Sanyo Electric Co., Ltd.

Other

Sony Corporation

Kazuto Noritake

Minoru Nakano

Takao Suzuki

Hideki Matsuoka

Keiichi Sano

Norio Oku

Yasuo Segawa

Toshifumi Yamaji

Susumu Oima

Shinji Ogawa

Yasushi Miyajima

Ryuji Nishikawa

Yusuke Tsutsui

Mitsugu Kobayashi

Masayuki Koga

Masahiko Kawabe

A display device in which variations of characteristics of a TFT are eliminated and the aperture ratio is improved is provided. A display device has a thin film transistor on an insulating substrate. The thin film transistor includes first gate electrodes, a gate insulating film, a semiconductor filmwhich is formed on the first gate electrode, and a interlayer insulating film. The thin film transistor further includes second gate electrodeswhich are on the interlayer insulating filmand at least above channels, and which are connected to the first gate electrodes. A reflective display electrodeconnected to the source of the thin film transistor is elongated to extend above the thin film transistor.

Display device

The supply voltage to a driving circuit ( ) and LCD ( ) generated by a power supply circuit ( ) is controlled to be periodically turned on and off during a power save mode, using a timer circuit ( ) or timer such as a counting circuit. In this manner, during the power save mode, the power consumption can be reduced by turning off the power supply, and, at the same time, the display can be periodically shown without any further manipulation. By suspending the output of the gate selection signals to the display panels before the control to turn off the power supply, the display immediately before the turn off operation can be maintained even after the power supply is turned off.

Driving device for display device

Between a substrate comprising reflective display electrodes each including a flat portion, a slope portion, and a base portion, and TFTs, and an opposing substrate on which a color filter and an opposing electrode is accumulated, and on the side of viewer, a light diffuser layer having the haze value of 33%, a retardation film, and a polarization film are provided, liquid crystal is disposed. The angle of inclination (angle of elevation) of the slope portion with regard to the base portion is greater than 0&deg; and 8&deg; or less. With this structure, it is possible to provide a reflective LCD capable of achieving increased luminance in each display pixel and of providing bright display over a wide range of viewing angles.

Reflective liquid crystal display

A display device in which variations of characteristics of a TFT are eliminated and the aperture ratio is improved is provided. A display device has a thin film transistor on an insulating substrate . The thin film transistor includes first gate electrodes , a gate insulating film , a semiconductor film which is formed on the first gate electrode , and a interlayer insulating film . The thin film transistor further includes second gate electrodes which are on the interlayer insulating film and at least above channels , and which are connected to the first gate electrodes . A reflective display electrode connected to the source of the thin film transistor is elongated to extend above the thin film transistor.

A reflection type liquid crystal display comprises first and second substrates disposed facing each other and holding a liquid crystal exhibiting a negative dielectric constant anisotropy between them, the first substrate ( ) has on the side of its surface facing the second substrate a TFT as a switching element, a reflective display electrode ( ) formed of a conductive reflective material and connected to the TFT and a vertical alignment film for vertically aligning the liquid crystal molecules. The second substrate ( ) has on the side facing the first substrate a counter electrode ( ) including an alignment control window ( ) for controlling the alignment of the liquid crystal molecules and an alignment film. The second substrate ( ) has on the viewing side of the display, the side of its surface not facing the first substrate, a phase plate ( ) and a polarizer ( ) forms. A light diffusing layer is formed on the side of the second substrate facing or not facing the first substrate. With this configuration, the display device when viewed from the viewing side is free of the occurrence of parallax and provides a wide viewing angle.

Reflection type liquid crystal display

A reflection type liquid crystal display comprises a substrate ( ) provided with a TFT and a reflective display electrode ( ) connected to the TFT, a counter electrode substrate ( ) having a color filter ( ), and a counter electrode ( ), and provided with a light diffusing layer ( ), a phase plate ( ) and a polarizer ( ) on the side of an observer , and a liquid crystal ( ) held between the substrates. The surface of the reflective display electrode ( ) facing the liquid crystal ( ) is concaved toward the substrate ( ), so that a reflected light is prevented from leaking to adjacent pixels, and prevented from being radiated to a black matrix in the vicinity of the pixels. A bright display can be obtained a wide viewing angle.

