Display panel and display device

Abstract

The invention relates to a display panel and a display device. The display panel comprises a first substrate and a plurality of pixel units distributed on the first substrate in an array mode, the pixel units are in a light transmitting state under the power-off condition, the display panel further comprises a second substrate and a reflective color developing device, the second substrate is located on the side, away from the pixel units, of the first substrate, and the reflective color developing device is located on the side, away from the pixel units, of the second substrate. The reflective color developing devices are clamped between the first substrate and the second substrate, and at least one pixel unit is correspondingly provided with one reflective color developing device; the reflective color developing device comprises a curved surface reflecting mirror surface and a containing cavity, the containing cavity is configured to display black or white by adjusting the color proportion under the preset condition, and a display area of the containing cavity is arranged close to one side of the curved surface reflecting mirror surface and used for transmitting color developing light of the containing cavity to a reflecting surface of the curved surface reflecting mirror surface. The containing cavity is located at the focus position of the curved reflecting surface, and the color developing light of the containing cavity is transmitted to the external environment through the at least one pixel unit under the reflection effect of the curved reflecting 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 has the advantages of high color gamut, thinness, and fast response. Currently, high-end mobile phone displays all use this technology. However, this technology uses PWM dimming to control brightness, and long-term use is harmful to the eyes. At the same time, the life of organic light-emitting materials is still shorter than that of LCDs, and long-term use will cause color deviation and screen burn-in.

[0003] Specifically, some OLED screens use PWM (pulse width modulation) dimming technology to achieve different brightness adjustments. At low brightness, PWM dimming may cause obvious flickering on the screen. If the human eye focuses on a flickering screen for a long time, it is easy to cause visual fatigue, dry eyes, headaches and other discomfort symptoms, which may have adverse effects on the visual system of the eyes in the long run.

[0004] In order to alleviate the above-mentioned stroboscopic problem, reflective pixels are generally added to the OLED screen. In normal display mode, the OLED layer works to present 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 instead reflect ambient light to achieve display. After the reading mode is activated, these reflective pixels will change color locally 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 color of a pixel 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 applied to OLED screens in the above-mentioned prior art.

[0007] The display panel provided by the present invention comprises: a first substrate and a plurality of pixel units arrayed and distributed on the first substrate, wherein the pixel units are in a light-transmitting state when not powered on, and the display panel further comprises a second substrate and a reflective color display device, wherein the second substrate is located on a side of the first substrate away from the pixel units, the reflective color display device is sandwiched between the first substrate and the second substrate, and one reflective color display device is correspondingly provided for at least one pixel unit;

[0008] The reflective color display device includes a curved reflective mirror and a accommodating cavity, wherein the accommodating cavity is configured to display black or white by adjusting the proportion of colors under preset conditions, and a 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, and through the reflection effect of the curved reflective surface, the color display light of the accommodating cavity is transmitted to the external environment via at least one of the pixel units.

[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 always white, and the second area is filled with nano-iron tetroxide; the display panel also includes a transparent window, and the transparent window is located on a side of the first area close to the curved reflective mirror surface;

[0010] The nano-iron tetroxide is electrified to make the nano-particles swim to the first area, outdoor light is incident into 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 reflection mirror through the transparent window, and the color of the color light is transmitted to the external environment through at least one of the pixel units through the reflection effect of the reflection surface.

[0011] Among them, 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 surface 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 filling space between the single structural surface and the transparent window.

[0014] Wherein, the curved reflective mirror surface includes a first structural area and a second structural area, 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 window 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] Among them, the curved reflective mirror surface is constructed as a solid structure, and the solid structure is a structure with a cavity inside which is enclosed 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] The curved reflective mirror surface includes a first solid area and a second solid area, the first solid area is formed 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 formed 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] Among them, the display panel also includes a second driving transistor layer, a plurality of isolation columns, a plurality of light-emitting layers and a packaging 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 packaging layer covers 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 embodiment of the present application are provided with a second substrate and a reflective color display device on 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, and the receiving cavity is configured to display black or white by adjusting the proportion of colors under preset conditions, and 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, and 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 adjusting proportion of the color in the receiving cavity with the outdoor light can be quickly transmitted to the outdoors through the display area of ​​the OLED through the reflection of the light, and the response speed is fast by utilizing the propagation of light. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 A schematic diagram of a cross-sectional structure of a display panel provided in 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 It is a schematic diagram of light in any direction emitted from a transparent window at a focus in the present application, and emitted as parallel light parallel to the Y axis when it hits a parabola;

[0028] Figure 5 The structure of the curved reflective mirror in this application is shown in FIG. Figure 1 ;

[0029] Figure 6 The structure of the curved reflective mirror in this application is shown in FIG. 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 reflecting mirror; 42. Accommodating cavity; 43. Transparent window; 421. First area; 422. Second area; 5. Second electrode layer; 6. First electrode layer; 7. First driving transistor layer; 411. First structural area; 412. Second structural area; 411A. First plane; 412A. First longitudinal surface; 413A. First curved surface; 413. First physical area; 414. Second physical area; 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0034] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a change in posture or a change in motion state, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptions used herein have been interpreted accordingly.

