Pixel Driving Circuit Voltage Dividing Unit for Mini-LED Current Precision
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Solution Overview
Problem
Conventional pixel driving circuits using MOSFETs struggle to output exact current corresponding to high grey scales, affecting the brightness and uniformity of Mini-LED display panels.
Innovation Solution
A pixel driving circuit is proposed, comprising a switch circuit, a storage circuit, and a light driving circuit with a voltage dividing unit that includes a resistor with resistance proportional to grayscale levels, allowing the MOSFET to operate in a constant current region and reduce current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If MOSFET is operated in saturation region, then the device can provide high current drive capability, but a few change in gate voltage induces great change in drain current, causing imprecise current output for high grey scales
Solution Approach 1:
The patent introduces a voltage dividing unit that changes the operating parameters of the MOSFET by dividing the gate voltage. This transforms the MOSFET's operation from direct saturation region control to a regulated current mode, where the current output becomes less sensitive to gate voltage variations, thereby improving current precision for high grey scales while maintaining drive capability
Solution Approach 2:
The voltage dividing unit acts as an intermediary between the gate voltage input and the MOSFET's current output. By inserting this intermediate stage, the patent decouples the direct relationship between gate voltage changes and drain current changes, allowing for more precise current control without sacrificing drive 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 enables precise control of current output under high grey scales, improving the brightness and uniformity of Mini-LED display panels by reducing current fluctuations.
Implementation Method 1
a voltage dividing unit that is coupled between the driving unit and the ground end
Implementation Method 2
The light-emitting unit is coupled between the supply voltage end and the driving unit or between the driving unit and the ground end
Data Source
AI summary
A pixel driving circuit and a mobile terminal are provided. The pixel driving circuit includes a switch circuit, a storage circuit, and a light driving circuit. The switch circuit receives data signal applied on the data line in response to scan signal applied on the scan line. The storage circuit is charged by the data signal. The light driving circuit emits light in response to the data signal. The light driving circuit includes a driving unit, light-emitting unit, a supply voltage end, a ground end, and a voltage dividing unit that is coupled between the driving unit and the ground end.