Display panel and display device

Abstract

The application relates to a display panel and a display device. The display panel comprises a first substrate and a plurality of pixel units arranged in an array on the first substrate, wherein the pixel units are in a light-transmitting state when not powered, the display panel further comprises a second substrate and a reflective color developing device, the second substrate is located on the side of the first substrate away from the pixel units, the reflective color developing device is arranged between the first substrate and the second substrate, and at least one pixel unit is provided with one reflective color developing device; the reflective color developing device comprises a curved mirror surface and a containing cavity, the containing cavity is configured to display black or white by adjusting a color proportion under a preset condition, a display area of the containing cavity is arranged on the side close to the curved mirror surface, is used for transmitting color-developing light of the containing cavity to a reflecting surface of the curved mirror surface, the containing cavity is located at a focal point position of the curved mirror surface, and the color-developing light of the containing cavity is transmitted to an external environment through the at least one pixel unit through the reflecting effect of the curved mirror surface.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] OLED technology offers advantages such as a wide color gamut, thinness, and fast response time, and is currently used in all high-end mobile phone displays. However, this technology uses PWM dimming to control brightness, which can be harmful to the eyes over time. Furthermore, the lifespan of organic light-emitting materials is currently shorter than that of LCDs, leading to color shifts and screen burn-in over time.

[0003] Specifically, some OLED screens use PWM (pulse width modulation) dimming technology to achieve varying brightness levels. At low brightness levels, PWM dimming can cause noticeable flickering on the screen. Prolonged focus on a flickering screen can cause visual fatigue, dry eyes, headaches, and other discomfort, potentially negatively impacting the visual system over time.

[0004] In order to alleviate the above-mentioned flicker problem, reflective pixels are generally added to the OLED screen. In normal display mode, the OLED layer works and presents images and content by emitting its own light. When switched to reading mode, the OLED pixels stop emitting light, and the reflective pixels on the lower layer take over the display task. The reflective pixels themselves do not actively emit light, but achieve display by reflecting ambient light. After the reading mode is activated, these reflective pixels will locally change color according to the content to be displayed. For example, to display the word "apple", the reflective pixels in the corresponding text area will change color to contrast with the background, allowing users to see clear text.

[0005] Generally speaking, traditional reflective display technology has a slow response speed because it takes a certain amount of time for the pixel color to change. Summary of the Invention

[0006] The present application provides a display panel and a display device to solve the technical problem of slow response speed of traditional reflective pixels used in OLED screens in the above-mentioned prior art.

[0007] The present invention provides a display panel comprising: a first substrate and a plurality of pixel units arranged in an array on the first substrate, wherein the pixel units are in a light-transmitting state when not powered; the display panel further comprising a second substrate and a reflective color display device, wherein the second substrate is located on a side of the first substrate facing away from the pixel units, the reflective color display device being sandwiched between the first and second substrates, and one reflective color display device being provided for each pixel unit;

[0008] The reflective color display device includes a curved reflective mirror and a accommodating cavity. The accommodating cavity is configured to display black or white by adjusting the color ratio under preset conditions. The display area of ​​the accommodating cavity is arranged close to one side of the curved reflective mirror, and is used to transmit the color display light of the accommodating cavity to the reflective surface of the curved reflective mirror. The accommodating cavity is located at the focal position of the curved reflective mirror. Through the reflection effect of the curved reflective surface, the color display light of the accommodating cavity is transmitted to the external environment through at least one pixel unit.

[0009] The accommodating cavity includes a first area and a second area, the first area is connected to the second area, the first area is located on a side of the second area close to the first substrate, each wall of the first area is normally white, and the second area is filled with nano-ferroferric oxide; the display panel also includes a transparent window, the transparent window is located on a side of the first area close to the curved reflective mirror surface;

[0010] The nano-ferroferric oxide is electrified to make the nanoparticles move to the first area, and outdoor light is incident on the accommodating cavity (42) through the reflection effect of the reflection surface and acts on the first area to obtain color light. The color light is transmitted through the transparent window to the reflection surface of the curved reflective mirror, and the color of the color light is transmitted to the external environment through at least one pixel unit through the reflection effect of the reflection surface.

[0011] In which, the display panel also includes a second electrode layer and a first electrode layer, the second electrode layer is sandwiched between the first substrate and the second substrate, the first electrode layer is located on the side of the second substrate away from the first substrate, and a positive electric field or a negative electric field is formed between the second electrode layer and the first electrode layer to drive the nano-ferroferric oxide to move between the first area and the second area.

