The "polishing technology" used to display it makes the eyes to be light, "stabbed", also easily lead to eyestrain, headaches and even lead to vision loss and other health problems. High brightness on the one hand easily cause visual fatigue, but also to reduce the black and white contrast, the impact level, and the gray scale. Survey showed that the brightness of conventional CRT TV 300-600cd/m2, while the brightness proved so in the 20-35 inch screen size is sufficient to meet the requirements of visual appreciation. Currently, most TV's brightness on the market in 450-600cd/m2 about the individual to 800cd/m2, 1000cd/m2 or even higher, it has been able to meet the needs of most consumers. Select the appropriate brightness and viewing distance has a lot of television, big screen TV viewing distance is relatively large dell vostro 1000 battery, high brightness for selected models, and small-screen TV is not too much should choose the brightness of the product. The general brightness of the ideal reference for the selection criteria can be rough, that is not higher than 2200 * screen height squared, and not less than 1800 * screen height squared (height of the screen into the first international standard units: meters). Brightness uniformity is also very important, but in the LCD TV product specifications, there is usually not to mark. Brightness uniformity or not, and backlight with mirror closely related to the number and configuration, better quality TV, the screen brightness uniformity, no obvious dark area. Uneven screen brightness will seriously affect the appreciation of the method to determine the brightness uniformity is usually only careful observation, especially in the color-screen single apple macbook pro 17 inch series battery best opportunity from time to time, the selection of LCD TVs may wish to request receiving personnel will be transferred into a single color screen to identify.