Segmented LED Image-Forming Element for Contrast and Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED display technologies face issues with light leakage between pixels, leading to decreased contrast and increased energy consumption, as well as difficulties in repairing defective pixels due to complex electrode connections and high manufacturing costs.
Innovation Solution
An image-forming element with segmented light sources in each pixel, where power supply electrodes are on the same surface and connected to a drive circuit with a switch circuit, allowing for efficient light emission control and easy replacement of defective pixels, along with a mounting substrate that includes a drive circuit and electrodes for each light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED chips are integrated on a silicon substrate with drive circuits formed thereon, then power consumption is reduced and current consumption is greatly reduced compared to optical switching methods, but light leaks from a pixel emitting light to adjacent pixels causing decreased contrast
Solution Approach 1:
The patent divides the light emitting structure into segmented regions corresponding to individual pixels. Each pixel is isolated with light-shielding structures to prevent light from one pixel leaking to adjacent pixels, while maintaining the integrated LED-on-silicon substrate architecture for low power consumption.
Solution Approach 2:
The patent applies light-shielding structures selectively at the boundaries between pixels where light leakage occurs, rather than uniformly across the entire display. This local intervention prevents contrast degradation while preserving the energy-efficient integrated architecture.
2Ease of manufacture
If AlGaAs-based LEDs or flip chip connection structures are used, then manufacturing processes can be simplified, but electrode connections become complex making repair of defective pixels difficult
Solution Approach 1:
The patent structures the electrode connections in a segmented and organized manner, with separate connection regions for different LED chips. This modular electrode arrangement simplifies both manufacturing and repair processes by isolating connection points for individual pixels or groups of pixels.
Solution Approach 2:
The patent introduces intermediate connection structures or buffer regions between the LED chips and the silicon substrate that simplify the connection process and enable easier replacement of defective pixels without requiring complex reconnection procedures.
3Power
If the area occupation ratio of light source to pixel region is increased, then light emission efficiency is improved, but light leakage to adjacent pixels increases causing contrast degradation
Solution Approach 1:
The patent segments the light-emitting areas with light-shielding structures between adjacent pixels. This allows each pixel to have a larger light-emitting area for improved efficiency while the shielding structures prevent the increased light output from leaking to neighboring pixels.
Solution Approach 2:
The patent applies light-shielding structures specifically at the boundaries between pixels where light leakage is problematic, rather than reducing the overall light-emitting area. This local shielding approach preserves light emission efficiency while preventing contrast degradation from light leakage.
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 configuration enhances color rendering and contrast while reducing defects and energy consumption by minimizing light leakage and simplifying the manufacturing process, enabling high-yield production of LED display chips with improved light emission efficiency.
Implementation Method 1
a light emitting layer formed using AlInGaP
Implementation Method 2
an example in which phosphors of three colors are disposed on the LED of each pixel
Data Source
AI summary
An image-forming element includes a plurality of pixels, and projects and displays light emitted from the pixels. The image-forming element includes a light emitting element which includes a light source emitting the light and a mounting substrate on which a plurality of light emitting elements are provided on a mounting surface. A plurality of light sources which are segmented and included in at least one pixel are provided, and each of the light sources includes power supply electrodes provided on the same surface or a surface facing the mounting substrate. The mounting substrate includes a drive circuit which drives the light source and electrodes which are provided on the mounting surface and are electrically connected to the power supply electrodes of the light source. In each pixel, an area occupation ratio of the light source with respect to a region area of the pixel is 15% or more and 85% or less. The drive circuit includes a switch circuit which selectively short-circuits the electrodes electrically connected to the power supply electrodes of the light source with other electrodes or wirings in the drive circuit, or at least one non-volatile memory transistor for adjusting a light emission intensity of the light emitting element.