[0012] The display panel further includes a first driving transistor layer, and the first driving transistor layer is electrically connected to the first electrode layer and the second electrode layer.

[0013] The curved reflective mirror is constructed as a single structural surface with a curvature radius gradually decreasing from one end to the other end, the one end is the side where the focus is located, and there is a vacuum-filled space between the single structural surface and the transparent window.

[0014] In which, the curved reflective mirror surface includes a first structural area and a second structural area, and the first structural area and the second structural area are respectively constructed as a single structural surface with a curvature radius gradually decreasing from one end to the other end, the one end is the side where the focus is located, and the endpoints of the ends with the smallest curvature radius of the two coincide; two of the accommodating cavities and the transparent windows are each provided, one of the accommodating cavities is located at the focal position of the first structural area, and the other of the accommodating cavities is located at the focal position of the second structural area.

[0015] In which, the curved reflective mirror is constructed as a solid structure, which is a structure with a cavity inside formed by a first plane, a first longitudinal surface and a first curved surface. The first curved surface is constructed as a structural curved surface with a curvature radius gradually decreasing from one end to the other end, and the cavity is configured to be filled with any one of air, helium, hydrogen or fine dust particles.

[0016] In which, the curved reflective mirror surface includes a first solid area and a second solid area, the first solid area is surrounded by a second plane, a second longitudinal surface and a second curved surface to form a structure with a cavity inside, and the second solid area is surrounded by a third plane, a third longitudinal surface and a third curved surface to form a structure with a cavity inside, and each of the cavities is configured to be filled with any one of air, helium, hydrogen or fine dust particles.

[0017] In which, the display panel also includes a second driving transistor layer, multiple isolation columns, multiple light-emitting layers and an encapsulation layer. The second driving transistor layer is arranged on the side of the first substrate away from the second substrate. Each isolation column is used to isolate two adjacent pixel units. Each pixel unit is provided with a light-emitting layer, and the encapsulation layer is covered on each isolation column and each light-emitting layer.

[0018] The display device provided in the present application includes the above-mentioned display panel.

[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0020] The display panel and display device provided in the embodiments of the present application add a second substrate and a reflective color display device to the traditional OLED display panel. Specifically, the reflective color display device includes a curved reflective mirror and a receiving cavity, wherein the receiving cavity is located at the focal position of the curved reflective mirror. The receiving cavity is configured to display black or white by adjusting the color ratio under preset conditions. The display area of ​​the receiving cavity is arranged near one side of the curved reflective mirror, and is used to transmit the color light of the receiving cavity to the reflective surface of the curved reflective mirror. Through the reflection effect of the reflective surface, the color light of the receiving cavity is transmitted to the external environment through at least one of the pixel units. In this way, the color light obtained by combining the color ratio of the receiving cavity with the outdoor light can be quickly transmitted to the outdoors through the display area of ​​the OLED by reflection of the light, utilizing the propagation of light, and the response speed is relatively fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 A schematic cross-sectional view of a display panel according to an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a partial cross-sectional structure of a display panel provided in an embodiment of the present application involving the installation of a reflective color display device;

[0026] Figure 3 A schematic diagram of a curve involving a curved surface equation in a display panel provided in an embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of light emitted from a transparent window at a focal point in any direction and incident on a parabola, all emitted as parallel light parallel to the Y axis;

[0028] Figure 5 This is a schematic diagram of the structure of the curved reflective mirror in this application Figure 1 ;

[0029] Figure 6 This is a schematic diagram of the structure of the curved reflective mirror in this application Figure 2 .

[0030] Description of reference numerals:

[0031] 1. First substrate; 2. Display area; 21. Pixel unit; 22. Second driving transistor layer; 23. Encapsulation layer; 24. Isolation column; 25. Light-emitting layer; 3. Second substrate; 4. Reflective color display device; 41. Curved reflective mirror; 42. Accommodating cavity; 43. Transparent window; 421. First region; 422. Second region; 5. Second electrode layer; 6. First electrode layer; 7. First driving transistor layer; 411. First structural region; 412. Second structural region; 411A. First plane; 412A. First longitudinal surface; 413A. First curved surface; 413. First physical region; 414. Second physical region; 4131. Second plane; 4132. Second longitudinal surface; 4133. Second curved surface; 4141. Third plane; 4142. Third longitudinal surface; 4143. Third curved surface. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0034] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inside", "outside", "below", "beneath", "above", "above", "front", "back", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a position flip or a change in posture or a change in motion state, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device can be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptions used herein have been interpreted accordingly.

