Micro-LED Frame Segmentation for Full-Color Pixel Driving
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Solution Overview
Problem
Existing display technologies using semiconductor light-emitting elements face challenges in achieving high definition and low cost due to the need for multiple sub-pixels per pixel, leading to issues like high cost and decreased yield, and multicolor micro-LEDs lack effective circuit configurations for color control.
Innovation Solution
A light-emitting device with tunable light-emitting elements and a driving method that divides a frame into subframes to control light emission colors, using a single light-emitting element to emit different colors in separate subframes, thereby suppressing color separation and enabling full-color display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sub-pixels (RGB) are arranged for each pixel to achieve full-color display, then color display capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The frame period is segmented into multiple subframes, with each subframe dedicated to displaying a specific color (R, G, or B). This temporal segmentation allows a single pixel to achieve full-color display capability by sequentially emitting different colors, replacing the spatial segmentation approach of using multiple sub-pixels simultaneously.
Solution Approach 2:
The light-emitting element operates periodically by alternating between different emission colors across successive subframes. Each pixel emits red light in the R-subframe, green light in the G-subframe, and blue light in the B-subframe, creating a periodic color sequence that the human eye perceives as full-color due to persistence of vision.
2Adaptability or versatility
If multiple sub-pixels are arranged for each pixel to achieve full-color display, then color display capability is improved, but manufacturing yield decreases
Solution Approach 1:
Multiple sub-pixels (R, G, B) that were previously arranged spatially within each pixel are merged into a single light-emitting element. This element is capable of emitting multiple colors sequentially, reducing the total number of LED components from three per pixel to one, thereby simplifying manufacturing and improving yield.
Solution Approach 2:
A single light-emitting element is designed to perform multiple functions by emitting different colors (R, G, B) at different times. This multi-functional element replaces what previously required three separate single-color sub-pixels, reducing component count and manufacturing complexity.
3Device complexity
If a single LED element emits multicolor light, then device complexity is reduced, but control precision for achieving all chromaticity ranges deteriorates
Solution Approach 1:
The light-emitting element operates in a dynamic mode where its emission color is continuously adjusted by varying the drive current. By dynamically changing the current level, the element can achieve different chromaticity points across the R, G, and B ranges, providing precise color control despite using a single element.
Solution Approach 2:
The drive current parameter is used to control the emission color of the light-emitting element. By adjusting the current magnitude, the element transitions between different colors and chromaticity values, enabling precise control over the displayed color range without requiring multiple fixed-color elements.
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 allows for full-color light emission without color separation, reduces power consumption, and simplifies manufacturing processes while maintaining high luminance efficiency.
Implementation Method 1
a plurality of light-emitting elements are arranged in a predetermined pattern, a light emission color of each of the plurality of light-emitting elements being variable in accordance with a drive current
Data Source
AI summary
A light-emitting device includes: a display comprising a plurality of pixels in which a plurality of light-emitting elements are arranged in a predetermined pattern, a light emission color of each of the plurality of light-emitting elements being variable in accordance with a drive current; and a lighting controller configured to supply a drive current to each of the plurality of light-emitting elements and control a light emission period of each of the plurality of light-emitting elements. The lighting controller is configured to: divide one frame, in which the lighting controller drives the plurality of light-emitting elements to emit light, into a first subframe and a second subframe, drive the plurality of light-emitting elements to emit light of a first light emission color in the first subframe, and drive the plurality of light-emitting elements to emit light of a second light emission color in the second subframe, the second light emission color being different from the first light emission color.