LIQUID CRYSTAL TEMPERATURE SENSOR, TEMPERATURE DETECTING METHOD BY LIQUID CRYSTAL TEMPERATURE SENSOR, LIQUID CRYSTAL DEVICE AND LIQUID CRYSTAL DEVICE DRIVE METHOD

• US 20110069092A1
• Filed: 04/06/2009
• Published: 03/24/2011
• Est. Priority Date: 06/11/2008
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Furukawa, Tomoo, Fujioka, Kazuyoshi
• Application Number:
  US12/736,858
• Publication Number:
  US 20110069092A1
• Time in Patent Office: Days
• US Class Current: 345/690
• 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

Abstract

Provided is a liquid crystal temperature sensor including: a liquid crystal panel including a first substrate, a second substrate, and a liquid crystal layer; and a control section for controlling driving of the liquid crystal panel, the first substrate including (i) a plurality of signal lines intersecting with each other and (ii) switching elements correspondingly provided to intersections of the plurality of signal lines, the liquid crystal panel including a plurality of picture elements arranged in a matrix. In at least one embodiment, the control section includes a current-to-temperature information converting section for (i) detecting an amount of current flowing into at least one of the picture elements and (ii) converting the amount of current detected, into temperature information of part of the liquid crystal layer which part corresponds to the at least one of the picture elements.

Claims

1. A liquid crystal temperature sensor comprising:

a liquid crystal panel including a first substrate, a second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate; and

a control section for controlling driving of the liquid crystal panel,

the liquid crystal panel including a plurality of picture elements arranged in a matrix,

the control section including a current-to-temperature information converting section for (i) detecting an amount of current flowing into at least one of the picture elements and (ii) converting the amount of current detected, into temperature information of part of the liquid crystal layer which part corresponds to said at least one of the picture elements.

2. The liquid crystal temperature sensor as set forth in claim 1, wherein:

the current-to-temperature information converting section stores information regarding a correlation between the amount of current and the temperature information; and

based on the information regarding the correlation, the current-to-temperature information converting section converts the amount of current detected, into the temperature information.

3. The liquid crystal temperature sensor as set forth in claim 1, wherein:

the first substrate includes (i) a plurality of signal lines intersecting with each other and (ii) switching elements correspondingly provided to intersections of the plurality of signal lines;

the plurality of signal lines include source bus lines and gate bus lines wherein the source bus lines and the gate bus lines intersect with each other at the intersections so as to be connected with the respective switching elements correspondingly;

the switching elements are transistor elements;

the control section includes (i) a source driver for controlling the source bus lines and (ii) a gate driver for controlling the gate bus lines; and

the current-to-temperature information converting section detects a consumption current of the source driver so as to detect the amount of current flowing into said at least one of the picture elements.

4. The liquid crystal temperature sensor as set forth in claim 1, wherein:

the liquid crystal panel includes (i) a display region, which displays an image, and (ii) a non-display region, which does not display the image, the non-display region being provided along an outer edge of the display region; and

each of said at least one of the picture elements for which the amount of current is detected is a picture element belonging to the non-display region.

5. The liquid crystal temperature sensor as set forth in claim 3, wherein:

the liquid crystal panel includes (i) a display region, which displays an image, and (ii) a non-display region, which does not display the image, the non-display region being provided along an outer edge of the display region; and

among the picture elements, a picture element belonging to the non-display region includes, among the switching elements, a switching element connected with a corresponding dummy gate bus line, which is, among the gate bus lines, a gate bus line provided for inspection of the liquid crystal panel.

6. The liquid crystal temperature sensor as set forth in claim 4, wherein:

the second substrate includes a black matrix; and

the non-display region is covered with the black matrix when seen in a plane view.

7. The liquid crystal temperature sensor as set forth in claim 1, wherein:

the first substrate includes the plurality of signal lines intersecting with each other; and

each of the picture elements is demarcated by corresponding ones of the plurality of signal lines intersecting with each other.

8. A liquid crystal device comprising:

a liquid crystal temperature sensor as set forth in claim 1, the liquid crystal temperature sensor including the liquid crystal panel which is driven by overshoot driving according to input tone data having been subjected to tone conversion with reference to a tone conversion table,

the control section including;

a storing section for storing a plurality of tone conversion tables in which respective different degrees of tone change are set for tone conversion;

a selecting section for selecting, among the plurality of tone conversion tables, a tone conversion table to be referred to; and

a tone converting section for carrying out tone conversion on the input tone data by referring to the tone conversion table selected,

the selecting section selecting, among the plurality of tone conversion tables stored in the storing section, the tone conversion table which is suitable for a temperature of the liquid crystal layer, based on the temperature information supplied by the current-to-temperature information converting section.

9. A method for detecting a temperature of a liquid crystal layer in a liquid crystal temperature sensor, wherein the liquid crystal temperature sensor includes:

a liquid crystal panel including a first substrate, a second substrate, and the liquid crystal layer sandwiched between the first substrate and the second substrate; and

a control section for controlling driving of the liquid crystal panel,

the liquid crystal panel including a plurality of picture elements arranged in a matrix,

said method comprising the steps of;

detecting an amount of current flowing into at least one of the picture elements; and

converting the amount of current detected, into temperature information.

10. The method as set forth in claim 9, wherein:

the first substrate includes (i) a plurality of signal lines intersecting with each other and (ii) switching elements correspondingly provided to intersections of the plurality of signal lines;

each of the picture elements is demarcated by corresponding ones of the plurality of signal lines intersecting with each other.

11. A method for driving a liquid crystal device, wherein the liquid crystal device includes:

a liquid crystal panel including a first substrate, a second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate; and

a control section for controlling driving of the liquid crystal panel,

the liquid crystal panel including a plurality of picture elements arranged in a matrix,

the control section includes;

a current-to-temperature information converting section for (i) detecting an amount of current flowing into at least one of the picture elements and (ii) converting the amount of current detected, into temperature information of part of the liquid crystal layer which part corresponds to said at least one of the picture elements;

a storing section for storing a plurality of tone conversion tables in which respective different degrees of tone change are set for tone conversion;

a selecting section for selecting, among the plurality of tone conversion tables, a tone conversion table to be referred to; and

a tone converting section for carrying out tone conversion on input tone data by referring to the tone conversion table selected,

said method comprising the steps of;

the current-to-temperature information converting section detecting an amount of current flowing into said at least one of the picture elements;

the current-to-temperature information converting section converting the amount of current detected, into temperature information;

based on the temperature information, the selecting section selecting, among the plurality of tone conversion tables stored in the storing section, a tone conversion table which is suitable for a temperature of the liquid crystal layer;

the converting section carrying out tone conversion on input tone data by referring to the tone conversion table selected; and

based on the input tone data on which the tone conversion has been carried out, driving the liquid crystal panel by overshoot driving.

12. The method as set forth in claim 11, wherein:

the first substrate includes (i) a plurality of signal lines intersecting with each other and (ii) switching elements correspondingly provided to intersections of the plurality of signal lines;

each of the picture elements is demarcated by corresponding ones of the plurality of signal lines intersecting with each other.