Display Driver Compression for Constant Transmission Rate
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Solution Overview
Problem
Existing display apparatus technologies face challenges in managing changes in transmission rate of display data due to varying frame rates, which complicates anti-EMI design and requires re-locking of PLL or DLL circuits, leading to inefficiencies and increased power consumption.
Innovation Solution
A display apparatus with a compression section that adjusts data compression ratios based on frame rate to maintain a constant transmission rate, eliminating the need for re-locking PLL or DLL circuits and simplifying anti-EMI measures by keeping the transmission rate constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the frame rate is increased to reduce image blur, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic frame rate switching between 60Hz and 120Hz based on content type. Still images are displayed at 60Hz to reduce power consumption, while moving images are displayed at 120Hz to reduce blur. This dynamic adjustment resolves the contradiction by adapting the frame rate to actual display needs rather than permanently using high frame rate.
Solution Approach 2:
The patent changes the frame rate parameter from a fixed value to a variable value that can switch between 60Hz and 120Hz. This parameter change allows the system to optimize between power consumption and image quality by selecting appropriate frame rates based on content characteristics.
2Use of energy by moving object
If the frame rate is varied to optimize power consumption, then power efficiency is improved, but the transmission rate of display data changes, complicating anti-EMI design
Solution Approach 1:
The patent introduces a frame memory as an intermediary buffer between the data transmission path and the display output. The frame memory absorbs the variable data transmission rates caused by frame rate switching, allowing the transmission rate to vary while maintaining stable EMI characteristics. This mediator decouples the relationship between frame rate variation and transmission rate variation.
3Use of energy by moving object
If the frame rate is varied to reduce power consumption, then power efficiency is improved, but PLL or DLL re-locking is required, causing display interruptions
Solution Approach 1:
The patent performs preliminary actions by pre-configuring the PLL or DLL circuit to handle both 60Hz and 120Hz frame rates without requiring re-locking. The circuit is designed in advance to accommodate frame rate transitions, eliminating the need for interruptive re-locking operations and maintaining continuous display.
4Speed
If the transmission rate of display data is increased to support higher frame rates, then frame rate is improved, but the frequency range of EMI enlarges, making anti-EMI measures difficult
Solution Approach 1:
The frame memory acts as a mediator that decouples the relationship between frame rate and transmission rate. By buffering data at variable transmission rates and outputting at a constant rate, the frame memory prevents EMI frequency range expansion while still supporting high frame rates when needed.
Solution Approach 2:
The patent dynamically adjusts the frame rate based on content type rather than maintaining a constantly high transmission rate. This dynamic approach reduces the average EMI frequency range while still providing high frame rate capability when required for moving images.
Data Source
AI summary
A display apparatus includes: a display device; a display device driver which drives the display device; a compression section adapted to an operation of generating compression data by compression processing performed on image data; and a transmission section which, when receiving compressed data from the compression section, transmits the compressed data to the display device driver by using a serial data signal. The compression section performs the compression processing with a data compression ratio selected in response to a frame rate with which the display device driver drives the display device. The display device driver receives the serial data signal from the transmission section, generates decompressed data by decompressing the compressed data transmitted by the serial data signal, and drives the display device in response to the decompressed data. The data compression ratio used in the compression processing is set so that the transmission rate of the serial data signal from the transmission section to the display device driver is kept constant independently of the frame rate.