Display device

• US 8,669,928 B2
• Filed: 01/25/2013
• Issued: 03/11/2014
• Est. Priority Date: 07/21/1999
• Status: Expired due to Term

• Current Assignee: Semiconductor Laboratory Company Limited
• Original Assignee: Semiconductor Laboratory Company Limited
• Inventors: Yamazaki, Shunpei, Koyama, Jun, Yamagata, Hirokazu
• Primary Examiner(s): Liang, Regina
• Application Number:
  US13/750,290
• Publication Number:
  US 20130134430A1
• Time in Patent Office: 410 Days
• Field of Search: 345 87-100, 345/204, 345/209, 345/210
• US Class Current: 345/87
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: 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
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3666 with the matrix divided into sections
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/127 with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement
• CPC Class Codes: H01L 29/78672 Polycrystalline or microcrystalline silicon transistor

Abstract

Display bright in contrast can be obtained without discrination and flicker in the display device of the direct vision type whose pixel pitches are short to 20 μm or less. A liquid crystal panel is driven through the frame inverse driving method, and the vertical frame frequency is set to 120 Hz or more. Also, each of the pixels is arranged to correspond to one of R, G and B of color filters disposed on a TFT substrate side.

Claims

1. A display device comprising:

a semiconductor layer over a substrate;

a gate insulating film over the semiconductor layer;

a gate electrode, a gate wiring and a capacitor wiring over the gate insulating film;

an interlayer insulating film over the gate electrode, the gate wiring and the capacitor wiring; and

a pixel electrode over the interlayer insulating film,

wherein the pixel electrode is electrically connected to the semiconductor layer,

wherein the capacitor wiring includes a first layer and a second layer over the first layer,

wherein the first layer is formed over and in contact with a same insulating film as the gate insulating film, and the second layer is formed from a same material as the gate wiring,

wherein a storage capacitor is formed from a portion of the semiconductor layer, the insulating film and the capacitor wiring, and

wherein the display device is configured to be driven at a frame frequency of 120 Hz or more.

2. The display device according to claim 1, wherein an impurity element imparting n-type conductivity is added into the portion of the semiconductor layer.

3. The display device according to claim 1, wherein the first layer is wider than the gate electrode.

4. The display device according to claim 1, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

5. A display device comprising:

a semiconductor layer over a substrate;

a gate insulating film over the semiconductor layer;

a gate electrode, a gate wiring and a capacitor wiring over the gate insulating film;

an interlayer insulating film over the gate electrode, the gate wiring and the capacitor wiring; and

a pixel electrode over the interlayer insulating film,

wherein the pixel electrode is electrically connected to the semiconductor layer at a portion between the gate electrode and the capacitor wiring,

wherein the capacitor wiring includes a first layer and a second layer over the first layer,

wherein the first layer is formed over and in contact with a same insulating film as the gate insulating film, and the second layer is formed from a same material as the gate wiring,

wherein a storage capacitor is formed from a portion of the semiconductor layer, the insulating film and the capacitor wiring, and

wherein the display device is configured to be driven at a frame frequency of 120 Hz or more.

6. The display device according to claim 5, wherein an impurity element imparting n-type conductivity is added into the portion of the semiconductor layer.

7. The display device according to claim 5, wherein the first layer is wider than the gate electrode.

8. The display device according to claim 5, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

9. A display device comprising:

a semiconductor layer over a substrate;

a gate insulating film over the semiconductor layer;

a gate electrode, a gate wiring and a capacitor wiring over the gate insulating film;

an interlayer insulating film over the gate electrode, the gate wiring and the capacitor wiring; and

a pixel electrode over the interlayer insulating film,

wherein the pixel electrode is electrically connected to the semiconductor layer,

wherein the capacitor wiring includes a first layer and a second layer over the first layer,

wherein the second layer is narrower than the first layer,

wherein the first layer is formed over and in contact with a same insulating film as the gate insulating film, and the second layer is formed from a same material as the gate wiring,

wherein a storage capacitor is formed from a portion of the semiconductor layer, the insulating film and the capacitor wiring, and

wherein the display device is configured to be driven at a frame frequency of 120 Hz or more.

10. The display device according to claim 9, wherein an impurity element imparting n-type conductivity is added into the portion of the semiconductor layer.

11. The display device according to claim 9, wherein the first layer is wider than the gate electrode.

12. The display device according to claim 9, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.