Abstract: A pixel of a liquid crystal display device includes a scan line, a signal line, a TFT, a lower electrode, and an upper electrode arranged thereon with a protection film interposed therebetween, in which the upper electrode includes a plurality of branch electrode parts electrically connected in common, and a gap part between the branch electrode parts. The upper electrode includes a region in which a ratio of a width of the gap part to a width of the branch electrode part that is adjacent to the gap part is different, and includes both of a region in which a light transmittance increases and a region in which the light transmittance decreases with respect to a change in the ratio.

Abstract: Source lines cross, over an intervening first insulation film, gate lines on an insulation substrate. Switching elements are on crossings between the gate lines and the source lines. Pixel electrodes are connected to the switching elements. Common electrodes facing the pixel electrodes generate between the pixel electrodes and the common electrodes an electric field directed approximately parallel to the insulation substrate. First shielding electrode patterns along the source lines in a layer, with the first insulation film intervening, underneath the source lines, at least partially overlap the source lines widthwise. Plural second shielding electrode patterns are formed along the source lines, overlapping the first shielding electrode patterns and without substantially overlapping the source lines in a layer, with a second insulation film intervening, above the source lines. The first shielding electrode patterns having a same electric potential as the plural second shielding electrode patterns.

Abstract: A semi-transparent TFT array substrate has a TFT including a source electrode, a gate electrode, and a drain electrode. The substrate also has an auxiliary capacitive wiring and a reflective pixel electrode. Further, the substrate has a transparent pixel electrode including an electrode extending from a corner of the rest of the transparent pixel electrode to an edge of the auxiliary capacitive wiring closest to a gate wiring connected to the gate electrode. In addition, the substrate has a source wiring connected to the source electrode. The auxiliary capacitive wiring overlaps a space existing between the reflective pixel electrode and the source wiring. The electrode is disposed between the reflective pixel electrode and the source wiring. A connection which connects the electrode and the rest of the transparent pixel electrode does not overlap the auxiliary capacitive wiring in a plan view. The connection does not overlap the gate wiring.

Abstract: A thin-film transistor array substrate includes a source line that is formed above a gate insulating layer covering a gate line, a semiconductor layer that is formed on the gate insulating layer and placed in a substantially whole area below a drain electrode, in a substantially whole area below a source electrode, in a substantially whole area below the source line and in a position opposite to the gate electrode, a pixel electrode that is formed directly on the drain electrode, a transparent conductive pattern that is formed directly on the source electrode and the source line in the same layer as the pixel electrode, and a counter electrode that is formed on an interlayer insulating layer covering the pixel electrode and the transparent conductive pattern and generates a fringe electric field with the pixel electrode.

Abstract: The present invention intends to provide a manufacturing method of a semi-transmissive liquid crystal display device in which method a structure and manufacturing process thereof are simplified to enable to reduce the manufacturing cost. In order to achieve the above object, a semi-transmissive liquid crystal display device in the invention has a layer constitution in which a reflective pixel electrode is formed with a second conductive film that constitutes a source electrode, a drain electrode, a source wiring and so on and on an upper layer of the second metal film a transmissive pixel electrode made of a transparent conductive film is formed through the insulating film. A TFT array substrate can be formed through 5 times of photoengraving process.

Abstract: A transflective liquid crystal display device in which a transmissive area to transmit light to a pixel area and a reflective area as well as a thin film transistor are arranged on an insulating substrate, includes an TFT array substrate having plural gate wirings each provided with a gate electrode and a storage capacitive wiring provided with a storage capacitive electrode made of a first conductive film, plural source wirings each provided with a source electrode and a drain electrode made of a second conductive film, a reflecting pixel electrode extending from the drain electrode, and a transmissive pixel electrode formed through a second insulating film, and an opposite substrate arranged oppositely to the TFT array substrate. The source wirings and the reflecting pixel electrode are arranged apart from each other by a predetermined interval, and a contrast preventing electrode is formed over the interval on the second insulating film.

