Sharp Kabushiki Kaisha Corporation

Mitsunori Imade

Tetsuo Kikuchi

Hajime Imai

Hideki Kitagawa

Junya Shimada

Yoshihito Hara

Shinya Tanaka

Atsuhito Murai

Jun Nishimura

Kazunori Morimoto

Yoshiharu Kataoka

Takao Matsumoto

A source and drain electrode layer () of an oxide TFT element () is formed by a first conductive layer. A gate electrode () of the oxide TFT element () and a gate electrode () of an a-Si TFT element () are formed by a single conductive layer, that is, a second conductive layer. A source and drain electrode layer () of the a-Si TFT element () is formed by a third conductive layer. The third conductive layer is formed above the second conductive layer in a thickness direction in which each conductive layer is stacked on an insulating substrate (). Further, the first conductive layer is formed below the second conductive layer in the thickness direction. Therefore, it is possible to provide a circuit board that can have an improved degree of integration of transistor elements formed on the insulating substrate.

Circuit board and display device

A circuit board () includes a plurality of transistor elements on an insulating substrate (). At least one of the plurality of transistor elements is an oxide TFT () including, as a channel layer (), an oxide semiconductor. At least one of the plurality of transistor elements is an a-SiTFT () (i) being different from the oxide TFT () in functions as circuit components and (ii) including, as a channel layer (), an amorphous silicon semiconductor. The oxide TFT () is a top gate transistor, and the a-SiTFT () is a bottom gate transistor. This provides: a configuration that can (a) enhance the performance of the circuit board equipped with the TFTs differing in their respective functions as circuit components and (b) reduce the area necessary for mounting the TFTs; and a method for producing the circuit board.

Circuit board and display device including first and second channel layers made of different semiconductor materials

Transflective-type and reflection type liquid crystal display devices having a high image quality are provided with a good production efficiency. A liquid crystal display device according to the present invention is a liquid crystal display device which includes; a first substrate and a second substrate between which liquid crystal is interposed; a first electrode and a second electrode formed on the first substrate for applying a voltage for controlling an orientation of the liquid crystal; a transistor having an electrode which is electrically connected to the first electrode; a metal layer being formed on the first substrate and including a protrusion, a recess, or an aperture; and a reflective layer formed above the metal layer on the first substrate for reflecting incident light toward a display surface. The metal layer is made of a same material as that of a gate electrode of the transistor. The reflective layer includes a protrusion, a recess, or a level difference which is formed in accordance with a protrusion, a recess, or an aperture of the metal layer.

Liquid crystal display and method of manufacturing liquid crystal display

The circuit board () of the present invention includes a plurality of transistor elements provided on a single insulating substrate () for respective pixels that are two-dimensionally arranged or respective pixels in a group of a predetermined number of the pixels. At least one of the plurality of transistor elements is an oxide TFT () having a channel layer () formed by an oxide semiconductor, and at least another of the plurality of transistor elements is an a-Si TFT () having a channel layer () formed by, for example, an amorphous silicon semiconductor. Each of the oxide TFT () and the a-Si TFT () is a bottom-gate transistor.

A liquid crystal display device has a plurality of pixels and a reflection section for reflecting incident light toward a display surface. The reflection section includes a metal layer having a plurality of apertures, and a reflective layer formed on the metal layer with an insulating layer interposed therebetween. A surface of the reflective layer includes a plurality of recesses or protrusions formed in accordance with a cross-sectional shape of the metal layer.

Liquid crystal display device and method of manufacturing liquid crystal display device

A liquid crystal display device according to the present invention includes a vertical alignment type liquid crystal layer. Each pixel electrode thereofhas a plurality of unit electrode portions, each of which has a conductive film and slitsthat have been cut through the conductive film. When a predetermined voltage is applied between the pixel electrode and a counter electrode, a liquid crystal domain is produced in association with each unit electrode portion and liquid crystal molecules in the liquid crystal domain come to have a substantially radially tilting alignment state. As a result, the device of the present invention achieves a wide viewing angle and a fast response characteristic.

Liquid crystal display device having pixel electrode with plurality of unit electrode portions including slits

A liquid crystal display device includes a reflection region for reflecting incident light toward a display surface, wherein, the reflection region includes a metal layer formed on a substrate, a semiconductor layer formed above the metal layer, and a reflective layer formed above the semiconductor layer; and the reflection region includes a first recess formed on a surface of the reflective layer, a second recess formed on the surface of the reflective layer in the first recess, and a third recess formed on the surface of the reflective layer in the second recess. The liquid crystal display device provides a low-cost transflective-type or reflection-type liquid crystal display device having a high image quality.

Liquid crystal display comprising a reflection region having first, second and third recesses and method for manufacturing the same

A transflective-type and a reflection-type liquid crystal display device having a high reflection efficiency and a high image quality are provided. A liquid crystal display device of the present invention is a liquid crystal display device including a reflection region for reflecting incident light toward a display surface, wherein the reflection region includes a metal layer, an insulating layer formed on the metal layer, a semiconductor layer formed on the insulating layer, and a reflective layer formed on the semiconductor layer; a plurality of recesses are formed in at least one of the metal layer, the insulating layer and the semiconductor layer; a plurality of dents are formed in the reflective layer in the reflection region according to the plurality of recesses; and a shortest distance a between edge portions of at least two of the plurality of recesses is 4 &#x3bc;m or less.

Liquid crystal display and method for manufacturing liquid crystal display

A transflective-type and a reflection-type liquid crystal display device having a high reflection efficiency and a high image quality are provided. A liquid crystal display device of the present invention is a liquid crystal display device including a reflection region, wherein the reflection region includes an insulating layer, a semiconductor layer and a reflective layer formed on a metal layer having a plurality of recesses therein; a plurality of protrusions of the metal layer, each having a bottom surface, an upper surface and a slope, are formed between the plurality of recesses of the metal layer; and a width a of a bottom surface of at least one of the plurality of protrusions in the metal layer satisfies a&#x2266;2(x+y)/tan &#x3b8;, where a denotes the width of the bottom surface of each of the plurality of protrusions, x a thickness between the bottom surface and the upper surface, &#x3b8; a tilt angle of the slope with respect to the bottom surface, and y a total thickness of the insulating layer, the semiconductor layer and the reflective layer.

Growing community of inventors

Osaka, Japan

Mitsunori Imade