OLED Driving Controller Frequency Adaptation for Flicker and Sticking
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Solution Overview
Problem
Low frequency driving methods in OLED display devices can result in sticking images due to the response speed of pixels, and rapid luminance changes can cause flicker issues during image transitions.
Innovation Solution
A display device and driving method that output data signals at driving frequencies higher than the predetermined low frequency during image transition periods, either sequentially or non-sequentially, to improve pixel response speed and reduce flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low frequency driving mode is used to decrease power consumption, then power consumption is reduced, but sticking images are generated due to slow pixel response speed
Solution Approach 1:
The patent applies dynamics by making the driving frequency adjustable rather than fixed. The driving controller dynamically changes the driving frequency based on whether an image transition is detected. During image transitions, the frequency is increased to ensure proper pixel response, while during static images, the frequency is reduced to save power. This dynamic adaptation resolves the contradiction between power consumption and display quality.
Solution Approach 2:
The patent changes the driving frequency parameter based on image transition detection. When an image transition is detected, the driving frequency is changed from a low frequency to a higher frequency to ensure pixels can respond properly to the image change, preventing sticking images. This parameter change allows the system to maintain display quality during transitions while preserving low power consumption during static periods.
2Use of energy by moving object
If low frequency driving mode is used, then power consumption is reduced, but flicker issues occur during image transitions due to rapid luminance changes
Solution Approach 1:
The driving controller dynamically adjusts the driving frequency based on image transition detection. During image transitions, the frequency is increased to a higher frequency that prevents flicker by ensuring smooth luminance changes. During static image periods, the frequency is reduced to low frequency to minimize power consumption. This dynamic frequency adjustment resolves the contradiction between power consumption and flicker prevention.
Solution Approach 2:
The patent changes the driving frequency parameter conditionally based on whether an image transition is detected. When a transition is detected, the frequency parameter is changed from low to high to prevent flicker. This parameter change strategy allows the system to eliminate flicker during transitions while maintaining low power consumption during stable display periods.
3Reliability
If image transition is detected in low frequency driving mode, then display quality can be improved by changing frequency, but device complexity increases due to frequency switching control
Solution Approach 1:
The driving controller performs preliminary detection of image transitions before executing frequency changes. By detecting whether an image transition has occurred and then conditionally changing the driving frequency only when necessary, the system avoids unnecessary complexity while ensuring display quality during transitions. This preliminary detection approach simplifies the control logic compared to continuously varying frequency.
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; and a driving controller configured to: generate a data signal corresponding to an input image data; generate a data voltage based on the data signal; and output the data voltage to the pixels, wherein the driving controller is configured to output the data signal in at least one driving frequency higher than a predetermined low frequency during an image transition period in a low frequency driving mode during which the data signal outputs in the low frequency.