Method and apparatus for driving STN LCD
AssigneeLeadis Technology, Inc.
InventorsTae-Kwang Park, Kenunmyung Lee
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Abstract
A driver for driving an STN LCD is disclosed. A preferred embodiment comprises a 3-line output display data for storing display data, an XOR block for finding mismatches between each 3-line output set of the stored display and orthogonal function signals, a decoder block for calculating mismatch numbers, a level shifter block for shifting the data level of the mismatch numbers to another level, and a voltage selector block for selecting a voltage level from 2 levels of voltage. Because data latches and output latches are not necessary, the driver of the present invention achieves significant reduction in the circuit components and chip size without compromising the display quality.
Claims32
A method for driving an LCD panel consisting of scan lines and column lines arranged in rows and columns respectively, comprising the steps of:
- storing data to be displayed on the LCD panel in a display data memory;
- partitioning the scan lines into a plurality of scan blocks, each scan block containing m number of scan lines;
- sequentially selecting each scan block, activating multiple scan lines within the scan block;
- concurrently outputting from the display data memory m number of display data items to be displayed in adjacent rows along the same column on the LCD panel;
- and
- generating a column signal that would produce a display on the LCD panel according to the display data when multiple rows are selected.
A driver for driving an LCD panel consisting of scan lines and column lines arranged in rows and columns respectively, comprising:
- a display data memory having rows and columns of cells for storing display data partitioned into blocks of m number of scan lines and for concurrently outputting m number of data items be displayed in a selected block of scan lines and a selected column line;
- and
- a column signal circuit for calculating column signals that generates the same display by selecting multiple rows.
A liquid crystal display, comprising:
- a LCD panel consisting of scan lines and column lines arranged in rows and columns respectively,
- a row driver for selecting scan lines;
- and
- a column driver for driving column lines comprising:
- a display data memory having rows and columns of cells for storing display data partitioned into blocks of m number of scan lines and for concurrently outputting m number of data items be displayed in a selected block of scan lines and a selected column line;
- and
- a column signal circuit for calculating column signals that generates the same display by selecting multiple rows.
Dependencies are inferred from the claim text.