Matsushita Electric Industrial Co., Ltd.

Hitoshi Noda

Shigekazu Yamagishi

Hiroshi Miyai

Atsushi Hatakeyama

Mamoru Takeda

Hiroshi Takahara

Yoshito Miyatake

Takaaki Gyoten

Masahiro Kawashima

Junji Masumoto

Tetsuro Shiota

Hiroaki Sato

Yasuhiro Horio

An APL detection unit detects the APL for each unit field time period of an input video signal, and a light source control data production unit produces, depending on the results of the APL detection, a light source control signal at a minimum level which can stably drive a light source when the APL is 0% up to a predetermined value A1, a light source control signal at a maximum level which can stably drive the light source when the APL is a predetermined value A2 up to 100%, and a light source control signal which dynamically varies depending on the APL when the APL is between the predetermined value A1 and the predetermined value A2, to drive the light source on the basis of the light source control signal. As a result, it is possible to mitigate the lack of a contrast feeling and the occurrence of a floating blackness, as well as to improve the reliability of the light source.

Video display apparatus and video display method

A projection display system includes: two light sources ( ); a condenser ( ) for condensing the light from the light sources; a time-division color separating optical system ( ) for temporally switching the incident light into a first, second, or third color of light to be emitted; a light valve ( ) capable of modulating the incident light individually for each pixel; a lighting optical system ( ) for directing the light from the time-division color separating optical system onto the light valve, and a projection optical system ( ) for magnifying and projecting a pixel on the light valve. The light from the two light sources ( ) is condensed on the time-division color separating optical system or its vicinity by the condenser ( ), and then superimposed. This can provide a projection display system that performs time-division driving and can achieve high-brightness projection images without increasing the size and cost of a system.

Projection image display

An image display apparatus is provided for enlarging and projecting a light emitted from a plurality of self-emitting elements on a screen by beam scanning means, which is an image display apparatus having little or no luminance unevenness by solving the conventional problem of causing luminance unevenness in images projected on the screen due to a variance in luminance characteristics of each self-emitting element. It is configured such that a part of the light scanned on the screen from the beam scanning means is provided to a photodetector element that converts the intensity of the light into an electric signal so as to correct a driving signal to be supplied to the self-emitting element by the intensity of the light detected by this photodetector element.

Image display apparatus and method for compensating display image of image display apparatus

Belt-like regions illuminated by red, green and blue light beams are formed on an image display panel, and the illuminated regions are moved continuously. Each pixel of the image display panel is driven by a signal corresponding to the color of light entering the pixel. This makes it possible to display a color image with only one image display panel having neither a color filter nor a pixel exclusively for the respective light beams. The adjacent regions illuminated by two colors of light are overlapped partially, and the pixels in the overlapping portions are driven by a brightness signal component. By overlapping the adjacent illuminated regions, a focused area of the light beams can be enlarged, achieving a smaller focusing optical system, making it possible to reduce the size of the entire device.

Color image display device and projection-type image display apparatus

Three colors of light beams from a light source travel via a first optical system to strike a reflecting surface of a rotating polygon mirror, or mirrors, at different angles without overlapping. The rotating polygon mirror or mirrors reflect the light beams for scanning. The reflected light beams enter a second optical system at different angles to illuminate an image display panel at different portions. On the image display panel, belt-like regions illuminated by the light beams of individual colors are formed in parallel with each other, and these illuminated regions are moved continuously by scanning. A formed color image is magnified and projected by a projection optical system. With such a projection type image display apparatus, a display having high resolution and light efficiency that is also small, thin and inexpensive is achieved.

Color image display apparatus

In a projection type image display apparatus, the screen is divided and a memory to record luminance correction data corresponding to the divided regions is provided, and addresses of the divided regions of the screen are set by an address counter, synchronized with the input video signal. The luminance correction data are read successively by inputting the addresses to the memory, and luminance nonuniformity on the screen is corrected through operational processing of the correction value converted in an analog value by a D/A converter and the input video signal. The luminance correction data is obtained by computing measurement results of respective luminance characteristics of red, green, and blue colors on the screen and separately recorded as an amplitude correction component and a DC level correction component. By multiplying and adding the correction data to the input video signal respectively, nonuniformities in luminance and color from low luminance level to high luminance level can be precisely corrected. Also, as the read start position and read direction of the memory can be set corresponding to sweep direction of a projection type image display apparatus, the projection direction to the screen in a projection type image display apparatus can be easily changed without affecting the operation of luminance correction.

Projection type image display apparatus with circuit for correcting

The invention relates to a liquid crystal display device and a projection TV using same. The liquid crystal display device has microfine conductive bumps formed on terminals of a liquid crystal display panel, and a conductive joint layer formed on each conductive bump. The display panel is connected to wiring leads formed on a substrate provided thereon an IC drive circuit. The projection TV employs a liquid crystal display device in which three liquid crystal display panels corresponding to three colors, red, green, and blue, are mounted on a single substrate. Light beams are made incident on the respective panels, and light beams transmitted through or reflected from specified pixels are projected on a screen to form an image.

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Osaka, Japan

Hitoshi Noda