CN114974121B - Display panel and compensation method thereof - Google Patents
Display panel and compensation method thereof Download PDFInfo
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- CN114974121B CN114974121B CN202210924412.9A CN202210924412A CN114974121B CN 114974121 B CN114974121 B CN 114974121B CN 202210924412 A CN202210924412 A CN 202210924412A CN 114974121 B CN114974121 B CN 114974121B
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3258—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] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- Engineering & Computer Science (AREA)
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- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a display panel and a compensation method thereof, wherein the display panel comprises a first substrate and a plurality of active light-emitting units arranged on the first substrate in an array manner, each active light-emitting unit comprises a cathode layer, an anode layer and a light-emitting layer arranged between the cathode layer and the anode layer, and the cathode layers of the active light-emitting units are mutually communicated; the display panel further includes: the detection electrode is arranged opposite to the cathode layer; the detection electrode is insulated and separated from the cathode layer, and a capacitor is formed; the detection circuit is used for detecting a voltage signal on the detection electrode, calculating a voltage abnormal area of the detection electrode according to the voltage signal and outputting a compensation signal according to the voltage abnormal area; the compensation circuit is connected with the detection circuit and used for receiving the compensation signal of the detection circuit and performing voltage compensation on the area of the cathode layer corresponding to the voltage abnormal area. The cathode layer of the display panel is improved by the scheme, and the problem of large resistance voltage drop exists.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel and a compensation method thereof.
Background
Organic Light Emitting Diodes (OLEDs) belong to a new type of current type semiconductor Light Emitting device, and belong to an autonomous Light Emitting technology by controlling the carrier of the device such as and in line with exciting Organic material to emit Light for display. Compared with a passive light emitting Liquid Crystal Display (LCD), the OLED Display with self-emission has the advantages of fast response speed, high contrast, wide viewing angle, and the like, is easy to realize flexible Display, and is generally seen in the industry.
The display substrate of the oled display panel includes a thin film transistor array and an active light emitting cell array, and one active light emitting cell generally includes an anode layer, a cathode layer and a light emitting layer. The cathode layer is generally formed by sputtering a transparent material such as Indium Tin Oxide (ITO) or depositing a transparent material having a high reflectance over the light-emitting layer. If the cathode layer is formed by sputtering ITO, the light emitting layer is easily damaged, and the light emitting efficiency of the organic light emitting diode display panel is reduced. The cathode layer may be formed by evaporating a transparent material, but the cathode layer formed in this way generally has a large resistance, and generates a large resistance Drop (IR Drop) during display, which eventually reduces the picture quality of the display panel. Therefore, how to solve the problem of large resistance drop of the cathode layer becomes a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The present disclosure is directed to a display panel and a compensation method thereof, so as to solve a problem of a large resistance drop of a cathode layer of the display panel.
The application discloses a display panel, which comprises a first substrate base plate and a plurality of active light-emitting units arranged on the first substrate base plate in an array manner, wherein each active light-emitting unit comprises a cathode layer, an anode layer and a light-emitting layer arranged between the cathode layer and the anode layer, and the cathode layers of the active light-emitting units are mutually communicated; the display panel further includes: the detection electrode is arranged opposite to the cathode layer; the detection electrode is insulated and spaced from the cathode layer, and a capacitor is formed; the detection circuit is used for detecting a voltage signal on the detection electrode, calculating a voltage abnormal area of the detection electrode according to the voltage signal, and outputting a compensation signal according to the voltage abnormal area; the compensation circuit is connected to the detection circuit and used for receiving the compensation signal of the detection circuit and performing voltage compensation on the region of the cathode layer corresponding to the voltage abnormal region.
Optionally, the detecting electrode includes a plurality of first electrode strips along a first direction and a plurality of second electrode strips along a second direction, and the plurality of first electrode strips and the plurality of second electrode strips are respectively externally connected to the detecting circuit; the cathode layer comprises a plurality of cathode voltage input points, the cathode voltage input points are respectively and correspondingly arranged at two ends of the first electrode strips and the second electrode strips, and the number of the cathode voltage input points is less than or equal to two times of the sum of the number of the first electrode strips and the number of the second electrode strips; the detection circuit is used for receiving voltage signals of the first electrode strips and voltage signals of the second electrode strips, positioning a voltage abnormal area of the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips, and outputting a compensation signal according to the voltage abnormal area; and the compensation circuit performs voltage compensation on the region of the cathode layer corresponding to the voltage abnormal region through the cathode voltage input point according to the compensation signal.
