Display Device Light Source Brightness and Signal Adaptation
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Solution Overview
Problem
Existing display devices do not provide the best possible rendering of images due to inadequate adjustment of video signal amplitude and light source brightness, which affects the visibility of dark gray levels and overall image quality.
Innovation Solution
A display device with an adjustable light source and processing circuitry that selects a dimmed brightness level based on image pixel gray levels and adapts the input signal accordingly, allowing for a matching combination of brightness and signal adjustment for each image, considering operating conditions and limitations of the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amplitude of the video signal is dynamically adjusted based on detected brightness values, then the average brightness level is maintained, but the best possible rendering of all images is not achieved
Solution Approach 1:
The system dynamically adjusts both the video signal amplitude and the light source brightness based on the specific characteristics of each image being displayed. This dynamic adaptation allows optimal rendering for different image types (dark images, bright images, images with high dynamic range) rather than using a fixed adjustment strategy.
Solution Approach 2:
The invention changes multiple parameters simultaneously - both the amplitude of the video signal and the brightness of the light source - to achieve optimal image rendering. By adjusting these parameters in combination based on image-specific analysis, the system overcomes the limitation of previous approaches that only adjusted signal amplitude.
2Illumination intensity
If the light source brightness is increased to improve visibility of dark gray levels, then dark gray levels become more visible, but clipping of brighter gray levels occurs
Solution Approach 1:
The system applies different adjustment strategies to different parts of the gray level range based on the specific image characteristics. For dark images, it increases light source brightness to improve dark gray level visibility. For bright images or images with high dynamic range, it adjusts the video signal amplitude to prevent clipping of bright gray levels. This localized optimization for different gray level regions resolves the contradiction.
Solution Approach 2:
The system dynamically determines the appropriate brightness level and signal amplitude adjustment based on analyzing the specific image characteristics before display. This dynamic adaptation allows the system to optimize for dark gray level visibility when needed while preventing bright gray level clipping in other scenarios.
3Illumination intensity
If the light source brightness is continuously adjusted to match video signal amplitude, then image brightness is optimized, but the light source operating limitations are not considered
Solution Approach 1:
The system incorporates feedback regarding the light source's operating limitations and current state. By monitoring these limitations, the control mechanism can adjust the video signal amplitude and light source brightness within safe operating parameters, preventing damage or premature failure while still optimizing image brightness.
Solution Approach 2:
The system changes the operating parameters of the light source within a constrained range that respects its limitations. Rather than allowing unlimited brightness adjustment, the system modifies brightness and signal amplitude parameters within safe boundaries, ensuring both image quality and light source reliability.
Data Source
AI summary
The display device (DD) comprises an adjustable light source (BL), a display panel (DP) with display pixels for modulating light originating from the light source (BL) and processing circuitry (P) coupled to the display panel (DP) and the light source (BL). The processing circuitry (P) has an input for receiving an input signal (V1) representing gray levels of pixels of an image to be displayed on the display panel (DP). The processor (P) comprises:selecting circuitry (S) for selecting a dimmed brightness level of the light source (BL) in dependence on the gray levels of the image pixels, andadaptation circuitry (A) for adapting the input signal (V1) in dependence on the dimmed brightness level.