CN112331141A - OLED display panel and display device - Google Patents
OLED display panel and display device Download PDFInfo
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- CN112331141A CN112331141A CN202011207355.XA CN202011207355A CN112331141A CN 112331141 A CN112331141 A CN 112331141A CN 202011207355 A CN202011207355 A CN 202011207355A CN 112331141 A CN112331141 A CN 112331141A
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- 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]
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- 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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- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
Abstract
The application provides an OLED display panel and display device, OLED display panel include the display area and surround the non-display area that the display area set up still includes: a plurality of light emitting devices arranged in an array in the display area; a pixel driving circuit for driving the light emitting device to emit light; the light sensor is arranged in the non-display area and used for converting a light intensity signal of ambient light into a first electric signal; the feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal; the display area comprises a first display area close to the optical sensor, and the pixel driving circuit corresponding to the light-emitting device in the first display area is also used for inputting a compensation signal to the corresponding light-emitting device so as to adjust the light-emitting brightness of the light-emitting device. The luminance of the light-emitting device close to the light sensor is compensated, so that the actual display luminance of the first display area changes along with the difference of the ambient light intensity, and the luminance of the watched picture is uniform.
Description
Technical Field
The application relates to the technical field of display, in particular to an OLED display panel and a display device.
Background
The existing large-size OLED display panel usually adopts a plurality of small-size display screens to be spliced to realize the display of an ultra-large screen, but as the technology is mature, a non-spliced ultra-large screen is gradually possible, but the space span of the large-size OLED display panel is large, the ambient light brightness of each area of the panel is different, so that the phenomenon of uneven image brightness of a viewer on the light sensitivity can be caused, and the viewing effect is influenced.
Therefore, the existing OLED display panel has the technical problem of uneven brightness of the viewed picture, and needs to be improved.
Disclosure of Invention
The embodiment of the application provides an OLED display panel and a display device, which are used for relieving the technical problem of uneven brightness of a viewed picture in the conventional OLED display panel.
The application provides an OLED display panel, including the display area with around the non-display area that the display area set up, OLED display panel includes:
a plurality of light emitting devices arranged in an array within the display area;
a pixel driving circuit for driving the light emitting device to emit light;
the light sensor is arranged in the non-display area and used for converting a light intensity signal of ambient light into a first electric signal;
the feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal;
the display area comprises a first display area close to the optical sensor, and the pixel driving circuit corresponding to the light-emitting device in the first display area is also used for inputting the compensation signal to the corresponding light-emitting device so as to adjust the light-emitting brightness of the light-emitting device.
In the OLED display panel of the present application, the pixel driving circuit is configured to input a first compensation signal to a corresponding light emitting device when a difference between the first electrical signal and the preset electrical signal is a positive value, so that the light emitting luminance of the light emitting device is reduced, and input a second compensation signal to the corresponding light emitting device when the difference between the first electrical signal and the preset electrical signal is a negative value, so that the light emitting luminance of the light emitting device is increased.
In the OLED display panel of this application, OLED display panel still includes amplifier circuit, amplifier circuit's input with light sensor connects, the output with feedback circuit connects, be used for with first signal of telecommunication is exported after enlargiing the preset times feedback circuit.
In the OLED display panel of the present application, the amplifying circuit includes a field effect transistor amplifier.
In the OLED display panel of this application, light sensor includes the metal oxide transistor on OLED display panel's the light-emitting direction, the metal oxide transistor is including light shield layer, buffer layer, metal oxide active layer, gate insulation layer, grid, interlayer insulation layer, source and the drain electrode of range upon range of setting in proper order, the gate material is transparent conducting material.
In the OLED display panel of the present application, the gate material includes at least one of indium tin oxide, indium zinc oxide, indium gallium zinc oxide, indium zinc tin oxide, indium gallium zinc tin oxide.
In the OLED display panel of the present application, the material of the gate insulating layer includes aluminum oxide.
In the OLED display panel of the present application, the light sensors are disposed at equal intervals in the non-display region.
