CN115223469A - Display panel detection method and device - Google Patents

Display panel detection method and device Download PDF

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Publication number
CN115223469A
CN115223469A CN202210911219.1A CN202210911219A CN115223469A CN 115223469 A CN115223469 A CN 115223469A CN 202210911219 A CN202210911219 A CN 202210911219A CN 115223469 A CN115223469 A CN 115223469A
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Prior art keywords
display
value
display panel
target
measured
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陈文君
刘元
唐乌力吉白尔
王志强
张建平
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BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
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BOE Technology Group Co Ltd
Ordos Yuansheng Optoelectronics Co Ltd
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Priority to CN202210911219.1A priority Critical patent/CN115223469A/en
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing

Abstract

The application discloses a detection method and a detection device for a display panel, wherein the method can detect the actually measured brightness values of a first display area and a second display area in the display panel when a target driving voltage is adopted to drive the display panel to display a target gray scale. Then, the actually measured gamma values of the two display areas can be determined based on the actually measured brightness values of the first display area and the second display area, and whether the display panel is qualified or not can be detected based on the difference value of the actually measured gamma values of the two display areas. Because the actually measured gamma values of the two display areas are determined based on the actually measured brightness values of the two display areas, the uniformity of the display brightness of the display panel can be accurately detected. Furthermore, the display panels entering the next process can be guaranteed to be display panels with qualified display performance, so that the yield of the prepared display device is high.

Description

Display panel detection method and device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a method and an apparatus for detecting a display panel.
Background
A manufacturing process of a Liquid Crystal Display (LCD) generally includes a front Array (Array) process, a middle pair Cell (Cell) process, and a back Module (MDL) process. The front-end Array process is used for manufacturing a Thin Film Transistor (TFT) Array substrate and a Color Filter (CF) substrate. The Cell process is used for carrying out Cell matching on the TFT array substrate and the CF substrate to obtain the display panel. The MDL process is used to assemble the display panel with other devices (e.g., a backlight and a driving circuit) to obtain a display device.
Due to the limitation of the manufacturing process precision, the brightness of different areas of the display panel obtained by the middle Cell manufacturing process may have differences, and such phenomena cannot be recovered to be normal through circuit debugging. If the display panel is assembled by the MDL process, the yield of the manufactured display device is seriously affected.
Disclosure of Invention
The application provides a detection method and device of a display panel, which can solve the problem that a display device prepared based on the display panel in the related technology is low in yield. The technical scheme is as follows:
in one aspect, a method for detecting a display panel is provided, the display panel including a first display area and a second display area; the method comprises the following steps:
determining a target driving voltage which enables an actually measured brightness value to reach a target brightness value when the display panel displays a target gray scale, wherein the target brightness value is a theoretical brightness value when the display panel displays the target gray scale under a target gamma value;
detecting a first actual measurement brightness value of the first display area and a second actual measurement brightness value of the second display area in the process of driving the display panel to display the target gray scale by adopting the target driving voltage;
determining a first measured gamma value for the first display region based on the first measured brightness value;
determining a second measured gamma value for the second display region based on the second measured brightness value;
and determining whether the display panel is qualified or not based on the difference value of the first measured gamma value and the second measured gamma value.
Optionally, the determining whether the display panel is qualified based on the difference between the first measured gamma value and the second measured gamma value includes:
if the difference value of the first measured gamma value and the second measured gamma value is smaller than or equal to a difference threshold value, determining that the display panel is qualified;
and if the difference value of the first measured gamma value and the second measured gamma value is larger than the difference threshold value, determining that the display panel is unqualified.
Optionally, the determining a target driving voltage for enabling a measured brightness value when the display panel displays a target gray scale to reach a target brightness value includes:
driving the display panel to display the target gray scale by adopting a plurality of different reference driving voltages;
in the process of driving the display panel to display the target gray scale by adopting each reference driving voltage, detecting an actually measured brightness value of any one of the first display area and the second display area;
and determining one reference driving voltage, which enables the difference value between the measured brightness value of any display area and the target brightness value to be smaller than an error threshold value, as the target driving voltage.
Optionally, the target brightness value L i Satisfies the following conditions:
Figure BDA0003773993670000021
wherein i is the target ashThe order m is the maximum gray scale that the display panel can display, L m The brightness value of any display area when displaying the maximum gray scale, n is the minimum gray scale that can be displayed by the display panel, and L n The gamma is the target gamma value, which is the brightness value of any display area when the minimum gray scale is displayed.
Optionally, the target gamma value is 2.2.
Optionally, the areas of the first display region and the second display region are equal;
the first measured brightness value is a measured brightness value of a first reference point in the first display area, and the second measured brightness value is a measured brightness value of a second reference point in the second display area.
Optionally, the first reference point is a center point of the first display area, and the second reference point is a center point of the second display area.
Optionally, the target gray level is 208.
