CN109444606B

CN109444606B - Charging test method and charging test device

Info

Publication number: CN109444606B
Application number: CN201811542081.2A
Authority: CN
Inventors: 周亚萍
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2020-06-16
Anticipated expiration: 2038-12-17
Also published as: CN109444606A; WO2020124825A1

Abstract

The application provides a charging test method, which comprises the following steps: acquiring a first charging voltage of the display panel in a charging process, wherein the first charging voltage is the maximum charging voltage in the charging process; acquiring a preset feed-through voltage; acquiring a second charging voltage according to the first charging voltage and the preset feed-through voltage; and acquiring a first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length. The refresh frequency of the charging time of the display panel is set to be 120 Hz, and the situation of insufficient charging or wrong charging can not occur when the display panel is charged, so that the charging efficiency of the display panel is improved.

Description

Charging test method and charging test device

Technical Field

The present disclosure relates to charging technologies, and in particular, to a charging test method and a charging test apparatus.

Background

With the development of the display panel industry, the product size increases, and the refresh frequency increases to become the development trend of the display panel. The display panel with the refresh frequency of 120 Hz often has the condition of insufficient charging or wrong charging in the charging process due to the increase of the inherent size. Currently, a display panel with a refresh rate of 60 hz is generally selected for the analog charging time. In the analog charging process, the display panel with the refresh frequency of 60 Hz is generally charged by a card-controlled mis-charging method. However, if the display panel with the refresh frequency of 120 hz is charged in a card-controlled mis-charging manner during the analog charging, the display panel with the refresh frequency of 120 hz may be insufficiently charged or severely mis-charged.

Disclosure of Invention

The embodiment of the application provides a charging test method and a charging test device, which can avoid the situation that a display panel with the refresh frequency of 120 Hz is insufficiently charged or is seriously mistakenly charged in the charging process.

In a first aspect, an embodiment of the present application provides a charging test method, which is applied to a display panel, and the method includes:

acquiring a first charging voltage of the display panel in a charging process, wherein the first charging voltage is the maximum charging voltage in the charging process;

acquiring a preset feed-through voltage;

acquiring a second charging voltage according to the first charging voltage and the preset feed-through voltage;

and acquiring a first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length.

In the charging test method provided in the embodiment of the present application, the step of obtaining the first charging duration according to the second charging voltage and the preset corresponding relationship includes:

acquiring a first resistance value of the display panel;

acquiring a second resistance value according to the first resistance value and a preset resistance compensation value;

and acquiring a first charging time length according to the second charging voltage, the second resistance value and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second charging voltage, the second resistance value and the first charging time length.

calculating a ratio between the first charging voltage and the second charging voltage;

and acquiring a first charging time length according to the second charging voltage, the ratio and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second charging voltage, the ratio and the first charging time length.

In the charging test method provided in the embodiment of the present application, the step of obtaining the first charging duration according to the second charging voltage, the ratio, and the preset corresponding relationship includes:

acquiring a first resistance value of the display panel;

and acquiring a first charging time according to the second charging voltage, the ratio, the second resistance value and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage, the ratio, the second resistance value and the first charging time.

In the charging test method provided by the embodiment of the application, the charging process includes the constant voltage charging stage, first charging voltage does the charging voltage in the constant voltage charging stage, preset corresponding relation includes that first sub-preset corresponding relation and second sub-preset corresponding relation, according to second charging voltage and preset corresponding relation, the step of obtaining first charging duration includes:

acquiring a first resistance value of the display panel;

acquiring a charging time length set according to the second charging voltage and a first sub-preset corresponding relation, wherein the charging time length set comprises at least two charging time lengths, and the first sub-preset corresponding relation comprises a corresponding relation between the second charging voltage and the charging time length set;

and acquiring a first charging time length according to the charging time length set, the second resistance value and a second sub-preset corresponding relation, wherein the second sub-preset corresponding relation comprises the corresponding relation among the charging time length set, the second resistance value and the first charging time length.

In the charging test method provided in the embodiment of the present application, the step of obtaining the charging duration set according to the second charging voltage and the first sub-preset corresponding relationship includes:

and acquiring a charging time length set according to the second charging voltage, the ratio and a first sub-preset corresponding relation, wherein the first sub-preset corresponding relation comprises a corresponding relation among the second charging voltage, the ratio and the charging time length set.

In the charging test method provided by the embodiment of the application, the charging process includes a first stage, a constant voltage charging stage and a second stage which are performed in sequence, the first stage is a stage in which the charging voltage is gradually increased, the second stage is a stage in which the charging voltage is gradually decreased, the display panel includes a scanning line and a data line, the first charging voltage is the charging voltage when the scanning line is in the constant voltage charging stage, and the step of obtaining the first charging duration according to the second charging voltage and a preset corresponding relation includes;

when the data line enters the first stage, acquiring a third charging voltage of the data line;

acquiring a fourth charging voltage of the data line in a constant voltage charging stage;

acquiring a fifth charging voltage of the scanning line in the second stage;

obtaining a sixth charging voltage according to the fourth charging voltage and the preset feed-through voltage;

calculating a first ratio between the third charging voltage and the sixth charging voltage;

calculating a second ratio between the fifth charging voltage and the second charging voltage;

and acquiring a first charging time length according to the second charging voltage, the first ratio, the second ratio and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second charging voltage, the first ratio, the second ratio and the first charging time length.