[0035] With the continuous evolution of display technology, LCD, OLED, and CRT technologies are becoming increasingly popular. OLED (Organic Light-Emitting Diode), due to its ability to combine display and lighting functions, is widely used in a variety of lighting scenarios, including homes, businesses, and cars. Existing OLED applications generally use PWM (Pulse Width Modulation) dimming technology to achieve varying brightness levels. At low brightness levels, PWM dimming may cause noticeable flickering on the screen. Prolonged exposure to a flickering screen can easily cause visual fatigue, dry eyes, headaches, and other discomfort, which can negatively impact the visual system over the long term.

[0036] To alleviate this problem, reflective pixels can be added to OLED. In normal display mode, the OLED layer works and displays images and content through its own light. When switched to reading mode, the OLED pixels stop emitting light, and the reflective pixels below take over the display task.

[0037] Reflective pixels don't actively emit light themselves, but instead reflect ambient light to achieve display. When reading mode is activated, these reflective pixels will locally change color based on the content being displayed. For example, to display the word "apple," the reflective pixels in the area corresponding to the text will change color, creating contrast with the background and allowing users to see the text clearly.

[0038] Generally speaking, it takes a certain amount of time for the color change of a pixel to complete, which leads to the problem of slow response speed in traditional reflective display technology.

[0039] To alleviate the above problems, refer to Figures 1-6 The embodiment of the present application provides a display panel that uses the reflection principle to reflect the color change of the display to the pixel unit 21, without having to wait for the entire pixel to completely change color before displaying. In this way, by utilizing the reflection characteristics of light, the local color change can be quickly propagated to the area where the entire pixel should be displayed, thereby improving the overall response speed of the reflective display.

[0040] Specifically, the display panel provided in the embodiment of the present application is referred to Figure 1 and Figure 2 , comprising: a first substrate 1 and a plurality of pixel units 21 arrayed on the first substrate 1, wherein each pixel unit 21 is in a light-transmitting state when no power is supplied, the display panel further comprising a second substrate 3 and a reflective color display device 4, the second substrate 3 being located on a side of the first substrate 1 away from the pixel unit 21, the reflective color display device 4 being sandwiched between the first substrate 1 and the second substrate 3, and a reflective color display device 4 being provided corresponding to at least one pixel unit 21; specifically, the reflective color display device 4 comprises a curved reflective mirror 41 and a accommodating cavity 42, the accommodating cavity 42 being configured to display black or white by adjusting the proportion of colors under preset conditions, the display area of ​​the accommodating cavity 42 being arranged close to one side of the curved reflective mirror 41, for transmitting the color display light of the accommodating cavity 42 to the reflective surface of the curved reflective mirror 41, the accommodating cavity 42 being located at a focal position of the curved reflective mirror 41, illustratively, the transparent window 43 being located at a focal position of the curved reflective mirror 41, and the color display light of the accommodating cavity 42 being transmitted to the external environment via at least one pixel unit 21 through the reflection action of the reflective surface.

[0041] Exemplarily, the accommodating cavity 42 can be understood as a groove with an opening at the top, or the accommodating cavity 42 can also be understood as a closed shell; when the accommodating cavity 42 adopts a groove with an opening at the top, the contact surface between the accommodating cavity 42 and the top surface can be kept sealed. When the accommodating cavity 42 adopts a closed shell, a position for accommodating the accommodating cavity 42 can be preset between the first substrate 1 and the second substrate 3, or on the first substrate 1 or the second substrate 3.

[0042] The present application does not limit the shape of the closed shell of the accommodating cavity 42. The closed shell can be any regular shape such as square, angular, circular, elliptical, diamond, etc., or the closed shell can also be any irregular shape.

[0043] Exemplarily, the first substrate 1 is a transparent substrate, and the second substrate 3 is a non-transparent substrate.

[0044] For example, the curved reflective surface can be understood as a quarter structure of an ellipse, so that the colored light in the accommodating cavity 42 at the focus can be irradiated to any position of the reflective surface, and through the reflection effect of the reflective surface, it is emitted to the display area 2 of the OLED in a direction perpendicular to the first substrate 1 and transmitted to the outdoors.

