CN102708814B - Alternating-current test method and system for relation curve of voltage and transmittance of liquid crystal display (LCD) module - Google Patents

Abstract

The invention provides a Module? The AC testing method and system of VT, including: A, determining the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle; B, sending the Nth actual voltage value to the Voltage source, control the square wave AC voltage corresponding to the output of the voltage source to pressurize the Data signal of the LCD module (Module); C. At the end of the Nth test cycle, measure and read the brightness value of the LCD module, and Draw the VT curve corresponding to the Nth test cycle according to the Nth actual voltage value and the read luminance value; D, make N=N+1, return to step B; N is a positive integer. Through the present invention, it is possible to realize the Module? VT's AC test.

Description

AC test method and system for relationship curve between voltage and transmittance of LCD module

technical field

The present invention relates to liquid crystal display (LCD, Liquid Crystal Display) module (Module) test technology, particularly a kind of AC test method and system of the relationship curve (Module V-T) of voltage and transmittance of an LCD module.

Background technique

The Module V-T test is to measure the curve relationship between the voltage (V) of the Data signal of the LCD module (Module) and the transmittance (T) of the corresponding LCD panel (Panel) at this time, where the transmittance (T) = The brightness measured by the LCD module/the maximum brightness of the LCD module, the maximum brightness of the LCD module is also measured.

During the Module V-T test, the voltage of the Data signal is provided by the voltage source, and the voltage of the Gate signal is provided by the PCB of the module itself. The voltage of the Data signal is changed by changing the output voltage of the voltage source, thereby changing the brightness of the module; the transmittance of the LCD Panel is obtained by measuring the brightness of the module, so as to obtain the V-T curve. The backlight of the Module V-T test is provided by the module itself, and the voltage of the Data signal is a DC voltage.

Module V-T test is already an indispensable part of gamma tuning (Gamma Tuning) in the liquid crystal industry. According to the Module V-T curve, the voltage loaded on the Data signal can be displayed in the correct gray scale; The relationship fits a certain Gamma curve. In the current test, the automatic test of DC Module V-T has been realized by using the VBA (Visual Basic For Application) technology of Excel, but the AC test of Module V-T is difficult to realize.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a Module V-T AC testing method and system to solve the problem that the Module V-T AC testing is difficult to achieve.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a kind of AC testing method of Module V-T, and this method comprises:

A. Determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle;

B. In the Nth test cycle, send the Nth actual voltage value to the voltage source, and control the voltage source to output the corresponding square wave AC voltage to the liquid crystal display (LCD) module (Module). The Data signal is pressurized;

C. At the end of the Nth test cycle, measure and read the brightness value of the LCD module, and draw the corresponding voltage value of the Nth test cycle according to the Nth actual voltage value and the read brightness value V-T curve;

D, make N=N+1, return to step B;

Wherein, the N is a positive integer.

Wherein, before said step A, the method also includes:

Initializing the reference voltage value, voltage deviation value, initial voltage value and voltage change step size required for determining the actual voltage value;

The initial voltage value is the sum of the reference voltage value and the voltage deviation value.

The actual voltage value includes a high voltage value and a low voltage value;

The high voltage value and the low voltage value are symmetrical with respect to the initial voltage value.

Described step A comprises:

Determine the total number of test cycles as: Int (initial voltage value/voltage change step size)+1;

Setting the actual voltage value of the first test cycle: the high voltage value is equal to the initial voltage value, and the low voltage value is equal to the initial voltage value;

Determine the actual voltage values corresponding to the second to Int (initial voltage value/voltage change step size)+1 test cycle: the high voltage value is based on the initial voltage value according to the voltage change step size Incrementing according to the test period, the low voltage value is based on the initial voltage value and decrementing according to the voltage change step according to the test period.

The maximum value of N is Int(initial voltage value/voltage change step size)+1.

