Display Driver Synchronization Without Frame Buffer Memory
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Solution Overview
Problem
Display drivers in display devices often experience synchronization issues with application processors, leading to reduced image quality, increased size and cost due to memory requirements, and high power consumption, especially at high refresh rates.
Innovation Solution
A display driver design that includes a receiver and a controller, utilizing separate channels for data and synchronization signals, with a calibration circuit to correct synchronization errors, eliminating the need for memory devices and enabling accurate synchronization without frame buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a memory device is added to aid synchronization, then synchronization accuracy is improved, but chip size and manufacturing cost increase
Solution Approach 1:
The patent extracts and removes the memory device from the display driver system. Instead of using internal memory to store image data for synchronization, the system uses a separate synchronization signal channel transmitted from the application processor to the display driver, eliminating the need for memory components while maintaining synchronization accuracy.
Solution Approach 2:
The patent introduces a synchronization signal as an intermediary mechanism. This separate signal channel acts as a mediator between the application processor and display driver, conveying timing information without requiring data storage, thus resolving the contradiction between synchronization reliability and chip size.
2Productivity
If the display driver is driven at high-speed such as 120 Hz or more, then refresh rate is improved, but power consumption increases greatly
Solution Approach 1:
The patent implements periodic transmission of synchronization signals at the required refresh rate (120 Hz or higher). By using periodic signaling rather than continuous data transmission and processing, the system achieves high refresh rates while minimizing power consumption through idle states between periodic updates.
3Measurement precision
If the resolution of display panel is increased, then display quality is improved, but size of display driver needs to be increased making it more difficult to drive the display panel
Solution Approach 1:
The patent extracts the data storage function from the display driver by removing the memory device. This allows the display driver to maintain a compact size while supporting high-resolution displays, as the driver only needs to process incoming data in real-time without requiring internal storage capacity proportional to display resolution.
Data Source
AI summary
A includes a receiver and a controller. The receiver receives data through a first channel. The controller receives a first synchronization signal including a periodic signal through a second channel different from the first channel and outputs a data signal based on the data and the first synchronization signal.