Optionally, the first direction is perpendicular to the second direction, the first electrode strips and the second electrode strips are arranged in the same layer, and a plurality of first electrode strips and a plurality of second electrode strips form a mutually communicated mesh structure; the display panel further comprises a plurality of scanning lines and a plurality of data lines, wherein the scanning lines are arranged along the first direction, and the data lines are arranged along the second direction.
Optionally, one active light emitting unit is disposed between two adjacent data lines and two adjacent scan lines, at least one scan line is disposed between two adjacent first electrode strips, and at least one data line is disposed between two adjacent second electrode strips, on the projection of the first substrate.
Optionally, the cathode layer is continuously disposed in a whole layer, the plurality of cathode voltage input points are disposed around the cathode layer, and the compensation circuit controls the cathode voltage input points close to the voltage abnormal region to perform voltage compensation on the cathode layer according to the voltage abnormal region.
Optionally, the first electrode stripes are disposed corresponding to the scan lines, and in the projection of the first substrate, the first electrode stripes are overlapped with the scan lines, the second electrode stripes are disposed corresponding to the data lines, and in the projection of the first substrate, the second electrode stripes are overlapped with the data lines.
The application also discloses a compensation method of the display panel, wherein the display panel is the display panel, and the compensation method comprises the following steps:
inputting a preset voltage to a cathode layer of the active light-emitting unit, driving the active light-emitting unit to normally display by a display panel, and acquiring detection voltage distribution on the detection electrode;
determining a voltage abnormal area of the cathode layer according to the detection voltage distribution on the detection electrode;
and performing voltage compensation on the voltage abnormal area of the cathode layer.
Optionally, before the step of inputting a preset voltage to the cathode layer of the active light emitting unit, the pixel driving circuit drives the light emitting unit to normally display, and obtaining the distribution of the detection voltage on the detection electrode, the method includes:
initializing the voltage of a cathode layer of the active light-emitting unit to obtain initial voltage distribution on the detection electrode;
the step of determining the voltage abnormal area of the cathode layer according to the detection voltage distribution on the detection electrode comprises the following steps:
and determining a voltage abnormal area of the detection electrode according to the initial voltage distribution and the detection voltage distribution on the detection electrode, and determining a voltage abnormal area of the cathode layer according to the voltage abnormal area of the detection electrode.
Optionally, the step of initializing the voltage of the cathode layer of the active light emitting unit and obtaining the initial voltage distribution on the detection electrode includes:
initializing the voltage of a cathode layer of the active light emitting unit;
acquiring voltage signals of a plurality of first electrode strips and voltage signals of a plurality of second electrode strips;
determining initial voltage distribution on the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips;
the step of inputting a preset voltage to the cathode layer of the active light-emitting unit, driving the active light-emitting unit to normally display by the display panel, and acquiring the distribution of the detection voltage on the detection electrode comprises the following steps:
a preset voltage is input to the cathode layer of the active light-emitting unit, and the display panel drives the active light-emitting unit to normally display;
acquiring voltage signals of a plurality of first electrode strips and voltage signals of a plurality of second electrode strips;
determining detection voltage distribution on the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips;
the detection electrode comprises a plurality of first electrode strips along a first direction and a plurality of second electrode strips along a second direction, and the first direction is perpendicular to the second direction.
Optionally, the step of performing voltage compensation on the voltage abnormal region of the cathode layer includes:
determining an input point close to the voltage abnormal area of the cathode layer according to the voltage abnormal area of the cathode layer;
and performing voltage compensation on the voltage abnormal area of the cathode layer through an input point close to the voltage abnormal area of the cathode layer.
This application is through setting up the detecting electrode, and this detecting electrode corresponds with the cathode layer and forms electric capacity, and can know according to Q = CV, and under the unchangeable and electric capacity saturation's of electric capacity storage, when the voltage of one of them electrode at electric capacity both ends changed, the voltage that corresponds another electrode and also can change at the corresponding position, based on this principle, the voltage distribution condition to the detecting electrode of accessible, judges the voltage abnormal area of cathode layer, and this voltage abnormal area is the resistance drop region that corresponds promptly. And then, the voltage compensation is carried out on the cathode layer in the resistance voltage drop area, so that the resistance voltage drop problem of the cathode layer can be solved, and the display effect of the display panel is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic cross-sectional view of a display panel of the present application;
fig. 2 is a schematic top view of a detecting electrode of the display panel of the present application;
FIG. 3 is a schematic top view of a cathode layer of a display panel of the present application;
FIG. 4 is a schematic diagram illustrating the steps of the compensation method for a display panel according to the present application;
FIG. 5 is a schematic diagram illustrating steps of a specific compensation method for a display panel according to the present invention.