In another aspect, a detection apparatus of a display panel is provided, the display panel including a first display region and a second display region; the device comprises: a brightness detection probe and a detection circuit;
the detection circuit is used for determining a target driving voltage which enables an actual measurement brightness value to reach a target brightness value when the display panel displays a target gray scale, wherein the target brightness value is a theoretical brightness value when the display panel displays the target gray scale under a target gamma value;
the brightness detection probe is used for detecting a first actual measurement brightness value of the first display area and a second actual measurement brightness value of the second display area in the process of driving the display panel to display the target gray scale by adopting the target driving voltage;
the detection circuit is further configured to determine a first measured gamma value of the first display area based on the first measured brightness value, determine a second measured gamma value of the second display area based on the second measured brightness value, and determine whether the display panel is qualified based on a difference between the first measured gamma value and the second measured gamma value.
Optionally, the detection circuit is configured to:
if the difference value of the first measured gamma value and the second measured gamma value is smaller than or equal to a difference threshold value, determining that the display panel is qualified;
and if the difference value of the first measured gamma value and the second measured gamma value is larger than the difference threshold value, determining that the display panel is unqualified.
Optionally, the detection circuit is configured to drive the display panel to display the target gray scale by using a plurality of different reference driving voltages;
the brightness detection probe is used for detecting the actually measured brightness value of any one of the first display area and the second display area in the process of driving the display panel to display the target gray scale by adopting each reference driving voltage;
the detection circuit is further configured to determine, as a target driving voltage, one of the plurality of different reference driving voltages, where a difference between a measured luminance value of any one of the display regions and the target luminance value is smaller than an error threshold.
Optionally, the target brightness value L i Satisfies the following conditions:
Figure BDA0003773993670000031
wherein i is the target gray scale, m is the maximum gray scale that can be displayed by the display panel, and L m The brightness value of any display area when displaying the maximum gray scale, n is the minimum gray scale that can be displayed by the display panel, and L n The gamma is the target gamma value, which is the brightness value of any display area when the minimum gray scale is displayed.
Optionally, the target gamma value is 2.2.
Optionally, the areas of the first display region and the second display region are equal;
the first measured brightness value is a measured brightness value of a first reference point in the first display area, and the second measured brightness value is a measured brightness value of a second reference point in the second display area.
Optionally, the first reference point is a center point of the first display area, and the second reference point is a center point of the second display area.
Optionally, the target gray level is 208.
In yet another aspect, a detection circuit is provided, the detection circuit comprising: a processor and a memory, the memory having stored therein instructions that are loaded and executed by the processor to implement the method of detecting a display panel as provided in the above aspect.
In yet another aspect, a computer-readable storage medium is provided, in which instructions are stored, the instructions being loaded and executed by a processor to implement the detection method of the display panel provided in the above aspect.
In a further aspect, there is provided a computer program product comprising computer instructions loaded and executed by a processor to implement the method of detecting a display panel as provided in the above aspect.
The beneficial effect that technical scheme that this application provided brought includes at least:
the application provides a detection method and a detection device for a display panel, wherein the method can detect the actually measured brightness values of a first display area and a second display area in the display panel when a target driving voltage is adopted to drive the display panel to display a target gray scale. Then, the actually measured gamma values of the two display areas can be determined based on the actually measured brightness values of the first display area and the second display area, and whether the display panel is qualified or not can be detected based on the difference value of the actually measured gamma values of the two display areas. The actually measured gamma values of the two display areas are determined based on the actually measured brightness values of the two display areas, so that the display performance of the display panel can be accurately detected. Furthermore, the display panels entering the next process can be guaranteed to be display panels with qualified display performance, so that the yield of the prepared display device is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an inspection system for a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart illustrating a method for inspecting a display panel according to an embodiment of the present disclosure;
FIG. 3 is a schematic flowchart illustrating another method for inspecting a display panel according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a gray scale and gamma value curve of a display panel according to an embodiment of the present disclosure;
FIG. 5 is a graph illustrating gray scale and gamma of another display panel according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating gamma separation of a display panel in a Cell process and an MDL process according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a detection circuit in a detection apparatus according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an inspection system for a display panel provided in an embodiment of the present application, and referring to fig. 1, the inspection system includes: a display panel 10 to be inspected and a detection device 20.
The display panel 10 may be a display panel obtained by Cell manufacturing in the manufacturing process of the display device. As shown in fig. 1, the display panel 10 may include at least one display region. For example, referring to fig. 1, the display panel 10 includes a first display area A1 and a second display area A2.
The detecting device 20 is used for detecting the display panel 10 to determine whether the display performance of the display panel 10 is qualified. If the detecting device 20 detects that the display performance of the display panel 10 is qualified (OK), it can be determined that the display panel 10 can enter the next process (i.e., MDL process). If the detecting device 20 detects that the display performance of the display panel 10 is Not Good (NG), it can determine that the display panel 10 cannot enter the MDL process. Alternatively, the display performance of the display panel 10 may be the uniformity of the display brightness of each display area when the display panel 10 displays gray scales.
