Display Device Signal Controller for Luminance Stability
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Solution Overview
Problem
Display devices experience luminance fluctuations due to varying frame frequencies, leading to potential flickering and decreased image quality.
Innovation Solution
A display device and driving method that utilize a signal controller to output data and gate control signals at predetermined and variable frequencies, allowing for continuous display of previous and current frames without blank periods, thereby maintaining a consistent frame frequency and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame frequency is increased to improve display responsiveness, then the rendering speed is improved, but the luminance of the displayed image decreases
Solution Approach 1:
The patent implements dynamic frame frequency adjustment by the signal controller based on rendering time. When rendering time is short, the frame frequency is increased to improve responsiveness. When rendering time is long, the frame frequency is decreased to maintain luminance. This dynamic adjustment resolves the contradiction between rendering speed and luminance by adapting the frame frequency to current rendering conditions.
2Illumination intensity
If the frame frequency is decreased to maintain luminance, then the image brightness is maintained, but the display responsiveness deteriorates
Solution Approach 1:
The signal controller dynamically adjusts the frame frequency based on rendering time conditions. When rendering time is long, the frame frequency is decreased to maintain luminance. When rendering time is short, the frame frequency is increased to improve responsiveness. This dynamic behavior resolves the contradiction by optimizing both luminance and responsiveness according to real-time rendering conditions.
3Adaptability or versatility
If the frame frequency varies to adapt to rendering time, then the system adaptability is improved, but display quality deteriorates due to luminance fluctuation and flickering
Solution Approach 1:
The patent introduces a blank period as an intermediary element between frames with different luminance values. This blank period acts as a buffer that prevents direct transition between frames of different brightness levels, thereby eliminating luminance fluctuation and flickering. The signal controller manages this blank period to ensure smooth transitions while maintaining frame frequency adaptability, thus resolving the contradiction between adaptability and display quality.
4Reliability
If a blank period is inserted between frames to prevent luminance fluctuation, then display quality is improved, but the frame frequency is reduced
Solution Approach 1:
The patent applies blank periods selectively and partially - only between frames where luminance differences would cause flickering. The signal controller determines when blank periods are necessary based on the rendering time and luminance conditions. This partial application of blank periods improves display quality by preventing luminance fluctuation while minimizing the impact on frame frequency, thus resolving the contradiction between display quality and productivity.
Data Source
AI summary
A display device includes a display unit which includes pixels and gate lines and data lines connected to the pixels, a data driver connected to the data lines, and a signal controller which outputs a first frequency data control signal to the data driver at a predetermined frame frequency and outputs a second frequency data control signal to the data driver in synchronization with a vertical synchronization signal received from a graphics processing unit, wherein the data driver outputs a first data voltage to the data lines in accordance with the first frequency data control signal, and stops the output of the first data voltage and outputs a second data voltage to the data lines when the second frequency data control signal is inputted while outputting the first data voltage to the data lines.