100, a display panel; 101. a first substrate base plate; 110. an active light emitting unit; 111. a cathode layer; 112. an anode layer; 113. a light emitting layer; 114. a packaging layer; 120. a detection electrode; 121. a first electrode strip; 122. a second electrode strip; 130. and a cathode voltage input point.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application is described in detail below with reference to the figures and alternative embodiments.
Fig. 1 is a schematic cross-sectional view of a display panel of the present application, and as shown in fig. 1, the present application discloses a display panel 100, which includes a first substrate 101 and a plurality of active light emitting units 110 arranged on the first substrate 101 in an array, where the active light emitting units 110 include a cathode layer 111, an anode layer 112, and a light emitting layer 113 arranged between the cathode layer 111 and the anode layer 112, and the cathode layers 111 of the plurality of active light emitting units 110 are connected to each other; the display panel 100 further includes: a detection electrode 120, a detection circuit and a compensation circuit, the detection electrode 120 being disposed opposite to the cathode layer 111; the detecting electrode 120 is insulated and spaced from the cathode layer 111, and forms a capacitor; the detection circuit is configured to detect a voltage signal on the detection electrode 120, calculate a voltage abnormal region of the detection electrode according to the voltage signal on the detection electrode 120, and output a compensation signal according to the voltage abnormal region, where the voltage abnormal region of the cathode layer 111 can be determined by the voltage abnormal region of the detection electrode, and the compensation circuit is connected to the detection circuit and configured to receive the compensation signal of the detection circuit and perform voltage compensation on a region of the cathode layer corresponding to the voltage abnormal region.
According to the present application, by providing the detecting electrode 120, the detecting electrode 120 and the cathode layer 111 correspond to form a capacitor, and it can be known from Q = CV, (where Q is an electric quantity, C is a capacitor, and V is a voltage difference between two ends of the capacitor) that the capacitor is not changed and the capacitor is saturated in stored electric quantity, when a voltage of one of the two electrodes at two ends of the capacitor is changed, a voltage corresponding to the other electrode at a corresponding position is also changed, based on this principle, a voltage abnormal region of the cathode layer 111 can be determined by a voltage distribution condition of the detecting electrode 120, and the voltage abnormal region is a corresponding resistance drop region. The voltage compensation is performed on the cathode layer 111 in the resistance voltage drop area, so that the resistance voltage drop problem of the cathode layer 111 can be solved, and further, the potential difference of each position of the cathode layer 111 is not large, so that the light emitting uniformity of the active light emitting unit 110 in the display panel 100 is better, and the display effect of the display panel 100 is further improved.
Fig. 2 is a schematic top view of a detection electrode of a display panel according to the present application, and as shown in fig. 2, the detection electrode 120 includes a plurality of first electrode stripes 121 along a first direction and a plurality of second electrode stripes 122 along a second direction, the first direction and the second direction are perpendicular, and the plurality of first electrode stripes 121 and the plurality of second electrode stripes 122 form a mesh structure that is communicated with each other. The first electrode stripes 121 and the second electrode stripes 122 are communicated with each other at crossing positions, and the electric potential corresponding to the crossing positions can be calculated according to the voltages detected on the corresponding first electrode stripes 121 and the corresponding second electrode stripes 122. In this embodiment, by disposing the mesh-shaped detecting electrode 120, a plurality of crossing positions corresponding to the cathode layer 111 can be generated, and the voltage variation at the crossing positions can be located by the positions of the first electrode strips 121 and the positions of the second electrode strips 122. As shown in fig. 2, for example, along a first direction, a first electrode stripe 121 is A1, a second electrode stripe 121 is A2, a third electrode stripe 121 is A3, 8230a, an nth first electrode stripe 121 is An, and along a second direction, a first second electrode stripe 122 is B1, a second stripe is B2, a third stripe is B3, 8230a, and An nth second electrode stripe 122 is Bn. The voltage at the intersection of the points A2 and B2 is the voltage at the point a, and when the voltage at the point a is insufficient or reduced due to resistance drop or other process factors, the voltage at the first electrode bar 121 of the point A2 changes, and the voltage at the second electrode bar 122 of the point B2 also changes and is weaker than the voltage at the adjacent first electrode bar 121 or second electrode bar 122, so that the voltage abnormal region of the cathode layer 111 due to resistance drop can be inferred through the detection electrode 120 with the mesh structure. It should be understood that the first direction and the second direction are directions of the display panel 100 along two adjacent sides of the display panel 100 on the light emitting surface, and the first direction and the second direction are perpendicular to each other. Specifically, the cathode layer 111 includes a plurality of cathode voltage input points 130, the plurality of cathode voltage input points 130 are respectively disposed at two ends of the plurality of first electrode bars and the plurality of second electrode bars, and the number of cathode voltage input points is less than or equal to twice the sum of the number of the first electrode bars and the number of the second electrode bars. The number of cathode voltage input points of this embodiment can be selected according to actual conditions, and need not correspond to the number of first electrode stripes and second electrode stripes, can be designed according to regions.
