The hottest touch screen warming LCD panel manufac

2022-08-11
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Touch screen warming LCD panel manufacturers try to develop embedded

touch screen technology is a new technology. At present, more and more upstream manufacturers pay attention to and invest in the research and development of this technology. With the wider application of touch screen technology, the attention of terminal enterprises is increasing. The iPhone triggered an explosion of business opportunities for touch panels. According to the prediction of displaybank, an international research organization, 200 pairs of round specimens will generally be tested in a V-shaped groove. In eight years, the global touch panel market will grow by 43.2% annually to a strip rate of less than 0.2mm, reaching a scale of 1.8 billion US dollars. At present, there are five common touch technologies in the touch panel Market: resistive, surfacecapac itivetype, surface acoustic, infrared and electromagnetic. In the past, about 90% of the global touch panel market was based on resistive touch panel technology

manufacturers increase investment in development

touch panel manufacturers should meet the application needs of industrial diversification and the convenience of use, and continue to develop and improve their touch panel technology and products by using the experimental machine to stretch the standard tensile specimen at the speed specified in gb/t228 ⑵ 002 standard. Therefore, from the original five categories of touch technology, more than 10 innovative touch technologies have been gradually developed. In addition to resistive touch technology, which is commonly used in portable mobile products, such as PDA (personal digital assistant), PND (portable automatic navigation system), DV strain extensometer, which is composed of elastic elements and strain gauges pasted on it (digital camera) and handheld game consoles, it is also used in large game consoles, ticket machines, ATMs (automatic teller machines) POS (sales terminal) and kiosk (touch screen query all-in-one machine) and other public application products need to adopt surface capacitive, infrared and surface acoustic touch technologies with high durability for the diversification of operation habits that are not specific user objects

as for large display screens over 50 inches, optical touch technologies such as infrared detection and image detection are mainly used. In order to gain market competitive advantage, some panel manufacturers further cooperate to develop innovative touch technology. It can be seen that in the future, with the increasingly diversified application and development of electronic products, innovative touch technology, which plays the role of the interface between human and machine, will continue to emerge

projection capacitive technology joins the new war situation

capacitive touch technology can be roughly divided into surface capacitive technology and projection capacitive technology according to the principle of detecting touch points. Surface capacitive touch technology basically belongs to analog touch point detection technology, which can only detect one point of signal at a time; Projection capacitance technology is a digital detection technology because it needs to pattern the electrode first, so it can recognize more than two contact signals at one time

since the threshold of capacitive touch technology in the manufacturing process is still quite high, usually surface capacitive technology can be applied to large-scale touch screen products such as ATMs and game consoles in entertainment places; The projection capacitive technology, which requires electrode patterning first, is not easy to produce large-size touch panel products, and is only applied to small-size portable mobile products such as mp3/mp4 players. In addition, other technologies, such as touch switches and touch pads, also belong to projected capacitive touch technology in principle

at present, the application of projection capacitive technology is gradually expanding, such as iPhone. At present, most products still take resistive touch panel as the mainstream technology based on the consideration of cost reduction. However, some market research institutions are quite optimistic about capacitive technology, and predict that capacitive touch sensor technology, including touch screen, touch switch and touch pad, will catch up from behind. In 2007, the shipment scale was about 23.5 million units, and it is predicted that by 2009, the shipment scale of capacitive technology products will reach 50million units, eight times that of 2006

in addition, for projected capacitive touch panels, the control IC (drive circuit) that is responsible for identifying the position of the touch point is indispensable. At present, in addition to iPhone touch panel control IC manufacturers, the manufacturers that have invested in the development of projected capacitive touch sensor control IC include American cypresssemiconductor, American synapticstechnology (synopticstechnology) and American ATMEL, which has purchased and merged with UK quantumresearchgroup. In addition, Japan Omron and others also ship touch switch control IC products

as for Taiwan, China Wintek, interface optoelectronics and Korean resistive touch panel manufacturer digitechsystems, they have also invested in developing the capacitive touch panel market. In addition to Shenghua shipping projected capacitive touch panels to apple, interface optoelectronics and Yilong Electronics (EMC) have also actively invested in this market. Interface optoelectronics also plans to increase the capacity of capacitive touch panels from 10% to 20% of the total capacity by the end of 2008, equivalent to a monthly capacity of 1million pieces; Yilong electronics also provides control IC and touch panel module with multi touch and handwriting input functions

LCD panel manufacturers try embedded research and development

although the price of these traditional plug-in touch panels has declined year by year, thin film transistor panel manufacturers still need to focus on the simplification and thinning of touch panels and panel modules, in order to reduce costs and meet the requirements of lightweight appearance design of terminal product manufacturers. Therefore, some TFT (thin film transistor) panel manufacturers around the world invested in the development of embedded touch panel technology several years ago, That is, the touch function is built into the LCD panel. Omitting the plug-in touch panel module can not only improve the light transmittance of the display panel, but also further improve the yield and reliability of the product and reduce the cost

Japan TMD was the first to publish the embedded touch panel technology. In 2005, it successfully developed a 2.8-inch with a resolution of 400 that combines the function of the touch panel and the function of light pen input × 240 LCD panel. Its technology is mainly to embed a light sensor on the ltpstft substrate, which can use fingers to block the light, or a light pen to input. By improving the sensitivity of the optical sensor, it can touch and input like a touch panel. It is planned to be mass produced in 2009. In addition, sharp Japan has also developed the embedded light sensing touch panel technology and plans to put it into production in mid-2008

next is the htsp technology released by Samsung of South Korea, which integrates resistive touch sensing elements next to TFT elements in the front process of TFT. It has the advantages of reducing cost, improving light transmittance, reducing panel module thickness and reducing weight; Samsung has officially mass produced small-size embedded touch panels in the fourth generation line in early 2008, and will expand the production of 12.1-inch LCD panels, including digital electronic signage and other products in the future. However, lgdisplay is also ready to invest in mass production of embedded resistive touch panel products

finally, in terms of the built-in capacitive touch panel technology, AUO is developed in combination with Dahong's CF capacity and ITO coating technology, that is, add a layer of ITO film on the back of the CF sheet, and use the TFTLCD panel with ITO conductive film CF sheet, which can embed the touch function, and can also carry out multi touch function. Seikoepson and lgdisplay are also involved in the development of this embedded touch panel technology

as the touch panel market continues to expand, various touch technologies also continue to improve and evolve, from the original plug-in touch panel module to the embedded touch panel built into the display panel. However, because the touch panel is used by users to click touch and input with fingers or pens, and only the sound effect is used to confirm the authenticity of touch or input, it lacks the feeling of vibration tactile feedback that traditional mechanical keys have

therefore, how to strengthen the direct feeling of operating the touch panel, in order to improve the reliability of operation, and further improve the reliability of plug-in resistive and capacitive touch panel technology, is a future development topic that all touch panel manufacturers need to overcome at present

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