[0045] Exemplarily, the reflective surface of the curved reflective mirror 41 is configured as a curved reflective surface, and the aforementioned accommodating cavity 42 is located at the focal position of the curved reflective mirror 41, that is, the focal position is the focal position of the curved reflective surface. Or

[0046] Exemplarily, the reflective surface of the curved reflective mirror 41 is constructed as a multi-faceted structure consisting of multiple continuous planes connected at their ends, and the inscribed surfaces of the multi-faceted structure form a smooth curved reflective surface. The aforementioned accommodating cavity 42 is located at the focal position of the curved reflective mirror 41, that is, the focal position of the multi-faceted structure, and it can also be understood that the focal position is the focal position of the curved reflective surface.

[0047] For example, the color display light here is obtained by the light from outdoor light acting on the accommodating cavity 42 to display black or white by adjusting the color ratio under preset conditions. That is, outdoor light must be incident on the display panel of the embodiment of the present application to trigger the display effect of the reflective color display device 4 in the reading mode.

[0048] Thus, a second substrate 3 and a reflective color display device 4 are added to a conventional OLED display panel. The reflective color display device 4 includes a curved reflective mirror 41 and a receiving cavity 42. The receiving cavity 42 is located at the focal position of the curved reflective mirror 41. The receiving cavity 42 is configured to display black or white by adjusting the color ratio under preset conditions. The display area of ​​the receiving cavity 42 is located near one side of the curved reflective mirror 41, and is used to transmit the color-developed light from the receiving cavity 42 to the reflective surface of the curved reflective mirror 41. Through the reflection effect of the reflective surface, the color-developed light from the receiving cavity 42 is transmitted to the external environment through at least one pixel unit 21. In this way, the color-developed light obtained by combining the adjusted color ratio of the receiving cavity 42 with the outdoor light can be quickly transmitted to the outdoors through the OLED display area 2 by reflection of the light. By utilizing the propagation of light, the local color change can be reflected to the entire pixel point, and the response speed is relatively fast.

[0049] For example, the cross-section of the curved reflective mirror 41 in the embodiment of the present application is a parabola, and the center of the color display area is located at the focus of the parabola. The light reflected by the mirror seen by the human eye from the front of the screen all comes from the center of the color display area. That is, any parallel ambient light in the direction of the human eye's line of sight hits the mirror, the mirror is reflected to the color display area, and after reflection, it is reflected back to the reflective mirror, and then enters the human eye as parallel light in the direction of sight along the original path. Through this structural layout design, the image of the pixel points of the reflective display screen seen by the human eye all comes from the projection of the center of the color display area (the focus of the parabola). The color change of the point replaces the color change of the traditional electronic paper, which greatly shortens the response time.

[0050] refer to Figure 3 , take the lowest part of the arc surface as the origin, draw XY coordinates, and the arc surface equation is as follows:

[0051] x 2 =2py(P=0.36), take the curve within the interval of X: (0~0.291) or (-0.291~0).

[0052] refer to Figure 4 , take any point D on the parabola, draw the tangent AD, and the straight line DD' parallel to the y-axis, where D' is on the directrix of the parabola, connect FA and AD', FO=BD'=P / 2, OA=BA, so △FOA≌△D'BA (side-angle-side), so FA=D'A, and DF=DD' (definition of parabola), so △FDA≌△D'DA (side-side-side), so ∠FDA=∠ADB, ∠FDA=∠CDA'=∠ADB, therefore, light emitted from any direction of the focus, when it hits the parabola, is emitted as parallel light parallel to the Y-axis.

[0053] Considering the color rendering scheme of the accommodating cavity 42, in the display panel provided in the embodiment of the present application, the accommodating cavity 42 includes a first area 421 and a second area 422, the first area 421 is connected to the second area 422, the walls of the first area 421 are usually white, and the second area 422 is filled with nano-ferroferric oxide; further, the display panel also includes a transparent window 43, and the transparent window 43 is located on the side of the first area 421 close to the curved reflective mirror 41; the nano-ferroferric oxide is energized to cause the nanoparticles to swim to the first area 421, and outdoor light is reflected by the reflective surface into the accommodating cavity 42 and acts on the first area 421 to obtain colored light, which is transmitted to the reflective surface of the curved reflective mirror 41 through the transparent window 43. Through the reflection of the reflective surface, the color of the colored light is transmitted to the external environment through at least one pixel unit 21.

