Liquid crystal display and method of driving liquid crystal display

• US 10,643,564 B2
• Filed: 08/30/2019
• Issued: 05/05/2020
• Est. Priority Date: 12/05/2016
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Kawabuchi, Shinji, Tanahara, Manabu
• Primary Examiner(s): Taylor, Jr., Duane N
• Application Number:
  US16/557,767
• Publication Number:
  US 20190385559A1
• Time in Patent Office: 249 Days
• Field of Search: None
• CPC Class Codes: G02F 1/136254 Checking; Testing
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2310/0245 Clearing or presetting the whole screen independently of waveforms, e.g. on power-on G09G2310/063 takes precedence
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2310/0278 Details of driving circuits arranged to drive both scan and data electrodes
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/027 Arrangements or methods related to powering off a display
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A liquid crystal display includes scanning lines and signal lines arranged in a matrix pattern on a TFT substrate, a pixel being formed at a crossing portion of each scanning line and each signal line, and including a TFT that is connected to each scanning line and each signal line, first nonlinear resistance elements formed respectively in the scanning lines, each of which being connected to one scanning line at one end thereof and to a short ring power-supply line for a scanning line at another end thereof, and second nonlinear resistance elements formed respectively in the signal lines, each of which being connected to one signal line at one end thereof and to a short ring power-supply line for a signal line at another end thereof. A voltage is applied to the first and second nonlinear resistance elements independently of each scanning line and each signal line.

Claims

1. A liquid crystal display, comprising:

a plurality of scanning lines and a plurality of signal lines arranged in a matrix pattern on a substrate;

a pixel being formed at a crossing portion of each of the plurality of scanning lines and each of the plurality of signal lines, and comprising a thin film transistor that is connected to each of the plurality of scanning lines and each of the plurality of signal lines;

a short ring line connected to each of the plurality of scanning lines and each of the plurality of signal lines;

inspection thin film transistors on a scanning line side that are formed respectively in the plurality of scanning lines;

an inspection scanning line arranged so as to be connected to each of the plurality of scanning lines through intermediation of each of the inspection thin film transistors on a scanning line side;

inspection thin film transistors on a signal line side that are formed respectively in the plurality of signal lines;

an inspection signal line arranged so as to be connected to each of the plurality of signal lines through intermediation of each of the inspection thin film transistors on a signal line side;

an inspection thin film transistor switching line on a scanning line side arranged so as to be connected to the inspection thin film transistors on a scanning line side; and

an inspection thin film transistor switching line on a signal line side arranged so as to be connected to the inspection thin film transistors on a signal line side, wherein

the inspection thin film transistor switching line on a scanning line side is configured to receive a voltage to turn on the inspection thin film transistors on a scanning line side,

when the inspection thin film transistors on a scanning line side are in an on state, the inspection scanning line is configured to receive a voltage to turn on all of the scanning lines,

the inspection thin film transistor switching line on a signal line side is configured to receive a voltage to turn on the inspection thin film transistors on a signal line side, and

when the inspection thin film transistors on a signal line side are in an on state, the inspection signal line is configured to receive a ground voltage.

2. The liquid crystal display according to claim 1, further comprising:

a plurality of first nonlinear resistance elements formed respectively in the plurality of scanning lines, each of the plurality of first nonlinear resistance elements being connected to one of the plurality of scanning lines at one end thereof and being connected to the short ring line at another end thereof; and

a plurality of second nonlinear resistance elements formed respectively in the plurality of signal lines, each of the plurality of second nonlinear resistance elements being connected to one of the plurality of signal lines at one end thereof and being connected to the short ring line at another end thereof.

3. The liquid crystal display according to claim 1, further comprising a scanning-line driving circuit for applying a voltage to each of the plurality of scanning lines,

wherein the scanning-line driving circuit is provided separately from the substrate.

4. The liquid crystal display according to claim 1, further comprising a scanning-line driving circuit for applying a voltage to each of the plurality of scanning lines,

wherein the scanning-line driving circuit is provided on the substrate.

5. The liquid crystal display according to claim 1, further comprising a signal-line driving circuit for applying a voltage to each of the plurality of signal lines,

wherein the signal-line driving circuit is provided separately from the substrate.

6. The liquid crystal display according to claim 1, further comprising a signal-line driving circuit for applying a voltage to each of the plurality of signal lines,

wherein the signal-line driving circuit is provided on the substrate.

7. The liquid crystal display according to claim 1, wherein an active layer of the thin film transistor comprises silicon as a main component thereof.

8. The liquid crystal display according to claim 1, wherein an active layer of the thin film transistor comprises an oxide semiconductor.