Display element and method of manufacturing display element

Abstract

A display element includes a light emitting unit that supplies light; and an angle converting unit including a reflection surface, an output surface, and a flat surface. The angle converting unit converts an angle of the light by reflecting the light toward the output surface. The light emitting unit is arranged in a matrix in two directions substantially perpendicular each other on a standard plane. An inequality 0≦t<p(p−d−f)(tan θa)/(p+d−f) is satisfied, where t is a distance between the flat surface and the output surface, p is a pitch of the light emitting unit arranged in a predetermined direction, d is a length of the light emitting unit, f is a length of the flat surface, and θa is an angle between the reflection surface and the standard plane.

1 . A display element comprising: 
 a light emitting unit that is provided on a standard plane, and supplies light; and    an angle converting unit including 
 a reflection surface that is provided on a periphery of the light emitting unit, and reflects the light from the light emitting unit;  
 an output surface that outputs the light from the light emitting unit and the reflection surface; and  
 a flat surface that is provided between the reflection surfaces in parallel with the output surface, wherein  
   the angle converting unit converts an angle of the light by reflecting the light incident on the reflection surface from the light emitting unit toward the output surface,    the light emitting unit is arranged in a matrix in two directions substantially perpendicular each other on the standard plane, and    a geometrical shape of the angle converting unit satisfies following inequality      0 ≦t<p ( p−d−f )(tan θ a )/( p+d−f )    where t is a distance between the flat surface and the output surface, p is a pitch at which the light emitting unit is arranged in a predetermined direction, d is a length of the light emitting unit in the predetermined direction, f is a length of the flat surface in the predetermined direction, and θa is an angle between the reflection surface and the standard plane.    
   
   
       2 . The display element according to  claim 1 , wherein the geometrical shape of the angle converting unit further satisfies following inequality  
       0 ≦t<p ( p−d−f )(tan θ a )/2( p+d−f ).  
   
   
       3 . The display element according to  claim 1 , wherein the reflection surface has a longitudinal direction in at least one of the two directions substantially perpendicular each other on the standard plane.  
   
   
       4 . A method of manufacturing a display element that includes a light emitting unit that is provided on a standard plane, and supplies light; and an angle converting unit including a reflection surface that is provided on a periphery of the light emitting unit, and reflects the light from the light emitting unit, an output surface that outputs the light from the light emitting unit and the reflection surface, and a flat surface that is provided between the reflection surfaces in parallel with the output surface, the method comprising: 
 bonding temporarily a holding substrate to a surface of a parallel plate;    forming the reflection surface at a predetermined distance from a surface on which the holding substrate is temporarily bonded by pressing a mold having the predetermined pattern to other surface of the parallel plate opposite to the surface on which the holding substrate is temporarily bonded;    bonding the surface of the parallel plate on which the reflection surface is formed and a substrate on which the light emitting unit is arranged in advance; and    peeling the holding substrate temporarily bonded from the parallel plate.    
   
   
       5 . A display element comprising: 
 a light emitting unit that is provided on a standard plane, and supplies light; and    an angle converting unit that includes a reflection surface provided on a periphery of the light emitting unit, and converts an angle of the light by reflecting the light incident on the reflection surface from the light emitting unit toward an output surface, wherein    a geometrical shape of the angle converting unit satisfies following inequality      { a  sin(1 /n )}/2+π/4 <θb<π/ 2    where θb is an angle in radian between the reflecting surface and the standard plane, and n is refractive index of a material of which the angle converting unit is made.    
   
   
       6 . The display element according to  claim 5 , wherein 
 the light emitting unit is arranged in a matrix in two directions substantially perpendicular each other on the standard plane, and    the reflection surface has a longitudinal direction in at least one of the two directions.    
   
   
       7 . The display element according to  claim 5 , wherein 
 the light emitting unit is arranged in a matrix in two directions substantially perpendicular each other on the standard plane, and    the angle converting unit includes 
 a first reflection surface having a longitudinal direction in a first direction from among the two directions; and  
 a second reflection surface having a longitudinal direction in a second direction from among the two directions.  
   
   
   
       8 . The display device according to  claim 5 , wherein the light emitting unit includes a low reflection portion at which a reflectivity of light incident to the light emitting unit from the output surface is equal to or less than a predetermined value.  
   
   
       9 . The display device according to  claim 5 , further comprising a polarizing plate that transmits only a polarized light in a specific oscillation direction on the output surface of the angle converting unit.  
   
   
       10 . The display device according to  claim 7 , wherein a structure formed with the first reflection surface and a structure formed with the second reflection surface have substantially same height in a direction normal to the standard plane.  
   
   
       11 . The display device according to  claim 5 , wherein the angle converting unit further includes a light absorbing portion that absorbs light at a position on the reflection surface on a side of the output surface.