Technical analysis and design skills of a variety of touch TFT Display Module

From the phone, office equipment, speakers, digital photo frames, TV control buttons, remote control, GPS systems, automotive keyless control, medical monitoring devices, touch devices everywhere! Every industry, each product type, of various sizes, each application, and even touch technology, are inseparable from each price point. It can be said that the touch technology is everywhere.
In fact, if the product has an LCD or keyboard, designers may need to consider how to design a product using the touch technology. For designers Unfortunately, when the design of the touch screen, there are many different kinds of solutions, there is a wide range of performance, of course, need a variety of different design considerations. Therefore, it is need-depth understanding of the technology, and the time to assess your product series. The only way to become the market leader, good design is the starting point of the design.
In-depth analysis of the touch technology
Find out required for the design is the touch product design is the most important first step. The touch screen on the supply chain providers usually provide many confusing different components, more often some providers together to provide end-customers a value chain. FIG 1 shows a configuration diagram of the touch screen ecosystem. Interestingly, the ecosystem are the same whether it is in the latest laptop, or the latest touch screen phone.
1 front panel or frame
The outermost layer of the front panel or the frame is the end product. In some products, the frame around the transparent cover up against the harsh climate of the external or the effects of humidity, but also to prevent the following sensing products subject to scratching and damage (see # 3). Some time, the outermost frame simply covering the top of the touch sensor, this case is merely a decoration.OLED Display Module
2 Touch Controller
Typically, the touch controller is a small micro-controller chip, which is located between the controller of the touch sensor and the PC / or embedded systems. The chip can be fitted into the internal system controller board, the paste can also be placed on the glass touch sensor on the flexible printed circuit (FPC). The touch controller will extract the information from the touch sensor, and converts it into a PC or embedded system controller can understand information.
3 touch sensing
The Touchscreen "sensor" is a with a touch response surface of the transparent glass plate. The sensor is placed to the LCD at a touch area, so that the panel can cover the viewable area of ​​the display. There are many different kinds of touch sensing technology on the market today, each using a method different from each other to detect a touch input. Basically, these techniques are in touch, so that the current flowing through the panel, resulting in the change of a voltage or signal. This voltage change will be a touch controller sensing, thereby determining the position of a touch on the screen.
4 liquid crystal display (LCD)
The vast majority of touch screen system is used in a conventional LCD. LCD selection method for a touch product with substantially the same as the conventional system, including the resolution, sharpness, refresh rate, and cost. But the touch screen Another major consideration is the radiation level. LCD touch sensor technology is based on a tiny electrical changes arising from the panel is touched, the radiated electrical noise is a difficulty in the design. Before selected for the LCD touch system, touch sensor provider should be consulted.color lcd display module