Display Device Virtual Feedback Signal Circuit for Driver Error Isolation
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Solution Overview
Problem
Display devices, particularly OLEDs, face challenges in efficiently identifying and addressing errors in data drivers, which can lead to malfunction and difficulty in troubleshooting due to the shared back channel method's limitations in distinguishing between normal and error states.
Innovation Solution
Incorporating a virtual feedback signal circuit and a switching mechanism in the timing controller to selectively connect either the shared back channel or the virtual feedback signal circuit, allowing for the substitution of input feedback signals with virtual feedback signals indicating a normal driving state, thereby enabling error detection and isolation of faulty data drivers during inspection mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the shared back channel method is used to receive feedback signals from multiple data drivers, then the device complexity is reduced and signal lines are minimized, but the ability to distinguish between normal and error states is lost, making error detection and troubleshooting difficult
Solution Approach 1:
A virtual feedback signal circuit is introduced as an intermediary component between the data drivers and the timing controller. This circuit generates virtual feedback signals that mimic normal operation signals, allowing the system to distinguish between actual error states and normal states even when using a shared back channel configuration. The virtual feedback signal acts as a mediator that enables error detection without requiring separate dedicated feedback lines for each data driver.
2Measurement precision
If a dedicated feedback channel is provided for each data driver, then error detection precision is improved, but the device complexity and number of signal lines increase
Solution Approach 1:
The virtual feedback signal circuit creates copies of normal feedback signals that are injected into the shared back channel. Instead of requiring separate physical feedback channels for each data driver, the system uses copied virtual feedback signals to represent the state of multiple data drivers on a single shared channel. This copying approach maintains error detection precision while avoiding the complexity of dedicated feedback lines for each driver.
3Ease of operation
If the shared back channel is used in inspection mode, then the ease of operation is improved, but the ability to verify faulty data drivers is reduced
Solution Approach 1:
The system dynamically switches between different operational modes (normal mode and inspection mode) by controlling the switch component. In inspection mode, the virtual feedback signal circuit is activated to provide distinct virtual feedback signals that enable verification of data driver functionality. The dynamic reconfiguration of the feedback signal path allows the system to maintain ease of operation while enhancing verification capability when needed.
Data Source
AI summary
There is provided a display device including a display panel, a plurality of data drivers configured to apply a data voltage to the display panel and to output a feedback signal indicating a driving status, a shared back channel configured to receive the feedback signal from the plurality of data drivers, a virtual feedback signal circuit configured to output a virtual feedback signal indicating a normal driving state of the plurality of data drivers, a timing controller configured to apply a data signal to the plurality of data drivers, and a switch connected to the timing controller, and configured to selectively connect the shared back channel or the virtual feedback signal circuit to the timing controller.