Display Data Driver Slew Rate Control via Bias Voltage
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Solution Overview
Problem
Display devices, particularly those with high image quality, light weight, and low power consumption, face significant power consumption due to large output current and signal swing width in data drivers, which is not efficiently managed by existing technologies.
Innovation Solution
A display device with a data driver that applies a data signal to a display unit and controls the slew rate of the signal based on a bias voltage, adjusted by a bias controller according to luminance variations across different division areas, reducing power consumption by optimizing bias voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the data driver supplies large output current with large signal swing width to maintain image quality, then image display quality is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamic control of the bias voltage to the data driver circuit, allowing the slew rate of the data signal to be adjusted in real-time based on actual image content requirements. The bias controller dynamically modifies the bias voltage level to optimize the trade-off between signal quality and power consumption, rather than using a fixed high slew rate configuration.
Solution Approach 2:
The patent changes the bias voltage parameter of the data driver to control the slew rate of the data signal. By adjusting this electrical parameter, the system can optimize power consumption while maintaining adequate signal quality for different image content scenarios.
2Speed
If the data driver uses high slew rate to ensure fast signal transmission and image quality, then signal transmission speed is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the data driver's bias voltage based on actual transmission needs. The bias controller monitors and adjusts the bias voltage to achieve the minimum necessary slew rate for acceptable signal quality, reducing power consumption while maintaining adequate transmission speed.
Solution Approach 2:
The patent modifies the bias voltage parameter to control the slew rate, allowing the system to optimize the balance between signal transmission speed and power consumption by changing this key electrical parameter.
3Adaptability or versatility
If the data driver maintains high output current capability to handle various image data scenarios, then adaptability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamic bias voltage control that adapts to different image content scenarios. The bias controller adjusts the bias voltage in real-time based on the actual luminance variation requirements, allowing the data driver to maintain adaptability for various image data while consuming power only when and to the extent necessary.
Data Source
AI summary
A display device includes: a display unit including a plurality of pixels and a plurality of division areas; a data driver configured to apply a data signal corresponding to image data to the display unit, and to control a slew rate of the data signal, based on a bias voltage; and a bias controller configured to control the data driver so that the slew rate of the data signal is changed for each division area, based on a luminance variation of the image data corresponding to each of the division areas.