送女人香水代表什么:Touch-screen display module in the quality of Newton's ring defects and corrective and preventive me

In the resistive touch screen and liquid crystal display production process, the Newton ring (some manufacturers also called rainbow pattern, or simply called the Rainbow) drifting like a ghost in the workshop, accidentally, from time to time it with the customer in the production occur during use, made to do a lot of site management in the workshop process and technical personnel captivated. Not because it is too beautiful rainbow, but the quality of this beautiful killer, in the current industry, too easy to trouble, let someone else a fine Yan finds fault.
In the display module, the Newton ring region appears as the underlying reason why the interference of light, color overlay which will cause color errors leading to the final show, on the other hand, also reduced the display contrast of the region, it is mainly as a fatal defects in the column set.
First, the mechanism of Newton's rings
We know, whether it is resistive touch screen lcm, or liquid crystal displays, are two of the main support piece of ITO glass or ITO glass, a piece of ITO FILM, if there are side material generated deformation, the inner surface of ITO materials to produce a radius of curvature of the surface, with the usual physical optics in the generation of about Newton ring convex lens surface and the plane mirrors effect is the same, Newton ring is also reflected in the relatively light because of the two surfaces reflect light and incident light wavelength of optical path difference and the relationship between. It is the same, because the optical path difference will increase, that is, the distance between the surfaces increases the distance between Newton's rings will increase.
In the actual production process, regardless of Ye Hao resistive touch screen, LCD Ye Hao, will support the frame at the distance farther than the middle of the gap slightly larger, slightly worse if the process parameters from, then the distance difference would not be able to eliminate, so let the two surfaces have a certain inward sag in the middle, so that the light in the two optical path difference between the surface will produce not the same as in the incident light and reflected light interfere with each other process, to will be according to different optical path difference selected different wavelength region out, revealing the color of the corresponding wavelength.
Second, the actual production of local produce Newton rings and why
In the liquid crystal display module, there are three areas most prone to Newton's rings:
1, the liquid crystal display internally generated rainbow.
LCD cell thickness of 10 microns are generally, if the number of particles is not enough space inside, or uneven, or the space frame and the particle diameter of the internal support is not suitable for workshops with the design process, will have a rainbow defects. Another major cause of that process into the box, the box is more than the diameter of space particles contaminated by foreign objects, which is the liquid crystal display plant for clean environment is very strict control of reason.
2, the liquid crystal display with resistive touch screen between the ripples (also known as Watermark)
The water ripples, the same is in one of Newton's rings, especially the resistive touch screen action, the added resistance to outside pressure on the touch screen resistive touch screen caused by bending under the surface, it will change with the intensity of Newton rings will move the color radius, generate or disappear, just like stones dropped into the water, like ripples of water produced, so this is also called Newton's rings ripple or watermarks, will be shown with the location and movement action and change the pressure .
3, the resistive touch screen inside the Newton rings (also called rainbow pattern)
Resistive Touch Screen in the production process, in order to produce a touch deformation region, the height of the general outline of the support points are much higher than inside, water-based glue to do if the printed words of frame, generally 50 to 70 microns in height so; If you are using double-sided adhesive PET substrate, the general is also more than 50 microns, while the inside of the support points, generally less than 25 microns, using 30 to 45 microns in diameter, DOT, the forming height of the last strong point, only 15 ~ 25 microns.
With resistive touch screen operation surface, the same region in order to produce a deformation of touch, usually ITO FILM, the material is flexible. Thus, if the production control process parameters inaccurate, do not move operation, in the product by the middle part of the ITO FILM, will collapse of its own, attached to the anchor, the produce surface deformation, so that light rays with the inner surface of the two ITO negative light to produce interference, they formed a Newton ring.
Third, how to measure to prevent Newton rings produced by the design parameters
In actual production, how to effectively prevent the generation of Newton's rings, the same optical ring according to Newton's law of prevention.
In the beginning we began to design products that can be based on product dimensions, calculate the height of the inner and outer box, how much value is, the Newton ring inner radius of the dark ring, would fall outside the product size, so you can optimize the parameters of their own design . (How to calculate and principles of the formula may refer to Annex "equal thickness interference experiment").
Of course, the above validation of this approach is a theoretical fact, if calculated in accordance with the real data, we can not make the customer demand for products, but this calculation, you can guide us in the production, how best to close to the theoretical values .
Some would say that it does not accurately calculated, the production can not be avoided, there is no better way yet? Have, or refer to the attached "equal thickness interference experiment" approach, with a microscope or a micrometer to measure the deformation of your shift down on the number of films, the Newton ring appeared, and then calculate your Newton rings appear in the middle of the smallest particles or the thickness of the supporting space, if together with the pressure gauge with, but also to measure the product of Newton rings occur when the pressure is. Therefore, problems, start testing methods demonstrated, from the experimental data to validate, from process parameters on the adjustment.
Fourth, how to prevent Newton rings from craft production
1, the liquid crystal display of the rainbow
Rainbow defects can quickly find the source of a microscope, if it is point-like, you can see under the microscope in three ways: a small number of particles in space, space particles agglomerate together, foreign body inside the box. Such defects, according to observations on, you can adjust the front right from the parameter space particle spreader, spreading segment and the combination of space particles and clean maintenance section both for prevention.
