Light-emitting element unit and display device

Abstract

A light-emitting element unit which can improve color purity of light emitted from a color filter is provided. A display device with high color purity and high color reproducibility is provided. The light-emitting element unit includes a wiring board, a light-emitting element chip provided over the wiring board, a micro optical resonator provided over the wiring board and at the periphery of the light-emitting element chip, and a phosphor layer covering the light-emitting element chip and the micro optical resonator. The display device includes a display panel having a coloring layer and a backlight module having the light-emitting element unit. Examples of the display panel include: a liquid crystal panel; and a display panel including an opening portion provided over a first substrate, MEMS moving over the opening portion in the lateral direction, and a second substrate provided with a coloring layer in a portion corresponding to the opening portion.

What is claimed is: 
     
         1 . A display device comprising:
 a first substrate;   a second substrate opposite to the first substrate;
 a first reflective layer provided over the first substrate, the first reflective layer including an opening portion; 
   a microstructure provided over the first reflective layer corresponding to the opening portion, the microstructure including a shutter;   a transistor connected to the microstructure;   a coloring layer provided on the second substrate facing to the opening portion; and   a backlight module,   wherein the backlight module comprises a light-emitting element unit, the light-emitting element unit comprising:
 a wiring board; 
 a light-emitting element chip provided over the wiring board; 
 a micro optical resonator provided at a periphery of the light-emitting element chip; and
 a phosphor layer at least covering the light-emitting element chip, and 
 
   wherein the microstructure is a movable structure.   
     
     
         2 . The display device according to  claim 1 ,
 wherein the microstructure comprises a first movable electrode connected to one side of the shutter, a second movable electrode provided near the first movable electrode, and a spring connected to the other side of the shutter.   
     
     
         3 . The display device according to  claim 2 ,
 wherein the first movable electrode and the spring are electrically connected to a common electrode or a ground electrode, and   wherein the second movable electrode is electrically connected to the transistor.   
     
     
         4 . The display device according to  claim 1 , wherein the microstructure moves in a direction parallel to a surface of the first substrate. 
     
     
         5 . The display device according to  claim 1 , wherein the micro optical resonator comprises a second reflective layer, a semi-transmissive semi-reflective layer facing the second reflective layer, and a light-transmitting layer provided between the second reflective layer and the semi-transmissive semi-reflective layer. 
     
     
         6 . The display device according to  claim 5 , wherein a light path length L between the second reflective layer and the semi-transmissive semi-reflective layer is represented by a formula, L=(2m+1)λ/4n, and
 wherein in the formula, the m indicates an integer, the λ indicates a wavelength, and the n indicates a refractive index of the light-transmitting layer. 
 
     
     
         7 . The display device according to  claim 6 , wherein the λ is 430 nm to 490 nm. 
     
     
         8 . The display device according to  claim 6 , wherein the λ is 490 nm to 550 nm. 
     
     
         9 . The display device according to  claim 6 , wherein the λ is 550 nm to 590 nm. 
     
     
         10 . The display device according to  claim 6 , wherein the λ is 640 nm to 770 nm. 
     
     
         11 . The display device according to  claim 5 , wherein the light-transmitting layer comprises a plurality of layers which are stacked. 
     
     
         12 . The display device according to  claim 1 , wherein the phosphor layer covers the micro optical resonator. 
     
     
         13 . The display device according to  claim 1 , further comprising an organic resin layer covering the phosphor layer, wherein the organic resin layer transmits a light, and wherein a shape of the organic resin layer is a convex shape.