Display panel and manufacturing method thereof, and electronic device

Abstract

The present invention proposes a display panel and a manufacturing method thereof, and an electronic device, wherein the display panel includes an array substrate; a color resist layer on the array substrate; a light-emitting device layer on the color resist layer; and a reflective layer between the color resist layer and the array substrate, wherein the reflective layer is used to reflect the light emitted by the light-emitting device layer. The present invention provides a reflective layer between the color resist layer and the array substrate, so that the display panel forms a top-emitting white light display, eliminates the position restriction of the opening area in the pixel, improves the opening ratio of the display panel, and increases the area of ​​the light-emitting area; in addition, part of the white light directly enters the human eye, thereby improving the light-emitting efficiency of the display panel and reducing the power consumption of the electronic device.

Description

Technical Field

[0001] The present invention relates to the field of display, and in particular to a display panel and a manufacturing method thereof, and an electronic device. Background Art

[0002] In flat panel display technology, Organic Light-Emitting Diode (OLED) displays have many advantages such as light weight, active light emission, fast response speed, large viewing angle, wide color gamut, high brightness and low power consumption, and have gradually become the third generation display technology after liquid crystal displays.

[0003] The color filter layer of the existing white light OLED display panel is located between the insulating layer and the flat layer on the source and drain layer, and the anode layer, the light-emitting layer and the cathode layer of the light-emitting device layer are located between the flat layer and the pixel defining layer. Based on this structure, the existing white light OLED display panel is generally a bottom-emitting display, that is, the light emitted by the light-emitting layer is emitted through the substrate to reach the human eye; therefore, in order to maximize the use of the light emitted by the light-emitting layer, the light-emitting layer restricted by the pixel defining layer can only be set between each TFT (thin film transistor), and cannot be located on the TFT, which limits the aperture ratio of the existing white light OLED display panel or the size of the light-emitting area in each pixel.

[0004] Therefore, there is an urgent need for a display panel to solve the above problems. Summary of the invention

[0005] The present invention provides a display panel and a manufacturing method thereof, and an electronic device to solve the technical problem that the aperture ratio of the existing OLED display panel is relatively small.

[0006] To solve the above problems, the technical solution provided by the present invention is as follows:

[0007] The present invention provides a display panel, comprising:

[0008] An array substrate;

[0009] A color resist layer located on the array substrate;

[0010] a light emitting device layer located on the color resist layer; and

[0011] A reflective layer is located between the color resist layer and the array substrate, and is used to reflect the light emitted by the light emitting device layer.

[0012] In the display panel of the present invention, the light emitting device layer includes an anode layer, a light emitting layer located on the anode layer, and a cathode layer located on the light emitting layer;

[0013] Wherein, the anode layer is a transparent electrode, and the cathode layer is a transparent electrode or a semi-transparent electrode.

[0014] In the display panel of the present invention, the reflective layer includes at least two reflective units, and the reflective units correspond one-to-one to the light-emitting units in the light-emitting layer.

[0015] In the display panel of the present invention, the orthographic projection of the light-emitting layer on the reflective layer is located inside the reflective layer.

[0016] In the display panel of the present invention, the reflection unit includes a first surface and a second surface, and the first surface is a concave surface away from the array substrate.

[0017] The present invention provides a method for manufacturing a display panel, comprising:

[0018] Providing an array substrate;

[0019] forming a color resist layer on the array substrate;

[0020] sequentially forming a light-emitting device layer on the color resist layer;

[0021] Wherein, before forming the color resist layer on the array substrate, the method further includes:

[0022] A reflective layer is formed on the array substrate.

[0023] In the manufacturing method of the present invention, the reflective layer includes at least two reflective units, and the reflective units correspond one-to-one to the light-emitting units in the light-emitting device layer.

[0024] In the manufacturing method of the present invention, the orthographic projection of the light-emitting layer on the reflective layer is located inside the reflective layer.

[0025] In the manufacturing method of the present invention, the reflection unit includes a first surface and a second surface, and the first surface is a concave surface away from the array substrate.

[0026] The present invention further provides an electronic device, wherein the electronic device comprises the above-mentioned display panel.

