Display Gate Driver Stages With Dynamic Reduced Voltage Swing
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Solution Overview
Problem
Existing display driver circuitry for organic-light-emitting diode displays has limited flexibility due to its reliance on fixed voltage swing, which restricts the dynamic adjustment of power supply bias levels and increases power consumption.
Innovation Solution
The implementation of a chain of row driver circuits with a master and slave driver stage, where the slave stage uses dynamically adjustable power supply voltages, allowing for reduced voltage swing and enhanced flexibility in controlling display pixels, thereby minimizing power consumption and stress on the pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed voltage swing is used in row driver circuits, then ease of implementation is improved, but flexibility and power efficiency deteriorate
Solution Approach 1:
The row driver circuit is divided into two independent driver stages: a first driver stage that outputs signals with a first voltage swing, and a second driver stage that outputs signals with a second voltage swing. This segmentation allows each stage to operate with different voltage characteristics, enabling the circuit to maintain simple implementation while achieving flexible voltage control for power efficiency optimization.
Solution Approach 2:
The patent implements dynamic voltage swing control by allowing the second driver stage to operate with a reduced voltage swing compared to the first driver stage. This dynamic adjustment of voltage levels enables the circuit to adapt to different operating conditions, improving flexibility and power efficiency while maintaining ease of implementation through the staged architecture.
2Ease of manufacture
If fixed voltage swing is used in row driver circuits, then ease of implementation is improved, but power consumption increases
Solution Approach 1:
The row driver circuit is divided into two independent driver stages: a first driver stage that outputs signals with a first voltage swing, and a second driver stage that outputs signals with a second voltage swing. This segmentation allows each stage to operate with different voltage characteristics, enabling the circuit to maintain simple implementation while achieving flexible voltage control for power efficiency optimization.
Solution Approach 2:
The patent implements dynamic voltage swing control by allowing the second driver stage to operate with a reduced voltage swing compared to the first driver stage. This dynamic adjustment of voltage levels enables the circuit to adapt to different operating conditions, improving flexibility and power efficiency while maintaining ease of implementation through the staged architecture.
3Use of energy by moving object
If reduced voltage swing is implemented, then power consumption is reduced, but circuit complexity increases
Solution Approach 1:
The row driver circuit is divided into two independent driver stages: a first driver stage that outputs signals with a first voltage swing, and a second driver stage that outputs signals with a second voltage swing. This segmentation allows each stage to operate with different voltage characteristics, enabling the circuit to maintain simple implementation while achieving flexible voltage control for power efficiency optimization.
Solution Approach 2:
The patent employs a universal two-stage driver stage architecture that can be replicated across multiple row drivers in the display device. Each stage uses similar circuit topologies with bootstrapping capacitors and transistors, allowing the reduced voltage swing functionality to be implemented consistently throughout the system without proportionally increasing overall complexity.
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 provides enhanced flexibility in power supply bias levels, reduces voltage swing, and minimizes power consumption while balancing stress on display pixels, improving the operational efficiency of organic-light-emitting diode displays.
Implementation Method 1
The first driver stage may include a first transistor and a bootstrapping capacitor connected across the gate and source terminals of the first transistor
Data Source
AI summary
A display is provided that includes an array of display pixels that receive data signals from display driver circuitry and that receive control signals from gate driver circuitry. The gate driver circuitry may include a chain of row driver circuits. Each row driver circuit in the chain of row driver circuits may include a master driver stage, a slave driver stage, and associated control circuitry configured to receive a clock signal and a pulse signal from a preceding row driver in the chain. The master driver stage may be biased using fixed nominal power supply voltages, whereas the slave driver stage may be biased using dynamically adjustable power supply voltages that are optionally reduced relative to that of the nominal power supply voltages. One or more of the master and slave driver stages may be a bootstrapping driver stage having a bootstrapping capacitor.