CN113725268A - OLED display panel and display terminal - Google Patents

OLED display panel and display terminal Download PDF

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Publication number
CN113725268A
CN113725268A CN202110981135.0A CN202110981135A CN113725268A CN 113725268 A CN113725268 A CN 113725268A CN 202110981135 A CN202110981135 A CN 202110981135A CN 113725268 A CN113725268 A CN 113725268A
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light emitting
color
light
emitting unit
display panel
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CN202110981135.0A
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CN113725268B (en
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余海军
何坤
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Sustainable Development (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention provides an OLED display panel and a display terminal; the OLED display panel comprises a plurality of first through holes corresponding to light emitting areas and a plurality of second through holes positioned in non-light emitting areas; any first light-emitting unit in the OLED display panel is arranged in the first through hole, a photoresistor is arranged in a second through hole adjacent to the first light-emitting unit, one end of the photoresistor is electrically connected with the pixel electrode, and the other end of the photoresistor is electrically connected with the common electrode layer; according to the invention, the photoresistor communicated with the pixel electrode and the common electrode layer is arranged in the second through hole, the photoresistor and the first light-emitting unit form a parallel circuit, and when the first light-emitting unit is brighter, the resistance value of the photoresistor is small and shunts for the first light-emitting unit; when the first light-emitting unit is darker, the resistance of the photosensitive resistor is large, which is equivalent to open circuit, and the brightness uniformity of the OLED display panel can be remarkably improved through self-adjustment of the resistance of the photosensitive resistor, so that the display effect is improved.

Description

OLED display panel and display terminal
Technical Field
The invention relates to the technical field of display, in particular to an OLED display panel and a display terminal.
Background
Compared with the traditional TFT-LCD (Thin Film Transistor Liquid Crystal Display) technology, the OLED (Organic Light Emitting Diode) Display technology has the advantages of high color gamut, wide viewing angle, quick response, capability of being made into a flexible device and the like, and can be applied to the fields of wearable equipment (such as intelligent bracelets, intelligent watches, VR (Virtual Reality) equipment), mobile phones, electronic books, electronic newspapers, televisions, personal portable computers and the like. With the maturity of OLED display technology, the share of the OLED display panel occupying the display market is increasing, and particularly, the OLED display panel has made a great development in the mobile phone panel market. The common light emitting structure of the OLED display panel is: forming a Pixel electrode pattern, forming a PDL (Pixel Definition Layer), and finally evaporating or printing an organic light emitting material in a light emitting region defined by the Pixel Definition Layer.
The display principle of the OLED display panel is to control the display screen of the OLED display panel by controlling the current flowing through each pixel through the TFT circuit, but the luminance of the effective light emitting area of the OLED display panel is always different due to the electrical dispersion of the TFTs, that is, the uniformity of the luminance and chromaticity of the OLED display panel is poor. Therefore, it is necessary to improve this defect.
Disclosure of Invention
The embodiment of the invention provides an OLED display panel, which is used for solving the technical problem that the uniformity of the brightness and the chromaticity of the OLED display panel in the prior art is poor.
The embodiment of the invention provides an OLED display panel, which comprises a luminous area and a non-luminous area, wherein the luminous area and the non-luminous area comprise a pixel electrode layer, a pixel definition layer, an organic luminous layer and a common electrode layer; the pixel electrode layer comprises a plurality of pixel electrodes distributed in an array; the pixel defining layer is positioned above the pixel electrode layer and comprises a plurality of first through holes corresponding to the light emitting areas and a plurality of second through holes positioned in the non-light emitting areas; the organic light-emitting layer comprises a plurality of first light-emitting units, and any first light-emitting unit is arranged in the first through hole; the common electrode layer is positioned above the pixel defining layer and the organic light emitting layer; and a photoresistor is arranged in the second through hole adjacent to the first light-emitting unit, one end of the photoresistor is electrically connected with the pixel electrode, and the other end of the photoresistor is electrically connected with the common electrode layer.
In the OLED display panel provided in the embodiment of the present invention, a first color resistor is disposed on an inner wall of the second through hole adjacent to the first light emitting unit, and a color of the first color resistor is the same as a light emitting color of the first light emitting unit.
