Hitachi, Ltd.

Hitachi Device Engineering Co., Ltd.

Other

Katsuhiko Shibata

Shiro Ueda

Naoto Kobayashi

Masumi Sasuga

Shigeru Nakamura

Akira Arimoto

Kenkichi Suzuki

Yoshio Toriyama

Yoichi Igarashi

Shunichi Kumaoka

Norihisa Fukayama

Atsushi Nemoto

The present invention provides a liquid crystal display device which is capable of suppressing wavy brightness irregularity which occurs in a display screen edge portion in the vicinity of drivers or tape carrier packages (TCPs) on which the drivers are mounted, owing to the mounting of the drivers or the TCPs. In one example of the present invention, a wavy pattern for preventing brightness irregularity is partially formed along one edge of a light guide plate in the vicinity of drivers mounted on a substrate which constitutes a liquid crystal display panel. Similar effects and advantages are obtained even if this wavy pattern for preventing brightness irregularity is formed on a reflecting sheet arranged on the side of the liquid guide plate opposite to the liquid crystal display panel, or on a diffusion sheet inserted between the light guide plate and the liquid crystal display panel.

LCD having a pattern for preventing a wavy brightness irregularity at the edges of the screen due to drive elements or tape carrier packages

To make it possible to prevent disconnection of the wiring on a driving multilayer flexible circuit board when folding the board, to reliably fold the circuit board, to improve the assemblability and the reliability or a backlight member, and to improve the noise resistance in a clip-chip-type liquid crystal display device using the circuit board, one end of a flexible substrate FPC2 is connected to an end of one transparent glass substrate SUB1 constituting a liquid crystal display element, the intermediate portion of the flexible substrate FPC2 is folded nearby the outside of an end side of the substrate SUB1, the other end of the substrate FPC2 is arranged at the lower side of an end of the substrate SUB1, and an end of a film BFI of the flexible substrate FPC2 is formed into a waved pattern along the folding line.

Liquid crystal display device assembled by flip chip technology

A liquid crystal device in which a peripheral circuit board positioned in the outer periphery of a seal port is recessed to avoid the projection of the seal port and in which a fluorescent tube has its two lamp cables arranged around the four sides of a crystal display element, so that the substrate at the seal port side and the lamp cable of a side light type back light can be packaged in compact.

Liquid crystal display device with reduced frame portion surrounding

A liquid crystal display device. The liquid crystal display device has a peripheral circuit including a liquid crystal display having drive ICs COG-packaged on a transparent substrate, and a foldable multi-layered flexible substrate having two or more conductor layers, so that the compact packaging can be realized to reduce EMI noise and the number of parts. The liquid crystal display device may also include a display controller having two or more display control integrated circuit elements packaged therein, and drive ICs mounted by a chip-on-glass packaging on two sides of a liquid crystal display panel, usually, on the longer sides, so that the display controller excellent in the temperature resistance and advantageous in compact and a video signal line driving circuit board are uniformly arranged at the upper and lower sides of a screen. As a result, the vertical positioning of the screen can be made proper to take an advantage in the compact packaging. Further, the liquid crystal display device may have a peripheral circuit board positioned in an outer periphery of a seal port recessed to avoid the projection of the seal port and in which a fluorescent tube has its two lamp cables arranged around four sides of a liquid crystal display element, so that the substrate at the seal port side and the lamp cable of a side light type back light can be compactly packaged.

Between the liquid crystal display panel and the backlight is arranged a prism sheet whose upper surface forms a prism surface and lower surface forms a smooth surface. The cross section of the prism surface is scalene triangles. Each of the scalene triangles is so shaped that if its base angles are taken to be .theta.1 and .theta.2, the relationship of 25 degrees.ltoreq..theta.1&lt;45 degrees and 45 degrees.ltoreq..theta.2&lt;90 degrees hold and that the prism surface on the base angle .theta.1 side faces in the direction of a wider viewing angle characteristic of the liquid crystal display panel. In this construction, because the emitted light can be converged in an optimum range of viewing angle of the liquid crystal display panel, it is possible to increase the brightness of the backlight with the same power consumption as used in the conventional apparatus and to reduce power consumption of the backlight.

Liquid crystal display device with a prism sheet that increases

A liquid crystal display device in which a back light is arranged below a liquid crystal display panel having a plurality of pixels arrayed on a transparent substrate surface and in which a prism plate having a plurality of stripe grooves arrayed in parallel is arranged between the liquid crystal display panel and the back light. If the stripe grooves has a pitch .lambda..sub.1 (mm) and if the pixels in parallel with the stripe grooves has a pitch .lambda..sub.2 (mm), the liquid crystal display device is constructed to satisfy a relation of .lambda..sub.1 .ltoreq.0.075.lambda..sub.2 /(.lambda..sub.2 +0.075). This construction can increase the brightness of the back light and prevent the interference fringes from being formed on the display frame.

Liquid crystal display device having a diffuser integrally formed with a

Liquid crystal display which suppresses interference fringes

An information indicator suitable for information processors such as personal computers, word processors and the like includes a light source, a scattering plate which scatters light from the light source, an indicator plate irradiated with scattered light from the scattering plate, and a prism plate operatively arranged with respect to the scattering plate and the indicator plate and having a prism-like protuberance structure formed at a side thereof. The prism plate is so disposed that the prism-like protuberance structure faces the scattering plate, and the angle 2.theta. constituting the prism-like protuberance structure is defined by the formula, 2.theta..ltoreq.2/3.times.(.pi./2+2.times.arcsin (n'/n)), in this inequality, n is the refractive index of said prism plate medium, and n' is the refractive index of a material in which the prism plate is arranged.

Prism plate for efficiently emitting light flux within a predetermined

An information indicator suitable for information processors such as personal computers, word processors and the like includes a light source, a scattering plate which scatters light from the light source, an indicator plate irradiated with scattered light from the scattering plate, and a prism plate operatively arranged with respect to the scattering plate and the indicator plate and having a prism-like protuberance structure formed at a side thereof. The prism plate is so disposed that the prism-like protuberance structure faces the scattering plate, and the angle 2.theta. constituting the prism-like protuberance structure is defined by the formula, 2.theta.&gt;2/3.times.(.pi./2+2.times.arcsin (n'/n)), in this inequality, n is the refractive index of said prism plate medium, and n' is the refractive index of a material in which the prism plate is arranged.

Growing community of inventors

Mobara, Japan

Katsuhiko Shibata