Display Data Driver Bias Control for High-Resolution Power Reduction
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Solution Overview
Problem
As the resolution of display panels increases, the 1H time shortens, leading to increased bias current in buffers, which in turn raises power consumption in display apparatuses, compromising both power efficiency and display quality.
Innovation Solution
A data driver that compares previous line data and present line data to adjust buffer parameters, specifically the bias current, to reduce power consumption while maintaining high display quality, incorporating a digital to analog converter, buffer, and buffer controller to optimize buffer operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel is increased, then the display quality is improved, but the 1H time is shortened and the bias current of the buffer increases leading to higher power consumption
Solution Approach 1:
The buffer controller dynamically adjusts the bias current of the buffer based on the difference between previous line data and present line data. When the data difference is small, the bias current is reduced; when the data difference is large, the bias current is increased. This dynamic adjustment allows the system to maintain display quality at high resolution while reducing power consumption during periods of low data variation.
Solution Approach 2:
The invention changes the bias current parameter of the buffer based on the calculated difference between previous and present line data. By varying this electrical parameter according to actual data changes, the system adapts to different operating conditions, maintaining performance while optimizing power consumption.
2Speed
If the bias current of the buffer is increased to transmit data voltage within the shortened 1H time, then the data transmission speed is improved, but the power consumption of the display apparatus increases
Solution Approach 1:
The buffer operates with dynamically adjusted bias current rather than a fixed high current. The buffer controller continuously monitors data changes and adjusts the bias current in real-time, allowing the buffer to transmit data at required speeds only when necessary, rather than maintaining maximum speed continuously.
Solution Approach 2:
The buffer bias current is adjusted periodically based on each line of data processing. The buffer controller calculates the data difference for each line and adjusts the bias current accordingly, creating a periodic adjustment pattern that matches the display refresh cycle.
Data Source
AI summary
A data driver includes a digital to analog converter, a buffer and a buffer controller. The digital to analog converter is configured to receive a data signal having a digital type and to convert the data signal into a data voltage having an analog type. The buffer is configured to buffer the data voltage and to output the data voltage. The buffer controller is configured to determine a parameter of the buffer based on previous line data of the data signal and present line data of the data signal.