Between a substrate comprising reflective display electrodes each including a flat portion, a slope portion, and a base portion, and TFTs, and an opposing substrate on which a color filter and an opposing electrode is accumulated, and on the side of viewer, a light diffuser layer having the haze value of 33%, a retardation film, and a polarization film are provided, liquid crystal is disposed. The angle of inclination (angle of elevation) of the slope portion (SL) with regard to the base portion is greater than 0&deg; and 8&deg; or less. With this structure, it is possible to provide a reflective LCD capable of achieving increased luminance in each display pixel and of providing bright display over a wide range of viewing angles.

Reflective liquid crystal display having increase luminance for each display pixel

On an insulating substrate, there are formed a first gate electrode, a gate insulating film, a semiconductor film, and an interlayer insulating film. Above the interlayer insulating film, a TFT is formed having a second gate electrode connected to the first gate electrode. Then, a photosensitive resin is formed over the entire surface of the extant layers. Subsequently, first exposure is applied using a first mask, and second exposure is then applied using a second mask with a larger amount of light than used for the first exposure. The second mask has an opening at a position corresponding to a source. Thereafter, the photosensitive resin film is developed thereby forming a contact hole and a concave.

Manufacturing method for reflection type liquid crystal display

An insulator substrate ( ) is provided with a TFT including a first gate electrode ( ), a gate insulating film ( ), a semiconductor film ( ) disposed above the first gate electrode ( ), and an interlayer insulating film ( ). On the interlayer insulating film ( ) in a position above a channel ( ), the TFT further includes a second gate electrode ( ) connected to the first gate electrode ( ). A reflective display electrode ( ) composed of a reflective material and connected to a source ( ) of the TFT is arranged to extend over the TFT. In addition, the gap ( ) between adjacent reflective display electrodes ( ) is arranged in a position other than a position above a drain signal line ( ). With this arrangement, even when a black image is displayed on a crystal display device of a normally white mode, display defects due to reflection of incident light by a signal line are prevented. Furthermore, a reflection type liquid crystal display device having a high aperture rate and minimal fluctuation in the TFT characteristics can be achieved.

Display electrode arrangement for a reflection type liquid crystal display device

On an insulating substrate ( ), there are formed a first gate electrode ( ), a gate insulating film ( ), a semiconductor film ( ), and an interlayer insulating film ( ). Above the interlayer insulating film ( ), a TFT is formed having a second gate electrode ( ) connected to the first gate electrode ( ). Then, a photosensitive resin ( ) is formed over the entire surface of the extant layers. Subsequently, first exposure ( ) is applied using a first mask ( ), and second exposure ( ) is then applied using a second mask ( ) with a larger amount of light than used for the first exposure. The second mask ( ) has an opening at a position corresponding to a source ( ). Thereafter, the photosensitive resin film ( ) is developed thereby forming a contact hole ( ) and a recess ( ).

A glass board used in the production of liquid crystal panels includes a matrix of individual substrates. Each of the substrates has a contact portion of an electrode formed on one of its principle surfaces. The individual substrates are spaced from each other so that the contact portions of adjacent substrates are not in contact with each other. Thus, when the individual substrates are cut, the contact portions are not weakened and contaminants are prevented from getting between the contact portions and the substrates.

Glass board used in the production of liquid crystal panels

A liquid crystal display device has a liquid crystal layer formed between first and second insulating substrates. A wiring layer, an insulation film and a first orientation layer are formed on the first substrate between it and the liquid crystal layer. A electrode layer and a second orientation film are formed on the second substrate between it and the liquid crystal layer. The wiring layer includes grooves along its peripheral portion which allow the insulation film to contact the first substrate, which promotes bonding and inhibits peeling of the insulation film from the wiring layer.

Liquid crystal display device

A mother glass board used to fabricate multiple liquid crystal display panels includes a substrate on which the liquid crystal panel portions are formed. An orientation film is formed on the liquid crystal panel portions. A pattern of metallic film is formed on the substrate outside that portion of the substrate on which the liquid crystal panel portions are located. The patterns include an alignment mark and an identifier mark used in the liquid crystal panel production process. An enclosure surrounding the liquid crystal panel portions is formed on the substrate between the pattern and the liquid crystal panel portions. The enclosure prevents stripes from being formed on the orientation film during a rubbing step in the production process in which the liquid crystal panel portions are rubbed with a cloth.

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Gifu, Japan

Kazuto Noritake