[0027] Beneficial effects: The present invention sets a reflective layer between the color resist layer and the array substrate, so that the display panel forms a top-emitting white light display, eliminates the restriction on the position of the opening area in the pixel, improves the aperture ratio of the display panel, and increases the area of ​​the light-emitting region; in addition, part of the white light directly enters the human eye, which improves the luminous efficiency of the display panel and reduces the power consumption of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a film layer structure diagram of a display panel according to an embodiment of the present invention;

[0030] Figure 2 This is a film layer structure diagram of a display panel according to a second embodiment of the present invention;

[0031] Figure 3 This is a film layer structure diagram of a display panel according to a third embodiment of the present invention;

[0032] Figure 4 A step diagram of a method for manufacturing a display panel according to the present invention;

[0033] Figure 5 A process flow chart of a method for manufacturing a display panel according to the present invention;

[0034] Figure 6 Another process flow chart of a display panel manufacturing method of the present invention. DETAILED DESCRIPTION

[0035] The following descriptions of the embodiments are made with reference to the attached drawings to illustrate specific embodiments in which the present invention may be implemented. The directional terms mentioned in the present invention, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In the drawings, units with similar structures are represented by the same reference numerals.

[0036] Figure 1 The figure shows a film layer structure diagram of a display panel according to an embodiment of the present invention. The display panel includes an array substrate, a color resist layer 103 located on the array substrate, and a light emitting device layer located on the color resist layer 103;

[0037] The array substrate includes a substrate 101 and a thin film transistor layer 102 located on the substrate 101 ; wherein the raw material of the substrate 101 can be one of a glass substrate, a quartz substrate, a resin substrate and the like.

[0038] The thin film transistor layer 102 includes an ESL (etching barrier layer), BCE (back channel etching) or Top-gate (top gate thin film transistor) structure, with no specific restrictions; for example, the top gate thin film transistor type includes: a buffer layer, an active layer, a gate insulation layer, a gate layer, an inter-insulating layer, a source and drain layer, and a planarization layer.

[0039] The color resist layer 103 includes at least two color resist units, and the color resist units include one of a red color resist block, a green color resist block, and a blue color resist block. Each of the color resist units corresponds to a light-emitting unit in the light-emitting device.

[0040] The light emitting device layer comprises an anode layer 109, a light emitting layer 110 located on the anode layer 109, and a cathode layer 111 located on the light emitting layer 110;

[0041] The anode layer 109 is formed on the flat layer, and the anode layer 109 includes at least two anodes arranged in an array. The anode layer 109 is mainly used to provide holes for absorbing electrons;

[0042] The light-emitting layer 110 is formed on the anode layer 109. The light-emitting layer 110 is divided into a plurality of light-emitting units by the pixel definition layer 112. Each light-emitting unit corresponds to one anode. The holes generated by the anode layer 109 absorb the cathode layer 111 to generate electrons, and a light source is generated in the light-emitting layer 110.

[0043] The cathode layer 111 is formed on the light emitting device layer, and the cathode layer 111 covers the light emitting layer 110 and the pixel definition layer 112 located on the array substrate.

[0044] In addition, the display panel further includes a reflective layer 106 located between the color resist layer 103 and the array substrate, and the reflective layer 106 is used to reflect the light emitted by the light-emitting device layer; the material of the reflective layer 106 can be selected from one of silver (Ag), aluminum (Al), chromium (Cr), molybdenum (Mo), tungsten (W), titanium (Ti), gold (Au), palladium (Pd), or a combination of more than one thereof;

[0045] In this embodiment, since the display panel is a top-emitting OLED display device, the anode layer 109 is a transparent metal electrode, and the cathode layer 111 is a transparent or semi-transparent metal electrode;

[0046] Preferably, the material of the anode layer 109 may be selected from at least one of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO) or aluminum zinc oxide (AZO); the material of the cathode layer 111 may be selected from at least one of magnesium (Mg), calcium (Ca), aluminum (Al) or silver (Ag).

[0047] It can be understood that after the light emitted by the light emitting layer 110 passes through the anode layer 109, it enters the color resist layer 103 and reflects the light of the corresponding color resist color, and then passes through the anode layer 109 and the cathode layer 111 again to enter the human eye;

[0048] In addition, since only a part of the light emitted by the light-emitting layer 110 passes through the reflective layer 106, the other part of the light source directly passes through the cathode layer 111 and enters the human eye. This part of the light source is white light that has not passed through the color filter film; therefore, the light emitted by each pixel unit is a superposition of white light and light filtered by the corresponding color resistance, thereby realizing RGBW display.

[0049] like Figure 1 As shown, the reflective layer 106 includes at least two reflective units, and the reflective units correspond one-to-one to the light-emitting units in the light-emitting layer 110 ; in this embodiment, the orthographic projection of the light-emitting layer 110 on the reflective layer 106 is located inside the reflective layer 106 .

[0050] Further, such as Figure 2 As shown, the reflective layer 106 is disposed as a whole layer on the array substrate; it is understandable that since there is metal in the connecting vias between the anode layer 109 and the source and drain electrodes, the reflective layer needs to be disposed away from the vias to prevent a short circuit in the circuit; since the light source emitted by the light-emitting unit is non-directional, the provision of the reflective layer 106 in this embodiment improves the luminous efficiency of the light-emitting device.