It can be understood that by intercepting the NG display panel in the Cell process, the material waste caused by the NG display panel entering the MDL process can be avoided, thereby reducing the production cost in the manufacturing process of the batch display device.
Referring to fig. 1, the detecting device 20 may include a detecting circuit 21 and a brightness detecting probe 22. The detection circuit 21 is used for providing a driving voltage to the display panel 10 to drive the display panel 10 to display a specified gray scale. The brightness detection probe 22 is used for detecting the brightness value of the display panel 10 and transmitting the detected brightness value to the detection circuit 21. The detection circuit 21 can further detect the uniformity of the display brightness of the display panel 10 based on the brightness value. Alternatively, the detecting device 20 may include a plurality of brightness detecting probes 22, and the number of the brightness detecting probes 22 may be positively correlated to the number of the display regions included in the display panel 10. For example, if the display panel 10 includes a first display area A1 and a second display area A2, the detecting device 20 may include two brightness detecting probes 22. The two brightness detection probes 22 are respectively used for detecting the brightness values of two display areas in the display panel 10.
The detecting device 20 may also be referred to as an Electrical Test (ET) tool, and a process of detecting the display panel 10 by the detecting device 20 may also be referred to as a Sorting (Sorting) process of the display panel 10.
Alternatively, the display device may be any product or component with a display function, such as a Virtual Reality (VR) device, a liquid crystal display device, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, or a navigator.
For example, the display device may be a VR device, and the VR device may include two display screens, i.e., two display areas of a display panel in the VR device. The VR device may also be referred to as a dual-screen VR device. Due to the limitation of the manufacturing process precision, there may be a large difference in the brightness of the two display areas on the display panel 10 obtained by the middle Cell manufacturing process in the process of manufacturing the dual-screen VR device. Therefore, the display performance of the display panel 10 can be detected by the detection device 20 during the Cell manufacturing process, so as to ensure the yield of the manufactured dual-screen VR device.
Fig. 2 is a schematic flowchart of a method for detecting a display panel according to an embodiment of the present application, where the method may be applied to the detection apparatus 20 in a scenario such as that shown in fig. 1. Referring to fig. 1, the display panel includes a first display area A1 and a second display area A2. As shown in fig. 2, the method includes:
step 101, determining a target driving voltage which enables an actual measurement brightness value of the display panel to reach a target brightness value when the display panel displays a target gray scale.
The detection device is pre-stored with a target brightness value of the display panel when displaying a target gray scale, wherein the target brightness value is a theoretical brightness value of the display panel when displaying the target gray scale under a target gamma value. The detection device can continuously adjust the driving voltage provided by the detection device to the display panel in the process of displaying the target gray scale on the display panel, and collects the actual measurement brightness value of the display panel in real time when the target gray scale is displayed. When the detection device detects that the actually measured brightness value of the display panel reaches the target brightness value, the driving voltage currently provided to the display panel can be determined as the target driving voltage.
The target gray scale may be any gray scale in a gray scale range that can be displayed by the display panel, for example, the target gray scale may be a gray scale higher than a gray scale threshold in the gray scale range, that is, a higher gray scale in the gray scale range. It can be understood that if there is a difference in display performance (i.e. there is a large difference in gamma value) between different display areas of the display panel, when the different display areas are driven by the same driving voltage to display the same gray scale, the brightness difference between the different display areas is larger as the gray scale is increased. Based on this, the heightened gray scale can be adopted as the target gray scale so as to accurately detect the difference of the display brightness of different display areas.
For example, assuming that the display panel is an 8-bit (bit) panel, the display panel can display 2 8 =256 levels of gray scale, i.e., the display panel can display 0 to 255 gray scale. Accordingly, the target gray level may be any one of gray levels from 0 to 255, for example, the target gray level may be 208.
Step 102, in the process of driving the display panel to display the target gray scale by adopting the target driving voltage, detecting a first actual measurement brightness value of the first display area and a second actual measurement brightness value of the second display area.
In the embodiment of the application, after the detection device determines the target driving voltage, the detection device can drive the display panel to display the target gray scale by using the target driving voltage. In the process that the display panel displays the target gray scale, the detection device can detect a first actual measurement brightness value of a first display area and a second actual measurement brightness value of a second display area in the display panel.
When detecting the actual measurement brightness value of any one of the first display area and the second display area, the detection device may collect the brightness values of a plurality of pixel points in any one of the display areas, and determine the average value of the brightness values of the plurality of pixel points as the actual measurement brightness value of any one of the display areas. For example, the plurality of pixels may be some or all of the pixels in any one of the display regions. Alternatively, the detecting device may only collect a brightness value of a preset reference point in any one of the display areas, and determine the brightness value of the reference point as an actually measured brightness value of any one of the display areas. For example, the reference point may be any vertex of the display area, or may be a geometric center point of the display area.
