# US 2013/0278647 A1 · Liquid crystal display apparatus and manufacturing method therefor

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- Number: US 2013/0278647 A1
- Document ID: US20130278647A1
- Status: Published application
- Kind: A1
- Application number: 13/920,547
- Filed: 2013-06-18
- Published: 2013-10-24
- Earliest claimed: 2004-03-25
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Shingo NAGANO; Yuichi Masutani; Hisaharu Oura
- Web page: https://patentgrep.com/patent/US20130278647A1

## CPC

- G09G 3/3611: {Control of matrices with row and column drivers}
- G09G 3/3688: {suitable for active matrices only}
- G09G 3/3696: {Generation of voltages supplied to electrode drivers}
- G09G 3/2011: {by amplitude modulation}
- G09G 3/3614: {Control of polarity reversal in general}
- G09G 2300/0434: Flat panel display in which a field is applied parallel to the display plane
- G09G 2310/0248: Precharge or discharge of column electrodes before or after applying exact column voltages
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2310/06: Details of flat display driving waveforms
- G09G 2320/0209: Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
- 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)

## Abstract

A liquid crystal display apparatus according to the invention is an in-plane switching liquid crystal display apparatus having gate wirings and source wirings, which intersect one another, and also having pixel electrodes each connected to an associated one of the source wirings, and common electrodes disposed opposite to the pixel electrodes. A scanning signal is inputted to the gate wiring so that one horizontal period has a writing period, in which a pixel potential is written to the pixel electrode, and a nonwriting period, in which no pixel potential is written to the pixel electrode. The pixel potential is outputted to the source wiring in the writing period, while a common potential is inputted to the source wiring in the nonwriting period.

## Claims

### Claim 1

A liquid crystal display apparatus comprising:
plural gate wirings formed on a substrate;
source wirings intersecting with the gate wirings through an insulating film;
switching elements connected to the source wirings;
pixel electrodes connected to the source wirings through the switching elements, to which pixel potentials are inputted according to a driving voltage for driving liquid crystals; and
common electrodes, disposed opposite to the pixel electrodes and adapted so that a common potential is inputted thereto,
a voltage supply circuit includes a plurality of resistors connected to the source wiring and is configured to have a plurality of voltage outputs and at least two switched states;
wherein a scanning signal is inputted to the gate wirings so that one horizontal period of the liquid crystal display apparatus has a write time, in which the pixel potential is written to the pixel electrode, and a non-write time in which the pixel potential is not written to the pixel electrode,
wherein the pixel potential is inputted to the source wiring in the write time, and an electric potential being closer to the common potential than the pixel potential is inputted to the source wiring in the non-write time,
wherein in a first switched state during the write time, the voltage supply circuit is configured to generate an analog voltage based on a reference voltage and ratios among the plurality of resistors, the pixel potential being generated based on the analog voltage of the voltage supply circuit, and
wherein the liquid crystal display apparatus is an in-plane switching liquid crystal display apparatus, which drives liquid crystals horizontally to the substrate according to an electric field generated by the pixel potential of the pixel electrode and the common potential of the common electrode.

### Claim 2 (depends on 1)

The liquid crystal display apparatus according to claim 1, wherein an electric potential being substantially equal to the common potential is inputted to the source wiring in the non-write time.

### Claim 3 (depends on 1)

The liquid crystal display apparatus according to claim 1, further comprising: a driving circuit for inputting the pixel potentials to the source wirings according to a gradation voltage;
wherein in a first switched state, the voltage supply circuit supplies a plurality of gradation voltages to the driving circuit according to a supplied reference voltage and resistances of the plurality of resistors, and
wherein each gradation voltage is associated with a respective combination of resistances of the plurality of resistors.

### Claim 4

A driving method for a liquid crystal display apparatus comprising: plural gate wirings formed on a substrate; source wirings intersecting with the gate wirings through an insulating film; switching elements connected to the source wirings; pixel electrodes connected to the source wirings through the switching elements, to which pixel potentials are inputted according to a driving voltage for driving liquid crystals; common electrodes, disposed opposite to the pixel electrodes and adapted so that a common potential is inputted thereto, and a voltage supply circuit that includes a plurality of resistors connected to the source wiring and is configured to have a plurality of voltage outputs and at least two switched states, the method comprising the steps of:
supplying a scanning signal to the gate wirings in such a way as to form a write time, in which a pixel potential is written to the pixel electrode, in one horizontal period;
inputting the pixel potential to the source wirings in the write time;
supplying a scanning signal to the gate wrings so that the one horizontal period has a non-write time in which the pixel potential is not written thereto; and
inputting an electric potential being closer to the common potential than the pixel potential to the source wirings in the non-write time,
wherein in a first switched state during the one horizontal period, supplying the pixel potential supplied to the source wirings is based on an analog voltage generated in the voltage supply circuit using a reference voltage and resistance ratios among the plurality of resistors, and
wherein liquid crystals are driven horizontally to the substrate according to an electric field generated by the pixel potential of the pixel electrode and the common potential of the common electrode.