In the OLED display panel of the present application, the pixel driving circuit includes:
the data signal input module is used for inputting a first data signal to a first point under the control of the control signal;
the driving module is connected with the data signal input module through the first point, is connected with the light-emitting device through the second point, and is used for driving the light-emitting device to emit light under the control of the first point potential and a power high potential signal;
the storage module is connected with the driving module through the first point and the second point and is used for storing the threshold voltage of the driving module;
and the compensation module is connected with the light-emitting device through the second point and is used for inputting the compensation signal to the light-emitting device under the control of the control signal so as to adjust the light-emitting brightness of the light-emitting device.
The application also provides a display device, which comprises an OLED display panel and a driving chip, wherein the OLED display panel is any one of the OLED display panels.
Has the advantages that: the application provides an OLED display panel and display device, OLED display panel include the display area and surround the non-display area that the display area set up still includes: a plurality of light emitting devices arranged in an array within the display area; a pixel driving circuit for driving the light emitting device to emit light; the light sensor is arranged in the non-display area and used for converting a light intensity signal of ambient light into a first electric signal; the feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal; the display area comprises a first display area close to the optical sensor, and the pixel driving circuit corresponding to the light-emitting device in the first display area is also used for inputting the compensation signal to the corresponding light-emitting device so as to adjust the light-emitting brightness of the light-emitting device. This application is through setting up light sensor at the non-display area, turns into first signal of telecommunication with the light intensity signal of ambient light to compensate the luminescent device luminance that is close to light sensor through feedback circuit and pixel drive circuit, make the actual display luminance of first display area also change thereupon along with ambient light intensity's difference, both cooperate each other and can make and watch the picture luminance even.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an OLED display panel provided in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a light sensor in an OLED display panel according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating electrical deviation of a light sensor in an OLED display panel according to an embodiment of the present disclosure under different illumination conditions.
Fig. 4 is a schematic structural diagram of a pixel driving circuit in a first display area of an OLED display panel according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the application provides an OLED display panel and a display device, which are used for relieving the technical problem of uneven brightness of a viewed picture in the conventional OLED display panel.
As shown in fig. 1, the present application provides an OLED display panel including a display area and a non-display area 20 disposed around the display area, the OLED display panel including a plurality of light emitting devices 100, a pixel driving circuit, a light sensor 30, and a feedback circuit; a plurality of light emitting devices 100 are arranged in an array in the display area; the pixel driving circuit is used for driving the light emitting device 100 to emit light; the light sensor 30 is disposed in the non-display area 20 and is configured to convert a light intensity signal of the ambient light into a first electrical signal; the feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal; wherein, the display area includes a first display area 11 near the light sensor 30, and the pixel driving circuit corresponding to the light emitting device 100 in the first display area 11 is further configured to input a compensation signal to the corresponding light emitting device 100 to adjust the light emitting brightness of the light emitting device 100.
The OLED display panel comprises a driving circuit layer and a light-emitting device layer, wherein a plurality of pixel driving circuits are formed in the driving circuit layer, each pixel driving circuit is composed of a plurality of transistors, a plurality of light-emitting devices 100 arranged in an array mode are formed in the light-emitting device layer, and each pixel driving circuit correspondingly drives one light-emitting device 100 to emit light.
In the non-display area 20, a light sensor 30 is disposed, and the light sensor 30 is used for converting a light intensity signal of the ambient light into a first electrical signal. As shown in fig. 2, the light sensor 30 includes a metal oxide transistor, and in the light emitting direction of the OLED display panel, the metal oxide transistor includes a substrate 201, a light shielding layer 202, a buffer layer 203, a metal oxide active layer 204, a gate insulating layer 205, a gate electrode 206, an interlayer insulating layer 207, a source electrode 208, and a drain electrode 209, which are stacked in sequence, the source electrode 208 is connected to a source region of the metal oxide active layer 204 through a first via, the drain electrode 209 is connected to a drain region of the metal oxide active layer 204 through a second via, and is connected to the light shielding layer 202 through a third via, the source electrode 208 and the drain electrode 209 are further formed on a planarization layer 210 and a pixel electrode 211, and the pixel electrode 211 is connected to the drain electrode 209 through a fourth via in the.
