AMOLED Data Driving Unit Current Mirror Segmentation
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Solution Overview
Problem
Conventional AMOLED panels face limitations in providing large currents to pixels, requiring increased data driving unit area which raises production costs.
Innovation Solution
The implementation of (N+1) mirror output circuits and switch elements in the data driving unit allows for the generation of multiple data currents proportional to a reference current, enabling the AMOLED panel to drive pixels with larger currents efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the data driving unit area is increased to provide larger current, then the current driving capability is improved, but the production cost increases
Solution Approach 1:
The data driving unit is segmented into multiple independent current mirror circuits (first current mirror circuit, second current mirror circuit, etc.), each capable of generating current independently. This segmentation allows the total current to be distributed across multiple smaller functional units rather than requiring one large current driving unit, thereby reducing the overall area and production cost while maintaining the required current driving capability.
2Power
If a single current mirror circuit is used, then the circuit structure is simple, but the current output is limited
Solution Approach 1:
Multiple current mirror circuits are merged into a single integrated data driving unit, with their output currents combined through parallel connection. The first current mirror circuit generates a first current, the second current mirror circuit generates a second current, and these currents are summed to produce a larger total output current. This merging approach multiplies the current output capability while keeping each individual circuit module relatively simple.
Solution Approach 2:
Each current mirror circuit module serves multiple functions: it acts as a current amplifier, a current source, and part of the overall current summation system. The repetitive modular structure allows each unit to perform the same function independently, and collectively they achieve the multi-functionality of high current output, stable voltage control, and scalable design.
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 enables the AMOLED panel to provide a range of currents, from the smallest to the largest, effectively driving AMOLED pixels with increased luminance without the need for larger data driving units, thus reducing production costs.
Implementation Method 1
The transistor T4 outputs the current IOLED to a light emitting diode 16 to display the corresponding luminance
Data Source
AI summary
An AMOLED panel includes an AMOLED pixel unit, a scan driving unit and a data driving unit. The scan driving unit is coupled to the AMOLED pixel unit. The data driving unit is coupled to the AMOLED pixel unit and a voltage source. The data driving unit comprises a reference current source circuit, (N+1) mirror output circuits and (N+1) switch elements. The reference current source circuit is for providing a reference current. (N+1) mirror output circuits are coupled to the reference current source circuits for outputting (N+1) corresponding data currents to the AMOLED pixel unit, wherein N is a positive integer. The m-th data current of the (N+1) data currents is 2m times of the reference current, and m is an integer 0˜N. The switch elements are disposed in correspondence with the mirror output circuits for controlling the data currents to be outputted to the AMOLED pixel unit.