Source Driver LVDS Checksum Error Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices using active matrix driving, existing methods struggle to quickly detect and visually present communication abnormalities during video data transmission via low voltage differential signaling (LVDS), as they require synchronization between video data and CRC code transmission, which is not feasible, leading to difficulties in handling dynamic display content and responding to sudden noises.
Innovation Solution
A display device configuration that includes a source driver capable of receiving video data via LVDS, calculating and comparing checksum values within each data packet, and visually indicating communication errors by assigning an arithmetic value to an empty region in the data packet, allowing for real-time detection and presentation of abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CRC codes are transmitted through a separate interface (I2C) for abnormality detection, then the detection can be performed, but the response time is delayed and synchronization with video data transmission cannot be achieved
Solution Approach 1:
The patent merges the CRC code transmission with the LVDS video data transmission by utilizing the empty region in the LVDS data packet. Instead of using a separate I2C interface for CRC transmission, the checksum code is embedded within the same data packet structure that carries video data, enabling simultaneous transmission of both video data and error detection information through the single LVDS interface.
Solution Approach 2:
The patent utilizes the empty region (dimensional space) within the LVDS data packet structure to accommodate the checksum code. By identifying and utilizing this unused dimensional space in the data packet, the system achieves additional functionality (error detection) without requiring additional transmission channels or increasing transmission time.
2Adaptability or versatility
If video data transmission and CRC code transmission are not synchronized, then separate interfaces can be used, but dynamic display content cannot be handled and only fixed display area data can be determined
Solution Approach 1:
The patent combines video data transmission and checksum transmission into a single synchronized process by embedding the checksum in the same data packet structure. This unified approach naturally synchronizes both transmissions, enabling the system to handle dynamic display content effectively without complex synchronization mechanisms between separate interfaces.
3Reliability
If abnormality detection is performed after receiving complete video data for a frame, then detection can be completed, but sudden noises cannot be responded to quickly
Solution Approach 1:
The patent performs preliminary action by calculating and transmitting the checksum code along with the video data itself, rather than waiting until the complete frame is received. This allows the source driver to perform abnormality detection in real-time during the data reception process, enabling immediate response to sudden noises or transmission errors without waiting for frame completion.
Data Source
AI summary
A display device includes a display panel, a gate driver; a source driver, supplying gradation voltage signals to multiple pixel parts via multiple data lines based on a video data signal, and supplying to the gate driver a gate control signal; and a video data transmission part, transmitting the video data signal to the source driver by using LVDS. The video data transmission part assigns, to an empty region that is a region other than regions assigned to multiple pixel data pieces forming one pixel of the video data signal in each data packet defined for a time of transmitting the video data signal for one pixel by using LVDS, an arithmetic value calculated based on the pixel data pieces, and transmits to the source driver together with the pixel data pieces as the video data signal.