In the OLED display panel provided in the embodiment of the present invention, orthographic projections of the photo resistors and the first color resistors located in the same second through hole on the inner wall of the second through hole are overlapped.
In the OLED display panel provided in the embodiment of the present invention, the organic light emitting layer further includes a plurality of second light emitting units, and any one of the second light emitting units is disposed in the first through hole; the second through hole adjacent to the second light-emitting unit is internally provided with the photoresistor; and a second color resistor is arranged on the inner wall of the second through hole adjacent to the second light-emitting unit, and the color of the second color resistor is the same as the light-emitting color of the second light-emitting unit.
In the OLED display panel provided in the embodiment of the present invention, the organic light emitting layer further includes a plurality of third light emitting units, and any one of the third light emitting units is disposed in the first through hole; the second through hole adjacent to the third light-emitting unit is internally provided with the photoresistor; and a third color resistor is arranged on the inner wall of the second through hole adjacent to the third light-emitting unit, and the color of the third color resistor is the same as the light-emitting color of the third light-emitting unit.
In the OLED display panel provided in the embodiment of the present invention, the light emitting colors of the first light emitting unit, the second light emitting unit, and the third light emitting unit are respectively different from one another among red, green, and blue.
In the OLED display panel according to the embodiment of the present invention, in a direction from the photo resistor to the color resistor, a thickness of the color resistor corresponding to green is greater than a thickness of the color resistor corresponding to red, and a thickness of the color resistor corresponding to red is greater than a thickness of the color resistor corresponding to blue.
In the OLED display panel provided in the embodiment of the present invention, the material of the photo resistor is one or more of cadmium sulfide, selenium, aluminum sulfide, lead sulfide, and bismuth sulfide.
In the OLED display panel provided in the embodiment of the present invention, the resistance of the photo resistor is greater than 0 and less than or equal to 1.5 megaohms.
The embodiment of the invention also provides a display terminal which comprises a terminal main body and the OLED display panel, wherein the terminal main body and the OLED display panel are combined into a whole.
Has the advantages that: the OLED display panel provided by the embodiment of the invention comprises a pixel electrode layer, a pixel definition layer, an organic light emitting layer and a common electrode layer; the pixel electrode layer comprises a plurality of pixel electrodes distributed in an array; the pixel defining layer is positioned on the pixel electrode layer and comprises a plurality of first through holes corresponding to the light emitting areas and a plurality of second through holes positioned in the non-light emitting areas; the organic light-emitting layer comprises a plurality of first light-emitting units, and any first light-emitting unit is arranged in the first through hole; and a photoresistor is arranged in the second through hole adjacent to the first light-emitting unit, one end of the photoresistor is electrically connected with the pixel electrode, and the other end of the photoresistor is electrically connected with the common electrode layer. The photoresistor is arranged in the second through hole of the pixel defining layer, the pixel electrode and the common electrode layer are communicated, and the photoresistor and the first light-emitting unit form a parallel circuit, wherein the resistance value of the photoresistor can be self-adjusted according to different brightness; when the first light-emitting unit is dark, the resistance of the photosensitive resistor is large, namely, the circuit is broken, the brightness uniformity, the chromaticity uniformity and the color accuracy of the OLED display panel can be remarkably improved through self-adjustment of the resistance of the photosensitive resistor, and the display effect is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
Fig. 1 is a schematic diagram of a basic structure of an OLED display panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a basic structure of another OLED display panel according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a basic structure of another OLED display panel according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the size and thickness of components illustrated in the drawings are not to scale for clarity and ease of understanding and description.
As shown in fig. 1, a basic structure of an OLED display panel provided in an embodiment of the present invention is schematically illustrated, where the OLED display panel includes a light-emitting region a1 and a non-light-emitting region a2, and includes a pixel electrode layer 10, a pixel defining layer 20, an organic light-emitting layer 30, and a common electrode layer 40; the pixel electrode layer 10 comprises a plurality of pixel electrodes 101 distributed in an array; the pixel defining layer 20 is positioned on the pixel electrode layer 10, and includes a plurality of first vias 201 corresponding to the light emitting regions a1 and a plurality of second vias 202 positioned in the non-light emitting regions a 2; the organic light emitting layer 30 includes a plurality of first light emitting units 301, and any one of the first light emitting units 301 is disposed in the first through hole 201; the common electrode layer 40 is positioned on the pixel defining layer 20 and the organic light emitting layer 30; a photoresistor 50 is disposed in the second through hole 202 adjacent to the first light emitting unit 301, one end of the photoresistor 50 is electrically connected to the pixel electrode 101, and the other end of the photoresistor 50 is electrically connected to the common electrode layer 40.
