Self-capacitance sensing technology has greatly increased the development of next-generation In-cell touch solutions. In order to reduce the mass production cost and improve the yield, in addition to the touch panel factory actively research and development integrated sensing layer and driver layer single-layer self-capacitor In-cell multi-touch solution, the touch IC industry also stepped up the self-capacitance sensing function. And create an integrated solution that supports both self-and mutual capacitance sensing.
Since the iPhone 5 has developed a trend of in-cell touch, In-cell has been limited to high-end products due to factors such as high technology cost, poor yield, and difficulty in developing touch ICs. Relevant panel manufacturers and chip vendors are working to improve the In-cell sensing layer (Rx) structure and control wafers, and overcome the serious noise problems of In-cell touch and achieve multi-touch, in order to achieve better mass production investment benefits. Accelerate the cutting into low-end smartphones.
At this stage, the chip industry has locked the In-cell touch solution that can support both self-capacitance and mutual-capacitance sensing, and comprehensively improve the chip signal-to-noise ratio (SNR) and differential signal analysis functions, including Cypress and Long Electronics has integrated two kinds of capacitance detection technologies to develop new touch ICs; as for other chip vendors, they have begun to strengthen their self-capacitance and intellectual property (IP) lineups and step up their efforts.
Self-/mutual capacitance sensing touch IC reduces panel noise
Cypress's TrueTouch marketing director John Carey said that Cypress has gained a lot in the OGS field in addition to its position in the In-cell touch market.
Cypress TrueTouch marketing director John Carey said that the In-cell touch sensing layer is quite close to the liquid crystal display (LCD) signal source, and it is also subject to power noise interference. The biggest technical challenge is how to accurately measure the signal; therefore The touch IC must amplify the computing and sensing capabilities, and at the same time strengthen the communication and time-sharing mechanism with the LCD driver IC, so that the In-cell can simultaneously consider the thin and light design and excellent touch experience.
Based on the above considerations, the touch IC factory has reinforced the self-capacitance sensing function of the chip to capture more In-cell touch sensing layer signals, and then analyze and filter the noise to improve the touch response speed and accuracy performance. However, Carey stressed that since the self-capacitance technology can not support multi-touch above three fingers, it must be matched with mutual capacitance sensing, thus setting off a new wave of design of touch ICs to support dual-capacitance sensing.
Among them, Cypress has built the industry's first integrated touch IC with its complete self-capacitance and mutual capacitance IP lineup, which can automatically switch between two sensing modes and improve the In-cell touch through differential signal analysis. The control panel is full of the drawbacks of a lot of noise. Carey pointed out that the company's latest touch solution, the TrueTouch Gen4X, was launched at the 2013 International Consumer Electronics Show (CES). Its anti-noise capability is three times higher than that of the previous generation, and the signal update rate is as high as 100?120Hz. Greatly exceed the industry's average level of 60Hz.
It is reported that the product has been sampled and will be introduced into mass production in the next 1-2 months. According to Carey, Cypress is also actively cooperating with Taiwan, mainland China and Japanese panel makers due to the increasing popularity of In-cell touch control wafers. In addition, the Korean panel factory is also working with the company to promote the In-cell touch development program. In a series of close cooperation, the terminal products equipped with Gen4X touch ICs are expected to be released this summer to grab the high-end smart phone market.
Coincidentally, Elan Electronics also showed its multi-touch solution, Smart-Touchscreen, from CES this year. The product locks in small-sized smart phones, uses a digital signal processor (DSP) to improve core computing power, and integrates the advantages of self-capacitance and mutual capacitance sensing to enhance noise immunity, providing high accuracy and linearity; Support single-layer transparent conductive film (ITO) touch panel solution, and provide the highest ten-finger multi-touch and 2 mm (mm) stylus, excellent performance-price ratio.
As for SynapTIcs, Duntech and other touch IC manufacturers, they have accelerated their research and development of self-capacitance design. Recently, they have successively revealed technological progress and product plans. It is expected to follow up with self-/mutual capacitance dual-sensing products in the future. Carey stressed that in the short term, touch panel manufacturers should develop In-cell products with multi-touch and high noise resistance. It is a shortcut to introduce self-/mutual capacitance integrated control chips, and encourage IC manufacturers to invest heavily in R&D. .
In addition to enhanced capacitance sensing capabilities, In-cell touch ICs must also work in conjunction with LCD driver ICs to reduce the risk of mutual influence. At this stage, the industry is roughly divided into two major technology camps. First, it is the model of Synopsys International, which also integrates touch ICs and LCD driver ICs into system single-chip (SoC). Secondly, through the display driver interface (DDI), A design scheme for communication between a touch IC and an LCD driver IC.
Carey analysis, In-cell touch panel technology is very different; if combined with the first integration program, although it can enhance the degree of customization, but also lacks design flexibility, to improve the proximity of the chip (Proximity Sensing), noise It is relatively difficult to analyze or add new functions such as floating touch and waterproof. As for the second separate solution, the DDI design can be further changed according to different LCD driver requirements, and various functional designs and In-cell touch panel architectures are supported. Used by Cypress and most touch IC manufacturers.
Not only has the In-cell touch IC experienced major technological breakthroughs, but it has also made great progress in the design of the sensing layer. Recently, supply chain operators are brewing to replace existing dual-layer mutual capacitance sensing technology with single-layer self-capacitance, including Apple, Samsung, Taiwan/Japan panel manufacturers and first-line touch IC manufacturers. The company also invested in the development of a new generation of touch ICs and LCD driver ICs to improve the design structure of the In-cell sensing layer and improve panel yield, cost and noise.
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