Display Driver Image Shifting Power Reduction
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Solution Overview
Problem
Display devices experience increased power consumption when shifting images due to the host processor's need to generate and transmit input image data for each frame, especially in modes that require frequent image updates.
Innovation Solution
A display device and method that include a display driver capable of updating position information within the frame memory during a frame period without receiving new input image data, allowing the image to be shifted based on stored data signals, and a host processor that outputs image position control signals to manage image updates in both moving and still image modes, reducing power consumption by minimizing data transmission and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the host processor generates and transmits input image data for each frame to shift the image, then the image shifting function is achieved, but power consumption increases
Solution Approach 1:
The patent extracts the image shifting function from the host processor and relocates it to the display driver. The host processor only transmits the original image data, while the display driver independently performs the shifting operation using its internal memory and control logic, thereby reducing the host processor's power consumption while maintaining the image shifting capability
Solution Approach 2:
The display driver acts as an intermediary between the host processor and the display panel. It receives the original image data from the host processor, performs the shifting operation using its frame memory and control circuits, and then outputs the shifted image data to the display panel, eliminating the need for the host processor to generate shifted data for each frame
2Productivity
If new input image data is transmitted for each frame, then image update is achieved, but data transmission and processing overhead increases
Solution Approach 1:
The display driver performs preliminary actions by maintaining the original image data in its frame memory and pre-configuring the shifting logic. When an image shift is needed, it simply activates the shifting function using the already-stored data, avoiding the need for the host processor to generate and transmit new shifted data for each frame
Solution Approach 2:
The system uses periodic frame synchronization signals to trigger image shifts only when necessary. The display driver updates the image position at specific frame intervals based on control signals from the host processor, rather than continuously transmitting new data for every frame, thereby reducing data transmission overhead while maintaining smooth image updates
Data Source
AI summary
A display device includes a display driver configured to generate a data signal based on input image data, and a display panel configured to display an image in a display area based on the data signal. The input image data includes position information of the image, the display driver updates at least a portion of the position information included in the input image data corresponding to at least a partial area of the display area and provides the data signal including an updated position information during a frame period in which no new input image data is received, and the image corresponding to the partial area is updated in the display area based on the updated position information during the frame period.