[0054] In this way, the nano-ferroferric oxide is normally located in the second area 422. When the nano-ferroferric oxide is positively charged, the bottom of the second area 422 is positively charged, and the nano-ferroferric oxide will move away from the bottom of the second area 422 and toward the first area 421. In this way, outdoor ambient light is projected onto the curved reflective mirror 41 and reflected onto the first area 421 of the accommodating cavity 42. The black color of the nano-ferroferric oxide in the first area 421 absorbs light, obtaining black colored light. The black colored light will pass through the transparent window 43 and then be projected onto the curved reflective mirror 41. Through the reflection of the light, it passes through the display area 2 of the OLED and is transmitted to the outdoors, thereby causing some pixel units to display black. When the nano-ferroferric oxide is located in the first region 421 and is positively charged, the bottom of the second region 422 is negatively charged, and the nano-ferroferric oxide moves away from the top of the first region 421 and toward the second region 422. In this way, the white outer wall of the first region of the accommodating cavity 42 does not absorb ambient light. The ambient light entering the display panel passes through the transparent window 43 in the form of white light and is emitted to the curved reflective mirror 41. The light is then reflected through the display region 2 of the OLED and transmitted to the outdoors, thereby causing some pixel units to display white.

[0055] Considering the electric field driving scheme for the additional nano-ferroferric oxide, the display panel provided in the embodiment of the present application also includes a second electrode layer 5 and a first electrode layer 6, wherein the second electrode layer 5 is sandwiched between the first substrate 1 and the second substrate 3, and the first electrode layer 6 is located on the side of the second substrate 3 away from the first substrate 1. A positive electric field or a negative electric field is formed between the second electrode layer 5 and the first electrode layer 6 to drive the nano-ferroferric oxide to move between the first area 421 and the second area 422.

[0056] Exemplarily, both the second electrode layer 5 and the first electrode layer 6 are made of ITO film layers.

[0057] Thus, when the nano-iron tetroxide is positively charged, a negative electric field is formed between the first electrode layer 6 and the second electrode layer 5. This negative electric field causes the nano-iron tetroxide to remain stationary in the second region 422 of the accommodating cavity 42. The white outer wall of the first region 421 does not absorb outdoor ambient light, resulting in white color light. This white color light is emitted through the transparent window 43 to the curved reflective mirror 41, thereby causing the entire area of ​​the curved reflective mirror 41 corresponding to some pixel units to display white toward the outdoors. When the nano-iron tetroxide is positively charged, a positive electric field is formed between the first electrode layer 6 and the second electrode layer 5. This positive electric field causes the nano-iron tetroxide to move toward the first region 421 of the accommodating cavity 42. The black particles in the first region 421 absorb outdoor ambient light, thereby obtaining black color light. This black color light is emitted through the transparent window 43 to the curved reflective mirror 41, thereby causing the entire area of ​​the curved reflective mirror 41 corresponding to some pixel units to display black toward the outdoors.

[0058] Alternatively, when the nano-iron tetroxide is negatively charged, a positive electric field is formed between the first electrode layer 6 and the second electrode layer 5. This positive electric field causes the nano-iron tetroxide to remain stationary in the second area 422 of the accommodating cavity 42. The white outer wall of the first area 421 does not absorb outdoor ambient light, resulting in white color light. This white color light is emitted through the transparent window 43 to the curved reflective mirror 41, thereby causing the entire area of ​​the curved reflective mirror 41 corresponding to some pixel units to display white toward the outdoors. When the nano-iron tetroxide is negatively charged, a negative electric field is formed between the first electrode layer 6 and the second electrode layer 5. This negative electric field causes the nano-iron tetroxide to move toward the first area 421 of the accommodating cavity 42. The black particles in the first area 421 absorb outdoor ambient light, thereby obtaining black color light. This black color light is emitted through the transparent window 43 to the curved reflective mirror 41, thereby causing the entire area of ​​the curved reflective mirror 41 corresponding to some pixel units to display black toward the outdoors.

[0059] Considering the charging scheme of the first electrode layer 6 , the display panel provided in the embodiment of the present application further includes a first driving transistor layer 7 , which is electrically connected to the first electrode layer 6 .

[0060] Exemplarily, the drain electrodes of the first driving transistor layer 7 are respectively electrically connected to the second areas 422 of the accommodating cavities 42 .

[0061] In this way, the voltage supply of the nano-ferroferric oxide in the second region 422 can be ensured.

