Display panel and display device

Abstract

The utility model discloses a display panel and a display device, the display panel comprises a first substrate, a second substrate and a bistable liquid crystal layer, the first substrate and the second substrate are in box alignment, the bistable liquid crystal layer is arranged between the first substrate and the second substrate, and each pixel unit of the display panel comprises at least two sub-pixels; the first substrate is a substrate far away from the light emitting side of the display panel and comprises an ink layer, the ink layer comprises ink parts in one-to-one correspondence with the sub-pixels, and the colors of the ink parts corresponding to the sub-pixels in each pixel unit are different; one of the first substrate and the second substrate comprises a driving circuit layer and pixel electrodes which are driven by the driving circuit layer and are in one-to-one correspondence with the sub-pixels, and the other one of the first substrate and the second substrate comprises a common electrode. According to the embodiment of the utility model, the sub-pixels of the pixel units are set to be in different substrate colors, and the liquid crystal molecules are controlled to be in different steady states through the driving circuit layer, so that multicolor driving is realized according to the bistable liquid crystal.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] Cholesteric liquid crystals exhibit bistable behavior; when an electric field of varying intensity is applied, the helical arrangement of the cholesteric liquid crystal molecules changes, resulting in two states: bright and dark. Cholesteric liquid crystal display products are driven using a passive matrix method, eliminating the need for a backlight and polarizer, and thus offering lower power consumption compared to traditional liquid crystal displays. While cholesteric liquid crystals are typically used in electronic paper applications, they usually only display two colors. Therefore, utilizing the bistable nature of cholesteric liquid crystals to achieve color display has become a crucial technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] To address at least one of the aforementioned problems, a first embodiment of this utility model provides a display panel comprising a plurality of pixel units arranged in an array. The display panel includes a first substrate and a second substrate in a pegboard configuration, and a bistable liquid crystal layer disposed between the first substrate and the second substrate.

[0004] Each pixel unit includes at least two sub-pixels;

[0005] The first substrate is a substrate away from the light-emitting side of the display panel, and includes an ink layer. The ink layer includes ink portions corresponding to each sub-pixel, and the ink portions corresponding to each sub-pixel in each pixel unit are of different colors.

[0006] One of the first substrate and the second substrate includes a driving circuit layer and pixel electrodes driven by the driving circuit layer that correspond one-to-one with the sub-pixels, and the other of the first substrate and the second substrate includes a common electrode.

[0007] For example, in the display panel provided in some embodiments of this application, the first substrate includes a first substrate, a driving circuit layer disposed on the first substrate, and pixel electrodes disposed on the driving circuit layer and spaced apart.

[0008] The second substrate includes a second substrate and a common electrode disposed on the second substrate.

[0009] For example, in some embodiments of the display panel provided in this application, a first gap is included between two adjacent ink portions;

[0010] The first substrate further includes a black matrix disposed on the driving circuit layer, wherein the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacer on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

[0011] For example, in some embodiments of the present application, in a display panel, on a cross section perpendicular to the first substrate, the first substrate includes pixel electrodes and a black matrix stacked sequentially on the first substrate, wherein the black matrix wraps around the end of the pixel electrode near the end of the pixel electrode.

[0012] For example, in some embodiments of the present application, in a display panel, on a cross section perpendicular to the first substrate, the first substrate includes a black matrix and pixel electrodes stacked sequentially on the first substrate, wherein the pixel electrodes wrap around the ends of the black matrix near the ends of the black matrix.

[0013] For example, in some embodiments of the display panel provided in this application, a first gap is included between two adjacent ink portions;

[0014] The second substrate further includes a black matrix disposed on the second substrate. When the first substrate and the second substrate are assembled, the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacer on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

[0015] For example, in some embodiments of the display panel provided in this application, the first substrate includes a first substrate and a common electrode disposed on the first substrate;

[0016] The second substrate includes a second substrate, a driving circuit layer disposed on the second substrate, and pixel electrodes disposed on the driving circuit layer and spaced apart.

[0017] For example, in some embodiments of the display panel provided in this application, a first gap is included between two adjacent ink portions;

[0018] The second substrate further includes a black matrix disposed between the second substrate and the driving circuit layer. When the first substrate and the second substrate are aligned, the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacer on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

[0019] For example, in some embodiments of the display panel provided in this application, a first gap is included between two adjacent ink portions;

[0020] The first substrate further includes a black matrix disposed between the first substrate and the common electrode, wherein the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacing on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

[0021] For example, in some embodiments of the display panel provided in this application, the ink layer is disposed on the side of the first substrate away from the second substrate.

[0022] For example, in some embodiments of the display panel provided in this application, the ink layer is disposed on the side of the first substrate close to the second substrate.

[0023] For example, in the display panel provided in some embodiments of this application, the bistable liquid crystal layer includes a plurality of mutually enclosed liquid crystal regions, and the bistable liquid crystal molecules in at least two of the plurality of liquid crystal regions are of different colors.