Specifically, the plurality of first electrode strips 121 and the plurality of second electrode strips 122 are externally connected to a detection circuit, the detection circuit is configured to receive voltage signals of the plurality of first electrode strips and voltage signals of the plurality of second electrode strips, and position a voltage abnormal region of the detection electrode according to the voltage signals of the plurality of first electrode strips and the voltage signals of the plurality of second electrode strips, the detection circuit is configured to receive voltage changes of the plurality of first electrode strips 121 and voltage changes of the plurality of second electrode strips 122, and position a voltage abnormal region of the detection electrode 120 according to the voltage changes of the plurality of first electrode strips 121 and the voltage changes of the plurality of second electrode strips 122, and control the display panel to perform voltage compensation on the voltage abnormal region of the cathode layer 111 corresponding to the detection electrode 120. Taking point a in fig. 2 as an example, assuming that the voltage drop occurs in the cathode layer 111 at point a, when the potential on the mesh structure of the detection electrode 120 changes accordingly (according to the capacitive coupling principle, under the condition that the electric quantity is not changed/the capacitance is not changed, the voltage of the cathode layer 111 changes, and the voltage of the corresponding detection electrode 120 changes), assuming that point a changes, the maximum voltage drop is detected from the A2 first electrode strip 121 on the detection electrode 120, the voltage drops of the A1 first electrode strip 121 and the A3 first electrode strip 121 decrease, and the voltage drops detected by the A4 first electrode strip 121 and the A5 first electrode strip 121 decrease in sequence, and according to the change trend of the voltage drops, the vertical coordinate position where the voltage drop actually occurs can be located as point A2, and similarly, the B2 position can be located, so as to achieve the addressing purpose, and the specific position where the voltage drop occurs is located as point a. It should be understood that the detection circuit includes a detection chip, the detection chip includes a receiving module, the receiving module receives voltage signals on the plurality of first electrode strips and the plurality of second electrode strips, the signal processing module restores voltage distribution conditions of the plurality of first electrode strips and the plurality of second electrode strips according to the received voltage signals, and locates a voltage abnormal region according to a variation trend of a voltage drop, the feedback module outputs a compensation signal according to the voltage abnormal region, and the compensation circuit performs voltage compensation on the cathode layer according to the compensation signal.
Specifically, the display panel 100 further includes a plurality of scan lines disposed along a first direction and a plurality of data lines disposed along a second direction, one of the active light emitting units 110 is disposed between two adjacent data lines and two adjacent scan lines, the active light emitting unit 110 is further connected to a thin film transistor, a gate of the thin film transistor is connected to the scan lines, and a source of the thin film transistor is connected to the data lines, and for a pixel driving circuit of the OLED display panel, the driving circuit has a different driving architecture, for example, a 2T1C pixel driving circuit controls one active light emitting unit through two thin film transistors, the driving architecture of the pixel driving circuit is not limited in this embodiment, and for example, the driving architecture of 7T1C is also applicable. It should be understood that the scanning lines are driven line by line, and during the driving process of the scanning lines line by line, only one line of the scanning lines is in a conducting state, for example, the scanning line in the area corresponding to the A1 first electrode strip 121 is in an open state, and at this time, the potential on the A1 first electrode strip 121 is detected, and according to the voltage detection of B1-Bn, whether a voltage abnormal area exists on the A1 first electrode strip 121 can be determined, and so on, the voltage distribution on the detection electrode 120 can be calculated. The detection circuit in this embodiment can detect the voltage distribution on each first electrode strip in different periods according to the line-by-line scanning process of the scanning line, and finally obtain the voltage distribution trend of each position on the detection electrode in combination with the voltage distribution on each second electrode strip in the same period, and calculate the voltage abnormal region.