In the charging test method provided in the embodiment of the present application, the preset correspondence includes a third sub-preset correspondence and a fourth sub-preset correspondence, and the step of obtaining the first charging duration according to the second charging voltage, the first ratio, the second ratio, and the preset correspondence includes:

acquiring a second charging time length according to the second charging voltage, the first ratio and a third sub-preset corresponding relation, wherein the third sub-preset corresponding relation comprises a corresponding relation among the second charging voltage, the first ratio and the second charging time length;

acquiring a third charging time length according to the second charging voltage, the second ratio and a fourth sub-preset corresponding relation, wherein the fourth sub-preset corresponding relation comprises a corresponding relation among the second charging voltage, the second ratio and the third charging time length;

and acquiring a first charging time length according to the third charging time length and the second charging time length.

In the charging test method provided by the embodiment of the application, the step of obtaining the first charging duration according to the second charging voltage, the first ratio, the second ratio and the preset corresponding relation comprises;

acquiring a first resistance value of the display panel;

and acquiring a first charging time according to the second resistance value, the second charging voltage, the first ratio, the second ratio and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second resistance value, the second charging voltage, the first ratio, the second ratio and the first charging time.

In a second aspect, an embodiment of the present application provides a charging test apparatus, including:

the first acquisition module is used for acquiring a first charging voltage of the display panel in a charging process, wherein the first charging voltage is the maximum charging voltage in the charging process;

the second acquisition module is used for acquiring a preset feed-through voltage;

the third obtaining module is used for obtaining a second charging voltage according to the first charging voltage and the preset feed-through voltage;

and the fourth obtaining module is used for obtaining the first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length.

The application provides a charging test method, which comprises the following steps: acquiring a first charging voltage of the display panel in a charging process, wherein the first charging voltage is the maximum charging voltage in the charging process; acquiring a preset feed-through voltage; acquiring a second charging voltage according to the first charging voltage and the preset feed-through voltage; and acquiring a first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length. This application passes through the biggest charging voltage in the charging process, and first charging voltage promptly and predetermine feed through voltage, acquire the second charging voltage. And acquiring the first charging time according to the second charging voltage and the preset corresponding relation. The charging time length is set as the charging time length of the display panel with the refresh frequency of 120 Hz, namely, the display panel with the refresh frequency of 120 Hz cannot be insufficiently charged or seriously mistakenly charged in the charging process in the charging time length.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic diagram of a first process of a charging process according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a second charging process provided in the embodiment of the present application.

Fig. 3 is a schematic flowchart of a first method for testing charging according to an embodiment of the present disclosure.

Fig. 4 is a schematic flowchart of a second method for testing charging according to an embodiment of the present disclosure.

Fig. 5 is a schematic flow chart of a third charging test method according to an embodiment of the present disclosure.

Fig. 6 is a fourth flowchart illustrating a charging test method according to an embodiment of the present disclosure.

Fig. 7 is a fifth flowchart illustrating a charging test method according to an embodiment of the present application.

Fig. 8 is a sixth flowchart illustrating a charging test method according to an embodiment of the present application.

Fig. 9 is a seventh flowchart illustrating a charging test method according to an embodiment of the present application.

Fig. 10 is a schematic waveform diagram of scan lines and data lines of a charging test according to an embodiment of the present application.

Fig. 11 is an eighth flowchart illustrating a charging test method according to an embodiment of the present application.

Fig. 12 is a ninth flowchart illustrating a charging test method according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of a charging test apparatus according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In some embodiments, the refresh frequency is the speed at which the image is updated on the screen, i.e., the number of times per second the image on the screen appears. The higher the refresh frequency, the less flicker is perceived in the image on the screen and the higher the stability.

The mischarge is understood because scan line opening is a progressive scan. That is, when the scan line of the previous row is not turned off in time, the signal of the data line of the next row is charged to the previous row, so that the charging voltage in the charging process of the display panel is different from the ideal charging voltage. The display panel with the refresh frequency of 60 Hz is charged in a card-controlled wrong charging mode. However, if the display panel with the refresh frequency of 120 hz is charged in a card-controlled mischarging manner within a given time, the charging time of the display panel with the refresh frequency of 120 hz is seriously insufficient, and even a negative charging time condition occurs. And if the charging time is long, the situation of serious wrong charging can occur.

In a general case, the charging duration of the display panel is obtained by a charging test method, and the influence of the charging duration on the display panel needs to be considered. If there is a certain fluctuation in the process conditions, there will be a certain difference in the actual optimum charging time. If the optimal charging time for the display panel with the refresh frequency of 60 Hz fluctuates within 3-4 microseconds, the charging is not greatly influenced, mainly because the charging is sufficient. The display panel with the refresh frequency of 120 hz may have a charging time varying by 0.2 μ s due to insufficient charging, which may result in different charging conditions. I.e. the fluctuation of the charging time is small. Then, under the condition that the fluctuation of the charging time is small, the charging time length of the display panel with the refresh frequency of 120 Hz is simulated, and the problem that the display panel with the refresh frequency of 120 Hz is insufficiently charged or is charged by mistake in the charging process can be solved.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a first charging process according to an embodiment of the present disclosure.

