Thin film transistor array having single light shield layer over transistors and gate and drain lines
First Claim
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1. A thin film transistor array, comprising:
- a single substrate;
a plurality of thin film transistors formed on said single substrate, each thin film transistor having at least a gate electrode, a semiconductor layer having a channel portion and a source electrode and a drain electrode;
a plurality of gate lines and a plurality of drain lanes provided over said single substrate in an intersecting relation via an insulating film, said gate lines and drain lines being connected to gate and rain electrodes of the transistors at locations near the respective intersections of the gate and rain lines;
a plurality of transparent electrodes electrically connected to the source electrodes and providing a matrix array arranged in a plurality of regions surrounded with the gate and drain lines, respectively;
a transparent insulating film formed at least on said thin film transistor, said gate lines and said drain lines, said transparent insulating film having a first surface which is in contact at least with said thin film transistors and said gate and drain lines, and a second surface which is an opposite surface opposing said first surface; and
a single light shield film formed on said second surface of said transparent insulating film, said single light shield film being over said single substrate so as to cover the channel portions of said transistors, said gate lines, and said drain lines, and said single light shield film having a width which is not less than an interval between adjacent peripheral edges of said plurality of transparent electrodes, so as to overlap the edges of said plurality of transparent electrodes, to thereby shield said plurality of transparent electrodes, to thereby shield said channel portions from light and to shut of light leaking from among a plurality of transparent electrodes.
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Abstract
A TFT array has a plurality of gate lines and a plurality of drain lines formed on a transparent insulating substrate. The gate lines intersect with the drain lines. TFTs are formed at the intersections of the gate lines and the drain lines. An opaque film is formed above the gate lines, the drain lines, and the TFTs, allowing no passage of light passing through the gaps between the transparent electrode, on the one hand, and the gate and drain lines, on the other hand. Therefore, when the TFT array is incorporated into a liquid-crystal display, the display will display high-contrast images.
330 Citations
8 Claims
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1. A thin film transistor array, comprising:
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a single substrate; a plurality of thin film transistors formed on said single substrate, each thin film transistor having at least a gate electrode, a semiconductor layer having a channel portion and a source electrode and a drain electrode; a plurality of gate lines and a plurality of drain lanes provided over said single substrate in an intersecting relation via an insulating film, said gate lines and drain lines being connected to gate and rain electrodes of the transistors at locations near the respective intersections of the gate and rain lines; a plurality of transparent electrodes electrically connected to the source electrodes and providing a matrix array arranged in a plurality of regions surrounded with the gate and drain lines, respectively; a transparent insulating film formed at least on said thin film transistor, said gate lines and said drain lines, said transparent insulating film having a first surface which is in contact at least with said thin film transistors and said gate and drain lines, and a second surface which is an opposite surface opposing said first surface; and a single light shield film formed on said second surface of said transparent insulating film, said single light shield film being over said single substrate so as to cover the channel portions of said transistors, said gate lines, and said drain lines, and said single light shield film having a width which is not less than an interval between adjacent peripheral edges of said plurality of transparent electrodes, so as to overlap the edges of said plurality of transparent electrodes, to thereby shield said plurality of transparent electrodes, to thereby shield said channel portions from light and to shut of light leaking from among a plurality of transparent electrodes. - View Dependent Claims (2, 3, 7)
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4. A liquid crystal device, comprising:
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a single first substrate; a plurality of thin film transistors formed on said single first substrate, each thin film transistor having at least a gate electrode, a semiconductor layer having a channel portion, a source electrode nd a drain electrode; a plurality of gate lines and a plurality of drain lines provided over said single first substrate in an intersecting relation via an insulating layer, said gate lines and drain lines being connected of gate and drain electrodes of the transistors a locations near the respective intersections of the gate and drain lines; a plurality of transparent electrodes electrically connected to the source electrodes and providing a matrix array arranged in a plurality of regions surrounded with the gate and drain lines, respectively; a transparent insulating film formed at least one said thin film transistors, said gate lines nd