Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2002-04-15
2004-10-12
Wu, Xiao (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S099000, C345S100000, C345S103000, C345S215000, C348S087000, C348S115000, C349S039000, C349S042000, C349S054000
Reexamination Certificate
active
06803896
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an active matrix display device, specifically to an active matrix display device in which a plurality of retaining circuits is provided.
2. Description of the Related Art
There has been a great demand on the market for portable devices with a display such as a portable TV and a portable telephone. All these devices need a small, lightweight and low power consumption display device. Development efforts have been made accordingly. A liquid crystal display device having a static memory (Static Random Access Memory; SRAM) for each of the pixel elements for displaying a still picture is disclosed in Japanese Patent Application No. 2000-282168.
SUMMARY OF THE INVENTION
The invention provides an active matrix display device including a plurality of gate signal lines disposed in one direction on a substrate and a plurality of drain signal lines disposed in a direction different from the direction of the gate signal lines. The device also has a plurality of pixel element electrodes which are selected in response to a scanning signal fed from one of the gate signal lines and are provided with an image signal fed from one of the drain signal lines. A plurality of retaining circuits are disposed corresponding to the pixel element electrodes. Each of the retaining circuits retains a voltage according to the image signal. The device also has a voltage setting device setting a voltage of the gate signal line or a voltage of the drain signal line. The display device has a normal operation mode in which an analog image is formed based on the image signal and a memory operation mode in which a digital image is formed based on the voltages retained in the retaining circuits. The voltage setting device operates in the memory operation mode.
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Senda Michiru
Yokoyama Ryoichi
Abdulselam Abbas
Morrison & Foerster / LLP
Sanyo Electric Co., LTD
Wu Xiao
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