[0035] With the continuous changes in display technology, the technologies of LCD, OLED and CRT tubes have gradually become popular. Among them, OLED (Organic Light-Emitting Diode) is widely used in various lighting scenarios such as home, business, and automobiles based on its characteristics of having display and lighting functions. In order to achieve different brightness adjustments, the existing OLED applications generally use PWM (pulse width modulation) dimming technology. At low brightness, PWM dimming may cause obvious flickering on the screen. If the human eye stares at a flickering screen for a long time, it is easy to cause visual fatigue, dry eyes, headaches and other discomfort symptoms, which may have adverse effects on the visual system of the eyes in the long run.

[0036] To alleviate this problem, reflective pixels can be added to OLED. In normal display mode, the OLED layer works and presents images and content by emitting 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.

[0037] The reflective pixels themselves do not emit light actively, but reflect ambient light to achieve display. After the reading mode is activated, these reflective pixels will change color locally 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 form a contrast with the background, so that users can see clear text.

[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 Figure 1-Figure 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. There is no need 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 and distributed 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 arranged corresponding to at least one pixel unit 21; specifically, the reflective color display device 4 comprises a curved reflective mirror surface 41 and a receiving cavity 42, the receiving cavity 42 being configured to display black or white by adjusting the proportion of colors under preset conditions, a display area of ​​the receiving cavity 42 being arranged close to one side of the curved reflective mirror surface 41, for transmitting the color light of the receiving cavity 42 to the reflective surface of the curved reflective mirror surface 41, the receiving cavity 42 being located at a focal position of the curved reflective mirror surface 41, illustratively, the transparent window 43 being located at a focal position of the curved reflective mirror surface 41, and the color light of the receiving cavity 42 being transmitted to the external environment via at least one pixel unit 21 through the reflection effect of the reflective surface.

[0041] Exemplarily, the accommodating cavity 42 can be understood as a groove with an opening on 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 on the top, the contact surface between the accommodating cavity 42 and the top surface can be kept sealed, and 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] Exemplarily, the curved reflective surface can be understood as a quarter structure of an ellipse, so that the color light of the accommodating cavity 42 located at the focus can be irradiated to any position of the reflective surface, and through the reflection effect of the reflective surface, it can be shot 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 accommodation 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.

[0046] Exemplarily, the reflective surface of the curved reflective mirror 41 is constructed as a multi-faceted structure with multiple continuous planes connected to each other, and the inner surface of the multi-faceted structure constitutes 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 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] Exemplarily, the colored light here is obtained by the light emitted by 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 enters 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] In this way, a second substrate 3 and a reflective color display device 4 are added to the conventional OLED display panel, wherein the reflective color display device 4 includes a curved reflective mirror 41 and a receiving cavity 42, wherein the receiving cavity 42 is located at the focal position of the curved reflective mirror 41, and the receiving cavity 42 is configured to display black or white by adjusting the proportion of colors under preset conditions, and the display area of ​​the receiving cavity 42 is arranged close to one side of the curved reflective mirror 41, and is used to transmit the color light of the receiving cavity 42 to the reflective surface of the curved reflective mirror 41, and through the reflection effect of the reflective surface, the color light of the receiving cavity 42 is transmitted to the external environment through at least one pixel unit 21. In this way, the color light obtained by combining the proportion of the color adjusted in the receiving cavity 42 with the outdoor light can be quickly transmitted to the outdoors through the display area 2 of the OLED through the reflection of the light, and the local color change can be reflected to the entire pixel point by utilizing the propagation of light, and the response speed is relatively fast.

[0049] Exemplarily, the cross section of the curved reflective mirror surface 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 surface 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 surface, the mirror surface reflects to the color display area, and then reflects back to the reflective mirror surface, and then enters the human eye as parallel light in the direction of the line of sight. 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 surface, which greatly shortens the response time.

