Temperature sensing system integrated in liquid crystal display panel and liquid crystal display panel

• US 10,132,690 B2
• Filed: 04/13/2016
• Issued: 11/20/2018
• Est. Priority Date: 03/09/2016
• 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: Chen, Yuyeh, Chang, Yuhua, Chen, Mingwei
• Primary Examiner(s): Jagan, Mirellys
• Application Number:
  US15/039,412
• Publication Number:
  US 20180087971A1
• Time in Patent Office: 951 Days
• Field of Search: 374141, 374208, 374163
• CPC Class Codes: G01K 1/14 Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
• CPC Class Codes: G01K 7/04 the object to be measured not forming one of the thermoelectric materials
• CPC Class Codes: G02F 1/1309 Repairing; Testing
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G09G 2330/045 Protection against panel overheating
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

The present invention provides a temperature sensing system integrated in a liquid crystal display panel and a liquid crystal display panel. The temperature sensing system includes a sensing unit (11), located in a display region (1) of the liquid crystal display panel, and a calculation and control unit (12), located outside the display region (1); the sensing unit (11) includes a first metal conductor (A) and a second metal conductor (B) located in the display region (1), and as a short circuit point exists between the two, a voltage difference generates between the two, and the voltage difference is converted into a digital signal with an analog to digital converter (122) after it is amplified by an operational amplifier (121), and finally, the micro controller unit (123) processes the digital signal to obtain a temperature in the liquid crystal display panel and to determine whether the protect temperature is reached.

Claims

1. A temperature sensing system integrated in a liquid crystal display panel, comprising a sensing unit, located in a display region of the liquid crystal display panel, and a calculation and control unit, located outside the display region of the liquid crystal display panel and electrically coupled to the sensing unit;

wherein

the sensing unit comprises a first metal conductor and a second metal conductor located in the display region of the liquid crystal display panel, and materials of the first metal conductor and the second metal conductor are different;

the first metal conductor and the second metal conductor are a first metal line and a second metal line located on respective metal structures and respective wirings in the display region of the liquid crystal display panel;

or the first metal conductor and the second metal conductor are the respective metal structures and the respective wirings in the display region of the liquid crystal display panel; and

the calculation and control unit comprises an operational amplifier electrically coupled to the sensing unit, and an analog to digital converter electrically coupled to the operational amplifier, and a micro controller unit electrically coupled to the analog to digital converter.

2. The temperature sensing system integrated in the liquid crystal display panel according to claim 1, wherein the calculation and control unit is located on a printed circuit board outside the display region of the liquid crystal display panel.

3. The temperature sensing system integrated in the liquid crystal display panel according to claim 1, wherein the first metal conductor and the second metal conductor are electrically coupled to an in phase input end and an anti-phase input end of the operational amplifier, respectively;

an output end of the operational amplifier is electrically coupled to an input end of the analog to digital converter;

an output end of the analog to digital converter is electrically coupled to the micro controller unit.

4. The temperature sensing system integrated in the liquid crystal display panel according to claim 3, wherein connection lines among the first metal conductor, the second metal conductor and the operational amplifier, a connection line between the operational amplifier and the analog to digital converter, and a connection line between the analog to digital converter and the micro controller unit are all copper lines.

5. A liquid crystal display panel, having a temperature sensing system integrated in the liquid crystal display panel, and the temperature sensing system comprises a sensing unit, located in a display region of the liquid crystal display panel, and a calculation and control unit, located outside the display region of the liquid crystal display panel and electrically coupled to the sensing unit;

wherein

the sensing unit comprises a first metal conductor and a second metal conductor located in the display region of the liquid crystal display panel, and materials of the first metal conductor and the second metal conductor are different;

the first metal conductor and the second metal conductor are a first metal line and a second metal line located on respective metal structures and respective wirings in the display region of the liquid crystal display panel;

or the first metal conductor and the second metal conductor are the respective metal structures and the respective wirings in the display region of the liquid crystal display panel; and

the calculation and control unit comprises an operational amplifier electrically coupled to the sensing unit, and an analog to digital converter electrically coupled to the operational amplifier, and a micro controller unit electrically coupled to the analog to digital converter.

6. The liquid crystal display panel according to claim 5, wherein the calculation and control unit is located on a printed circuit board outside the display region of the liquid crystal display panel.

7. The liquid crystal display panel according to claim 5, wherein the first metal conductor and the second metal conductor are electrically coupled to an in phase input end and an anti-phase input end of the operational amplifier, respectively;

an output end of the operational amplifier is electrically coupled to an input end of the analog to digital converter;

an output end of the analog to digital converter is electrically coupled to the micro controller unit.

8. The liquid crystal display panel according to claim 7, wherein connection lines among the first metal conductor, the second metal conductor and the operational amplifier, a connection line between the operational amplifier and the analog to digital converter, and a connection line between the analog to digital converter and the micro controller unit are all copper lines.

9. A temperature sensing system integrated in a liquid crystal display panel, comprising a sensing unit, located in a display region of the liquid crystal display panel, and a calculation and control unit, located outside the display region of the liquid crystal display panel and electrically coupled to the sensing unit;

wherein

the sensing unit comprises a first metal conductor and a second metal conductor located in the display region of the liquid crystal display panel, and materials of the first metal conductor and the second metal conductor are different;

the first metal conductor and the second metal conductor are a first metal line and a second metal line located on respective metal structures and respective wirings in the display region of the liquid crystal display panel;

or the first metal conductor and the second metal conductor are the respective metal structures and the respective wirings in the display region of the liquid crystal display panel;

the calculation and control unit comprises an operational amplifier electrically coupled to the sensing unit, and an analog to digital converter electrically coupled to the operational amplifier, and a micro controller unit electrically coupled to the analog to digital converter;

wherein the first metal conductor and the second metal conductor are electrically coupled to an in phase input end and an anti-phase input end of the operational amplifier, respectively;

an output end of the operational amplifier is electrically coupled to an input end of the analog to digital converter;

an output end of the analog to digital converter is electrically coupled to the micro controller unit; and

wherein the calculation and control unit is located on a printed circuit board outside the display region of the liquid crystal display panel.

10. The temperature sensing system integrated in the liquid crystal display panel according to claim 9, wherein connection lines among the first metal conductor, the second metal conductor and the operational amplifier, a connection line between the operational amplifier and the analog to digital converter, and a connection line between the analog to digital converter and the micro controller unit are all copper lines.