Adaptive Gray Frame Insertion for Display Brightness Control
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Solution Overview
Problem
Display devices struggle to maintain high display quality across varying illuminance environments without increasing cost, as existing methods for controlling backlight luminance and frame insertion lead to increased power consumption and image quality issues.
Innovation Solution
A display device equipped with an illuminance sensor, input average luminance detection circuit, frame insertion control circuit, and insertion luminance level generation circuit to dynamically adjust the luminance of gray image frames and backlight based on environmental illuminance, ensuring optimal display quality with minimized cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black image frame is inserted in double-speed drive to reduce image blur, then image blur is reduced, but displayed images are recognized as being dark
Solution Approach 1:
The patent applies dynamics by making the insertion frame luminance adaptive rather than fixed. The insertion luminance level generation circuit dynamically adjusts the luminance of inserted frames based on the illuminance detected by the illuminance sensor, allowing the display to adapt between dark (black frames) and bright (gray/white frames) insertion frames according to environmental conditions.
Solution Approach 2:
The patent changes the luminance parameter of insertion frames based on environmental illuminance. By detecting surrounding illuminance levels and adjusting insertion frame luminance accordingly, the system transforms fixed-parameter black frame insertion into variable-parameter adaptive frame insertion, resolving the contradiction between reducing image blur and maintaining display brightness.
2Illumination intensity
If a gray image frame or white image frame is inserted in place of black image frame to prevent dark display, then display brightness is improved, but displayed images give an adverse impression of being too bright under dark surrounding environment
Solution Approach 1:
The patent implements feedback by using the illuminance sensor to detect environmental illuminance levels and feeding this information back to the insertion luminance level generation circuit. This closed-loop control allows the system to automatically adjust insertion frame luminance based on actual environmental conditions, ensuring appropriate brightness adaptation to surrounding environment.
Solution Approach 2:
The system transitions from static insertion frame luminance (fixed black or gray/white) to dynamic adaptive luminance control. The insertion luminance level generation circuit continuously adjusts insertion frame brightness based on real-time illuminance sensor feedback, enabling the display to adaptively match environmental lighting conditions.
3Object-affected harmful factors
If backlight luminance is controlled to prevent visibility reduction in bright environment, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent segments the luminance control function into two independent components: backlight luminance control and insertion frame luminance control. This segmentation allows selective application of control strategies - using insertion frame luminance adjustment primarily to maintain visibility, thereby reducing the need for high backlight luminance and lowering overall power consumption.
Solution Approach 2:
The insertion frames act as an intermediary element between the backlight and the viewer. By controlling insertion frame luminance levels, the system can compensate for visibility issues without necessarily increasing backlight luminance to maximum levels, thus reducing power consumption while maintaining visibility.
Data Source
AI summary
A display device includes an illuminance sensor for detecting an illuminance in a surrounding environment, an input average luminance detection circuit for detecting an average luminance of input images, a frame insertion control circuit for producing a gray image frame and inserting the produced gray image frame into between an input image frame and its subsequently input image frame input, and an insertion luminance level generation circuit for determining a luminance of the gray image frame according to the illuminance detected by the illuminance sensor and the average luminance of the input images detected by the input average luminance detection circuit.