Display Driver Black Mode for Constant-Current Power Reduction
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Solution Overview
Problem
High power consumption in display apparatuses due to constant current flow through amplifiers of the gamma reference voltage generator and data driver, especially when displaying black images.
Innovation Solution
Implementing a gamma reference voltage generator and data driver that operate in a black mode when displaying a black image, turning off the bias voltage applier and amplifiers to reduce constant current, and using hold voltage during black periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bias voltage applier and amplifier operate continuously to provide data voltage, then the display apparatus can display images normally, but the power consumption increases due to constant current flow
Solution Approach 1:
The patent implements periodic action by switching between normal mode and black mode based on image content. During black periods, the bias voltage applier and amplifier are turned off to reduce power consumption, while during normal periods they operate to maintain display function. This periodic switching resolves the contradiction between continuous operation reliability and energy efficiency.
Solution Approach 2:
The system dynamically adjusts its operation mode based on real-time detection of image content. The controller determines whether to operate in normal mode or black mode by analyzing image data, enabling the bias voltage applier and amplifier to adapt their power consumption levels according to actual display requirements, thus resolving the static contradiction between continuous operation and energy saving.
2Use of energy by moving object
If the gamma reference voltage generator and amplifier are turned off during black image display, then power consumption is reduced, but the display apparatus cannot respond quickly when switching to normal images
Solution Approach 1:
The patent applies preliminary action by maintaining the operational state of the gamma reference voltage generator and amplifier during black mode. Instead of completely shutting down these components, the system keeps them in a low-power ready state that allows rapid transition back to normal operation when needed, thus resolving the contradiction between power saving and response speed.
3Use of energy by moving object
If switches are used to connect hold voltage during black periods, then power consumption is reduced by blocking amplifier output, but the device complexity increases
Solution Approach 1:
The patent implements universality by designing switches that serve multiple functions: they act as normal signal path components during normal operation and as power-saving blocking elements during black periods. This multi-functionality allows the same switch mechanism to resolve the contradiction between power consumption reduction and device complexity by eliminating the need for separate control mechanisms.
Data Source
AI summary
A display apparatus includes: a gamma reference voltage generator, a digital-to-analog converter, an amplifier and a bias voltage applier. The gamma reference voltage generator is configured to generate a gamma reference voltage. The digital-to-analog converter is configured to convert a data signal to a data voltage based on the gamma reference voltage. The amplifier is configured to receive the data voltage from the digital-to-analog converter and to output the data voltage to a data line. The bias voltage applier is configured to output a first bias voltage to the gamma reference voltage generator and to output a second bias voltage to the amplifier. The bias voltage applier is turned off while input image data have a black image.