In the step B, the Nth actual voltage value is sent to the voltage source, which is:

Step B11, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B12, waiting for a preset time interval;

Step B13, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B14, waiting for the preset time interval;

or,

Step B21, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B22, waiting for a preset time interval;

Step B23, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B24, waiting for the preset time interval.

The method further includes: in the Nth test period, repeatedly executing the steps B11 to B14 or repeatedly executing the steps B21 to B24 according to a preset number of cycles.

In the step B, the corresponding square wave AC voltage output by the control voltage source is:

Step B31, the voltage source outputs a corresponding square wave AC voltage according to the received high voltage value of the Nth actual voltage value, and lasts for the preset time interval;

Step B32, the voltage source outputs a corresponding square wave AC voltage according to the received low voltage value of the Nth actual voltage value, and lasts for the preset time interval;

or,

Step B41, the voltage source outputs a corresponding square wave AC voltage according to the received low voltage value of the Nth actual voltage value, and lasts for the preset time interval;

Step B42, the voltage source outputs a corresponding square wave AC voltage according to the received high voltage value of the Nth actual voltage value, and lasts for the preset time interval.

The method further includes: in the Nth test period, the voltage source repeatedly executes the steps B31 to B32 or repeatedly executes the steps B41 to B42 according to a preset number of cycles.

The present invention also provides a kind of AC test system of Module V-T, comprising: VBA function module, voltage source and color analyzer; Wherein,

The VBA function module is used to determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle;

In the Nth test period, the VBA function module is also used to perform operation A: send the Nth actual voltage value to the voltage source, and control the voltage source to output a corresponding square wave AC voltage;

The voltage source is used to perform operation B: output a corresponding square wave AC voltage to pressurize the Data signal of the LCD module (Module) according to the actual voltage value sent by the VBA function module;

The color analyzer is used to perform operation C: at the end of the Nth test period, measure and read the brightness value of the LCD module, and provide the brightness value to the VBA function module;

The VBA function module is also used to perform operation D: at the end of the Nth test cycle, draw the V-T corresponding to the Nth test cycle according to the brightness value of the LCD module provided by the color analyzer and the actual voltage value curve;

At the end of the Nth test period, the VBA function module, the voltage source and the color analyzer are further configured to perform the operations A to D corresponding to the N=N+1th test period.

Wherein, the VBA function module is also used to initialize the reference voltage value, voltage deviation value, initial voltage value and voltage change step size required for determining the actual voltage value; the initial voltage value is the reference voltage value and the sum of the voltage offset value.

The actual voltage value includes a high voltage value and a low voltage value;

The high voltage value and the low voltage value are symmetrical with respect to the initial voltage value.

The VBA function module is also used to determine the total number of test cycles as: Int (initial voltage value/voltage change step size)+1;

It is also used to set the actual voltage value of the first test cycle: the high voltage value is equal to the initial voltage value, and the low voltage value is equal to the initial voltage value;

Determine the actual voltage values corresponding to the second to Int (initial voltage value/voltage change step size)+1 test cycle: the high voltage value is based on the initial voltage value according to the voltage change step size Incrementing according to the test period, the low voltage value is based on the initial voltage value and decrementing according to the voltage change step according to the test period.

The maximum value of N is Int(initial voltage value/voltage change step size)+1.

The VBA function module is also used to repeatedly execute the following steps B11 to B14, or repeatedly execute the following steps B21 to B24 according to the preset number of cycles:

Step B11, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B12, waiting for a preset time interval;

Step B13, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B14, waiting for the preset time interval;

or,

Step B21, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B22, waiting for a preset time interval;

Step B23, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B24, waiting for the preset time interval.

The voltage source is also used to repeatedly execute the following steps B31 to B32, or repeatedly execute the following steps B41 to B42 according to the preset number of cycles:

Step B31, the source outputs a corresponding square wave AC voltage according to the received high voltage value of the Nth actual voltage value, and lasts for the preset time interval;

Step B32, outputting a corresponding square wave AC voltage according to the received low voltage value of the Nth actual voltage value, and continuing for the preset time interval;

or,

Step B41, outputting a corresponding square wave AC voltage according to the received low voltage value of the Nth actual voltage value, and continuing for the preset time interval;

Step B42, according to the received high voltage value of the Nth actual voltage value, output a corresponding square wave AC voltage, and last for the preset time interval.

