Integrated Circuit Data Voltage Correction for Display Uniformity
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Solution Overview
Problem
High-definition liquid crystal display equipment faces challenges in accurately outputting data voltages due to manufacturing-derived differences and changes caused by heat, leading to image quality deterioration, as existing methods either take too long to reach desired grayscale voltages or fail to accommodate post-manufacturing changes in panel characteristics.
Innovation Solution
An integrated circuit device with data line driving circuits, a comparator, and a correction data calculation section that compares data voltages with a reference voltage, calculates correction data, and adjusts image data in real-time to ensure accurate and consistent output, even when panel characteristics change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DAC outputs are used to drive data voltage supply lines to prevent voltage differences, then data voltage accuracy is improved, but the driving speed becomes too slow to meet high-definition display requirements
Solution Approach 1:
The patent divides the correction function into two parts: (1) operation amplifiers handle high-speed driving with high output impedance, and (2) DAC outputs handle precision voltage generation. This segmentation allows each component to optimize for its specific function, resolving the contradiction between speed and accuracy.
Solution Approach 2:
The patent introduces an intermediary correction circuit that receives correction data from the comparator and adjusts the operation amplifier outputs. This intermediary component bridges the gap between the fast but inaccurate operation amplifiers and the accurate but slow DAC outputs.
2Manufacturing precision
If correction data adjusted at manufacturing time is used, then initial display uniformity is achieved, but post-manufacturing changes in panel characteristics cannot be accommodated
Solution Approach 1:
The patent implements a feedback mechanism where the comparator continuously monitors data voltages from each data line driving circuit and generates real-time correction data. This feedback loop allows the system to automatically adjust for panel characteristic changes during operation, maintaining display uniformity throughout the product lifecycle.
Solution Approach 2:
The correction data is made dynamic rather than static. The system continuously updates correction values based on actual measured voltages, allowing adaptation to changing conditions such as temperature variations and panel aging, rather than relying on fixed manufacturing-time corrections.
3Measurement precision
If multiple correction circuits are added to correct data voltages in real-time, then image quality is improved, but device complexity increases
Solution Approach 1:
The operation amplifiers serve multiple functions: they provide high-speed driving capability and also serve as the basis for the feedback correction mechanism. The data line driving circuits simultaneously perform driving and self-diagnosis functions by feeding back their output voltages to the comparator.
Solution Approach 2:
The patent merges the correction functionality into the existing data line driving circuit architecture. The comparator and correction data calculation section are integrated with the driving circuits, and correction is applied through the same data lines, avoiding the need for completely separate correction circuits.
Data Source
AI summary
An integrated circuit device includes: a plurality of data line driving circuits that drive a plurality of data voltage supply lines; a comparator that compares a data voltage corresponding to a data line driving circuit to be corrected among the plurality of data line driving circuits with a comparator reference voltage; a correction data calculation section that calculates correction data for correcting a difference in the data voltage based on a comparison result given from the comparator; and a plurality of correction circuits that each correct image data based on the correction data given from the correction data calculation section, and output the image data after correction processing to a corresponding data line driving circuit among the plurality of data line driving circuits.