Dual-Spectrum LED Pixel Layout for High-Luminance Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED display devices face challenges in achieving high luminance and definition due to limitations in light emitting area and current density, particularly with horizontal LED elements, which also incur higher material costs and are prone to pixel defects.
Innovation Solution
The development of an LED display device utilizing an LED element with a dual emission spectrum, where two active layers are controlled by different driving circuits, allowing for high luminance and definition, and enabling easy replacement of defective LED elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a horizontal LED element is used, then the light emitting area is increased, but the current density becomes too high making it difficult to generate high luminance
Solution Approach 1:
The patent divides a single horizontal LED element into two separate vertical LED elements (first vertical LED element and second vertical LED element). Each vertical element has its own n-type electrode and p-type electrode positioned at opposite ends, allowing independent current injection and light emission. This segmentation resolves the contradiction by maintaining adequate current density in each element while collectively providing sufficient light emitting area.
Solution Approach 2:
The patent combines two vertical LED elements into a single integrated structure where both elements are formed on the same substrate and can be controlled together. The first and second vertical LED elements are positioned adjacent to each other, merging their light output to achieve the desired luminance and coverage that would be difficult with a single element.
2Area of stationary object
If a horizontal LED element is used, then the light emitting area is increased, but the material cost increases
Solution Approach 1:
By segmenting the horizontal LED element into two vertical elements with independent electrodes, the patent enables more efficient material utilization. Each vertical element requires less material than a comparable horizontal element while achieving the same or better light output, thereby reducing overall material costs.
Solution Approach 2:
The patent changes the geometric parameters of the LED elements from horizontal orientation to vertical orientation. This parameter change affects both the current density distribution and material requirements, optimizing the balance between light emitting area and material cost.
3Area of stationary object
If a horizontal LED element is used, then the light emitting area is increased, but pixel defects occur more frequently
Solution Approach 1:
The patent segments the single horizontal LED element into two independent vertical LED elements, each with separate n-type and p-type electrodes. This segmentation isolates potential defect sources, so that a defect in one vertical element does not necessarily affect the other, thereby reducing the overall pixel defect rate while maintaining adequate light emitting area.
4Illumination intensity
If the LED element provides dual emission spectrum with two active layers, then high luminance and definition are achieved, but the device complexity increases
Solution Approach 1:
The patent implements a unified driving circuit that controls both the first and second vertical LED elements simultaneously. The driving circuit is designed to provide driving signals to multiple LED elements through a standardized interface, enabling the system to achieve high luminance and definition through coordinated operation of multiple elements without proportionally increasing circuit 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
This solution enables the LED display device to achieve high luminance and definition while minimizing pixel defects and reducing material costs by optimizing light emission and current management.
Implementation Method 1
The LED element is a semiconductor light emitting element using a characteristic emitting light when a current is passed therethrough
Implementation Method 2
When a current flows through the n-type electrode and the p-type electrode, electrons from the n-type electrode and holes from the p-type electrode combine in the active layer to emit light
Data Source
AI summary
In an LED display device according to an embodiment of the present disclosure, the LED display device comprises a second pixel driving circuit on a substrate, an LED element attached to a region not overlapping the second pixel driving circuit, including a first LED element, a second LED element and a growth substrate, and providing a double light-emitting spectrum, an element fixing layer surrounding the LED element, a first pixel driving circuit on the element fixing layer, and an element protecting layer on the first pixel driving circuit. In addition, the first LED element is controlled by the first pixel driving circuit, and the second LED element is controlled by the second pixel driving circuit. Therefore, the LED display device provides a dual emission spectrum, can realized high luminance and high definition, and can prevent a pixel defect.