OLED Display Light Emission Control for Flicker and Blur
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Solution Overview
Problem
Current organic light emitting display devices face challenges in maintaining display quality, particularly when used in wearable devices like HMDs, where still images and moving images require different light emission control to minimize flicker and motion blur phenomena.
Innovation Solution
The organic light emitting display device employs a dual-mode operation, adjusting the number and width of light emission control signals for still and moving images, ensuring equal total light emission time across both image types, and utilizing a timing controller to manage gamma voltages and offset values for uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of light emission control signals is increased for still images, then flicker phenomenon is minimized, but the device complexity increases
Solution Approach 1:
The display device dynamically adjusts the number of light emission control signals based on the image type (still or moving). For still images, k light emission control signals are supplied where k≥2 to minimize flicker, while for moving images, only j light emission control signals are supplied where j<k. This dynamic adaptation resolves the contradiction by optimizing display quality for each image type without permanently increasing device complexity.
Solution Approach 2:
The patent changes the parameter of light emission control signal quantity based on image type. By setting different values for k (still image) and j (moving image), the system achieves minimal flicker for still images while maintaining manageable complexity through conditional parameter adjustment rather than fixed high-complexity control.
2Reliability
If different light emission control is applied to still and moving images, then display quality is improved, but the ease of operation decreases
Solution Approach 1:
The display device automatically determines whether the displayed image is still or moving and autonomously adjusts the number of light emission control signals accordingly. This self-service mechanism improves display quality without requiring user intervention or complex manual control, as the system self-adjusts based on image characteristics.
Solution Approach 2:
The control system dynamically adapts to image type changes and automatically adjusts signaling parameters. This dynamic operation maintains ease of use because the adjustment happens automatically without user input, while still achieving improved display quality through differentiated control for still and moving images.
3Stability of the object's composition
If total light emission time is equalized for still and moving images, then brightness uniformity is improved, but the productivity decreases
Solution Approach 1:
The patent employs periodic light emission control signals with different frequencies for still and moving images. By supplying k periodic signals for still images and j periodic signals for moving images (where j<k), the system achieves brightness uniformity through equalized total light emission time while maintaining different refresh characteristics appropriate for each image type, thus balancing stability with productivity.
Data Source
AI summary
An organic light emitting display device comprises a first pixel region including first pixels which are driven in response to data signals when the organic light emitting display device is driven in a first mode and a second mode; a first scan driver which supplies scan signals to first scan lines connected to the first pixels; and a first light emitting driver which supplies light emission control signals to first light emission control lines which are connected to the first pixels. During one frame period in the second mode, the first light emitting driver supplies K light emission control signals to each of the first light emission control lines when a still image is displayed in the first pixel region, and supplies J light emission control signals to each of the light emission control lines when a moving image is displayed in the first pixel region.