Liquid crystal driving devices
AssigneeSharp Kabushiki Kaisha
InventorsShunichi Murahashi, Masafumi Katsutani
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Abstract
A liquid crystal driving device of the present invention is provided with a display data memory of a capacity that can be divided into two parts, and a switch circuit that is used to switch an addressing method of the display data memory between multi-tone display in a dual-scan and simple-tone display in a single-scan, so as to enable a driving IC to be shared between liquid crystal display devices that are used to display high-quality and multi-tone images and liquid crystal display devices that require less tone. Such a liquid crystal driving device can be used to reduce production cost of various types of liquid crystal display devices.
Claims6
A liquid crystal driving device, comprising:
- a matrix-type liquid crystal display panel, having pixels that are disposed in row and column directions in a matrix, for displaying 2k tones (k being a natural number);
- a display memory, which stores display data to be supplied to said matrix-type liquid crystal panel;
- a column driver of m outputs (m being a natural number);
- a row driver of n outputs (n being a natural number);
- display memory control means for varying a value n and a value k of m×n×k bits, which is a capacity of said display memory, while holding n×k bits of m×n×k bits constant;
- and
- output number setting means for setting a number of outputs of said row driver such that the n value varied by said display memory control means becomes the number of outputs of said row driver.
A liquid display driving device, comprising:
- a matrix-type liquid crystal display panel having pixels that are disposed in row and column directions in a matrix;
- a display memory, which stores display data to be supplied to said matrix-type liquid crystal display panel;
- row and column drivers for driving said matrix-type liquid crystal display panel;
- and
- setting means for setting a count of addresses of a display data storing area of said display memory, so as to set a number of outputs of said row driver according to the count,
- wherein said setting means varies the count of addresses between a dual-scan display mode in which two parts of a display screen of said matrix-type liquid crystal display panel, that has been divided into two parts in a row direction, are simultaneously driven to carry out display, and a single-scan display mode in which the display screen of said matrix-type liquid crystal display panel is directly driven to carry out display.
Dependencies are inferred from the claim text.