Data Driving Circuit Offset Control for Display Grayscale Accuracy
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Solution Overview
Problem
Existing display devices face challenges in enhancing the display quality of low grayscale images due to offset voltages in amplifiers, leading to visible bright or dark lines that deteriorate image clarity.
Innovation Solution
A data driving circuit with an offset control circuit that alternates the phase of offset voltages in response to input control signals, compensating for amplifier offset voltages by connecting input terminals differently based on signal logic levels to adjust output voltages and improve grayscale accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If amplifier offset voltage is present, then the amplifier can operate with simple structure, but the display quality of low grayscale images deteriorates due to visible bright or dark lines
Solution Approach 1:
The patent applies periodic action by alternately inverting the offset voltage phase between different pixel rows. The offset control circuit switches the phase of offset voltage based on row timing signals, causing adjacent rows to have opposite offset phases. This periodic inversion prevents the accumulation of offset errors in the same direction, thereby reducing visible bright or dark lines while maintaining simple amplifier structure.
2Manufacturing precision
If offset voltage compensation is implemented, then grayscale accuracy is improved, but the circuit complexity increases due to additional control circuits
Solution Approach 1:
The patent implements local quality by applying offset voltage compensation selectively to specific circuit nodes rather than the entire amplifier. The offset control circuit is designed to inject compensation voltages only at the input terminals of the amplifier, leaving the rest of the amplifier structure unchanged. This localized approach achieves grayscale accuracy improvement with minimal increase in overall circuit complexity.
Solution Approach 2:
The patent uses an offset control circuit as an intermediary component that mediates between the simple amplifier structure and the requirement for grayscale accuracy. This intermediary circuit generates and injects compensation voltages that cancel out offset effects, allowing the main amplifier to remain simple while still achieving accurate grayscale representation.
3Manufacturing precision
If offset voltage is inverted for all pixels, then grayscale accuracy improves, but the circuit becomes more complex and power consumption increases
Solution Approach 1:
The patent divides the display into multiple pixel rows and applies offset inversion selectively to alternate rows rather than all pixels simultaneously. This segmentation allows the offset compensation to be distributed across different time periods, reducing the instantaneous power consumption and avoiding the need to invert offsets for all pixels at once, thereby lowering overall power consumption while maintaining grayscale accuracy.
Data Source
AI summary
A data driving circuit is disclosed that includes an amplifier and an offset control circuit. The amplifier has an offset voltage and is configured to output a data voltage reflecting the offset voltage. The offset control circuit is configured to control, in response to an input control signal, the amplifier to output the data voltage reflecting the offset voltage in a positive direction or a negative direction. The data driving circuit may enhance the display quality of a low grayscale image.