[0024] The second embodiment of this utility model provides a display device, including a display panel as described in the first embodiment.

[0025] The beneficial effects of this utility model are as follows:

[0026] This invention addresses existing problems by providing a display panel, display device, usage method, and manufacturing method. One embodiment of the display panel sets the ink portion corresponding to each sub-pixel of each pixel unit of the display panel to different base colors. It then controls the electric field applied to the liquid crystal molecules corresponding to each sub-pixel to control the liquid crystal molecules to be in different stable states. This results in the emitted light of each sub-pixel being the superposition of the base color and the liquid crystal color reflected from external incident light. Furthermore, the emitted light of each pixel unit is the superposition of the emitted light from each sub-pixel. In other words, this embodiment achieves color control by dividing each sub-pixel of each pixel unit, thereby realizing multi-color driving of a single-layer liquid crystal cell in a reflective display panel based on bistable liquid crystals. This effectively overcomes the problems existing in related technologies and has broad application prospects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1a and 1bA schematic diagram showing the stable state of cholesteric liquid crystal molecules reflecting incident light;

[0029] Figure 2 This diagram illustrates the structure of a display panel according to one embodiment of the present invention.

[0030] Figures 3a-3d This diagram illustrates the application of the display panel according to one embodiment of the present invention.

[0031] Figures 4a-4b This diagram shows a schematic representation of the layer structure of the first substrate according to an embodiment of the present invention.

[0032] Figure 5 This diagram illustrates the structure of a display panel according to another embodiment of the present invention.

[0033] Figure 6 This diagram illustrates the structure of a display panel according to another embodiment of the present invention.

[0034] Figure 7 This diagram illustrates the layer structure of the second substrate according to an embodiment of the present invention.

[0035] Figures 8a-8c This diagram illustrates the structure of a pixel unit according to an embodiment of the present invention.

[0036] Figure 9 A flowchart illustrating the usage method of one embodiment of this utility model is shown;

[0037] Figure 10 A flowchart illustrating the manufacturing method of one embodiment of this utility model is shown. Detailed Implementation

[0038] To more clearly illustrate this utility model, the preferred embodiments and accompanying drawings will be used for further description. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of this utility model.

[0039] It should be noted that the terms "on," "formed on," and "set on" used in this document can indicate that one layer is directly formed or set on another layer, or that one layer is indirectly formed or set on another layer, meaning that there are other layers between the two layers. In this document, unless otherwise stated, the term "located on the same layer" means that two layers, components, elements, or parts can be formed through the same patterning process, and that these two layers, components, elements, or parts are generally formed of the same material. In this document, unless otherwise stated, the description of "patterning process" generally includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping. The description of "one-time patterning process" refers to a process that uses a single photomask to form patterned layers, components, elements, etc.

[0040] Cholesteric liquid crystal (CLC) exhibits bistable display characteristics and is typically used in reflective display panels. Based on its display properties, CLC utilizes ambient light to reflect and display images, eliminating the need for a backlight and resulting in low power consumption. Specifically, CLC possesses three states: P-state (Planar Texture), FC-state (FocalConic Texture), and H-state (Hometropic Texture). The P-state and FC-state are stable states, requiring no voltage to maintain their position and remaining stable with a fixed image in the absence of an external electric field. The H-state, however, is unstable, exhibiting a transitional state under voltage and displaying an irregular image. In other words, under the influence of an external electric field, CLC can switch between its two stable states, demonstrating bistable characteristics. Because the texture of the two stable states used in the display is stable in the absence of an external electric field, it is not necessary to maintain the display state with a prolonged external electric field. Therefore, CLC display products are characterized by low power consumption.

[0041] Specifically, cholesteric liquid crystal molecules are arranged in a helical pattern. The helical structure of cholesteric liquid crystal molecules is described using the pitch, which indicates the tightness of the helical arrangement. For example, when the electric field changes, altering the steady state of the cholesteric liquid crystal molecules, such as changing from the P state to the FC state, the pitch of the cholesteric liquid crystal molecules also changes accordingly. Figure 1a The diagram shows the reflection of cholesteric liquid crystal molecules in the P-state. Incident light L1, matching the pitch P, is reflected as circularly polarized light. Simultaneously, the transmitted light L3 of incident light L1 is reflected by the background color of the liquid crystal layer, forming background-reflected light. Therefore, the reflected light L2 of the liquid crystal layer when the cholesteric liquid crystal molecules are in the P-state is a superposition of circularly polarized light and background-reflected light. Figure 1bThe diagram shows the reflection of cholesteric liquid crystal molecules in the FC state. The pitch distribution of cholesteric liquid crystal molecules in the FC state is disordered. The incident light L1 is scattered by the liquid crystal molecules. At this time, the reflected light L4 of the liquid crystal layer appears as the background color reflected light.