First, the charging process may include a first phase 11 and a second phase 12 that are performed in sequence. The first stage 11 is a process in which the voltage is gradually increased. The second stage 12 is a process in which the voltage is gradually decreased. It follows from the above charging process that there must be a maximum charging voltage during the first phase 11 to the second phase 12. And because the present application is a charge test procedure, the selected value is also an arbitrary value. The waveform diagram as shown in fig. 1 can be acquired. Or in the charging test process, when the display panel is charged with the maximum charging voltage, the power adapter is directly unplugged, and the waveform diagram shown in fig. 1 can also be made.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a second charging process according to an embodiment of the present disclosure.

The charging process further comprises a first phase 11, a constant voltage charging phase 13 and a second phase 12 in sequence. The first stage 11 is a process in which the voltage is gradually increased. The constant voltage charging phase 13 is a phase in which the voltage is kept constant. The second stage 12 is a process in which the voltage is gradually decreased. According to the above charging process, the constant voltage charging stage 13 is the maximum charging voltage in the charging process and includes a plurality of charging voltages with equal values.

Referring to fig. 3, fig. 3 is a first flowchart of a charging test method according to an embodiment of the present disclosure.

The charging test method comprises the following steps:

and 110, acquiring a first charging voltage of the display panel in a charging process, wherein the first charging voltage is the maximum charging voltage in the charging process.

The charging process may include a first phase and a second phase that are performed sequentially. The first stage is a process in which the voltage gradually increases. The second stage is a process of gradually reducing the voltage. The first charging voltage is the maximum charging voltage during the first phase going to the second phase. And the charging voltage is only one.

The charging process also comprises a first stage, a constant voltage charging stage and a second stage which are sequentially carried out. The first stage is a process in which the charging voltage is gradually increased. The constant voltage charging stage is a stage in which the charging voltage is kept unchanged. The second stage is a process in which the charging voltage is gradually decreased. It is understood that the charging voltage in the constant voltage charging phase is the maximum charging voltage during charging. The first charging voltage is thus the maximum charging voltage at the time of the constant-voltage charging phase. And the first charging voltage is a plurality of voltages with equal values.

And 120, acquiring a preset feed-through voltage.

The feedthrough voltage is generated due to several capacitive coupling effects. When the scanning line is turned off, the pixel potential is lowered. During the actual charging process, the effective charging time of the display panel is estimated to ensure the maximum charging voltage. I.e. the actual charging voltage is equal to the difference between the maximum charging voltage and the feedthrough voltage of the display panel during an ideal charging process. If the charging voltage of the display panel during the ideal charging process is guaranteed to be the maximum charging voltage, the influence of the feed-through voltage needs to be considered. In addition, the value of the feed-through voltage of the display panel is changed under certain conditions. The processor has stored this feedthrough voltage in the memory upon detection of the actual charging voltage of the display panel. When the processor obtains the feedthrough voltage, it can obtain the feedthrough voltage by directly obtaining the feedthrough voltage from the memory.

It will also be appreciated that, for example, during an ideal charging of the display panel, the display panel may be charged by a charging voltage set by the processor. However, the display panel is charged with some energy consumption, so that the display panel cannot be charged according to the set charging voltage. For example, the set charging voltage is 5V, but during the actual charging process, the display panel is not charged according to the set charging voltage of 5V, but is charged according to the actual charging voltage of 4V. That is, during the actual charging process, the display panel consumes 1V of power, so that the display panel is charged at the actual charging voltage of 4V. And the charging voltage detected by the processor in the detection process is the charging voltage of the display panel in the actual charging process.

Therefore, the actual charging voltage of the display panel is obtained, and the ideal charging voltage of the display panel can be obtained according to the feed-through voltage. That is, the ideal charging voltage is the maximum charging voltage of the display panel during the charging process.

And 130, acquiring a second charging voltage according to the first charging voltage and the preset feed-through voltage.

Since the charging voltage of the display panel in the ideal charging process is guaranteed to be the maximum charging voltage. That is, according to the formula, the actual charging voltage is equal to the difference between the maximum charging voltage and the feedthrough voltage of the display panel during the ideal charging process. The maximum charging voltage of the display panel during an ideal charging process is equal to the sum of the actual charging voltage and the feedthrough voltage. The loss of the charging voltage of the display panel during the actual charging process is corrected. That is, the maximum charging voltage of the display panel in the ideal charging process is the second charging voltage.

And 140, acquiring the first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length.

Since the preset correspondence relationship includes a correspondence relationship between the second charging voltage and the first charging period, for example, as shown in table 1, the correspondence relationship between the second charging voltage and the first charging period is provided.

TABLE 1

Second charging voltage	First charging period
		7	0.6
8	0.7
		……	……

As shown in table 1, the predetermined corresponding relationship is a corresponding relationship between the second charging voltage and the first charging time. The values in table 1 are merely for reference, and the values of the second charging voltage and the first charging time period may be a fixed value or a range of values, which is not limited herein. The first charging period of the display panel may be obtained by the known second charging voltage according to table 1. The second charging voltage is therefore the maximum voltage reached during the ideal charging of the display panel. When the display panel is charged by the second charging voltage, no loss is generated. The first charging time obtained according to the second charging voltage is the maximum charging time that the display panel can obtain in an ideal process, that is, the effective charging time. The first charging time period set by the display panel is defined as the effective charging time, namely, the condition that the display panel with the refresh frequency of 120 Hz is not charged enough or is not charged by mistake is prevented.

