Delta Pixel Circuit Reduces Wiring Complexity in LED Displays
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Solution Overview
Problem
Conventional light emitting displays with a delta arrangement of LEDs require a large number of pixel circuits and suffer from reduced aperture ratio due to the need for multiple light emitting control lines, leading to inefficiencies in color separation and increased component count.
Innovation Solution
A delta pixel circuit design that connects three light emitting diodes (red, green, and blue) to a single pixel circuit, utilizing a driving circuit with multiple transistors and a capacitor to manage current and voltage, and a scan driver to reduce the number of scanning lines and control signals, allowing for efficient emission and improved aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one pixel circuit is connected with only one light emitting diode, then the circuit structure is simple, but a large number of pixel circuits are needed to emit multiple light emitting diodes, increasing device complexity
Solution Approach 1:
The patent merges three light emitting diodes (red, green, blue) into a single pixel circuit by sharing common electrodes and control lines. The delta arrangement allows three LEDs to be controlled by one pixel circuit through time-division multiplexing, reducing the number of pixel circuits from three to one while maintaining color separation capability.
Solution Approach 2:
The pixel circuit is designed with multi-functionality to control multiple light emitting diodes with different colors. The same pixel circuit can emit red, green, and blue light sequentially by controlling the switching elements, making the circuit universal for handling multiple color emissions rather than requiring separate dedicated circuits for each color.
2Reliability
If multiple light emitting control lines are used to control multiple light emitting diodes, then color control is precise, but the aperture ratio is reduced due to increased wiring occupation
Solution Approach 1:
The patent combines multiple light emitting control lines into a single shared control line for the delta arrangement. By using time-division multiplexing, the same control line can sequentially control different light emitting diodes, eliminating the need for separate control lines for each LED and thereby increasing the aperture ratio.
Solution Approach 2:
The patent transitions from spatial control (separate control lines for each LED) to temporal control (sequential activation through time-division multiplexing). This dimensional change from space to time allows multiple LEDs to be controlled by a single line, reducing wiring occupation and increasing aperture ratio while maintaining control precision.
3Reliability
If a large number of scanning lines are used to control multiple pixels, then pixel control is comprehensive, but the wiring structure becomes complex and aperture ratio decreases
Solution Approach 1:
The patent merges multiple scanning lines into a single scanning line for the delta arrangement. By using time-division multiplexing, one scanning line can sequentially control different pixels in the delta arrangement, reducing the number of scanning lines from multiple to one while maintaining comprehensive pixel control capability.
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 minimizes color separation, reduces the number of components, and enhances the aperture ratio by simplifying the wiring structure and reducing the number of scanning lines, resulting in a more efficient and effective light emitting display.
Implementation Method 1
An LED emits light when an exciton is generated by a recombination of an electron and a hole and then falls to a low energy level
Data Source
AI summary
A delta pixel circuit and a light emitting display are able to minimize a color separation phenomenon by adjusting an emitting point of a plurality of emitting diodes (or devices), reduce the number of driving circuits, and have a high aperture ratio. A first, second, and third light emitting diodes are arranged in a delta pattern and respectively correspond to a red color, a green color, and a blue color. A driving circuit is commonly connected with the first, second, and third light emitting diodes and is for supplying a current to each of the diodes. A switching circuit is connected between the driving circuit and the first, second, and third light emitting diodes and selectively supplies the current to the first, second, and third light emitting diodes.