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The view of LED display screen brightness uniformity of the influence

 

Because of the Angle of view of problems LED itself, the LED display brightness would with view changes, the influence of the display screen display effect. From the point of view of different observer watching display, the brightness of the change will be LED display brightness uniformity negative effects.

 

The LED display in be used actually, in a certain range will observer to screen for observation. In an effort to 1, for example, suppose the observer in the observation position 1, observe the position 2, 3 to observe position LED display for observation, the observer in observing position 1, observe the position 2, 3 view axis of observation location and figure 2 shows the display area 1, display area 2, display area 3 axis superposition.

In the observation location one, the display area 1 brightness is the largest, display area 3 brightness minimum, display area the brightness of the 2 something in between; Observe the position 2, display area the brightness of the 2 biggest, display area 1 and display area of the three basic same brightness, but less than display area the brightness of the 2; Observe the position 3, display area the brightness of the three largest, display area 1 brightness minimum, display area the brightness of the 2 something in between. Although the three display area LED the luminous intensity distribution curve Angle is same, but because of the influence of LED Angle, resulting in the same observation location, three regional brightness values are not all the same.

Display area 1, observe the location of a maximum brightness when, in observing position 3 when the minimum brightness, in observing position 2 when something in between brightness; Display area 2, in observing position 2 brightness is the largest, in observing position 1 and observing position 3 when brightness basic same, but less than in observing position 2 brightly the; Display area 3, in observing position 3 when the maximum brightness, observe the location of a minimum brightness when, in observing position 2 when something in between brightness, so the LED display the same area with the brightness view different change.

 

According to the luminous intensity distribution curve Angle LED the change rule, to observe position 1, observe the position 2, observation location on the LED display 3 whole screenful brightness distribution simulation. The LED display brightness distribution shown as shown in figure 5. Figure 2 (a) is the simulation in observation position 1 observed the LED display brightness distribution. Figure 2 (b) is the simulation in observation position 2 observed the LED display brightness distribution. Figure 2 (c) is observed in the simulation position 3 observed the LED display brightness distribution.

In a certain range of observation, the LED display of the adjacent area change in the intensity of size is luminous intensity by the angular distribution curve of the slope of the decision. The luminous intensity distribution curve Angle the curvature of the big, and the adjacent area LED the brightness changes; The luminous intensity distribution curve Angle the curvature of the small, and the adjacent area LED the small change brightness. Brightness to observe in the projection screen location to the right, in concentric circles distribution, central place the most bright, with the increase of the radius of the brightness and decrease, the brightness of change and the luminous intensity distribution curve Angle the curvature of the relevant.

For three of the brightness distribution was analyzed, it can be seen that observation location of a position of 3, observe the LED display different display area of the highest and the lowest brightness difference brightness is bigger, so in observing position 1, observing position 3 observed by the LED display brightness the gender is poorer. Observation of the observation of the position 2 LED display different display area of the highest and the lowest brightness difference brightness is small, so in observation position 2 observed by the LED display brightness of the gender is good. But two of the observation of observation location LED display brightness uniformity are far lower than by the LED display test method, measured the LED display brightness uniformity.

 

In ideal condition, the observer in different locations observe the LED display, have been observed by different positions of the screen brightness data uniformity, by these data constitute a figure 3 3 d distribution. Through the analysis of figure 3, the observer in the LED display center observation, the LED display brightness uniformity is best, but the center of the observation of the observation area LED display brightness uniformity are far lower than by the LED display test method, measured the LED display brightness uniformity. In the edge position observe the LED display, brightness the gender is poorer. Observation location and center observation area the farther the distance, the LED display screen brightness uniformity of the poor.


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