Pixel Driving Circuit with Segmented LED Emission Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light-emitting diodes (LEDs) face challenges in maintaining high luminous efficiency over time due to heat accumulation and reduced current density, leading to stability issues and decreased performance.
Innovation Solution
A pixel driving circuit with a light-emitting diode chip that includes multiple light-emitting portions, each with independent control, allowing for alternating or simultaneous emission to manage current density and reduce heat accumulation, comprising a data writing circuit, a light-emitting control circuit, and reset compensation circuits to optimize voltage and enable signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LEDs operate continuously at high current density, then brightness and luminous output are maintained, but heat accumulation increases and luminous efficiency decreases over time
Solution Approach 1:
The LED chip is divided into multiple light-emitting portions (first, second, third portions) that can be independently controlled. By segmenting the single LED into multiple portions, the circuit can alternate activation between portions, allowing active portions to emit light while inactive portions rest and cool down, thus reducing overall heat accumulation while maintaining brightness output.
Solution Approach 2:
The patent implements periodic action by alternately activating different light-emitting portions in time-division multiplexing fashion. The first and second portions are activated in alternating periods, and the third portion is activated in another period, allowing each portion to have rest periods for heat dissipation while maintaining continuous or near-continuous overall light output.
2Reliability
If conventional LEDs operate at high current density, then luminous efficiency is maintained, but stability and longevity decrease due to heat accumulation
Solution Approach 1:
Dividing the LED chip into multiple independently controllable portions allows the system to manage thermal load more effectively. By activating portions alternately rather than simultaneously, each portion experiences reduced cumulative heat stress, improving overall reliability and longevity of the LED chip.
Solution Approach 2:
The periodic activation pattern ensures that no single light-emitting portion is subjected to continuous high current stress. The alternating activation of first and second portions, and separate activation of third portion, provides thermal cycling that reduces cumulative thermal damage and improves stability over time.
3Illumination intensity
If multiple light-emitting portions are activated simultaneously, then total light output increases, but current density per portion decreases and heat management becomes more difficult
Solution Approach 1:
The LED chip is segmented into multiple portions with independent control, allowing flexible activation patterns. This segmentation enables the system to achieve high total light output by activating multiple portions while managing heat distribution through selective, non-simultaneous activation of portions.
Solution Approach 2:
By using periodic activation patterns where different portions are activated in different time periods rather than simultaneously, the system maintains high overall light output while distributing thermal load across different portions at different times, improving heat management.
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 enhances luminous efficiency by managing current density and heat distribution, improving the stability and longevity of the LED chip by allowing for flexible light-emitting strategies, such as alternating or simultaneous emission of light from multiple portions.
Implementation Method 1
The light-emitting diode chip includes a plurality of light-emitting portions. The light-emitting diode chip is configured to, with cooperation of the first voltage signal from the second node and a second voltage signal received at the second voltage signal terminal, drive the plurality of light-emitting portions to emit light
Data Source
AI summary
A pixel driving circuit includes a data writing circuit, a light-emitting control circuit and a light-emitting diode chip. The data writing circuit is electrically connected to a first scanning signal terminal, a data signal terminal and a first node. The light-emitting control circuit is electrically connected to the first node, an enable signal terminal, a first voltage signal terminal and a second node, and is configured to transmit a first voltage signal received at the first voltage signal terminal to the second node. The light-emitting diode chip is electrically connected to the second node and a second voltage signal terminal. The light-emitting diode chip includes a plurality of light-emitting portions. The light-emitting diode chip is configured to drive the plurality of light-emitting portions to emit light in different periods of time respectively or drive at least two light-emitting portions to emit light in a same period of time.