Label: Touch Panel display
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When consumers are no longer satisfied with the simple panel display function, the more interesting and intuitive touch panel technology has become the hot topic of discussion. Whether the terminal products are imported into touch technology from small size to large size, the core technology is also From the development of resistive mainstream touch technology, more solutions, coupled with Windows 7 and iPhone... and other topics, touch has become the mainstream of IT and 3C industry.
It is expected that the Windows 7 operating system, which was launched at the end of 2009, can be said to be an important fuze for igniting the medium and large-size touch panel market in 2009 due to the emphasis on the novel operating environment for integrating the touch experience. The iPhone, Android and WM phones are used. The small-size touch panel boom, and the touch panel technology on both the large and small size touch panels, the touch panel technology and products, has become a must for this year's major manufacturers.
Touch Screen is widely used in applications such as personal digital assistants, mobile phones, etc. The touch technology without display function will not be discussed here. The discussion will focus on the integration of touch control support on the display panel. Product and technology trends.
Among the related terminal products launched by the electronics industry, the computer equipment that can be operated by "touching" is becoming more and more diverse. For example, JVC's hard disk camera has introduced non-display touch technology, and it is popular in 2009. Netbook, Nettop... and other products echo this wave of touch, such as Acer, MSI, ASUS, etc., which is to develop a touch computer based on Netbook solutions.
Due to the booming touch industry, in DisplaySearch’s first report on touch panels, global touch panel shipments reached 3.1 billion in 2007, and in 2008 it had 3.5 billion shipments. In one year, the shipment volume can be increased by 400 million pieces. Observed that the shipment amount in 2007 was 1.2 billion US dollars, and the shipment amount in 2008 was as high as 2.3 billion US dollars, which is equal to 80% growth.
Touch panel size key
In the touch panel market, the larger the size, the more the price does not increase, but the technical basis and related component costs, but the size is still an important measure to discuss this technology. Especially for different application environments and practical products, the panel requirements are different, and the precision requirements of the touch technology will also be different.
â—Small size touch panel (less than 4 inches)
Generally small size, generally refers to products below 4 inches, most commonly used in consumer electronics such as digital cameras, mobile phones, personal digital assistants, PNDs, etc. This market has a wide range of applications, and the technology maturity of goods and components is high. Relative to the gross profit of the product, it appears to be the lowest.
â—Small and medium size touch panel (5~9å‹)
This is a touch panel with a size of 5 to 9 inches. It is currently used in advanced products. For example, higher-end PNDs, digital photo frames, ATMs, or outdoor KIOSKs, etc., most of which are used for capacitive panels. The outdoor KIOSK equipment is highly durable, while the consumer PND and digital photo frame are still based on low-cost resistive touch panel applications.
â— Medium and large size touch panels (10 to 21 inches)
It refers to 10 to 21 inch size panel. This part is mainly used in industrial computers and commercial touch screens. The main technology is capacitive touch, although there are different touch design products such as acoustic induction and resistance. However, capacitive touch technology has the advantages of scratch resistance, durability, anti-dirt, etc., which is the reason why the medium and large sizes are still mostly capacitive touch.
â— Large size touch panel (22 å‹ or more)
That is, 22-inch or more touch products, the large-size touch screen introduction technology is more diverse, because the resistance and capacitance type have physical limitations in the performance of large-size screens, although the current large-scale technology has successively implemented product launches. However, the technology used in this market is relatively diverse. More common in foreign countries are self-service systems, such as the processing of Lottery, Bingo, or Gaming Machine.
As the size of the touch panel increases, the system must be integrated with the built-in machine. If the touch technology is innately limited (for example, the volume becomes larger and the weight becomes heavier), the integrated product is not the system operator. As a result of the results, the sonic and infrared types of touch-demanding technologies that may increase the volume of the product are limited in practical applications. Instead, resistive and capacitive touches are more popular among related operators.
Capacitive touch is closely following
At present, the devices integrating touch technology are quite diverse, mainly including multimedia or communication peripherals such as mobile phones, PNDs, game consoles, PMPs, etc. At present, the applications are still small in size, and large touch panels are relatively unpopular in market applications. . Especially for iPhone smart phones, the attractive control experience is the key to the touch of touch technology products, while the large-size products, SuRFace computer technology previously released in Windows 7 and Microsoft, will also stimulate the market for medium and large touch applications. temperature.
The existing market demand is mainly based on two major applications of resistive and capacitive touch. The development of resistive touch technology is relatively mature, but the profit of relative products is also low, and its technology in multi-finger touch technology has its own Restriction, although some manufacturers have developed resistive touch technology comparable to capacitive multi-finger touch for multi-finger touch requirements, the implementation complexity of the technology is high, and the application market needs a period of time to test.
Capacitive touch technology, which is widely used by the iPhone, has caused global attention and madness. The iPhone is the best publicity sample of capacitive touch technology. Its multi-finger touch and smooth operation experience attracts many touch technology manufacturers. They have invested in budgets to develop similar multi-finger touch technologies and key components.
Touch technology diversity
The principle of resistive touch is that the upper/lower groups of ITO conductive films are superposed, and the electrodes are electrically conductive by the pressure. The position of the contacts is calculated by detecting the voltage change through the controller, and the entire contact detection process is completed. The material is a conductive film, and the transparency of the film is used to affect the display effect, but the advantage is that the technology is mature, there is no patent burden, and the cost is naturally lowered.
