CN115294902A - Method and device for measuring voltage holding ratio of display panel - Google Patents

Abstract

The present invention provides a method and device for measuring the voltage holding ratio of a display panel. The method includes: determining a corresponding target voltage value on a gamma curve of the display panel according to a target test gray scale; and according to the target voltage value, generating a display voltage signal corresponding to the target test gray scale; under the driving of the display voltage signal, acquiring a brightness change curve of the display panel in the holding stage; determining the brightness change curve of the display panel according to the brightness change curve voltage retention. In the present invention, after the display voltage signal of the display panel is determined, the brightness change curve of the display panel can be measured in the holding stage of the display panel, so that the voltage holding rate of the liquid crystal display panel can be converted into the brightness holding degree, and the brightness change curve of the display panel can be obtained according to the brightness change curve. The voltage holding ratio realizes the convenient and fast measurement of the voltage holding ratio.

Description

Method and device for measuring voltage retention rate of a display panel

technical field

The invention relates to the field of display technology, in particular to a method and device for measuring the voltage retention rate of a display panel.

Background technique

The working principle of the liquid crystal display panel is: under the action of an electric field, the alignment direction of the liquid crystal molecules is changed, so that the light of the light source transparent liquid crystal display panel is changed (modulated), and the electro-optical conversion is completed. The liquid crystal display panel is a multi-layer structure composed of various materials and structures. After the liquid crystal module is assembled into a box, there will be many factors that affect the display effect of the liquid crystal display panel, such as circuit design, thin film transistor (Thin Film Transistor, TFT) device Performance, alignment layer and ions in liquid crystal, etc.

The voltage retention rate of the liquid crystal display panel refers to the degree to which the liquid crystal layer maintains the written voltage during the maintenance phase after writing the display voltage to the liquid crystal layer during the working process of the liquid crystal display panel. Due to the multi-layer structure of the liquid crystal display panel, it involves There are many materials and electrical devices, and it is difficult to conveniently and quickly measure the specific value of the voltage holding ratio (Voltage Holding Ratio, VHR) of the display panel in the prior art.

Contents of the invention

The invention provides a method and device for measuring the voltage retention rate of a display panel, which are used to solve the defects in the prior art and realize convenient and rapid measurement of the voltage retention rate of the display panel.

In a first aspect, the present invention provides a method for measuring the voltage retention rate of a display panel, including: determining a corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale; The display voltage signal corresponding to the target test gray scale; the display voltage signal is a positive and negative square wave voltage signal relative to the reference voltage of the display panel; the voltage of the positive and negative square wave signal is the same as the target voltage value ; Under the drive of the display voltage signal, obtain the brightness change curve of the display panel in the holding stage; the display voltage signal is the driving signal of the display panel input through the data line; according to the brightness change curve, determine the The voltage retention rate of the display panel described above.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, before determining the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale, the method includes: obtaining the voltage of the display panel - Transmittance curve: converting the voltage-transmittance curve of the display panel into a gamma curve according to the gamma value of the display panel.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, the display voltage signal has a high-level phase and a low-level phase; the high-level phase and the low-level phase are alternately switched frame by frame ; The display panel has a charging phase and a holding phase within a frame period driven by the display voltage signal; the holding phase starts after the charging phase ends.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, the display voltage signal at least includes a set of high-level phases and low-level phases, and the low-level phase ends at the high-level phase Then start; the acquisition of the luminance change curve of the display panel in the holding phase under the drive of the display voltage signal includes: acquiring the first luminance change curve of the display panel in the first holding phase, and the The second luminance change curve of the display panel in the second holding stage; the first holding stage is the holding stage of the display panel driven by the high level stage; the second holding stage is the display panel in the second holding stage The holding stage under the low-level stage driving; correspondingly, the determining the voltage holding rate of the display panel according to the brightness change curve includes: according to the first brightness change curve and the second brightness change curve The change curve is used to determine the voltage retention rate of the display panel.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, the determining the voltage retention rate of the display panel according to the first luminance change curve and the second luminance change curve includes: obtaining the The first maintained brightness of the first brightness change curve at the end moment of the first maintenance period, and the first maximum brightness in the first maintenance period; and, acquiring the second brightness change curve at the second the second maintained brightness at the end moment of the maintained phase, and the second maximum brightness in the second maintained phase; according to the first maintained brightness, the first maximum brightness, the second maintained brightness and the second Maximum brightness, which determines the voltage retention of the display panel.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, the determination of the The voltage retention rate of the display panel includes: determining the voltage retention rate according to the average value of the first optical voltage retention rate and the second optical voltage retention rate; the first optical voltage retention rate is the first maintained brightness Ratio to the first maximum brightness; the second optical voltage retention rate is a ratio of the second maintained brightness to the second maximum brightness.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, determining the voltage retention rate of the display panel according to the first luminance change curve and the second luminance change curve further includes: Integrating the first luminance change curve in the first holding stage to obtain a first luminance integral; and integrating the first maximum luminance in the first holding stage to obtain a first constant luminance integral ; Integrating the second luminance change curve in the second holding stage to obtain a second luminance integral; and integrating the second maximum luminance in the second holding stage to obtain a second constant luminance Integrate; determine the voltage retention rate according to the average value of the third optical voltage retention rate and the fourth optical voltage retention rate; the third optical voltage retention rate is the first luminance integral and the first constant luminance integral The ratio of the fourth optical voltage retention rate is the ratio of the second luminance integral to the second constant luminance integral.

