OLED Display Driving with Hybrid-Mode Pixel Compensation
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Solution Overview
Problem
Existing display technologies face challenges in accurately compensating for deviations in driving transistor characteristics across various types of organic light emitting displays, particularly in flexible and foldable formats, leading to inconsistent pixel luminance and reduced efficiency.
Innovation Solution
A display driving apparatus and method that senses transistor characteristics in a turn-off region and a turn-on region of a display panel, determining optimal compensation values based on image content type, and applying these values during a hybrid mode to maintain consistent luminance across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional compensation technology is applied to various types of organic light emitting display apparatuses, then sensing of driving transistor characteristics can be achieved, but efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by performing transistor characteristic sensing during the turn-off period before the display panel is fully activated. By conducting sensing operations in advance during the turn-off state, the system obtains compensation data without delaying the main display operation, thus maintaining high efficiency while achieving accurate measurement.
2Loss of time
If sensing is performed during turn-off region operation, then compensation time is reduced, but sensing coverage must be extended to full panel region
Solution Approach 1:
The patent implements universality by designing a sensing system that can operate across the entire display panel area during the turn-off state. The source driving circuit is configured to supply sensing signals to all pixel units simultaneously, enabling full-panel sensing coverage without requiring sequential scanning or multiple sensing cycles, thus reducing total compensation time while maintaining comprehensive measurement.
3Device complexity
If driving transistor characteristics are not compensated, then device complexity is reduced, but luminance consistency between pixels deteriorates
Solution Approach 1:
The patent applies feedback by using the sensed transistor characteristics to generate compensation values that are fed back to adjust the driving signals. The source driving circuit measures actual transistor parameters during turn-off, calculates appropriate compensation values, and applies these corrections to subsequent driving operations, thereby maintaining luminance consistency through closed-loop control.
Data Source
AI summary
A display driving apparatus includes a display panel comprising a first display area displaying a first image and a second display area being maintained in a turn-off state during a hybrid mode; a source driving circuit configured to supply a first source signal to first pixels included in the first display area and supply a second source signal to second pixels included in the second display area to sense electrical characteristics of the second pixels when the display panel operates in the hybrid mode; and a timing controller configured to transfer first image data for the first image and sensing data for sensing to the source driving circuit and compensate for second image data for a second image which is to be displayed after displaying of the first image, based on a target compensation value obtained from the electrical characteristics sensed by the source driving circuit, wherein the target compensation value is determined based on a third image displayed in a previous display mode of the hybrid mode.