MIM Diode Pixel Circuit for Low Power Mini LED Display
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Solution Overview
Problem
Active matrix backplanes for high dynamic range LCDs with mini LEDs consume excessive power due to the need for individual LED driving, which is inefficient and power-intensive, especially when using TFT backplane arrays.
Innovation Solution
The implementation of a display system utilizing metal-insulator-metal (MIM) diodes and storage capacitors in a series and parallel configuration within a pixel array, allowing for simultaneous control of LEDs with opposing polarities to reduce power consumption and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TFT backplane arrays are used to drive individual LEDs, then LED control precision is improved, but power consumption increases excessively
Solution Approach 1:
The patent merges the LED driving function with the select line signaling function by using MIM diodes that can be selectively biased by select lines. This combines two separate functions (LED driving and signal selection) into a single integrated mechanism, eliminating the need for separate TFT switching circuits and reducing overall power consumption while maintaining precise LED control.
Solution Approach 2:
The patent replaces the mechanical/TFT-based switching system with an electrical field-based MIM diode system. Instead of using physical transistor switches to control LED current, the invention uses electric fields to bias MIM diodes, which inherently provide current control with lower power consumption and simpler structure.
2Illumination intensity
If individual LED driving is implemented, then display dynamic range is improved, but device complexity increases
Solution Approach 1:
The select lines serve multiple functions: they act as both selection signals for addressing pixels and as driving signals for controlling LED current through the MIM diodes. This multi-functionality eliminates the need for separate driving circuits, reducing device complexity while maintaining the ability to control individual LEDs for high dynamic range display.
3Ease of operation
If TFT backplane arrays are used, then LED addressing capability is improved, but power consumption increases
Solution Approach 1:
The patent extracts the LED driving function from the TFT backplane array and integrates it directly into the select line system through MIM diodes. This extraction eliminates the power-intensive TFT switching operation while preserving the addressing capability, as the same select lines that address pixels also drive the LEDs with much lower power consumption.
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 configuration enables lower power consumption and more efficient LED control, reducing the overall energy required to drive the LEDs while maintaining high dynamic range capabilities.
Implementation Method 1
a first metal-insulator-metal (MIM) diode and a second MIM diode electrically coupled in series between a first of the plurality of select lines and a second of the plurality of select lines
Implementation Method 2
a first light emitting diode (LED) electrically coupled, in parallel, between a first of the plurality of data lines and between the first MIM diode and the second MIM diode
Data Source
AI summary
A representative display system includes: a pixel array having a plurality of pixels, a plurality of select lines, and a plurality of data lines; a first of the plurality of pixels having a first metal-insulator-metal (MIM) diode, a second MIM diode, a first storage capacitor, and a first light emitting diode (LED), the first MIM diode and the second MIM diode being electrically coupled in series between a first of the plurality of select lines and a second of the plurality of select lines, the first storage capacitor and the first LED being electrically coupled, in parallel, between a first of the plurality of data lines and between the first MIM diode and the second MIM diode; wherein the first LED is selectively controllable to emit light in response to corresponding select signals simultaneously provided on the first of the plurality of select lines and the second of the plurality of select lines and in response to data signals on the data lines.