According to a method for measuring the voltage retention rate of a display panel provided by the present invention, when the full grayscale of the display panel is 0 to 255, the target test grayscale is 127.

In a second aspect, the present invention also provides a device for measuring the voltage retention rate of a display panel, including:

The first module is used to determine the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale;

The second module is configured to generate a display voltage signal corresponding to the target test gray scale according to the target voltage value; the display voltage signal is a positive and negative square wave voltage signal relative to the reference voltage of the display panel; the positive The voltage of the negative square wave signal is the same as the target voltage value;

The third module is configured to acquire the luminance change curve of the display panel in the holding phase under the drive of the display voltage signal; the display voltage signal is a driving signal of the display panel input through the data line;

The fourth module is configured to determine the voltage retention rate of the display panel according to the brightness change curve.

In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the program, any of the above-mentioned The steps of the method for measuring the voltage retention rate of the display panel.

In a fourth aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the measurement of the voltage retention rate of the display panel as described in any one of the above is realized. method steps.

The method and device for measuring the voltage retention rate of the display panel provided by the present invention can measure the luminance change curve in the maintenance stage of the display panel after determining the display voltage signal of the display panel, so that the voltage retention rate of the liquid crystal display panel can be converted to In order to maintain the brightness, the voltage retention rate of the display panel is obtained according to the brightness change curve, and the convenient and rapid measurement of the voltage retention rate is realized.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings based on these drawings without creative effort.

1 is a schematic flow chart of a method for measuring the voltage retention rate of a display panel provided by the present invention;

2 is a schematic diagram of a gamma curve of a display panel provided by the present invention;

Fig. 3 is the waveform schematic diagram of the display voltage signal provided by the present invention;

Fig. 4 is a schematic diagram of the instrument and equipment used for optical VHR measurement provided by the present invention;

5 is a schematic diagram of a simplified driving model of a liquid crystal display panel provided by the present invention;

6 is a schematic waveform diagram of a square wave driving signal used for voltage-transmittance measurement provided by the present invention;

Fig. 7 is a schematic diagram of the voltage-transmittance curve provided by the present invention;

Fig. 8 is a schematic diagram of the optical VHR extremum calculation method provided by the present invention;

Fig. 9 is a schematic diagram of an optical VHR integral calculation method provided by the present invention;

10 is a schematic structural diagram of a measuring device for voltage retention of a display panel provided by the present invention;

Fig. 11 is a schematic structural diagram of an electronic device provided by the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that, in the description of the embodiments of the present invention, the terms "comprising", "comprising" or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article or device comprising a series of elements Not only those elements are included, but also other elements not expressly listed or inherent in such process, method, article or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element. The orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must Having a particular orientation, being constructed and operating in a particular orientation, and therefore not to be construed as limiting the invention. Unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The terms "first", "second" and the like in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein, and that references to "first," "second," etc. distinguish Objects are generally of one type, and the number of objects is not limited. For example, there may be one or more first objects.

