Display Data Driver Circuit for Rapid Voltage Response
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Solution Overview
Problem
In display devices, if the data voltages do not rapidly change in response to changes in the first or second power voltage for pixels, it can result in the display of undesired horizontal lines on the screen.
Innovation Solution
The display device incorporates a data driver with a first amplifier, a first booster circuit, a second amplifier, a resistance string, a digital-analog converter, and a source amplifier to rapidly adjust data voltages in response to changes in the power voltages, ensuring that gamma voltages corresponding to gray scales are accurately generated and applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the data driver uses a simple voltage supply circuit, then the device complexity is reduced, but the data voltage cannot rapidly follow changes in power voltage, causing horizontal lines to appear on the display screen
Solution Approach 1:
The data driver is divided into multiple functional modules: a first amplifier for generating reference voltage, a first booster circuit for rapid voltage adjustment, a resistance string for gamma voltage generation, a digital-analog converter for gray scale conversion, and a source amplifier for final data voltage output. This segmentation allows each module to specialize in specific tasks, enabling rapid response to power voltage changes while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The first amplifier and first booster circuit proactively generate and adjust reference voltages before they are needed by subsequent stages. When power voltage changes, the first amplifier immediately detects the change and the booster circuit pre-adjusts the reference voltage, ensuring that downstream circuits (resistance string, DAC, source amplifier) receive the correct voltage levels without delay, thus preventing horizontal line artifacts
2Reliability
If the data driver rapidly adjusts data voltages to follow power voltage changes, then image quality is maintained without horizontal lines, but the device complexity increases due to additional amplifier and booster circuit components
Solution Approach 1:
The first booster circuit is designed with dynamic characteristics that enable rapid voltage adjustment in response to power voltage changes. The circuit uses transistors configured to provide high-speed voltage followers that can quickly track and replicate voltage changes, ensuring that the reference voltage dynamically adapts to power supply variations. This dynamic design maintains display reliability by preventing horizontal lines while the modular architecture keeps the increased complexity manageable
Solution Approach 2:
The first amplifier and first booster circuit form a feedback-controlled subsystem that continuously monitors power voltage changes and automatically adjusts the reference voltage accordingly. This feedback mechanism ensures that any deviations in power voltage are immediately compensated, maintaining stable operation of the entire data driver and preventing display artifacts, thereby improving reliability without requiring manual intervention or complex external control
Data Source
AI summary
A display device includes: a pixel which emits light at a luminance corresponding to a data voltage applied thereto; and a data driver which supplies the data voltage to the pixel. The data driver includes: a first amplifier which outputs a first reference voltage; a first booster circuit including an input terminal connected to a first input terminal of the first amplifier, and an output terminal connected to a second input terminal of the first amplifier; a second amplifier which outputs a second reference voltage; a resistance string which receives the first and second reference voltages, and generate gamma voltages which are intermediate voltages between the first and second reference voltages; a digital-analog converter which outputs a gamma voltage corresponding to a gray scale of the pixel among the gamma voltages; and a source amplifier which outputs the gamma voltage as the data voltage.