Displays having processors for image data

Abstract

A display performing writing and reading operations in synchronization with different signals using a memory. Aphase locked loop circuit generates a write clock signal from a horizontal synchronization signal and transmits it to a write controller along with the horizontal synchronization signal. The write controller generates write control signals from the signals supplied by the PLL circuit to control writing of the image data into the memory. An oscillator generates a clock signal independent of the horizontal synchronization signal for the read controller. The read controller generates read control signals using the signals from the oscillator to output into the memory and a display panel, thereby controlling reading of the image data stored in the memory. The writing and the reading of the image data are performed in synchronization with independent signals to realize stable display.

Description

technical field [0001] The present invention relates to a display with an image data processor, and more particularly to a liquid crystal display (LCD) with a processor for storing an image data signal from an external device using a memory and transmitting the image signal to a display panel. Background technique [0002] Flat panel displays (FPDs) have increasingly been used instead of cathode ray tubes (CRTs), and among the FPDs, active matrix type LCDs having thin film transistors (TFTs) are widely used. [0003] When image data is stored in a memory and outputted to a display panel, reading and writing of data is generally synchronized with a clock signal having a phase synchronized with a horizontal synchronization signal or a vertical synchronization signal. Related techniques are disclosed by Shiki in US Patent No. 5,406,308. Shiki writes the image data into the frame memory synchronously with the clock signal TCK, the clock signal TCK is generated by the horizontal...

AI Technical Summary

Problems solved by technology

[0008] These deficiencies of conventional displays are more pronounced in LCDs where the charging time of the pixels is relatively short and the driving capability of the driver IC is limited.

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