Source: http://www.google.com/patents/US8125584?dq=4168396
Timestamp: 2015-05-30 19:43:14
Document Index: 49836034

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Patent US8125584 - Liquid crystal display panel and liquid crystal display device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe present invention provides a liquid crystal display panel capable of providing a high contrast ratio with a storage capacitance being secured, and also provides a liquid crystal display device including such a panel. The present invention is a liquid crystal display panel having a structure in which...http://www.google.com/patents/US8125584?utm_source=gb-gplus-sharePatent US8125584 - Liquid crystal display panel and liquid crystal display deviceAdvanced Patent SearchPublication numberUS8125584 B2Publication typeGrantApplication numberUS 12/445,518PCT numberPCT/JP2007/067192Publication dateFeb 28, 2012Filing dateSep 4, 2007Priority dateJan 17, 2007Also published asCN101568876A, CN101568876B, EP2096488A1, EP2096488A4, EP2096488B1, US20100033643, WO2008087764A1Publication number12445518, 445518, PCT/2007/67192, PCT/JP/2007/067192, PCT/JP/2007/67192, PCT/JP/7/067192, PCT/JP/7/67192, PCT/JP2007/067192, PCT/JP2007/67192, PCT/JP2007067192, PCT/JP200767192, PCT/JP7/067192, PCT/JP7/67192, PCT/JP7067192, PCT/JP767192, US 8125584 B2, US 8125584B2, US-B2-8125584, US8125584 B2, US8125584B2InventorsSatoshi Horiuchi, Toshiaki Fujihara, Masakatsu Tominaga, Hitoshi Matsumoto, Hironobu Sawada, Ryohki ItohOriginal AssigneeSharp Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (43), Non-Patent Citations (3), Classifications (11), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetLiquid crystal display panel and liquid crystal display device
US 8125584 B2Abstract
The present invention provides a liquid crystal display panel capable of providing a high contrast ratio with a storage capacitance being secured, and also provides a liquid crystal display device including such a panel. The present invention is a liquid crystal display panel having a structure in which a liquid crystal layer is interposed between a first substrate and a second substrate, wherein at least one of the first substrate and the second substrate includes a projection for liquid crystal alignment control, the first substrate includes a scanning signal line, a data signal line, a drain electrode electrically connected to a pixel electrode, a switching element, and a storage capacitor wiring, the storage capacitor wiring includes a main wiring part and a branch part, the branch part being connected to the main wiring part and overlapping with the projection for liquid crystal alignment control.
The present invention relates to a liquid crystal display panel and a liquid crystal display device. More particularly, the present invention relates to an active matrix liquid crystal display panel including a storage capacitor element, and a liquid crystal display device including such a liquid crystal display panel.
A liquid crystal display device is a flat panel display that is now most widely used. Particularly, an active matrix liquid crystal display device including a TFT (thin film transistor) is now being used in consumer equipments such as a personal computer, a word processor, and a cellular phone, and its market is expected to be further expanded. With expansion of the market, further improvement in image quality is needed for such a liquid crystal display device.
The present invention has been made in view of the above-mentioned state of the art. The present invention has an object to provide a liquid crystal display panel that can provide a high contrast ratio with a storage capacitance being secured, and to provide a liquid crystal display device including such a liquid crystal display panel.
In the first liquid crystal display panel of the present invention, the above-mentioned storage capacitor wiring includes: a main wiring part; and a branch part, and the branch part is connected to the main wiring part and it is arranged to overlap with the projection for liquid crystal alignment control. The main wiring part of the storage capacitor wiring corresponds to a body of the wiring, needed for feeding storage capacitor signals into a plurality of pixels. The branch part of the storage capacitor wiring is a part branched from the main wiring part. The branch part is generally arranged into each pixel. In the present description, the term “overlap” means that a region where one component is arranged overlaps with a region where the other is arranged when the liquid crystal display panel is viewed in the normal direction. The branch part of the storage capacitor wiring may not overlap with the entire projection for liquid crystal alignment control as long as it overlaps with at least part of the projection for liquid crystal alignment control. The entire branch part may not overlap with the project for liquid crystal alignment control. Preferably, the above-mentioned branch part covers the region where the projection for liquid crystal alignment control is arranged. It is preferable that the branch part is arranged along the projection for liquid crystal alignment control to overlap with the projection for liquid crystal alignment control.
