Pixel Circuit Structure for LED Heat Management
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Solution Overview
Problem
The luminous efficiency of LEDs in displays is significantly impacted by temperature rises due to heat accumulation, which existing technologies have not effectively addressed.
Innovation Solution
A pixel structure comprising multiple sub-pixels with two LEDs each, where the anodes of both LEDs are coupled to the same signal line and the cathodes to different signal lines, allowing for alternate emission of light to prevent heat accumulation, and a method to drive these LEDs to emit different colors simultaneously to enhance heat dissipation and luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple LEDs are operated simultaneously in each sub-pixel, then the luminous efficiency is improved, but heat accumulation occurs causing temperature rise
Solution Approach 1:
The patent implements periodic action by controlling the first and second LEDs to emit light alternately in different time periods rather than simultaneously. During a first time period, the first LED emits first color light while the second LED is off. During a second time period, the second LED emits second color light while the first LED is off. This periodic operation allows each LED to have rest periods, preventing heat accumulation and maintaining lower display temperature while still achieving effective light emission across both color channels.
2Adaptability or versatility
If LEDs emit different colors simultaneously, then the color gamut is enhanced, but heat accumulation reduces luminous efficiency
Solution Approach 1:
The patent uses periodic action to achieve different color emission at different time periods. The first LED emits first color light during a first time period, and the second LED emits second color light during a second time period. This temporal separation maintains broad color gamut capability while preventing simultaneous operation that would cause excessive heat accumulation and energy loss.
Solution Approach 2:
The patent applies dynamics by making the emission state of each LED changeable over time rather than static. The control circuit dynamically switches which LED is active during different time periods, allowing the system to adapt between emitting different colors at different times. This dynamic control enables the display to achieve varied color output while managing thermal characteristics through temporal distribution of emission duties.
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 effectively prevents heat accumulation, maintains luminous efficiency, and enhances the color gamut and resolution of displays by using a field sequential color method, allowing LEDs to take turns emitting light and be controlled by an integrated circuit.
Implementation Method 1
Each of the sub-pixels comprises a first light-emitting diode (LED) and a second LED. The first LED is configured to emit a first color light. The second LED is configured to emit a second color light.
Data Source
AI summary
A pixel structure includes a plurality of sub-pixels. Each of the sub-pixels includes a first light-emitting diode (LED) and a second LED. The first LED is configured to emit a first color light. The second LED is configured to emit a second color light. Each of the first LED and the second LED includes an anode and a cathode. The anode of the first LED and the anode of the second LED are coupled to a same signal line. The cathode of the first LED and the cathode of the second LED are coupled to different signal lines.