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Large screen advertising screen [ 2019-08-23 ]

Using special LCD graphic design and process design and matching raw materials, this product features TN high contrast and wide viewing angle of STN, The maximum contrast ratio with backlight is 200:1, and the limit size is 385*340. And the reliability can be achieved in the characteristics of earthquake resistance, low temperature and high temperature resistance, and is mainly applied to airports, parking lots, public advertisements, and the like.

Stereo glasses display [ 2019-08-23 ]

Stereoglassesareusedtowatchstereoscopicmovies,TVs,andstereogames.Theresponsetimeofthedisplayisonlyafewmilliseconds、andtheswitchisfast,reachingthespeedoffastswitchingbetweentheleftandrighteyesoftheperson,andformingastereoimageinthehumanbrain.

Liquid crystal display module [ 2019-08-23 ]

The liquid crystal display module is a component that assembles a liquid crystal display device, a connector, an integrated circuit, a PCB circuit board, a backlight, and a structural member. The English name is “LCD Module”, referred to as “LCM”, and Chinese is generally called “LCD Module”. In fact it is a commercial part. According to the provisions of China's relevant national standards: only the non-detachable integrated components are called "modules", and the detachable is called "components",Therefore, the name of the specification should be called "liquid crystal display component"， But for a long time people have become accustomed to calling it a "module." The liquid crystal display device is a high-tech basic component. Although it is widely used, it is still difficult for many people to use and assemble. Especially for dot-matrix liquid crystal display devices, users will feel that they have no way to start. The special connection method and the special equipment required are also not known and possessed by everyone. Therefore, the user of the liquid crystal display device hopes that some people will work together to install the liquid crystal display device together with the control and driving integrated circuit to form a functional component. It can be assembled into a complete system using conventional processes. Broadly speaking, all components assembled by liquid crystal display devices and integrated circuits are "modules", but in fact, what we usually call "modules" mainly refers to dot matrix liquid crystal display modules assembled by dot matrix liquid crystal display devices，Especially because it is a dot matrix liquid crystal display device product, except for some special large-volume varieties (such as translation machines and communication), the manufacturer supplies liquid crystal display devices directly to users, and almost all general-purpose dot matrix liquid crystal display devices are It is only supplied to the user after being processed into a module, so it is easy to form a misunderstanding that the "liquid crystal module" is a "dot matrix liquid crystal module". First, digital display liquid crystal module This is a functional component that is assembled from a segment type liquid crystal display device and a dedicated integrated circuit, and can only display numbers and some identification symbols. Segment type liquid crystal display devices are mostly used in portable, pocket devices. Since some devices are small in size, the display portion is not designed as a separate component as much as possible. Even if some application areas require a separate display component, it should have some information reception, processing, and Functions such as storage delivery are popular in the market because of their general, specific features. The common digital display LCD modules are as follows. 1. Counting module This is a counting display unit assembled by a seven-segment type liquid crystal display device and a decoding driver of different numbers of bits, or a counter. It has the ability to record, process, and display numbers. At present, the main products that can be seen on the market in China are the unit liquid crystal display device display module driven by CD4055 decoding driver, and the integrated circuit of ICM72ll, ICM7231, ICM7232, CDl4543, UPDl45001, HD44100 and the corresponding matching liquid crystal display device. 4-, 6-, 8-, 10-, 12-, 16-bit counting modules. The following points must be noted when selecting such a counting module: (1) Find out the function: Although it is called “counting module”, most of them cannot be counted directly. Some of their input ports are only BCD code interface forms, some are BCD code plus strobe input interface form, and some are interface forms that can be directly connected to serial and parallel ports, etc., if you need to calculate or record one The serial number must also be configured with the corresponding circuit. Of course, there are products that have the counting circuit on the module. (2) Look-aware structure: Liquid crystal display devices have different mounting methods and mounting structures. Therefore, in the selection, attention should be paid to its structural characteristics, Generally, such counting modules are mostly made up of zebra conductive rubber strips, plastic (or metal) press frames and PCB boards to assemble liquid crystal display devices and integrated circuits. The outer lead ends are solder joint type, pin type, and circuit board pin type. (3) Pay attention to the power supply: One device should use a unified power supply as much as possible. The common LCD display device counting modules are single-supply type and dual-supply type, and have different specifications such as 5V and 9V. 2. Metering module This is a module assembled with a multi-segment type liquid crystal display device and an integrated circuit chip having decoding, driving, countin

