METHOD AND SYSTEM FOR MEASURING THE RESPONSE TIME OF A LIQUID CRYSTAL DISPLAY

• US 20140285534A1
• Filed: 06/27/2013
• Published: 09/25/2014
• Est. Priority Date: 03/22/2013
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Dai, Ye, Kang, Chi-Tsung
• Granted Patent: US 9,269,287 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A method and system for measuring the response time of an LCD are provided. The method comprises the following steps: step A: controlling the LCD to display a preset image; step B: obtaining the luminance of the LCD that is displaying the preset image, and outputting a luminance-time curve in which the luminance changes over the time; step C: correcting the luminance-time curve to obtain a corrected luminance-time curve, and calculating the response time of the LCD according to the corrected luminance-time curve. When implementing the present application, the measuring errors about the response time of the system for measuring the response time, which are resulted from using different actual luminance measuring devices, can be reduced or eliminated.

Claims

1. A method for measuring the response time of an LCD, wherein it comprises the following steps:

step A;

controlling the LCD to display a preset image;

step B;

obtaining the luminance of the LCD that is displaying the preset image, and outputting a luminance-time curve in which the luminance changes over the time;

step C;

correcting the luminance-time curve to obtain a corrected luminance-time curve, and calculating the response time of the LCD according to the corrected luminance-time curve.

2. The method for measuring the response time of an LCD according to claim 1, wherein, the step B comprises:

obtaining first luminance values measured by a standard luminance measuring device;

obtaining second luminance values measured by an actual luminance measuring device, and outputting a second luminance value-time curve according to the change of the second luminance values over the time.

3. The method for measuring the response time of an LCD according to claim 2, wherein, the step C comprises:

step C1;

constructing a matching function with the first luminance values as the dependent variable and the second luminance values as the independent variable, and obtaining LCD luminance values according to the matching function, wherein the LCD luminance values are the corrected second luminance value;

step C2;

correcting the second luminance value-time curve with the LCD luminance values to generate an LCD luminance value-time curve, and calculating the response time of the LCD according to the LCD luminance value-time curve, wherein the LCD luminance value-time curve is the corrected second luminance value-time curve.

4. The method for measuring the response time of an LCD according to claim 3, wherein, the step C1 comprises the following sub-steps:

constructing a matching function in form of the equation y=f(x)=A+Bx+Cx²+Dx³, wherein the first luminance values are used as the dependent variable y, the second luminance values are used as the independent variable, and the A, B, C, D are constants;

calculating the values of the constants A, B, C and D through curve-fitting method to ascertain the matching function;

calculating a set of the first luminance values according to the matching function, wherein there is a one-to-one relationship between the first luminance values and the second luminance values, and the set of the first luminance values are referred as the LCD luminance values.

5. The method for measuring the response time of an LCD according to of claim 4, wherein, the step C2 comprises the following sub-steps:

obtaining the second luminance value-time curve;

substituting the LCD luminance values in the second luminance value-time curve to generate the LCD luminance value-time curve;

calculating the response time of the LCD according to the LCD luminance value-time curve.

6. A method for measuring the response time of an LCD, wherein it comprises the following steps:

step A;

controlling the LCD to display a preset image;

step B;

obtaining the luminance of the LCD that is displaying the preset image, and outputting an luminance-time curve in which the luminance changes over the time;

step C;

constructing a matching function with first luminance values as the dependent variable and second luminance values as the independent variable;

obtaining an LCD luminance value according to the matching function, wherein the LCD luminance values are the corrected second luminance value;

step D;

correcting the second luminance value-time curve with the LCD luminance values to generate an LCD luminance value-time curve, and calculating the response time of the LCD according to the LCD luminance value-time curve, wherein the LCD luminance value-time curve is a corrected second luminance value-time curve.

7. The method for measuring the response time of an LCD according to claim 6, wherein, the step C comprises the following sub-steps:

constructing a matching function in form of the equation y=f(x)=A+Bx+Cx²+Dx³, wherein the first luminance values are used as the dependent variable y, the second luminance values are used as the independent variable, and the A, B, C, D are constants;

calculating the values of the constants A, B, C and D through curve-fitting method to ascertain the matching function;

calculating a set of the first luminance values according to the matching function, wherein there is a one-to-one relationship between the first luminance values and the second luminance values, and the set of the first luminance values are referred as the LCD luminance values.

8. The method for measuring the response time of an LCD according to claim 7, wherein, the step D comprises the following sub-steps:

obtaining the second luminance value-time curve;

substituting the LCD luminance values in the second luminance value-time curve to generate the LCD luminance value-time curve;

calculating the response time of the LCD according to the LCD luminance value-time curve.

9. A system for measuring the response time of an LCD, wherein it comprises a server, a standard luminance measuring device, and an actual luminance measuring device, and the standard luminance measuring device and the actual luminance measuring device are electrically connected to the server respectively;

the server includes;

a control module for controlling the LCD to display a preset image;

a processing module for obtaining the luminance of the LCD that is displaying the preset image and outputting a luminance-time curve in which the luminance changes over the time; and

a correcting module for correcting the luminance-time curve to generate a corrected luminance-time curve, and for calculating the response time of the LCD according to the corrected luminance-time curve.

10. The system for measuring the response time of an LCD according to claim 9, wherein, the processing module comprises:

a first processing module for obtaining first luminance values measured by the standard luminance measuring device;

a second processing module for obtaining second luminance values measured by an actual luminance measuring device, and outputting a second luminance value-time curve according to the change of the second luminance values over the time.

11. The system for measuring the response time of an LCD according to claim 10, wherein, the correcting module comprises:

a data computing module for constructing a matching function with the first luminance values as the dependent variable and the second luminance values as the independent variable, and for obtaining LCD luminance values according to the matching function, wherein the LCD luminance values are the corrected second luminance values;

a data processing module for correcting the second luminance value-time curve with the LCD luminance values to generate an LCD luminance value-time curve, and for calculating the response time of the LCD according to the LCD luminance value-time curve, wherein the LCD luminance value-time curve is the corrected second luminance value-time curve.

12. The system for measuring the response time of an LCD according to claim 11, wherein, while the data computing module is constructing the matching function with the first luminance value as the dependent variable and the second luminance value as the independent variable to obtain the LCD luminance value, it is implementing the following operations:

constructing a matching function in form of the equation y=f(x)=A+Bx+Cx²+Dx³, wherein the first luminance values are used as the dependent variable y, the second luminance values are used as the independent variable, and the A, B, C, D are constants;

calculating the values of the constants A, B, C and D through curve-fitting method to ascertain the matching function;

calculating a set of the first luminance values according to the matching function, wherein there is a one-to-one relationship between the first luminance values and the second luminance values, and the set of the first luminance values are referred as the LCD luminance values.

13. The system for measuring the response time of an LCD according to claim 12, wherein, while the data processing module is correcting the second luminance value-time curve with the LCD luminance values to generate the LCD luminance value-time curve and calculating the response time of the LCD according to the LCD luminance value-time curve, it is implementing the following operations:

obtaining the second luminance value-time curve;

substituting the LCD luminance values in the second luminance value-time curve to generate the LCD luminance value-time curve;

calculating the response time of the LCD according to the LCD luminance value-time curve.