpixel.

6. The display panel of claim 5, wherein an area of the first subpixel is greater than an area of the second subpixel and an area of the third subpixel on a plane of the display panel.

7. The display panel of any one of claims 1 to 6, wherein the liquid crystal cell further comprises:

8. The display panel of claim 7, further comprising:

a backlight disposed on a non-display side of the liquid crystal cell;

the display panel further comprises a light blocking layer, wherein the light blocking layer is arranged between the cholesteric liquid crystal in the second sub-pixel and the backlight, and the light blocking layer shields light rays of the backlight from entering the cholesteric liquid crystal in the second sub-pixel; or the light blocking layer is arranged between the cholesteric liquid crystal in the second sub-pixel and the third sub-pixel and the backlight, and the light blocking layer blocks the light of the backlight from entering the cholesteric liquid crystal in the second sub-pixel and the third sub-pixel.

9. The display panel according to claim 8, wherein the first substrate is disposed between the second substrate and the backlight, and the light blocking layer is disposed on a surface of the first substrate close to the backlight, or on a surface of the backlight close to the first substrate.

10. The display panel of claim 9, wherein the light blocking layer is a black glue layer.