[0051] Further, such as Figure 3 As shown, the reflecting unit 106 includes a first surface, which is a concave surface away from the array substrate; it can be understood that the reflecting layer 106 is set into a groove using the principle of a concave lens, so that a larger proportion of the emitted light passes vertically through the cathode layer 111, thereby improving the luminous efficiency of the light-emitting device.

[0052] It can be understood that the present invention sets a reflective layer between the color resist layer and the array substrate so that the display panel forms a top-emitting white light display, that is, the colored light that passes through the color resist layer and the white light that does not pass through the color resist layer; wherein the proportion of white light in the total brightness can be adjusted by changing the transmittance of the cathode layer, such as the material or thickness of the cathode layer, thereby adjusting the gain of the white light on the RGB color brightness and the effect of the color; and the top-emitting white light display eliminates the limitation of the position of the opening area in the pixel, improves the aperture ratio of the display panel, and increases the area of ​​the light-emitting area; part of the white light directly enters the human eye, thereby improving the luminous efficiency of the display panel and reducing the power consumption of the electronic device.

[0053] Figure 4 The present invention provides a method for manufacturing a display panel, comprising the steps of:

[0054] S10, providing an array substrate;

[0055] like Figure 5 As shown, in this step, the array substrate provided includes a substrate 101 and a thin film transistor layer 102 located on the substrate 101; wherein the raw material of the substrate 101 can be one of a glass substrate, a quartz substrate, a resin substrate, and the like.

[0056] The thin film transistor layer 102 includes an ESL (etching barrier layer), BCE (back channel etching) or Top-gate (top gate thin film transistor) structure, with no specific restrictions; for example, the top gate thin film transistor type includes: a buffer layer, an active layer, a gate insulation layer, a gate layer, an inter-insulating layer, a source and drain layer, and a planarization layer.

[0057] S20, forming a reflective layer on the array substrate;

[0058] like Figure 6 As shown, in this step, the reflective layer 106 can be formed by deposition or metal sputtering, that is, forming Figure 1 The structure shown; wherein the reflective layer 106 is used to reflect the light emitted by the light-emitting device layer; preferably, the material of the reflective layer 106 can be selected from one or a combination of more than one of silver (Ag), aluminum (Al), chromium (Cr), molybdenum (Mo), tungsten (W), titanium (Ti), gold (Au), and palladium (Pd).

[0059] S30, forming a color resist layer on the array substrate;

[0060] like Figure 6As shown, in this step, the color resist layer 103 can be prepared by dyeing, printing, electroplating, inkjet and other processes; wherein, the color resist layer 103 includes at least two color resist units, and the color resist unit includes one of a red color resist block, a green color resist block and a blue color resist block, and each of the color resist units corresponds to a light-emitting unit in a light-emitting device.

[0061] S40, sequentially forming a light-emitting device layer on the color resist layer;

[0062] In this step, the light emitting device layer includes an anode layer 109, a light emitting layer 110 located on the anode layer 109, and a cathode layer 111 located on the light emitting layer 110, thereby forming a Figure 1 As shown;

[0063] The anode layer 109 is formed on the flat layer 108. The anode layer 109 includes at least two anodes arranged in an array. The anode layer 109 is mainly used to provide holes for absorbing electrons.

[0064] The light-emitting layer 110 is formed on the anode layer 109. The light-emitting layer 110 is divided into a plurality of light-emitting units by the pixel definition layer 112. Each light-emitting unit corresponds to one anode. The holes generated by the anode layer 109 absorb the cathode layer 111 to generate electrons, and a light source is generated in the light-emitting layer 110.

[0065] The cathode layer 111 is formed on the light emitting device layer, and the cathode layer 111 covers the light emitting layer 110 and the pixel definition layer 112 located on the array substrate;

[0066] In this embodiment, since the display panel is a top-emitting OLED display device, the anode layer 109 is a transparent metal electrode, and the cathode layer 111 is a transparent or semi-transparent metal electrode;

[0067] Preferably, the material of the anode layer 109 may be selected from at least one of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO) or aluminum zinc oxide (AZO); the material of the cathode layer 111 may be selected from at least one of magnesium (Mg), calcium (Ca), aluminum (Al) or silver (Ag).

[0068] Understandable, such as Figure 1 As shown, the reflective layer 106 includes at least two reflective units, and the reflective units correspond one-to-one to the light-emitting units in the light-emitting layer 110 ; the orthographic projection of the light-emitting layer 110 on the reflective layer 106 is located inside the reflective layer 106 .