[0062] Considering one of the construction schemes of the curved reflective mirror 41, in the display panel provided in the embodiment of the present application, the curved reflective mirror 41 can be constructed as a single structural surface with a curvature radius gradually decreasing from one end to the other end. For example, one end is the side where the focus is located, and there is a vacuum-filled space between the single structural surface and the transparent window 43.

[0063] In this way, a single structural surface with a curvature radius gradually decreasing from one end to the other can form a partial curved line of an ellipse. Since the accommodating cavity 42 is located at the focal position of the curved reflective mirror 41, and there is a vacuum-filled space between the single structural surface of the curved reflective mirror 41 and the transparent window 43, the refractive index of the color light emitted from the accommodating cavity 42 to the curved reflective mirror 41 through the transparent window 43 can be minimized, thereby reducing light loss.

[0064] Considering the second construction scheme of the curved reflective mirror 41, in the display panel provided in the embodiment of the present application, the curved reflective mirror 41 may include a first structural area 411 and a second structural area 412, and the first structural area 411 and the second structural area 412 are respectively constructed as a single structural surface with a curvature radius gradually decreasing from one end to the other end. For example, one end is the side where the focus is located, and the endpoints of the ends with the smallest curvature radius of the two coincide; two accommodating cavities 42 and two transparent windows 43 are provided, one accommodating cavity 42 is located at the focal position of the first structural area 411, and the other accommodating cavity 42 is located at the focal position of the second structural area 412.

[0065] For example, the first structural area 411 and the second structural area 412 may be centrally symmetrical structures relative to the central axis.

[0066] Exemplarily, the first structural area 411 and the second structural area 412 can be respectively constructed as partial curved lines of an ellipse. Since the accommodating cavity 42 is located at the focal position of each curved reflective mirror surface 41, that is, one of the accommodating cavities 42 is located at the focal position of the first structural area 411, and the other accommodating cavity 42 is located at the focal position of the second structural area 412.

[0067] In this way, two accommodating cavities 42 can be set in one of the pixel units 21 of the OLED screen, and each accommodating cavity 42 matches a first structural area 411 or a second structural area 412 respectively. Combined with the structural characteristics of the first structural area 411 and the second structural area 412, the colored light of the two structural areas can be simultaneously transmitted out of the OLED display area 2 through the reflection effect of their respective corresponding curved reflective mirrors 41, which is equivalent to increasing the number of sub-pixels and can further improve the resolution of the display panel.

[0068] Considering the third construction scheme of the curved reflective mirror 41, in the display panel provided in the embodiment of the present application, the curved reflective mirror 41 can also be constructed as a solid structure, which is formed by a first plane 411A, a first longitudinal surface 412A and a first curved surface 413A, and has a cavity inside. The first curved surface 413A is constructed as a structural curved surface with a curvature radius gradually decreasing from one end to the other end. For example, the other end is located on the side where the focus is located, and the cavity is configured to be filled with any one of air, helium, hydrogen or fine dust particles.

[0069] In this way, the refractive index of the colored light from the accommodating cavity 42 that is incident on the curved reflective mirror surface 41 through the transparent window 43 can be minimized, thereby reducing light loss.

[0070] Considering the fourth construction scheme of the curved reflective mirror 41, in the display panel provided in the embodiment of the present application, the curved reflective mirror 41 includes a first physical area 413 and a second physical area 414, wherein the first physical area 413 is formed by a second plane 4131, a second longitudinal surface 4132 and a second curved surface 4133 to form a structure with a cavity inside, and the second physical area 414 is formed by a third plane 4141, a third longitudinal surface 4142 and a third curved surface 4143 to form a structure with a cavity inside, and each cavity is configured to be filled with any one of air, helium, hydrogen or fine dust particles.

[0071] In this way, the refractive index of the color light from the accommodating cavity 42 that is incident on the curved reflective mirror 41 through the transparent window 43 can be minimized, thereby reducing light loss and increasing the display resolution of the display panel.

[0072] Considering the display structure of the OLED display layer of the embodiment of the present application, the display panel provided in the embodiment of the present application also includes a second driving transistor layer 22, multiple isolation columns 24, multiple light-emitting layers 25 and an encapsulation layer 23. The second driving transistor layer 22 is arranged on the side of the first substrate 1 away from the second substrate 3. Each isolation column 24 is used to isolate two adjacent pixel units 21. Each pixel unit 21 is provided with a light-emitting layer 25. The light-emitting layer 25 is located on the display side of the display area 2, and the encapsulation layer 23 is covered on each isolation column 24 and each light-emitting layer 25.

