Micro LED Sub-Pixel Series Layout for Low-Gray Color Uniformity
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Solution Overview
Problem
Current display devices using LED technology face challenges with power efficiency, brightness uniformity, and color reproduction, particularly in low luminance regions, due to limitations in red, green, and blue chip configurations and high heat issues affecting electrochemical properties.
Innovation Solution
A display device design incorporating a Thin Film Transistor (TFT) substrate with a light emitting package featuring series-connected LEDs of primary colors, a transparent resin layer, and a wiring layer to improve power consumption ratio and facilitate grayscale expression, while reducing thickness for enhanced color clarity and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red LED is driven at high current to achieve target brightness, then brightness is improved, but power consumption increases and heat generation worsens
Solution Approach 1:
The patent divides the red light emission function into two segments: a first red light emitting element for low gray scale display and a second red light emitting element for high gray scale display. This segmentation allows each element to operate in its optimal current range, improving overall power efficiency while maintaining brightness requirements.
Solution Approach 2:
The patent applies partial action by using only the first red light emitting element for low gray scale display, and only the second red light emitting element for high gray scale display. This selective activation reduces unnecessary power consumption and heat generation while achieving the required brightness levels.
2Illumination intensity
If red LED is driven at high current to achieve target brightness, then brightness is improved, but heat generation increases causing non-uniformity of electrochemical properties
Solution Approach 1:
The patent segments the red light emission into two separate elements operating at different current levels. The first element operates at low current for low gray scales, and the second element operates at high current for high gray scales. This segmentation prevents excessive heat generation while maintaining required brightness.
Solution Approach 2:
The patent uses partial action by activating only the appropriate red light emitting element based on gray scale requirements. Low gray scales use only the first element, and high gray scales use only the second element, minimizing heat generation while achieving target brightness.
3Device complexity
If parallel connection structure with PM driving is used, then device complexity is reduced, but power efficiency deteriorates
Solution Approach 1:
The patent implements dynamic control by using TFT-based active matrix driving that can independently control the first and second red light emitting elements based on gray scale requirements. This dynamic control optimizes power efficiency while maintaining manageable device complexity through selective element activation.
4Reliability
If deviation of luminance is large in low voltage range, then LED characteristics are maintained, but gray expression becomes difficult
Solution Approach 1:
The patent segments the gray scale display into two ranges: low gray scales displayed by the first red light emitting element and high gray scales displayed by the second red light emitting element. This segmentation enables smooth gray expression across the entire range while maintaining LED characteristics in each segment.
Solution Approach 2:
The patent applies local quality by optimizing each red light emitting element for its specific gray scale range. The first element is optimized for low gray scales with appropriate luminance characteristics, while the second element is optimized for high gray scales, ensuring smooth transitions and accurate gray expression throughout.
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 improves power consumption, brightness uniformity, and color reproduction, enabling better grayscale expression and image quality, especially in low luminance areas, and is applicable to various display devices including liquid crystal displays.
Implementation Method 1
LED (light emitting diode), which is a well-known semiconductor light-emitting element that converts electric current into light
Data Source
AI summary
The present invention can be applied to the technical field of display devices, and relates to a display device using, for example, a micro light emitting diode (LED). A display device using a light emitting diode according to the present invention may comprise: a thin film transistor (TFT) substrate which includes a TFT for driving an active matrix and a connection pad connected to the TFT; a light emitting package including a unit pixel which is positioned on the TFT substrate and electrically connected to the connection pad, wherein the light emitting package includes a transparent resin layer, a wiring layer positioned on the TFT substrate, and at least two light emitting diodes which are connected to each other in series and are each positioned between the TFT substrate and the transparent resin layer and electrically connected to the wiring layer to form a sub pixel; and a connection wire electrically connecting the wiring layer and the connection pad.