The unit of the charging time period may be in units of microseconds, seconds, minutes, or hours. For example 10 microseconds, 20 seconds, 600 minutes or 5 hours.

In summary, the charging voltages corresponding to the display panel are obtained by setting different charging durations, and after the influence of the feed-through voltage is removed, the charging voltages corresponding to the different charging durations are drawn into a waveform diagram. And the charging time length corresponding to the maximum charging voltage displayed in the waveform diagram is the effective charging time of the display panel.

When the display panel is in the charging process, only one first charging voltage exists:

in some embodiments, as shown in fig. 4, 140, the first charging duration is obtained according to the second charging voltage and a preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the second charging voltage and the first charging duration, including the following steps.

141, a first resistance value of the display panel is obtained.

142, obtaining a second resistance value according to the first resistance value and the preset resistance compensation value.

143, obtaining the first charging duration according to the second charging voltage, the second resistance value and a preset corresponding relationship, wherein the preset corresponding relationship includes a corresponding relationship between the second charging voltage, the second resistance value and the first charging duration.

First, the process reflects the difference in the thickness of each film during the manufacturing process, and if the metal film is thinner than the desired value during the manufacturing process, the resistance will increase. The worst case needs to be considered during the charging test. I.e. the influence of the manufacturing on the display panel needs to be taken into account. And the scan lines and the data lines of the display panel also determine the effective charging time of the display panel. Therefore, the resistance of the display panel is increased by the original U% or the resistance of the scanning line and the data line is increased by the original U%. For example, U may have a value of 20. That is, the resistance value of the display panel is increased by 20% or the resistance values of the scan line and the data line are both increased by 20% to obtain the second resistance value. For example, the second resistance value is obtained according to the first resistance value and a preset resistance compensation value. The sum of the first resistance value and the preset resistance compensation value can be calculated to obtain a second resistance value. Or obtaining the second resistance value according to the corresponding relationship between the first resistance value, the preset resistance compensation percentage and the second resistance value, as shown in table 2. Take the resistance of the display panel as an example

TABLE 2

First resistance value	Preset percentage of resistance Compensation (U%)	Second resistance value
			5	20％	5+5×20％＝6
6	20％	6+6×20％＝7.2
			……	……	……

As can be seen from table 2, according to the correspondence between the first resistance value and the second resistance value, if the first resistance value is known, the second resistance value can be obtained through the correspondence. The values of the first resistance value, the predetermined resistance compensation percentage, and the second resistance value in table 1 are only for reference, and are not described herein.

After the second resistance value is obtained, the first charging duration is obtained according to the second charging voltage, the second resistance value and the preset corresponding relation. For example, the corresponding relationship between the second charging voltage, the second resistance value and the first charging time period is shown in table 3.

TABLE 3

Second charging voltage	Second resistance value	First charging period
			5	6	0.6
7	8	2.2
			……	……	……

The corresponding relationship between the second charging voltage, the second resistance value and the first charging time period can be obtained from table 3. The values of the second charging voltage, the second resistance value and the first charging duration are only reference values, which are not described herein.

In addition, if the acquired first charging time period is 2.2. If 2.4 is selected as the effective charging time, the display panel is severely charged by mistake. If 2.2 or 2.3 is selected as the effective charging time, the situation that the display panel is slightly charged by mistake is shown. If 2.0 is selected as the effective charging time, the display panel is not charged by mistake.

In some embodiments, as shown in fig. 5, 140, the first charging duration is obtained according to the second charging voltage and a preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the second charging voltage and the first charging duration, including the following steps.

144, a ratio between the first charging voltage and the second charging voltage is calculated.

145, obtaining the first charging duration according to the second charging voltage, the ratio and a preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the second charging voltage, the ratio and the first charging duration.

The ratio of the first charging voltage to the second charging voltage is calculated. The ratio may be defined as the charging rate. For example, the charging voltage of the display panel in the ideal charging is 5V, and the charging voltage of the display panel in the actual charging is 4V. The ratio or charging rate is 0.8. And acquiring the first charging time according to the second charging voltage, the charging rate or the ratio and a preset corresponding relation. The correspondence between the second charging voltage, the ratio, and the first charging period or the correspondence between the second charging voltage, the charging rate, and the first charging period is shown in table 4.

TABLE 4

Second charging voltage	Ratio (charging rate)	First charging period
			3	0.5	0.4
4	0.8	1
			……	……	……

From table 4, the correspondence between the second charging voltage, the ratio, and the first charging period, or the correspondence between the second charging voltage, the charging rate, and the first charging period can be obtained. The second charging voltage, the ratio and the first charging duration are only reference values, which are not described herein.

In some embodiments, as shown in fig. 6, 145, obtaining the first charging duration according to the second charging voltage, the ratio and a preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the second charging voltage, the ratio and the first charging duration, includes the following steps.

1451, obtaining a first resistance value of the display panel.

1452, obtaining a second resistance value according to the first resistance value and the preset resistance compensation value.

1453, obtaining the first charging duration according to the second charging voltage, the ratio, the second resistance value and a preset corresponding relationship, wherein the preset corresponding relationship comprises a corresponding relationship between the second charging voltage, the ratio, the second resistance value and the first charging duration.

Please refer to the above discussion and table 3 for how the first resistance value obtains the second resistance value, which is not described herein.