The method and device for measuring the voltage retention rate of the display panel provided by the embodiments of the present invention will be described below with reference to FIGS. 1-11 .

Fig. 1 is a schematic flowchart of a method for measuring the voltage retention rate of a display panel provided by the present invention, as shown in Fig. 1 , including but not limited to the following steps:

Step 101: According to the target test gray scale, determine the corresponding target voltage value on the gamma curve of the display panel.

Optionally, in the case that the full gray scale of the display panel is 0 to 255, the target test gray scale may be 127. The display panel may be a liquid crystal display panel.

Fig. 2 is a schematic diagram of the gamma curve of the display panel provided by the present invention. The gamma curve is the gray scale-voltage curve of the display panel. In the case of determining the gray scale of the target test, it can be on the gray scale-voltage curve Determine the target voltage value corresponding to the target test gray scale.

Optionally, a method for obtaining a gamma curve includes: obtaining a voltage-transmittance curve (VT curve) of the display panel; The transmittance curve is converted into a gamma curve (Gamma curve). Wherein, the gamma value is generally taken as 2.2.

Step 102: Generate a display voltage signal corresponding to the target test gray scale according to the target voltage value.

FIG. 3 is a schematic waveform diagram of a display voltage signal provided by the present invention. As shown in FIG. 3 , the reference voltage is the Vcom voltage of the display panel. The display voltage signal is a positive and negative square wave voltage signal relative to the Vcom voltage; the voltage magnitude of the positive and negative square wave signal (relative to the reference voltage) is the same as the target voltage value.

Optionally, the display voltage signal has a high-level phase and a low-level phase; the voltage in the high-level phase is v1, and the voltage in the low-level phase is v2.

The high-level phase and the low-level phase are alternately switched frame by frame; that is, after a high-level phase lasts for one frame period, it is switched to a low-level phase; after the low-level phase lasts for one frame period, it is switched It is a high-level stage, which alternates in turn.

Step 103: Driven by the display voltage signal, acquire a brightness change curve of the display panel in a holding phase.

The display panel has a charging phase and a holding phase within a frame period driven by the display voltage signal; the holding phase starts after the charging phase ends.

It should be noted that the display voltage signal is a driving signal of the display panel input through the data line. The display voltage signal acts on the liquid crystal layer through the data line during the charging phase, but because the TFT disconnects the connection with the liquid crystal layer during the holding phase, although the display voltage signal is still loaded on the data, it does not act on the liquid crystal layer . The specific mechanism of action is described in more detail in the following examples.

Step 104: Determine the voltage retention rate of the display panel according to the brightness change curve.

The luminance change curve reflects the luminance change of the display panel in the maintenance stage, and the present invention can calculate the voltage retention rate of the display panel according to the luminance change curve

It should be noted that there may be one or more brightness change curves here. That is, one brightness change curve can be obtained in one maintaining stage, and multiple corresponding brightness change curves can be obtained in multiple maintaining stages.

According to a luminance change curve, the voltage retention rate of the display panel can be calculated. Preferably, the present invention can use multiple brightness change curves to respectively obtain multiple voltage retention rates, and then average the multiple voltage retention rates, and use the final average value as the final voltage retention rate.

The method for measuring the voltage retention rate of the display panel provided by the present invention can measure its brightness change curve in the maintenance stage of the display panel after determining the display voltage signal of the display panel, so that the voltage retention rate of the liquid crystal display panel can be converted into brightness According to the degree of retention, the voltage retention rate of the display panel is obtained according to the brightness change curve, which realizes the convenient and rapid measurement of the voltage retention rate.

