Split-Electrode Pixel Layout for Low-Gray-Scale Precision
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Solution Overview
Problem
Current display technologies face challenges in achieving precise gray scale expression, particularly in low gray scale areas, due to limitations in controlling the current flow to individual light source units in pixels with subminiature light emitting elements.
Innovation Solution
The implementation of a pixel structure with separate sub-emission areas and driving circuits for each light source unit, allowing for independent control of driving currents based on different gamma values applied to data signals, enabling selective activation of light emitting elements to enhance gray scale precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light source unit is used per pixel, then the device complexity is reduced, but the gray scale expression precision deteriorates
Solution Approach 1:
The pixel is divided into multiple sub-emission areas (first sub-emission area and second sub-emission area), each containing separate light source units with independent driving circuits. This segmentation allows precise control of gray scales in different regions, improving overall gray scale expression precision while managing complexity through modular design
Solution Approach 2:
Different gamma values are applied to different sub-emission areas to optimize local display characteristics. The first light source unit uses a first gamma value while the second light source unit uses a second gamma value, allowing each region to have optimized gray scale characteristics for its specific function
2Measurement precision
If separate driving circuits are used for each light source unit, then the gray scale expression precision is improved, but the device complexity increases
Solution Approach 1:
The driving circuit is segmented into multiple independent units (first driving circuit and second driving circuit), each controlling a specific light source unit. This allows independent optimization of each driving circuit for its designated function while maintaining overall system manageability through modular architecture
Solution Approach 2:
The driving circuits are designed with multi-functionality to handle different gamma values and control modes. The same basic circuit structure can operate in different configurations (first driving mode and second driving mode) depending on the required gray scale precision and luminance characteristics
3Illumination intensity
If multiple light source units are activated simultaneously, then the luminance output is increased, but the energy consumption increases
Solution Approach 1:
The system dynamically selects which light source units to activate based on the required luminance level and gray scale precision. Different driving modes allow the system to adaptively control the number and intensity of active light sources, optimizing the balance between luminance output and energy consumption for each display scenario
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 allows for more precise gray scale representation even in low gray scale areas by selectively driving light source units, improving the overall gray scale expression capability of the display device.
Implementation Method 1
a first light source unit disposed in the first sub-emission area, the first light source unit including at least one first light emitting element electrically connected between at least one first split electrode and a second power supply
Data Source
AI summary
A pixel includes first and second sub-emission areas enclosed by a bank; a first light source unit disposed in the first sub-emission area, and including at least one first light emitting element connected between at least one first split electrode and a second power supply; a second light source unit disposed in the second sub-emission area, and including at least one second light emitting element connected between at least one second split electrode and the second power supply; a first driving circuit connected between a first power supply and the at least one first split electrode, and supplying a first driving current to the first light source unit in response to a first data signal; and a second driving circuit connected between the first power supply and the second split electrode, and supplying a second driving current to the second light source unit in response to a second data signal.