Abstract: A liquid crystal display device includes a gate line placed above a substrate, a gate insulating layer to cover the gate line, a source line placed above the gate insulating layer, an interlayer insulating layer to cover the source line, a comb-shaped or slit-shaped pixel electrode electrically connected a drain electrode of a TFT through a contact hole penetrating the interlayer insulating layer, a first counter electrode placed below and opposite to the pixel electrode with an insulating layer interposed therebetween to generate an oblique electric field with the pixel electrode, and a second counter electrode formed in the same layer as the pixel electrode and placed overlapping the source line in a given area to generate an in-plane electric field with the pixel electrode.

Abstract: The liquid crystal display device, in which liquid crystal is filled between a TFT array substrate having a TFT and a counter substrate placed opposite to the TFT array substrate, includes a pixel electrode placed at least partly directly over or under a drain electrode of the thin film transistor so as to directly overlap the drain electrode, an interlayer insulating layer placed to cover the pixel electrode, and a counter electrode placed on the interlayer insulating layer and having a slit to generate a fringe electric field with the pixel electrode, wherein the counter electrode is placed to overlap a gate line connected to a gate electrode of the TFT in at least part of area and connected to the counter electrode in an adjacent pixel across the gate line.

Abstract: An active matrix substrate according to one aspect of the present invention is a TFT array substrate including a TFT. The active matrix substrate includes a gate signal line electrically connected to a gate electrode of the TFT, a first insulating film formed above the gate signal line, an auxiliary capacitance electrode formed above the first insulating film and supplied with a common potential, a second insulating film formed above the auxiliary capacitance electrode, a source signal line formed above the second insulating film and electrically connected to a source electrode of the TFT, a third insulating film formed above the source signal line, and a pixel electrode formed above the third insulating film so that the pixel electrode overlaps with a part of the auxiliary capacitance electrode.

Abstract: A thin film transistor array substrate includes a reflective electrode, a storage capacitor electrode disposed below the reflective electrode with a first insulation layer interposed therebetween, a second insulation layer disposed above the reflective electrode, the second insulation layer having a contact hole in an area where the storage capacitor electrode is not disposed, a transmissive electrode electrically connected to the reflective electrode through the contact hole, and a thickness compensation pattern disposed below the reflective electrode in an area having the contact hole. The thickness compensation pattern is isolated from the storage capacitor electrode.

Abstract: A liquid crystal display includes a liquid crystal layer held between an array substrate and an opposing substrate that are placed opposed to each other and a reflector and a transparent regions in one pixel. The array substrate includes a reflective common electrode provided in the reflector region, a reflective common electrode provided in the reflector region for generating an oblique electric field between the reflective pixel electrode, a transparent common electrode provided in the transparent region and a transparent pixel electrode provided in the transparent region for generating a horizontal electric field between the transparent common electrode.

Abstract: A method of producing a thin film transistor array substrate which includes an insulating substrate, a display pixel having a pixel electrode connected to a drain electrode, a gate wiring, and a source wiring perpendicular to the gate wiring, comprising forming a first thin metal multi-layer film an upper layer of which includes aluminum, and spreading a photo-resist, forming the photo-resist to a thickness less in an area connected to a second thin metal film than other area, patterning the first thin metal film, reducing a thickness of the photo-resist layer and removing the photo-resist in the area, removing the upper layer in the area to expose a lower layer, forming an interlayer insulating film and patterning it to expose the lower layer in the area, and patterning the second thin metal film to include the area, to connect the lower layer to the second thin metal film.

Abstract: A transflective liquid crystal display device comprising: a first substrate; a second substrate having an opposing electrode; and a liquid crystal layer; wherein the first substrate includes: gate wires; source wires that cross the gate wires in plan view; a reflective pixel electrode that is formed apart from the source wires by a predetermined region in a reflective region, the reflective region is a part of a unit pixel region partitioned by the gate wires and the source wires; and a reflective contrast reduction preventing electrode formed above the reflective pixel electrode in the predetermined region, and the reflective contrast reduction preventing electrode having a region overlapping with the reflective pixel electrode in plan view; and wherein the reflective contrast reduction preventing electrode is connected to the reflective pixel electrode; and the reflective pixel electrode includes a constricted part in close proximity to the contact hole in plan view.

