RGB LED Stack Layout for Faster Display Pixel Mounting
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Solution Overview
Problem
The mounting process for LED displays is time-consuming due to the need for precise arrangement of red, blue, and green LEDs, and the stacking sequence is restricted by light absorption, affecting the light emitting regions of LEDs.
Innovation Solution
A novel LED structure where the semiconductor layers of red, green, and blue LEDs are stacked horizontally, allowing independent emission of colors without interference, and electrodes are positioned to facilitate electrical connection without obstructing light paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If individual light emitting devices are arranged on each subpixel to emit blue, green, and red light, then color display is achieved, but the number of light emitting devices increases and mounting time consumption increases
Solution Approach 1:
The patent combines multiple light emitting devices (blue LED, green LED, red LED) into a single integrated light emitting device structure. The semiconductor layers of different LEDs are stacked vertically on a common substrate, allowing multiple colors to be emitted from one device location rather than requiring separate devices for each color subpixel.
Solution Approach 2:
The patent transitions from a planar arrangement of separate LED devices to a vertical three-dimensional stacking configuration. By arranging semiconductor layers in the vertical dimension (stacking blue, green, and red LED layers on top of each other), the patent reduces the horizontal space required and decreases the number of individual devices needed per pixel.
2Quantity of substance
If light emitting devices are stacked vertically to reduce the number of devices, then device count is reduced, but the stacking sequence is restricted by light absorption affecting light emitting regions
Solution Approach 1:
The patent extracts the problematic light absorption interaction by positioning the light emitting regions of different LED layers at different vertical heights. The blue LED layer is positioned higher than the green LED layer, which is positioned higher than the red LED layer, ensuring that emitted light from each layer does not pass through absorbing materials of other layers, thus eliminating wavelength-dependent stacking restrictions.
Solution Approach 2:
The patent segments the light emitting device into distinct vertical layers with separate light emitting regions. Each LED type (blue, green, red) has its own dedicated layer with independently controllable light emission, allowing flexible stacking sequences without cross-interference from light absorption between different color layers.
3Reliability
If electrodes are added to connect multiple LED units, then electrical connection is achieved, but light emitting regions may be obstructed
Solution Approach 1:
The patent applies local quality by positioning electrodes specifically at the peripheral regions of the light emitting device rather than across the entire surface. The electrodes are arranged to make electrical connections to the semiconductor layers without covering or obstructing the central light emitting regions, thus maintaining both electrical connectivity and light emission efficiency.
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 structure reduces the number of LEDs required per pixel, enables flexible stacking sequences, and improves contrast ratios by minimizing light interference, thus enhancing manufacturing efficiency and display quality.
Implementation Method 1
a first LED unit including a first light emitting stack, a second LED unit including a second light emitting stack, and a third LED unit including a third light emitting stack
Data Source
AI summary
A display apparatus includes a display substrate, and light emitting devices arranged on an upper surface of the display substrate. At least one of the light emitting devices includes a first LED unit including a first light emitting stack, a second LED unit including a second light emitting stack, and a third LED unit including a third light emitting stack. The second LED unit is disposed between the first LED unit and the third LED unit. Each of the first to third light emitting stacks includes a first conductivity type semiconductor layer and a second conductivity type semiconductor layer. The first conductivity type semiconductor layer and the second conductivity type semiconductor layer in each of the first to third light emitting stacks are stacked in a horizontal direction with respect to the upper surface of the display substrate.