Adjusting the sensing structure to fully break through the In-cell yield and mass production shackles
In-cell touch is expected to break the shackles of mass production in the second half of this year. In order to solve the problem of poor In-cell yield and stability, Duntai Electronics has cooperated with many panel factories in mainland China. In addition to developing a new generation of In-cell touch panel sensing layer structure patents, In the second half of this year, an integrated single-chip liquid crystal display (LCD) driver plus touch IC will be released to fully improve the In-cell touch signal sensing and time-sharing processing capabilities.
Bai Peilin, deputy general manager of marketing of Duntai Electronics, said that in the current small and medium-sized touch solutions, mass production yield and capacity have reached a certain level of double glass (GG), double film (GFF), single glass (OGS) or On-cell, the thickness is mostly between 2.1 and 3.0 millimeters (mm), which is not as good as the In-cell to achieve the ultimate thin and light performance of 1.8 mm; and this difference of a few centimetres is the most important strength of mobile phone manufacturers, including Apple (Apple), Sony (Sony), and even mainland Chinese brand owners have all invested in the layout, thus making In-cell the focus of the touch industry.
However, In-cell built the touch-sensing layer in the LCD panel, which not only increases the difficulty of manufacturing, damage rate and liquid crystal noise, but also the sensing accuracy and stability are not in place; the overall yield is low, In the case of shortage of production capacity, the price is also expensive.
In order to overcome the severe challenges of In-cell and accelerate the time to market and price reduction of terminal products, Duntai has developed a new generation of In-cell touch panel patents, which can increase the yield to a level comparable to general glass and thin film touch solutions. Bai Peilin pointed out that this innovative structure improves Apple's In-cell method, turning the sensing layer from the bottom of the LCD to the top to fit, which can shorten the distance between the finger and the sensing layer, and avoid serious noise interference of the liquid crystal layer.
Although Duntai's approach is expected to overcome the biggest bottleneck of In-cell mass production, the design space above the LCD is tighter than below, and the distance between the X and Y sensing layers will be narrowed, which will amplify the capacitance of the two poles and affect the touch signal. Identification and sensing accuracy. Focusing on this, Duntai will also combine its own touch IC hardware and software, and the silicon intellectual property (IP) technology of the LCD driver IC supply chain under the cooperative panel factory, and will release an integrated system on a chip (SoC) in the second half of this year. In order to strengthen the synchronization or time-sharing processing capabilities of touch and liquid crystal signals, the new In-cell sensing structure is running without hindrance.
Bai Peilin revealed that Duntai has set a schedule for mass production of new In-cell touch panels with a number of mainland Chinese panel makers, and is continuing to discuss cooperation with Taiwan panel makers. Initially, it will lock in mainstream specifications of 4-5 inch smartphones. After the second quarter of this year, the volume is increased quarter by quarter to assist mobile phone manufacturers to build affordable and high-standard In-cell products.
It is reported that, in addition to the first-line brand factories in China such as Huawei and ZTE, which have planned to introduce In-cell touch solutions in new products, Coolpad will also launch a 6.5mm In-cell smartphone that is known as the thinnest in the world in the second half of this year. This shows that the demand for In-cell's production capacity will increase.
Bai Peilin believes that the benefits of In-cell are well known. Once more excellent sensing structures and touch chips are in place in the second half of the year, they will gradually exert the economic benefits of mass production and quickly become the mainstream of small and medium-sized touch solutions, and set off a new wave. Technology shift.
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