Mechanoluminescent display device

1. A mechanoluminescent display device, comprising:

a substrate having a predetermined shape; and

projections formed with a predetermined pattern on the substrate,

wherein the projections are formed of a mixture of a stress luminescent material emitting light by mechanical energy which is applied from outside and a stress transmission material transmitting the mechanical energy applied from the outside to the stress luminescent material; and

wherein the stress transmission material is a polydimethylsiloxan or a silicon rubber,

wherein the pattern comprises a first area and a second area,

wherein projections included in the first area include a first stress luminescent material, and projections included in the second area include a second stress luminescent material, said second stress luminescent material being different from the first stress luminescent material, and

wherein the first stress luminescent material and the second stress luminescent material have light emitting spectrums different from each other.

2. The mechanoluminescent display device of claim 1 , wherein at least one characteristic selected from the group consisting of an optical spectrum, brightness, and a color coordinate, of each of the first stress luminescent material and the second stress luminescent material varies in accordance with a change in a period of transmitting the mechanical energy applied to the first stress luminescent material and the second stress luminescent material.

3. The mechanoluminescent display device of claim 1 , wherein the second stress luminescent material emits white light as the mechanical energy is applied, and a mixing ratio of red and blue phosphors in the second stress luminescent material is at least one of 9:1, 8:2, 7:3, 6:4, and 5:5.

4. The mechanoluminescent display device of claim 1 , wherein the mechanical energy is wind or vibration.