Step 103, determining a first measured gamma value of the first display area based on the first measured brightness value.
In the embodiment of the present application, the detection device stores a corresponding relationship (e.g., a functional relationship) between the gamma value and the brightness value in advance. The detection device can determine a first measured gamma value corresponding to the first measured brightness value based on the corresponding relationship.
And 104, determining a second measured gamma value of the second display area based on the second measured brightness value.
Referring to step 103, the detection device can determine a second measured gamma value corresponding to the second measured brightness value based on the pre-stored correspondence between the gamma value and the brightness value.
And 105, determining whether the display panel is qualified or not based on the difference value of the first measured gamma value and the second measured gamma value.
It can be understood that, since the first measured gamma value and the second measured gamma value are determined based on the corresponding relationship between the gamma value and the brightness value, the size of the difference between the first measured gamma value and the second measured gamma value can reflect the uniformity of the display brightness of the first display area and the second display area in the display panel. That is, the display performance of the display panel can be reflected.
It can also be understood that, when the difference between the first measured gamma value and the second measured gamma value is large, the detection device can determine that the difference between the display brightness of the first display area and the display brightness of the second display area in the display panel is large, and the uniformity of the display brightness of the display panel is poor. Accordingly, the inspection device may determine that the display panel is defective. When the difference value between the first actually measured gamma value and the second actually measured gamma value is small, the detection device can determine that the difference between the display brightness of the first display area and the display brightness of the second display area in the display panel is small, and the uniformity of the display brightness of the display panel is good. Accordingly, the detection device can determine that the display panel is qualified.
In summary, the embodiments of the present application provide a method for detecting a display panel, which can detect actual measurement luminance values of a first display area and a second display area in the display panel when a target driving voltage is used to drive the display panel to display a target gray scale. Then, the measured gamma values of the two display areas can be determined based on the measured brightness values of the first display area and the second display area, and whether the display panel is qualified or not can be detected based on the difference value of the measured gamma values of the two display areas. Because the actually measured gamma values of the two display areas are determined based on the actually measured brightness values of the two display areas, the uniformity of the display brightness of the display panel can be accurately detected. Furthermore, the display panels entering the next process can be guaranteed to be display panels with qualified display performance, so that the yield of the prepared display device is high.
Fig. 3 is a schematic flowchart of another display panel detection method provided in this embodiment of the present application, which may be applied to a display panel detection apparatus, such as the detection apparatus 20 in the scenario shown in fig. 1. Referring to fig. 1, the display panel includes a first display area A1 and a second display area A2. As shown in fig. 3, the method includes:
step 201, driving the display panel to display the target gray scale by using a plurality of different reference driving voltages.
In this embodiment, the detection device may select a reference driving voltage, and continuously adjust a voltage value of the reference driving voltage, so as to obtain a plurality of different reference driving voltages. Then, the detection device can drive the display panel to display the target gray scale by adopting the plurality of different reference driving voltages.
For example, the reference driving voltage selected by the detection device may have a voltage value of 0 volt (V). The detection device can gradually increase the voltage value of the reference driving voltage according to a certain voltage amplification, thereby obtaining a plurality of reference driving voltages. Then, the detection device may sequentially drive the display panel to display the target gray scale by using the plurality of reference driving voltages according to the order of the voltage values from small to large.
The target gray scale may be any gray scale in a gray scale range that can be displayed by the display panel, for example, a gray scale higher than a gray scale threshold in the gray scale range, that is, a higher gray scale in the gray scale range. It can be understood that if there is a difference in display performance (i.e. there is a large difference in gamma value) between different display areas of the display panel, when the different display areas are driven by the same driving voltage to display the same gray scale, the brightness difference between the different display areas is larger as the gray scale is increased. Based on this, the heightened gray scale can be adopted as the target gray scale so as to accurately detect the difference of the display brightness of different display areas.
For example, assuming that the display panel is an 8-bit panel, the display panel can display 256 levels of gray scales, i.e., the display panel can display 0 to 255 gray scales. Accordingly, the target gray level may be any one of gray levels from 0 to 255, for example, the target gray level may be 208.
Step 202, in the process of driving the display panel to display the target gray scale by using each reference driving voltage, detecting an actually measured brightness value of any one of the first display area and the second display area.
The detection device can also detect the actual measurement brightness value of any one of the first display area and the second display area in the process of driving the display panel to display the target gray scale by adopting each reference driving voltage. And, the measured brightness value may be positively correlated with the voltage value of the reference driving voltage. That is, when the detecting device gradually increases the voltage value of the reference driving voltage, the actually measured brightness value of any one of the display regions also gradually increases.
It can be understood that, when the detection apparatus drives the display panel to display the target gray scale by using each reference driving voltage, the measured brightness values of the first display area and the second display area in the display panel may be the same or different. The areas of the first display area and the second display area may be equal, and the detection device may detect an actually measured brightness value of any one of the two display areas.
