Authors:
Leo Lee, Ty Wu, Anderson Lin, Vicky Chen
Abstract:
This disclosure proposes a simple mechanical system to detect screen rotation in a Video Display.
Background:
A G-sensor, gravity sensor or accelerometer are most common components used to detect video/screen orientation or rotation. Currently our TGCS AIO systems (TCx8xx) have built in those sensor to support auto-rotation/detection for landscape or portrait modes. For the TCx Display, there is no such sensor to achieve auto screen orientation detection.
Our idea is to leverage current display EE design with a simple mechanism to achieve this.
Description:
Use the following method to create the rotation detect feature:
1. Use a GPIO with external pull high resistor, for example pull up to 3.3V
2. GPIO will connect to a contact/metal point
3. A simple metal spring/bar will be added near to metal point
4. When display rotates from landscape to portrait, the metal spring will be pull down to connect that metal point due to gravity.
5. Once it contacts/connects, the GPIO status will be changed from High to Low (metal spring is grounded).
6. The Video controller (scalar) will monitor this GPIO to rotate the video streaming to match the screen rotation.
TGCS Reference 00215