On the projection of the first substrate base plate 101, at least one scanning line is arranged between two adjacent first electrode strips 121, and at least one data line is arranged between two adjacent second electrode strips 122. The number and density of the first electrode stripes 121 in this embodiment can be selected according to actual situations, for example, one first electrode stripe 121 is disposed for one scan line, and has a one-to-one correspondence relationship. However, in practical applications, since the voltage variation area of the cathode layer 111 is not accurate to each active light emitting unit 110, and actually corresponds to a plurality of active light emitting units 110, a plurality of data lines may be disposed between every two adjacent first electrode strips 121, that is, a plurality of active light emitting units 110 are disposed between every two adjacent first electrode strips 121, and a specific application scenario may be corrected according to an actual voltage drop of the cathode layer 111, that is, a required detection accuracy.
Of course, besides the way mentioned in this application that the first electrode strips and the second electrode strips are vertically arranged, the first electrode strips and the second electrode strips may also form a diamond-shaped mesh structure. Correspondingly, in the scanning period of the first scan line, the A1 electrode bar only detects the crossing point corresponding to the first scan line, instead of the voltage of the first electrode bar parallel to the scan line, but detects the voltage of the first electrode bar in the first direction (the first direction is not parallel to the scan line), and then deduces the voltage distribution on the first electrode bar according to the voltage distribution on each second electrode bar, which is the same as the above principle. It should be noted that, the detecting electrode of the present application may also be designed as a whole block, and may detect whether the overall voltage of the cathode layer meets a preset standard, but the accuracy of the detecting electrode is not as good as that of the detecting electrode of the mesh structure formed by the plurality of first electrode strips and the plurality of second electrode strips.
Fig. 3 is a schematic top view of a cathode layer of the display panel of the present application, and as shown in fig. 3, the voltage compensation manner for the voltage abnormal area of the cathode layer 111 may include a multi-point input manner, that is, the cathode layer 111 is a whole block (whole layer is continuous), a plurality of cathode voltage input points 130 are disposed around the cathode layer 111, and the detection circuit controls the cathode voltage input points 130 close to the voltage abnormal area of the detection electrode 120 to perform voltage compensation on the cathode layer 111 according to the voltage abnormal area of the detection electrode 120.
It should be mentioned that the input point of the cathode layer is generally connected to Vss voltage (common ground voltage), and multiple input points are input by Vss voltage from different directions of the cathode layer at the same time or at different time intervals, and different input points have different labels. Specifically, according to the voltage abnormal region detected by the detection circuit, the input point of the mark corresponding to the voltage abnormal region can be selected, and the Vss voltage of the input point can be increased to ensure that the cathode layer voltage of the abnormal region is consistent with the cathode layer voltages of other regions. The present embodiment may further include a mode of detecting again through the detecting electrode after the voltage compensation, specifically, as described above, the mode may be detected again, and it is determined that the voltage compensated by the input point of the voltage abnormal region is sufficient.
Specifically, the detecting electrode 120 is disposed above the cathode layer 111 and insulated and separated by the encapsulation layer 114 of the active light emitting unit 110, the anode layer 112 of the active light emitting unit 110 is disposed above the first substrate 101, the light emitting layer 113 is disposed above the anode layer 112, and the cathode layer 111 is disposed for covering all the light emitting layers 113 of the active light emitting unit 110.
Specifically, the sensing electrode 120 is disposed corresponding to a non-light-transmitting region in the display region of the display panel 100. Specifically, the first electrode stripes are disposed corresponding to the scan lines, and in a projection of the first substrate, the first electrode stripes are overlapped with the scan lines, the second electrode stripes are disposed corresponding to the data lines, and in a projection of the first substrate, the second electrode stripes are overlapped with the data lines. The position of the detecting electrode 120 is distributed in a non-light-transmitting area of the display panel 100, i.e., a light-shielding area in a display area of the display panel 100, for example, a data line, a scan line, a thin film transistor, and the like, which can shield light, and is disposed corresponding to the light-shielding area. Specifically, the first electrode strips are respectively arranged corresponding to the scanning lines, the second electrode strips are respectively arranged corresponding to the data lines, at least one scanning line is arranged between every two adjacent first electrode strips, and at least one data line is arranged between every two adjacent second electrode strips. In this embodiment, the detection electrode may be made of a light-shielding material or a transparent material, and the thickness of the detection electrode 120 does not need to be considered, so that a thicker electrode material may be used, the impedance is reduced, and the accuracy of signal detection is improved; it should be noted here that after the packaging is completed, the capacitance between the detecting electrode 120 and the cathode layer 111 of the active light emitting unit 110 is fixed. The mesh-shaped detecting electrode 120 can be formed by mask evaporation of the transparent conductive layer.