In addition, for example, the correspondence relationship between the second charging voltage, the ratio, the second resistance value, and the first charging period is shown in table 5.

TABLE 5

Second charging voltage	Ratio of	Second resistance value	First charging period
				4	0.1	5	0.6
5	0.5	5	0.7
				……	……	……	……

As shown in table 5, table 5 only shows that the second resistance values are the same, and the first charging duration is obtained according to the second charging voltage, the ratio, the second resistance value, and the preset corresponding relationship. Table 5 shows only a part of the predetermined correspondence relationship. The second resistance value may also have other values. The second charging voltage, the ratio, the second resistance value and the first charging duration are only reference values, which are not described herein.

When the display panel goes through a certain stage in the charging process, namely a constant voltage charging stage, and at least two first charging voltages exist:

in some embodiments, as shown in fig. 7, the first charging voltage is a charging voltage of a constant voltage charging phase. The preset corresponding relationship comprises a first sub-preset corresponding relationship and a second sub-preset corresponding relationship. 140, obtaining the first charging duration according to the second charging voltage and a preset corresponding relationship, wherein the preset corresponding relationship includes a corresponding relationship between the second charging voltage and the first charging duration, including the following steps.

146, a first resistance value of the display panel is obtained.

147, obtaining a second resistance value according to the first resistance value and the preset resistance compensation value.

148, acquiring a charging duration set according to the second charging voltage and a first sub-preset corresponding relationship, wherein the charging duration set comprises at least two charging durations, and the first sub-preset corresponding relationship comprises a corresponding relationship between the second charging voltage and the charging duration set.

149, obtaining the first charging duration according to the charging duration set, the second resistance value and a second sub-preset corresponding relationship, wherein the second sub-preset corresponding relationship includes a corresponding relationship between the charging duration set, the second resistance value and the first charging duration.

The first resistance value is used to obtain the second resistance value, please refer to the above discussion, which is not described herein.

Because the display panel is in the charging process, there is a constant voltage charging phase. And the charging voltage remains unchanged during the constant voltage charging phase. There are thus at least two first charging voltages of equal value. I.e. the second charging voltage, there are also at least two charging voltages of equal value.

Further, although the charging voltage remains unchanged, the charging period of time does not remain unchanged according to the charging voltage. Since the charging time period is a gradually increasing process in the display panel charging process. Therefore, at least two charging voltages with equal values exist in the constant voltage charging stage, but the charging time lengths corresponding to the charging voltages with equal values are different.

Then, a charging duration set is obtained according to the second charging voltage and the first sub-preset corresponding relation. Wherein the correspondence between the second charging voltage and the set of charging periods is shown in table 6.

TABLE 6

As shown in table 6, the correspondence between the second charging voltage and the set of charging periods can be obtained. The numerical values in table 6 are only for reference and are not described herein. Because of the influence of the manufacturing process, the charging time period set, the second resistance value and the first charging time period are corresponding to each other as shown in table 7.

TABLE 7

As can be seen from table 7, the corresponding relationship between the set of charging periods, the second resistance value, and the first charging period. The values in table 7 are only reference values and are not described herein. Since there are multiple charging duration values in the charging set. And acquiring the first charging time length according to the corresponding relation among the charging set, the second resistance value and the first charging time length. The first charging time is the effective charging time of the display panel.

In some embodiments, as shown in fig. 8, 148, obtaining a charging duration set according to the second charging voltage and a first sub-preset corresponding relationship, where the first charging duration set includes at least two charging durations, and the first sub-preset corresponding relationship includes a corresponding relationship between the second charging voltage and the charging duration set, includes the following steps.

1481, a ratio between the first charging voltage and the second charging voltage is calculated.

1482, a charging duration set is obtained according to the second charging voltage, the ratio and a first sub-preset corresponding relationship, where the first sub-preset corresponding relationship includes a corresponding relationship between the second charging voltage, the ratio and the charging duration set.

A ratio between the first charging voltage and the second charging voltage is calculated, and the ratio may be defined as a charging rate. When the display panel undergoes a constant voltage charging stage in the charging process, the charging time duration corresponding to each charging voltage is unequal. Therefore, according to the ratio between the first charging voltage and the second charging voltage, the obtained charging durations are not equal, that is, the charging durations corresponding to each ratio are not equal. The corresponding relationship between the second charging voltage, the ratio and the charging time length set is shown in table 8.

TABLE 8

As shown in table 8, the correspondence between the second charging voltage, the ratio, and the charging period set can be obtained. The values in table 8 are only reference values and are not described herein. Through the corresponding relationship of table 8, the charging time period set can be obtained if the second charging voltage and the ratio are known.

In some embodiments, as shown in fig. 9, the charging process includes a first phase, a constant voltage charging phase and a second phase which are sequentially performed, wherein the first phase is a phase in which the charging voltage is gradually increased. The second stage is a stage in which the charging voltage is gradually decreased. The display panel includes scan lines and data lines. The first charging voltage is a charging voltage when the scanning line is in a constant voltage charging stage. And 140, acquiring the first charging time length according to the second charging voltage and the preset corresponding relation, wherein the method comprises the following steps.

And 150, when the data line enters the first stage, acquiring a third charging voltage of the data line.

And 151, acquiring a fourth charging voltage when the data line is in the constant voltage charging phase.