### Claim 5 (depends on 4)

The driving method for a liquid crystal display apparatus according to claim 4, wherein an electric potential being substantially equal to the common potential is inputted to the source wirings in the non-write time.

### Claim 6

A liquid crystal display apparatus comprising:
plural gate wirings formed on a substrate;
source wirings intersecting with the gate wirings through an insulating film;
switching elements connected to the source wirings;
pixel electrodes connected to the source wirings through the switching elements, to which pixel potentials are inputted according to a driving voltage for driving liquid crystals;
common electrodes, disposed opposite to the pixel electrodes and adapted so that a common potential is inputted thereto; and
a voltage supply circuit having a plurality of resistors connected to the source wiring and is configured to have a plurality of voltage outputs and at least two switched states,
wherein a time period corresponding to one horizontal period of the liquid crystal display apparatus includes a first time including a moment at which a state of the switching element changes from an ON-state to an Off-state and a second time that is present in such a way as to be precedent to the first time,
wherein the pixel potential is inputted to the source wirings in the first time, and wherein an electric potential being closer to the common potential than the pixel potential is inputted to the source wirings in the second time,
wherein in a first switched state at the first time, the voltage supply circuit is configured to generate an analog voltage based on a reference voltage and ratios among the plurality of resistors, the pixel potentials being generated based on the analog voltage of the voltage supply circuit, and
wherein liquid crystals are driven horizontally to the substrate according to an electric field generated by the pixel potential of the pixel electrode and the common potential of the common electrode.

### Claim 7

A driving method for a liquid crystal display apparatus comprising: plural gate wirings formed on a substrate; source wirings intersecting with the gate wirings through an insulating film; switching elements connected to the source wirings; pixel electrodes connected to the source wirings through the switching elements, to which pixel potentials are inputted according to a driving voltage for driving liquid crystals; common electrodes, disposed opposite to the pixel electrodes and adapted so that a common potential is inputted thereto, and a voltage supply circuit that includes a plurality of resistors connected to the source wiring and is configured to have a plurality of voltage outputs and at least two switched states, the method comprising the steps of:
inputting an electric potential being closer to the common potential than the pixel potential to the source wirings in a time period corresponding to one horizontal period of the liquid crystal display apparatus;
supplying the pixel potential until a state of the switching element changes from an ON-state to an OFF-state after the potential being closer to the common potential than the pixel potential is inputted to the source wirings,
wherein in a first switched state of the voltage supply circuit during the one horizontal period, supplying the pixel potentials to the source wirings is based on an analog voltage generated in the voltage supply circuit using a reference voltage and resistance ratios among the plurality of resistors, and
wherein the liquid crystal display apparatus is an in-plane switching liquid crystal display apparatus, which drives liquid crystals horizontally to the substrate according to an electric field generated by the pixel potential of the pixel electrode and the common potential of the common electrode.

### Claim 8 (depends on 1)

The liquid crystal display apparatus according to claim 1, wherein the source wirings, the pixel electrodes, and the common electrodes are connected to a central portion, and wherein the source wirings, the pixel electrodes, and the common electrodes are bent at the central portion.

### Claim 9 (depends on 6)

The liquid crystal display apparatus according to claim 6, wherein the source wirings, the pixel electrodes, and the common electrodes are connected to a central portion, and wherein the source wirings, the pixel electrodes, and the common electrodes are bent at the central portion.

### Claim 10 (depends on 3)

The liquid crystal display apparatus according to claim 3, wherein in a second switched state the voltage supply circuit provides on each of the plurality of outputs an electric potential, which is closer to the common potential than the pixel potential.

### Claim 11 (depends on 3)

The liquid crystal display apparatus according to claim 3, wherein a number of the plurality of voltage outputs available is determined based on a color to be displayed.

### Claim 12 (depends on 1)

A liquid crystal display apparatus according to claim 1,
wherein the voltage supply circuit includes a first switch and a second switch at a reference-voltage side and a ground side to switch into the electric potential closer to the common potential, and
wherein the at least switched states are caused by switching between ON and OFF of the first switch and the second switch.

### Claim 13 (depends on 4)

A driving method according to claim 4,
wherein, in the first switched state, the first switch is conducted to a reference-voltage side and the second switch is conducted to a ground side, and
wherein, in a second switched state, both of the first switch and the second switch are conducted to the electric potential closer to the common potential.