It should be noted that, in the present embodiment, the plurality of second through holes 202 are respectively disposed in one-to-one correspondence with the plurality of first light emitting units 301, and in the present embodiment, the photoresistors 50 are disposed in the second through holes 202 to communicate the pixel electrodes 101 and the common electrode layer 40, and one adjacent first light emitting unit 301 and one adjacent photoresistor 50 share one pixel electrode 101 and the common electrode layer 40, that is, 2 parallel circuits are formed by one adjacent photoresistor 50 and one first light emitting unit 301. The resistance of the photo-resistor 50 can be self-adjusted according to the brightness of the first light-emitting unit 301, and when the brightness of the first light-emitting unit 301 is brighter, the resistance of the adjacent photo-resistor 50 is small, so that the current can be shunted to the first light-emitting unit 301; when the brightness of the first light-emitting unit 301 is relatively dark, the resistance of the adjacent photosensitive resistor 50 is large, which is equivalent to open circuit, and through self-adjustment of the resistance of the photosensitive resistor 50, the brightness uniformity of the plurality of first light-emitting units 301 can be improved, the brightness uniformity, the chromaticity uniformity and the color accuracy of the OLED display panel can be remarkably improved, and the display effect is improved.
In other embodiments, one photo-resistor 50 (not shown) may be disposed on each of the left and right sides of one first light emitting unit 301, so that 3 parallel circuits may be formed to further improve the brightness uniformity of the first light emitting unit 301.
It should be noted that the OLED display panel further includes a flexible substrate (not shown) located on a side of the pixel electrode layer 10 away from the pixel defining layer 20, and a driving circuit layer (not shown) located between the flexible substrate and the pixel electrode layer 10; the driving circuit layer includes a buffer layer on the flexible substrate, an active layer on the buffer layer, a gate insulating layer on the active layer, a gate layer on the gate insulating layer, an interlayer insulating layer on the gate layer, and source/drain metal layers on the interlayer insulating layer. The pixel electrode 101 is electrically connected to the source, and the potential of the pixel electrode 101 is controlled by controlling the potential of the source.
In one embodiment, a first color resistor 601 is disposed on an inner wall of the second through hole 202 adjacent to the first light emitting unit 301, and a color of the first color resistor 601 is the same as a light emitting color of the first light emitting unit 301. It should be noted that, since the first color resistor 601 is disposed around the photo-resistor 50, only the first color resistor 601 is shown in fig. 1, and the photo-resistor 50 is hidden in the first color resistor 601. It can be understood that the resistance value of the photo resistor 50 can be changed only when the light of the corresponding color can pass through the corresponding color resistor, in this embodiment, the first color resistor 601 is disposed at the periphery of the photo resistor 50, and the color of the first color resistor 601 is the same as the color of the light emitted from the first light emitting unit 301, so that only the light emitted from the first light emitting unit 301 can pass through the first color resistor 601 and be received by the photo resistor 50, the light emitted from the other second light emitting unit 302 and the third light emitting unit 303 cannot pass through the first color resistor 601 and cannot be received by the photo resistor 50, the resistance value of the photo resistor 50 cannot be affected, the brightness uniformity of the first light emitting unit 301 can be more efficiently adjusted and controlled, and the display uniformity of the OLED display panel is improved.
In one embodiment, the orthogonal projections of the photo-resistor 50 and the first color resistor 601 in the same second via 202 on the inner wall of the second via 202 are coincident. Wherein, the overlapping comprises two conditions, the first condition is complete overlapping, and the second condition is partial overlapping. When the orthogonal projections of the photo-resistor 50 and the first color resistor 601 located in the same second via 202 on the inner wall of the second via 202 are completely overlapped, the light received by the photo-resistor 50 is the light filtered by the first color resistor 601, and therefore, the resistance of the photo-resistor 50 is only affected by the first light-emitting unit 301. When the photo-resistor 50 and the first color resistor 601 located in the same second via 202 are overlapped on the orthographic projection part of the inner wall of the second via 202, a part of light received by the photo-resistor 50 comes from the first light emitting unit 301, and another part comes from the second light emitting unit 302 and the third light emitting unit 303, that is, the resistance value of the photo-resistor 50 is mainly influenced by the first light emitting unit 301, and is secondarily influenced by the second light emitting unit 302 and the third light emitting unit 303.