[0042] In related technologies, based on bistable cholesteric liquid crystal display technology, due to the pitch requirements of cholesteric liquid crystal molecules, a single-cell architecture can only achieve monochrome, black-and-white, or two-color displays. To address the longer display duration requirements, one related technology uses a three-layer liquid crystal cell architecture. However, this architecture suffers from issues such as a thicker overall display product and inconsistent specifications; furthermore, it leads to complex manufacturing processes and high costs; and in practical use, this architecture has been found to have poor stability.

[0043] In response to the above situation, such as Figure 2 As shown, one embodiment of the present invention provides a display panel including a plurality of pixel units arranged in an array. The display panel includes a first substrate 10 and a second substrate 20 in a peg array, and a bistable liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20.

[0044] Each pixel unit includes at least two sub-pixels;

[0045] The first substrate 10 is a substrate away from the light-emitting side of the display panel, and includes an ink layer. The ink layer includes ink portions corresponding to each sub-pixel, and the ink portions corresponding to each sub-pixel in each pixel unit are of different colors.

[0046] One of the first substrate and the second substrate includes a driving circuit layer and pixel electrodes driven by the driving circuit layer that correspond one-to-one with the sub-pixels, and the other of the first substrate and the second substrate includes a common electrode.

[0047] In this embodiment, by setting the ink portion corresponding to each sub-pixel of each pixel unit of the display panel to different base colors, and then controlling the electric field applied to the liquid crystal molecules corresponding to each sub-pixel to control the liquid crystal molecules to be in different stable states, the emitted light of each sub-pixel is a superposition of the base color and the liquid crystal color reflected external incident light, thereby making the emitted light of each pixel unit a superposition of the emitted light of each sub-pixel. That is, this embodiment achieves color controllability by dividing each sub-pixel of each pixel unit, thereby realizing multi-color driving of a single-layer liquid crystal cell of a reflective display panel based on bistable liquid crystal. Specifically, as shown... Figure 2The image shows a pixel unit in this embodiment, including two sub-pixels U1 and U2. The base color of the ink portion 121 of sub-pixel U1 is black, and the base color of the ink portion 122 of sub-pixel U2 is cyan. The bistable liquid crystal is a cholesteric liquid crystal. In this embodiment, the cholesteric liquid crystal is red. The cholesteric liquid crystals of sub-pixels U1 and U2 are both in the FC state, that is, the cholesteric liquid crystal is in a disordered pitch distribution. The incident light is scattered by the liquid crystal molecules, and the reflected light of the liquid crystal layer is the background color reflected light reflected by the base color. That is, the emitted light C1 of sub-pixel U1 is black, the emitted light C2 of sub-pixel U2 is cyan, and the emitted light C3 of the pixel unit is cyan.

[0048] It should be noted that this embodiment is only used to illustrate the specific implementation of this application, and this application does not specifically limit the number of sub-pixels included in each pixel unit, such as... Figures 8a-8c As shown, there can be two, three, or more.

[0049] Specifically, such as Figure 8a As shown, each pixel unit includes two parallel sub-pixels U1 and U2. The driving circuit X is located on one side of the sub-pixel and transmits control signals to the sub-pixel through, for example, gate signal lines and source signal lines.

[0050] Similarly, such as Figure 8b As shown, each pixel unit includes three parallel sub-pixels U1, U2 and U3. The driving circuit X is located on one side of the sub-pixel and transmits control signals to the sub-pixel through, for example, gate signal lines and source signal lines.

[0051] Similarly, such as Figure 8c As shown, each pixel unit includes four sub-pixels U1, U2, U3 and U4 arranged in an array. The driving circuit X is located on one side of the sub-pixel and transmits control signals to the sub-pixel through, for example, gate signal lines and source signal lines.

[0052] As shown in Table 1, when a pixel unit includes two sub-pixels, the superimposed color is formed by the color of the cholesteric liquid crystal molecules, the base color of the ink portion, and the P-state or FC-state of the liquid crystal molecules.

[0053] As shown in Table 2, when a pixel unit includes multiple sub-pixels, the superimposed color is formed by the color of the cholesteric liquid crystal molecules, the base color of the ink portion, and the P-state or FC-state of the liquid crystal molecules.

[0054] Those skilled in the art should understand that the more sub-pixels each pixel unit contains, the more superimposed colors can be formed, and the richer the color display will be.

[0055] Table 1. Color combination schemes for a pixel unit including two sub-pixels.

[0056]

[0057] Table 2 Color combination schemes for pixel units including multiple sub-pixels

[0058]

[0059] In an optional embodiment, such as Figure 2 As shown, the first substrate 10 includes a first substrate 11, a driving circuit layer 14 disposed on the first substrate 11, and pixel electrodes 15 disposed on the driving circuit layer 14 and spaced apart.

[0060] The second substrate 20 includes a second substrate 21 and a common electrode 22 disposed on the second substrate 21.