Optionally, when the detection device detects the actually measured luminance value of any one of the first display region and the second display region, the detection device may collect luminance values of a plurality of pixel points in the any one of the display regions, and determine an average value of the luminance values of the plurality of pixel points as the actually measured luminance value of the any one of the display regions. For example, the plurality of pixels may be some or all of the pixels in any one of the display regions. Alternatively, the detecting device may only collect a brightness value of a preset reference point in any one of the display areas, and determine the brightness value of the reference point as an actually measured brightness value of any one of the display areas. For example, the reference point may be any vertex of any display area, or may be a geometric center point of any display area.
Step 203, determine a reference driving voltage, which is a difference between a measured luminance value and a target luminance value of any display region smaller than an error threshold, as a target driving voltage among the plurality of different reference driving voltages.
In this embodiment of the application, after detecting the measured brightness value of any one of the first display area and the second display area, the detecting device may detect whether a difference between the measured brightness value and the target brightness value is smaller than an error threshold. When the detection device detects that the difference between the actual measurement brightness value and the target brightness value is smaller than the error threshold, it may be determined that the actual measurement brightness value reaches the target brightness value, and the reference driving voltage currently provided to the display panel is determined as the target driving voltage. When the detecting device detects that the difference between the actual measurement brightness value and the target brightness value is greater than or equal to the error threshold, different reference driving voltages can be continuously provided for the display panel until the difference between the actual measurement brightness value and the target brightness value is smaller than the error threshold.
The target brightness value is a theoretical brightness value of the display panel when displaying a target gray scale under a target gamma value, and the target brightness value can be determined according to a corresponding relationship between the gamma value and the brightness value. Optionally, the target brightness value L i Can satisfy the following conditions:
Figure BDA0003773993670000101
wherein i is a target gray scale, m is a maximum gray scale that can be displayed by the display panel, and L m Is the brightness value of any display region when displaying the maximum gray scale, n is the minimum gray scale that the display panel can display, L n Is the brightness value, gamma, of any display region when displaying the minimum gray scale 1 Is the target gamma value. Wherein the target gamma value may be 2.2.
It is understood that the brightness value of any one display region when displaying the maximum gray scale and the brightness value when displaying the minimum gray scale may be the brightness value stored in the detection device in advance. The brightness value of the display panel when displaying the maximum gray scale can be a theoretical brightness value of the display panel when displaying the maximum gray scale under a target gamma value, and the brightness value of the display panel when displaying the minimum gray scale is the theoretical brightness value of the display panel when displaying the minimum gray scale under the target gamma value.
For example, when the display panel is an 8-bit panel, the display panel can display 2 8 =256 levels of gray scale, the maximum gray scale m that the display panel can display is 255, and the minimum gray scale n is 0. The target gray level i may be 208.
Step 204, in the process of driving the display panel to display the target gray scale by using the target driving voltage, detecting a first actual measurement brightness value of the first display area and a second actual measurement brightness value of the second display area.
In the embodiment of the application, after the detection device determines the target driving voltage, the detection device can drive the display panel to display the target gray scale by using the target driving voltage. In the process that the display panel displays the target gray scale, the detection device can detect a first actual measurement brightness value of a first display area and a second actual measurement brightness value of a second display area in the display panel.
Optionally, the first measured brightness value may be a measured brightness value of a first reference point in the first display area, and the second measured brightness value may be a measured brightness value of a second reference point in the second display area. That is, the detection device may only detect the actual measurement brightness values of the reference points in the two display areas, and use the actual measurement brightness values of the reference points as the actual measurement brightness values of the display areas where the reference points are located.
For example, the first reference point may be a center point of the first display region, and the second reference point may be a center point of the second display region.
Step 205 determines a first measured gamma value for the first display region based on the first measured brightness value.
In the embodiment of the present application, the detection device stores a corresponding relationship between a gamma value and a brightness value in advance. The detection device can determine a first measured gamma value corresponding to the first measured brightness value based on the corresponding relationship.
Optionally, the gamma value γ and the brightness value L i The correspondence of (a) may be a functional relationship. For example, the functional relationship may be:
Figure BDA0003773993670000111
alternatively, when the display panel is an 8-bit panel, the display panel can display 256 levels of gray scale. FIG. 4 is a schematic diagram of the change of the first measured gamma value and the second measured gamma value with the target gray scale. In fig. 4, the horizontal axis represents the target gray scale and the vertical axis represents the measured gamma value. In fig. 4, the lower gamma limit is the minimum value of the actually measured gamma value of the display panel when displaying the target gray scale. The gamma upper limit is the maximum value of the actually measured gamma value of the display panel when the target gray scale is displayed. As shown in FIG. 4, when the target gray level is 208, the first measured gamma value may be 2.05.
Step 206, determining a second measured gamma value of the second display area based on the second measured brightness value.
Referring to step 205, the detecting device can determine the second measured gamma value corresponding to the second measured brightness value based on the corresponding relationship between the gamma value and the brightness value stored in advance.
