Display Driver Frame Region Refresh via Image Data
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Solution Overview
Problem
Existing drivers for display panels require complex instructions and increased load on the host controller due to the need to repeatedly designate addresses for frame region refresh processing, especially when dealing with noise-resistant environments like on-vehicle displays.
Innovation Solution
A driver with a control unit that simplifies frame write processing by using image region information to specify the frame region, allowing for automatic refresh of the frame region without explicit address designation, and enabling refresh processing at predetermined intervals using an enable signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the driver uses explicit address designation for frame region refresh processing, then the frame region can be accurately specified, but the instruction complexity and host controller load increase
Solution Approach 1:
The driver performs frame write processing automatically using image region information that is already stored from previous operations. The system serves itself by reusing existing data to determine frame region boundaries, eliminating the need for complex host controller instructions while maintaining accurate frame region specification
Solution Approach 2:
Image region information is obtained in advance and stored in the driver before frame write processing is needed. This preliminary acquisition of boundary information allows the driver to automatically perform frame refresh without requiring real-time address designation from the host controller, reducing instruction complexity while preserving specification accuracy
2Productivity
If the host controller repeatedly designates addresses for frame region refresh, then the frame region can be updated, but the host controller load increases
Solution Approach 1:
The driver autonomously performs frame write processing by utilizing stored image region information, eliminating the need for the host controller to repeatedly issue address designation commands. This self-service mechanism maintains frame refresh productivity while eliminating host controller waiting time
Solution Approach 2:
The driver continuously performs frame write processing at predetermined intervals using the enable signal, maintaining uninterrupted frame region refresh capability. This continuous operation achieves productivity goals without requiring intermittent host controller intervention, thereby eliminating waiting time losses
3Reliability
If frame write processing is performed at high frequency, then noise resistance is improved, but collision with data writing operations may occur
Solution Approach 1:
Frame write processing is performed at predetermined intervals controlled by the enable signal, providing periodic refresh that maintains noise resistance. This periodic timing ensures stable operation scheduling by preventing collisions with data writing operations, as the fixed intervals allow proper coordination between frame refresh and data update operations
Data Source
AI summary
A driver includes a display memory that stores display data, and a control unit that writes the display data in the display memory. The control unit accepts image region information for designating an image region in which an image corresponding to the display data is to be displayed within a display region of a display panel, and instruction information for giving an instruction to display of a frame region which surrounds the image region in the display region, and performs frame write processing for writing given tone data at an address of the display memory corresponding to the frame region, based on the image region information.