[0061] In this embodiment, the driving circuit layer 14 drives the pixel electrode 15, and controls the steady state of the cholesteric liquid crystal molecules based on the electric field formed by the voltage applied to the pixel electrode 15 and the voltage applied to the common electrode 22, such as... Figure 2 As shown, the cholesteric liquid crystals of sub-pixels U1 and U2 of this pixel unit are both in the FC state, that is, the voltage applied to the pixel electrode 15 is the same, forming the same electric field with the common electrode, thereby making the cholesteric liquid crystal molecules of the two sub-pixels in the FC state. The emitted light C1 of sub-pixel U1 is the reflected light of the incident light at the base color of the ink section 121, and the emitted light C2 of sub-pixel U2 is the reflected light of the incident light at the base color of the ink section 122. The emitted light C3 of the pixel unit is the superposition of the emitted light C1 and C2 of sub-pixels U1 and U2.

[0062] To further improve the display effect of the display panel, in an optional embodiment, such as Figure 2 As shown, there is a first gap between two adjacent ink sections (not shown in the figure);

[0063] The first substrate 10 includes a black matrix 13 disposed on the driving circuit layer. The orthographic projection of the black matrix 13 on the first substrate 11 at least partially overlaps with the orthographic projection of the first spaced space on the first substrate. The orthographic projection of the black matrix 13 on the first substrate 11 does not overlap with the orthographic projection of the ink portions 121 and 122 on the first substrate 11.

[0064] In this embodiment, the black matrix 13 disposed on the first substrate effectively prevents color crosstalk between adjacent sub-pixels, thereby improving the display effect of the display panel. When the black matrix is ​​disposed on the side of the driving circuit layer 14 away from the substrate 11, the ink part is located in the opening area formed by the black matrix. The orthographic projection of the driving circuit of the driving circuit layer on the first substrate and the orthographic projection of the black matrix on the first substrate at least partially overlap. The black matrix effectively prevents the reflection problem of the metal film layer in the driving circuit. At the same time, the black matrix can also block the channel of the driving circuit, effectively improving the display effect of the display panel.

[0065] Specifically, such as Figure 3a As shown, the first substrate 10 includes a first substrate 11, a driving circuit layer 14, a black matrix 13, ink portions 121 and 122 located in the opening area formed by the black matrix 13, and a pixel electrode 15 stacked on the first substrate 11. The second substrate 20 includes a second substrate 21 and a common electrode 22 disposed on the second substrate 21. The cholesteric liquid crystal molecules in the bistable liquid crystal layer are red, the base color of the ink portion of the sub-pixel U1 of the pixel unit is black, and the base color of the ink portion of the sub-pixel U2 of the pixel unit is cyan. The driving circuit layer 14 drives the pixel electrode 15, and the electric field formed by the voltage applied to the pixel electrode 15 and the voltage applied to the common electrode 22 controls the stable state of the cholesteric liquid crystal molecules. The liquid crystal molecules of the sub-pixel U1 of the pixel unit are in the P state, and the liquid crystal molecules of the sub-pixel U2 are in the FC state. The emitted light C1 of the sub-pixel U1 is the incident light reflected from the liquid crystal molecules and the light reflected from the ink portion 121. The light emitted by sub-pixel U1 is the superimposed light of the base color reflected by the red liquid crystal molecules and the black reflected light of the black base (i.e., no display), which is red light. Similarly, the light emitted by sub-pixel U2 is the reflected light of the incident light in the ink section 122, which is the cyan reflected light of the cyan base. The light emitted by the pixel unit is the superimposed light of the red light of sub-pixel U1's light C1 and the cyan light of sub-pixel U2's light C2, which is white light.

[0066] Specifically, such as Figure 3bAs shown, the first substrate 10 includes a first substrate 11, a driving circuit layer 14, a black matrix 13, ink portions 121 and 122 located in the opening area formed by the black matrix 13, and a pixel electrode 15 stacked on the first substrate 11. The second substrate 20 includes a second substrate 21 and a common electrode 22 disposed on the second substrate 21. In this bistable liquid crystal layer, the cholesteric liquid crystal molecules are red, the base color of the ink portion of sub-pixel U1 in the pixel unit is black, and the base color of the ink portion of sub-pixel U2 in the pixel unit is cyan. The driving circuit layer 14 drives the pixel electrode 15, and the electric field formed by the voltage applied to the pixel electrode 15 and the voltage applied to the common electrode 22 controls the stable state of the cholesteric liquid crystal molecules. The liquid crystal molecules of sub-pixel U1 and sub-pixel U2 in the pixel unit are both in the FC state. The emitted light C1 of sub-pixel U1 is the reflected light of the incident light at the base color of the ink portion 121 (i.e., no display). Similarly, the emitted light C2 of sub-pixel U2 is the reflected light of the incident light at the base color of the ink portion 122, i.e., cyan reflected light. The emitted light C3 of the pixel unit is the superposition light of the emitted light C1 of sub-pixel U1 and the emitted light C2 of sub-pixel U2, i.e., the emitted light C3 of the pixel unit is cyan light.

