Timing Controller Built-In Picture for OLED Sensing Compensation
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Solution Overview
Problem
In OLED display panels, characteristic drift due to current stress, temperature, and illumination leads to residual images, requiring TFT compensation to eliminate these issues, but existing sensing compensation methods are prone to errors from unstable video signals, causing abnormal displays or incorrect voltage sensing.
Innovation Solution
A timing controller with a sensing module, built-in picture generation module, and multi-channel data selection module generates a stable video signal for sensing compensation, switching from display mode to built-in picture mode to ensure accurate compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel uses existing sensing compensation methods with external video signals, then the compensation function can be implemented, but the video signal stability is poor leading to sensing errors and abnormal displays
Solution Approach 1:
The patent introduces a built-in picture generation module as an intermediary component that generates stable test patterns internally within the timing controller. This built-in picture serves as a reliable mediator for sensing compensation operations, replacing the unstable external video signals and eliminating the source of sensing errors while maintaining the compensation functionality.
Solution Approach 2:
The timing controller creates an internal copy of video signal generation capability through the built-in picture generation module. This copy allows the system to produce stable test patterns independently without relying on external video sources, ensuring signal stability during sensing compensation operations and preventing the measurement precision issues caused by external signal instability.
2Reliability
If the timing controller switches to built-in picture mode for sensing compensation, then video signal stability is improved, but the system complexity increases due to additional modules
Solution Approach 1:
The patent merges the picture generation functionality directly into the timing controller, combining multiple functions (video signal processing and test pattern generation) into a single integrated device. This merging approach improves video signal stability for sensing operations while avoiding the need for separate external video generation equipment, thus limiting the increase in overall system complexity.
Solution Approach 2:
The timing controller is designed with multi-functionality, serving both as a video signal processor for normal display operations and as a built-in picture generator for sensing compensation operations. This universal design allows the same device to handle different functions (display and sensing) without requiring entirely separate systems, balancing the added complexity with functional consolidation.
3Adaptability or versatility
If the multi-channel data selection module switches modes, then the appropriate video source is selected for sensing compensation, but the switching process may cause display instability
Solution Approach 1:
The multi-channel data selection module implements dynamic switching capability that allows the system to adaptively select between different video sources (external display mode and built-in picture mode) based on operational requirements. This dynamic switching enables the system to transition smoothly between normal display operations and sensing compensation operations, maintaining display stability while providing the versatility needed for different functional states.
Data Source
AI summary
Provided are a timing controller, sensing compensation method thereof, and display panel. The timing controller includes a sensing module (501), a built-in picture generation module (502), a multi-channel data selection module (503) and a processing output module (504). The sensing module is configured to sense whether a sensing compensation instruction is received, when received, notify built-in picture generation module and multi-channel data selection module; built-in picture generation module is configured to receive a notification and generate a first video signal; multi-channel data selection module is configured to receive a notification, switch from a display mode to a built-in picture mode, select first video signal as a video source, output first video signal to processing output module; processing output module is configured to process first video signal and output processed first video signal to the display panel so that the display panel performs sensing compensation based on the first video signal.