The metal oxide active layer 204 is made of a metal oxide semiconductor, and includes at least one of Indium Gallium Zinc Oxide (IGZO), Indium Tin Zinc Oxide (ITZO), and Indium Gallium Zinc Tin Oxide (IGZTO), which is sensitive to light intensity variation, and when external light irradiates the metal oxide active layer 204, a current between the source and the drain and a related electrical parameter vary, so that external light intensity can be detected according to the variation.
As shown in fig. 3, ABCDE in fig. 3 represents different degrees of electrical deviation of the light sensor 30 in the dark state, the ambient light state, the dark light state, the medium-intensity light state and the strong light state, respectively, and since the light sensor 30 is formed by using metal oxide transistors, the metal oxide transistors have the characteristic that the electrical characteristics deviate to different degrees under different illumination intensity conditions, the metal oxide transistors can be used for converting the light intensity signal of the ambient light into a first electrical signal, and the magnitude of the first electrical signal is used for representing the light intensity of the ambient light.
The gate material is a transparent conductive material, and includes at least one of Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Indium Gallium Zinc Oxide (IGZO), Indium Zinc Tin Oxide (IZTO), and Indium Gallium Zinc Tin Oxide (IGZTO), preferably Indium Zinc Oxide (IZO). The transparent conductive material adopted by the gate electrode can enable ambient light to more smoothly penetrate through and irradiate the metal oxide active layer 204, and the detection accuracy of external illumination is improved.
The gate insulating layer 205 is made of aluminum oxide, and this design can reduce the irreversible recombination of electrons and holes at the interface of the metal oxide active layer 204, the gate insulating layer 205 and the gate electrode 206, thereby eliminating the influence of the partial current on the sensing result, so that the measured current change is only generated by the irradiation of ambient light, and the detection accuracy is improved.
The pixel driving circuit is positioned in the display area, each pixel driving circuit also comprises a plurality of metal oxide transistors, and the difference between the transistors in the pixel driving circuit and the optical sensor 30 is that the grid electrode material of the transistors in the pixel driving circuit is an opaque metal material, so that the transistors in the pixel driving circuit and the optical sensor 30 can be synchronously formed, two processes are adopted for respectively forming only when the grid electrodes of the transistors and the optical sensor are prepared, and other processing steps are the same, so that the step of arranging the optical sensor 30 does not bring great change to the existing process, and the cost is lower.
The feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal. When a display picture is watched, the actually watched picture brightness is a comprehensive result of interaction between the display brightness of the OLED display panel and the brightness of ambient light, and when the ambient light is too bright or too dark, the actually watched picture brightness is affected, so that the actual viewing sense is not good. Therefore, when the ambient light is too bright, if the light emitting brightness of the light emitting device 100 on the OLED display panel is dimmed, the luminance of the actually viewed picture is reduced and dazzling is prevented by the cooperation of the two, and when the ambient light is too dark, if the light emitting brightness of the light emitting device 100 on the OLED display panel is dimmed, the luminance of the actually viewed picture is increased and unclear viewing is prevented by the cooperation of the two.
In the ultra-large-size OLED display panel, the brightness difference of ambient light is also large at two positions with a longer distance in the display area, and the actual viewing brightness of the two positions also has a larger difference under the same display brightness of the OLED display panel. Therefore, a preset electrical signal may be set first, after the light sensor 30 converts the light intensity signal of the ambient light into the first electrical signal, the feedback circuit calculates a difference between the first electrical signal and the preset electrical signal, and determines a corresponding compensation signal according to the magnitude and the sign of the difference, and after the compensation signal is compensated to the light emitting device 100, the brightness of the light emitting device 100 may be adjusted to achieve the effect of "although the brightness of each area of the environment is different, the actual screen display is also uneven", thereby enabling the viewer to visually generate the feeling of uniform screen brightness.
Under the same display brightness of the OLED display panel, better environment brightness exists, the watching effect is better after the environment brightness and the panel display brightness are mutually matched, and therefore, an electric signal corresponding to the light intensity of the better environment brightness can be used as a preset electric signal. In addition, in the ultra-large OLED display panel, the middle area and the edge area of the display area of the OLED display panel are far apart, and the ambient light in the middle area and the ambient light in the edge area are different in brightness, so that the electrical signal corresponding to the light intensity of the ambient light in the middle area can be used as the preset electrical signal.