[0067] Specifically, such as Figure 3c As shown, the structures of the first substrate and the second substrate and the arrangement of the bistable liquid crystal layer are the same as before and will not be described again. The driving circuit layer 14 drives the pixel electrode 15. The electric field formed by the voltage applied to the pixel electrode 15 and the voltage applied to the common electrode 22 controls the stable state of the cholesteric liquid crystal molecules. The sub-pixel U1 of the pixel unit is in the FC state, and the liquid crystal molecules of the sub-pixel U2 are in the P state. The emitted light C1 of the sub-pixel U1 is the reflected light of the incident light at the base color of the ink section 121 (i.e., no display). Similarly, the emitted light C2 of the sub-pixel U2 is the superimposed light of the incident light reflected at the liquid crystal molecules and the reflected light of the base color of the ink section 122. That is, the emitted light C2 of the sub-pixel U2 is the superimposed light of the red reflected light of the red liquid crystal molecules and the cyan reflected light of the cyan base, which is white light. The emitted light C3 of the pixel unit is the superimposed light of the emitted light C1 of the sub-pixel U1 and the emitted light C2 of the sub-pixel U2, which is white light. That is, the emitted light C3 of the pixel unit is white light.

[0068] Specifically, such as Figure 3dAs shown, the structures of the first and second substrates and the arrangement of the bistable liquid crystal layer are the same as before and will not be described again. The driving circuit layer 14 drives the pixel electrode 15. The electric field formed by the voltage applied to the pixel electrode 15 and the voltage applied to the common electrode 22 controls the stable state of the cholesteric liquid crystal molecules. The liquid crystal molecules of sub-pixel U1 and sub-pixel U2 of the pixel unit are both in the P state. The emitted light C1 of sub-pixel U1 is the superposition of the incident light reflected by the liquid crystal molecules and the light reflected by the base color of the ink part 121. That is, the emitted light C1 of sub-pixel U1 includes red liquid crystal molecules. The superposition of the red reflected light and the black reflected light of the black substrate (i.e., no display) is red light; similarly, the emitted light C2 of sub-pixel U2 is the reflected light of the incident light on the liquid crystal molecules and the reflected light of the base color of the ink section 122, that is, the emitted light C2 of sub-pixel U2 is the superposition of the red reflected light of the red liquid crystal molecules and the cyan reflected light of the cyan substrate, which is white light; the emitted light C3 of the pixel unit is the superposition of the red light of the emitted light C1 of sub-pixel U1 and the white light of the emitted light C2 of sub-pixel U2, that is, the emitted light C3 of the pixel unit is red light.

[0069] In the above embodiments, the liquid crystal molecules of the bistable liquid crystal layer are of the same color, each pixel unit is configured to include two sub-pixels, and the ink part of each sub-pixel corresponds to a different base color. By applying different voltages to the pixel electrodes through the driving circuit layer and forming different electric fields with the common electrode, three different colors of output can be formed, such as white, cyan and red, so that the display panel can control the sub-pixels of each pixel unit to form color output according to different display content.

[0070] In an optional embodiment, such as Figure 4a As shown, in a cross section perpendicular to the first substrate, the first substrate 10 includes a pixel electrode 15 and a black matrix 13 stacked sequentially on the first substrate 11, wherein the black matrix 13 wraps around the end of the pixel electrode 15 near the end of the pixel electrode 15.

[0071] In this embodiment, the first substrate 10 includes a first substrate 11, an ink portion 121 and a gate 141 disposed on the first substrate 11, wherein the orthographic projection of the ink portion 121 on the first substrate 11 and the orthographic projection of the gate 141 on the first substrate 11 do not overlap, a gate insulating layer 142 covering the ink portion 121 and the gate 141, an active layer 143, a source 144 and a drain 145 disposed on the gate insulating layer, wherein the orthographic projection of the active layer 143 on the first substrate 11 falls into the orthographic projection of the gate 141 on the first substrate 11, one end of the source 144 partially covers the active layer 143, one end of the drain 145 partially covers the active layer 143, and the source 144 on the first substrate 10 is partially covered by the active layer 143. The orthographic projection of the gate electrode 145 on the first substrate 11 does not overlap with the orthographic projection of the drain electrode 145 on the first substrate 11. An interlayer insulating layer 146 covers the active layer 143, the source electrode 144, and the drain electrode 145. A pixel electrode 15 is disposed on the interlayer insulating layer 146 and connected to the drain electrode 145 through a via penetrating the interlayer insulating layer 146. A black matrix 13 is disposed on the interlayer insulating layer 146 and partially covers the pixel electrode 15. The orthographic projection of the black matrix 13 on the first substrate 11 does not overlap with the orthographic projection of the ink portion 121 on the first substrate 11, and the end of the black matrix 13 near the ink portion 121 wraps around the end of the pixel electrode 15 near the gate electrode 141. In other words, during the fabrication of the first substrate, the pixel electrode 15 disposed on the interlayer insulating layer 146 is formed first, and then the black matrix 13 disposed on the interlayer insulating layer 146 is formed. The first substrate structure in this embodiment, by setting a black matrix 13, on the one hand, prevents cross-color between two adjacent sub-pixels from affecting the display effect of the display panel, and on the other hand, by setting a black matrix 13, effectively covers the gate, source and drain to prevent the metal film layer of the driving circuit from reflecting light, while blocking the active layer channel of the driving circuit, further improving the display effect of the display panel.