And 152, acquiring a fifth charging voltage when the scanning line is in the second phase.

And 153, obtaining a sixth charging voltage according to the fourth charging voltage and the preset feed-through voltage.

A first ratio between the third charging voltage and the sixth charging voltage is calculated 154.

A second ratio between the fifth charging voltage and the second charging voltage is calculated 155.

And 156, obtaining the first charging duration according to the second charging voltage, the first ratio, the second ratio and a preset corresponding relationship, wherein the preset corresponding relationship comprises the corresponding relationship among the second charging voltage, the first ratio, the second ratio and the first charging duration.

When the charging process of the display panel comprises a constant voltage charging stage, the scanning lines and the data lines are selected as reference objects, so that the effective charging time of the display panel is obtained.

Referring to fig. 10, fig. 10 is a schematic waveform diagram of scan lines and data lines of a charging test according to an embodiment of the present application.

First, since the open scan lines are scanned line by line, after the scan process of the first row of scan lines is completed, the data lines are opened and start to operate. Therefore, there is a certain interval time between the scan line and the data line when the charging voltage is transmitted. The charging time of the scan line and the charging time of the data line are different by a period of time as shown in fig. 10. The waveform diagram 20 of the scanning line includes a first stage where the charging voltage is gradually increased, a constant-voltage charging stage, and a second stage where the charging voltage is gradually decreased. The waveform diagram of the scan line is a waveform diagram 20 plotted according to the ratio between the actual charging voltage and the ideal charging voltage, and the charging duration corresponding to the ratio. For example, because the ideal maximum charging voltage of the display panel is fixed. And calculating the ratio of the actual charging voltage acquired at each stage to the ideal maximum charging voltage. The ratio and the corresponding charging period are then plotted as a waveform diagram.

In addition, in the test process, different charging time periods are set for the display panel firstly. When the charging time length is experienced, an actual charging voltage of the display panel at the charging time length is detected. The ratio between the actual charging voltage and the ideal maximum charging voltage is then calculated. And making a waveform diagram according to the ratio and the corresponding charging time length. And acquiring the effective charging time of the display panel according to the oscillogram. Similarly, the waveform diagram 21 of the data line is also drawn as discussed above, and is not described herein.

Table 9 shows the correspondence between the second charging voltage, the first ratio, the second ratio, and the first charging time period.

TABLE 9

Second charging voltage	First ratio	Second ratio	First charging period
				5	0.2	0.5	2.2
6	0.6	0.6	3.0
				……	……	……	……

As shown in table 9, the first charging period may be obtained according to the second charging voltage, the first ratio, and the correspondence between the second ratio and the first charging period. Wherein the corresponding relation is that the third charging voltage of the data line is obtained when the data line enters the first stage. And acquiring a fourth charging voltage of the data line in the constant voltage charging phase. And calculating the sum of the fourth charging voltage and the preset feed-through voltage to obtain a sixth charging voltage. That is, the sixth charging voltage is the maximum charging voltage in the ideal charging process of the display panel. A first ratio of the third charging voltage to the sixth charging voltage is calculated.

In addition, a fifth charging voltage of the scan line in the second phase needs to be acquired. A second ratio between the fifth charging voltage and the second charging voltage is calculated. And finally, acquiring the first charging time according to the second charging voltage, the first ratio, the second ratio and the preset corresponding relation.

In some embodiments, as shown in fig. 11, the preset corresponding relationship includes a third sub-preset corresponding relationship and a fourth sub-preset corresponding relationship. And 156, acquiring a first charging duration according to the second charging voltage, the first ratio, the second ratio and the preset corresponding relation, and including the following steps.

1561, a second charging duration is obtained according to the second charging voltage, the first ratio and a third sub-preset corresponding relationship, wherein the third sub-preset corresponding relationship includes a corresponding relationship between the second charging voltage, the first ratio and the second charging duration.

1562, a third charging duration is obtained according to the second charging voltage, the second ratio and the second sub-preset corresponding relationship, where the second preset corresponding relationship includes the corresponding relationship between the second charging voltage, the second ratio and the third charging duration.

1563, according to the third charging time and the second charging time, the first charging time is obtained.

And acquiring a second charging time length according to the second charging voltage, the first ratio and the third preset corresponding relation. For example, the correspondence relationship between the second charging voltage, the first ratio, and the second charging period is shown in table 10.

Watch 10

Second charging voltage	First ratio	Second charging period
			5	0.5	2.2
6	0.6	6.0
			……	……	……

As shown in table 10, a corresponding second charging time period may be obtained according to the second charging voltage and the first ratio. The corresponding relationship between the second charging voltage, the second ratio and the third charging period is shown in table 11.

TABLE 11

Second charging voltage	Second ratio	Third charging period
			6	0.6	2.6
7	0.9	3.0
			……	……	……

As shown in table 11, the corresponding third charging time period can be obtained according to the second charging voltage and the second ratio. And then acquiring the first charging time length according to the third charging time length and the second charging time length. The difference between the third charging duration and the second charging duration may be calculated to obtain the first charging duration. The first charging duration can also be obtained according to the corresponding relationship among the third charging duration, the second charging duration and the first charging duration. Shown in table 12.

