OLED Display Driving with Hybrid Sensing for Luminance Compensation
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in maintaining consistent luminance due to degradation of driving transistor characteristics over time, particularly in flexible and foldable displays, where conventional compensation technologies are inefficient and difficult to apply.
Innovation Solution
A display driving apparatus and method that senses the characteristics of driving transistors in a turn-off region and uses this data to determine an optimal compensation value for the entire display panel, adjusting image data based on the sensed values to maintain consistent luminance across the panel, especially in hybrid mode operations where one area displays images and another area senses transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional compensation technology is applied to sense driving transistor characteristics, then luminance deviation between pixels can be compensated, but it is difficult to apply to various types of organic light emitting display apparatuses such as foldable, rollable, stretchable displays, and digital cockpit displays
Solution Approach 1:
The display panel is divided into a first display area for image display and a second display area for transistor characteristic sensing. This segmentation allows the sensing function to be integrated into the display structure without requiring separate sensing hardware, enabling application across various display types including foldable, rollable, stretchable displays, and digital cockpit displays while maintaining compensation effectiveness.
Solution Approach 2:
The second display area serves dual functions: it can display images when needed and function as a sensing region for measuring driving transistor characteristics. This multi-functionality allows the same display structure to serve both display and sensing purposes across different display apparatus types, improving adaptability while maintaining reliable compensation through the sensing capability.
2Measurement precision
If the entire display panel is used for sensing to obtain full region compensation values, then compensation accuracy is improved, but the display area available for image display is reduced
Solution Approach 1:
Only a specific second display area is dedicated for sensing operations while the first display area maintains full image display capability. This local sensing approach provides sufficient compensation accuracy by measuring transistor characteristics in the second area, which can then be applied to compensate the entire display panel, thus maintaining display area while achieving effective compensation.
Solution Approach 2:
Sensing is performed in a partial region (second display area) rather than the entire panel, which is sufficient to obtain representative transistor characteristic data for compensation. This partial sensing action provides adequate measurement precision without sacrificing display area, as the compensation values derived from the second area can be applied globally across the full display panel.
3Illumination intensity
If sensing is performed during turn-off state to avoid image display interference, then display quality is maintained, but sensing time and efficiency are reduced
Solution Approach 1:
Transistor characteristic sensing is performed in advance during the turn-off state or blanking period before image display begins. This preliminary sensing action obtains compensation values that can be applied to the subsequent image display, ensuring display brightness quality is maintained while utilizing otherwise idle time for sensing operations, thus minimizing impact on overall system performance.
Solution Approach 2:
The display operates in periodic cycles alternating between sensing mode (turn-off state) and display mode. During each sensing period, transistor characteristics are measured in the second display area; during display periods, images are shown in the first display area using compensation values from previous sensing. This periodic alternation maintains display quality while efficiently utilizing time for both sensing and display functions.
Data Source
AI summary
A display driving apparatus includes a source driving circuit supplying a first source signal to a first display area to display a first image and supply a second source signal to a second display area to sense characteristics of a pixels of the second display area when a display panel operates in a hybrid mode, the second display area being in a turn-off state during the hybrid mode, a gate driving circuit supplying a gate pulse to first gate lines of the first display area and supply the gate pulse to target gate lines of the second display area, a timing controller transferring 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 the first image, based on a target compensation value obtained from a sensing result.