Fig. 4 is a schematic step diagram of a compensation method for a display panel according to the present application, and as shown in fig. 4, the present application further discloses a compensation method for a display panel, where the display panel is the above display panel, and the compensation method includes the steps of:
s1: inputting a preset voltage to a cathode layer of the active light-emitting unit, driving the active light-emitting unit to normally display by the display panel, and acquiring detection voltage distribution on the detection electrode;
s2: determining a voltage abnormal area of the cathode layer according to the detection voltage distribution on the detection electrode;
s3: and performing voltage compensation on the voltage abnormal area of the cathode layer.
In the compensation method for the display panel in this embodiment, the voltage abnormal region of the cathode layer is determined by the distribution of the detection voltage of the detection electrode, the detection electrode and the cathode layer form a capacitor, and it can be known from Q = CV that, when the capacitor is not changed and the capacitor storage capacity is saturated, and the voltage of one of the two electrodes at the two ends of the capacitor is changed, the voltage of the other electrode at the corresponding position is also changed. And voltage compensation is carried out on the cathode layer in the resistance voltage drop area, so that the resistance voltage drop problem of the cathode layer can be solved, the potential difference of each position of the cathode layer is ensured to be small, the light emitting uniformity of the active light emitting unit in the display panel is better, and the display effect of the display panel is improved. The normal working voltage of the cathode layer of the active light-emitting unit is 1-2V, namely the preset voltage is 1-2V, and the anode of the corresponding active light-emitting unit can reach 7V.
It should be noted that, in the embodiment, the detecting of the voltage distribution of the cathode layer by using the detecting electrode may be performed before the test leaves the factory, or may be continuously optimized in actual use, so as to take the problem of aging of the display panel into consideration, and a compensation manner of the cathode layer input may also be set, so as to solve the problem of inaccurate potential of the cathode layer caused by aging in actual use.
Specifically, at S1: the step of inputting a preset voltage to the cathode layer of the active light-emitting unit, driving the light-emitting unit to normally display by the pixel driving circuit, and acquiring the distribution of the detection voltage on the detection electrode comprises the following steps:
s0: initializing the voltage of a cathode layer of the active light-emitting unit to obtain initial voltage distribution on the detection electrode;
at S2: the step of determining the voltage abnormal region of the cathode layer according to the detection voltage distribution on the detection electrode includes:
s21: and determining a voltage abnormal area of the detection electrode according to the initial voltage distribution and the detection voltage distribution on the detection electrode, and determining a voltage abnormal area of the cathode layer according to the voltage abnormal area of the detection electrode.
In fact, due to the manufacturing process of the cathode layer, a complete and uniform whole cathode layer cannot be formed, and even if the cathode layer has uniform flatness, the cathode layer inevitably has a problem of resistance drop. In addition, not only the resistance voltage drop occurs in the cathode layer, but also the resistance voltage drop occurs in the detection electrode. Therefore, although the voltage initialization processing of the cathode layer is assigned 0V, actually, due to the non-uniformity of the manufacturing process, the voltage on the detecting electrode has a certain distribution, which is not completely 0V, and this is also the purpose of initialization. Because the detection electrode has certain impedance, for the receiving end, the actual voltage change received by A1-An/B1-Bn has gradient; as described above, in the initialization stage, the voltage variation of the detecting electrode is used to set the variation on the detecting electrode caused by the manufacturing process to zero, i.e. to eliminate the effect of the voltage drop on the detecting electrode. When the display panel works normally, all positions of the electrode are actually detected to receive the voltage of the cathode layer;
fig. 5 is a schematic diagram illustrating a compensation method of a display panel according to an embodiment of the present invention, and as shown in fig. 5, the compensation method includes the steps of:
the step of S0 comprises:
s01: initializing the voltage of a cathode layer of the active light-emitting unit;
s02: acquiring voltage changes of a plurality of first electrode strips and voltage changes of a plurality of second electrode strips;
s03: determining initial voltage distribution on the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips;
the step of S1 comprises:
s11: a preset voltage is input to the cathode layer of the active light-emitting unit, and the display panel drives the active light-emitting unit to normally display;
s12: acquiring voltage signals of a plurality of first electrode strips and voltage signals of a plurality of second electrode strips;
s13: determining detection voltage distribution on the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips;
the step of S2 comprises:
s21: and determining a voltage abnormal area of the detection electrode according to the initial voltage distribution and the detection voltage distribution on the detection electrode, and determining a voltage abnormal area of the cathode layer according to the voltage abnormal area of the detection electrode.
The step of S3 comprises:
s31: determining an input point close to the voltage abnormal area of the cathode layer according to the voltage abnormal area of the cathode layer;
s32: and performing voltage compensation on the voltage abnormal area of the cathode layer through an input point close to the voltage abnormal area of the cathode layer.