[0072] In another alternative embodiment, such as Figure 4b As shown, in a cross section perpendicular to the first substrate, the first substrate 10 includes a black matrix 13 and a pixel electrode 15 sequentially stacked on the first substrate 11, wherein the pixel electrode 15 wraps around the end of the black matrix 13 near the end of the black matrix 13.

[0073] In this embodiment, the first substrate 10 includes a first substrate 11, an ink portion 121 and a gate 141 disposed on the first substrate 11, wherein the orthographic projection of the ink portion 121 on the first substrate 11 and the orthographic projection of the gate 141 on the first substrate 11 do not overlap, a gate insulating layer 142 covering the ink portion 121 and the gate 141, an active layer 143, a source 144 and a drain 145 disposed on the gate insulating layer, wherein the orthographic projection of the active layer 143 on the first substrate 11 falls into the orthographic projection of the gate 141 on the first substrate 11, one end of the source 144 partially covers the active layer 143, one end of the drain 145 partially covers the active layer 143, and the source 144 is located on the first substrate 11. The orthographic projection on substrate 11 and the orthographic projection on drain 145 on the first substrate 11 do not overlap. An interlayer insulating layer 146 covers the active layer 143, source 144, and drain 145. A black matrix 13 is disposed on the interlayer insulating layer 146. A pixel electrode 15 is disposed on the interlayer insulating layer 146 and partially covers the black matrix 13. The orthographic projection of the black matrix 13 on the first substrate 11 and the orthographic projection of the ink portion 121 on the first substrate 11 do not overlap. The pixel electrode 15 is connected to the drain 145 through a via penetrating the interlayer insulating layer 146, and the end of the pixel electrode 15 near the gate 141 wraps around the end of the black matrix 13 near the ink portion 121. In other words, during the fabrication of the first substrate, the black matrix 13 disposed on the interlayer insulating layer 146 is formed first, and then the pixel electrode 15 disposed on the interlayer insulating layer 146 is formed. The first substrate structure in this embodiment, by setting a black matrix 13, on the one hand, prevents cross-color between two adjacent sub-pixels from affecting the display effect of the display panel, and on the other hand, by setting a black matrix 13, effectively covers the gate, source and drain to prevent the metal film layer of the driving circuit from reflecting light, while blocking the active layer channel of the driving circuit, further improving the display effect of the display panel.

[0074] In an optional embodiment, such as Figure 5 As shown, a first interval 123 is included between two adjacent ink portions 121 and 122; the second substrate 20 also includes a black matrix 23 disposed on the second substrate 21. When the first substrate 10 and the second substrate 20 are aligned, the orthographic projection of the black matrix 23 on the first substrate 11 at least partially overlaps with the orthographic projection of the first interval 123 on the first substrate 11, and the orthographic projection of the black matrix 23 on the first substrate 11 does not overlap with the orthographic projection of the ink portions 121 and 122 on the first substrate 11.

[0075] In this embodiment, the first substrate 10 includes a first substrate 11, a driving circuit layer 14, an ink layer 12 (including ink portions 121 and 122) and a pixel electrode 15 stacked on the first substrate 11. The second substrate 20 includes a second substrate 21, a common electrode 22 disposed on the second substrate 21 and a black matrix 23 disposed on the common electrode. In this embodiment, by disposing the black matrix 23 on the second substrate, color cross-contamination between two adjacent sub-pixels is effectively prevented, thereby improving the display effect of the display panel.

[0076] In an optional embodiment, such as Figure 6 As shown, the first substrate 10 includes a first substrate 11 and a common electrode 16 disposed on the first substrate 11;

[0077] The second substrate 20 includes a second substrate 21, a driving circuit layer 24 disposed on the second substrate 21, and pixel electrodes 25 disposed on the driving circuit layer 24 and spaced apart.