said drain lines, said transparent insulating film having a first surface which is in contact at least with said thin film transistors and said gate and rain lines, and a second surface which is an opposite surface opposing said first surface; and a single light shield film formed on said second surface of said transparent insulating film, said single light shield film being provided over said single first substrate so as to cover the channel portions of said transistors, said gate lines, and said drain lines, and said single light shield film having a width which is not less than an interval between adjacent peripheral edges of said plurality of transparent electrodes so as to overlap the edges of said plurality of transparent electrodes, to thereby shield said channel portion from light and to shut off light leaking from among a plurality of transparent electrodes; a second substrate having an opposite electrode arranged opposite to said plurality of transparent electrodes, said second substrate being joined to said single first substrate by a sealing material with a predetermined space between said single first substrate and said second substrate; and a liquid crystal material sealed in said predetermined space in an area surrounded by said single first substrate, said second substrate nd said sealing material. - View Dependent Claims (8)
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5. A thin film transistor array, comprising:
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a single substrate; a plurality of thin film transistors formed on said single substrate, each thin film transistor having at least a gate electrode, a semiconductor layer having a channel portion and a source electrode, and a drain electrode; a plurality of gate lines and a plurality of drain lines provided over said single substrate in an intersecting relation via and insulating film, said gate lines and drain lines being connected to gate and drain electrodes of the transistors at locations near the respective intersections of the gate and drain lines; a plurality of transparent electrodes electrically connected to the source electrodes and providing a matrix array arranged in a plurality of regions surrounded with the gate and drain lines, respectively; a transparent insulting film formed at least on said thin film transistor, said gate lines and said drain lines, said transparent insulating film having a first surface which is in contact at least with said thin film transistors and said gate and drain lines, and a second surface which is an opposite surface opposing said first surface; and a single light shield film formed on said second surface of said transparent insulating film, said single light shield film being over said single substrate so as to cover the channel portions of said transistors, said gate lines, and said drain lines, and said single light shield film having a width which is substantially equal to an interval between adjacent peripheral edges of said plurality of transparent electrodes, so as to overlap the edges of said plurality of transparent electrodes, of thereby shield said channel portions from light and to shut off light leaking from among a plurality of transparent electrodes.
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6. A liquid crystal device, comprising:
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a single first substrate; a plurality of thin film transistors formed on said single substrate, each thin film transistor having at least a gate electrode, a semiconductor layer having a channel portion and a source electrode, and a drain electrode; a plurality of gate lines and a plurality of drain lines provided over said single first substrate in an intersecting relation via and insulating layer, said gate lines and drain lines being connected to gate and rain electrodes of the transistors at locations near the respective intersections of the gate and drain lines; a plurality of transparent electrodes electrically connected to the source electrodes and providing a matrix array arranged in a plurality of regions surrounded with the gate and drain lines, respectively; a transparent insulating film formed at least one said thin film transistor, said gate lines and said rain lines, said transparent insulating film having a first surface which is in contact at least with said thin film transistors and said gate and drain lines, and a second surface which is an opposite surface opposing said first surface; and a single light shield film formed on said second surface of said transparent insulating film, said single light shield film being over said single first substrate so as to cover the channel portions of said transistors, said gate lines, and said drain lines, and said single light shield film having a width which is substantially equal to an interval between adjacent peripheral edges of said plurality of transparent electrodes, so as to overlap the edges of said plurality of transparent electrodes, to thereby shield said channel portions from light and to shut off light leaking from among a plurality of transparent electrodes; a second substrate having an opposite electrode arranged opposite to said plurality of transparent electrodes, said second substrate being joined to said single first substrate by a sealing material with a predetermined space between said single first substrate and said second substrate; and a liquid crystal material sealed in said predetermine space in an area surrounded by said single first substrate, said second substrate and said sealing material.
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Specification