Video Signal Control Stabilizing Luminance During Scene Changes
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Solution Overview
Problem
Existing video signal control methods for self-luminous display panels, such as organic electroluminescence panels, cause unstable display luminance when only part of the screen changes, as they adjust luminance based on average luminance, leading to reduced response during scene changes.
Innovation Solution
A video signal control apparatus and method that detects average luminance for each frame and controls display luminance using the average luminance of a previous frame, replacing it with the current frame's luminance when the change exceeds a threshold, to balance image quality and power consumption, stabilizing the display during partial changes and responding to scene changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If display luminance is controlled based on average luminance of the current frame, then power consumption is restricted, but display luminance becomes unstable when only part of the screen changes
Solution Approach 1:
The patent uses the average luminance of the previous frame as a reference before controlling the display luminance of the current frame. This preliminary action allows the system to predict and maintain stable luminance levels, preventing unnecessary luminance changes when only partial screen content changes, thus stabilizing display while managing power consumption.
2Use of energy by stationary object
If display luminance is controlled based on average luminance of the current frame, then response to scene changes is reduced, but power consumption is restricted
Solution Approach 1:
The patent dynamically adjusts the control strategy by comparing the average luminance of the current frame with the previous frame. When significant changes are detected (indicating scene changes), the system responds quickly by updating display luminance accordingly. This dynamic approach maintains fast response to actual scene changes while still restricting power consumption during normal operation.
Data Source
AI summary
According to one embodiments a video signal control apparatus includes an average luminance detector and a display luminance controller. The average luminance detector detects the average luminance of a video signal with respect to each frame. The display luminance controller controls the display luminance of a first frame using the average luminance of a second frame prior to the first frame. When luminance change from the average luminance of the first frame to that of the second frame exceeds a predetermined threshold, the display luminance controller replaces the average luminance of the second frame with that of the first frame to control the display luminance of the first frame based on the average luminance of the first frame.