[0078] In this embodiment, the first substrate 10 includes a first substrate 11, an ink layer 12 (including ink portions 121 and 122) stacked on the first substrate 11, and a common electrode 16. The second substrate 20 includes a second substrate 21, a driving circuit layer 24 disposed on the second substrate 21, and a pixel electrode 25 disposed on the driving circuit layer 24. In this embodiment, by disposing the driving circuit layer 24 and the pixel electrode 25 on the upper substrate near the light-emitting side of the display panel, the voltage applied to the pixel electrode is controlled by the driving circuit of the driving circuit layer, thereby controlling the electric field applied to the liquid crystal molecules of each sub-pixel, so as to control the color of the emitted light of the sub-pixel of each pixel unit, forming a color display based on bistable liquid crystal.

[0079] To further improve the display effect of the display panel, in an optional embodiment, such as Figure 6 As shown, a first interval 123 is included between two adjacent ink portions 121 and 122; the second substrate 20 also includes a black matrix 23 disposed between the second substrate 21 and the driving circuit layer 24. When the first substrate 10 and the second substrate 20 are aligned, the orthographic projection of the black matrix 23 on the first substrate 11 at least partially overlaps with the orthographic projection of the first interval 123 on the first substrate 11, and the orthographic projection of the black matrix 23 on the first substrate 11 does not overlap with the orthographic projection of the ink portions 121 and 122 on the first substrate 11.

[0080] In this embodiment, the second substrate 20 provides a black matrix 23 on the side of the driving circuit layer 24 near the second substrate 21. This prevents cross-coloring between two adjacent sub-pixels from affecting the display effect of the display panel. On the other hand, the black matrix 23 effectively covers the driving circuit of the driving circuit layer, preventing the metal film layer of the driving circuit from reflecting incident light and affecting the display effect of the display panel.

[0081] Specifically, such as Figure 7 As shown, the second substrate 20 includes a second substrate 21, a black matrix 23 and a gate 241 disposed on the second substrate 21, a gate insulating layer 242 covering the gate 241, an active layer 243, a source 244 and a drain 245 disposed on the gate insulating layer, the orthographic projection of the active layer 243 on the second substrate 21 falls into the orthographic projection of the gate 241 on the second substrate 21, one end of the source 244 is covered by the active layer 243, one end of the drain 245 is covered by the active layer 243, the orthographic projections of the source 244 and the drain 245 on the second substrate 21 do not overlap, an interlayer insulating layer 246 covering the active layer 243, the source 244 and the drain 245, and a pixel electrode 25 disposed on the interlayer insulating layer 246, the pixel electrode 25 being connected to the drain 245 through a via penetrating the interlayer insulating layer 246. In this embodiment, the second substrate is provided with a black matrix 23. On the one hand, it prevents cross-color between two adjacent sub-pixels from affecting the display effect of the display panel. On the other hand, the black matrix 23 effectively covers the gate, source and drain to prevent the metal film layer of the driving circuit from reflecting light, while blocking the active layer channel of the driving circuit, thereby further improving the display effect of the display panel.

[0082] In an optional embodiment, a first gap is included between two adjacent ink portions; the first substrate further includes a black matrix disposed between the first substrate and the common electrode, wherein the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first gap on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

[0083] In this embodiment, the first substrate includes a first substrate, a black matrix stacked on the first substrate, an ink portion located in the opening area formed by the black matrix, and a common electrode. The second substrate includes a second substrate, a driving circuit layer disposed on the second substrate, and a pixel electrode disposed on the driving circuit layer. In this embodiment, by disposing the black matrix on the first substrate, cross-coloring between two adjacent sub-pixels is effectively prevented, thereby improving the display effect of the display panel.

[0084] In an optional embodiment, the ink layer of the display panel is on the side of the first substrate away from the second substrate.

[0085] In this embodiment, the ink layer is disposed on the outside of the first substrate using the existing electronic paper manufacturing process. For example, printing technology is used to directly print the base color on the side of the first substrate away from the second substrate. That is, mature manufacturing process is used to form the ink part corresponding to each sub-pixel on the side of the first substrate away from the light-emitting side, resulting in low manufacturing cost.

[0086] In another alternative embodiment, the ink layer of the display panel is disposed on the side of the first substrate close to the second substrate.

[0087] In this embodiment, for example, photolithography or inkjet printing technology is used to print the base color on the side of the first substrate close to the second substrate, without considering the transmittance of the first substrate, thereby further improving the display effect of the display panel.

[0088] To achieve richer colors, in an optional embodiment, the bistable liquid crystal layer includes a plurality of mutually enclosed liquid crystal regions, wherein the bistable liquid crystal molecules in at least two of the plurality of liquid crystal regions are of different colors.

[0089] In this embodiment, considering that cholesteric liquid crystals include a variety of colors, such as red, cyan, and yellow, in order to achieve more colors, the bistable liquid crystal layer is partitioned, for example, into multiple closed liquid crystal regions. Different colored cholesteric liquid crystal molecules are injected into each liquid crystal region, thereby realizing the color display of the display panel, further increasing the color combination and improving the display effect.