In one embodiment, the light emitting color of the first light emitting unit 301 is any one of red, green and blue.
In one embodiment, the material of the photoresistor 50 is one or more of cadmium sulfide, selenium, aluminum sulfide, lead sulfide, and bismuth sulfide.
In one embodiment, the resistance of the photo-resistor 50 is greater than 0 and less than or equal to 1.5 mega-ohms. The photosensitive wavelength of the photoresistor 50 is greater than or equal to 0.3 micrometer and less than or equal to 0.78 micrometer. In particular, the sensitivity of the photo-resistor 50 to light is close to the response of the human eye to visible light, which causes its resistance to change whenever light is sensed by the human eye.
Next, referring to fig. 2, a basic structure diagram of another OLED display panel according to an embodiment of the present invention is shown, where the OLED display panel includes a light-emitting area a1 and a non-light-emitting area a2, and includes a pixel electrode layer 10, a pixel defining layer 20, an organic light-emitting layer 30, and a common electrode layer 40; the pixel electrode layer 10 comprises a plurality of pixel electrodes 101 distributed in an array; the pixel defining layer 20 is positioned on the pixel electrode layer 10, and includes a plurality of first vias 201 corresponding to the light emitting regions a1 and a plurality of second vias 202 positioned in the non-light emitting regions a 2; the organic light emitting layer 30 includes a plurality of first light emitting units 301, and any one of the first light emitting units 301 is disposed in the first through hole 201; the common electrode layer 40 is positioned on the pixel defining layer 20 and the organic light emitting layer 30; a photoresistor 50 is disposed in the second through hole 202 adjacent to the first light emitting unit 301, one end of the photoresistor 50 is electrically connected to the pixel electrode 101, and the other end of the photoresistor 50 is electrically connected to the common electrode layer 40. A first color resistor 601 is disposed on an inner wall of the second through hole 202 adjacent to the first light emitting unit 301, and a color of the first color resistor 601 is the same as a light emitting color of the first light emitting unit 301.
In this embodiment, the organic light emitting layer 30 further includes a plurality of second light emitting units 302, and any one of the second light emitting units 302 is disposed in the first through hole 201; the second through hole 202 adjacent to the second light emitting unit 302 is provided with the photo-resistor 50 therein; a second color resistor 602 is disposed on an inner wall of the second through hole 202 adjacent to the second light emitting unit 302, and a color of the second color resistor 602 is the same as a light emitting color of the second light emitting unit 302.
It should be noted that, in the present embodiment, the plurality of second through holes 202 are respectively disposed in one-to-one correspondence with the plurality of first light emitting units 301 and the plurality of second light emitting units 302, and the plurality of second through holes 202 are all provided with the photo resistors 50 therein. It should be noted that, since the first color resistor 601 and the second color resistor 602 are disposed around the photo-sensor 50, only the first color resistor 601 and the second color resistor 602 are shown in fig. 2, and the photo-sensor 50 is hidden in the first color resistor 601 and the second color resistor 602.
It will be appreciated that the resistance of the photo-resistor 50 will only change if light of the corresponding color passes through the corresponding color resistor. In the embodiment, the first color resistor 601 and the second color resistor 602 are disposed at the periphery of the photosensitive resistor 50, and the color of the first color resistor 601 is the same as the color of the light emitted from the first light emitting unit 301, and the color of the second color resistor 602 is the same as the color of the light emitted from the second light emitting unit 302. Therefore, only the light emitted by the first light emitting unit 301 can pass through the first color resistor 601 and be received by the photo resistor 50, and the light emitted by the other second light emitting unit 302 and the third light emitting unit 303 cannot pass through the first color resistor 601 and cannot be received by the photo resistor 50, so that the resistance of the photo resistor 50 is not affected, and the brightness uniformity of the first light emitting unit 301 can be regulated and controlled more efficiently; only the light emitted by the second light emitting unit 302 can pass through the second color resistor 602 and thus be received by the photo resistor 50, the light emitted by the other first light emitting unit 301 and the third light emitting unit 303 cannot pass through the second color resistor 602 and cannot be received by the photo resistor 50, the resistance of the photo resistor 50 is not affected, the brightness uniformity of the second light emitting unit 302 can be regulated and controlled more efficiently, and the display uniformity of the OLED display panel is improved.
