Commercial LED screens have different luminous angle ranges, in the case of chip brightness has been set, the smaller the commercial LED screen luminous angle, the brighter the commercial LED screen, but the commercial LED screen field of view is smaller. In two-dimensional display applications, the general choice of 100 ° LED ensures that the commercial LED screen sufficient viewing angle can be. But for the true three-dimensional display, to allow multiple users to simultaneously view the three-dimensional image at different angles, to achieve the horizontal direction 360 visible, the commercial LED screen selected luminous angle should be the larger the better.

In addition, a commercial LED screen has directional makes a full-color commercial LED screen also has angle directional, that is, at different angles of viewing, its brightness will increase or decrease. Thus, the angle consistency of red, green, and blue LEDs will seriously affect the consistency of white balance at different angles, which directly affects the fidelity of the image displayed on the display.

Make the commercial LED screen stationery, that is, in the two-dimensional display state, the screen R, G, and B three-color light distribution curve measurement. Commercial LED screen light distribution curve, that is, the distribution of light emitted from the light source in space usually refers to the distribution of light intensity. The commercial LED screen is facing the luminance meter as the initial position, every 10 ° turn to record the luminance of R, G, and B three colors. The measurement distance is 1m, the measured light distribution curve is shown in the figure below:

As can be seen from the figure, the light intensity distribution of the red light tube is basically symmetric about its optical axis, the intensity has been decreasing with the increase in the angle of the screen turned. Green and blue are intensity first decreases with the increase in angle, turns to a certain angle, began to enhance with the increase in angle, and then turns to a certain angle, and then decreases with the increase in angle. Green in 40 ° after the light intensity with the increase in angle and significantly enhanced, the left and right distribution are not completely symmetrical, on the left, between 50 ° to 60 °, the intensity remains basically unchanged, after 60 ° down significantly, in close to 90 °, the light intensity has been significantly reduced, but still have a certain intensity. While on the right, between 50° and 60°, the intensity decreases significantly, and near 90°, it has basically decreased to 0. Blue in 50° after the angle of light intensity although the increase and obviously enhanced, 60° when the maximum, 70% after a sharp decline in the distribution of left and right asymmetrical, on the left, 80° when the intensity has been very weak, near 90°, basically 0, while on the right, 80°, although it has significantly decreased, still has a certain intensity, the light intensity near 90° is also stronger than the light intensity at the same angle on the left.

For a fixed position of the observer, a comprehensive red, green, and blue light-emitting characteristics, within its 120 viewpoints (60 ° left and right), watching the image brightness is relatively bright, in this angle range outside the image will be dark. Red, green, and blue light-emitting tubes of this light distribution characteristics will cause two problems: First, because the shape of the three-color light distribution curve is not exactly the same, the impact of brightness uniformity will also have an impact on color uniformity. Second, when the screen is turned 90 °, the light intensity distribution of the three colors is very small, the human eye to receive the light intensity is very weak and will form a dead zone during the observation.

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