Super Pixel Architecture for Peak-Current HDR Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies face inefficiencies in achieving peak current efficiency while providing a high dynamic range, particularly in thin film transistor (TFT) displays, leading to non-uniform LED responses and reduced panel lifetime.
Innovation Solution
The implementation of super pixels with symmetric or asymmetric subpixels, controlled individually to vary current distribution and utilize pulse width modulation, combined with pulse amplitude modulation, to achieve peak current efficiency and enhance dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If pulse width modulation is used to control brightness, then dynamic range is improved, but current efficiency deteriorates
Solution Approach 1:
The pixel is divided into multiple subpixels (e.g., red, green, blue subpixels), each capable of being independently controlled. This segmentation allows the system to selectively activate only the necessary subpixels for displaying a given color, thereby maintaining current efficiency while achieving a wide dynamic range through combinatorial control of multiple subpixels.
2Use of energy by moving object
If constant current is provided to light emitting diodes, then current efficiency is improved, but brightness control precision deteriorates
Solution Approach 1:
Different subpixels within the same pixel are assigned different current characteristics. Specifically, red subpixels receive higher current than green or blue subpixels to compensate for the lower efficiency of red LEDs. This local quality adjustment ensures that all subpixels contribute equally to perceived brightness, achieving precise brightness control while maintaining overall current efficiency.
3Ease of operation
If multiple subpixels are controlled individually, then brightness control is improved, but device complexity increases
Solution Approach 1:
Multiple subpixels are merged into a single functional unit called a superpixel, which is treated as one addressable element by the display controller. This merging approach allows individual control of subpixels for precise brightness management while simplifying the overall control architecture, as the controller interacts with superpixels rather than managing each subpixel separately.
Data Source
AI summary
A display system of a display includes a first light emitting diode, a second light emitting diode, a current source, and at least one transistor. The first and the second light emitting diodes emit light. The current source provides a constant current to the first light emitting diode and the second light emitting diode. Moreover, the at least one transistor removes the current or shunts the current towards the first light emitting diode, the second light emitting diode, or both. Removing the current or shunting the current towards the first light emitting diode, the second light emitting diode, or both, may blend outputs of the first light emitting diode and the second light emitting diode.