[0073] For example, the encapsulation layer 23 plays a role of protection and dust prevention, the isolation column 24 can isolate two adjacent pixel units 21 , and the light-emitting layer 25 is an organic light-emitting layer 25 .

[0074] The second driving transistor layer 22 is referred to as a field effect transistor for ease of description. For example, a field effect transistor (FET) plays a key control role in the display panel. The field effect transistor generally includes a source, a drain and a gate. The current starts from the power supply. When a pixel needs to be lit, an appropriate voltage is applied to the gate of the FET under the action of the control signal. For an n-type FET, this voltage is a positive voltage relative to the source. This voltage forms a conductive channel between the source and drain of the FET. The source is usually connected to a circuit that can provide charge (such as electrons). In this conductive state, electrons can flow from the source through the FET to the drain, and eventually reach the cathode of the OLED pixel, injecting electrons into the cathode.

[0075] In this way, a display panel with stronger structural stability can be obtained.

[0076] At the same time, another circuit delivers current to the pixel's anode, injecting holes into the anode. The current paths of the anode and cathode work in tandem. When the holes injected from the anode and the electrons injected from the cathode (via the current path controlled by the FET) meet in the organic light-emitting layer 25, they recombine to form excitons, which then return to their ground state and emit light.

[0077] Logically speaking, if the gate voltage is not applied properly, the FET cannot conduct, and thus electrons cannot be effectively transported to the cathode. Even if holes are injected into the anode, the OLED pixel will not emit light or emit very weakly due to the lack of sufficient electrons to recombine with them. Only when the gate voltage causes the FET to conduct normally, ensuring a smooth current path between the source and drain, and allowing sufficient electrons to meet and recombine with holes in the organic light-emitting layer 25, can the OLED pixel emit light normally. By adjusting the gate voltage to change the current between the source and drain, the brightness of the light can be controlled.

[0078] An embodiment of the present application further provides a display device, including the above-mentioned display panel, which can achieve all the effects of the display panel and will not be described in detail here.

[0079] At present, both OLED and LCD mobile phones have a reading mode. When reading, a black background with white text is used to reduce damage to the eyes, but white is still an active light-emitting display mode and is still harmful to the eyes. The display panel and display device of the embodiment of the present application are provided with a reflective color display device 4 below the organic color display layer. When entering the reading mode, the organic color display layer is not powered on and is in a transparent state (the pixels adopt transparent pixel technology). The reflective pixel points below are used for color display, and the text is displayed by reflecting natural light to avoid damage to the eyes caused by the screen light. Furthermore, the reflective pixel point color display of the reflective color display device 4 can reduce the attenuation of the screen life and increase the life of the whole machine. Specifically, there is an arc-shaped mirror reflection device in the pixel point of the reflective display area, and this mirror reflects the local color change area on the left and right sides. The local color change area has a groove design, the inner wall of the groove is white, the reflective area has a transparent window, and the groove has nano-ferroferric tetroxide (nano-ferroferric tetroxide is a black liquid material that can be magnetic and charged). When white is desired, the TFT controls the electrode limits, causing the black ferroferric oxide to sink to the bottom. The concave mirror then reflects the white recessed walls, displaying white. Conversely, when black is desired, the black ferroferric oxide is controlled to adsorb upward, adsorbing the black color to the transparent window. The concave mirror then reflects the black ferroferric oxide, displaying black. Using the reflective color display device 4 of the present embodiment, localized color changes can be reflected across the entire pixel, significantly improving response speed compared to electrophoretic color change across the entire pixel.

[0080] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0081] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0082] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A display panel, comprising: A first substrate (1) and a plurality of pixel units (21) arrayed and distributed on the first substrate (1), characterized in that the pixel units are in a light-transmitting state when not powered, the display panel further comprising a second substrate (3) and a reflective color display device (4), the second substrate (3) being located on a side of the first substrate (1) facing away from the pixel units (21), the reflective color display device (4) being sandwiched between the first substrate (1) and the second substrate (3), and one reflective color display device (4) being provided corresponding to at least one pixel unit (21); The reflective color display device (4) includes a curved reflective mirror (41) and a receiving cavity (42), wherein the receiving cavity (42) is configured to display black or white by adjusting the proportion of colors under preset conditions, and the receiving cavity (42) includes a first area (421) and a second area (422), wherein the first area (421) is connected to the second area (422), the first area (421) is located on a side of the second area (422) close to the first substrate (1), and each wall of the first area (421) is The surface is always white, and the second area (422) is filled with nano-ferroferric oxide; the display area of ​​the accommodating cavity (42) is arranged close to one side of the curved reflective mirror (41), and is used to transmit the color light of the accommodating cavity (42) to the reflective surface of the curved reflective mirror (41); the accommodating cavity (42) is located at the focal position of the curved reflective mirror (41), and the color light of the accommodating cavity (42) is transmitted to the external environment through at least one of the pixel units (21) through the reflection effect of the reflective surface.

