Character LCD Modules : The capacitive screen Drift failure of the approac

LCD modules: The capacitive screen Drift failure of the approac...: Option One: 1, turn off the phone, remove the battery, the phone is allowed to stand for about five minutes 2, to find a USB cable, conne...

The capacitive screen Drift failure of the approach oled module

Option One:
1, turn off the phone, remove the battery, the phone is allowed to stand for about five minutes
2, to find a USB cable, connect your phone
3, wash your hands, or handle wet (key steps, in order to better export to the electrostatic)I2C LCD display
4, your hands are wet state the same below the thumb of one hand contact with the metal part of the USB cable to the other end of the index finger to the ground for about 2 seconds (preliminary outgoing)
5 Open the back cover we can see a small piece of metal in the battery compartment next door, this is the phone to vibrate generator, commonly known as shock sub. As it is also directly connected to the main board of the phone, we can do the same, your hands are wet state the same below the thumb of one hand contact with the shock sub index finger to the ground for about 2 seconds.
Option Two:graphic LCD
Recent screen always drift, that is, the screen is inexplicable confusion and chaos, points are not allowed to, monitoring is not a so-called ROM, but for physical reasons, the following analysis.
With irons, I have solved the problem, and want to be able to help bring oil to encounter this problem.
Methods: HD2 battery removed, irons energized Pressing on the sheets, the sheets, the temperature should be moderate, remove the irons HD2 screen Flip on the heat sheets, screen cover hot (or temperature should be moderate, not repeat), and so forth about 5 times.

Capacitive screen drift TFT Display Module

1. Electrostatic
Dependent on the electric field due to the capacitive screen to locate, so very slight static, it will lead to "drift", if there is an electrostatic discharge, and may even permanently damage the capacitive screen.STN display
2 Magnetic Field
Magnetic field generates an electric field, the capacitive screen "drift" phenomenon in a strong magnetic field, the magnetic field is too strong or in a strong magnetic field for a long time, and even permanent damage to the capacitive screen.
3 conductive material
Attached to the conductive material on the screen, such as oil, perspiration, water vapor, etc., will cause drift, if accidentally damage capacitive screen, and other components into the inside of the screen.
Ambient temperature and humidity
Capacitive screen the optimum operating temperature is 5-35 degrees, and the humidity is 30% -90% non-condensing, does not meet the conditions of work appears to drift. Capacitive screen storage temperature is -20 degrees -60 degrees in the high or low temperature storage, transportation will damage the capacitive screen. Prolonged exposure to sunlight or any length of time in the high temperature environment may permanently damage the screen. Charge causes the screen fever, wait a lower temperature before using.
5.Voltage
Low battery voltage or voltage instability may lead to a capacitive screen drift. Use of high-quality battery and voltage problems can be avoided due to drift in a timely manner to charge the phone.COG LCD module
6 physical damage
Shock and vibration will destroy the silica glass protective layer, causing permanent damage to the capacitive screen. Cause drift even screen scrapped. Storage, transportation, avoid sharp shock and collision; eliminate strong percussion, thereby protecting the capacitive screen and prolong life.

Capacitive touch screen drift theory oled module

Capacitive touch screen itself is actually a sophisticated leakage sensor, gloved hand can not touch, resulting in the use of capacitively drift. Capacitive screen and electric female screen are electrical schematic work, electrical work for multi-touch, no matter how many points, whether continuous or discontinuous are to take multi-touch the center point of judgment, because the current superimposed can not tell who is who, no way.Embedded LCD display
Proceed in accordance with the basic principles of the ideas, but ran into insurmountable obstacles: the transparent conductive material ITO - metal oxide is very fragile, and touch can be damaged, can not be directly used as the working layer. Material for a moment, difficult to resolve, had to make compromises: the increase in the external layer of very thin hard glass, it is clearly not conductive, DC is to die in favor of high-frequency AC signal by human fingers (separated by thin glass) and the face coupling capacitor sucked an AC current, which is the origin of the name "capacitor" capacitive screen.
The first is the "drift", because the way of the coupling capacitor is unstable, it is directly affected by the temperature, humidity, wet fingers, the body weight, the ground the degree of drying, affected by the interference of the large external area of ​​the object is also very large, brought no stable results, which are in direct contravention of the basic requirements of the touch screen as the absolute coordinate system, the inevitable drift, some capacitive touchscreen desire through a 25-point calibration method or even 96-point calibration method to solve the drift problem, in fact, is not may drift decision capacitor work this way, even if it is a in controller single procedure using dynamic calculation and experience the value of the look-up table, can only be a temporary solution. Multi-point calibration method first large-screen projection touchpad method used, the purpose is to eliminate the lines xing distortion of coordinates correspond capacitive touch screen line xing distortion is also very powerful, mainly because the calculation of the capacitive screen built in four of the amount of current and touch point to the ideal state of the four electrodes proportional to the distance on the actual due Setting capacitors, circuit parasitic capacitance and the use of different, That proportional relationship can not be completely linear, multi-point calibration method can only be resolved local assigned line xing the problem, not solve the overall drift.TFT display module