Abstract: A method of producing a thin film transistor array substrate which includes an insulating substrate, a display pixel having a pixel electrode connected to a drain electrode, a gate wiring, and a source wiring perpendicular to the gate wiring, comprising forming a first thin metal multi-layer film an upper layer of which includes aluminum, and spreading a photo-resist, forming the photo-resist to a thickness less in an area connected to a second thin metal film than other area, patterning the first thin metal film, reducing a thickness of the photo-resist layer and removing the photo-resist in the area, removing the upper layer in the area to expose a lower layer, forming an interlayer insulating film and patterning it to expose the lower layer in the area, and patterning the second thin metal film to include the area, to connect the lower layer to the second thin metal film.

Abstract: A method of producing a thin film transistor array substrate which includes an insulating substrate, a display pixel having a pixel electrode connected to a drain electrode, a gate wiring, and a source wiring perpendicular to the gate wiring, comprising forming a first thin metal multi-layer film an upper layer of which includes aluminum, and spreading a photo-resist, forming the photo-resist to a thickness less in an area connected to a second thin metal film than other area, patterning the first thin metal film, reducing a thickness of the photo-resist layer and removing the photo-resist in the area, removing the upper layer in the area to expose a lower layer, forming an interlayer insulating film and patterning it to expose the lower layer in the area, and patterning the second thin metal film to include the area, to connect the lower layer to the second thin metal film.

Abstract: A liquid crystal display device according to an embodiment of the present invention is a horizontal electric field type liquid crystal display. In the device, a liquid crystal layer is sandwiched between a first substrate and a second substrate opposite to each other, pixels arranged in matrix include a transmissive region and a reflective region, and the first substrate include a pixel electrode and a common electrode for applying a voltage to the liquid crystal layer. An about-?/2-wave plate, an about-?/4-wave plate, and a polarizing plate are provided opposite to the liquid crystal layer in the first substrate in this order from the first substrate side. An about-?/4-wave plate and a polarizing plate are provided opposite to the liquid crystal layer in the second substrate in this order from the second substrate side.

Abstract: The present invention provides a transflective liquid crystal display device that has reflective contrast reduction preventing electrodes formed in given positions and that is capable of preventing bright dot defects while preventing reduction of reflective contrast. In a reflective region in a pixel region, a reflective electrode is formed in the same layer as source bus lines and separated by given spaces from the source bus lines. Reflective contrast reduction preventing electrodes are formed above the given spaces and have areas overlapping the reflective electrode in plane view, with an insulating film formed between them. The reflective contrast reduction preventing electrodes are in an electrically floating state.

Abstract: A liquid crystal display includes a liquid crystal layer held between an array substrate and an opposing substrate that are placed opposed to each other and a reflector and a transparent regions in one pixel. The array substrate includes a reflective common electrode provided in the reflector region, a reflective common electrode provided in the reflector region for generating an oblique electric field between the reflective pixel electrode, a transparent common electrode provided in the transparent region and a transparent pixel electrode provided in the transparent region for generating a horizontal electric field between the transparent common electrode.

Abstract: A thin film transistor array substrate includes a reflective electrode, a storage capacitor electrode disposed below the reflective electrode with a first insulation layer interposed therebetween, a second insulation layer disposed above the reflective electrode, the second insulation layer having a contact hole in an area where the storage capacitor electrode is not disposed, a transmissive electrode electrically connected to the reflective electrode through the contact hole, and a thickness compensation pattern disposed below the reflective electrode in an area having the contact hole. The thickness compensation pattern is isolated from the storage capacitor electrode.

Abstract: A method of driving a liquid crystal display device of IPS mode is disclosed. The liquid crystal display device includes a pair of substrates, a liquid crystal layer placed between the substrates, gate lines placed above one of the substrates, source lines placed to cross the gate lines with an insulative layer interposed therebetween, a switching element placed near the crossing point of the gate lines and the source lines, and a pixel electrode connected to the source lines through the switching element. A signal voltage required for image display is supplied to the pixel electrode by the source line through the switching element. The method sets an average value of the signal voltage in such a way that an average value of a positive polarity voltage and a negative polarity voltage of the pixel electrode varies with a grayscale to be displayed, and inputs the average value of the signal voltage to the pixel electrode.