The liquid crystal display panel of the present invention can provide a high contrast ratio with a storage capacitance being secured because of the above-mentioned configuration. Further, an area of a storage capacitor wiring and an area of an electrode facing the storage capacitor wiring, equivalent to a storage capacitance formed at the branch part of the storage capacitor wiring and/or the drain electrode, each overlapping with the projection for liquid crystal alignment control, can be reduced. Accordingly, the storage capacitor wiring can be thinned as far as a resistance of the storage capacitor wiring can be suppressed to an acceptable value or less.
The present invention is mentioned in more detail below with reference to Embodiments, using drawings. However, the present invention is not limited to only these Embodiments.
FIG. 1 is a planar view schematically showing a configuration of one pixel in a liquid crystal display panel in accordance with Embodiment 1. The liquid crystal display panel in the present Embodiment has a structure in which a liquid crystal layer is interposed between an active matrix substrate and a color filter substrate. FIG. 1 mainly shows a pixel configuration of the active matrix substrate, and omits components of the color filter substrate, other than a projection for alignment control 10. FIG. 2 is a cross-sectional view schematically showing the liquid crystal display panel taken along line A-B in FIG. 1.
“Production Method of Active Matrix Substrate”
“Production Method of Color Filter Substrate”
“Assembly of Liquid Crystal Display Panel”
FIG. 3 is a planar view schematically showing a configuration of one pixel of a liquid crystal display panel in Embodiment 2. As shown in FIG. 3, in the liquid crystal display panel in accordance with the present Embodiment, a drain electrode 53 is arranged to overlap with the main wiring part 51 a and the branch part 51 b, which is positioned on the TFT 14 side, of the storage capacitor wiring 51. That is, the drain electrode 53 is composed of a main electrode part 53 a and one branch part 53 b. The main electrode part 53 a faces the main wiring part 51 a of the storage capacitor wiring 51 with the gate insulating film 4 therebetween. The branch part 53 b faces the branch part 51 b of the storage capacitor wiring 51 with the gate insulating film 4 therebetween. Accordingly, the liquid crystal display panel in the present Embodiment has the same configuration as in Embodiment 1, except that the drain electrode 53 is not formed at a position overlapping with the branch part 51 c, which is positioned on the side opposite to the TFT 14 side. The liquid crystal display panel in the present Embodiment can be preferably used if a sufficient storage capacitance is secured by the main wiring 51 a and the branch part 51 b. Embodiment 3
FIG. 4 is a planar view schematically showing a configuration of one pixel of a liquid crystal display panel in accordance with Embodiment 3. As shown in FIG. 4, in the liquid crystal display panel in accordance with the present Embodiment, a drain electrode 54 is arranged to overlap with the main wiring part 51 a of the storage capacitor wiring 51, substantially the entire branch part 51 b on the TFT 14 side, and substantially half of the branch part 51 c on the side opposite to the TFT 14 side. That is, the drain electrode 54 is composed of a main electrode 54 a and two branch parts 54 b, 54 c. The main electrode part 54 a faces the main wiring part 51 a of the storage capacitor wiring 51 with the gate insulating film 4 therebetween. The two branch parts 54 b, 54 c face the branch parts 51 b, 51 c of the storage capacitor wiring 51 with the gate insulating film 4 therebetween. The liquid crystal display panel in the present Embodiment has the same configuration as in Embodiment 1, except that the branch part 54 c of the drain electrode 54 and the branch part 51 c of the storage capacitor wiring 51 have different lengths, and that instead that the branch part 54 c is arranged to overlap with substantially the entire branch part 51 c, the branch part 54 c is arranged to overlap with half of the branch part 51 c. As in the liquid crystal display panel in the present Embodiment, the end position of the branch part 51 c is different form the end position of the branch part 54 c facing the branch part 51 c. Thus, the magnitude of the storage capacitance can be easily adjusted.
