Segmented Sub-Pixel Display for High Dynamic Range and Color Stability
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Solution Overview
Problem
Existing display technologies face challenges in achieving a high dynamic range with short turn-on times and optimal brightness, often resulting in red shifts at low brightness and limited maximum brightness due to the differences in turn-on times and chip sizes of red, green, and blue LED chips.
Innovation Solution
The display apparatus employs a semiconductor light source with independently controllable sub-pixels, where the number of active sub-pixels increases with energization intensity, allowing for a stepped increase in light-emitting area, thereby minimizing turn-on delay and achieving a high brightness dynamic range without color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED chips with different chip sizes are used for red, green, and blue colors, then color emission is achieved, but turn-on times differ significantly causing red shifts at low brightness
Solution Approach 1:
The patent divides each pixel into multiple sub-pixels of the same color (e.g., multiple red sub-pixels, multiple green sub-pixels, multiple blue sub-pixels). These sub-pixels have different emission areas and are activated in steps based on brightness requirements. This segmentation allows the system to select appropriate sub-pixels to minimize turn-on time differences and achieve consistent color output across the brightness range.
2Illumination intensity
If LED chip size is increased to improve maximum brightness, then higher brightness is achieved, but turn-on time increases and energy efficiency decreases
Solution Approach 1:
The patent implements dynamic selection of sub-pixels based on the required brightness level. For low brightness requirements, smaller sub-pixels are activated which have faster turn-on times and lower power consumption. For high brightness requirements, larger sub-pixels are activated to provide sufficient luminance. This dynamic adaptation optimizes the balance between brightness output and energy efficiency across the entire operating range.
3Loss of time
If LED chip size is decreased to reduce turn-on time, then faster response is achieved, but maximum brightness is limited
Solution Approach 1:
The patent segments the pixel into multiple sub-pixels with different emission areas. Smaller sub-pixels provide fast turn-on response for low brightness content, while larger sub-pixels are available to be activated when high brightness is required. This segmentation strategy allows the system to achieve both fast response times and high maximum brightness by appropriately selecting which sub-pixels to activate based on the display content requirements.
4Illumination intensity
If different chip sizes are used for different colors, then color emission characteristics are optimized, but color shifts occur at low brightness due to turn-on time differences
Solution Approach 1:
The patent segments each color channel into multiple sub-pixels with different emission areas. By activating appropriate combinations of sub-pixels based on brightness requirements, the system maintains consistent color output across the brightness range. The control unit calculates which sub-pixels to activate to achieve the desired brightness while maintaining color accuracy, preventing red shifts and other color inconsistencies at low brightness levels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables a brightness ratio of at least 500,000:1 and maintains acceptable turn-on behavior, allowing for higher display brightness and energy efficiency without color shifts, particularly in HDR applications.
Implementation Method 1
The picture elements are in each case configured for emitting visible light in different colors in an adjustable manner... light generation in the picture elements is based on a single semiconductor layer sequence or, particularly preferably, on a plurality of semiconductor layer sequences
Data Source
AI summary
A display apparatus includes a multiplicity of picture elements for emitting visible light in different colors in an adjustable manner by means of a plurality of semiconductor layer sequences. Each of the picture elements has a plurality of types of pixels and each type of pixels is configured for emitting light of a specific color. The pixels are each subdivided into a plurality of sub-pixel. All the sub-pixels are configured for emitting light of the same color out of the display apparatus without further color change. At least two sub-pixels within each pixel have emission areas of different sizes. An electrical control unit is assigned to each pixel. The control units are each configured to automatically control the sub-pixels of a relevant pixel depending on an energization intensity in such a way that a light-emitting area of the relevant pixel increases in stepped fashion with the energization intensity.