[0069] Further, such as Figure 2 As shown, the reflective layer 106 is disposed on the array substrate as a whole layer; since the light source emitted by the light-emitting unit is non-directional, the provision of the reflective layer 106 in this embodiment improves the light-emitting efficiency of the light-emitting device.

[0070] Further, such as Figure 3 As shown, the reflective unit includes a first surface, which is a concave surface away from the array substrate; it can be understood that the reflective layer 106 is set into a groove using the principle of a concave lens, so that a larger proportion of the emitted light passes vertically through the cathode layer 111, thereby improving the luminous efficiency of the light-emitting device.

[0071] The present invention also provides an electronic device, which includes the above-mentioned display panel. It is understandable that the electronic device includes but is not limited to mobile phones, tablet computers, computer monitors, game consoles, televisions, display screens, wearable devices and other life appliances or household appliances with display functions.

[0072] The present invention proposes a display panel and a manufacturing method thereof, and an electronic device, wherein the display panel includes an array substrate; a color resist layer on the array substrate; a light-emitting device layer on the color resist layer; and a reflective layer between the color resist layer and the array substrate, wherein the reflective layer is used to reflect the light emitted by the light-emitting device layer. The present invention provides a reflective layer between the color resist layer and the array substrate, so that the display panel forms a top-emitting white light display, eliminates the position restriction of the opening area in the pixel, improves the aperture ratio of the display panel, and increases the area of ​​the light-emitting area; in addition, part of the white light directly enters the human eye, thereby improving the light-emitting efficiency of the display panel and reducing the power consumption of the electronic device.

[0073] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A display panel, characterized in that: include: An array substrate; The color resist layer located on the array substrate includes at least two color resist units; A light-emitting device layer located on the color-resistance layer, the light-emitting device layer comprising an anode layer, a light-emitting layer located on the anode layer, and a cathode layer located on the light-emitting layer, the light-emitting layer comprising a plurality of light-emitting units, one light-emitting unit corresponding to one color-resistance unit; as well as a reflective layer located between the color resist layer and the array substrate, the reflective layer being used to reflect the light emitted by the light emitting device layer; Among them, the cathode layer is laid as a whole layer and covers the light-emitting layer and the pixel definition layer located on the array substrate, the anode layer is a transparent electrode, the cathode layer is a semi-transparent electrode, the proportion of white light in the light emitted by the display panel is positively correlated with the transmittance of the cathode layer, and the transmittance of the cathode layer is related to the thickness of the cathode layer.

2. The display panel according to claim 1, characterized in that: The reflective layer includes at least two reflective units, and the reflective units correspond to the light-emitting units in the light-emitting layer one by one.

3. The display panel according to claim 2, characterized in that: The orthographic projection of the light-emitting layer on the reflective layer is located within the reflective layer.

4. The display panel according to claim 2, characterized in that: The reflection unit includes a first surface, and the first surface is a concave surface away from the array substrate.

5. A method for manufacturing a display panel, characterized in that: include: Providing an array substrate; forming a color resist layer on the array substrate, comprising at least two color resist units; A light-emitting device layer is sequentially formed on the color-resist layer, wherein the light-emitting device layer includes an anode layer, a light-emitting layer located on the anode layer, and a cathode layer located on the light-emitting layer, wherein the light-emitting layer includes a plurality of light-emitting units, and one light-emitting unit corresponds to one color-resist unit; Wherein, before forming the color resist layer on the array substrate, the method further includes: forming a reflective layer on the array substrate, wherein the reflective layer is used to reflect the light emitted by the light emitting device layer; Among them, the cathode layer is laid as a whole layer and covers the light-emitting layer and the pixel definition layer located on the array substrate, the anode layer is a transparent electrode, the cathode layer is a semi-transparent electrode, the proportion of white light in the light emitted by the display panel is positively correlated with the transmittance of the cathode layer, and the transmittance of the cathode layer is related to the thickness of the cathode layer.

6. The method for manufacturing a display panel according to claim 5, characterized in that: The reflective layer includes at least two reflective units, and the reflective units correspond one-to-one to the light-emitting units in the light-emitting device layer.

7. The method for manufacturing a display panel according to claim 6, characterized in that: The orthographic projection of the light-emitting layer on the reflective layer is located within the reflective layer.

8. The method for manufacturing a display panel according to claim 6, characterized in that: The reflection unit includes a first surface, and the first surface is a concave surface away from the array substrate.

9. An electronic device, characterized in that: The electronic device comprises the display panel according to any one of claims 1 to 4.

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