Display Panel Driving Unit Delay Compensation
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Solution Overview
Problem
The increased load and RC delay of gate lines in display devices lead to delayed activation of gate signals, resulting in decreased data charge rates and degraded display quality.
Innovation Solution
A driving method for display panels that involves applying reference image data to a data driving part, detecting time differences between reference data signals output through different channels, and adjusting data signal outputs based on these differences to compensate for gate line delays, thereby improving data charge rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If gate lines are extended to cover larger display areas, then display area is increased, but RC delay and load increase causing gate signal activation delay
Solution Approach 1:
The data driving part is divided into multiple data driving circuit parts, each responsible for specific data lines. Each circuit part independently measures its own channel delay characteristics and applies corresponding delay compensation, enabling localized optimization without requiring system-wide redesign.
Solution Approach 2:
Each data driving circuit part applies different delay compensation values specific to its channel characteristics. The delay compensation is customized for each circuit part based on its position and electrical characteristics, rather than using a uniform compensation approach across the entire display panel.
2Manufacturing precision
If gate line length is increased to expand display, then display resolution is improved, but data charge rate decreases due to RC delay
Solution Approach 1:
The system performs preliminary delay measurement using reference image data before actual display operation. The measured delay characteristics are stored and used for compensation during normal operation, allowing the system to pre-correct for the RC delay effects of long gate lines.
Solution Approach 2:
The system dynamically adjusts the delay compensation parameter for each data driving circuit part based on measured channel characteristics. By changing the delay parameter according to actual channel performance, the system optimizes data charge timing despite variations in gate line length and capacitance.
3Manufacturing precision
If more data lines are added to increase resolution, then display quality is improved, but channel delay variation increases
Solution Approach 1:
The system implements a feedback mechanism where reference image data is transmitted through each channel, the actual arrival time is measured, and the measured delay is used to adjust the timing of subsequent data signals. This closed-loop approach compensates for channel delay variations caused by the increased number of data lines.
Solution Approach 2:
Before normal display operation, the system performs preliminary characterization of each data channel by transmitting reference image data and measuring delay. These preliminary measurements establish the basis for timing compensation during actual operation, ensuring synchronized data arrival across all channels regardless of line count.
Data Source
AI summary
A driving unit of display panel includes a data driving part, a timing controlling part and a gate driving part. The data driving part is configured to receive reference image data and includes a first data driving circuit part having a first channel outputting a first reference data signal based on the reference image data and a k-th channel outputting a k-th reference data signal based on the reference image data. The timing controlling part is configured to detect a time difference between the first reference data signal and the k-th reference data signal. The gate driving part is configured to output a gate signal to each of gate lines. By delaying data signals based on the gate signal delay caused by long line load and RC delay, the present invention may improve display quality of a display device.