The AC testing method and system of Module V-T provided by the present invention utilizes the VBA function of Excel to control the voltage source to output a square wave AC voltage to pressurize the Data signal of the LCD module; after the Data is pressurized for a test period, the brightness of the LCD module is performed Read, then change the voltage value and pressurize Data for a test cycle before reading the brightness of the LCD module, and so on, and finally complete the Module V-T AC test. In this way, the AC test of Module V-T can provide more powerful test data support for Gamma Tuning of Thin Film Field Effect Transistor LCD (TFT-LCD, Thin Film Transistor-LCD), thus supporting the realization of Module V-T AC test.

Description of drawings

Fig. 1 is the AC test flowchart of Module V-T of the present invention;

Fig. 2 is the flow chart of the AC test of the Module V-T of Embodiment 1 of the present invention;

Fig. 3 realizes the test result schematic diagram of the exchange test of Module V-T for the present invention by the VBA function of Excel;

Fig. 4 is the flow chart of the AC test of the Module V-T of the second embodiment of the present invention;

Fig. 5 is a schematic diagram of the square wave AC voltage output by the voltage source in the AC test of the Module V-T of the present invention.

detailed description

The basic thought of the AC testing method of Module V-T of the present invention is, utilizes the AC voltage of square wave form to realize the AC Module V-T test, specifically as shown in Figure 1, comprising:

Step A. Determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle.

Before this step, initialize the reference voltage value, voltage deviation value, initial voltage value and voltage change step size needed to determine the actual voltage value; wherein, the initial voltage value is the sum of the reference voltage value and the voltage deviation value; The voltage value, voltage deviation value and voltage change step are preset according to the test requirements.

Wherein, the actual voltage value includes a high voltage value and a low voltage value; the high voltage value and the low voltage value are symmetrical to the initial voltage value, that is, the output of the voltage source is a symmetrical square wave AC voltage.

After the above initialization operation, determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle, specifically:

First, determine the total number N of test cycles as: Int (initial voltage value/voltage change step size)+1; then the maximum value of N is Int (initial voltage value/voltage change step size)+1;

Secondly, set the actual voltage value of the first test cycle: the high voltage value is equal to the initial voltage value, and the low voltage value is equal to the initial voltage value;

Then, determine the actual voltage values corresponding to each of the second to Int (initial voltage value/voltage change step) + 1 test cycle: the high voltage value is based on the initial voltage value and according to the voltage change step according to the test cycle Incremental, the low voltage value is based on the initial voltage value and decreases according to the test cycle according to the voltage change step.

Step B. In the Nth test cycle, send the Nth actual voltage value to the voltage source, and control the voltage source to output a corresponding square wave AC voltage to pressurize the Data signal of the LCD module (Module).

Specifically, either of the following two methods can be used to send the Nth actual voltage value to the voltage source, and the voltage source is controlled to output a corresponding square wave AC voltage to pressurize the Data signal of the LCD module.

Method 1 includes the following steps:

Step B11, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B12, waiting for a preset time interval;

Step B13, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B14, waiting for a preset time interval.

It should be pointed out that the two preset time intervals are equal.

Further, in the Nth test period, step B11 to step B14 are repeatedly executed according to the preset number of cycles.

Correspondingly, after the voltage source receives the Nth actual voltage value, it will perform the following processing: the voltage source outputs the corresponding square wave AC voltage according to the high voltage value of the Nth actual voltage value received, and lasts for a preset time interval ; According to the received low voltage value of the Nth actual voltage value, output the corresponding square wave AC voltage and last for a preset time interval. Further, in the Nth test cycle, the voltage source repeatedly executes the above processing according to the preset number of cycles.

