Liquid crystal display device and manufacturing method for same
First Claim
1. A liquid crystal display device, comprising a pair of substrates positioned so as to face each other and sandwich liquid crystal, whereingate signal lines made of a light blocking material which run in a first direction and are aligned in a second direction which crosses said first direction, and drain signal lines made of a light blocking material which run in said second direction and are aligned in said first direction, are formed on the surface of one of the two substrates, on the liquid crystal side, andthin film transistors which are turned on by a scanning signal through a gate signal line and pixel electrodes to which a video signal is supplied from a drain signal line through a thin film transistor when turned on are provided in pixel regions, pixel regions being defined as regions surrounded by two adjacent gate signal lines and two adjacent drain signal lines, wherein:
- each of said pixel regions is provided with at least a gate signal line, a drain signal line and a color filter formed in a layer above a thin film transistor,overlapping regions between adjacent first color filters and second color filters are provided in regions in which said drain signal lines or said gate signal lines are formed as viewed from the top,each of the first color filters in the overlapping regions is underlying each of the second color filters in the overlapping regions, andthe angle of the first taper of said first color filters formed in said overlapping regions is set to 45°
or more and 90°
or less relative to the surface of said drain signal lines or gate signal lines, the angle of the second taper of said second color filters formed in said overlapping regions is set to 45°
or more and 90°
or less relative to the surface of said first color filters, the angle of the first taper is smaller than the angle of the second taper, and the width of said signal lines is set to 1 μ
m or more and 4 μ
m or less.
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Abstract
A liquid crystal display device with a higher aperture ratio is provided. According to one embodiment of the present invention, second color filters are formed so as to overlap with first color filters when adjacent color filters having different colors are formed on the TFT substrate side, so that the angle of the first tapers where said first color filters overlap and the angle of the second tapers where said second color filters overlap are set to 45° or more and 90° or less.
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Citations
21 Claims
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1. A liquid crystal display device, comprising a pair of substrates positioned so as to face each other and sandwich liquid crystal, wherein
gate signal lines made of a light blocking material which run in a first direction and are aligned in a second direction which crosses said first direction, and drain signal lines made of a light blocking material which run in said second direction and are aligned in said first direction, are formed on the surface of one of the two substrates, on the liquid crystal side, and thin film transistors which are turned on by a scanning signal through a gate signal line and pixel electrodes to which a video signal is supplied from a drain signal line through a thin film transistor when turned on are provided in pixel regions, pixel regions being defined as regions surrounded by two adjacent gate signal lines and two adjacent drain signal lines, wherein: -
each of said pixel regions is provided with at least a gate signal line, a drain signal line and a color filter formed in a layer above a thin film transistor, overlapping regions between adjacent first color filters and second color filters are provided in regions in which said drain signal lines or said gate signal lines are formed as viewed from the top, each of the first color filters in the overlapping regions is underlying each of the second color filters in the overlapping regions, and the angle of the first taper of said first color filters formed in said overlapping regions is set to 45°
or more and 90°
or less relative to the surface of said drain signal lines or gate signal lines, the angle of the second taper of said second color filters formed in said overlapping regions is set to 45°
or more and 90°
or less relative to the surface of said first color filters, the angle of the first taper is smaller than the angle of the second taper, and the width of said signal lines is set to 1 μ
m or more and 4 μ
m or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A manufacturing method for a liquid crystal display device comprising:
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a pair of substrates provided so as to face each other and sandwich liquid crystal, gate signal lines which run in a first direction and are aligned in a second direction which crosses said first direction, and drain signal lines which run in said second direction and are aligned in said first direction; thin film transistors driven by a scanning signal from a gate signal line; and color filters formed so as to cover said gate signal lines, said drain signal lines and said thin film transistors, and pixel electrodes formed in a layer above these color filters, by comprising; forming said color filters with color overlapping portions where adjacent color filters overlap, and at the same time creating contact holes for electrically connecting said pixel electrodes to said thin film transistors; and carrying out halftone exposure to light in the contact hole portions of said color filters, the color overlapping portions, or both, so that the angle of the taper in said color overlapping portion is smaller than the angle of the taper of said contact holes when said color filters are formed in accordance with photolithographic technology;
whereinsaid color filters have color non-overlapping portions where adjacent color filters don'"'"'t overlap; each of the color non-overlapping portions is arranged in an area between adjacent color filters and has the contact hole; and a width of each of the color overlapping portions is narrower than a width of each of the color non-overlapping portions. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A liquid crystal display device, comprising:
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a pair of substrates provided so as to face each other and sandwich liquid crystal, gate signal lines which run in a first direction and are aligned in a second direction which crosses said first direction, and drain signal lines which run in said second direction and are aligned in said first direction; thin film transistors driven by a scanning signal from a gate signal line; and color filters formed so as to cover said gate signal lines, said drain signal lines and said thin film transistors, and pixel electrodes formed in a layer above these color filters, wherein; said color filters have color overlapping portions where adjacent color filters overlap and contact holes for electrically connecting said pixel electrodes to said thin film transistors; and the angle of the taper in said color overlapping portion is smaller than the angle of the taper of said contact holes; said color filters have color non-overlapping portions where adjacent color filters don'"'"'t overlap; each of the color non-overlapping portions is arranged in an area between adjacent color filters and has the contact hole; and a width of each of the color overlapping portions is narrower than a width of each of the color non-overlapping portions. - View Dependent Claims (18, 19, 20, 21)
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Specification