Synchronous Image Data Transmission via Primary Switch Circuit
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Solution Overview
Problem
Large size LCD televisions require accurate synchronous data transmission from multiple image data transmission chips to display frames correctly, which is challenging due to the need for synchronized data delivery across different areas of the panel.
Innovation Solution
An image data transmission apparatus with a primary switch circuit and voltage transmission paths that switch control voltage levels based on a primary frame aligning signal, ensuring all output stage circuits receive the control voltage simultaneously to output image data synchronously to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple image data transmission chips are used to provide image data for different areas of a large panel, then the display capability and coverage are improved, but the synchronization accuracy and complexity of data transmission increase
Solution Approach 1:
The display panel is divided into multiple areas, with each image data transmission chip responsible for a specific region. This segmentation allows parallel data transmission to different panel sections while maintaining overall synchronization through the frame aligning signal mechanism.
Solution Approach 2:
A frame aligning signal transmission mechanism is implemented where the primary output stage circuit sends a frame aligning signal to the primary switch circuit. This feedback loop enables the system to detect and coordinate the timing of data transmission across multiple chips, ensuring synchronized output despite the increased complexity of having multiple transmission channels.
2Manufacturing precision
If synchronous data transmission is implemented across multiple image data transmission chips, then the display accuracy is improved, but the control circuit complexity increases
Solution Approach 1:
Multiple voltage transmission paths are merged into a unified control structure where a single frame aligning signal from the primary output stage circuit coordinates all output stage circuits. This merging approach maintains transmission accuracy across multiple chips while reducing control circuit complexity by using a centralized synchronization mechanism rather than independent control for each chip.
Solution Approach 2:
The voltage transmission paths are designed to have equal signal transmission times, creating an equipotential timing condition across all output stage circuits. This ensures that all chips transmit data simultaneously with the same timing reference, improving display accuracy without requiring complex differential control circuits for each transmission path.
3Measurement precision
If voltage transmission paths with equal signal transmission time are used, then the synchronization precision is improved, but the circuit design complexity increases
Solution Approach 1:
The voltage transmission paths are designed with matched electrical characteristics (resistance, capacitance, inductance) to ensure equal signal transmission times. By carefully selecting and matching these electrical parameters, the system achieves precise synchronization timing without requiring complex active control circuits or continuous adjustment mechanisms.
Data Source
AI summary
The present disclosure discloses an image data transmission apparatus having synchronous data transmission mechanism. Output stage circuits respectively receive and store image data corresponding to a part of a display frame. A primary switch circuit is coupled to a primary output stage circuit of the output stage circuits so as to maintain a control voltage of a control terminal at a first level when a primary frame aligning signal having the latest timing is not received from the primary output stage circuit, and switches the control voltage to a second level when the primary frame aligning signal is received. The output stage circuits output the image data to an image data receiving apparatus to display the display frame synchronously when the output stage circuits receive the control voltage having the second level through voltage transmission paths having the same signal transmission time.