How To Choose An LCD Screen? How To Test?
11/3/2023
Written By Super Duan On 3rd November 2023
With the development of technology, we have more and more displays, one of the most popular is the LCD. So when we buy an LCD monitor, how do we know it's good or bad? And how is it detected?
The Choice Of LCD Display
1. Brightness/contrast ratio
LCD monitor Brightness in square candle (cd/m2) or nits (lumens) as a unit, LCD monitor due to the number of backlights than the number of laptop monitors, so the brightness looks significantly brighter than the laptop. Its brightness is generally between 150nits and 500nits. The high brightness value certainly indicates that its product performance is higher.
2. Viewing Angle
Because LCD is the use of light transmission to display, so there is a perspective problem, so the ordinary LCD has a disadvantage is a small viewing angle. In LCD, direct and oblique light will penetrate the pixels of the same display area, so when viewing the screen from an angle greater than the viewing angle, you will find that the image has ghosting and discoloration. Therefore, the viewing angle refers to the maximum angle of the LCD screen image can be clearly seen, the larger the viewing angle is the better.
3. Response time
Signal response time refers to the pixel from light to dark and then from dark to light time required. Response time reflects the speed of the response of the LCD pixels to the input signal, the smaller the value, the better, the response time of most LCD monitors in the past between 20 and 100ms, but now the new models can do within 20ms. The smaller the response time, the motion picture will not make the user have the feeling of tail shadow.
4. Size
The size of the monitor is the length of the diagonal of the picture tube, the unit is inches (1 inch = 2.539 cm), and the size of the LCD and CRT monitor is different, its size is generally true display size, the main size of the LCD monitor on the market are 13.3, 14, 15, 17, 18 inches, etc., LCD monitor price is mainly determined by the size of the LCD screen.
5. Resolution
LCD and CRT monitor is different, it has a fixed resolution, only in the specified use of the resolution of its picture quality is the best, in other resolutions can be extended or compressed way, the picture will be displayed.
How To Check The LCD Monitor？
1. Check the LCD with a soft wire
With a soft wire can easily check the LCD digital screen good or bad. The method is to take a 30-46cm long soft wire, close to the 50Hz AC power line (such as a desk lamp power line), one end of the suspension, one end of the wire plastic skin (2cm) stripped, the exposed copper wire part of the twist tight. Then, use your finger to contact the common electrode of the LCD digital screen, and use the wire (by twisting tight) of the copper wire part in turn to contact the stroke electrode (fingers do not touch the wire room out of the copper wire part), if the digital screen is good, it will be able to display the corresponding stroke in turn.
2. Using a multimeter for simple inspection of the LCD screen
Using a multimeter to LCD for simple inspection will be placed on the multimeter Rx1kΩ file, then the multimeter is generally used in 1.5 V. Any one of the two table sticks fixed contact in the LCD public electrode, the other table cupped in order to move to contact the pen electrode lead line. This one moves in turn to contact the table body, contact to a stroke lead line, the stroke should be displayed. In this way, you can simply check whether the LCD screen has a pen (that is, some strokes together), broken pen (a stroke can not be displayed), and can compare the contrast strength of different displays, afterglow time length and so on.
The above is how to choose the LCD display and LCD display how to detect the introduction, please feel free to consult CY Digital Signage if you have any questions.
Super Duan
Super Duan is a Product Manager at CY Digital Signage.