The specific process can be briefly described as follows: firstly, initializing, namely presetting a cathode layer to be 0V, wherein the voltage distribution state on the detection electrode is V1 (including each voltage on A1-An/B1-Bn), finishing the initialization of the current structure, and acquiring the initialization voltage of the detection electrode; when the display panel works normally next, a fixed voltage V2 is input to the cathode layer, and according to a capacitive coupling principle (Q = C × V), the voltage distribution detected by the detection electrode is theoretically = V1+ V2, but in actual work, due to the existence of resistance voltage drop, the voltage distribution on the actual detection electrode is < V1+ V2, and through the voltage difference of A1-An/B1-Bn, a specific voltage position can be located through the addressing mode, such as a signal abnormality of A2 and B2, an abnormal area can be located as An a part, and An abnormal area of A4/B4 signal is abnormal and An abnormal area can be located as a B area; the signals of the cathode layer are correspondingly required to be subjected to multi-point input, the signals of the local cathode layer are enhanced through a control mode of the multi-point input of the cathode layer according to the detected abnormal points, in practice, due to the fact that the signals of the cathode layer are whole, if the points a or b are abnormal in practical work, dynamic compensation can be carried out through a mode of controlling the multi-point input of the cathode layer, the voltage quantity and the voltage input position which need to be adjusted are determined through practical debugging, the voltage compensation function of the cathode layer is achieved, and the picture uniformity of the OLED is improved.
It should be noted that, on the premise of not affecting the implementation of the specific embodiment, the limitations of the steps involved in the present disclosure are not considered as limiting the order of the steps, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present disclosure.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, which can be applied to the above solutions.
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (9)
1. A display panel comprises a first substrate and multiple active light emitting units arranged on the first substrate in array, wherein the active light emitting units comprise cathode layers, anode layers and light emitting layers arranged between the cathode layers and the anode layers, the cathode layers of the active light emitting units are communicated with each other,
the display panel further includes: the detection electrode is arranged opposite to the cathode layer; the detection electrode is insulated and spaced from the cathode layer, and a capacitor is formed;
the detection circuit is used for detecting a voltage signal on the detection electrode, calculating a voltage abnormal area of the detection electrode according to the voltage signal, and outputting a compensation signal according to the voltage abnormal area;
the compensation circuit is connected to the detection circuit and used for receiving a compensation signal of the detection circuit and performing voltage compensation on an area of the cathode layer corresponding to the voltage abnormal area;
the detection electrode comprises a plurality of first electrode strips along a first direction and a plurality of second electrode strips along a second direction, and the plurality of first electrode strips and the plurality of second electrode strips are respectively externally connected to the detection circuit;
the cathode layer comprises a plurality of cathode voltage input points, the cathode voltage input points are respectively and correspondingly arranged at two ends of the first electrode strips and the second electrode strips, and the number of the cathode voltage input points is less than or equal to two times of the sum of the number of the first electrode strips and the number of the second electrode strips;
the detection circuit is used for receiving a plurality of voltage signals of the first electrode strips and a plurality of voltage signals of the second electrode strips, positioning a voltage abnormal area of the detection electrode according to the plurality of voltage signals of the first electrode strips and the plurality of voltage signals of the second electrode strips, and outputting a compensation signal according to the voltage abnormal area;
and the compensation circuit performs voltage compensation on the region of the cathode layer corresponding to the voltage abnormal region through the cathode voltage input point according to the compensation signal.
2. The display panel according to claim 1, wherein the first direction and the second direction are perpendicular, the first electrode strips and the second electrode strips are disposed in the same layer, and a plurality of the first electrode strips and a plurality of the second electrode strips form a mutually communicated mesh structure;
the display panel further comprises a plurality of scanning lines and a plurality of data lines, wherein the scanning lines are arranged along the first direction, and the data lines are arranged along the second direction.
3. The display panel according to claim 2, wherein one active light emitting unit is disposed between two adjacent data lines and two adjacent scan lines, at least one scan line is disposed between two adjacent first electrode stripes, and at least one data line is disposed between two adjacent second electrode stripes, in the projection of the first substrate.
4. The display panel according to claim 2, wherein the cathode layer is continuously provided over the entire layer, the plurality of cathode voltage input points are provided around the cathode layer, and the compensation circuit controls the cathode voltage input points near the voltage abnormality region to perform voltage compensation on the cathode layer according to the voltage abnormality region.
5. The display panel according to claim 3, wherein the first electrode stripes are disposed corresponding to the scan lines, and in projection onto the first substrate, the first electrode stripes overlap with the scan lines, wherein the second electrode stripes are disposed corresponding to the data lines, and in projection onto the first substrate, the second electrode stripes overlap with the data lines.