Method 2 includes the following steps:

Step B21, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B22, waiting for a preset time interval;

Step B23, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B24, waiting for a preset time interval.

It should be pointed out that the two preset time intervals are equal.

Further, in the Nth test cycle, step B21 to step B24 are repeatedly executed according to the preset number of cycles.

Correspondingly, after the voltage source receives the Nth actual voltage value, it will perform the following processing: the voltage source outputs the corresponding square wave AC voltage according to the low voltage value of the Nth actual voltage value received, and lasts for a preset time interval ; Output the corresponding square wave AC voltage according to the received high voltage value of the Nth actual voltage value, and last for a preset time interval. Further, in the Nth test cycle, the voltage source repeatedly executes the above processing according to the preset number of cycles.

It should be pointed out that the above preset number of cycles corresponding to each test cycle is the same.

Step C. At the end of the Nth test period, measure and read the luminance value of the LCD module, and draw the V-T curve corresponding to the Nth test period according to the Nth actual voltage value and the read luminance value.

Specifically, first draw the curve relationship between the square wave AC voltage output by the voltage source (that is, the voltage value for applying pressure to the Data signal) and the screen brightness (that is, the brightness value of the LCD module). The data needs to be converted into a relationship curve between voltage and transmittance, that is, a V-T curve. The specific drawing method is the same as that of the DC test, and will not be repeated here.

Step D, make N=N+1, return to step B;

Wherein, N is a positive integer. It should be pointed out that the maximum value of N is Int (initial voltage value/voltage change step size)+1, that is: when the Int (initial voltage value/voltage change step size)+1 test cycle ends, the test process complete.

It can be seen that in the present invention, in a complete test process, the above-mentioned preset time intervals corresponding to each test cycle are equal, and the preset cycle times are equal, that is, in the test process, the square wave output by the voltage source The frequency of the AC voltage is fixed; however, the actual voltage value of the square wave AC voltage corresponding to each test cycle is different.

In the present invention, the VBA function of Excel is mainly used to control the voltage source to output a square wave AC voltage, and the color analyzer is used to measure and read the brightness value of the LCD module, thereby realizing the automatic test of the AC Module V-T.

In the embodiment of the present invention, a complete Module V-T AC test process is divided into multiple test cycles.

The following takes the Nth test cycle as an example to illustrate the AC test method of the Module V-T of the present invention. Assumption: The voltage source determined by the VBA function module of Excel (referred to as the VBA function module) needs to output the Nth actual voltage value in the Nth test cycle: the high voltage value is 7.44V, and the low voltage value is 7.04V. Compared with the initial The voltage value is 7.24V symmetrical; the preset time interval t is 0.03 seconds, and the preset number of cycles is 4 times, as shown in Figure 2, the test process of the Nth test cycle includes:

Step 201, enter N test cycles;

Step 202, the VBA function module judges whether the current number K of sending the Nth actual voltage value to the voltage source is less than or equal to the preset number of cycles 4, if yes, enter step 203; otherwise, enter step 207;

Step 203, when K is less than or equal to 4, it means that the test cycle is not over yet, at this time, the VBA function module sends the high voltage value 7.44V to the voltage source;

Step 204, after waiting for t=0.03s, proceed to step 205; correspondingly, within the duration of 0.03s, the voltage source continuously outputs an AC voltage of 7.44V to pressurize the Data signal of the LCD module, and then proceed to step 205;

Step 205, the VBA function module sends the low voltage value 7.04V to the voltage source;

Step 206, after waiting for t=0.03s, return to step 202; within the duration of 0.03s, the voltage source continuously outputs an AC voltage of 7.04V to pressurize the Data signal of the LCD module, and then returns to step 202, that is: The Nth actual voltage value is again sent to the voltage source.

Step 207, following step 202, when K is greater than 4, the Nth test cycle ends, at this time, the color analyzer measures and reads the brightness value of the LCD module, and provides it to the VBA function module; then, the VBA function module Draw a V-T curve corresponding to the Nth test cycle according to the read brightness value and the Nth actual voltage value; wherein, the actual voltage value includes a high voltage of 7.44V and a low voltage of 7.04V.

