Timing Controller for Variable Refresh Rate Display Compensation
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Solution Overview
Problem
Organic light-emitting display devices are susceptible to degradation in display quality due to transistor characteristics and organic light-emitting element degradation, which existing technologies fail to address effectively.
Innovation Solution
A display device and compensation method that includes a timing controller to manage frame rates, active, blank, and sensing periods, allowing real-time sensing and compensation of subpixel driving transistors, thereby improving image quality and reducing memory allocation for data reset in variable refresh rate driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate is increased to improve display refresh speed, then the response time is reduced, but the blank period becomes insufficient for complete data reset
Solution Approach 1:
The patent implements dynamic adjustment of the sensing period duration based on the current frame rate. When operating at higher frame rates (e.g., 120Hz), the sensing period is shortened compared to lower frame rates (e.g., 60Hz). This dynamic adaptation allows the display device to maintain adequate data reset time in the blank period while achieving higher refresh speeds, resolving the contradiction between speed and time loss.
2Manufacturing precision
If real-time sensing and compensation of driving transistor characteristics is implemented to improve image quality, then display quality is enhanced, but device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the display device automatically performs sensing of driving transistor characteristics and generates compensation values without external intervention. The timing controller autonomously controls the sensing operation during the blank period, calculates compensation values based on sensed data, and applies these corrections to subsequent frame data. This self-service approach enhances image quality while minimizing the need for additional complex external control systems.
Solution Approach 2:
The patent performs sensing of driving transistor characteristics during the blank period before the next active display period begins. By conducting the sensing operation in advance during the available blank time, the system prepares compensation values that are ready to be applied immediately when the next frame data is supplied, ensuring continuous high-quality display without interrupting the active display period.
3Measurement precision
If the sensing period is extended to improve transistor characteristic measurement accuracy, then measurement precision is improved, but the active period is reduced
Solution Approach 1:
The patent implements periodic sensing operations that occur at regular intervals during the blank period rather than continuously during the active period. The sensing is performed in discrete sensing periods within the blank period, allowing adequate time for accurate measurement of driving transistor characteristics without encroaching on the active display period. This periodic approach during the blank period resolves the contradiction between measurement precision and active period duration.
Data Source
AI summary
A display device may include: a display panel with subpixels connected respectively to scan lines, sensing lines, and data lines; a gate driver configured to supply a scan signal to the scan lines during an active period and to supply a sensing signal to the sensing lines during a sensing period of a blank period; a data driver configured to supply a data voltage to the data lines; and a timing controller configured to control the gate and data drivers. The timing controller may determine the active period, blank period, and sensing period to be, respectively: a first active period, a first blank period, and a first sensing period for operating at the first frame rate; and a second active period, a second blank period, and a second sensing period for operating at the second frame rate. The first sensing period and the second sensing period have a same length.