Organic electroluminescent display device with improved image clarity and light emitting efficiency
An organic electroluminescent (EL) display device is provided which includes a film with a multi-dimensional grating pattern formed on a surface thereof. The display device includes a transparent substrate, a first electrode formed on the transparent substrate, an organic light emitting layer formed on the first electrode, a second electrode formed on the organic light emitting layer. The is provided at a bottom of the transparent substrate. A display device employing this film with a multi-dimensional grating pattern provides improved light emitting efficiency and enhanced image quality.
1. An electroluminescent display device, comprising:
a transparent substrate;
a first electrode formed on the transparent substrate;
a light-emitting layer formed on the first electrode;
a second electrode formed on the light-emitting layer; and
a film having a grating pattern, the grating pattern comprising a plurality of grating components formed on a surface thereof, wherein each grating component of the grating pattern extends in the X, Y and Z dimensions, wherein the plurality of grating components comprises a plurality of projections arranged in a matrix form which each extend outward from a base portion of the film, and wherein each interval between adjacent projections of the plurality of projections is less than or equal to approximately half of a corresponding reflective light wavelength.
2. The device of claim 1 , wherein each interval between adjacent projections is less than approximately 200 nm.
3. The device of claim 1 , wherein the base portion of the film is provided on a bottom surface of the transparent substrate, and the light-emitting layer is provided on a top surface of the transparent substrate.
4. The device of claim 1 , wherein each of the plurality of projections is formed in one of a polyhedral, semi-spherical, and circular form.
5. The device of claim 4 , wherein each of the plurality of projections comprises a hexahedral form which extends from a base portion of the film.
6. The device of claim 1 , wherein the film comprises a macromolecular material configured to intensify heat or ultraviolet rays, and wherein the film has a light transmissivity of greater than approximately 85%.
7. The device of claim 1 , the film having with a grating pattern formed on a surface thereof comprises two different materials, each material having a different refractive index.