After multiple test cycles, the V-T curve corresponding to the entire test process can be obtained, as shown in FIG. 3 .

In the test period of the above-mentioned embodiment, the VBA function module controls the voltage source to output square wave AC voltage in the order of high voltage value → low voltage value. Of course, it can also control the output direction of the voltage source in the order of low voltage value → high voltage value. Wave AC voltage.

A complete Module V-T AC test process of the present invention will be described below through specific embodiments. In this embodiment, the preset time intervals corresponding to each test cycle are equal, and the preset cycle times are equal. The testing process is divided into initialization phase and testing phase, as shown in Figure 3, first set up two button connection macros through the VBA function module: initialization and test start; as shown in Figure 4, the testing process includes:

Step 401, perform an initialization operation.

Press the button to connect the macro "initialization" to enter the initialization stage. In this stage, the following items need to be initialized: reference voltage value (Vcom), voltage deviation value (DVp), initial voltage value and voltage change step size (step) ,in:

Vcom and DVp are pre-calculated according to the test requirements, as shown in Figure 3, Vcom=7.04V, DVp=0.2V;

The initial voltage value is equal to Vcom+ΔVp. In the present invention, the actual voltage value of the square wave AC voltage that the voltage source needs to output in the first test cycle is set as the initial voltage value, that is, the high voltage value of the first test cycle is 7.24V, the low voltage value is 7.24V.

The step can be preset according to the test requirements, such as 0.1V, which means that in the current test process, the actual voltage value of the square wave AC voltage. The initial voltage value is based on the step and decreases according to the test cycle.

In addition, in the initialization stage, the color analyzer needs to be initialized and configured, and the color analyzer is used to measure the brightness of the LCD module and read the brightness value.

Taking CA210 as an example, the driver of CA210 needs to be installed, including some communication protocols and library functions set in CA210, etc. The configured functions are as follows:

Sub start()

Set objCa200＝New CA200

objCa200.AutoConnect

Set objCa＝objCa200.SingleCa

Set objProbe=objCa.SingleProbe

MsgBox objCa.ID

End Sub

After the initialization phase, enter the testing phase.

Step 402, after starting the test, determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test period.

Among them, the total number of test cycles I=Int (initial voltage value/voltage change step size)+1, that is, the value obtained by dividing the initial voltage value by the voltage change step size is rounded, indicating that the initial voltage value is calculated by the voltage change step size The number of times required to decrease to not less than 0, as shown in Figure 3, when the initial voltage value = 7.24V, step = 0.1V, I = Int(7.24/0.1) + 1 = 73, that is, there are 73 tests in the test process cycle.

Then, determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle, as shown in Figure 3, Volt (+) represents a high voltage value, and Volt (-) represents a low voltage value.

For the first test cycle: as mentioned above, set the actual voltage value of the square wave AC voltage that the voltage source needs to output in the first test cycle as the initial voltage value, that is, the high voltage value is 7.24V, and the low voltage value is 7.24 V;

For the 2nd to 73rd test cycle, the high voltage value of the actual voltage value of the square wave AC voltage is based on the initial voltage value and is incremented according to the test cycle according to the step, and the low voltage value is based on the initial voltage value according to the step according to the step The test cycle decreases, as shown in Figure 3, in the second test cycle, high voltage value = 7.34V, low voltage value = 7.14V; in the third test cycle, high voltage value = 7.44V, low voltage value = 7.04V, By analogy, the high voltage value=14.44V and the low voltage value=0.04V in the 73rd test cycle.

Further, as shown in FIG. 3 , the present invention fills the determined actual voltage values corresponding to each test cycle into the table made by the VBA function module.

