LIQUID CRYSTAL DEVICE, TEMPERATURE DETECTION METHOD, AND ELECTRONIC APPARATUS

• US 20100214271A1
• Filed: 02/23/2010
• Published: 08/26/2010
• Est. Priority Date: 02/25/2009
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: MIZUSAKO, Kazuhisa, TOYOOKA, Takashi
• Application Number:
  US12/710,672
• Publication Number:
  US 20100214271A1
• Time in Patent Office: Days
• US Class Current: 345/204
• 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 device including a pair of substrates that are provided opposite to each other with a liquid crystal layer being disposed therebetween, a pair of electrodes provided for each intersection of a plurality of scanning lines and a plurality of data lines, the pair of electrodes driving the liquid crystal layer, a driving circuit that applies a driving voltage to the pair of electrodes, an electric current detection element that detects a value corresponding to an electric current that flows in the liquid crystal layer when the driving voltage is applied, and a temperature information output circuit that outputs temperature information of the liquid crystal layer based on the value corresponding to the electric current.

Claims

1. A liquid crystal device comprising:

a pair of substrates that are provided opposite to each other with a liquid crystal layer being disposed therebetween;

a pair of electrodes provided for each intersection of a plurality of scanning lines and a plurality of data lines, the pair of electrodes driving the liquid crystal layer;

a driving circuit that applies a driving voltage to the pair of electrodes;

an electric current detection element that detects a value corresponding to an electric current that flows in the liquid crystal layer when the driving voltage is applied; and

a temperature information output circuit that outputs temperature information of the liquid crystal layer based on the value corresponding to the electric current.

2. The liquid crystal device according to claim 1, wherein the temperature information output circuit has a table in which a relationship between a value corresponding to an electric current and temperature is pre-stored, and wherein the temperature information output circuit looks up the table to convert the value corresponding to the electric current into the temperature information of the liquid crystal layer.

3. A temperature detection method that is used by the liquid crystal device of claim 1, the temperature detection method comprising:

applying the first voltage to the first electrode through the electric supply line;

applying the second voltage to the second electrode through the data line; and

converting a saturation value for the value corresponding to the electric current that flows in the liquid crystal layer, which is detected by the electric current detection element upon the application of the first voltage and the second voltage, into the temperature information of the liquid crystal layer.

4. An electronic apparatus that is provided with the liquid crystal device according to claim 1.

5. A liquid crystal device comprising:

a first substrate and a second substrate that are provided opposite to each other with a liquid crystal layer being disposed therebetween;

a first electrode and a second electrode provided for each intersection of a plurality of scanning lines and a plurality of data lines, the first electrode and the second electrode driving the liquid crystal layer;

a first supply circuit that supplies a first voltage to the first electrode through an electric supply line;

a second supply circuit that supplies a second voltage to the second electrode through at least one of the plurality of data lines, the second voltage being different from the first voltage;

an electric current detection element that includes a resistance element that is inserted on the electric supply line, the electric current detection element detecting a value corresponding to an electric current that flows in the liquid crystal layer when the first voltage and the second voltage are applied; and

a temperature information output circuit that outputs temperature information of the liquid crystal layer based on the value corresponding to the electric current.

6. The liquid crystal device according to claim 5, wherein the temperature information output circuit converts a saturation value for the value corresponding to the electric current when the first voltage is applied to the first electrode through the electric supply line and the electric current when the second voltage is applied to the second electrode through the data line, which are each detected by the electric current detection element, into the temperature information of the liquid crystal layer.

7. The liquid crystal device according to claim 5, wherein the temperature information output circuit converts a peak value of a second peak that appears in a detected waveform for the value corresponding to the electric current when the first voltage is applied to the first electrode through the electric supply line and the electronic current when the second voltage is applied to the second electrode through the data line, which are each detected by the electric current detection element, into the temperature information of the liquid crystal layer.

8. The liquid crystal device according to claim 5, wherein the temperature information output circuit converts, the time from the application of the first voltage to the first electrode through the electric supply line and the application of the second voltage to the second electrode through the data line to the appearance of a second peak in a waveform of the electric current as the value corresponding to the electric current detected by the electric current detection element into the temperature information of the liquid crystal layer.

9. The liquid crystal device according to claim 5, wherein the electric current detection element includes a low pass filter that filters a voltage that is generated between one terminal of the resistance element and the other terminal of the resistance element and a scanning line driving circuit that sequentially selects the plurality of scanning lines, and wherein the temperature information output circuit outputs the temperature information of the liquid crystal layer based on an output voltage of the low pass filter.

10. A temperature detection method that is used by the liquid crystal device of claim 5, the temperature detection method comprising:

applying the first voltage to the first electrode through the electric supply line;

applying the second voltage to the second electrode through the data line; and

converting a peak value of a second peak that appears in a detected waveform for the value corresponding to the electric current that flows in the liquid crystal layer, which is detected by the electric current detection element upon the application of the first voltage and the second voltage, into the temperature information of the liquid crystal layer.