RAM-less Display Driver Power Reduction via Static Image Masking
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Solution Overview
Problem
Current RAM-less display driving apparatuses face high digital current consumption due to continuous data transmission, which exceeds analog current consumption in some applications, necessitating a reduction in power consumption.
Innovation Solution
A display driving apparatus and method that includes a signal transmission interface, timing control circuit, and image detection circuit to determine if video image data is static, entering a power saving mode by masking parts of the data and disabling certain circuits to reduce digital current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous data transmission is used in RAM-less display driving apparatus, then the display panel can normally display video images, but digital current consumption becomes excessively high
Solution Approach 1:
The patent implements periodic transmission of video image data by the host, with the display driving apparatus transmitting data only at specific intervals rather than continuously. The apparatus includes a transmission control circuit that manages periodic data transmission timing, reducing digital signal activity and thereby lowering digital current consumption while maintaining normal display operation through synchronized periodic updates
Solution Approach 2:
The patent uses a frame buffer to preliminarily store video image data before transmission. The host writes video image data to the frame buffer in advance, and the display driving apparatus reads and transmits the data periodically from the frame buffer. This preliminary storage action eliminates the need for continuous host-to-display data transmission, significantly reducing digital current consumption while ensuring reliable display operation
2Productivity
If the host continuously transmits video image data, then the display can be updated in real-time, but the power consumption of the display driving apparatus increases significantly
Solution Approach 1:
The system transitions from continuous real-time updates to periodic updates at optimized intervals. The transmission control circuit manages data transmission at specific periods rather than continuously, reducing the frequency of digital signal transmissions and thereby lowering power consumption while maintaining acceptable display update rates for the application
Solution Approach 2:
The frame buffer acts as an intermediary between the host and the display driving apparatus. The host writes data to the frame buffer at its own pace, and the display driving apparatus reads and transmits data periodically from the frame buffer. This intermediary storage mechanism decouples the host's data generation rate from the display's update rate, enabling periodic transmission that reduces power consumption while maintaining display productivity
Data Source
AI summary
A display driving apparatus including a receiver circuit, a detection circuit and a driving circuit is provided. The receiver circuit receives the video image data at a first rate. The detection circuit is coupled to the receiver circuit. The detection circuit detects whether the video image data is a static image, and determines whether the display driving apparatus enters a power saving mode based on a detecting result. The driving circuit is coupled to the receiver circuit. The driving circuit drives the display panel. In the power saving mode, the receiver circuit continuously receives the video image data at the first rate, and periodically masks a part of the video image data according to the detecting result and outputs an unmasked part of the video image data to the driving circuit. Furthermore, a display driving method adapted for the foregoing display driving apparatus is also provided.