Display Driver Output Buffer Defect Detection and Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display malfunctions due to defects in output buffers, which existing display drivers fail to effectively address, leading to issues like line dimming and abnormal column lines.
Innovation Solution
Incorporating a dummy buffer and detection/switching circuits to detect defective output buffers and switch to either a dummy or adjacent buffer to ensure continuous signal output, thereby resolving display failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If output buffers are used to output source signals in a display driver, then the display driver can provide display data through multiple channels, but defects in output buffers may occur during use causing display malfunctions such as line dimming and abnormal column lines
Solution Approach 1:
The patent applies preliminary action by pre-configuring dummy buffers alongside the main output buffers before any defects occur. These dummy buffers are prepared in advance as standby units, and the detection circuit is pre-established to monitor output buffer states. When a defect is detected, the system can immediately switch to the pre-prepared dummy buffer without interruption, thus resolving the contradiction between maintaining high productivity and ensuring reliability.
Solution Approach 2:
The patent implements beforehand cushioning by introducing redundant dummy buffers that serve as protective backups against potential output buffer failures. This cushioning mechanism ensures that even if a defect occurs during operation, the display driver can seamlessly transition to the backup buffer, preventing display malfunctions and maintaining continuous operation, thereby balancing productivity and reliability.
2Reliability
If detection circuits and switching circuits are added to detect and switch between output buffers, then display failures can be resolved, but the device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a detection circuit as a mediator between the output buffers and the display panel. This detection circuit monitors the health status of output buffers and triggers switching operations when defects are detected. Additionally, a switching circuit acts as an intermediary to route signals between multiple buffers (including dummy buffers) and the display panel. These intermediary circuits add complexity but enable automatic defect detection and correction, significantly improving reliability while keeping the added complexity manageable through modular design.
Solution Approach 2:
The patent applies copying by creating dummy buffers that are identical copies of the main output buffers. These dummy buffers replicate the functional structure and signal processing capabilities of the original buffers. By having these copied backup units, the system can switch to a functional copy when the original buffer fails, ensuring continuity of operation. This copying strategy improves reliability by providing ready-made replacements without requiring complex reconstruction logic.
3Reliability
If dummy buffers are used instead of defective output buffers, then display failure can be resolved, but the quantity of buffers increases
Solution Approach 1:
The patent applies parameter changes by dynamically altering the operational state of buffers based on detected defect conditions. When a defect is detected in an output buffer, the system changes the operational parameters by switching from the defective buffer to a dummy buffer. This parameter change approach allows the system to maintain the same functional output capability while changing which physical buffer is active, thereby resolving display failures without permanently increasing the operational buffer count beyond the initial redundant configuration.
Data Source
AI summary
Various embodiments disclose a display driver, wherein the display driver may be configured to detect a defective output buffer among output buffers and perform an output correction function for the defective output buffer.