For example, referring to the schematic diagram of fig. 4 that the second measured gamma value varies with the target gray level, when the target gray level is 208, the second measured gamma value may be 2.4.
Step 207, detecting whether the difference between the first measured gamma value and the second measured gamma value is less than or equal to a difference threshold.
In this application embodiment, detection device is after confirming first actual measurement gamma value and second actual measurement gamma value, can detect whether this first actual measurement gamma value and second actual measurement gamma value's difference is less than or equal to predetermined difference threshold value, and then confirms whether this display panel is qualified.
When the detection device determines that the difference between the first measured gamma value and the second measured gamma value is smaller than or equal to the preset difference threshold, the following step 208 may be executed. When the detecting means determines that the difference between the first measured gamma value and the second measured gamma value is greater than the preset difference threshold, the following step 209 may be executed.
Alternatively, the difference threshold may be predetermined based on display performance requirements of the display panel. For example, when the display performance requirement of the display panel is higher, the value of the difference threshold may be smaller.
It can be understood that, since the first measured gamma value and the second measured gamma value are determined based on the corresponding relationship between the gamma value and the brightness value, the size of the difference between the first measured gamma value and the second measured gamma value can reflect the uniformity of the display brightness of the first display area and the second display area in the display panel. That is, the display performance of the display panel can be reflected.
Referring to fig. 4, when the target gray scale displayed on the display panel is smaller, the difference between the first measured gamma value and the second measured gamma value is smaller. When the target gray scale displayed by the display panel is larger, the difference value between the first measured gamma value and the second measured gamma value is larger. The detection device can set the value of the target gray scale and the value of the difference threshold value based on the requirement of the display performance of the display panel. For example, the target gray level may be 208, and correspondingly, the difference threshold may be 0.4.
And step 208, determining that the display panel is qualified.
In step 207, if the detecting device detects that the difference between the first measured gamma value and the second measured gamma value is smaller than or equal to the preset difference threshold, it may determine that the display panel is qualified.
It can be understood that, when the difference between the first measured gamma value and the second measured gamma value is smaller, the detection apparatus can determine that the difference between the display brightness of the first display area and the display brightness of the second display area in the display panel is smaller, and the uniformity of the display brightness of the display panel is better. Accordingly, the inspection apparatus may determine that the display panel is qualified and may determine that the display panel may enter a next process (e.g., MDL process).
For example, if the target gray level is 208, the variance threshold is 0.4. Referring to fig. 4, when the display panel displays 208 gray levels, the first measured gamma value is 2.05, the second measured gamma value is 2.4, and the difference between the first measured gamma value and the second measured gamma value is 0.35. The difference is less than a difference threshold and the detection means may determine that the display panel is acceptable.
And step 209, determining that the display panel is unqualified.
In step 207, if the detecting device detects that the difference between the first measured gamma value and the second measured gamma value is greater than the preset difference threshold, it may determine that the display panel is qualified.
It can be understood that, when the difference value between the first measured gamma value and the second measured gamma value is greater than the difference threshold, the detection device can determine that the difference between the display brightness of the first display area and the display brightness of the second display area in the display panel is greater, and the uniformity of the display brightness of the display panel is poor. Accordingly, the inspection apparatus can determine that the display panel is not qualified (i.e., NG), and determine that the display panel cannot enter the next MDL process.
For example, referring to fig. 5, if the first measured gamma value is 1.98 and the second measured gamma value is 2.56 when the display panel displays 208 gray levels, the difference between the first measured gamma value and the second measured gamma value is 0.58. The difference is greater than the difference threshold, and the detection device may determine that the display panel is not acceptable.
It can be understood that, when the Cell process accurately detects the uniformity of the display brightness of the display panel, it can be ensured that the display panels entering the MDL process are all display panels with qualified display performance, so as to ensure that the manufactured display device has high yield. Moreover, by intercepting the NG display panel in the Cell process, the material waste caused by the NG display panel entering the MDL process can be avoided, and the production cost in the manufacturing process of the batch display device is further reduced.
Fig. 6 is a graph showing a distribution of differences between first and second measured gamma values of a plurality of qualified display panels in a Cell process and a distribution of differences between first and second measured gamma values of a plurality of qualified display panels in an MDL process. In fig. 6, the horizontal axis represents the number of the display panel, and the vertical axis represents the difference between the first measured gamma value and the second measured gamma value of the display panel. The difference between the first measured gamma value and the second measured gamma value can also be referred to as the gamma separation amount of the display panel.
Referring to fig. 6, it can be seen that, by using the method provided in the embodiment of the present application, the display performance of the plurality of display panels is detected in the Cell process, and after the plurality of unqualified display panels determined in the Cell process enter the MDL process, the gamma separation amount of the plurality of qualified display panels entering the MDL process is substantially equal to or close to the gamma separation amount of the plurality of qualified display panels in the Cell process. That is, the gamma separation amount of the plurality of qualified display panels in the MDL process is matched with the gamma separation amount of the plurality of qualified display panels in the Cell process.