The present invention uses an optical method to measure the voltage retention rate of the liquid crystal display panel, which means that the thin film transistor (TFT) of the liquid crystal display panel is turned on, and after writing the voltage corresponding to the brightness to be displayed, the brightness displayed on the panel reaches the target brightness; stage, the brightness of the liquid crystal display panel gradually decreases, so that the voltage retention rate of the liquid crystal display panel can be converted into the degree of brightness retention (the measurement method is referred to as optical VHR measurement method).

In order to better describe the optical VHR measurement method provided by the present invention, the basic instrument and equipment used in the application of the method will be described first. Fig. 4 is the schematic diagram of the instrument and equipment used for optical VHR measurement provided by the present invention, as shown in Fig. 4, the integrated instrument and equipment used in the present invention includes: light receiving unit, liquid crystal display panel, drive unit and measurement and control system and data processing unit.

The liquid crystal display panel needs to be processed in advance, leading out the Vcom, Data, and Gate points of the liquid crystal display panel module and connecting the test cable to facilitate connection with other instruments and equipment. The liquid crystal display panel is a complete liquid crystal display panel module under test, and it is necessary to provide a stable and reliable backlight to provide a light source for the liquid crystal display panel. After the light source passes through the LCD panel module, a light receiving unit is used on the front side to measure the screen brightness of the LCD panel. It should be noted that the sampling rate of the brightness value of the light receiving unit is at least 10 kSPS. Optionally, the light receiving unit in the present invention adopts a sampling rate above 100 kSPS to achieve a better effect.

Fig. 5 is a schematic diagram of a simplified driving model of a liquid crystal display panel provided by the present invention. Referring to Fig. 5, the drive unit of the present invention can provide the TFT operating state voltage of the liquid crystal display panel, including VGH voltage, VGL voltage, Gate signal voltage, GND voltage, and the Vcom voltage and Data signal voltage of the LCD panel. Among them, DC means a direct current power supply, and AC means an alternating current power supply.

Among them, VGH is the voltage required to turn on the TFT, and VGL is the voltage required to turn off the TFT. When the Gate signal line needs to provide a driving signal to the liquid crystal layer through the Data signal line, the VGH voltage is applied, that is, the TFT operation is turned on. When it is necessary to disconnect the Data and When the liquid crystal layer is connected, the Gate signal line supplies VGL voltage; GND is the reference voltage of the circuit, and Vcom is the reference voltage of the liquid crystal layer. The Data signal line (data line) loads the display voltage signal that needs to be written into the liquid crystal layer. In order to prevent polarization, it is usually a positive and negative square wave signal relative to the Vcom voltage.

The measurement and control system and the data processing unit can be composed of a data acquisition card and a computer to provide optical data collection and data processing functions, wherein the measurement and control system and the data processing unit make the brightness signal collected by the light receiving unit be adjusted and converted into digital The signal is provided to the measurement and control system and data processing unit for recording and processing through a suitable communication mode. Commonly used communication modes include USB, network port, etc. Data processing can be processed by general commercial data processing software, or self-written data acquisition and analysis software to process.

Optionally, the present invention can also use other instruments and equipment to provide the required signal and brightness data collection functions, as long as the functions of the various instruments and equipment in the above embodiments can be realized. For example, the present invention can use a photomultiplier tube (photomultiplier tube, PMT) or a photodiode to collect brightness; the present invention can also use multiple programmable power supplies and arbitrary waveform generators to provide TFT and liquid crystal display panel signals and voltages, with data The output oscilloscope performs data collection and export, and the computer realizes data processing.

Based on the content of the above-mentioned embodiments, the method for measuring the voltage retention ratio provided by the present invention will be described below in conjunction with specific embodiments.

(1) In the preparation stage, it is necessary to provide the corresponding working voltage for the LCD panel module under test.

It mainly provides the VGH, VGL voltage and GND voltage of the liquid crystal display panel, so that the liquid crystal display panel can normally display different grayscale images. Different LCD panel TFT designs, VGH and VGL voltages are different, usually VGH can be 15V, VGL can be -8V, GND is the circuit reference voltage 0V, Vcom is the reference voltage of the liquid crystal layer of the LCD panel, usually one can be used to make the panel flicker Minimum suitable voltage, eg 6.5V. Of course, the optimal Vcom voltage of different display panels will also be different.

