What are the main parameters of the quality evaluation of the touch machine?
The touch all-in-one is a touch product that bundles the touch screen and related software together with external packaging for query purposes. The touch all-in-one machine has truly integrated the function of touch and control, greatly improving people's work efficiency.
As an input device, the touch all-in-one has many advantages such as ruggedness, fast response, space saving, and easy communication. As long as the user touches the screen of the machine lightly with a finger, the user can quickly get the information he wants, thereby making the human-computer interaction more straightforward. As a high-tech machine, the touch all-in-one has gradually replaced the status of a simple touch screen, so that users can truly feel the characteristics of human-computer interaction.
The evaluation of professional parameters of a touch all-in-one machine mainly includes the following aspects:
1. Contrast:
Contrast is actually the ratio of the maximum brightness value divided by the minimum brightness value, which represents the color gradation that the LCD can display. Nowadays, touch all-in-ones are more and more used in professional fields such as education and training, and users have increasingly higher demands for contrast. The "Specifications for the Construction of Multimedia Teaching Environment Engineering" adopted by the Ministry of Education and drafted with the participation of the Sivo brand indicates that the LCD contrast ratio is generally between 1000: 1 and 1600: 1. There is another concept here, dynamic contrast, which refers to the measured contrast value under certain specific conditions, which is generally 3 times the contrast.
2. Brightness:
The liquid crystal itself does not emit light, so the maximum brightness of an LCD usually depends on the backlight. Currently, there are mainly two types of backlight sources: cold cathode ray tubes and LED diodes. For LCDs, the first-level specifications can reach more than 350cd / m2, which fully complies with the effective brightness of 300cd / m2 in the "Specifications". If the brightness is too low, the screen will feel dark. It should be noted that, in actual use, the brightness is not as high as possible, the brightness of the display screen is too high, and prolonged use is prone to visual fatigue.
3. Response time:
Response time refers to the speed at which the LCD pixels react to the input signal. The response time is too long, and there will be a drag when displaying moving images. The response time of general LCD display is between 20 ~ 30ms. With the continuous improvement of technology, the response time of many brands' display screens has been controlled very well, which has improved the disadvantage of traditional touch all-in-one devices.
Of course, there are other important factors that determine the display effect of the touch all-in-one.
LCD card driver technology is a very critical one. During operation, the liquid crystal drive uses an electric field to change the state of the liquid crystal, control how much light penetrates, and the voltage has a negative correlation with how much light penetrates. Therefore, the liquid crystal driver controls the brightness of the light through the level of the voltage applied to the liquid crystal. No matter how high the technical parameters of the LCD screen, in the end still depends on the LCD card driver to achieve a perfect display. In this technology, Chinese companies have done very well. The world's largest independent LCD panel driver design company is the CVT Group from China.
Another key technology is the signal transmission method. The same display screen adopts HDMI full digital high-definition transmission, which can greatly reduce the damage and distortion of the video signal during transmission. Compared with the VGA analog signal transmission, there will be a very large difference in display color and dynamic effects.
To sum up, the display effect of the LCD in the touch all-in-one machine depends not only on its own technical parameters, but also on the LCD panel card driving and signal transmission technology. Only products that can achieve a high level in these two aspects can provide users with the best presentation effects and viewing experience.
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Official website: www.kwhtouch.com
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As an input device, the touch all-in-one has many advantages such as ruggedness, fast response, space saving, and easy communication. As long as the user touches the screen of the machine lightly with a finger, the user can quickly get the information he wants, thereby making the human-computer interaction more straightforward. As a high-tech machine, the touch all-in-one has gradually replaced the status of a simple touch screen, so that users can truly feel the characteristics of human-computer interaction.
The evaluation of professional parameters of a touch all-in-one machine mainly includes the following aspects:
1. Contrast:
Contrast is actually the ratio of the maximum brightness value divided by the minimum brightness value, which represents the color gradation that the LCD can display. Nowadays, touch all-in-ones are more and more used in professional fields such as education and training, and users have increasingly higher demands for contrast. The "Specifications for the Construction of Multimedia Teaching Environment Engineering" adopted by the Ministry of Education and drafted with the participation of the Sivo brand indicates that the LCD contrast ratio is generally between 1000: 1 and 1600: 1. There is another concept here, dynamic contrast, which refers to the measured contrast value under certain specific conditions, which is generally 3 times the contrast.
2. Brightness:
The liquid crystal itself does not emit light, so the maximum brightness of an LCD usually depends on the backlight. Currently, there are mainly two types of backlight sources: cold cathode ray tubes and LED diodes. For LCDs, the first-level specifications can reach more than 350cd / m2, which fully complies with the effective brightness of 300cd / m2 in the "Specifications". If the brightness is too low, the screen will feel dark. It should be noted that, in actual use, the brightness is not as high as possible, the brightness of the display screen is too high, and prolonged use is prone to visual fatigue.
3. Response time:
Response time refers to the speed at which the LCD pixels react to the input signal. The response time is too long, and there will be a drag when displaying moving images. The response time of general LCD display is between 20 ~ 30ms. With the continuous improvement of technology, the response time of many brands' display screens has been controlled very well, which has improved the disadvantage of traditional touch all-in-one devices.
Of course, there are other important factors that determine the display effect of the touch all-in-one.
LCD card driver technology is a very critical one. During operation, the liquid crystal drive uses an electric field to change the state of the liquid crystal, control how much light penetrates, and the voltage has a negative correlation with how much light penetrates. Therefore, the liquid crystal driver controls the brightness of the light through the level of the voltage applied to the liquid crystal. No matter how high the technical parameters of the LCD screen, in the end still depends on the LCD card driver to achieve a perfect display. In this technology, Chinese companies have done very well. The world's largest independent LCD panel driver design company is the CVT Group from China.
Another key technology is the signal transmission method. The same display screen adopts HDMI full digital high-definition transmission, which can greatly reduce the damage and distortion of the video signal during transmission. Compared with the VGA analog signal transmission, there will be a very large difference in display color and dynamic effects.
To sum up, the display effect of the LCD in the touch all-in-one machine depends not only on its own technical parameters, but also on the LCD panel card driving and signal transmission technology. Only products that can achieve a high level in these two aspects can provide users with the best presentation effects and viewing experience.
---------------------------------------------------------------------------------
Recommended related products
KONWHAI -- Touch Screen kiosk, click to enter to understand
KONWHAI -- LCD advertising machine, click to enter to understand
KONWHAI -- Smart meeting whiteboard, click to enter to understand
Official website: www.kwhtouch.com
---------------------------------------------------------------------------------
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