It can be understood that the sequence of the steps of the detection method for the display panel provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. For example, steps 205 and 206 described above may be performed simultaneously, or step 206 may be performed before step 205. Any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application is covered by the protection scope of the present application, and thus the detailed description thereof is omitted.
In summary, the embodiments of the present application provide a method for detecting a display panel, which can detect actual measurement luminance values of a first display area and a second display area in the display panel when a target driving voltage is used to drive the display panel to display a target gray scale. Then, the measured gamma values of the two display areas can be determined based on the measured brightness values of the first display area and the second display area, and whether the display panel is qualified or not can be detected based on the difference value of the measured gamma values of the two display areas. The actually measured gamma values of the two display areas are determined based on the actually measured brightness values of the two display areas, so that the display performance of the display panel can be accurately detected. Furthermore, the display panels entering the next process can be guaranteed to be display panels with qualified display performance, so that the yield of the prepared display device is high.
The embodiment of the present application provides a detection apparatus for a display panel, as shown in fig. 1, the display panel 10 includes a first display area A1 and a second display area A2, and the detection apparatus 20 may include a detection circuit 21 and a brightness detection probe 22.
The detection circuit 21 is configured to determine a target driving voltage that enables an actual measurement brightness value of the display panel 10 when displaying a target gray scale to reach a target brightness value, where the target brightness value is a theoretical brightness value of the display panel 10 when displaying the target gray scale at a target gamma value.
The brightness detection probe 22 is configured to detect a first actual measurement brightness value of the first display area A1 and a second actual measurement brightness value of the second display area A2 in a process of driving the display panel 10 with the target driving voltage to display the target gray scale.
The detection circuit 21 is further configured to determine a first measured gamma value of the first display area A1 based on the first measured brightness value, determine a second measured gamma value of the second display area A2 based on the second measured brightness value, and determine whether the display panel 10 is qualified based on a difference between the first measured gamma value and the second measured gamma value.
Optionally, the detection circuit 21 is configured to:
if the difference between the first measured gamma value and the second measured gamma value is less than or equal to the difference threshold, the display panel 10 is determined to be qualified.
If the difference between the first measured gamma value and the second measured gamma value is greater than the difference threshold, it is determined that the display panel 10 is not qualified.
Optionally, the detection circuit is configured to drive the display panel 10 to display a target gray scale by using a plurality of different reference driving voltages.
The brightness detection probe 22 is configured to detect a measured brightness value of any one of the first display area A1 and the second display area A2 in a process of driving the display panel 10 to display a target gray scale by using each reference driving voltage.
The detection circuit 21 is further configured to determine, as the target driving voltage, one of the plurality of different reference driving voltages, which is a reference driving voltage having a difference between a measured luminance value of any one of the display regions and a target luminance value smaller than an error threshold.
Optionally, the target brightness value L i Satisfies the following conditions:
Figure BDA0003773993670000151
wherein i is a target gray scale, m is a maximum gray scale that can be displayed by the display panel, and L m Is the brightness value of any display region when displaying the maximum gray scale, n is the minimum gray scale that the display panel can display, L n Gamma is a target gamma value, which is a luminance value of any display region when displaying the minimum gray scale.
Optionally, the target gamma value is 2.2.
Alternatively, the areas of the first display region A1 and the second display region A2 are equal. The first measured brightness value is a measured brightness value of a first reference point in the first display area A1, and the second measured brightness value is a measured brightness value of a second reference point in the second display area A2.
Optionally, the first reference point is a center point of the first display area A1, and the second reference point is a center point of the second display area A2.
Optionally, the target gray level is 208.
To sum up, the embodiment of the present application provides a detection apparatus for a display panel, which is capable of detecting actual measurement brightness values of a first display area and a second display area in the display panel when a target driving voltage is used to drive the display panel to display a target gray scale. Then, the measured gamma values of the two display areas can be determined based on the measured brightness values of the first display area and the second display area, and whether the display panel is qualified or not can be detected based on the difference value of the measured gamma values of the two display areas. Because the actually measured gamma values of the two display areas are determined based on the actually measured brightness values of the two display areas, the uniformity of the display brightness of the display panel can be accurately detected. Furthermore, the display panels entering the next process can be guaranteed to be display panels with qualified display performance, so that the yield of the prepared display device is high.
It is to be understood that the detection apparatus for a display panel provided in the foregoing embodiment is only illustrated by the division of the functional modules, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the detection apparatus is divided into different functional modules to complete all or part of the functions described above.
In addition, the embodiments of the detection apparatus for a display panel and the detection method for a display panel provided by the embodiments belong to the same concept, and specific implementation processes thereof are detailed in the embodiments of the methods and are not described herein again.
