Display Device Calibration Value Backup and Recovery via Common Bus
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Solution Overview
Problem
Display devices, such as liquid crystal and organic light emitting display devices, face challenges in rapidly recovering from failure situations, particularly due to the deletion of calibration values caused by events like electrostatic discharge, which necessitates a full initialization process, disrupting normal operation.
Innovation Solution
A display device and driving method that incorporate a calibrating unit and timing controller with a common bus line for bidirectional communication, allowing for the storage and transmission of calibration values with checksums, enabling rapid recovery by checking and retransmitting values when a fast recovery request is received, thus avoiding full initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full initialization process is performed to restore calibration values after deletion, then the calibration values are restored, but the display operation is disrupted and recovery time increases
Solution Approach 1:
The timing controller performs preliminary action by storing backup calibration values in advance before they are deleted. When a calibration value is deleted from the source drive IC, the timing controller already has a backup copy ready, allowing immediate restoration without waiting for full re-initialization. This preliminary storage of backup values resolves the contradiction by enabling fast recovery while maintaining calibration accuracy.
Solution Approach 2:
The timing controller acts as an intermediary between the source drive IC and the external environment. It maintains a backup copy of calibration values and uses checksum verification to ensure data integrity during restoration. This intermediary role allows the system to recover from calibration value deletion without requiring full initialization, thus reducing recovery time while ensuring reliable restoration.
2Reliability
If calibration values are transmitted and stored bidirectionally between source drive IC and timing controller, then recovery capability is improved, but device complexity increases
Solution Approach 1:
The common bus line between the timing controller and source drive IC is designed to serve multiple functions: it transmits both calibration values and checksums bidirectionally, and can communicate with multiple source drive ICs simultaneously. This multi-functionality reduces the need for separate dedicated communication channels, thereby limiting the increase in device complexity while still achieving improved recovery capability through comprehensive calibration value management.
3Measurement precision
If checksum verification is implemented for calibration values, then data integrity is ensured, but processing time and complexity increase
Solution Approach 1:
The timing controller creates a copy of the calibration value along with its checksum and stores it in backup memory. This copying mechanism ensures that a verified backup copy is available for rapid restoration. The checksum verification is performed on the copied data rather than requiring complex real-time verification during normal operation, thus ensuring data integrity while limiting the increase in processing complexity.
Data Source
AI summary
Disclosed is a display device that can rapidly recover from a fail situation. The display device includes: a display panel; a source drive IC configured to supply a data signal to the display panel and including a calibrating unit; a timing controller configured to supply a data control signal and a frame data to the source drive IC; and a common bus line formed between the source drive IC and the timing controller. The calibrating unit sets and stores a calibration value in response to the data control signal during an initialization period before receiving the frame data from the timing controller, and transmits the calibration value to the timing controller through the common bus line.