Resistive touch screen oled module

This touch screen is controlled using a pressure sensing. A main part of the resistive touch screen resistive films screen is a very complex piece with the display surface, which is a multi-layered composite film as primary layer of glass or hard plastic plate, the surface coated with a layer of transparent metal oxide (transparent conductive resistance) of the conductive layer, above and then cover with a layer of outer surface hardening treatment, smooth plastic layer anti-rub, and its inner surface is also coated with a layer of coating, between them, have many of the small (less than 1/1000 inch) transparent the isolation point the two conductive layers separated by insulation. When the finger touches the screen, the two conductive layers on the touch point there will be a contact resistance change signal is generated on the X and Y directions, and then send the touch screen controller. The controller detects the contact and to calculate the position (X, Y), according to the operation of the simulated mouse. This is the basic principle of the resistive touch screen technology. Resistance class touch screen key material, commonly used transparent conductive coating material:
A, ITO, indium oxide, a weakly conductive body, characteristics when the thickness is reduced to 1800 angstroms (Å = 10-10 m) or less, will suddenly become transparent, the light transmittance was 80%, and then thin down light transmittance but The rise again decreased to a thickness of 300 angstroms to 80%. ITO is all resistive touch screen technology and capacitive touch screen technology are the main materials used, in fact, the resistive and capacitive touch screen technology Face ITO coating.lcd
Nickel gold coating, five-wire resistive touch screen of the outer conductive layer is good ductility nickel deposit coating materials, conductive outer layer due to frequent touch, use a good ductility nickel deposit materials in order to extend the life of , but the technology costs more expensive. Nickel deposit conductive layer scalability, but only for transparent conductors, not suitable as the face of the resistive touch screen, because of its high conductivity, and the metal is not easy to do very uniform thickness, suitable for voltage distribution layer, and only as a probe layer.lcd graphics

Around the lcd features TFT Display Modules

Low-voltage micropower
Small and exquisite appearance, the thickness of only 6.5 to 8mm
Passive display type (no glare, does not irritate the human eye does not cause eye fatigue)
lcd Display a large amount of information can be made very small (because pixels)
Easy to color-based (on the chromatogram can be very accurate reproduction)
Electromagnetic radiation (human security, conducive to the confidentiality of information)
Long life (this device is almost nothing deterioration, extremely long life, but the life of the LCD backlight can be replaced, but the backlight part)

These are the technical parameters of the Character LCD Modules

Viewing area
The size indicated on the LCD display screen is actually can use the same range. For example, a 15.1-inch LCD monitor is approximately equal to the visual range of a 17-inch CRT screen.
Viewing Angle
LCD viewing angle, symmetrical, up and down is not necessarily symmetrical. For example, when the the backlight incident light through the polarizing plate, a liquid crystal alignment film, the light output will have a lot of the directional characteristic, that is, most of the light emitted from the screen with a vertical direction. From a very oblique angle to watch a full white screen, we may see a black or color distortion. Generally, the vertical angle is less than or equal to the right at an angle. If the visual angle of about 80 degrees, which means that you can clearly see the screen image begins with the the screen normal 80 degrees. However, due to the range of vision, if there is no standing within the optimal viewing angle, can see the color and brightness there will be errors. Some manufacturers on the development of a variety of wide viewing angle technology, trying to improve the viewing angle characteristics of the liquid crystal display.LCD module
Dot pitch
We often ask to the dot pitch of the liquid crystal display is much, but most people do not know how the value is obtained, let us now take a look at whether it is how to get. For example, the general 14-inch LCD viewing area 285.7mm × 214.3mm, its maximum resolution to 1024 x 768 dot pitch equal to: the visual width / horizontal pixels (or the visual height / vertical pixels) that 285.7mm/1024 = 0.279mm (or 214.3mm/768 = 0.279mm).Tsingtek
Degree of color
LCD, of course, is the degree of color performance. We know the nature of any kind of colors are red, green and blue three basic color composition. By 1024 × 768 pixels on the LCD panel imaging, each independent of the color of a pixel is composed of red, green, and blue (R, G, B) controlled by the three basic colors. Most of the manufacturers of liquid crystal displays, each of the basic colors (R, G, B) of 6 bits, i.e. 64 kinds of performance of each individual pixel, there are 64 × 64 × 64 = 262144 colors. There are also many manufacturers have spent so-called FRC (Frame Rate Control), the simulation exhibit full color screen, that is, each of the basic colors (R, G, B) to 8 bits, i.e. 256 performance , then it is up to each individual pixel 256 × 256 × 256 = 16777216 colors.