Dual-Gate Transistor LED Driver Circuit for Video Wall
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Solution Overview
Problem
Existing control circuits for large to very large displays or video walls face challenges in efficiently managing power supply and brightness, particularly in limited space and under varying external light conditions, which affects contrast and brightness.
Innovation Solution
A control circuit for LEDs that uses a dual-gate transistor with a backgate for pulse width modulation, allowing for space-saving and temperature-stabilized current control, and a control circuit that adjusts brightness by varying a voltage signal applied to the LEDs during different phases of a period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional control circuits are used for large displays, then the displays can be controlled, but the control circuits occupy excessive space and generate waste heat
Solution Approach 1:
The patent moves control functions from the planar display area to the vertical dimension by implementing control circuits on the backplane behind the display. This allows control elements to be positioned in the depth dimension rather than consuming lateral space, resolving the contradiction between control functionality and display area availability.
Solution Approach 2:
The patent introduces a backplane as an intermediary structure that carries control circuits separate from the display elements themselves. This mediator allows control functions to be implemented without directly occupying display area, while also providing thermal management benefits by separating heat-generating control circuits from the display surface.
2Length of stationary object
If display thickness is reduced to save space, then less space is available for components, but waste heat removal becomes more difficult
Solution Approach 1:
The patent segments the display structure into distinct functional layers: display elements in the front, a backplane carrying control circuits in the middle, and thermal management structures at the rear. This segmentation allows thin-profile construction while providing dedicated pathways for heat removal from control circuits without increasing overall display thickness.
Solution Approach 2:
The backplane serves as an intermediary thermal management structure that interfaces between the display elements and heat dissipation mechanisms. It provides a dedicated thermal pathway that allows efficient heat removal even in thin-display configurations, resolving the contradiction between reduced thickness and heat removal capability.
3Adaptability or versatility
If more control elements are added to improve display functionality, then display performance improves, but power consumption increases
Solution Approach 1:
The patent merges control functions into integrated circuits on the backplane, combining multiple control operations into unified control structures. This integration reduces the total number of discrete control elements required, thereby maintaining enhanced display functionality while reducing overall power consumption compared to using separate control elements for each function.
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 enables efficient and space-saving control of LED brightness and current, improving contrast and brightness stability across varying external light conditions, while reducing waste heat and failure risks.
Implementation Method 1
A control circuit for LEDs that uses a dual-gate transistor with a backgate for pulse width modulation, allowing for space-saving and temperature-stabilized current control
Implementation Method 2
a control circuit that adjusts brightness by varying a voltage signal applied to the LEDs during different phases of a period
Implementation Method 3
A driver circuit for a plurality of light-emitting diodes (LEDs)
Implementation Method 4
Each LED may have its own current source, in particular its own transistor
Data Source
AI summary
According to an aspect described herein, a device is proposed for electronically driving an LED comprising a data signal line, a threshold signal line, and a select signal line. Further provided is an LED electrically connected in series with a dual-gate transistor and together therewith between first and second potential terminals. A first control gate of the dual gate transistor is connected to the threshold line. The device also includes a select latch circuit comprising a charge latch connected to a second control gate of the dual gate transistor and to a current line contact of the dual gate transistor, and a control transistor comprising a control terminal connected to the select signal line.