Display Drive Circuit Power Optimization via Frame Change Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display drive circuits face increased power consumption due to image processing for still images, particularly because they require additional frame memory to determine if an image is still or moving, which is costly and inefficient in terms of chip area.
Innovation Solution
A display drive circuit that generates image data-conversion and backlight control parameters based on image brightness distribution, allowing it to stop unnecessary processing when no change in image data is detected, without the need for additional frame memory, by using built-in RAM and detection circuits to manage parameter generation and image conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional frame memory is added to determine still or moving images, then image processing capability is improved, but chip area cost increases
Solution Approach 1:
The built-in RAM serves multiple functions: it stores image data for processing, acts as a frame memory for comparison, and enables both still image detection and moving image processing. This multi-functional use eliminates the need for separate dedicated frame memory circuits, reducing chip area while maintaining full image processing capability.
2Reliability
If image processing is continuously performed for all frames, then image quality is maintained, but power consumption increases during still image display
Solution Approach 1:
The display drive circuit dynamically adjusts its processing mode based on detected image characteristics. When still images are detected, the circuit switches to a low-power mode that skips redundant processing while maintaining display quality. For moving images, full processing is restored. This dynamic adaptation optimizes power consumption without compromising image quality in either mode.
Solution Approach 2:
The circuit uses feedback from image data comparison to control processing operations. By comparing current frame data with previous frame data stored in RAM, the system receives feedback about image changes and adjusts processing accordingly - reducing processing for still images while maintaining it for moving images, thus optimizing power usage based on actual image content.
3Use of energy by moving object
If parameter generation is stopped for still images, then power consumption is reduced, but display disturbances like flicker may occur
Solution Approach 1:
The system performs preliminary detection of still images by comparing frame data before deciding to stop parameter generation. This preliminary action ensures that parameter generation is only stopped when truly safe to do so, preventing display disturbances. The built-in RAM enables this preliminary comparison without additional memory cost, allowing confident power optimization.
Data Source
AI summary
A circuit apparatus is provided for driving source electrodes of a display panel based on image data and to control a backlight of the display panel. For example, the circuit apparatus includes a display drive (DD) circuit having a parameter generation (PG) part and an image data conversion (IDC) part. The PG part is operable to generate an image data-conversion parameter and a backlight control parameter based on a brightness distribution of the image data of one frame. The IDC part is operable to convert the image data based on the image data-conversion parameter. The DD circuit is operable to output source signals generated based on the converted image data and output, control the backlight based on the backlight control parameter, and stop an action of the parameter generation part in response to no change in the image data of one frame from image data of a preceding frame being detected.