If the liquid crystal display are a rainbow, it is either within the space frame and the particle with the wrong box, or the number of particles is not enough space inside the box or not. Such defects, may check the spreading of the technology space particles in front of the material parameters, particle detection data, adjust the parameters for prevention.
If the frame is a box near the rainbow, or a frame packaging material contaminated by foreign bodies can be seen from the microscope, either into the box caused all Shouli Bu, need to check into the box equipment and maintenance. Into a box equipment failure, or in case of a foreign body caused by the process of the rainbow folder will also in the adjacent produce the same place a few slices of Newton ring product, that there will be regular.
2, the resistive touch screen and LCD module ripples between
To prevent water wave generation, firstly, to increase the intensity of resistive touch screen, for example, the original PC substrate is replaced by a greater pressure force afterburner or glass material, or from thin substrate, and replaced thick substrate. This is why more than a certain size resistive touch screen products will use 2MM glass thickness of glass or one of the reasons. All design parameters are justified, and not copying from the outside will be able to blind copy, if the unknown principle of blind copy, or a waste of materials and quality of your costs, or can not avoid their potential yield and product quality defects rate.
Second is to meet customer requirements in the case of resistive touch screen and liquid crystal display assembly of double-sided adhesive used between the thicker the thickness of the ring to move the Newton ring product size dark outside. Or resistive touch screen and LCD monitors are also printed on the assembly side support and the transfer of the external pressure to the liquid crystal display through the anchor and the housing board to reduce the resistive touch screen of the deformation, to prevent Newton rings, which is a wavy generated.
If the display of products to meet the demand, in terms acceptable to display, can also resistive touch screen surface combined with the liquid crystal display on the LCD monitor glare polarizer into the polarizer. Note that the close-glare polarizer polarizer display display than the average lot worse, especially over QVGA LCD display, if replaced, the display of detail design, response speed and contrast, are significantly decreased, so the end customer must determine the display before replacement.
3, the resistive touch screen of the Newton ring
Resistive touch screen it does to Newton ring prevention of trouble, because most of the operation of resistive touch screen surface, using a flexible ITO FILM substrate.
Resistive touch screen to prevent Newton rings, first in the ITO FILM quenching process, the choice of a good governance for their own tooling and equipment for modified treatment parameters, so that all parts of ITO FILM synchronous contraction, no contraction due to uneven produced uneven, or on the loading fixture is not transferred to the ITO FILM on the flat. The quenching by ITO FILM generated do not ring, has a very distinctive features, if it is combined and then fractionated products, after a good portfolio can not see the ring, but in the product 48 hours after the sub-grain left will appear.
Support points of the high degree of control is the main way to prevent Newton's rings by the above calculation, we can see that, to survive on the height above a certain value, it will be difficult to form the, or are widely spaced to be diluted So we must guarantee the anchor height.
Height of the supporting affirmation and support points attached to the area have a certain relationship, in the same conditions, the higher the altitude, the greater the support points attached to the area, for some fine-quality liquid crystal displays, the pixel size may be only 60 to 90 microns, the size if a strong point after more than half the size of pixels, then the pixel will have a display distortion, observed at a distance, can the layout of the support points emerge from the display screen. To solve this problem, the Japanese manufacturers in the narrow design of the small size products, the use of molds or add gasket combination, which allows the product filled the air, man-made increased the distance between the inner surface of products that avoid the appearance of Newton's rings , would not have to frame design is very complex and difficult to produce a ventilation channel, but also can design the anchor attached to a small area.
Defects in the way inflation is not used in the temperature environment of rapid change, or large-size products. In particular, water-based adhesive printed products, as design is narrow, and difficult to operate, resulting in lack of bond strength. After the drastic changes in temperature, it is likely to cause leakage, gas leakage, the effect is gone to avoid Newton's rings. Many manufacturers of products in the factory warehouse on their own thermostat there is no problem, get the customer's normal storage place for a week, or simply just after a motor transport, the product of Newton's ring phenomenon occurs, that is the reason. So inflation is not to deal with Newton's rings the traditional remedy of a fresh recruit, use of the product if you do not consider the conditions and environment, together with other auxiliary craft with it, would not achieve a real effect.
Resistive touch screen sensitive areas of the ring, the same material thickness is a combination of various techniques and hot temperature and pressure parameters of inappropriate FPC generated, basically you can adjust the thickness of FPC materials and hot pressing parameters can be resolved.
For those watching from the distant large-size display products, because the pixel size is relatively large, can use 50 to 60 micron size of the support points, support points unless it is printed or anchor a high degree of uneven subsidence, generally does not appear Newton ring phenomenon. V. Conclusion
Newton's rings, nothing more than parallel to the incident light and reflected light generated by mutual interference, such interference is only within a certain optical path difference will be revealed. To avoid the generation of Newton's rings, one approach is to disrupt the direction of light propagation, such as in resistive touch screen, use matte ITO FILM; in LCD polarizing films such as the use of glare; Another way is to ensure that the parallel surfaces, so that the radius of curvature within the table is large enough so that the dark Newton ring expansion to the product outside the loop region; there is greater difference between the two surfaces of the optical path, so that Newton's ring area falls on the dark ring Size Newton ring outside or to increase the distance between adjacent rings, dilute Newton rings. As long as the generation mechanism based on Newton's rings, in the production process to control the quality of Newton's rings is not a ghost.