Troubleshooting in use [ 2019-08-23 ]

When a qualified liquid crystal display device is used, it may sometimes malfunction due to unreasonable use, unsuitable conditions, unqualified accessories, or improper installation methods. The reasons and troubleshooting are as follows: 1. "writing" exclusion After a few hours or days of use, the electrode is discolored and appears black and brown "writing", and the liquid crystal cell generates bubbles so that it cannot be displayed. This is due to the fact that the DC component of the driving voltage is too large, causing an electrochemical reaction. Check the circuit and replace the large DC component with a new liquid crystal display device. When the "writing" is just present, the liquid crystal display device can be heated to a temperature above the storage temperature. Even if the display surface of the liquid crystal display device is all black, the temperature rise is stopped, and after the natural cooling, the "writing" can be generally removed. 2. Vaguely revealed exclusion After the assembly, the pen segment that should not be displayed is also faintly displayed, so that it cannot be read. The reason may be: (1) The leads are not clean. Wipe it off with a dry cloth; (2) The weather is too hot and the glass surface is conductive. It can be restored after drying indoors; (3) The common electrode or the segment electrode is suspended, and after reinstallation is reliable, it can be eliminated; (4) The amplitude of the AC square wave is asymmetrical, which causes the cutoff to be unclear, and the square wave amplitude can be solved; (5) The conductive rubber stripe is not square, non-parallel, and the insulation performance is poor. Replace the conductive rubber strip. 3. Negative contrast exclusion Poor contrast, or negative image, or display confusion, or all display, generally due to the back electrode floating, can be eliminated. 4. Exclusion of confusion display External disturbances may also cause display confusion and eliminate interference. 5. Exclude all displayed The decoder is normal, but all pixels are displayed. Generally, the back electrode is not connected, and the floating or back electrode is connected to DC. 6. Reasons for missing strokes and their exclusion (1) The electrode lead is contaminated, resulting in poor assembly contact. (2) The conductive rubber is contaminated, resulting in poor assembly contact. The above two items only need to be cleaned and reassembled. Do not touch the cleaned parts with your hands during assembly. (1) The edge of the glass is broken and the outer lead conductive layer is scratched. (2) The assembly pressure frame is not suitable. 7. Irregular irregular display The cause of the confusion may be: the back electrode is suspended, the drive is DC, the power supply fluctuates, the contact is poor, the battery is exhausted, and the like, Can be excluded for different reasons. 8. Intermittent display exclusion The function is turbulent, can't be adjusted, and the display is intermittent. The reason is that the power supply voltage is abnormal and the battery is exhausted. At this time, the battery needs to be replaced.

Simple fault inquiry [ 2019-08-23 ]

In order to find out the fault of the liquid crystal display device during use, you can use the pointer multimeter R=10kΩ resistor to search. This is a high-resistance file, which can check various on-off and off-state conditions that affect the display, because it has The DC voltage of 9-15v can drive the display of the liquid crystal display device to judge whether the display device is normal or not from the display state. However, since the multimeter outputs a DC voltage, it is preferable not to delay the detection for a long time to avoid an electrochemical reaction. You can use the following tricks to reduce the damaging effect of DC, that is, hold a test pen in your hand, then hold the liquid crystal display back electrode with your fingers, and then use another test lead to detect the remaining segments of the electrode. The internal resistance of the external power supply is greatly increased, thereby reducing the damage of the DC component.

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