Light emitting device and display equipment

A display equipment, comprising a light emitting source and an optical lens, the light emitting source comprising a light emitting surface, the optical lens being a rotating symmetric body arranged above the light emitting source, the optical lens comprising a light incident surface and a light emergent surface, wherein the light incident surface comprises a free-from concave surface, and the light emergent surface comprises a free-form convex surface;

• in the case where a symmetry axis of the optical lens goes through a centre point of the light emitting surface of the light emitting source, there is a first angle between the symmetry axis and a connecting line between the center point of the light emitting surface and any point on the light incident surface, and a curvature of the light incident surface decreases with an increase of the first angle;
• there is a second angle between the symmetry axis and a connecting line between the center point of the light emitting surface and any point on the light emergent surface, and a curvature of the light emergent surface increases with an increase of the second angle;
• the optical lens further comprises a bottom surface connecting the light incident surface and the light emergent surface;
• the light emergent surface further comprises an inward inclined surface, a generatrix extension line of the inward inclined surface intersects with the symmetry axis of the optical lens;
• the inward inclined surface is connected with the bottom surface;
• supporting feet are arranged on the bottom surface to support the optical lens, so that the optical lens is separated by a certain space from the substrate.

A light emitting device, comprising a light emitting diode (LED) and an optical lens, the LED comprising a light emitting surface, the optical lens being a rotating symmetric body arranged above the LED, the optical lens comprising a light incident surface and a light emergent surface, wherein the light incident surface comprises a free-form concave surface, and the light emergent surface comprises a free-form convex surface;

• wherein:
• in the case where a symmetry axis of the optical lens goes through a centre point of the light emitting surface of the LED, there is a first angle formed between the symmetry axis and a connecting line between the center point of the light emitting surface and any point on the light incident surface, and a curvature of the light incident surface decreases with an increase of the first angle;
• there is a second angle between the symmetry axis and a connecting line between the center point of the light emitting surface and any point on the light emergent surface, and a curvature of the light emergent surface increases with an increase of the second angle,
• wherein the first angle and the second angle are not greater than 90°;
• the optical lens further comprises a bottom surface connecting the light incident surface and the light emergent surface;
• the light emitting device further comprises a substrate;
• a distance between a point where the light incident surface intersects with the symmetry axis of the optical lens and a point where the light emergent surface intersects with the symmetry axis of the optical lens is a first distance, 0.5 mm≤the first distance≤1.5 mm;
• a maximum distance between any point on the light emergent surface and the symmetry axis of the optical lens is a second distance, 6.5 mm≤the second distance≤8.5 mm;
• a minimum distance between the bottom surface and the substrate is a third distance, 0.2 mm≤the third distance≤1 mm;
• a maximum distance between any point on the light emergent surface and the substrate is a fourth distance, the fourth distance≤6.5 mm.