Liquid crystal display device and driving device thereof, and method for driving liquid crystal display device

• US 7,420,538 B2
• Filed: 12/01/2004
• Issued: 09/02/2008
• Est. Priority Date: 12/03/2003
• Status: Active Grant

• Current Assignee: Unified Innovative Technology, LLC
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Mizumaki, Hidetaka, Murao, Masayuki
• Primary Examiner(s): TRAN, MY CHAU T
• Application Number:
  US11/000,210
• Publication Number:
  US 20050122305A1
• Time in Patent Office: 1,371 Days
• Field of Search: 345/55, 345/84, 345/87, 345/89, 345/98, 345/100, 345/101, 349/56, 349/72
• US Class Current: 345/101
• CPC Class Codes: G02F 1/133382 Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A liquid crystal display device of the present invention includes (i) a temperature sensor provided in at least one of pixels in a displaying area of a display panel, (ii) a lead line buried in the display panel, for transmitting a detection signal from the temperature sensor to a vicinity of the display panel, (iii) a temperature measurement control section for measuring a pixel temperature based on the detection signal transmitted from the temperature sensor, (iv) a data signal line driving section for outputting the data signal to the data signal lines in accordance with the pixel temperature measured in the temperature measurement control section. Further, the liquid crystal display device of the present invention includes (i) a plurality of data generating sections for generating data signals of the different output levels based on an inputted video signal and a video signal that is at least one frame earlier than the inputted video signal, (ii) a data generating section containing section for containing therein the plurality of the data generating sections, and (iii) a memory for use in selecting one of the data generating sections on a line-by-line basis for the respective scan signal lines.

Claims

1. A liquid crystal display device including a plurality of scan signal lines, a plurality of data signal lines to which video signals are supplied as data signals, and a displaying section including pixels arranged in a matrix manner, the pixels respectively connected, via switching sections, with the scan signal lines and the data signal lines corresponding to intersecting points thereof, the liquid crystal display device comprising:

a temperature sensor provided in at least one of the pixels in a displaying region of the displaying section;

a lead line provided unnoticeably in the displaying section, for transmitting a detection signal from the temperature sensor to a peripheral section of the displaying section;

a temperature measurement control section for measuring a temperature based on the detection signal transmitted from the temperature sensor;

a data signal line driving section for outputting the data signal to the data signal lines in a manner based on the temperature measured in the temperature measurement control section; and

spare lines respectively corresponding to the data signal lines and branched to be connected with the data signal lines in such a manner that a ladder-like shape is formed with the spare lines and the data signal lines, the spare lines being for ensuring transmission of the data signal even if breaking occurs in a data signal line,

the spare lines also functioning as the lead line.

3. The liquid crystal display device as set forth in claim 1, wherein the temperature sensor is a thermister type sensor that has been built in the pixels by carrying out film formation to form element films from which the temperature sensor is formed.

4. The liquid crystal display device as set forth in claim 1, wherein:

the data-signal-line driving section supplies, to a data signal line, a data signal voltage larger than a target data signal voltage that corresponds to a gradation value indicated by the video signal.

5. The liquid crystal display device as set forth in claim 1, wherein the temperature sensor is provided in a vicinity of a scan signal line or in a vicinity of a data signal line.

2. A liquid crystal display device including a plurality of scan signal lines, a plurality of data signal lines to which video signals are supplied as data signals, and a displaying section including pixels arranged in a matrix manner, the pixels respectively connected, via switching sections, with the scan signal lines and the data signal lines corresponding to intersecting points thereof, the liquid crystal display device comprising:

a temperature sensor provided in at least one of the pixels in a displaying region of the displaying section;

a temperature measurement control section provided in a peripheral section of the displaying section, for measuring a pixel temperature based on the detection signal transmitted from the temperature sensor;

a lead line for transmitting a detection signal from the temperature sensor to the temperature measurement control section, the lead line unnoticeably provided in the displaying section;

data signal line driving section for outputting the data signal to the data signal lines in accordance with the temperature measured in the temperature measurement control section; and

spare lines respectively corresponding to the data signal lines and branched to be connected with the data signal lines in such a manner that a ladder-like shape is formed with the spare lines and the data signal lines, the spare lines being for ensuring transmission of the data signal even if breaking occurs in a data signal line,

the spare lines also functioning as the lead line.

