Measurement device for measuring gray-to-gray response time

• US 7,768,510 B2
• Filed: 10/26/2006
• Issued: 08/03/2010
• Est. Priority Date: 01/27/2006
• Status: Active Grant

• Current Assignee: Xueshan Technologies Inc. (Wi-LAN Inc.)
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: Chen, Yi-Fan, Tsai, Tsung-Yu, Tsai, Tsung-Yi
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Edwards; Carolyn R
• Application Number:
  US11/586,650
• Publication Number:
  US 20070176871A1
• Time in Patent Office: 1,377 Days
• Field of Search: 345/207, 348/189
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• 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 3/2007 Display of intermediate tones

Abstract

The present invention discloses a measurement device for measuring the gray-to-gray response time. The measurement device is capable of precisely measuring the gray-to-gray response time of an LCD. According to a video signal comprising a synchronous message, the measurement device obtains the initial time and the final time of each gray-to-gray response time interval in the transition of LCD luminance, so as to achieve synchronous measurement of the LCD gray-to-gray response time.

Claims

1. A measurement device for measuring a gray-to-gray response time of a liquid crystal display (LCD), the measurement device comprising:

a signal generating unit for generating a video signal comprising a synchronous message;

a data processing unit coupled to the signal generating unit for recording the synchronous message and controlling the LCD to generate an optic signal according to the video signal; and

a data acquisition unit coupled to the data processing unit for converting the optic signal into a digital data so that the data processing unit measures the gray-to-gray response time of the LCD according to the synchronous message and the digital data.

2. The measurement device as recited in claim 1, wherein the synchronous message is a vertical synchronous signal.

3. The measurement device as recited in claim 1, wherein the data processing unit comprises:

an I/O interface for signal inputting or outputting;

a scaler for performing a scaling operation on the video signal; and

a micro-controller for generating a sampling command capable of being synchronized with the synchronous message according to the synchronous message.

4. The measurement device as recited in claim 3, wherein the micro-controller adjusts a sampling rate of the sampling command according to the signal generating unit.

5. The measurement device as recited in claim 1, wherein the I/O interface comprises a plurality of I/O ports.

6. The measurement device as recited in claim 3, wherein the data processing unit further comprises a signal converter for converting the video signal into an output signal.

7. The measurement device as recited in claim 6, wherein the output signal is a transition-minimized differential signal.

8. The measurement device as recited in claim 6, wherein the output signal is a low-voltage differential signal.

9. The measurement device as recited in claim 6, wherein the output signal is a reduced-swing differential signal.

10. The measurement device as recited in claim 3, wherein the data processing unit further comprises a memory for storing the synchronous message and the digital data.

11. The measurement device as recited in claim 1, wherein the data acquisition unit comprises:

an optic sensor for sensing the optic signal and converting the optic signal into a current signal;

a current-voltage converter for converting the current signal into a voltage signal;

a gain amplifier for amplifying the voltage signal; and

an analog-to-digital converter for converting the voltage signal into the digital data according to a sampling command.

12. A measurement device for measuring a gray-to-gray response time of a liquid crystal display (LCD), the measurement device comprising:

a micro-controller for generating a sampling command capable of being synchronized with a synchronous message according to a video signal comprising the synchronous message;

a scaler for performing a scaling operation on the video signal so as to control the LCD to generate an optic signal;

a data acquisition unit for processing a signal recording information of the optic signal so as to output an electric signal; and

an analog-to-digital converter for converting the electric signal into a digital data according to the sampling command,

wherein the microcontroller measures the gray-to-gray response time of the LCD according to the synchronous message and the digital data.

13. The measurement device as recited in claim 12, wherein the synchronous message is a vertical synchronous signal.

14. The measurement device as recited in claim 12, wherein the video signal comprising the synchronous message is generated from a computer.

15. The measurement device as recited in claim 12, wherein the signal recording information of the optic signal is generated from an optic sensor.

16. The measurement device as recited in claim 12, wherein the data acquisition unit comprises:

a current-voltage converter for converting the signal recording information of the optic signal into the electric signal; and

a gain amplifier for amplifying the electric signal.

17. The measurement device as recited in claim 12, wherein the micro-controller adjusts a sampling rate of the sampling command.

18. The measurement device as recited in claim 12, further comprising a memory for storing the synchronous message and the digital data.