OLED Display Interface Device for External Compensation
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Solution Overview
Problem
OLED display devices face nonuniformity in luminance due to deviations in driving characteristics of drive TFTs, requiring external compensation, and need an encrypted transmission system for communication between separated circuit configurations while efficiently transmitting sensing data for compensation.
Innovation Solution
An interface device using an encrypted transmission protocol with a high definition multimedia interface (HDMI) and transition minimized differential signaling (TMDS) scheme, allowing for efficient transmission of sensing data by altering the frequency and phase of vertical synchronization signals to overlap sensing periods with blank periods of other channels, enabling external compensation without frequency increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encrypted transmission system is used for communication between the display module and the separated control module, then content protection is improved, but transmission efficiency of sensing data deteriorates
Solution Approach 1:
The transmission system is segmented into multiple channels (first channel and second channel) that can operate independently. Sensing data is transmitted through one channel while encrypted pixel data is transmitted through another channel, allowing parallel transmission without interference and maintaining both security and efficiency.
Solution Approach 2:
The system uses periodic transmission periods including active periods for pixel data and blank periods for sensing data. By utilizing the blank periods (which occur periodically during horizontal or vertical blanking intervals) for sensing data transmission, the system achieves efficient data transfer without interfering with the main pixel data transmission.
2Productivity
If sensing data is transmitted during active periods, then transmission efficiency is improved, but pixel data transmission accuracy deteriorates
Solution Approach 1:
The transmission system alternates between active periods for pixel data and blank periods for sensing data. This periodic switching ensures that pixel data is transmitted during active periods when the display is actively showing content, while sensing data is transmitted during blank periods when no pixel data is being displayed, thus maintaining both transmission efficiency and pixel data accuracy.
3Volume of moving object
If the control module is externally separated from the display module, then display module slimness is improved, but communication complexity increases
Solution Approach 1:
The transmission interface is designed to handle multiple types of data (pixel data and sensing data) through a unified protocol that operates over the same physical connection. This multi-functional interface reduces the need for separate communication channels and simplifies the overall communication architecture despite the physical separation of modules.
Data Source
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AI summary
An organic light emitting diode (OLED) display device is discussed. The OLED display device includes a display module including a display panel and a panel driver for driving the display panel, and a host system externally separated from the display module. The OLED display device further includes an interface device including a transmission module configured to transmit sensing data via a plurality of vertical synchronization signals for communication between the host system and the display module. The transmission module generates first and second vertical synchronization signals having blank periods that are not overlapping with each other. The interface device transmits the sensing data in a sensing period of one vertical synchronization signal that overlaps with the blank period of another vertical synchronization signal.