Main Control Chip Signal Detection for Full-Screen Projection
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Solution Overview
Problem
When projecting images from a mobile device to a display, the mismatch in screen size ratios results in black edges on the display, negatively impacting the user's visual experience.
Innovation Solution
A method involving a main control chip that detects signal intensity and resolution to calculate the starting position and width of the display picture, allowing for proportional or full-screen output, and sets rotation flags for picture scaling and rotation to eliminate black edges, using USB TYPE-C and gravity sensing for accurate scaling and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the picture is projected directly from mobile phone to display without adjustment, then the projection process is simple, but black edges appear on the display due to screen size ratio mismatch
Solution Approach 1:
The main control chip performs preliminary detection of the display signal intensity and resolution before picture projection, calculates the black edge positions and picture starting position in advance, and pre-adjusts the picture parameters to eliminate black edges before the actual projection occurs
Solution Approach 2:
The system changes the picture parameters (width, height, starting position) based on the detected display signal characteristics, dynamically adjusting the picture dimensions and position to match the display screen ratio and eliminate black edges
2Area of stationary object
If the picture is enlarged to full-screen output, then the visual coverage is improved, but picture distortion may occur
Solution Approach 1:
The main control chip detects the display signal intensity and resolution as feedback, uses this information to calculate the appropriate picture enlargement ratio and starting position, and adjusts the picture parameters accordingly to achieve full-screen display without distortion
Solution Approach 2:
The system dynamically changes the picture parameters (width, height, starting position) based on the detected display characteristics, calculating the optimal enlargement ratio that fills the screen while maintaining picture proportion and avoiding distortion
3Ease of operation
If the picture rotation is adjusted to match display orientation, then the visual experience is improved, but the processing complexity increases
Solution Approach 1:
The system uses the gravity sensing function of the mobile device to automatically determine the correct picture orientation, and the main control chip automatically calculates and applies the appropriate rotation angle, making the system self-adjusting without requiring manual intervention
Solution Approach 2:
The main control chip integrates multiple functions including signal detection, parameter calculation, picture scaling, rotation, and positioning in a single processing unit, reducing overall system complexity while achieving comprehensive picture optimization
Data Source
AI summary
Disclosed are a method for displaying projection picture and a method for rotating projection picture, comprising following steps: A: using a main control chip of a display to receive a picture signal parameter of a handheld terminal; B: the main control chip determining the black edge and calculating the starting position of a display picture by detecting the intensity of display signal inputted from the handheld terminal; C: obtaining the width of the display picture by calculation, and at the same time, directly obtaining the height of the display signal by signal detection of the main control chip; and D: using the function calculation provided by a control unit to enlarge the picture to a proportional or full-screen output with the handheld terminal. After adopting the above method, the display provides a picture with “full screen without having black edges” or “small black edges” to enhance the visual experience.