TABLE 12

Third charging period	Second charging period	First charging period
			3.5	2.4	1.1
6.0	2.5	3.5
			……	……	……

As shown in table 12, the first charging duration may be obtained according to the corresponding relationship among the third charging duration, the second charging duration, and the first charging duration. I.e., T1, as shown in fig. 10.

In some embodiments, as shown in fig. 12, the obtaining 156 the first charging duration according to the second charging voltage, the first ratio, the second ratio and the preset corresponding relationship includes the following steps.

1564, a first resistance value of the display panel is obtained.

1565, a second resistance value is obtained according to the first resistance value and the preset resistance compensation value.

1566 the first charging duration is obtained according to the second resistance, the second charging voltage, the first ratio, the second ratio and the preset corresponding relationship, wherein the preset corresponding relationship includes the corresponding relationship between the second resistance, the second charging voltage, the first ratio, the second ratio and the first charging duration.

Please refer to the above discussion and table 3 for obtaining the second resistance value according to the first resistance value, which is not described herein. The corresponding relationship between the second charging voltage, the second resistance value, the first ratio, the second ratio, and the first charging period is shown in table 13.

Watch 13

Second charging voltage	Second resistance value	First ratio	Second ratio	First charging period
					7	5	0.8	2.0	2.2
8	6	0.9	2.2	2.4
					……	……	……	……	……

As shown in table 13, the correspondence between the second charging voltage, the second resistance value, the first ratio, the second ratio, and the first charging period can be obtained. Namely, the acquired first charging time is the effective charging time of the display panel.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a charging test apparatus according to an embodiment of the present disclosure.

The embodiment of the application also provides a charging test device.

The charging test device includes: a first obtaining module 201, a second obtaining module 202, a third obtaining module 203 and a fourth obtaining module 204.

The first obtaining module 201 is configured to obtain a first charging voltage of the display panel during a charging process, where the first charging voltage is a maximum charging voltage during the charging process.

And a second obtaining module 202, configured to obtain a preset feedthrough voltage.

The third obtaining module 203 is configured to obtain a second charging voltage according to the first charging voltage and a preset feedthrough voltage.

Since the charging voltage of the display panel in the ideal charging process is guaranteed to be the maximum charging voltage. That is, the actual charging voltage according to the formula is the maximum charging voltage-feedthrough voltage of the display panel during ideal charging. The maximum charging voltage of the display panel during an ideal charging process is equal to the sum of the actual charging voltage and the feedthrough voltage. The loss of the charging voltage of the display panel during the actual charging process is corrected. That is, the maximum charging voltage of the display panel in the ideal charging process is the second charging voltage.

The fourth obtaining module 204 is configured to obtain the first charging duration according to the second charging voltage and a preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the second charging voltage and the first charging duration.

When the display panel is charged by the second charging voltage, no loss is generated. And obtaining the charging time length according to the second charging voltage, wherein the obtained charging time length is the maximum charging time length which can be obtained by the display panel in an ideal process, namely the effective charging time. The charging time for setting the display panel is defined as the effective charging time, i.e., the case of preventing the display panel from being insufficiently charged or being erroneously charged.

The unit of the charging time period described above may be in units of microseconds, seconds, minutes, or hours. For example 10 microseconds, 20 seconds, 600 minutes or 5 hours.

In some embodiments, the fourth obtaining module 204 is configured to obtain the first charging duration according to the second charging voltage and the preset corresponding relationship, and the fourth obtaining module 204 further includes the following steps:

acquiring a first resistance value of the display panel;

and acquiring the first charging time according to the second charging voltage, the second resistance value and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second charging voltage, the second resistance value and the first charging time.

and acquiring the first charging time according to the second charging voltage, the ratio and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage, the ratio and the first charging time.

In some embodiments, the fourth obtaining module 204 is configured to obtain the first charging duration according to the second charging voltage, the ratio and the preset corresponding relationship, and the fourth obtaining module 204 further includes the following steps:

acquiring a first resistance value of the display panel;

and acquiring the first charging time according to the second charging voltage, the ratio, the second resistance value and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage, the ratio, the second resistance value and the first charging time.

In some embodiments, the charging process includes a constant voltage charging phase. The first charging voltage is a charging voltage of a constant voltage charging stage. The preset corresponding relationship comprises a first sub-preset corresponding relationship and a second sub-preset corresponding relationship. A fourth obtaining module 204, configured to obtain the first charging duration according to the second charging voltage and the preset corresponding relationship, where the fourth obtaining module 204 further includes the following steps:

acquiring a first resistance value of the display panel;

and acquiring the first charging time according to the charging time set, the second resistance value and a second sub-preset corresponding relation, wherein the second sub-preset corresponding relation comprises the corresponding relation between the charging time set, the second resistance value and the first charging time.

In some embodiments, the fourth obtaining module 204 is configured to obtain the charging duration set according to the second charging voltage and the first preset sub-correspondence, and the fourth obtaining module 204 further includes the following steps:

and acquiring a charging time length set according to the second charging voltage, the ratio and a first sub-preset corresponding relation, wherein the first sub-preset corresponding relation comprises the corresponding relation among the second charging voltage, the ratio and the charging time length set.