In addition, the present invention also proposes the concept of relative voltage value: the relative voltage value is equal to the difference between the maximum value of the square wave voltage and the initial voltage value, as shown in Figure 3, the relative voltage value of the first test cycle is 7.24-7.24 =0V; the relative voltage value of the second test cycle is 7.34-7.24=0.1V, and so on, the relative voltage value corresponding to the 73rd test cycle is 14.44-7.24=7.2V.

Step 403, judge whether N is less than or equal to 1, if yes, execute steps 201 to 207.

After the actual voltage value of the symmetrical square wave AC voltage that the voltage source corresponding to each test cycle needs to output is filled, the actual voltage value is sent to the voltage source from the first cycle, and the voltage source is controlled to output a square wave AC voltage. First, it is necessary to judge whether the number N of the current test cycle (N is a positive integer, and the maximum value is 1) is less than or equal to the total number I of the test cycle, that is, to judge whether N is less than or equal to 1, and if so, enter the Nth test cycle , execute the test process of a single test cycle as shown in FIG. 2 , which will not be repeated here. In this embodiment, the square wave AC voltage output by the voltage source is shown in FIG. 5 .

In addition, in step 207, after the Nth test cycle is over, execute step 404, make N=N+1, enter the next test cycle, and return to step 403.

When N is greater than 1, it means that the entire testing process ends.

Of course, the testing process shown in FIG. 4 can also be performed multiple times, 5 times as shown in FIG. 3 .

In order to realize above-mentioned test method, the present invention also provides a kind of AC test system of Module V-T, comprising: VBA function module, voltage source and color analyzer; Wherein,

The VBA function module is used to determine the actual voltage value of the square wave AC voltage that the voltage source needs to output in each test cycle;

In the Nth test cycle,

The VBA function module is also used to perform operation A: send the Nth actual voltage value to the voltage source, and control the voltage source to output the corresponding square wave AC voltage;

The voltage source is used to perform operation B: according to the actual voltage value sent by the VBA function module, output the corresponding square wave AC voltage to pressurize the Data signal of the LCD module (Module);

The color analyzer is used to perform operation C: at the end of the Nth test period, measure and read the brightness value of the LCD module, and provide the brightness value to the VBA function module;

The VBA function module is also used to perform operation D: at the end of the Nth test cycle, draw the V-T curve corresponding to the Nth test cycle according to the brightness value and the actual voltage value of the LCD module provided by the color analyzer;

At the end of the Nth test period, the VBA function module, the voltage source and the color analyzer are also used to execute operations A to D corresponding to the N=N+1th test period.

Further, the VBA function module is also used to initialize the reference voltage value, voltage deviation value, initial voltage value and voltage change step size required for determining the actual voltage value; the initial voltage value is the sum of the reference voltage value and the voltage deviation value .

Wherein, the actual voltage value includes a high voltage value and a low voltage value; the high voltage value and the low voltage value are symmetrical to the initial voltage value.

The VBA function module is also used to determine the total number of test cycles as: Int (initial voltage value/voltage change step size)+1;

It is also used to set the actual voltage value of the first test cycle: the high voltage value is equal to the initial voltage value, and the low voltage value is equal to the initial voltage value;

Determine the actual voltage values corresponding to the second to Int (initial voltage value/voltage change step size) + 1 test cycle: the high voltage value is based on the initial voltage value and increases according to the test cycle according to the voltage change step size, The low voltage value is based on the initial voltage value and is decremented according to the test cycle according to the voltage change step. Wherein, the maximum value of N is Int (initial voltage value/voltage change step size)+1.

The VBA function module is also used to repeatedly execute the following steps B11 to B14, or repeatedly execute the following steps B21 to B24 according to the preset number of cycles:

Step B11, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B12, waiting for a preset time interval;

Step B13, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B14, waiting for a preset time interval;

or,

Step B21, sending the low voltage value of the Nth actual voltage value to the voltage source;

Step B22, waiting for a preset time interval;

Step B23, sending the high voltage value of the Nth actual voltage value to the voltage source;

Step B24, waiting for a preset time interval.