The display area includes a first display area 11 adjacent to the light sensor 30, and the pixel driving circuit corresponding to the light emitting device 100 in the first display area 11 is further configured to input a compensation signal to the corresponding light emitting device 100 to adjust the light emitting brightness of the light emitting device 100. As shown in fig. 1, a plurality of optical sensors 30 are disposed in the non-display area 20, each optical sensor 30 can convert the light intensity signal of the ambient light around the area where the optical sensor is located into a first electrical signal, the feedback circuit determines a compensation signal according to the positive and negative sum of the difference after obtaining the difference between the first electrical signal and a preset electrical signal, and then the pixel driving circuit corresponding to each light emitting device 100 inputs the compensation signal to the corresponding light emitting device 100 in the first display area 11 near the optical sensor 30, so that each light emitting device 100 displays different brightness, and the uniform viewing brightness of each area of the display panel is achieved after matching with the ambient light.
According to the size, position, and spacing of the optical sensors 30, the size of the first display region 11 corresponding to each optical sensor 30 is different, each first display region 11 may include m × n light emitting devices 100, and the values of m and n in different first display regions 11 may be the same or different.
The pixel driving circuit is configured to input a first compensation signal to the corresponding light emitting device 100 when a difference between the first electrical signal and the preset electrical signal is a positive value, so as to decrease the light emitting luminance of the light emitting device 100, and input a second compensation signal to the corresponding light emitting device 100 when the difference between the first electrical signal and the preset electrical signal is a negative value, so as to increase the light emitting luminance of the light emitting device 100.
When the difference between the first electrical signal and the preset electrical signal is a positive value, it indicates that the light intensity of the ambient light is too large, the luminance of the corresponding light emitting device 100 needs to be decreased, and the larger the difference is, the larger the luminance value needs to be decreased, so that the pixel driving circuit inputs the first compensation signal to the corresponding light emitting device 100, and the luminance brightness of the light emitting device 100 is decreased, and when the difference between the first electrical signal and the preset electrical signal is a negative value, it indicates that the light intensity of the ambient light is too small, the luminance of the corresponding light emitting device 100 needs to be increased, and the larger the difference is, the larger the luminance value needs to be increased, so the pixel driving circuit inputs the second compensation signal to the corresponding light emitting device 100, and the luminance brightness of the light emitting device 100 is increased. Through the compensation operation, the brightness uniformity of the viewing picture at all positions of the OLED display panel can be realized.
As shown in fig. 4, the pixel driving circuit corresponding to the light emitting device in the first display region 11 includes a data signal input module 101, a driving module 102, a storage module 103, and a compensation module 104. The data signal input module 101 is configured to input a first data signal to a first point g under the control of a control signal WR; the driving module 102 is connected to the data signal input module 101 through a first point g, and connected to the light emitting device 100 through a second point s, and is configured to drive the light emitting device 100 to emit light under the control of a potential of the first point g and a power high potential signal VDD; the storage module 103 is connected to the driving module 102 through a first point g and a second point s, and is configured to store a threshold voltage of the driving module 1032; the compensation module 104 is connected to the light emitting device 100 through a second point s, and is configured to input a compensation signal to the light emitting device 100 under the control of the control signal WR to adjust the light emitting brightness of the light emitting device 100.
Specifically, the Data signal input module 101 includes a first transistor T1, a gate of the first transistor T1 is connected to the control signal WR, a first electrode of the first transistor T1 is connected to the Data line Data, and a second electrode of the first transistor T1 is connected to the first point g.
The driving module 102 includes a second transistor T2, a gate of the second transistor T2 is connected to the first point g, a first electrode of the second transistor T2 is connected to the power high potential signal VDD, and a second electrode of the second transistor T2 is connected to the light emitting device 100 through the second point s.
The storage module 103 comprises a storage capacitor C, a first plate of which is connected to the first point g and a second plate of which is connected to the second point s.
