Adaptive Image Display Mode Switching for Brightness and Contrast
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Solution Overview
Problem
Conventional digital display apparatuses struggle to simultaneously achieve good contrast for dim images and brightness for bright images, and existing solutions, such as Texas Instruments' digital projection apparatus with a changeable lens aperture, are either ineffective or costly and limited to projection systems.
Innovation Solution
An image display method that detects the maximum average picture level of each image, adjusts the displaying mode based on this level, and uses an image micro-adjusting mechanism to adjust Gamma, brightness, or contrast, allowing for seamless switching between high-brightness and high-contrast modes without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-brightness mode is selected, then brightness of bright images is improved, but contrast of dim images deteriorates
Solution Approach 1:
The patent applies dynamics by making the display mode changeable and adaptive rather than fixed. The system dynamically switches between high-brightness mode and high-contrast mode based on the detected average luminance level of the image content, allowing the display characteristics to adapt to different scene requirements and resolve the contradiction between brightness and contrast performance
Solution Approach 2:
The patent changes display parameters (brightness and contrast settings) based on the detected average luminance level of the image. By detecting whether the average luminance exceeds a threshold and accordingly adjusting the display mode, the system optimizes both brightness for bright images and contrast for dim images, resolving the technical contradiction
2Manufacturing precision
If lens aperture is changed to improve brightness or contrast, then displaying quality is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical lens aperture system with an electronic/image-processing solution. Instead of physically changing the lens aperture to control brightness and contrast, the system detects average luminance and switches between display modes through electronic control, eliminating the need for additional mechanical components while achieving the same displaying quality improvement
Solution Approach 2:
The patent uses image signal processing to achieve the effect of physical aperture control. By detecting luminance characteristics and adjusting display parameters through software control, the system creates a virtual equivalent of the mechanical aperture control without the physical hardware, reducing device complexity
3Manufacturing precision
If lens aperture switching is used to adjust brightness and contrast, then displaying quality is improved, but production cost increases
Solution Approach 1:
The patent eliminates the need for mechanical aperture components by using image detection and electronic mode switching. This substitution reduces bill of materials costs and simplifies the manufacturing process, thereby reducing production cost while maintaining displaying quality improvement
4Manufacturing precision
If displaying mode is switched between bright and dim images, then displaying quality is improved, but viewer comfort deteriorates due to obvious switching
Solution Approach 1:
The patent uses a threshold-based detection mechanism where mode switching is triggered only when the average luminance significantly exceeds or falls below the threshold. This partial switching approach, combined with the inherent smooth transition between modes, prevents excessive and frequent switching that would cause viewer discomfort while still achieving the necessary displaying quality improvement
Data Source
AI summary
An image display method adapted for a digital display apparatus is provided. The image display method includes the steps of: first, detecting a maximum average picture level of each picture displayed by the digital display apparatus; judging whether the maximum average picture level is larger than a reference value; determining a displaying mode of each picture according to the judgment. The image display method is adapted for improving the displaying quality of a digital display apparatus.