What is a Trackpad?

The touch panel is a new product in the market. The market share of the touch panel in the NB market is still not high, and it is expected to be less than 5% in 2009 ~ 2010.

Touch panel

Right!

The touch panel is a new product in the market. The market share of the touch panel in the NB market is still not high, and it is expected to be less than 5% in 2009 ~ 2010.

Chinese name

Touch panel

Foreign name

touch panel

Control panel structure

Sensors, controllers and software

Classification

Resistive, capacitive, optical, sonic

Resistive

Waterproof, good antifouling and cheap

Capacitive

Better fire resistance, stain resistance and scratch resistance

Optical

High reliability, scratch resistance and fire resistance

However, in terms of annual shipments of about 130 million NB units, the monthly demand for touch panels is about 500,000 pieces, which has far exceeded the current global total capacity of capacitive touch panels. As for the capacitive touch panel manufacturers that have begun mass production at this stage, including Innolux, Shenghua, and Honghong, they mainly use production lines below 2.5 generations, which is more suitable for the demand for small-size capacitive touch panels such as mobile phones. With the introduction of touch panels into notebook computer (NB) applications, future demand will increase significantly, especially the capacitive technology with multi-touch and operating interfaces closest to the consumer's intuitive experience, which has become a battleground for all players. Following Innolux's announcement that it will invest in a large-size touch panel production line, AUO s color filter (CF) factory, Dahong, has decided to switch the 4.5 generation CF production line to touch panel production. Orders have been placed for the equipment and it is expected that in 2010 Successive production capacity has made the touch panel move towards the 4.5 generation production line.

Demand for the touch panel market has exploded. As various types of digital consumer electronics products have introduced touch applications, the global touch panel market has grown rapidly. Global touch module shipments will grow from 1.23 billion in 2011 to 1.79 billion in 2014, with a compound annual growth rate of 13.5%.

The touch panel is coated with a layer of tin antimony oxide (ATO Layer) and a protective film (Hard Coat Layer) on the surface of the transparent glass, and an electronic signal interference prevention (Shielded Layer) is required between the LCD panel and the LCD monitor. The touch panel is a direct embodiment of touch technology, which is used to sense contact signals and analyze them.

Touch Panel Technology Introduction The touch panel structure consists of three parts: a sensor, a controller, and software. The sensor is the touch panel part, which mainly receives the information input through contact; the function of the controller is to analyze and calculate the position of the contact point, and convert the analog signal into a digital signal, so that the information equipment can accept the input signal; the software part The communication agreement between the information processing device and the controller allows the information processing device to receive and recognize the signal input by the controller for subsequent processing.

Touch panels can be divided into four types: resistive, capacitive, optical, and sonic according to different sensing technologies. The principles and characteristics of various technologies are introduced below.

Touch panel resistive touch panel

The resistive touch panel mainly consists of two sets of ITO conductive layers, spacers and electrodes. ITO glass is mainly used as the substrate, and a layer of ITO Film is superimposed on it. Spacer is interspersed in the middle so that the upper and lower plates will not be conductive due to the proximity. The silver electrodes are printed on the edges to provide voltage. When in use, the upper and lower electrodes are turned on by pressure, and the controller detects the change in panel voltage and calculates the position of the contact point for input. The advantages are waterproof, good antifouling, and affordable, but the disadvantage is that the scratch resistance and fire resistance are poor.

Touch panel capacitive touch panel

The capacitive touch panel uses the change in capacitance generated by the electrostatic combination between the transparent electrode and the human body to detect its coordinates from the induced electricity generated). The induction principle uses voltage to act on the four corners of the screen's sensing area and forms a fixed electric field. When a finger touches the screen, the electric field can cause a current to be measured by the controller. Depending on the proportion of the current to the four angles, you can Calculate the contact position. However, the capacitive touch panel must overcome the noise caused by static electricity caused by fingers or other touch media, so it is more difficult to design the current and structure. The position can be calculated from the current ratio when subjected to a touch pressure.

The capacitive touch panel is composed of a conductive layer on a glass substrate, an electrode layer, and a protective film on the surface layer. The capacitive touch panel is completed because it is only on a single piece of glass. As the electrode and conduction. The resistive touch panel needs to overlap the ITO conductive layer of the upper and lower boards, which affects the overall light transmittance of the touch panel. Therefore, the capacitive light transmittance is higher than the resistive type, which can reach more than 90%. The product has better fire resistance, anti-fouling and scratch resistance, and has faster anti-dust and reaction speed.

Touch panel optical touch panel

The principle of the optical touch panel is to use the light source receiving and blocking principle. The panel is covered with light sources and receivers and arranged in a matrix. When the light is interrupted, the position of the signal receiver cannot be received, and its accuracy is determined. position. The components of the optical touch panel include a glass substrate, an infrared emitting source, and an infrared receiver. The structure mainly arranges the infrared emitting device on the left and lower sides of the glass panel, and sets infrared receivers on the right and upper sides. When a finger or a contact object blocks the infrared rays, the contact can be detected through the information received by the receiver. The matrix position of the point. Its advantages are that the surface is pure glass without affecting the light transmittance, the product has high reliability, scratch resistance, and good fire resistance, but the disadvantages are poor waterproof and antifouling properties.