S3C2410 touch screen and modulus Conversion

S3C2410 touch screen and modulus Conversion

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I. Concepts of Touch Screen

The so-called touch screen is a computer input device that everyone uses, or that everyone uses to communicate with the computer. You don't need to learn. It is used by everyone. It is the biggest magic of a touch screen. It cannot be compared to a keyboard or a mouse.

In terms of technical principles, the touch screen is a transparent absolute addressing system. First, it must be transparent. Therefore, it must use material technology to solve the transparent problem, like digital devices, wordboards, and elevator switches, they are not touch screens. Secondly, they are absolute coordinates, where are the fingers, and do not need a second action. Unlike the mouse, it is a set of relative positioning systems. We can note that touch screen software does not require a cursor, but it affects the user's attention, because the cursor is used for the relative positioning equipment, to move a device to a specific location, you must first know where the device is and in which direction it is going. The current location must be constantly reported to the user every moment to avoid any deviation. These are not required for touch screens with absolute coordinates. The second is to detect the touch action of the finger and determine the position of the finger, all kinds of touch screen technology is centered around "detecting finger touch", and the Eight Immortals are everywhere.
1. The first pointer of the touch screen: optical properties. It directly affects the visual effect of the touch screen. However, the touch screen is a multi-layer composite film with four optical properties: transparency, color distortion, reflectivity, and clarity. The color world contains various wavelength colors in the visible light band. Before the transparent material technology is completely solved, or before the transparent material technology is well developed at a low cost, the light transmittance of the multi-layer Composite Film Touch Screen at various wavelengths cannot reach the desired consistency. Below is a (Figure 6-1 ):