(2) Acquiring a voltage-transmittance curve and a gamma curve of the liquid crystal display panel.

Give VGH voltage to the Gate signal line to make the TFT of the liquid crystal display panel open continuously, and give the Data signal line a square wave drive signal with different amplitudes from low to high. FIG. 6 is a schematic waveform diagram of a square wave driving signal used for voltage-transmittance measurement provided by the present invention. As shown in FIG. 6 , the signal frequency of the square wave driving signal is determined according to the design operating frequency of the display panel. For a common 60Hz panel, the frequency of the driving signal is 30Hz. Simultaneously measure the screen brightness of the LCD panel while giving Data a driving signal. FIG. 7 is a schematic diagram of the voltage-transmittance curve provided by the present invention. As shown in FIG. 7 , the voltage-transmittance curve can be drawn according to the corresponding screen brightness under different driving voltages.

Further, the gamma value is taken as 2.2 according to industry practice, and the voltage-transmittance curve is converted into a grayscale-voltage curve (ie, a gamma curve).

(3) Determine the display voltage signal of the Data signal line (that is, the data line).

Select the target voltage value corresponding to the target test gray scale in the gamma curve for optical VHR measurement, or select a suitable voltage corresponding to the transmittance in the VT curve for optical VHR measurement.

Generally, it is necessary to select brightness points with a gray scale above 10 or a transmittance above 8% as measurement points in order to obtain better optical brightness measurement sensitivity. Preferably, the voltage value corresponding to 50% transmittance or 127 gray scales is selected as the target voltage value to make the brightness change more obvious.

Based on the content of the display voltage signal introduced in the foregoing embodiments, as shown in Figure 3, the display voltage signal is a positive and negative square wave voltage signal relative to the Vcom voltage; the voltage magnitude of the positive and negative square wave signal (relative to Vcom voltage) is the same as the target voltage value.

The display voltage signal has a high-level phase and a low-level phase; the high-level phase and the low-level phase are alternately switched frame by frame.

(4) Optical VHR measurement of liquid crystal display panels.

Provide the display voltage signal required for the target test gray scale for the Data signal line (that is, the data line). The frequency can be 60Hz--0.1Hz, and the frequency can be adjusted according to the actual measurement requirements. Display the beginning of the positive cycle (high level phase) and negative cycle (low level phase) of the voltage signal, supply the VGH voltage to the Gate signal line, and make the TFT open for a very short time (usually 0.3 milliseconds charging time or less , panel and TFT design are different, the optimal charging time will be different), the voltage signal on the Data line is sent to the liquid crystal layer.

A frame period includes a charging phase and a holding phase, and the end of the charging phase is the starting time of the holding phase. At this time, the Gate signal line supplies voltage to VGL to turn off the TFT. Measuring the change of screen brightness of the display panel during the whole maintenance period.

In one embodiment, the display voltage signal at least includes a set of a high-level period and a low-level period, and the low-level period starts after the high-level period ends. In a set of positive and negative drive cycles of the Data signal, the positive cycle corresponds to a high level phase, and the negative cycle corresponds to a low level phase.

Based on the content in the above embodiment, the acquisition of the luminance change curve of the display panel in the holding phase under the drive of the display voltage signal includes: acquiring the first luminance change curve of the display panel in the first holding phase curve, and the second luminance change curve of the display panel in the second holding stage; the first holding stage is the holding stage of the display panel driven by the high level stage; the second holding stage is The holding stage of the display panel under the driving of the low-level stage; correspondingly, the determining the voltage holding rate of the display panel according to the brightness change curve includes: according to the first brightness change curve and The second brightness change curve determines the voltage retention rate of the display panel.

Two methods for determining the voltage retention rate of the display panel according to the first luminance change curve and the second luminance change curve are introduced below.

