# US 9,039,276 B2 · Temperature detecting device, electro-optic device and electronic apparatus

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- Number: US 9,039,276 B2
- Document ID: US9039276B2
- Status: Granted
- Kind: B2
- Application number: 13/344,411
- Filed: 2012-01-05
- Published: 2012-07-19
- Granted: 2015-05-26
- Earliest claimed: 2011-01-13
- Assignees: Seiko Epson Corporation
- Applicants: Shinsuke Fujikawa
- Inventors: Shinsuke Fujikawa
- Web page: https://patentgrep.com/patent/US9039276B2

## CPC

- G01K 13/00: Thermometers specially adapted for specific purposes
- G01K 7/16: using resistive elements
- G09G 3/002: {to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT}
- G09G 3/3611: {Control of matrices with row and column drivers}
- G09G 3/3614: {Control of polarity reversal in general}
- H04N 9/3144: {Cooling systems (cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16)}
- H04N 9/3155: {for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406)}
- H04N 9/3194: {including sensor feedback}
- G09G 2320/0204: Compensation of DC component across the pixels in flat panels
- G09G 2320/041: Temperature compensation
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A control unit sets a time interval for measuring a temperature of a liquid crystal panel as a first time interval (1 second), and thereafter measures the temperature of the liquid crystal panel each time the first time interval elapses. When the temperature of the liquid crystal panel is stabilized, the control unit sets a time interval for measuring the temperature of the liquid crystal panel as a second time interval (5 seconds). The control unit measures the temperature of the liquid crystal panel each time the second time interval elapses. Moreover, if an operation to change the amount of light reaching the liquid crystal panel is performed, the control unit restores the time interval for measuring the temperature of the liquid crystal panel to the first time interval.

## Claims

### Claim 1

An electro-optic device comprising:
a temperature sensor that includes a plurality of dummy pixel electrodes electrically interconnected to each other on an outside of a display region for displaying an image;
a measurement unit that measures a temperature by applying, at a set time interval, a signal for actuating the temperature sensor to the temperature sensor through a wiring;
a first setting unit that sets the set time interval as a second time interval which is longer than a first time interval, if a difference between a latest temperature measured by the measurement unit and a previous temperature measured by the measurement unit at a time period preceding the latest temperature is less than a first predetermined threshold value as determined by a control unit, when the measurement unit measures the temperature at the first time interval; and
a second setting unit that sets the set time interval as the first time interval, if an amount of incident light from a light source is changed when the measurement unit measures the temperature at the second time interval.

### Claim 2 (depends on 1)

The electro-optic device according claim 1, further comprising:
a third setting unit that sets the set time interval as a third time interval that is longer than the second time interval, if a difference between a last measured temperature measured by the measurement unit and a temperature measured before the last measured temperature measured by the measurement unit is less than a second threshold value which is smaller than the first threshold value as determined by the control unit, when the measurement unit measures a temperature at the second time interval.

### Claim 3 (depends on 1)

An electronic apparatus comprising an electro-optic device according to claim 1.

### Claim 4 (depends on 2)

An electronic apparatus comprising an electro-optic device according to claim 2.