In one embodiment, the light emitting colors of the first light emitting unit 301 and the second light emitting unit 302 are two different colors of red, green and blue.
In one embodiment, the thickness of the first color resistor 601 is not equal to the thickness of the second color resistor 602 in the direction from the photosensitive resistor 50 to the color resistor. Specifically, if the light emitting intensity of the first light emitting unit 301 is greater than the light emitting intensity of the second light emitting unit 302, the thickness of the first color resistor 601 is greater than that of the second color resistor 602; if the light emitting intensity of the first light emitting unit 301 is smaller than the light emitting intensity of the second light emitting unit 302, the thickness of the first color resistor 601 is smaller than that of the second color resistor 602. It can be understood that the lower the light emission intensity, the smaller the thickness of the corresponding color resistor, and therefore the light transmittance is relatively increased, which makes up the defect of low light emission intensity, further balances the brightness uniformity of the first light emitting unit 301 and the second light emitting unit 302, and improves the display effect of the OLED display panel.
Next, referring to fig. 3, a basic structure diagram of another OLED display panel according to an embodiment of the present invention is shown, where the OLED display panel includes a light-emitting area a1 and a non-light-emitting area a2, and includes a pixel electrode layer 10, a pixel defining layer 20, an organic light-emitting layer 30, and a common electrode layer 40; the pixel electrode layer 10 comprises a plurality of pixel electrodes 101 distributed in an array; the pixel defining layer 20 is positioned on the pixel electrode layer 10, and includes a plurality of first vias 201 corresponding to the light emitting regions a1 and a plurality of second vias 202 positioned in the non-light emitting regions a 2; the organic light emitting layer 30 includes a plurality of first light emitting units 301, and any one of the first light emitting units 301 is disposed in the first through hole 201; the common electrode layer 40 is positioned on the pixel defining layer 20 and the organic light emitting layer 30; a photoresistor 50 is disposed in the second through hole 202 adjacent to the first light emitting unit 301, one end of the photoresistor 50 is electrically connected to the pixel electrode 101, and the other end of the photoresistor 50 is electrically connected to the common electrode layer 40. A first color resistor 601 is disposed on an inner wall of the second through hole 202 adjacent to the first light emitting unit 301, and a color of the first color resistor 601 is the same as a light emitting color of the first light emitting unit 301.
In this embodiment, the organic light emitting layer 30 further includes a plurality of second light emitting units 302, and any one of the second light emitting units 302 is disposed in the first through hole 201; the second through hole 202 adjacent to the second light emitting unit 302 is provided with the photo-resistor 50 therein; a second color resistor 602 is disposed on an inner wall of the second through hole 202 adjacent to the second light emitting unit 302, and a color of the second color resistor 602 is the same as a light emitting color of the second light emitting unit 302. The organic light emitting layer 30 further includes a plurality of third light emitting units 303, and any one of the third light emitting units 303 is disposed in the first through hole 201; the second through hole 202 adjacent to the third light emitting unit 303 is provided with the photo-resistor 50 therein; a third color resistor 603 is disposed on an inner wall of the second through hole 202 adjacent to the third light emitting unit 303, and a color of the third color resistor 603 is the same as a light emitting color of the third light emitting unit 303.
It should be noted that, in the present embodiment, the plurality of second through holes 202 are respectively disposed in one-to-one correspondence with the plurality of first light emitting units 301, the plurality of second light emitting units 302, and the plurality of third light emitting units 303, and the plurality of second through holes 202 are all provided with the photo resistors 50 therein. It should be noted that, since the first color resistor 601, the second color resistor 602, and the third color resistor 603 are disposed around the photo-resistor 50, only the first color resistor 601, the second color resistor 602, and the third color resistor 603 are illustrated in fig. 3, and the photo-resistor 50 is hidden in the first color resistor 601, the second color resistor 602, and the third color resistor 603.
