• Demystifying full-fit OCA Optically Clear Adhesive
    Jan 12 , 2020

    Demystifying full-fit OCA Optically Clear Adhesive

    Do you really understand OCA Optically Clear Adhesive? 1. What is OCA? OCA (Optically Clear Adhesive) is one of the raw materials of TFT touch screen. It is made of optical acrylic pressure-sensitive adhesive without substrate, and then a layer of optical release film is attached to the upper and lower bottom layers to make a double-sided adhesive tape. A double-sided adhesive tape without matrix material; OCA has the advantages of high cleanliness, high light transmittance, low haze, high adhesion, no crystal points, no bubbles, water resistance, high temperature resistance, UV resistance, etc. , And its thickness is uniform and flat, and the refractive index of OCA is close to that of glass, PC, and PMMA. Long-term use will not cause problems such as yellowing, aging, fogging, detachment from the adhered surface, and bubbles. All in all, it is the material used to make Touch Panle. 2. how to distinguish good or bad quality OCA? Good quality OCA has this effect: 1). Can reduce glare, reduce the loss of light emitted by the LCD or Mini OLED display, increase the brightness of the display and provide high transmittance, and reduce energy consumption; 2). Increase the contrast, especially the contrast under strong light; the surface connection has a higher intensity; 3). Avoid Newton's ring; 4). The surface of the product is smoother without wrinkles, bubbles, impurities, and the display image has almost no effect through OCA optical adhesive. 5). No borders, expand the visible area; good defoaming effect, high yield of TFT touch screen, no yellowing, good rework. The poor quality OCA is like this: 1). The process of gluing is prone to dead bubbles and cannot be defoamed. 2). After sticking the glue and removing the bubbles, it is easy to cause the bubbles to rebound. Rework is required, which takes time and cost. 3). The glue is prone to yellowing after being used for a period of time. 4). Imprinting will occur when the protective film of the adhesive is peeled off. There will be residual greasy glue and asymmetry around. All in all, we should pay attention to the following points in the process of purchasing OCA dry glue: Focus on checking whether there are indentation (the material does not allow joints), creases, white spots, foreign objects, pinholes, depressions, bubbles, glue wrinkles. 3. OCA processing technology: OCA die-cutting processing plants generally use optical adhesive die-cutting technology, optical adhesive product perforation and sleeve hole technology, optical adhesive linear bubble position adjustment technology; by purchasing OCA optical collagen material, and then according to different customers Combine the process for OCA structure design, precision die cutting or slitting and other preliminary processing and sell it to the assembly plant of the touch screen or display module. Downstream manufacturers establish more comprehensive and close ties. And according to the different full-fitting processes of different custom...
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  • Customers Visiting On November
    Nov 08 , 2019

    Customers Visiting On November

    Italy Customer Visiting On November 6th, We have our Italy customer Andrea with his colleages visting our factory. We had the meeting talking about TFT LCD Displays for small size 3.5''-4.3''. Customer visited our workshop, tested our samples,  confirmed the project details: price, lead time etc. Order will be confirm after they back to Italy and test on their product. The main products relate to: 3.5'' standard TFT LCD Display, 3.5'' touch screen display, 3.5'' TN Display, 3.5'' IPS LCD Display, 4.3'' touch panel screen and 4.3'' customized display
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  • Customers Visiting
    Oct 17 , 2019

    Customers Visiting

    Russia Customer Visiting from Auguest to October This is a customized project, it takes around 2 months from the first time meeting to order delivery. Our friend Filipp has visited us for 3 times, and very satisfied with our product and service. The second project starts from the second week after first order delivered. Here we would like to share with you of our Customize project management: 1. Inquiry → 2. Engineer analysis → 3. Quotation → 4. Order confirmed → 5. Prepare drawing → 6. Drawing confirmed → 7. Custom Fee → 8. Prepare Samples → 9. Sample Approved → 10. Mass Order production → 11. Delivery
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  • Customers Visiting in September
    Sep 24 , 2019

    Customers Visiting in September

    Sinocrystal -- Customer Visiting on September US Customer Visiting Customer Visiting Plant Customer Checking Samples
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  • Most (not all) LCDs change the polarization state of light passing through a layer of liquid crystal material
    Aug 02 , 2019

    Most (not all) LCDs change the polarization state of light passing through a layer of liquid crystal material

    On the most basic level, most (not all) LCDs change the polarization state of light passing through a layer of liquid crystal material. The geometry of that layer is controlled by a competition between boundary conditions and an applied electric field. Usually, for this type of LCD, nematic liquid crystals are used with special coatings applied to the rear and front substrates. The coatings serve to create the boundary conditions and to apply the required electric field. On the outside of the LCD cell, optical films (including polarizer films) are attached. They translate the change in polarization of the light into a bright and dark contrast. The display structure gets assembled in such a way that zero applied field gives one extreme brightness state and fully applied field results in the other extreme. An intermediate field creates an intermediate brightness level. The most common materials used to impose boundary conditions are called polyimides. A solution (or a precursor) of a polyimide is deposited on the substrates and cured. The type of polyimide and the type of liquid crystal define what angle the liquid crystal molecules will assume at the contact point between the polyimide and the liquid crystal. If the materials are ‘similar’, the LC molecules lay flat. If they are dissimilar (like oil and water), the LC molecules stand upright. ‘Molecular engineering’ is used to achieve the ideal angle for the application, which is different for different kind of displays. In order to define the direction of alignment, the polyimide surface is uni-directionally rubbed or brushed. LC molecules align parallel to that rubbing direction. If the angle and rubbing direction do not match on the two alignment surfaces, the liquid crystal alignment is elastically deformed. The nematic LC molecules want to be parallel to each other, but if the rubbing direction on either surface is orthogonal, the LC molecules are forced to twist very slightly from molecule to molecule until across the entire layer the direction has turned by 90°. There are three principal modes of deformation possible in a nematic liquid crystal. Each has its own elastic constant (spring constant). Some deformation may require more or less force, depending on the molecular structure of the liquid crystal. The three principal deformations are called ‘splay’, ‘bend’, and ‘twist’.
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