As an optional embodiment, the determining the voltage retention rate of the display panel according to the first luminance change curve and the second luminance change curve includes:

Acquiring a first maintained brightness of the first brightness change curve at the end moment of the first maintained phase, and a first maximum brightness in the first maintained phase; and,

Acquiring a second maintained brightness of the second brightness change curve at the end of the second maintained phase, and a second maximum brightness in the second maintained phase;

Determine the voltage retention rate of the display panel according to the first maintained brightness, the first maximum brightness, the second maintained brightness and the second maximum brightness.

Fig. 8 is a schematic diagram of the optical VHR extremum calculation method provided by the present invention. As shown in Fig. 8, the positive cycle corresponds to the high level stage of the display voltage signal, and the negative cycle corresponds to the low level stage of the display voltage signal; the first maintained brightness is lend1, the first maximum brightness is Lmax1, and the second maintained brightness is lend2, the second maximum brightness is Lmax2. The brightness change waveform shown in FIG. 8 includes the first brightness change curve and the second brightness change curve.

In this embodiment, the voltage retention rate is the average value of the first optical voltage retention rate and the second optical voltage retention rate; wherein, the first optical voltage retention rate is the ratio of the first maintained brightness lend1 to the first maximum brightness Lmax1; The second optical voltage holding rate is a ratio of the second holding brightness lend2 to the second maximum brightness Lmax2.

Fig. 9 is a schematic diagram of the optical VHR integral calculation method provided by the present invention. With reference to Fig. 9, another method for determining the voltage retention rate of the display panel according to the first luminance change curve and the second luminance change curve is now described. .

Integrating the first luminance change curve within a time length corresponding to the first holding stage to obtain a first luminance integral Sreal1; and, within a time length corresponding to the first holding stage Integrate to obtain the first constant luminance integral Sideal1.

Integrating the second luminance change curve within a time length corresponding to the second holding stage to obtain a second luminance integral Sreal2; and, within a time length corresponding to the second holding stage Integrate to obtain the second constant luminance integral Sideal2.

The voltage retention rate is the average value of the third optical voltage retention rate and the fourth optical voltage retention rate; wherein, the third optical voltage retention rate is the ratio of the first brightness integral Sreal1 to the first constant brightness integral Sideal1 ; The fourth optical voltage retention rate is a ratio of the second brightness integral Sreal2 to the second constant brightness integral Sideal2.

In order to illustrate the advantages of the method for measuring the voltage retention rate of the display panel provided by the present invention. In the embodiment of using the method of the present invention to measure the voltage retention rate of the display panel, 3 kinds of liquid crystal display panels are selected, wherein there are display normal areas (OK areas) and display abnormal areas (NG areas) in panel 2 and panel 3. ), there are 5 different embodiments for combined measurement. For specific optical VHR measurement data results, see Table 1.

Table 1 Comparison table of VHR measurement results

LCD panel Positive frame VHR Negative frame VHR Average VHR panel 1 61.1% 86.9% 74.0% Panel 2-NG area 43.8% 83.9% 63.9% Panel 2-OK area 61.4% 86.1% 73.7% Panel 3-NG area 78.7% 92.1% 85.4% Panel 3-OK area 85.0% 92.8% 88.9%

As shown in Table 1, it can be seen from the data that panel 1 and panel 2 have the same optical VHR in the OK area; and for panels 2 and 3, the optical VHR in the OK area is significantly higher than that in the NG area. Among them, the positive frame VHR is the VHR value obtained based on the first holding stage; the negative frame VHR is the VHR value obtained based on the second holding stage; the average value VHR is the voltage holding rate obtained by the final measurement.

FIG. 10 is a schematic structural diagram of a device for measuring the voltage retention rate of a display panel provided by the present invention. The device includes: a first module 1001 , a second module 1002 , a third module 1003 and a fourth module 1004 .

