Analog Video Transport in Mobile Devices for Simpler Display Interfaces
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Solution Overview
Problem
The existing video transport within mobile devices faces performance-scaling bottlenecks due to increased camera and display resolutions, leading to higher costs and power consumption, particularly with the use of hybrid digital/analog display driver integrated circuits (DDICs) that require numerous digital-to-analog converters (DACs) and complex digital interfaces.
Innovation Solution
Transporting video signals as analog samples instead of digital, using novel video transports that encode or unencode analog samples, and integrating the timing controller functionality of the DDIC into the system-on-chip (SoC), eliminating the need for digital-to-analog converters in the DDIC and simplifying connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital video transport interfaces (MIPI CSI/DSI) are used, then video can be transmitted between components, but the system becomes more complex and consumes more power as resolution and frame rate increase
Solution Approach 1:
The patent replaces the digital signal transmission mechanism with an analog signal transmission mechanism. Instead of using digital interfaces (MIPI CSI/DSI) that require complex timing controllers and data converters, the invention uses analog video transport where pixel data is transmitted as continuous voltage signals directly from the image sensor to the display, eliminating the need for digital processing stages in the transport path.
Solution Approach 2:
The patent changes the fundamental parameter of signal representation from discrete digital values to continuous analog values. By transmitting video data as analog signals rather than digital signals, the system achieves simpler interfaces with fewer wires and no need for complex digital-to-analog converters in the display driver, while maintaining the ability to support high resolutions and frame rates.
2Ease of operation
If digital-to-analog converters are included in the display driver IC, then analog video can be displayed, but the chip becomes more complex and costly
Solution Approach 1:
The patent extracts the digital-to-analog conversion function from the display driver IC by using an external analog video transport interface. Instead of requiring DACs integrated within the DDIC chip, the system receives already-converted analog video signals from the image sensor through dedicated analog transport circuits, removing the need for complex DAC arrays in the display driver.
Solution Approach 2:
The patent introduces an intermediate analog video transport layer between the image sensor and the display driver. This intermediate layer handles the conversion and transmission of video data as analog signals, acting as a mediator that eliminates the need for direct digital-to-analog conversion within the display driver IC itself.
3Adaptability or versatility
If multiple high-resolution cameras are added, then dynamic range and depth sensing improve, but the video transport burden increases
Solution Approach 1:
The patent applies analog video transport to replace digital transport for multiple camera inputs. By using analog signal transmission for each camera's video data, the system can handle multiple high-resolution cameras without the exponential complexity increase that would result from using multiple digital interfaces, as analog transport requires significantly fewer wires and processing resources.
Data Source
AI summary
Video samples from a camera or cameras of a mobile device are sent as analog levels to a system-on-chip (SoC) or other processor of the device. The analog levels are the analog video samples or be an encoded form of the video samples. The samples are converted to digital and interpolated within the SoC to produce digital RGB samples suitable for display. Or, the analog video samples are interpolated within the SoC using analog processing to produce analog RGB samples. Or, only the G samples are transmitted to the SoC, and processed using analog processing. After processing within the SoC, the samples are sent as analog levels or in encoded form to a corresponding receiver of a display integrated with column drivers. Digital functionality of the DDIC of the display is moved into the SoC or into circuitry separate from, and connected to, the SoC via an MIPI DSI interface.