Source Driver IC Cascade Sensing Data Transmission
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Solution Overview
Problem
In OLED display devices, the varying physical length at which source driver ICs are disposed on the panel leads to different transmission times for sensing data, causing difficulties for the timing controller to process the data uniformly.
Innovation Solution
A source driver IC that can selectively output sensing data received from previous ICs or self-sensing data in response to control commands, allowing a single IC to receive and manage sensing data from multiple ICs, thereby simplifying data transmission and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each source driver IC transmits sensing data directly to the timing controller through separate connections, then the timing controller can receive sensing data from all source driver ICs, but the number of wires increases and phase matching becomes difficult
Solution Approach 1:
Multiple source driver ICs are connected in a cascade manner where intermediate source driver ICs transmit sensing data to adjacent ICs rather than directly to the timing controller. This merging approach consolidates multiple data transmission paths into a single unified path through the first source driver IC to the timing controller, reducing wire complexity while maintaining data integrity
Solution Approach 2:
The first source driver IC acts as an intermediary that receives sensing data from other source driver ICs and forwards it to the timing controller. This mediator role eliminates the need for direct connections from each source driver IC to the timing controller, significantly reducing the number of wires required
2Loss of information
If each source driver IC transmits sensing data directly to the timing controller, then complete sensing data is received, but phase matching becomes difficult due to different physical lengths
Solution Approach 1:
The cascade connection structure equalizes the transmission path length for all sensing data by routing it through the same physical path (through the first source driver IC). This creates equipotential conditions where all sensing data experiences similar transmission characteristics, eliminating phase matching issues that would arise from different physical lengths
3Device complexity
If a cascade connection is used among source driver ICs, then wire complexity is reduced, but the transmission path length increases
Solution Approach 1:
The data transmission system is segmented into functional units where each source driver IC processes and transmits data to adjacent ICs in the cascade. This segmentation allows the transmission path to be divided into manageable segments, reducing the burden on any single connection while maintaining overall system efficiency
Data Source
AI summary
Provided are a source driver integrated circuit (IC) according to the present disclosure including a first buffer in which first sensing data transmitted from a first source driver IC is stored, a sensing data generation circuit configured to sense a characteristic of a driving element included in each pixel and generate second sensing data, a second buffer in which the second sensing data is stored, a control circuit configured to generate a selection signal in response to an operation command, and a selector configured to transmit one of the first sensing data stored in the first buffer and the second sensing data stored in the second buffer to a second source driver IC in response to the selection signal.