Display Device Frame Frequency Adaptability Luminance Consistency
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Solution Overview
Problem
Display devices experience differences in luminance when operating at varying frame frequencies, leading to inconsistencies in image quality due to differences in blank periods and frame periods.
Innovation Solution
A display device with a timing controller that adjusts the driving frame frequency and includes a blank period with initialization periods to synchronize with input frame frequencies, ensuring consistent luminance across different frame frequencies by generating additional luminance valleys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frame frequency is varied to respond to rapid screen switching in gaming displays, then the response speed to different frame rates is improved, but luminance inconsistency arises between low and high frame frequencies
Solution Approach 1:
The patent applies periodic action by introducing multiple initialization periods within the blank period at lower frame frequencies. The blank period is divided into several initialization periods (e.g., first, second, third initialization periods) that periodically reset the light-emitting elements to a reference luminance state. This periodic initialization ensures that regardless of the frame frequency, the luminance valleys are consistently generated, thereby resolving the luminance inconsistency between different frame rates while maintaining frame frequency adaptability.
2Loss of time
If the blank period is extended at lower frame frequencies to maintain timing synchronization, then the frame timing accuracy is improved, but the luminance difference between low and high frame frequency images worsens
Solution Approach 1:
The patent applies segmentation by dividing the blank period into multiple distinct initialization periods. Instead of using a single extended blank period, the blank period is segmented into first, second, and third initialization periods, each serving to reset the luminance of light-emitting elements. This segmentation allows the system to maintain proper frame timing synchronization at lower frame frequencies while actively managing and reducing luminance differences through multiple controlled initialization events throughout the extended blank period.
Data Source
AI summary
A display device includes: a display panel including pixels having light-emitting elements; a timing control unit for variably changing the driving frame frequency of the display panel according to the input frame frequency of digital video data; and a data driving unit for outputting data voltages according to the digital video data, wherein the display panel operates at a first frame frequency for a first frame period and operates at a second frame frequency, which is lower than the first frame frequency, for a second frame period, the second frame period includes a data addressing period in which a data voltage corresponding to each of the pixels is applied to the pixels, and a blank period in which no data voltage is applied to each of the pixels, and the blank period includes a period of initializing a first electrode of a light-emitting element into an initialization voltage.