The voltage source is also used to repeatedly perform the following processes according to a preset number of cycles:

According to the high voltage value of the Nth actual voltage value received, the corresponding square wave AC voltage is output and lasts for a preset time interval; according to the low voltage value of the Nth actual voltage value received, the corresponding square wave AC voltage is output voltage for a preset time interval;

Or, according to the received low voltage value of the Nth actual voltage value, output the corresponding square wave AC voltage and last for a preset time interval; according to the received high voltage value of the Nth actual voltage value, output the corresponding square wave AC voltage Wave AC voltage for a preset time interval.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (13)

1. A Module V-T AC test method is characterized in that the method comprises the following steps:

A. determining the actual voltage value of the square wave alternating voltage which is required to be output by the voltage source in each test period;

B. in the Nth test period, the Nth actual voltage value is sent to the voltage source, and the voltage source is controlled to output corresponding square wave alternating voltage to pressurize a Data signal of an LCD Module (Module);

C. measuring and reading the brightness value of the LCD module when the Nth test period is finished, and drawing a V-T curve corresponding to the Nth test period according to the Nth actual voltage value and the read brightness value;

D. adding 1 to the value of N, and returning to the step B;

wherein N is a positive integer;

in the step B, the nth actual voltage value is sent to the voltage source, and is:

step B11, sending the high voltage value of the Nth actual voltage value to the voltage source;

step B12, waiting for a preset time interval;

step B13, sending the low voltage value of the Nth actual voltage value to the voltage source;

step B14, waiting for the preset time interval;

or,

step B21, sending the low voltage value of the Nth actual voltage value to the voltage source;

step B22, waiting for a preset time interval;

step B23, sending the high voltage value of the Nth actual voltage value to the voltage source;

step B24, waiting for the preset time interval;

and in the Nth test period, repeatedly executing the steps B11 to B14 or repeatedly executing the steps B21 to B24 according to a preset cycle number.

2. The Module V-T AC testing method as claimed in claim 1, wherein before said step A, the method further comprises:

initializing a reference voltage value, a voltage deviation value, an initial voltage value and a voltage change step length which are required for determining the actual voltage value;

the initial voltage value is the sum of the reference voltage value and the voltage deviation value.

3. The Module V-T AC testing method as claimed in claim 2, wherein the actual voltage values include a high voltage value and a low voltage value;

the high voltage value and the low voltage value are symmetrical with respect to the initial voltage value.

4. The Module V-T AC testing method as recited in claim 3, wherein said step A comprises:

determining the total number of test cycles as: int (initial voltage value/voltage change step) + 1;

setting the actual voltage value of the 1 st test period as follows: the high voltage value is equal to the initial voltage value and the low voltage value is equal to the initial voltage value;

determining the actual voltage values corresponding to the 2 nd to the Int (initial voltage value/voltage change step) +1 test period as follows: the high voltage value is increased progressively according to the test period according to the voltage change step length on the basis of the initial voltage value, and the low voltage value is decreased progressively according to the test period according to the voltage change step length on the basis of the initial voltage value.

5. The Module V-T AC testing method as claimed in claim 4, wherein the maximum value of N is Int (initial voltage value/voltage variation step) + 1.

6. The alternating current testing method of the Module V-T according to claim 4 or 5, wherein the control voltage source in the step B outputs a corresponding square wave alternating current voltage as:

step B31, the voltage source outputs a corresponding square wave alternating voltage according to the received high voltage value of the Nth actual voltage value, and the preset time interval is continued;

step B32, the voltage source outputs a corresponding square wave alternating current voltage according to the low voltage value of the received Nth actual voltage value, and the preset time interval is continued;

or,

step B41, the voltage source outputs a corresponding square wave alternating current voltage according to the low voltage value of the received Nth actual voltage value, and the preset time interval is continued;

and step B42, the voltage source outputs corresponding square wave alternating current voltage according to the received high voltage value of the Nth actual voltage value, and the preset time interval is continued.

