Display Device Dynamic Emission Off Period Control
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Solution Overview
Problem
Existing display devices struggle to maintain optimal image quality across various operating frequencies, leading to luminance degradation and potential flicker recognition at lower frequencies.
Innovation Solution
The display device incorporates a light emitting element and transistors with a gate electrode receiving an emission signal, allowing for adjustable emission off periods within a frame to compensate for different operating frequencies. A driving controller generates emission control signals based on synchronization signals, adjusting the emission off periods to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the emission off period is fixed, then the device structure is simple, but luminance degradation and flicker occur at lower operating frequencies
Solution Approach 1:
The emission off period is made dynamic rather than fixed, allowing it to be adjusted based on the operating frequency. The controller varies the emission off period duration according to the detected input image signal frequency, enabling the display device to adapt to different operating frequencies while maintaining optimal luminance and preventing flicker.
Solution Approach 2:
The patent changes the parameter of emission off period duration based on operating frequency. By detecting the input image signal frequency and adjusting the emission off period accordingly, the system optimizes performance across different frequency ranges without requiring a complete redesign of the emission control structure.
2Stability of the object's composition
If the emission off period is extended, then luminance uniformity improves, but the time available for other operations decreases
Solution Approach 1:
The emission off period is dynamically adjusted based on operating frequency rather than being extended uniformly. At lower frequencies where luminance uniformity is more critical, the emission off period is extended. At higher frequencies where time is more constrained, the emission off period is shortened, optimizing the balance between luminance uniformity and time availability.
Data Source
AI summary
A display device includes a light emitting element, a first transistor, and a second transistor connected between the first transistor and the light emitting element and including a gate electrode which receives an emission signal. One frame includes a first period a second period continuous with the first period. An emission off period of the emission signal has a first time duration during the first period, and the emission off period of the emission signal has a second time duration different from the first time duration during the second period.