The compensation module 104 includes a third transistor T3, a gate of the third transistor T3 is connected to the control signal WR, a first electrode of the third transistor T3 is connected to the second point s, a second electrode of the third transistor T3 is connected to a control line, and the other end of the control line is connected to the feedback circuit.
The anode of the light emitting device 100 is connected to the second point s, and the cathode of the light emitting device 100 is connected to a power low potential signal VSS. In the OLED display panel, each sub-pixel corresponds to one light emitting device 100.
In the present application, one of the first electrode and the second electrode of each transistor is a source, and the other is a drain, a voltage value of the power high potential signal VDD is larger than a voltage value of the power low potential signal VSS, and the Data line Data is used for inputting a Data signal. In the driving block 102, the second transistor T2 is a driving transistor, and the threshold voltage of the driving block 102 is the threshold voltage Vth of the second transistor T2. Each transistor may be an N-type or P-type transistor.
After the feedback circuit determines the compensation signal, the pixel driving circuit in the first display region 11 inputs the compensation signal to the corresponding light emitting device 100 to adjust the light emitting luminance of the light emitting device 100. In the display phase of the OLED display panel, the driving module 101 in the pixel driving circuit inputs a first data signal Vdata to a first point g, a voltage value Vg of the first point g is equal to Vdata, the compensation module 104 inputs a compensation signal V1 to the light emitting device 100, and a voltage value Vs of a second point s is equal to V1.
The driving current I flowing through the light emitting device 100 satisfies the formula: k (Vgs-Vth)2, where Vgs is the pressure difference between the first point g and the second point s. Since K is an intrinsic conductivity factor of the driving thin film transistor, i.e., the second transistor T2, and Vth is a threshold voltage of the second transistor T2, both of which are constant values, the magnitude of the driving current I flowing through the light emitting device 100 depends on the voltage difference Vgs between the first point g and the second point s. Because the gates of the first transistor T1 and the third transistor T3 are both connected to the control signal WR and are turned on simultaneously during operation, when the first data signal Vdata is input to the driving module 101, the compensation signal V1 is also input to the compensation module 104, and the compensation signal V cooperate to adjust the driving current I flowing through the light emitting device 100 in each first display region 11 of the OLED display panel to different degrees, so that the brightness uniformity of the viewing images of all the positions of the OLED display panel can be realized.
In one embodiment, the OLED display panel further includes an amplifying circuit, an input end of the amplifying circuit is connected to the optical sensor, and an output end of the amplifying circuit is connected to the feedback circuit, and the amplifying circuit is configured to amplify the first electrical signal by a preset multiple and output the amplified first electrical signal to the feedback circuit. The amplifying circuit comprises a Field Effect Transistor (FET) amplifier for amplifying voltage signals, wherein the FET in the optical sensor 30 can only form an N region, so that the Field Effect Transistor (FET) amplifier is adopted, the FET has the characteristics of high input resistance and low output resistance, the voltage signals can be amplified, the field effect transistor amplifier receives the first electric signals converted by the optical sensor 30 and amplifies the first electric signals by preset times, and the first electric signals generated after the environmental light irradiates the optical sensor 30 are smaller, so that the detection difficulty can be reduced, the accuracy is improved, and the misoperation probability is reduced after the first electric signals are amplified. The amplification factor of the fet amplifier may be set according to actual needs, for example, the amplification factor is 10.
In an embodiment, the light sensors 30 are disposed at equal intervals in the non-display area 11, so that the number of the light emitting devices 100 in the first display area 11 corresponding to each light sensor 30 is the same, the first display areas 11 are connected to each other to form an annular area surrounding the middle area of the display area by adjusting the intervals of the light sensors 30, and the brightness of each light emitting device 100 in the annular area is compensated, so that the overall viewing brightness of the OLED display panel is more uniform.
The application also provides a display device, which comprises an OLED display panel and a driving chip, wherein the OLED display panel is any one of the OLED display panels. The utility model provides a display device sets up the light sensor through the non-display area at OLED display panel, turns into the light intensity signal of ambient light first signal of telecommunication to compensate the luminescent device luminance that is close to the light sensor through feedback circuit and pixel drive circuit, make the actual display luminance of first display area also change thereupon along with ambient light intensity's difference, both cooperate each other and can make and watch the picture luminance even.
