Display Timing Controller Clock Lock Fail Detection
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Solution Overview
Problem
Existing display devices face challenges in reducing the number of data drivers while ensuring accurate distinction of image data types from the timing controller, which can lead to display defects if not properly managed.
Innovation Solution
A display device configuration that includes a timing controller, a data driver, and a switching circuit, where the data driver divides image data into first and second image data and alternately outputs them, and the switching circuit supplies these data to specific sub-pixels in the display panel. The timing controller identifies lock failures in the data driver, interrupts data transmission, and resumes it after clock signal lock is completed, while also transmitting an identification signal to differentiate between first and second image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of data drivers is reduced by employing a switching unit, then fabrication costs decrease, but the difficulty of accurately distinguishing image data types increases
Solution Approach 1:
An identification signal is introduced as an intermediary element between the timing controller and data driver. This signal explicitly indicates whether the transmitted image data is first image data or second image data, enabling the data driver to accurately distinguish data types without requiring complex detection mechanisms. The identification signal is inserted by the timing controller and recognized by the data driver, solving the distinction problem while maintaining the reduced data driver configuration.
2Device complexity
If the data driver alternately outputs first and second image data to reduce driver count, then device complexity decreases, but the risk of display defects increases
Solution Approach 1:
A feedback mechanism is implemented where the timing controller monitors the clock signal lock status of the data driver. When a lock fail is detected, the timing controller interrupts image data transmission and initiates clock training to restore proper synchronization. This feedback loop prevents display defects that would otherwise occur due to desynchronization between the alternating image data output and the switching circuit's expected input timing.
Solution Approach 2:
The timing controller performs preliminary checks and corrections by monitoring the lock status before display defects can manifest. Upon detecting a lock fail condition, the system proactively interrupts transmission and performs clock training in advance, preventing the desynchronization from causing visible display errors. This preliminary intervention maintains reliability while preserving the simplified alternating data output structure.
3Duration of action of stationary object
If clock signal lock fail occurs in data driver, then transmission continuity is maintained, but image data synchronization accuracy deteriorates
Solution Approach 1:
The timing controller continuously monitors the lock status of the clock signal in the data driver and implements feedback control. When desynchronization is detected, the system interrupts transmission and performs clock training to restore precise synchronization. This feedback mechanism ensures that while transmission may be temporarily interrupted, synchronization accuracy is restored and maintained, preventing cumulative timing errors that would degrade image quality.
Data Source
AI summary
A display device includes a display panel; a timing controller configured to output image data; a data driver configured to receive the image data from the timing controller, to divide the received image data into first image data and second image data, and to alternately output the first image data and the second image data; and a switching circuit configured to receive the first image data and the second image data from the data driver, to supply the first image data to sub-pixels of a first group in the display panel, and to supply the second image data to sub-pixels of a second group in the display panel, wherein the timing controller is configured to: identify that a lock fail of a clock signal has occurred in the data driver upon receiving a first control signal from the data driver.