The embodiment of the present application further provides a detection circuit of a detection apparatus, as shown in fig. 7, the detection circuit may include a processor 211 and a memory 212, where the memory 212 stores instructions, and the instructions are loaded and executed by the processor 211 to implement the detection method (for example, the method shown in fig. 2 or fig. 3) of the display panel executed by the detection circuit 21 in the above method embodiment.
The embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the storage medium, and the instructions are loaded and executed by a processor to implement the method for detecting a display panel (for example, the method shown in fig. 2 or fig. 3) provided by the foregoing method embodiment.
The embodiment of the present application further provides a computer program product or a computer program, where the computer program product or the computer program includes computer instructions, which are loaded and executed by a processor to implement the method for detecting a display panel (for example, the method shown in fig. 2 or fig. 3) provided by the above method embodiment.
It is to be understood that the term "at least one" in this application refers to one or more, and the meaning of "a plurality" refers to two or more.
The terms "first," "second," and the like in this application are used for distinguishing between similar items and items that have substantially the same function or similar functionality, and it should be understood that "first," "second," and "nth" do not have any logical or temporal dependency or limitation on the number or order of execution.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and is not intended to limit the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The detection method of the display panel is characterized in that the display panel comprises a first display area and a second display area; the method comprises the following steps:
determining a target driving voltage which enables an actually measured brightness value of the display panel to reach a target brightness value when the display panel displays a target gray scale, wherein the target brightness value is a theoretical brightness value of the display panel when the display panel displays the target gray scale under a target gamma value;
detecting a first actual measurement brightness value of the first display area and a second actual measurement brightness value of the second display area in the process of driving the display panel to display the target gray scale by using the target driving voltage;
determining a first measured gamma value for the first display region based on the first measured brightness value;
determining a second measured gamma value for the second display region based on the second measured brightness value;
and determining whether the display panel is qualified or not based on the difference value of the first measured gamma value and the second measured gamma value.
2. The method of claim 1, wherein determining whether the display panel is qualified based on a difference between the first measured gamma value and the second measured gamma value comprises:
if the difference value between the first measured gamma value and the second measured gamma value is smaller than or equal to a difference threshold value, determining that the display panel is qualified;
and if the difference value of the first measured gamma value and the second measured gamma value is larger than the difference threshold value, determining that the display panel is unqualified.
3. The method of claim 1, wherein determining the target driving voltage that causes the measured luminance value to reach the target luminance value when the display panel displays the target gray scale comprises:
driving the display panel to display the target gray scale by adopting a plurality of different reference driving voltages;
in the process of driving the display panel to display the target gray scale by adopting each reference driving voltage, detecting an actually measured brightness value of any one of the first display area and the second display area;
and determining one reference driving voltage, which enables the difference value between the measured brightness value of any display area and the target brightness value to be smaller than an error threshold value, as the target driving voltage.
4. A method according to any one of claims 1 to 3, whereinThe target brightness value L i Satisfies the following conditions:
Figure FDA0003773993660000021
wherein i is the target gray scale, m is the maximum gray scale that can be displayed by the display panel, and L m The brightness value of any display area when displaying the maximum gray scale, n is the minimum gray scale that can be displayed by the display panel, and L n The gamma is the target gamma value, which is the brightness value of any display area when the minimum gray scale is displayed.
5. The method of any one of claims 1 to 3, wherein the target gamma value is 2.2.
6. A method according to any one of claims 1 to 3, wherein the first display region and the second display region are equal in area;
the first measured brightness value is a measured brightness value of a first reference point in the first display area, and the second measured brightness value is a measured brightness value of a second reference point in the second display area.
7. The method of claim 6, wherein the first reference point is a center point of the first display area, and the second reference point is a center point of the second display area.
8. The method of any of claims 1 to 3, wherein the target gray level is 208.
9. The detection device of the display panel is characterized in that the display panel comprises a first display area and a second display area; the device comprises: a brightness detection probe and a detection circuit;
the detection circuit is used for determining a target driving voltage which enables an actually measured brightness value of the display panel to reach a target brightness value when the display panel displays a target gray scale, wherein the target brightness value is a theoretical brightness value of the display panel when the display panel displays the target gray scale under a target gamma value;
the brightness detection probe is used for detecting a first actual measurement brightness value of the first display area and a second actual measurement brightness value of the second display area in the process of driving the display panel to display the target gray scale by adopting the target driving voltage;
the detection circuit is further configured to determine a first measured gamma value of the first display area based on the first measured brightness value, determine a second measured gamma value of the second display area based on the second measured brightness value, and determine whether the display panel is qualified based on a difference between the first measured gamma value and the second measured gamma value.
10. The apparatus of claim 9, wherein the detection circuit is configured to:
if the difference value of the first measured gamma value and the second measured gamma value is smaller than or equal to a difference threshold value, determining that the display panel is qualified;
and if the difference value of the first measured gamma value and the second measured gamma value is larger than the difference threshold value, determining that the display panel is unqualified.
CN202210911219.1A 2022-07-29 2022-07-29 Display panel detection method and device Pending CN115223469A (en)

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