TCON IC Interface Conversion for LCD Portrait Display
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Solution Overview
Problem
Existing liquid crystal display (LCD) projectors face challenges in displaying portrait mode images from mobile devices, as they typically support landscape mode only, requiring costly hardware and software solutions for conversion.
Innovation Solution
Modifying the settings of the driving TCON IC to change the input signal interface from MIPI to TTL+SPI, allowing real-time conversion of landscape images to portrait mode, and implementing algorithm corrections for synchronized data transmission to prevent diagonal tangent lines and image interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MIPI interface is used for portrait display, then display mode conversion is achieved, but hardware and software costs increase significantly
Solution Approach 1:
The patent changes the interface parameter from MIPI to TTL+SPI, and modifies the TCON IC configuration parameters to enable landscape image input conversion to portrait display, achieving display mode conversion without requiring costly MIPI interface hardware
Solution Approach 2:
The patent uses the existing TTL+SPI interface and TCON IC to replicate the functionality of the MIPI interface, avoiding the need for specialized MIPI hardware by copying the signal processing function through software configuration
2Quantity of substance
If landscape image is directly displayed on portrait LCD, then complete image is shown, but image orientation is incorrect for mobile device output
Solution Approach 1:
Instead of rotating the portrait image to landscape orientation for display, the patent inverts the approach by taking the landscape image and transforming it into portrait orientation data structure, matching the mobile device's output format while displaying the complete image on the portrait LCD
3Productivity
If image data is written and read simultaneously in RAM, then display is continuous, but diagonal tangent lines and image interference occur
Solution Approach 1:
The patent implements periodic action by separating image data writing and reading operations in time, using vertical synchronization signals to control the writing of new image data only after the previous image has been completely read and displayed, preventing overlap and resulting artifacts
Solution Approach 2:
The patent applies preliminary action by completing the reading of the entire previous image data from RAM before initiating the writing of new image data, ensuring that the display buffer is fully updated and ready for the next frame, thus preventing diagonal tangent lines and image interference
Data Source
AI summary
The present disclosure discloses a method for changing a landscape signal of a liquid crystal screen to a portrait mode. The method comprises: adjusting the setting of a built-in driving TCON (time controller) IC (chipset) of the LCD so as to change the input signal interface of the LCD from an MIPI (mobile industry processor interface) to a TTL (transistor-transistor level) data/timing interface+SPI (serial peripheral interface) command control interface; controlling the initialization, turning-on and turning-off of the driving TCON IC via the SPI interface, and realizing the switching among four projection modes, desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting the up, down, left and right display directions of a screen output image; receiving, in real time, the landscape image outputted by a front-end video processing chip through the TTL data interface, and then displaying same in real time.