Display Pixel Light-Unit Layout Balancing Brightness and Power
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Solution Overview
Problem
Existing display devices face challenges in achieving high luminous efficiency and brightness for each color in a pixel unit while maintaining low power consumption.
Innovation Solution
A display device incorporating at least one first and one second light-emitting unit, where the external quantum efficiency of the first unit is less than that of the second unit at certain currents, and the quantity or area of the first unit is adjusted relative to the second unit based on current thresholds to optimize luminous efficiency and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the quantity of light-emitting units with lower external quantum efficiency is increased to achieve high brightness, then the brightness requirement is met, but the power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating the characteristics of light-emitting units based on their external quantum efficiency. First light-emitting units with lower EQE are assigned different quantities or areas compared to second light-emitting units with higher EQE. This localized differentiation allows each unit type to contribute optimally to the overall brightness while managing power consumption according to its efficiency characteristics.
Solution Approach 2:
The patent changes the parameter of light-emitting unit quantity or area based on external quantum efficiency characteristics. By adjusting the quantity of first light-emitting units relative to second light-emitting units according to a threshold current, the system optimizes the balance between brightness output and power consumption, achieving high brightness while minimizing energy use.
2Measurement precision
If the quantity of light-emitting units is increased to meet color point requirements, then the color accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different quantities or areas to first and second light-emitting units based on their external quantum efficiency. This differentiated approach allows the pixel unit to achieve accurate color points by optimizing the contribution of each unit type, rather than uniformly increasing the number of all light-emitting units, thereby avoiding unnecessary device complexity.
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
The solution enhances luminous efficiency and brightness of each color in the pixel unit by adjusting the quantity or area of the first light-emitting unit relative to the second unit, meeting high brightness and color point requirements while minimizing power consumption.
Implementation Method 1
a first light-emitting unit and at least one second light-emitting unit... An external quantum efficiency of the first light-emitting unit at a first current is less than an external quantum efficiency thereof at a second current
Data Source
AI summary
A display device includes first and second light-emitting units. An external quantum efficiency of the first light-emitting unit at a first current is less than at a second current. An external quantum efficiency of the second light-emitting unit at the first current is greater than at the second current. The first and second light-emitting units are operated at first and second operating currents respectively. When the first operating current is less than or equal to a threshold current, a quantity of the first light-emitting unit is greater than a quantity of the second light-emitting unit; and when the first operating current is greater than the threshold current, the quantity of the first light-emitting unit is less than the quantity of the second light-emitting unit. The first current is less than the second current. The threshold current is greater than the first current and less than the second current.