LCD Data Line Driver Circuit With Parallel D/A Correction
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Solution Overview
Problem
Existing liquid crystal display driver circuits face challenges in achieving high-quality image display due to display non-uniformity issues, such as luminance and color non-uniformity, which current correction methods cannot adequately address without increasing circuit complexity and power consumption.
Innovation Solution
The integration of a plurality of data line driver circuits, first and second correction D/A conversion circuits, operational amplifiers, input capacitors, and correction capacitors, which receive image data and correction data to output corrected data signals, allowing for regular voltage step correction without the need for gamma correction calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grayscale voltage corresponding to gamma characteristics is used for D/A conversion, then image data can be corrected by irregular voltage values, but circuit complexity and power consumption increase due to required gamma correction calculations
Solution Approach 1:
The correction function is segmented into two independent D/A conversion circuits: one for regular grayscale voltage and another for correction voltage. This allows the correction function to be separated from the main image data processing path, eliminating the need for complex gamma correction calculations in a single circuit while maintaining image quality.
Solution Approach 2:
The correction D/A conversion circuit can apply different correction voltages for various display non-uniformity issues (luminance non-uniformity, color non-uniformity, etc.), making it a universal correction mechanism that handles multiple image quality problems without requiring separate complex processing circuits for each issue.
2Ease of manufacture
If regular grayscale voltage is used for D/A conversion, then image data can be corrected by regular voltage values, but calculation processes are required to perform gamma correction
Solution Approach 1:
Correction voltages are prepared in advance through D/A conversion from correction data, and these pre-prepared correction voltages are then simply added to the main signal. This preliminary preparation eliminates the need for real-time gamma correction calculations during image processing, improving processing efficiency.
Solution Approach 2:
The correction D/A conversion circuit acts as an intermediary that converts digital correction data into analog correction voltages, which are then combined with the main image signal. This intermediary approach simplifies the overall processing by separating the correction function from the main processing path.
3Manufacturing precision
If correction circuits are added to correct display non-uniformity, then image quality improves, but circuit scale increases
Solution Approach 1:
The correction function is merged with the existing D/A conversion structure by adding a parallel correction D/A conversion circuit. Both the main image data and correction data go through similar conversion processes and are combined at the output, allowing correction functionality to be integrated without requiring entirely separate correction circuits.
Solution Approach 2:
The correction D/A conversion circuit serves multiple correction purposes (luminance uniformity, color uniformity, etc.), making it a multi-functional component that provides comprehensive display uniformity correction without requiring separate dedicated circuits for each type of non-uniformity correction.
Data Source
AI summary
An integrated circuit device includes a plurality of data line driver circuits, a first correction D/A conversion circuit, and a plurality of D/A conversion circuits. Each of the data line driver circuits includes an operational amplifier, an input capacitor, and a first correction capacitor. Each of the D/A conversion circuits outputs an output signal to the input capacitor. The first correction D/A conversion circuit outputs a correction output voltage to the first correction capacitors to correct data signals output from the data line driver circuits.