Medical Instruments LCD Fault Diagnosis and Maintenance – Liquid Crystal Display – Medical Devices Industry
With the LCD in medical instruments and equipment on the extensive application of medical equipment engineers to understand and master the liquid crystal display unit of the common faults and maintenance of value and meaning.
1. LCD display features and structure
1.1 LCD features (1) low-voltage, micropower :2-3V can work.
(2) Flat structure: The basic structure of liquid crystal display device is made of two thin glass box, this structure can accommodate a limited area on the maximum amount of display content, display utilization highest.
(3) passive-type display: liquid crystal display device itself does not light, it is modulated by external light to display purposes. That there was no glare, does not stimulate the human eye, does not cause eye fatigue. For the dark can not see the shortcomings, if coupled with backlight, can be overcome.
(4) shows large amount of information: in comparison with the CRT, liquid crystal display device does not mask limits, so pixels can be done smaller, more refined; compared with plasma display, liquid crystal display pixel point does not need such as plasma display as pixels to leave enough room between the isolation zone. Therefore, the liquid crystal display the size of the display window in the same area, it can accommodate more pixels, display more information.
(5) easy to color: the LCD itself, though generally not the color, but color of it is easy to achieve. More general use is color filter method and interferometry. As the color filter method mature technology, so LCD color of a more precise, more bright color and no color distortion of results.
(6) Long life: liquid crystal material is a polymer composite material. Has a very high purity, and other materials are also high-purity substances, in very clean conditions made of. LCD driving voltage is low, the drive current is negligible, so that almost no degradation of the device, life is very long. From a practical application test, general use, in addition to impact, broken or damaged fittings, the liquid crystal display device itself is almost no end of life (LCD backlight life is limited, we normally refer to the LCD backlight life of the life of the main i.e. , but the backlight module is replaceable).
(7) no radiation, no pollution: the use of liquid crystal display devices like CRT will not use the soft X-rays and produce electromagnetic radiation. This radiation is not only pollute the environment but also generate information disclosure, while LCD does not produce such problems, it is for the safety and confidentiality of information is ideal.
1.2 LCD basic structure Common structure of liquid crystal display to TFT-LCD speaking, key components, including glass substrates, liquid crystal materials, color film (color filter), polarizer, backlight module, driver IC, ICO conductive film, etc. . First of all, the light from the backlight shines polarizers, the light passing through polarizers, it will be polarized, polarized light will pass through liquid crystal, because the liquid crystal molecules are arranged by the electrode voltage effect Therefore, liquid crystal can change the angle of polarization of light polarization, different angles of polarization of light intensity caused by them will be different, with different intensity of light through the color film and then the red, blue, green, 3 pixels, it will show a variety of different brightness and different colors of pixels, each pixel Finally, by the naked eye can see the composition of the various images and graphics.
2. LCD display Fault Liquid crystal displays almost no degradation, long life, real life is the decision of LCD backlight modules. Currently used in LCD backlighting by technology, for mainly halogen, light emitting diode (LED), electroluminescent (EL), cold cathode fluorescent lamp (CCFL), cathode emission lamp (CLL) and metal halide lamps, etc. . Which is the most widely used cold cathode fluorescent lamps, mainly because such a backlight performance, stability and cost are better, now used by almost all LCD monitors use this backlight.
I looked up some information on companies, the statistics of the current liquid crystal displays commonly used cold cathode fluorescent lamp life hours of the basic as 30000-50000. OD 2.6-3.0mm, tube voltage 500-1000V, the lamp current 5mA. Lamp power 0.5-7.0W, start voltage 300-1500V.
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