The first module 1001 is configured to determine the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale;

The second module 1002 is configured to generate a display voltage signal corresponding to the target test gray scale according to the target voltage value; the display voltage signal is a positive and negative square wave voltage signal relative to a reference voltage of the display panel; the The voltage magnitude of the positive and negative square wave signals is the same as the target voltage value;

The third module 1003 is configured to acquire the luminance change curve of the display panel in the holding phase under the drive of the display voltage signal; the display voltage signal is a driving signal of the display panel input through the data line;

The fourth module 1004 is configured to determine the voltage retention rate of the display panel according to the brightness change curve.

It should be noted that, the device for measuring the voltage retention rate of the display panel provided by the embodiment of the present invention can implement the method for measuring the voltage retention rate of the display panel described in any of the above-mentioned embodiments during specific operation. Examples will not be repeated.

FIG. 11 is a schematic structural diagram of an electronic device provided by the present invention. As shown in FIG. 11 , the electronic device may include: a processor (processor) 1110, a communication interface (Communications Interface) 1120, a memory (memory) 1130 and a communication bus 1140, Wherein, the processor 1110 , the communication interface 1120 , and the memory 1130 communicate with each other through the communication bus 1140 . The processor 1110 can call the logic instructions in the memory 1130 to execute the method for measuring the voltage retention rate of the display panel. The method includes: determining the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale; The target voltage value generates a display voltage signal corresponding to the target test gray scale; the display voltage signal is a drive signal of the display panel input through the data line, and the display voltage signal is relative to the reference voltage of the display panel. Positive and negative square wave voltage signals; the voltage of the positive and negative square wave signals is the same as the target voltage value; driven by the display voltage signal, the brightness change curve of the display panel in the maintenance stage is obtained; according to the The brightness change curve is used to determine the voltage retention rate of the display panel.

In addition, the above-mentioned logic instructions in the memory 1130 may be implemented in the form of software function units and may be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

On the other hand, the present invention also provides a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer When executing, the computer can execute the method for measuring the voltage retention rate of the display panel provided by the above-mentioned embodiments, the method includes: determining the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale; The target voltage value is used to generate the display voltage signal corresponding to the target test gray scale; the display voltage signal is the drive signal of the display panel input through the data line, and the display voltage signal is positive relative to the reference voltage of the display panel. Negative square wave voltage signal; the voltage of the positive and negative square wave signal is the same as the target voltage value; driven by the display voltage signal, the brightness change curve of the display panel in the maintenance stage is obtained; according to the The brightness change curve determines the voltage retention rate of the display panel.

In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it is implemented to perform the determination of the voltage retention ratio of the display panel provided by the above-mentioned embodiments. A measurement method, the method comprising: according to the target test gray scale, determining the corresponding target voltage value on the gamma curve of the display panel; according to the target voltage value, generating a display voltage signal corresponding to the target test gray scale; The display voltage signal is the drive signal of the display panel input through the data line, and the display voltage signal is a positive and negative square wave voltage signal relative to the reference voltage of the display panel; the voltage of the positive and negative square wave signal is consistent with the target The voltage values are the same; driven by the display voltage signal, the brightness change curve of the display panel in the maintenance stage is obtained; according to the brightness change curve, the voltage retention rate of the display panel is determined.

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without any creative efforts.