6. A liquid crystal display device including a plurality of scan signal lines, a plurality of data signal lines to which video signals are supplied as data signals, and a displaying section including pixels arranged in a matrix manner, the pixels respectively connected, via switching sections, with the scan signal lines and the data signal lines corresponding to intersecting points thereof, the liquid crystal display device comprising:

a temperature sensor provided in at least one of the pixels in a displaying region of the displaying section;

a lead line provided unnoticeably in the displaying section, for transmitting a detection signal from the temperature sensor to a peripheral section of the displaying section;

a temperature measurement control section for measuring a temperature based on the detection signal transmitted from the temperature sensor;

a data, signal line driving section for outputting the data signal to the data signal lines in a manner based on the temperature measured in the temperature measurement control section, wherein

the temperature sensor is provided in a vicinity of a scan signal line or in a vicinity of a data signal line, and

the temperature sensor is shielded by a shielding member.

7. A liquid crystal display device including a plurality of scan signal lines, a plurality of data signal lines to which video signals are supplied as data signals, and a displaying section including pixels arranged in a matrix manner, the pixels respectively connected, via switching sections, with the scan signal lines and the data signal lines corresponding to intersecting points thereof, the liquid crystal display device comprising:

a temperature sensor provided in at least one of the pixels in a displaying region of the displaying section;

a lead line provided unnoticeably in the displaying section, for transmitting a detection signal from the temperature sensor to a peripheral section of the displaying section;

a temperature measurement control section for measuring a temperature based on the detection signal transmitted from the temperature sensor;

a data signal line driving section for outputting the data signal to the data signal lines in a manner based on the temperature measured in the temperature measurement control section;

a plurality of temperature sensors are provided in the pixels only in an area excluding a top H/4 of the displaying region and a bottom H/4 of the displaying region, where H is a height of the displaying region; and

the temperature is an average of a plurality of the detection signals transmitted from the plurality of the temperature sensor, the average calculated by the temperature measurement control section.

8. The liquid crystal display device as set forth in claim 7, wherein:

the plurality of the temperature sensor are dispersed 2-dimensionally over displaying area; and

the plurality of the temperature sensor are provided at substantially equal intervals in a horizontal direction of the displaying area.

9. The liquid crystal display device as set forth in claim 7, wherein the data signal lines are arranged at substantially equal intervals in that part of the display region which includes positions of the temperature sensors.

10. The liquid crystal display device as set forth in claim 7, wherein the plurality of the temperature sensor are arranged at substantially equal intervals in a vertical direction of the displaying area.

11. The liquid crystal display device as set forth in claim 8, wherein the plurality of the temperature sensor are arranged at substantially equal intervals in a vertical direction of the displaying area.

12. The liquid crystal display device as set forth in claim 9, wherein the plurality of the temperature sensor are arranged at substantially equal intervals in a vertical direction of the displaying area.

13. A method for driving a liquid crystal display device including a plurality of scan signal lines, a plurality of data signal lines to which video signals are supplied as data signals, and a displaying section including pixels arranged in a matrix manner, the pixels respectively connected, via switching sections, with the scan signal lines and the data signal lines corresponding to intersecting points thereof, the method comprising the steps of:

(I) measuring temperature based on a detection signal transmitted from a temperature sensor to a periphery of the displaying section via a lead wire buried in the displaying section, the temperature sensor provided in at least one of the pixels in a displaying area of the displaying section;

(II) driving the data signal lines by supplying the data signals to the data signal lines in accordance with the temperature of the pixels measured in the (I); and

(III) ensuring transmission of the data signal even if breaking occurs in a data signal line with spare lines respectively corresponding to the data signal lines and branched to be connected with the data signal lines in such a manner that a ladder-like shape is formed with the spare lines and the data signal lines, wherein the spare lines function as the lead wire.