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

[0051] x 2 =2py(P=0.36), take the curve in 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, thus △FOA≌△D'BA (side-angle-side), thus FA=D'A, and DF=DD' (definition of parabola), thus △FDA≌△D'DA (side-side-side), thus ∠FDA=∠ADB, ∠FDA=∠CDA'=∠ADB, therefore, light emitted from any direction from 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 make the nanoparticles 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, and the color of the colored light is transmitted to the external environment through at least one pixel unit 21 through the reflection of the reflective surface.

[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, the outdoor ambient light is projected onto the curved reflective mirror 41 and reflected to the first area 421 of the accommodating cavity 42. The black color of the nano-ferroferric oxide in the first area 421 absorbs light to obtain black color light. The black color light will pass through the transparent window 43 and then be projected to 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 making some pixel units display black. When the nano-iron tetroxide is located in the first area 421, and the nano-iron tetroxide is positively charged, and the bottom of the second area 422 is negatively charged, the nano-iron tetroxide will move away from the top of the first area 421 and toward the second area 422. In this way, the white color of the outer wall of the first area of ​​the accommodating cavity 42 does not absorb ambient light, and the ambient light entering the display panel is emitted to the curved reflective mirror surface 41 through the transparent window 43 in the form of white light, and then passes through the display area 2 of the OLED and is transmitted to the outdoors through the reflection of the light, thereby making some pixel units 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, and 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, the second electrode layer 5 and the first electrode layer 6 are both made of ITO film layers.

[0057] In this way, 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, and the negative electric field will cause the nano-iron tetroxide to be located in the second area 422 of the accommodating cavity 42 and not move, and the white outer wall of the first area 421 will not absorb the outdoor ambient light, and a white color light will be obtained, and the white color light will be projected to the curved reflective mirror surface 41 through the transparent window 43, so that the entire area of ​​the curved reflective mirror surface 41 corresponding to the partial pixel units will 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, and the positive electric field will cause the nano-iron tetroxide to move toward the first area 421 of the accommodating cavity 42, and the black particles in the first area 421 will absorb the outdoor ambient light, so a black color light will be obtained, and the black color light will be projected to the curved reflective mirror surface 41 through the transparent window 43, so that the entire area of ​​the curved reflective mirror surface 41 corresponding to the partial pixel units will 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, and the positive electric field will cause the nano-iron tetroxide to be located in the second area 422 of the accommodating cavity 42 and not move, and the white outer wall of the first area 421 will not absorb the outdoor ambient light, and a white color light will be obtained, and the white color light will be projected to the curved reflective mirror surface 41 through the transparent window 43, so that the entire area of ​​the curved reflective mirror surface 41 corresponding to the partial pixel units will 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, and the negative electric field will cause the nano-iron tetroxide to move toward the first area 421 of the accommodating cavity 42, and the black particles in the first area 421 will absorb the outdoor ambient light, so a black color light will be obtained, and the black color light will be projected to the curved reflective mirror surface 41 through the transparent window 43, so that the entire area of ​​the curved reflective mirror surface 41 corresponding to the partial pixel units will 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 , and the first driving transistor layer 7 is electrically connected to the first electrode layer 6 .

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

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

[0062] Considering one of the construction schemes of the curved reflective mirror surface 41, in the display panel provided in the embodiment of the present application, the curved reflective mirror surface 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 filling space between the single structural surface and the transparent window 43.

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

[0064] Considering the second construction scheme of the curved reflective mirror surface 41, in the display panel provided in the embodiment of the present application, the curved reflective mirror surface 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. Exemplarily, one end is the focal side, 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 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.

[0065] Exemplarily, the first structural area 411 and the second structural area 412 may be structures that are centrally symmetrical with respect 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 display area 2 of the OLED 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 a structure with a cavity inside, formed by a first plane 411A, a first longitudinal surface 412A and a first curved surface 413A. 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. Exemplarily, 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 color light from the accommodating cavity 42 that is emitted to 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 emitted to the curved reflective mirror surface 41 via 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, 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 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. The encapsulation layer 23 covers each isolation column 24 and each light-emitting layer 25.

[0073] Exemplarily, 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 field effect transistor for ease of description. For example, field effect transistor (FET) plays a key control role in the display panel. 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 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 on state, electrons can flow from the source through the FET to the drain, and finally reach the cathode of the OLED pixel to inject electrons into the cathode.

