Liquid crystal display unit

Patent metadata

Field	Value
Publication number	US-9482891-B2
Application number	US-201514669046-A
Country	US
Kind code	B2
Filing date	Mar 26, 2015
Priority date	Mar 28, 2014
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A liquid crystal display unit includes: an insulating substrate; a counter insulating substrate; a liquid crystal put between the insulating substrate and the counter insulating substrate; a pixel matrix including plural pixels; and a peripheral circuit including a control section and an output section, for driving a gate line of a pixel TFT in each of the pixels. The pixel matrix and the peripheral circuit are integrally formed above the insulating substrate such that the output section is located closer to the pixel matrix than the control section. The liquid crystal display unit further comprises a light shielding metal disposed at an insulating-substrate side of the pixel TFT in each pixel, and a light shielding metal disposed at an insulating-substrate side of each TFT at least in the output section among TFTs in the peripheral circuit.

First claim

The invention claimed is:

1. A liquid crystal display unit comprising:
an insulating substrate;
a counter insulating substrate facing the insulating substrate;
a liquid crystal put between the insulating substrate and the counter insulating substrate;
a pixel matrix including a plurality of pixels each including a pixel capacitor and a pixel TFT; and
a peripheral circuit including a control section and an output section, for driving a gate line of the pixel TFT in each of the pixels, each of the control section and the output section including TFTs,
wherein the pixel matrix and the peripheral circuit are integrally formed in one body and formed on the insulating substrate,
the output section is located closer to the pixel matrix than the control section when being viewed from a normal direction of the insulating substrate,
the pixel TFTs of the pixels and the TFTs in the peripheral circuit have a top-gate structure, and
the liquid crystal display unit further comprises a light shielding metal disposed at an insulating-substrate side of the pixel TFT in each of the pixels, and a light shielding metal disposed at an insulating-substrate side of each of the TFTs at least in the output section among the TFTs in the peripheral circuit.

2. The liquid crystal display unit of claim 1 ,
wherein the control section includes a TFT at the insulating-substrate side of which a light shielding metal is not disposed.

3. The liquid crystal display unit of claim 1 ,
wherein the TFTs in the peripheral circuit are TFTs of a same conductivity type,
the TFTs in the output section includes a first TFT whose gate voltage is to be stepped up or stepped down by a bootstrap method, and
the light shielding metal formed on the insulating-substrate side of the first TFT has a same electric potential as an electric potential of an output terminal of the output section.

4. The liquid crystal display unit of claim 3 ,
the TFTs in the peripheral circuit includes a second TFT at the insulating-substrate side of which a light shielding metal is disposed, the second TFT being different from the first TFT, and
the light shielding metal disposed at the insulating-substrate side of the second TFT has a same electric potential as that of a source electrode of the second TFT.

5. The liquid crystal display unit of claim 1 ,
wherein the light shielding metal disposed at the insulating-substrate side of the pixel TFT in each of the pixels, hides a semiconductor layer of the corresponding pixel TFT, when being viewed from the normal direction of the insulating substrate, and
the light shielding metal disposed at the insulating-substrate side of each of the TFTs in at least the output section among the TFTs in the peripheral circuit, hides a semiconductor layer of the corresponding TFT, when being viewed from the normal direction of the insulating substrate.

6. The liquid crystal display unit of claim 1 , further comprising a package member made of a material which does not transmit light,
wherein the package member covers the insulating substrate and the counter insulating substrate, and includes an opening section formed thereon, and
an edge surface of the opening section overlaps with the output section when being viewed from the normal direction of the insulating substrate.

7. The liquid crystal display unit of claim 6 ,
wherein the edge surface of the opening section is located in a middle of a pixel-matrix-side edge of the control section and a peripheral-circuit-side edge of the pixel matrix when being viewed from a normal direction of the insulating substrate.

Assignees

• Nlt Technologies Ltd

Inventors

• Sekine Hiroyuki

Classifications

• G02F1/13306 Primary

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F1/133512 Primary

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G02F1/133345

  Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence) · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title