It will be appreciated that the resistance of the photo-resistor 50 will only change if light of the corresponding color passes through the corresponding color resistor. In this embodiment, the first color resistor 601, the second color resistor 602, and the third color resistor 603 are disposed on the periphery of the photo resistor 50, and the color of the first color resistor 601 is the same as the light emitting color of the first light emitting unit 301, the color of the second color resistor 602 is the same as the light emitting color of the second light emitting unit 302, and the color of the third color resistor 603 is the same as the light emitting color of the third light emitting unit 303. Therefore, only the light emitted by the first light emitting unit 301 can pass through the first color resistor 601 and be received by the photo resistor 50, and the light emitted by the other second light emitting unit 302 and the third light emitting unit 303 cannot pass through the first color resistor 601 and cannot be received by the photo resistor 50, so that the resistance of the photo resistor 50 is not affected, and the brightness uniformity of the first light emitting unit 301 can be regulated and controlled more efficiently; only the light emitted by the second light emitting unit 302 can pass through the second color resistor 602 and thus be received by the photo resistor 50, and the light emitted by the other first light emitting unit 301 and the third light emitting unit 303 cannot pass through the second color resistor 602 and cannot be received by the photo resistor 50, so that the resistance of the photo resistor 50 is not affected, and the brightness uniformity of the second light emitting unit 302 can be regulated and controlled more efficiently; only the light emitted by the third light emitting unit 303 can pass through the third color resistor 603 and be received by the photo resistor 50, and the light emitted by the other first light emitting unit 301 and the second light emitting unit 302 cannot pass through the third color resistor 603 and cannot be received by the photo resistor 50, so that the resistance of the photo resistor 50 is not affected, the brightness uniformity of the third light emitting unit 303 can be more efficiently regulated, and the display uniformity of the OLED display panel is improved.
In one embodiment, the light emitting colors of the first light emitting unit 301, the second light emitting unit 302 and the third light emitting unit 303 are different from each other, i.e., red, green and blue. In the direction from the light dependent resistor 50 to the color resistors, the thickness of the color resistor corresponding to green is greater than the thickness of the color resistor corresponding to red, and the thickness of the color resistor corresponding to red is greater than the thickness of the color resistor corresponding to blue. It is understood that the emission intensity of green light (about 69%) is greater than the emission intensity of red light (about 21%), which is greater than the emission intensity of blue light (about 10%). That is, the thickness of the color resistor corresponding to the lower light emission intensity is smaller, so that the light transmittance is relatively increased, the defect of low light emission intensity is overcome, the brightness uniformity of the first light emitting unit 301, the second light emitting unit 302 and the third light emitting unit 303 is further balanced, and the display effect of the OLED display panel is improved.
The embodiment of the invention also provides a display terminal which comprises a terminal main body and the OLED display panel, wherein the terminal main body and the OLED display panel are combined into a whole. Please refer to fig. 1 to fig. 3 and related descriptions, which are not repeated herein. The display terminal provided by the embodiment of the invention can be as follows: products or components with display functions such as mobile phones, tablet computers, notebook computers, digital cameras, navigators and the like.
In summary, the OLED display panel provided in the embodiments of the present invention includes a pixel electrode layer, a pixel defining layer, an organic light emitting layer, and a common electrode layer; the pixel electrode layer comprises a plurality of pixel electrodes distributed in an array; the pixel defining layer is positioned on the pixel electrode layer and comprises a plurality of first through holes corresponding to the light emitting areas and a plurality of second through holes positioned in the non-light emitting areas; the organic light-emitting layer comprises a plurality of first light-emitting units, and any first light-emitting unit is arranged in the first through hole; and a photoresistor is arranged in the second through hole adjacent to the first light-emitting unit, one end of the photoresistor is electrically connected with the pixel electrode, and the other end of the photoresistor is electrically connected with the common electrode layer. The photoresistor is arranged in the second through hole of the pixel defining layer, the pixel electrode and the common electrode layer are communicated, and the photoresistor and the first light-emitting unit form a parallel circuit, wherein the resistance value of the photoresistor can be self-adjusted according to different brightness; when first luminescence unit is darker, the resistance of photo resistance is big, is equivalent to open circuit, through the self-regulation of photo resistance, can show luminance homogeneity, colourity homogeneity and the color accuracy that improves OLED display panel, promotes the display effect, has solved the relatively poor technical problem of prior art OLED display panel's luminance and colourity homogeneity.