In some embodiments, the charging process includes a first phase, a constant voltage charging phase, and a second phase, which are performed in sequence. The first stage is a stage in which the charging voltage gradually increases. The second stage is a stage in which the charging voltage is gradually decreased. The display panel includes scan lines and data lines. The first charging voltage is a charging voltage when the scanning line is in a constant voltage charging stage. A fourth obtaining module 204, configured to obtain the first charging duration according to the second charging voltage and the preset corresponding relationship, where the fourth obtaining module 204 further includes the following steps:

acquiring a fourth charging voltage when the data line is in a constant voltage charging stage;

acquiring a fifth charging voltage when the scanning line is in the second stage;

obtaining a sixth charging voltage according to the fourth charging voltage and a preset feed-through voltage;

and acquiring the first charging time according to the second charging voltage, the first ratio, the second ratio and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second charging voltage, the first ratio, the second ratio and the first charging time.

In some embodiments, the preset correspondence includes a third sub-preset correspondence and a fourth sub-preset correspondence. A fourth obtaining module 204, configured to obtain the first charging duration according to the second charging voltage, the first ratio, the second ratio, and a preset corresponding relationship, where the fourth obtaining module 204 further includes the following steps:

acquiring a second charging time length according to the second charging voltage, the first ratio and a third sub-preset corresponding relation, wherein the third sub-preset corresponding relation comprises the corresponding relation among the second charging voltage, the first ratio and the second charging time length;

and acquiring the first charging time length according to the third charging time length and the second charging time length.

In some embodiments, the fourth obtaining module 204 is configured to obtain the first charging duration according to the second charging voltage, the first ratio, the second ratio and the preset corresponding relationship, and the fourth obtaining module 204 further includes the following steps:

acquiring a first resistance value of the display panel;

and acquiring the first charging time according to the second resistance value, the second charging voltage, the first ratio, the second ratio and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation among the second resistance value, the second charging voltage, the first ratio, the second ratio and the first charging time.

The application provides a charging test method and a charging test device, including: the method comprises the steps of obtaining a first charging voltage of a display panel in a charging process. Wherein the first charging voltage is the maximum charging voltage in the charging process; a predetermined feed-through voltage is obtained. And acquiring a second charging voltage according to the first charging voltage and the preset feed-through voltage. And acquiring a first charging time length according to the second charging voltage and the first preset corresponding relation. The first preset corresponding relation comprises a corresponding relation between the second charging voltage and the first charging time length. This application passes through the biggest charging voltage in the charging process, and first charging voltage promptly and predetermine feed through voltage, acquire the second charging voltage. And acquiring a first charging time length according to the second charging voltage and the first preset corresponding relation. The charging time length is set as the charging time length of the display panel with the refresh frequency of 120 Hz, namely, the display panel with the refresh frequency of 120 Hz cannot be insufficiently charged or seriously mistakenly charged in the charging process in the charging time length.

The charging test method and the charging test device provided by the embodiment of the application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A charging test method is applied to a display panel and is characterized by comprising the following steps:

acquiring a preset feed-through voltage;

and acquiring a first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length, and the first charging time length is the charging time length of the display panel with the refreshing frequency of 120 Hz.

2. The charging test method according to claim 1, wherein the step of obtaining the first charging duration according to the second charging voltage and a preset correspondence comprises:

acquiring a first resistance value of the display panel;

3. The charging test method according to claim 1, wherein the step of obtaining the first charging duration according to the second charging voltage and a preset correspondence comprises:

4. The charging test method according to claim 3, wherein the step of obtaining the first charging duration according to the second charging voltage, the ratio and a preset correspondence comprises:

acquiring a first resistance value of the display panel;

5. The charging test method according to claim 1, wherein the charging process includes a constant voltage charging stage, the first charging voltage is a charging voltage of the constant voltage charging stage, the preset correspondence relationship includes a first sub-preset correspondence relationship and a second sub-preset correspondence relationship, and the step of obtaining the first charging duration according to the second charging voltage and the preset correspondence relationship includes:

acquiring a first resistance value of the display panel;

6. The charging test method according to claim 5, wherein the step of obtaining the set of charging durations according to the second charging voltage and the first sub-preset correspondence comprises:

7. The charging test method according to claim 1, wherein the charging process includes a first stage, a constant voltage charging stage and a second stage, which are sequentially performed, the first stage is a stage in which the charging voltage is gradually increased, the second stage is a stage in which the charging voltage is gradually decreased, the display panel includes a scan line and a data line, the first charging voltage is a charging voltage when the scan line is in the constant voltage charging stage, and the step of obtaining the first charging duration according to the second charging voltage and a preset correspondence includes;

acquiring a fifth charging voltage of the scanning line in the second stage;

8. The charging test method according to claim 7, wherein the preset correspondence includes a third sub-preset correspondence and a fourth sub-preset correspondence, and the step of obtaining the first charging duration according to the second charging voltage, the first ratio, the second ratio, and the preset correspondence includes:

9. The charging test method according to claim 7, wherein the step of obtaining a first charging duration according to the second charging voltage, the first ratio, the second ratio, and a preset correspondence includes;

acquiring a first resistance value of the display panel;

10. A charging test device, comprising:

the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a first charging voltage of a display panel in a charging process, and the first charging voltage is the maximum charging voltage in the charging process;

and the fourth acquisition module is used for acquiring the first charging time length according to the second charging voltage and a preset corresponding relation, wherein the preset corresponding relation comprises the corresponding relation between the second charging voltage and the first charging time length, and the first charging time length is the charging time length of the display panel with the refreshing frequency of 120 Hz.