7. The Module V-T AC testing method as recited in claim 6, further comprising: in the Nth testing period, the voltage source repeatedly executes the steps B31 to B32 or the steps B41 to B42 according to a preset cycle number.

8. An AC test system of Module V-T, comprising: the VBA function module, the voltage source and the color analyzer; wherein,

the VBA functional module is used for determining the actual voltage value of the square wave alternating voltage which needs to be output by the voltage source in each test period;

in the nth test period, the VBA functional module is further configured to perform operation a: sending the Nth actual voltage value to the voltage source, and controlling the voltage source to output a corresponding square wave alternating voltage;

the voltage source to perform operation B: outputting corresponding square wave alternating voltage to pressurize a Data signal of an LCD Module (Module) according to the actual voltage value sent by the VBA functional Module;

the color analyzer is configured to perform operation C: measuring and reading the brightness value of the LCD module at the end of the Nth test period, and providing the brightness value to the VBA functional module;

the VBA functional module is further configured to perform operation D: when the Nth test period is finished, drawing a V-T curve corresponding to the Nth test period according to the brightness value of the LCD module provided by the color analyzer and the actual voltage value;

when the nth test period is finished, the VBA functional module, the voltage source and the color analyzer are further configured to perform operations a to D corresponding to the test period in which the value of N is increased by 1;

in the operation a, the nth actual voltage value is sent to the voltage source, and is:

step A11, sending the high voltage value of the Nth actual voltage value to the voltage source;

step A12, waiting for a preset time interval;

step A13, sending the low voltage value of the Nth actual voltage value to the voltage source;

step A14, waiting for the preset time interval;

or,

step A21, sending the low voltage value of the Nth actual voltage value to the voltage source;

step A22, waiting for a preset time interval;

step A23, sending the high voltage value of the Nth actual voltage value to the voltage source;

step A24, waiting for the preset time interval;

in the Nth testing period, the VBA functional module repeatedly executes the steps A11 to A14 or the steps A21 to A24 according to a preset number of cycles.

9. The Module V-T AC test system of claim 8, wherein the VBA function Module is further configured to initialize the reference voltage value, the voltage offset value, the initial voltage value, and the voltage change step size required to determine the actual voltage value; the initial voltage value is the sum of the reference voltage value and the voltage deviation value.

10. The Module V-T ac test system of claim 9, wherein the actual voltage values include a high voltage value and a low voltage value;

the high voltage value and the low voltage value are symmetrical with respect to the initial voltage value.

11. The Module V-T AC test system of claim 10,

the VBA functional module is further configured to determine that the total number of test cycles is: int (initial voltage value/voltage change step) + 1;

and the method is also used for setting the actual voltage value of the 1 st test period as follows: the high voltage value is equal to the initial voltage value and the low voltage value is equal to the initial voltage value;

determining the actual voltage values corresponding to the 2 nd to the Int (initial voltage value/voltage change step) +1 test period as follows: the high voltage value is increased progressively according to the test period according to the voltage change step length on the basis of the initial voltage value, and the low voltage value is decreased progressively according to the test period according to the voltage change step length on the basis of the initial voltage value.

12. The Module V-T AC test system of claim 11, wherein the maximum value of N is Int (initial voltage value/voltage change step) + 1.

13. The Module V-T AC test system of claim 11 or 12,

the voltage source is further configured to repeatedly execute the following steps B31 to B32 or the following steps B41 to B42 according to the preset number of cycles:

step B31, outputting a corresponding square wave alternating current voltage according to the received high voltage value of the Nth actual voltage value, and continuing for the preset time interval;

step B32, outputting a corresponding square wave alternating current voltage according to the received low voltage value of the Nth actual voltage value, and continuing for the preset time interval;

or,

step B41, outputting a corresponding square wave alternating current voltage according to the received low voltage value of the Nth actual voltage value, and continuing for the preset time interval;

and step B42, outputting the corresponding square wave alternating voltage according to the received high voltage value of the Nth actual voltage value, and continuing for the preset time interval.