6. A compensation method for a display panel, wherein the display panel is the display panel of any one of claims 1 to 5, the compensation method comprising the steps of:
inputting a preset voltage to a cathode layer of the active light-emitting unit, driving the active light-emitting unit to normally display by a display panel, and acquiring detection voltage distribution on the detection electrode;
determining a voltage abnormal area of the cathode layer according to the detection voltage distribution on the detection electrode;
and performing voltage compensation on the voltage abnormal area of the cathode layer.
7. The compensation method for the display panel according to claim 6, wherein the step of inputting a predetermined voltage to the cathode layer of the active light emitting unit, the pixel driving circuit driving the light emitting unit to display normally, and obtaining the distribution of the detection voltage on the detection electrode comprises:
initializing the voltage of a cathode layer of the active light-emitting unit to obtain initial voltage distribution on the detection electrode;
the step of determining the voltage abnormal area of the cathode layer according to the detection voltage distribution on the detection electrode comprises the following steps:
and determining a voltage abnormal area of the detection electrode according to the initial voltage distribution and the detection voltage distribution on the detection electrode, and determining a voltage abnormal area of the cathode layer according to the voltage abnormal area of the detection electrode.
8. The compensation method for a display panel according to claim 7, wherein the step of initializing the voltage of the cathode layer of the active light emitting unit and obtaining the initial voltage distribution on the detecting electrode comprises:
the voltage of the cathode layer of the active light emitting cell is initialized,
acquiring voltage signals of a plurality of first electrode strips and voltage signals of a plurality of second electrode strips;
determining initial voltage distribution on the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips;
the cathode layer of the active light-emitting unit is input with a preset voltage, the display panel drives the active light-emitting unit to normally display, and the step of acquiring the distribution of the detection voltage on the detection electrode comprises the following steps:
a preset voltage is input to the cathode layer of the active light-emitting unit, and the display panel drives the active light-emitting unit to normally display;
acquiring voltage signals of a plurality of first electrode strips and voltage signals of a plurality of second electrode strips;
determining detection voltage distribution on the detection electrode according to the voltage signals of the first electrode strips and the voltage signals of the second electrode strips;
the detection electrode comprises a plurality of first electrode strips along a first direction and a plurality of second electrode strips along a second direction, and the first direction is perpendicular to the second direction.
9. The compensation method for a display panel according to claim 7, wherein the step of voltage-compensating the voltage abnormal region of the cathode layer comprises:
determining an input point close to the voltage abnormal area of the cathode layer according to the voltage abnormal area of the cathode layer;
and compensating the voltage of the cathode layer in the voltage abnormal area through an input point close to the voltage abnormal area of the cathode layer.
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| CN202210924412.9A CN114974121B (en) | 2022-08-03 | 2022-08-03 | Display panel and compensation method thereof |
| PCT/CN2022/136432 WO2024027061A1 (en) | 2022-08-03 | 2022-12-05 | Display panel and compensation method therefor |
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| CN114706249A (en) * | 2022-06-07 | 2022-07-05 | 惠科股份有限公司 | Display panel and display device |
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| KR100552963B1 (en) * | 2003-08-28 | 2006-02-15 | 삼성에스디아이 주식회사 | FPD with improved non-nuiform brightness |
| CN104659063A (en) * | 2014-12-30 | 2015-05-27 | 京东方科技集团股份有限公司 | Display substrate, manufacture method thereof, display panel and mask plate |
| CN106910764B (en) * | 2017-03-03 | 2019-08-02 | 京东方科技集团股份有限公司 | Oled display substrate, OLED display panel and its control method |
| CN107016965B (en) * | 2017-05-26 | 2019-04-30 | 深圳市华星光电半导体显示技术有限公司 | The compensation method of the OVSS voltage drop of OLED display and pixel-driving circuit |
| CN108417726A (en) * | 2018-03-20 | 2018-08-17 | 深圳市华星光电半导体显示技术有限公司 | OLED device and preparation method thereof |
| CN114974121B (en) * | 2022-08-03 | 2022-11-25 | 惠科股份有限公司 | Display panel and compensation method thereof |
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| CN110224009A (en) * | 2019-06-06 | 2019-09-10 | 京东方科技集团股份有限公司 | A kind of underlay substrate, display panel and preparation method thereof, display device |
| CN113571014A (en) * | 2021-07-16 | 2021-10-29 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
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| CN114706249A (en) * | 2022-06-07 | 2022-07-05 | 惠科股份有限公司 | Display panel and display device |
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