FIG. 5 is a planar view schematically showing a configuration of one pixel of the liquid crystal display panel in accordance with Embodiment 4. The liquid crystal display panel in the present Embodiment has a structure in which the liquid crystal layer is interposed between the active matrix substrate and the color filter substrate. FIG. 5 mainly shows a pixel configuration of the active matrix substrate, and omits components of the color filter substrate, other than the projection for alignment control 10. FIG. 6 is across-sectional view schematically showing the liquid crystal display panel taken along line C-D in FIG. 5.
FIG. 7 is a planar view schematically showing a configuration of one pixel of a liquid crystal display panel in accordance with Embodiment 5. As shown in FIG. 7, in the liquid crystal display panel in accordance with the present Embodiment, a storage capacitor wiring 71 is composed of a main wiring part 71 a and four branch parts 71 b, 71 c, 71 d, and 71 e. The main wiring part 71 a passes the center of the pixel region. The branch parts 71 b, 71 c extend toward one side of the main wiring part 71 a and the branch parts 71 d, 71 e extend toward the other side thereof. The branch parts 71 b, 71 c and the branch parts 71 d, 71 e are symmetric with respect to the main wiring part 71 a. A drain electrode 72 is composed of a main electrode part 72 a and branch parts 72 b, 72 c, 72 d, 72 e. The main electrode part 72 a faces the main wiring part 71 a of the storage capacitance wiring 71 with a gate insulating film therebetween. The four branch parts 72 b, 72 c, 72 d, 72 e of the drain electrode 72 face the branch parts 71 b, 71 c, 71 d, 71 e of the storage capacitor wiring 71 with the gate insulating film therebetween. Thus, in the present invention, the numbers of the branch part of the storage capacitor wiring and the branch part of the drain electrode are not especially limited.
FIG. 8 is a planar view schematically showing a configuration of one pixel in a liquid crystal display panel in accordance with Embodiment 6. As shown in FIG. 8, in the liquid crystal display panel in according to the present Embodiment, the pixel electrode 7 is arranged into a V shape, and an electrode slit 7 a, a projection for liquid crystal alignment control 10 a and the branch parts 71 b, 71 c, 71 d, 71 e of the storage capacitor wiring 71 are arranged into a V shape to overlap with the pixel electrode 7. The storage capacitor wiring 71 is composed of the main wiring part 71 a and the four branch parts 71 b, 71 c, 71 d, and 71 e. The main wiring part 71 a crosses the center of the pixel region. The branch parts 71 b, 71 c extend toward one side of the main wiring part 71 a and the branch parts 71 d, 71 e extend toward the other side thereof. The branch parts 71 b, 71 c and the branch parts 71 d, 71 e are symmetric with respect to the main wiring part 71 a. The drain electrode 72 is composed of the main electrode part 72 a and the branch parts 72 b, 72 c, 72 d, 72 e. The main electrode part 72 a faces the main wiring part 71 a of the storage capacitor wiring 71 with the gate insulating film therebetween. The branch parts 72 b, 72 c, 72 d, 72 e face the four branch parts 71 b, 71 c, 71 d, 71 e of the storage capacitor wiring 71 respectively with the gate insulating film therebetween. According to the liquid crystal display panel in the present Embodiment, the bend parts (bottom parts) of the V shape in the pixel electrode 7, the electrode slit 7 a, the projection for liquid crystal alignment control 10 a, the branch parts 71 b, 71 c, 71 d, 71 e of the storage capacitor wiring 71, and the branch parts 72 b, 72 c, 72 d, 72 e of the drain electrode 72 are all positioned above the main wiring part 71 a of the storage capacitor wiring 71. According to this embodiment, the projection for liquid crystal alignment control 10 a divides the pixel region in MVA mode into a plurality of domains having equal areas, and as a result, display qualities of the liquid crystal display device can be preferably improved.
The terms “or more” and “or less” in the present description mean that the value described (boundary value) is included.
FIG. 1 is a planar view schematically showing a configuration of one pixel of the liquid crystal display panel in accordance with Embodiment 1.
3: Scanning signal line
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