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

[0076] At the same time, another line delivers current to the anode of the pixel to inject holes into the anode. The current paths of the anode and cathode are coordinated with each other. When the holes injected from the anode and the electrons injected from the cathode (through the current path controlled by the FET) meet in the organic light-emitting layer 25, they will recombine to form excitons, and the excitons will emit light when they return to the ground state.

[0077] Logically speaking, if the gate does not apply a suitable voltage, the FET cannot be turned on, and the 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 weak light due to the lack of sufficient electrons to recombine with them. Only when the gate voltage makes the FET turn on normally, ensuring that the current path between the source and the drain is unobstructed, and allowing sufficient electrons to meet and recombine with holes in the organic light-emitting layer 25, can the OLED pixel emit light normally, and by adjusting the gate voltage to change the current between the source and the drain, the brightness of the light can be controlled.

[0078] The embodiment of the present application further provides a display device, including the above-mentioned display panel, which can obtain all the effects of the display panel and will not be elaborated 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, which 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 for color display, and is in a transparent state (the pixel adopts transparent pixel technology), and the reflective pixel points below are used for color display, and the text is displayed by natural light reflection to avoid damage to the eyes caused by the screen light. Further, the reflective pixel point color display of the reflective color display device 4 can reduce the delay of screen life attenuation 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 reflection area has a transparent window, and there is nano-iron tetroxide in the groove (nano-iron tetroxide is a black liquid material that can be magnetic and charged). When it is necessary to display white, the electrode limit is controlled by TFT, so that the black ferroferric oxide is controlled to sink to the bottom, and the concave mirror reflects the white groove wall to display white. On the contrary, when it is necessary to display black, the black ferroferric oxide is controlled to be adsorbed upward, and the black is adsorbed to the transparent window. At this time, the concave mirror reflects the black ferroferric oxide and displays black. The reflective color display device 4 of the embodiment of the present application can achieve the reflection of the local color change to the entire pixel point, which greatly improves the response speed relative to the electrophoretic color change of the entire pixel point.

[0080] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments 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 "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence 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 interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order 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, 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 is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to 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) arranged in an array on the first substrate (1), characterized in that the pixel units are 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 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) comprises a curved reflective mirror surface (41) and a receiving cavity (42); the receiving cavity (42) is configured to display black or white by adjusting the proportion of colors under preset conditions; a display area of ​​the receiving cavity (42) is arranged close to one side of the curved reflective mirror surface (41) and is used to transmit the color display light of the receiving cavity (42) to the reflective surface of the curved reflective mirror surface (41); the receiving cavity (42) is located at the focal position of the curved reflective mirror surface (41); and through the reflection effect of the reflective surface, the color display light of the receiving cavity (42) is transmitted to the external environment via at least one of the pixel units (21).

2. The display panel according to claim 1, characterized in that: The accommodating cavity (42) comprises a first area (421) and a second area (422), the first area (421) being connected to the second area (422), the first area (421) being located on a side of the second area (422) close to the first substrate (1), each wall surface of the first area (421) being normally white, and the second area (422) being filled with nano-ferroferric oxide; the display panel further comprises a transparent window (43), the transparent window (43) being 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 nano-particles swim to the first area (421); 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 reflection 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, characterized in that: The display panel further comprises a second electrode layer (5) and a first electrode layer (6); the second electrode layer (5) is sandwiched between the first substrate (1) and the second substrate (3); the first electrode layer (6) is located on a 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) for driving the nano-ferroferric oxide to move between the first region (421) and the second region (422).

4. The display panel according to claim 3, characterized in that: 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, characterized in that: The curved reflective mirror surface (41) is constructed as a single structure 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 filling space is provided between the single structure surface and the transparent window (43).

6. The display panel according to claim 1, characterized in that: The curved reflective mirror surface (41) comprises a first structural area (411) and a second structural area (412), 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 is 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 of the accommodating cavities (42) is located at the focal position of the first structural area (411), and the other of the accommodating cavities (42) is located at the focal position of the second structural area (412).

7. The display panel according to claim 1, characterized in that: The curved reflective mirror surface (41) is constructed as a solid structure, and the solid structure is formed by a first plane (411A), a first longitudinal surface (412A) and a first curved surface (413A) to form a structure with a cavity inside, and 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, characterized in that: The curved reflective mirror surface (41) includes a first solid area (413) and a second solid area (414), wherein the first solid area (413) is surrounded 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 surrounded 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, characterized in that: 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 a packaging 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 packaging layer (23) is covered on each isolation column (24) and each light-emitting layer (25).

10. A display device, characterized in that: The invention comprises a display panel as claimed in any one of claims 1 to 9.

Images