Through the above description of the implementations, those skilled in the art can clearly understand that each implementation can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic discs, optical discs, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A method for measuring the voltage retention rate of a display panel, characterized in that, comprising: Determine the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale; According to the target voltage value, generate a display voltage signal corresponding to the target test gray scale; the display voltage signal is a driving signal of the display panel input through the data line, and the display voltage signal is relative to the reference voltage of the display panel It is a positive and negative square wave voltage signal; the voltage of the positive and negative square wave signal is the same as the target voltage value; Driven by the display voltage signal, acquiring a luminance change curve of the display panel in a holding phase; According to the brightness change curve, the voltage retention rate of the display panel is determined. 2. The method for measuring the voltage retention rate of the display panel according to claim 1, wherein, before determining the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale, the method includes: Obtaining a voltage-transmittance curve of the display panel; Converting the voltage-transmittance curve of the display panel into a gamma curve according to the gamma value of the display panel. 3. The method for measuring the voltage retention rate of the display panel according to claim 1, wherein the display voltage signal has a high-level phase and a low-level phase; the high-level phase and the low-level phase The flat phase is alternately switched frame by frame; the display panel has a charging phase and a holding phase within a frame period driven by the display voltage signal; the holding phase starts after the charging phase ends. 4. The method for measuring the voltage retention rate of a display panel according to claim 3, wherein the display voltage signal at least includes a set of high-level phases and low-level phases, and the low-level phases are in the starts after the end of the high level phase; The acquisition of the luminance change curve of the display panel in the holding phase under the drive of the display voltage signal includes: Acquiring a first luminance change curve of the display panel in the first maintenance stage, and a second luminance change curve of the display panel in the second maintenance stage; The first holding stage is a holding stage of the display panel driven by the high level stage; the second holding stage is a holding stage of the display panel driven by the low level stage; Correspondingly, the determining the voltage retention rate of the display panel according to the brightness change curve includes: According to the first luminance change curve and the second luminance change curve, the voltage retention rate of the display panel is determined. 5. The method for measuring the voltage retention rate of the display panel according to claim 4, wherein the voltage retention rate of the display panel is determined according to the first brightness variation curve and the second brightness variation curve. rates, including: Acquiring a first maintained brightness of the first brightness change curve at the end moment of the first maintained phase, and a first maximum brightness in the first maintained phase; and, Acquiring a second maintained brightness of the second brightness change curve at the end of the second maintained phase, and a second maximum brightness in the second maintained phase; Determine the voltage retention rate of the display panel according to the first maintained brightness, the first maximum brightness, the second maintained brightness and the second maximum brightness. 6. The method for measuring the voltage retention rate of a display panel according to claim 5, wherein the method according to the first maintained luminance, the first maximum luminance, the second maintained luminance and the first 2. The maximum brightness, which determines the voltage retention rate of the display panel, includes: determining the voltage retention rate according to the average value of the first optical voltage retention rate and the second optical voltage retention rate; The first optical voltage retention rate is a ratio of the first maintained brightness to the first maximum brightness; the second optical voltage retention rate is a ratio of the second maintained brightness to the second maximum brightness. 7. The method for measuring the voltage retention rate of the display panel according to claim 5, wherein the voltage retention rate of the display panel is determined according to the first brightness variation curve and the second brightness variation curve. rate, also includes: Integrating the first luminance change curve in the first holding phase to obtain a first luminance integral; and, Integrating the first maximum luminance in the first holding phase to obtain a first constant luminance integral; Integrating the second luminance change curve in the second holding stage to obtain a second luminance integral; and integrating the second maximum luminance in the second holding stage to obtain a second constant luminance integral ; determining the voltage retention rate according to the average value of the third optical voltage retention rate and the fourth optical voltage retention rate; The third optical voltage retention rate is the ratio of the first luminance integral to the first constant luminance integral; the fourth optical voltage retention rate is the ratio of the second luminance integral to the second constant luminance integral ratio. 8 . The method for measuring the voltage retention rate of a display panel according to claim 4 , wherein when the full grayscale of the display panel is 0 to 255, the target test grayscale is 127. 9. A measuring device for a voltage retention rate of a display panel, comprising: The first module is used to determine the corresponding target voltage value on the gamma curve of the display panel according to the target test gray scale; The second module is configured to generate a display voltage signal corresponding to the target test gray scale according to the target voltage value; the display voltage signal is a positive and negative square wave voltage signal relative to the reference voltage of the display panel; the positive The voltage of the negative square wave signal is the same as the target voltage value; The third module is configured to acquire the luminance change curve of the display panel in the holding phase under the drive of the display voltage signal; the display voltage signal is a driving signal of the display panel input through the data line; The fourth module is configured to determine the voltage retention rate of the display panel according to the brightness change curve. 10. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, characterized in that, when the processor executes the computer program, the computer program according to claim 1 is realized. Steps in the method for measuring the voltage retention rate of the display panel described in any one of 1 to 7.

Images