Patent ID: 6515676
Filing Date: 2003-02-04
Classification: G09G

Abstract:
An analog interface liquid crystal display apparatus, comprising:a matrix display panel for being driven by X-directional signal lines and Y-directional signal lines; an X driver for supplying display data to said X-directional signal lines of said matrix display panel; a Y driver for sequentially supplying a selection voltage to said Y-directional signal lines of said matrix display panel in synchronism with a horizontal clock signal; an analog-to-digital (A/D) converter for converting input data in an analog form having a plurality of voltage levels into data in a digital form according to an adjustable reference voltage; data readout section for reading out said digital data at an arbitrary display position; a character information generating section for generating character information according to said readout data acquired by said readout section; an overlay display section for overlaying said character information over said digital data from said converter and displaying thereon an overlay image resultant from the overlaying operation; and a voltage generator for generating gradation voltage signals having a plurality of voltage levels, selecting one of said gradation voltage signals in response to an output from said-A/D converter, and supplying said selected gradation voltage signal to said X-directional signal lines.