Looking at the current touch technology market, although resistive touch technology is the most widely used, the rest are popular capacitive touch technology, and there are multiple modes of practice such as infrared, ultrasonic, etc., but the infrared and ultrasonic technologies are compared. Suitable for large-screen applications such as digital billboards or electronic whiteboards... There has also been a slight mention of SuRFace technology, which is a multi-finger touch effect similar to the iPhone with a large rear projection screen. The touch area can be as large as a desktop, and the development of touch applications is much more interesting.
What's more, touch technology is not as technology as processors, memory, and hard drives. As long as the latest, fastest, largest, and other products perform, they can achieve certain market recognition and market share. But the touch technology is quite different. If the technology can't satisfy the user's habits, it will also affect the success or failure of the technology.
For example, the iPhone touch technology, which is known for its multi-finger touch, may have its application value for mobile phones. However, if it is applied to a medium-sized screen size product, the functional requirements of the multi-touch products may be relatively low, and even In order to increase the cost of parts due to multi-finger manipulation, it will also affect the market acceptance of products.
Resistance and capacitance technology are not inconsistent
In order to grab the touch market pie, for the touch panel, it still dominates the market's large-scale resistive touch technology, even if it possesses the home advantage, it does not dare to ignore it. In the past, resistive touch technology has fatal limitations and shortcomings in terms of light transmittance, sensitivity, accuracy and service life. However, in order to continue the market advantage, related companies have also developed non-PE film. The way (glass) resistive touch module greatly improves the original technical limitations due to the improvement of light transmittance, durability and accuracy due to small material improvements.
In addition, in the multi-touch design requirements, some companies have introduced a resistive touch structure that can achieve multi-finger touch and recognition. It has already overturned "multi-finger touch" = "capacitive touch". Technical advantage. In contrast, capacitive touch technology, because of the evaluation of the electric field and the detection of the current technical principles of touch coordinates, the touch panel can not effectively increase the size of the manufacturing, relatively restricting its market development. At present, the mainstream size of capacitive touch panels is still limited to 15 å‹ or less. However, under the repeated technical improvement of the industry, the current cost size has reached 32 ,. The related technology has the mass production strength, and the next step is how to effectively reduce the manufacturing cost.
How to solve the patent tightening curse, the key to capacitive touch
At present, the patents related to capacitive touch technology are mostly mastered by several major manufacturers, especially the key touch ICs, which affect the performance of the actual touch experience. Because capacitive touch is made of ITO of LCD panel with transparent wire plating, an electric field is formed on the surface of the panel. When the user touches with a finger, the capacitance value changes. At this time, the touch IC is converted to accurately touch the coordinates, and the whole process panel It is possible to receive noise at the same time, and its motion sensing operation process is complicated. There are a number of patented technology restrictions, which make it impossible for other manufacturers to enter the market easily. Manufacturers may also suffer from the cost of the touch IC, resulting in an increase in product cost.
It is generally believed that capacitive touch technology is difficult to break through the size limitation. The size of the resistive touch may be smaller. In fact, capacitive touch is not available in larger size panels, and its cost structure cannot be achieved. Competing with the same size resistive touch panel technology, resulting in lack of interest in mass production of related manufacturers.
Eliminate size restrictions, medium and large size applications look good
With the 15 å‹ touch screen cost observation, the use of capacitive touch technology will increase the cost to 3 to 4 times that of resistive technology, but this situation has been improved by the efforts of various manufacturers, the original cost The gap is gradually getting closer, and the size is limited to the laboratory's test products, which can reach a spectrum of nearly 40 miles.
However, the key to the realization of the capacitive touch technology is to sense the weak current change caused by the user touching the screen. If the size of the developed panel is continuously increased, the noise received by the touch sensing IC is rapidly increased, and the large panel is also brought. Come to the touch IC for more stringent noise suppression tests.
In addition, the current practice of the capacitive touch panel is to apply transparent wire coating on ITO. The larger the panel, the higher the impedance, and the relatively large chance of sensing has the problem that the sensing trigger signal is not uniform and the trigger condition cannot be clearly confirmed. The new method is to improve the array scanning, divide the panel area into several block areas, and perform sensing and verification through the system sequentially. Due to multi-task analysis, the performance limit of a single sensing IC can be complemented by multi-party comparison. , analysis, can also systematically filter the background noise.
Large size, high profit, high difficulty
Although the touch screen is the most popular in the medium and small size market, the gross profit is not high. For the related component manufacturers, the profitability is limited. On the contrary, it is difficult to use medium and large size applications. A lot more.
However, with the increase of the size of the touch panel, although it has the advantage of high gross profit, the technical bottleneck of developing large-size touch technology is relatively complicated. For example, the size of the touch screen is large, and the primary problem is the linear accuracy of the panel. Since the purpose of "touch" is to replace the mouse operation, the linear performance is inaccurate, and frequent malfunctions occur.
When the touch panel is larger, it also represents a relatively large number of lines and miscellaneous. The cost of production is increased. In the capacitive touch environment, there are also problems such as stray capacitance and environmental interference. How to reduce the problem? Design complexity is also the key to developing large-size products.
The larger the size, the larger the panel will also magnify the precision of the original product. Then look at the design problems that the practice will face, the large-size panels are made, and of course there will be weight problems of the products. When the panels are enlarged, the weight of the products will also increase. With a 30-inch touch panel, the weight of the finished product is as high as 2 kg, which is much higher than the weight of the simple panel. How to design the exclusive handling fixture? Or to prevent collision and pressure during transportation, all are considered.
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