Source Driver Load Resistance Compensation for Rollable Displays
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Solution Overview
Problem
Rollable display panels with small rolling diameters experience increased panel resistance due to repetitive rolling and unfolding, leading to image quality deterioration and reliability issues, especially in small devices where stress is greater.
Innovation Solution
A source driver system that includes a load resistance measuring unit, comparison unit, and output controller to measure and compensate the signal output based on changes in load resistance, ensuring consistent image quality across the display panel by adjusting the signal strength according to measured load resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a small rolling diameter is applied to reduce product thickness, then portability and aesthetics are improved, but panel resistance increases due to greater stress from repetitive rolling and unfolding
Solution Approach 1:
The source driver measures the load resistance of data lines before the rolling operation begins and stores this initial resistance value. This preliminary measurement allows the system to detect and compensate for resistance changes that occur during subsequent rolling and unfolding operations, preventing image quality deterioration before it becomes problematic.
Solution Approach 2:
The system continuously monitors the load resistance of data lines and compares it against the initial resistance value stored in memory. When resistance changes are detected, the source driver adjusts the output signal accordingly and stores the corrected resistance value for future operations. This feedback mechanism ensures consistent image quality despite changes in panel stress from rolling.
2Length of moving object
If a small rolling diameter is applied, then the product becomes thinner and more portable, but image quality deteriorates due to increased stress on the display panel
Solution Approach 1:
The source driver measures the load resistance of data lines before the rolling operation begins and stores this initial resistance value. This preliminary measurement allows the system to detect and compensate for resistance changes that occur during subsequent rolling and unfolding operations, preventing image quality deterioration before it becomes problematic.
Solution Approach 2:
The source driver dynamically adjusts the output signal parameters based on measured load resistance changes. By modifying the signal strength and characteristics in response to resistance variations caused by rolling stress, the system maintains consistent image quality across different operating conditions.
3Duration of action of moving object
If repetitive rolling and unfolding operations are accumulated, then the display panel can be rolled up and down multiple times, but the physical properties of the rolling region change causing resistance increase
Solution Approach 1:
The source driver measures the load resistance of data lines before the rolling operation begins and stores this initial resistance value. This preliminary measurement allows the system to detect and compensate for resistance changes that occur during subsequent rolling and unfolding operations, preventing image quality deterioration before it becomes problematic.
Solution Approach 2:
The system continuously monitors the load resistance of data lines and compares it against the initial resistance value stored in memory. When resistance changes are detected, the source driver adjusts the output signal accordingly and stores the corrected resistance value for future operations. This feedback mechanism ensures consistent image quality despite changes in panel stress from rolling.
Data Source
AI summary
A source driver for a display panel includes an output buffer configured to output a signal to a data line of the display panel; an output controller configured to control an output of the output buffer; a load resistance measuring unit configured to measure a load resistance of at least one data line of the display panel; and a comparison unit configured to compare the load resistance measured in the load resistance measuring unit with an initial load resistance, wherein the output controller is further configured to control a signal to be output by the output buffer based on the comparison result.