The OLED display panel and the display terminal provided in the embodiments of the present invention are described in detail above. It should be understood that the exemplary embodiments described herein should be considered merely illustrative for facilitating understanding of the method of the present invention and its core ideas, and not restrictive.

Claims (10)

1. An OLED display panel including light-emitting regions and non-light-emitting regions, comprising:
the pixel electrode layer comprises a plurality of pixel electrodes distributed in an array;
the pixel defining layer is positioned on the pixel electrode layer and comprises a plurality of first through holes corresponding to the light emitting areas and a plurality of second through holes positioned in the non-light emitting areas;
an organic light emitting layer including a plurality of first light emitting units, any one of the first light emitting units being disposed in the first through hole;
a common electrode layer on the pixel defining layer and the organic light emitting layer;
and a photoresistor is arranged in the second through hole adjacent to the first light-emitting unit, one end of the photoresistor is electrically connected with the pixel electrode, and the other end of the photoresistor is electrically connected with the common electrode layer.
2. The OLED display panel of claim 1, wherein an inner wall of the second through hole adjacent to the first light emitting unit is provided with a first color resist, and a color of the first color resist is the same as a light emitting color of the first light emitting unit.
3. The OLED display panel claimed in claim 2, wherein the orthogonal projections of the photo resistors and the first color resistors located in the same second through hole on the inner wall of the second through hole are coincident.
4. The OLED display panel of claim 2, wherein the organic light emitting layer further includes a plurality of second light emitting units, any of the second light emitting units being disposed within the first via; the second through hole adjacent to the second light-emitting unit is internally provided with the photoresistor;
and a second color resistor is arranged on the inner wall of the second through hole adjacent to the second light-emitting unit, and the color of the second color resistor is the same as the light-emitting color of the second light-emitting unit.
5. The OLED display panel of claim 4, wherein the organic light emitting layer further comprises a plurality of third light emitting units, any of the third light emitting units being disposed within the first via; the second through hole adjacent to the third light-emitting unit is internally provided with the photoresistor;
and a third color resistor is arranged on the inner wall of the second through hole adjacent to the third light-emitting unit, and the color of the third color resistor is the same as the light-emitting color of the third light-emitting unit.
6. The OLED display panel of claim 5, wherein the first light emitting unit, the second light emitting unit and the third light emitting unit emit light with a color different from one of red, green and blue, respectively.
7. The OLED display panel of claim 6, wherein a thickness of the color resists corresponding to green is greater than a thickness of the color resists corresponding to red, and a thickness of the color resists corresponding to red is greater than a thickness of the color resists corresponding to blue in a direction from the photo-resistors to the color resists.
8. The OLED display panel of claim 1, wherein the material of the photo-resistor is one or more of cadmium sulfide, selenium, aluminum sulfide, lead sulfide, bismuth sulfide.
9. The OLED display panel of claim 1, wherein the photo-resistor has a resistance greater than 0 and less than or equal to 1.5 megaohms.
10. A display terminal comprising a terminal body and the OLED display panel according to any one of claims 1 to 9, the terminal body being integrated with the OLED display panel.
CN202110981135.0A 2021-08-25 2021-08-25 OLED display panel and display terminal Active CN113725268B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190064621A1 (en) * 2017-08-29 2019-02-28 Boe Technology Group Co., Ltd. Pixel circuit, pixel unit and display panel
CN110085762A (en) * 2019-04-15 2019-08-02 昆山工研院新型平板显示技术中心有限公司 OLED display panel and display device
CN112802882A (en) * 2021-02-05 2021-05-14 京东方科技集团股份有限公司 Display substrate and display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190064621A1 (en) * 2017-08-29 2019-02-28 Boe Technology Group Co., Ltd. Pixel circuit, pixel unit and display panel
CN110085762A (en) * 2019-04-15 2019-08-02 昆山工研院新型平板显示技术中心有限公司 OLED display panel and display device
CN112802882A (en) * 2021-02-05 2021-05-14 京东方科技集团股份有限公司 Display substrate and display device

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