[0090] Based on the aforementioned display panel, one embodiment of this application also provides a display device including the aforementioned display panel. The display device can be any product or component with display functionality, such as electronic paper, smartphone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator; this embodiment does not limit its scope.

[0091] The display device of this embodiment sets the ink portion corresponding to each sub-pixel of each pixel unit of the display panel to different base colors, and then controls the electric field loaded on the liquid crystal molecules corresponding to each sub-pixel to control the liquid crystal molecules to be in different stable states, so that the emitted light of each sub-pixel is the superposition color of the base color and the liquid crystal color reflected external incident light, thereby making the emitted light of each pixel unit the superposition color of the emitted light of each sub-pixel. That is, this embodiment achieves color controllability by dividing each sub-pixel of each pixel unit, thereby realizing multi-color driving of a single-layer liquid crystal cell of a reflective display device based on bistable liquid crystal.

[0092] This invention addresses existing problems by providing a display panel and display device. One embodiment of the display panel sets the ink portion corresponding to each sub-pixel of each pixel unit of the display panel to different base colors, and then controls the electric field applied to the liquid crystal molecules corresponding to each sub-pixel to control the liquid crystal molecules to be in different stable states. This makes the emitted light of each sub-pixel a superposition of the base color and the liquid crystal color reflected external incident light, thereby making the emitted light of each pixel unit a superposition of the emitted light of each sub-pixel. In other words, this embodiment achieves color control by dividing each sub-pixel of each pixel unit, thereby realizing multi-color driving of a single-layer liquid crystal cell of a reflective display panel based on bistable liquid crystal, effectively overcoming the problems existing in related technologies, and has broad application prospects.

[0093] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A display panel comprising a plurality of pixel units arranged in an array, characterized in that, The display panel includes a first substrate and a second substrate in a cell, and a bistable liquid crystal layer disposed between the first substrate and the second substrate, wherein Each pixel unit includes at least two sub-pixels; The first substrate is a substrate away from the light-emitting side of the display panel, and includes an ink layer. The ink layer includes ink portions corresponding to each sub-pixel, and the ink portions corresponding to each sub-pixel in each pixel unit are of different colors. One of the first substrate and the second substrate includes a driving circuit layer and pixel electrodes driven by the driving circuit layer that correspond one-to-one with the sub-pixels, and the other of the first substrate and the second substrate includes a common electrode.

2. The display panel according to claim 1, characterized in that, The first substrate includes a first substrate, a driving circuit layer disposed on the first substrate, and pixel electrodes disposed on the driving circuit layer and spaced apart. The second substrate includes a second substrate and a common electrode disposed on the second substrate.

3. The display panel according to claim 2, characterized in that, A first gap is included between two adjacent ink sections; The first substrate further includes a black matrix disposed on the driving circuit layer, wherein the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacer on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

4. The display panel according to claim 3, characterized in that, In a cross section perpendicular to the first substrate, the first substrate includes a pixel electrode and a black matrix stacked sequentially on the first substrate, wherein the black matrix wraps around the end of the pixel electrode near the end of the pixel electrode. or In a cross section perpendicular to the first substrate, the first substrate includes a black matrix and pixel electrodes stacked sequentially on the first substrate, wherein the pixel electrodes wrap around the ends of the black matrix near the ends of the black matrix.

5. The display panel according to claim 2, characterized in that, A first gap is included between two adjacent ink sections; The second substrate further includes a black matrix disposed on the second substrate. When the first substrate and the second substrate are assembled, the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacer on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

6. The display panel according to claim 1, characterized in that, The first substrate includes a first substrate and a common electrode disposed on the first substrate; The second substrate includes a second substrate, a driving circuit layer disposed on the second substrate, and pixel electrodes disposed on the driving circuit layer and spaced apart.

7. The display panel according to claim 6, characterized in that, A first gap is included between two adjacent ink sections; The second substrate further includes a black matrix disposed on the second substrate. When the first substrate and the second substrate are assembled, the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacer on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

8. The display panel according to claim 6, characterized in that, A first gap is included between two adjacent ink sections; The first substrate further includes a black matrix disposed between the first substrate and the common electrode, wherein the orthographic projection of the black matrix on the first substrate at least partially overlaps with the orthographic projection of the first spacing on the first substrate, and the orthographic projection of the black matrix on the first substrate does not overlap with the orthographic projection of the ink portion on the first substrate.

9. The display panel according to any one of claims 1-8, characterized in that, The ink layer is disposed on the side of the first substrate away from the second substrate; or The ink layer is disposed on the side of the first substrate near the second substrate.

10. The display panel according to claim 1, characterized in that, The bistable liquid crystal layer includes multiple mutually enclosed liquid crystal regions, and the bistable liquid crystal molecules in at least two of the multiple liquid crystal regions have different colors.

11. A display device, characterized in that, Includes the display panel as described in any one of claims 1-10.

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