Host Display Driver Interface Mode Switching
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Solution Overview
Problem
Existing display protocols for portable electronic devices, such as MIPI, face inefficiencies in power consumption when displaying still images, either through continuous data transmission in video mode or high manufacturing costs due to large frame buffers in command mode.
Innovation Solution
An electronic device and method that allow a host to transmit mode change signals through a separate interface from MIPI, enabling the display driver IC to switch between video and virtual control modes, optimizing power usage and reducing frame buffer capacity by storing still image data for Always on Display (AoD) in a smaller frame buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video mode is used to display still images, then real-time image transmission is achieved, but power consumption increases due to repeated transmission of the same image
Solution Approach 1:
The patent implements command mode operation where image data is transmitted periodically rather than continuously. The host controller transmits still image data only when needed, and the display driver IC reads and displays the image from its internal frame buffer without requiring continuous data transmission from the host, thereby reducing power consumption while maintaining display functionality.
Solution Approach 2:
The display driver IC pre-loads still image data into its frame buffer before display is needed. This preliminary action allows the image to be stored locally and displayed without requiring repeated real-time transmission from the host, reducing the energy burden on the host while ensuring the image is ready for display when needed.
2Use of energy by moving object
If command mode is used to display still images, then power consumption is reduced, but manufacturing cost increases due to large frame buffer capacity requirements
Solution Approach 1:
The patent implements a hybrid mode selection mechanism where command mode is used specifically for still image display (partial application) rather than for all display scenarios. This allows the system to benefit from reduced power consumption during still image display while avoiding the need for excessive frame buffer capacity that would be required if command mode were used for all display types including video.
Solution Approach 2:
The system dynamically switches between video mode and command mode based on the type of image being displayed. The host controller determines whether to transmit image data in real-time (video mode) or allow the display driver IC to read from its frame buffer (command mode), optimizing the balance between power consumption and frame buffer requirements based on current display needs.
3Adaptability or versatility
If a separate interface is added for mode change signals, then display mode switching flexibility is improved, but device complexity increases
Solution Approach 1:
The existing MIPI interface is made multi-functional by adding mode change signal capability to it. Rather than creating a completely separate interface, the patent enables the MIPI interface to carry both image data transmission and mode change control functions, reducing overall system complexity while maintaining the flexibility to switch between video mode and command mode.
Data Source
AI summary
An electronic device includes: a host configured to output image data and a timing control signal in response to an image intended to be displayed; a display driver IC coupled to the host through a first interface and a second interface and configured to output a data signal based on the image data; and a display configured to display an image based on the data signal, wherein the host is configured to output the image data and the timing control signal through any one of the first interface and the second interface depending on a display mode.