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US 6,556,265 B1Granted
LCD having auxiliary capacitance lines and light shielding films electrically connected via contact holes
AssigneeSeiko Epson Corporation
InventorMasao Murade
Life of this patent
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Abstract
With a liquid crystal device of a type wherein light-shielding films are provided below TFTs, in order to enable high-quality image display with a relatively simple configuration using the light-shielding film and capacitance lines, the liquid crystal device may consist of a liquid crystal layer held between a pair of substrates, and pixel electrodes provided in a matrix on a TFT array substrate. A plurality of light-shielding films formed of metal with a high melting point and divided into strips are formed below the pixel TFTs, scanning lines, capacitance lines, and so forth, and the capacitance lines and light-shielding films are electrically connected via contact holes. The resistance of the capacitance lines is lowered by the light-shielding films.
Claims30
A liquid crystal device, comprising:
- a pair of substrates including a first substrate and a second substrate;
- a plurality of pixel electrodes arrayed in a matrix on said second substrate;
- a liquid crystal held between said pair of substrates;
- a plurality of thin film transistors, each transistor connected to in correspondence with said pixel electrodes;
- a plurality of data lines and plurality of scanning lines;
- a plurality of capacitance lines arrayed along with said plurality of scanning lines, each capacitance line extending in a direction intersecting with said plurality of data lines and providing a storage capacitor to said plurality of pixel electrodes;
- a plurality of light-shielding films, each light-shielding film extending in a direction intersecting with said plurality of data lines, and being provided at positions covering at least a channel area of said plurality of thin film transistors when viewed from a second substrate side and at least partially facing said plurality of capacitance lines, each light-shielding film being electrically connected to said plurality of capacitance lines for every pixel or plurality of pixels in a direction intersecting to said plurality of data lines;
- and
- a first inter-layer insulating film provided between said capacitance lines and said plurality of light-shielding films, wherein
- said plurality of capacitance lines and said plurality of light-shielding films are each electrically connected via contact holes opened in said first-interlayer insulating film at positions overlapping said data lines on a plane.
7 more elements
A liquid crystal device, comprising:
- a pair of substrates including a first substrate and a second substrate;
- a plurality of pixel electrodes arrayed in a matrix on said second substrate;
- a liquid crystal held between said pair of substrates;
- a plurality of thin film transistors, each transistor connected to said plurality of pixel electrodes;
- a plurality of data lines and plurality of scanning lines mutually intersecting;
- a plurality of capacitance lines arrayed along with said plurality of scanning lines, each capacitance line extending in a direction intersecting with said plurality of data lines and providing a storage capacitor to said plurality of pixel electrodes;
- a plurality of light-shielding films, each light-shielding film extending in a direction intersecting with said plurality of data lines, and provided at positions covering at least a channel area of said-plurality of thin film transistors when viewed from a second substrate side and at least partially facing said plurality of scanning lines, each light-shielding film being electrically connected to said plurality of capacitance lines for every pixel or plurality of pixels in a direction intersecting to said plurality of data lines;
- and
- a first inter-layer insulating film provided between said plurality of capacitance lines and said plurality of light-shielding films, wherein
- said plurality of capacitance lines and said plurality of light-shielding films are each electrically connected via contact holes opened in said first-interlayer insulating film at positions overlapping said plurality of data lines on a plane.
7 more elements
A liquid crystal device, comprising:
- a pair of substrates including a first substrate and a second substrate;
- a plurality of pixel electrodes arrayed in a matrix on said second substrate;
- a liquid crystal held between said pair of substrates;
- a plurality of thin film transistors, each transistor connected to said plurality of pixel electrodes;
- a plurality of data lines and plurality of scanning lines;
- a plurality of capacitance lines arrayed along with said plurality of scanning lines, each capacitance line extending in a direction intersecting with said plurality of data lines and providing a storage capacitor to said plurality of pixel electrodes;
- a plurality of light-shielding films, each light-shielding film extending in a direction intersecting with said plurality of data lines, and being provided at positions covering at least a channel area of said plurality of thin film transistors when viewed from a second substrate side and at least partially facing said plurality of capacitance lines, wherein the light-shielding films are electrically connected to said capacitance lines of neighboring tiers.