2. The display panel according to claim 1, wherein: The display panel further comprises a transparent window (43), wherein the transparent window (43) is located on a side of the first area (421) close to the curved reflective mirror surface (41); The nano-iron tetroxide is electrified to make the nanoparticles move to the first area (421), and outdoor light is incident on the accommodating cavity (42) through the reflection effect of the reflection surface, and acts on the first area to obtain color light. The color light is transmitted to the reflection surface of the curved reflective mirror (41) through the transparent window (43), and the color of the color light is transmitted to the external environment through at least one pixel unit (21) through the reflection effect of the reflection surface.

3. The display panel according to claim 2, wherein: The display panel further comprises a second electrode layer (5) and a first electrode layer (6), wherein the second electrode layer (5) is sandwiched between the first substrate (1) and the second substrate (3), and the first electrode layer (6) is located on a side of the second substrate (3) away from the first substrate (1), and a positive electric field or a negative electric field is formed between the second electrode layer (5) and the first electrode layer (6) for driving the nano-ferrosoferric oxide to move between the first region (421) and the second region (422).

4. The display panel according to claim 3, wherein: The display panel further comprises a first driving transistor layer (7), wherein the first driving transistor layer (7) is electrically connected to the first electrode layer (6) and the second electrode layer (5).

5. The display panel according to claim 1, wherein: The display panel further comprises a transparent window (43), wherein the transparent window (43) is located on a side of the first area (421) close to the curved reflective mirror (41); the curved reflective mirror (41) is constructed as a single structural surface with a curvature radius gradually decreasing from one end to the other end, the one end being the side where the focus is located, and a vacuum-filled space between the single structural surface and the transparent window (43).

6. The display panel according to claim 1, wherein: The display panel further comprises a transparent window (43), and the transparent window (43) is located on a side of the first area (421) close to the curved reflective mirror (41); the curved reflective mirror (41) comprises a first structural area (411) and a second structural area (412), and the first structural area (411) and the second structural area (412) are respectively constructed as a single structural surface with a curvature radius gradually decreasing from one end to the other end, the one end being the side where the focus is located, and the endpoints of the ends with the smallest curvature radius of the two coincide with each other; two accommodating cavities (42) and two transparent windows (43) are each provided, one accommodating cavity (42) is located at the focal position of the first structural area (411), and the other accommodating cavity (42) is located at the focal position of the second structural area (412).

7. The display panel according to claim 1, wherein: The curved reflective mirror surface (41) is constructed as a solid structure, the solid structure being formed by a first plane (411A), a first longitudinal surface (412A) and a first curved surface (413A), and having a cavity inside. The first curved surface (413A) is constructed as a structural curved surface with a curvature radius gradually decreasing from one end to the other end, and the cavity is configured to be filled with any one of air, helium, hydrogen or fine dust particles.

8. The display panel according to claim 1, wherein: The curved reflective mirror (41) includes a first solid area (413) and a second solid area (414), wherein the first solid area (413) is enclosed by a second plane (4131), a second longitudinal surface (4132) and a second curved surface (4133) to form a structure having a cavity inside, and the second solid area (414) is enclosed by a third plane (4141), a third longitudinal surface (4142) and a third curved surface (4143) to form a structure having a cavity inside, and each of the cavities is configured to be filled with any one of air, helium, hydrogen or fine dust particles.

9. The display panel according to claim 1, wherein: The display panel further comprises a second driving transistor layer (22), a plurality of isolation columns (24), a plurality of light-emitting layers (25) and an encapsulation layer (23); the second driving transistor layer (22) is arranged on a side of the first substrate (1) away from the second substrate (3); each isolation column (24) is used to isolate two adjacent pixel units (21); each pixel unit (21) is provided with a light-emitting layer (25); and the encapsulation layer (23) is covered on each isolation column (24) and each light-emitting layer (25).

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 9.

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