Method and system for measuring the response time of a liquid crystal display

• US 9,269,287 B2
• Filed: 06/27/2013
• Issued: 02/23/2016
• 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
• Primary Examiner(s): Dharia, Prabodh M
• Application Number:
  US14/007,975
• Publication Number:
  US 20140285534A1
• Time in Patent Office: 971 Days
• Field of Search: 345 752-102, 345/207, 345/208, 345/589, 345690-692, 349/25, 349/33, 349/172, 315/169.3, 315/291, 313/501, 313/503
• US Class Current: 1/1
• 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, comprising the following steps:

step A;

the LCD displaying a preset image in a controlled manner;

step B;

obtaining a first and second luminance values of the LCD when displaying the preset image, and outputting a luminance-time curve in which the second luminance value changes over the time;

wherein, the first and second luminance values are respectively measured by a standard luminance measuring device and an actual luminance measuring device, the standard luminance measuring device is configured to measure a luminance-gray scale characteristic of the LCD, and the actual luminance measuring device is configured to measure a luminance-time characteristic of the LCD; and

step C;

correcting the luminance-time curve to obtain a corrected luminance-time curve by replacing the second luminance value in the luminance-time curve with a corrected luminance value, and calculating the response time of the LCD according to the corrected luminance-time curve;

wherein the corrected luminance value is obtained with the following steps;

step C1;

constructing a matching function between the first luminance value and the second luminance value, wherein the first luminance value is a dependent variable and the second luminance value is an independent variable; and

step C2;

calculating the corrected luminance value according to the matching function constructed, wherein the corrected luminance value is the dependent variable and the second luminance value is the independent variable.

2. The method for measuring the response time of an LCD according to claim 1, wherein, the step C1 comprises the following sub-steps:

constructing the matching function in form of an equation y=f(x)=A+Bx+Cx²+Dx³, wherein the first luminance value is used as the dependent variable y, the second luminance value is used as the independent variable x, 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.

3. A system for measuring the response time of an LCD, comprising

a server,

a standard luminance measuring device configured to measure a luminance-gray scale characteristic of the LCD and to output a first luminance value to the server, and

an actual luminance measuring device configured to measure a luminance-time characteristic of the LCD and to output a second luminance value to the server;

wherein, the standard luminance measuring device and the actual luminance measuring device are electrically connected to the server respectively;

wherein, the server includes;

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

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

a correcting module for correcting the luminance-time curve to generate a corrected luminance-time curve by replacing the second luminance value in the luminance-time curve with a corrected luminance value, and for calculating the response time of the LCD according to the corrected luminance-time curve;

and wherein, the correcting module comprises;

a data computing module for constructing a matching function between the first luminance value and the second luminance value, wherein the first luminance value is a dependent variable and the second luminance value is an independent variable, and for calculating the corrected luminance value according to the matching function constructed, wherein the corrected luminance value is the dependent variable and the second luminance value is the independent variable; and

a data processing module for correcting the luminance-time curve to generate the corrected luminance-time curve by replacing the second luminance value in the luminance-time curve with the corrected luminance value calculated, and for calculating the response time of the LCD according to the corrected luminance-time curve.

4. The system for measuring the response time of an LCD according to claim 3, wherein, the processing module comprises:

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

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

5. The system for measuring the response time of an LCD according to claim 3, wherein, while the data computing module is constructing the matching function to obtain the corrected luminance value, the following operations are implemented:

constructing the matching function in form of an equation y=f(x)=A+Bx+Cx²+Dx³, wherein the first luminance value is used as the dependent variable y, the second luminance value is used as the independent variable x, 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 the corrected luminance value according to the matching function, wherein the corrected luminance value is the dependent variable and the second luminance value is the independent variable.