Backlight System Sub-Frame Intensity Control for Strip Pattern Reduction
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Solution Overview
Problem
Current display apparatuses face challenges in enhancing image quality due to limitations in light emission control, leading to issues like luminance unevenness and perception of strip-like patterns, especially when frame rates are increased beyond a certain threshold.
Innovation Solution
A backlight system and display apparatus that utilize a controller to manage light emission from multiple light-emitting devices with different average intensities in sub-frame periods, ensuring gradual changes in light emission to mimic a sine-wave grating pattern, thereby reducing the perception of strip-like patterns and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame rate is increased beyond a certain threshold, then productivity is improved, but object-affected harmful factors worsen due to luminance unevenness and strip-like pattern perception
Solution Approach 1:
The backlight is divided into multiple independently controllable light-emitting devices arranged in the scanning direction. Each light-emitting device can be controlled to emit light with different average intensities in different sub-frame periods, allowing segmented control of light emission to reduce luminance unevenness and strip-like patterns while maintaining high frame rates
Solution Approach 2:
Different regions of the backlight (different light-emitting devices) are assigned different light emission characteristics. Specifically, light-emitting devices emit light with different average intensities in different sub-frame periods, creating local variations in light emission that collectively reduce luminance unevenness and eliminate strip-like patterns across the display
2Device complexity
If light emission control is simplified, then device complexity is reduced, but manufacturing precision worsens due to inability to control average light emission intensities
Solution Approach 1:
The backlight operates using periodic sub-frame periods within each frame period. Light-emitting devices are controlled to emit light with different average intensities in different sub-frame periods, creating a time-based periodic control pattern that achieves precise luminance control without requiring complex spatial control mechanisms
Solution Approach 2:
The system dynamically adjusts the light emission intensity of different light-emitting devices based on their position in the scanning direction and the current sub-frame period. This dynamic control allows precise management of average light emission intensities while maintaining relatively simple device architecture
Data Source
AI summary
A backlight unit of the present disclosure includes: a backlight including a plurality of light-emitting devices that are allowed to emit light at mutually different timings and include a first light-emitting device and a second light-emitting device; and a controller that controls a light emission operation of the backlight to cause the first light-emitting device and the second light-emitting device to emit light with mutually different average light emission intensities in a first sub-frame period of a plurality of sub-frame periods provided corresponding to a frame period.