Data Driving Circuit Overdrive Compensation for Display RC Delay
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Solution Overview
Problem
Display devices experience driving abnormalities such as abnormal black expression, increased stain level, and color variation due to RC delay, which increases with panel size and resolution, leading to luminance variation and inefficiencies.
Innovation Solution
A data driving circuit that reduces data settling time through data overdriving compensation, compensates for voltage changes due to RC delay, and optimizes the structure to share gate control signals among adjacent subpixels, using a data compensation circuit to update digital data based on comparisons between adjacent subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the panel size and resolution are increased, then the display quality is improved, but the RC delay increases causing driving abnormalities
Solution Approach 1:
The patent applies preliminary action by performing overdriving compensation before the actual data writing process. The compensation circuit pre-adjusts the data voltage based on predicted RC delay characteristics, ensuring that even though the panel size and resolution are increased, the driving abnormalities are prevented in advance rather than corrected after they occur.
Solution Approach 2:
The patent implements feedback through a compensation circuit that monitors and adjusts data voltages based on RC delay characteristics. The circuit uses feedback from the actual voltage levels and timing information to dynamically compensate for RC delay variations, maintaining driving stability despite increased panel size and resolution.
2Productivity
If the data settling time is reduced through overdriving compensation, then the productivity is improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by using overdriving compensation selectively and partially. Instead of continuously applying excessive overdriving voltage, the compensation is applied only when and where RC delay exceeds threshold values, reducing the overall power consumption while still achieving improved data settling speed in critical regions.
Solution Approach 2:
The patent changes the voltage parameter dynamically through overdriving compensation. By adjusting the data voltage level based on RC delay characteristics and timing, the system achieves faster settling speed when needed while returning to normal voltage levels otherwise, thereby balancing productivity improvement with power consumption management.
3Device complexity
If the gate driving circuit structure is optimized to share control signals, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies merging by combining multiple gate control signals into shared control signal lines. Adjacent subpixels that require similar timing are grouped together and controlled by the same gate signal, reducing the total number of control lines and simplifying the gate driving circuit structure while maintaining proper timing through careful signal distribution design.
Data Source
AI summary
A data driving circuit, a display device and a method are discussed, which are capable of reducing data settling time and preventing or reducing brightness fluctuation by providing a data voltage to which overdriving compensation is applied based on the comparison result of digital data voltages. The data driving circuit can include a latch circuit configured to store first digital data of an n-th subpixel connected to an n-th gate line according to a sampling signal, a line buffer configured to store second digital data of an n−1-th subpixel connected to an n−1-th gate line, and a data compensation circuit configured to compare the first digital data of the n-th subpixel with the second digital data of the n−1-th subpixel to update second digital data of the n-th subpixel in the line buffer.