According to the above embodiment:
the application provides an OLED display panel and display device, OLED display panel include the display area and surround the non-display area that the display area set up still includes: a plurality of light emitting devices arranged in an array in the display area; a pixel driving circuit for driving the light emitting device to emit light; the light sensor is arranged in the non-display area and used for converting a light intensity signal of ambient light into a first electric signal; the feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal; the display area comprises a first display area close to the optical sensor, and the pixel driving circuit corresponding to the light-emitting device in the first display area is also used for inputting a compensation signal to the corresponding light-emitting device so as to adjust the light-emitting brightness of the light-emitting device. This application is through setting up light sensor at the non-display area, turns into first signal of telecommunication with the light intensity signal of ambient light to compensate the luminescent device luminance that is close to light sensor through feedback circuit and pixel drive circuit, make the actual display luminance of first display area also change thereupon along with ambient light intensity's difference, both cooperate each other and can make and watch the picture luminance even.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The OLED display panel and the display device provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the description of the embodiments above is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. An OLED display panel including a display area and a non-display area disposed around the display area, comprising:
a plurality of light emitting devices arranged in an array within the display area;
a pixel driving circuit for driving the light emitting device to emit light;
the light sensor is arranged in the non-display area and used for converting a light intensity signal of ambient light into a first electric signal;
the feedback circuit is used for determining a compensation signal according to the difference value of the first electric signal and a preset electric signal;
the display area comprises a first display area close to the optical sensor, and the pixel driving circuit corresponding to the light-emitting device in the first display area is also used for inputting the compensation signal to the corresponding light-emitting device so as to adjust the light-emitting brightness of the light-emitting device.
2. The OLED display panel of claim 1, wherein the pixel driving circuit is configured to input a first compensation signal to the corresponding light emitting device to decrease the light emitting luminance of the light emitting device when the difference between the first electrical signal and the predetermined electrical signal is a positive value, and to input a second compensation signal to the corresponding light emitting device to increase the light emitting luminance of the light emitting device when the difference between the first electrical signal and the predetermined electrical signal is a negative value.
3. The OLED display panel of claim 1, further comprising an amplifier circuit, wherein an input terminal of the amplifier circuit is connected to the light sensor, and an output terminal of the amplifier circuit is connected to the feedback circuit, and configured to amplify the first electrical signal by a predetermined multiple and output the amplified first electrical signal to the feedback circuit.
4. The OLED display panel of claim 3, wherein the amplification circuit includes a field effect transistor amplifier.
5. The OLED display panel of claim 1, wherein the light sensor comprises a metal oxide transistor, the metal oxide transistor comprises a light shielding layer, a buffer layer, a metal oxide active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, a source electrode and a drain electrode which are stacked in sequence in a light emitting direction of the OLED display panel, and the gate electrode is made of a transparent conductive material.
6. The OLED display panel of claim 5, wherein the gate material includes at least one of indium tin oxide, indium zinc oxide, indium gallium zinc oxide, indium zinc tin oxide, indium gallium zinc tin oxide.
7. The OLED display panel of claim 5, wherein the material of the gate insulating layer includes aluminum oxide.
8. The OLED display panel of claim 1, wherein the light sensors are disposed at equal intervals in the non-display region.
9. The OLED display panel of claim 1, wherein the pixel driving circuit includes:
the data signal input module is used for inputting a first data signal to a first point under the control of the control signal;
the driving module is connected with the data signal input module through the first point, is connected with the light-emitting device through the second point, and is used for driving the light-emitting device to emit light under the control of the first point potential and a power high potential signal;
the storage module is connected with the driving module through the first point and the second point and is used for storing the threshold voltage of the driving module;
and the compensation module is connected with the light-emitting device through the second point and is used for inputting the compensation signal to the light-emitting device under the control of the control signal so as to adjust the light-emitting brightness of the light-emitting device.
10. A display device, comprising an OLED display panel according to any one of claims 1 to 9 and a driving chip.
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