4 more elements
A liquid crystal device, comprising:
- a pair of substrates including a first substrate and a second substrate;
- a plurality of pixel electrodes arrayed in a matrix on said second substrate;
- a liquid crystal held between said pair of substrates;
- a plurality of thin film transistors, each transistor connected to said plurality of pixel electrodes;
- a plurality of data lines and plurality of scanning lines;
- a plurality of capacitance lines arrayed along with said plurality of scanning lines, each capacitance line extending in a direction intersecting with said plurality of data lines and providing a storage capacitor to said plurality of pixel electrodes;
- a plurality of light-shielding films, each light-shielding film extending in a direction intersecting with said plurality of data lines, and being provided at positions covering at least a channel area of said plurality of thin film transistors when viewed from a second substrate side and at least partially facing said plurality of capacitance lines, each light-shielding film being electrically connected to said plurality of capacitance lines for every pixel or plurality of pixels in a direction intersecting to said plurality of data lines;
- and
- a first inter-layer insulating film provided between said plurality of light-shielding films and said thin-film transistors
- a second inter-layer insulating film provided above said scanning lines and below said data lines, and
- a third inter-layer insulating film provided above said data lines and below said pixel electrodes, a side of said third inter-layer insulating film which faces said liquid crystal being flattened by at least one of said first inter-layer insulating film, said second inter-layer insulating film, and said third inter-layer insulating film recessed at least portions facing said data lines.
8 more elements
A projection-type display apparatus comprising a light source, a liquid crystal light valve that modulates incident light cast from said light source according to image information, and a projecting device that projects the light modulated by said liquid crystal light valve,
- said liquid crystal light valve having a liquid crystal device in which a liquid crystal is held between a first substrate positioned on a light incident side and a second substrate positioned on a light outgoing side, a first polarizing element positioned at an outward side of said first substrate, and a second polarizing element positioned at an outward side of said second substrate, said projection-type display apparatus further comprising upon said second substrate:
- a plurality of pixel electrodes arrayed in a matrix;
- a plurality of thin film transistors, each transistor connected to said plurality of pixel electrodes;
- a plurality of data lines and plurality of scanning lines mutually intersecting;
- a plurality of capacitance lines arrayed along with said plurality of scanning lines, each capacitance line extending in a direction intersecting with said plurality of data lines and providing a storage capacitor to said plurality of pixel electrodes;
- a plurality of light-shielding films, each light-shielding film extending in a direction intersecting with said plurality of data lines, and provided at positions covering at least a channel area of said plurality of thin film transistors when viewed from a second substrate side and at least partially facing said plurality of capacitance lines, each light-shielding film being electrically connected to said plurality of capacitance lines for every pixel or plurality of pixels in a direction intersecting with said plurality of data lines;
- and
- a first inter-layer insulating film provided between said plurality of capacitance lines and said plurality of light-shielding films, wherein
- said plurality of capacitance lines and said plurality of light-shielding films are each electrically connected via contact holes opened in said first-interlayer insulating film at positions overlapping said plurality of data lines on a plane.
6 more elements
A liquid crystal device, comprising:
- a pair of substrates including a first substrate and a second substrate;
- a plurality of pixel electrodes arrayed in a matrix on said second substrate;
- a liquid crystal held between said pair of substrates;
- a plurality of thin film transistors, each transistor connected to said plurality of pixel electrodes;
- a plurality of data lines and plurality of scanning lines mutually intersecting;
- a plurality of storage capacitors connected to said plurality of pixel electrodes;
- light-shielding films provided at positions covering at least a channel area of said plurality of thin film transistors when viewed from a second substrate side, each light-shielding film being electrically connected to said plurality of storage capacitors;
- a first inter-layer insulating film provided between said light-shielding films and said thin-film transistors;
- a second inter-layer insulating film provided above said scanning lines and below said data lines, and
- a third inter-layer insulating film provided above said data lines and below said pixel electrodes, a third inter-layer insulating film side which faces said liquid crystal being flattened by at least one of said first inter-layer insulating film, said second inter-layer insulating film, and said third inter-layer insulating film recessed at portions facing at least one of said thin film transistors, said data lines, said scanning lines, and said storage capacitors.
7 more elements
A liquid crystal device, comprising:
- a pair of substrates including a first substrate and a second substrate;
- a plurality of pixel electrodes arrayed in a matrix on said second substrate;
- a liquid crystal held between said pair of substrates;
- a plurality of thin film transistors, each transistor connected to said plurality of pixel electrodes;
- a plurality of data lines and plurality of scanning lines mutually intersecting;
- a plurality of capacitor lines serving as a first storage capacitor electrode;
- a plurality of second storage capacitor electrodes connected to said plurality of pixel electrodes;
- light-shielding films provided at positions covering at least a channel area of said plurality of thin film transistors when viewed from a second substrate side, each light-shielding film being electrically connected to said plurality of capacitor lines;
- and
- wherein said light-shielding films are provided in an island-like manner at positions so as to overlap at least one of said plurality of scanning lines and said plurality of capacitor lines when viewed from a second substrate side, and each of the plurality of the island-shaped portions arrayed parallel to said scanning lines are electrically connected via said plurality of capacitor lines.
7 more elements
Dependencies are inferred from the claim text.