Plane light source unit and method for manufacturing holographic light-guide used for the same
OwnerKeun-Chang Yanginventor
Life of this patent
Estimating the term…
Abstract
A plane light source unit for backlighting and a method for manufacturing holographic light-guides used for the same is disclosed. The holographic light-guide has a first holographic layer on the bottom surface. The first holographic layer has patterns formed with a plurality of holograms, the area density of the pattern being low toward the tubular light source and increasing with an increase in distance from the tubular light source, thereby uniformly illuminating the LCD panel. The holographic light-guide also has a second holographic layer on the top surface, the second holographic layer adjusting scattering pattern of the beam emerged from the light-guide plate.
Claims33
A plane light source unit for a flat panel display, comprising:
- at least one tubular light source, elongated in a direction;
- a holographic light-guide having at least one light incident surface placed near the tubular light source, a reflecting surface on which a first holographic layer is formed for uniform illumination, and a light emitting surface;
- and
- a reflector disposed against the reflecting surface of the holographic light-guide, for reflecting the light that emerges from the reflecting surface and redirecting the light to the reflecting surface,
- wherein the first holographic layer has patterns with a plurality of holograms formed therein, the area density of the patterns being low toward the tubular light source and increasing with an increase in distance from the tubular light source.
A plane light source unit for flat panel display, comprising:
- a plurality of tubular light sources disposed in parallel, elongated in a direction;
- a holographic light-guide having a light incident surface placed against the tubular light sources and a light emitting surface opposite to the light incident surface, a first holographic layer being formed on one surface selected from the group consisting of the light incident surface and the light emitting surface;
- and
- a reflector disposed against both the tubular light sources and the reflecting surface of the holographic light-guide, for reflecting and redirecting the light to the reflecting surface,
- wherein the first holographic layer has speckles, the density of the speckles being dense near the tubular light sources and sparse away the tubular light source.
In a plane light source unit for flat panel display including a holographic light-guide, the holographic light-guide having a reflecting surface on which a first holographic layer is formed, and a light emitting surface on which a second holographic layer is formed, a method for manufacturing the holographic light-guide comprising the steps of:
- 1) forming a first hologram for the first holographic layer, comprising the steps of:
- A) enlarging a laser beam and entering it into a diffuser;
- B) exposing a first substrate with a mask having patterns to be formed upon the first substrate, the first substrate being coated with photoresist;
- and
- C) developing the first substrate by etching the photoresist;
- 2) forming a second hologram for the second holographic layer, comprising the steps of:
- a) enlarging a laser beam and entering it into a cylindrical lens so that the laser beam enters a diffuser;
- b) exposing a portion of a second substrate with a shielding plate to the laser beam at a predetermined distance, the second substrate being coated with photoresist;
- c) repeating the step b) as the distance increases by a predetermined increment until the entire surface of the second substrate is exposed, wherein the portion to be exposed is adjacent to the portion previously exposed and the portion exposed is shielded by the shielding plate;
- and
- d) developing the second substrate by etching the photoresist;
- 3) forming a first metal stamper by electroless-plating the first substrate;
- 4) forming a second metal stamper by electroless-plating the second substrate;
- 5) coating a transparent plate with an ultraviolet-curing material;
- 6) irradiating the coated transparent plate with ultraviolet rays without completely curing the ultraviolet-curing material;
- 7) pressing the irradiated transparent plate up and down with the first metal stamper and the second metal stamper simultaneously;
- and
- 8) irradiating the transparent plate with ultraviolet rays until the ultraviolet-curing material is completely cured.
In a plane light source unit for flat panel display including a holographic light-guide, the holographic light-guide having a reflecting surface on which a first holographic layer is formed, and a light emitting surface on which a second holographic layer is formed, a method for manufacturing the holographic light-guide comprising the steps of:
- 1) forming a first hologram for the first holographic layer, comprising the steps of:
- A) enlarging a laser beam and entering it into a diffuser;
- B) exposing a first substrate with a mask having patterns to be formed to the laser beam, the first substrate being coated with photoresist;
- and
- 2) forming a second hologram for the second holographic layer, comprising the steps of:
- a) enlarging a laser beam and entering it into a cylindrical lens so that the laser beam enters a diffuser;
- b) exposing a portion of a second substrate with a shielding plate to the laser beam at a predetermined distance, the second substrate being coated with photoresist;
- c) repeating the step b) as the distance increases by a predetermined increment until the entire surface of the second substrate is exposed, wherein the portion to be exposed is adjacent to the portion previously exposed and the portion exposed is shielded by the shielding plate;
- and
- d) developing the second substrate by etching the photoresist;
- 3) forming a first metal stamper by electroless-plating the first substrate;
- 4) forming a second metal stamper by electroless-plating the-second substrate;
- 5) providing a mold with the first metal stamper and second metal stamper attached to the bottom and top thereof, respectively;
- and
- 6) injecting molding material into the mold.
In a plane light source unit for a flat panel display including a holographic light-guide, the holographic light-guide having a holographic layer on one of the top and bottom surfaces, a method for manufacturing the holographic light-guide comprising the steps of:
- 1) enlarging a laser beam and entering it into a diffuser;
- 2) exposing a portion of a substrate with a shielding plate to the laser beam at a predetermined distance, the second substrate being coated with photoresist;
- 3) repeating the step 2) as the distance increases by a predetermined increment until the entire surface of the substrate is exposed, wherein the portion to be exposed is adjacent to the portion previously exposed and the portion previously exposed is shielded by the shielding plate;
- 4) developing the substrate by etching the photoresist;
- 5) forming a metal stamper by electroless-plating the substrate;
- 6) coating a transparent plate with an ultraviolet-curing material;
- 7) irradiating the coated transparent plate by ultraviolet rays without completely curing the ultraviolet-curing material;
- 8) pressing the irradiated transparent plate with the metal stamper;
- and
- 9) irradiating the transparent plate by ultraviolet rays until the ultraviolet-curing material is complete cured.
In a plane light source unit for a flat panel display including a holographic light-guide, the holographic light-guide having a holographic layer on one of the top and bottom surfaces, a method for manufacturing the holographic light-guide comprising the steps of:
- 1) enlarging, a laser beam and entering it into a diffuser;
- 2) exposing a portion of a substrate with a shielding plate to the laser beam at a predetermined distance, the second substrate being coated with photoresist;
- 3) repeating the step 2) as the distance increases by a predetermined increment until the entire surface of the substrate is exposed, wherein the portion to be exposed is adjacent to the portion previously exposed and the portion previously exposed is shielded by the shielding plate;
- 4) developing the substrate by etching the photoresist;
- 5) forming a metal stamper by electroless-plating the substrate;
- 6) providing a mold with the metal stamper attached;
- and
- 7) injecting molding material into the mold.
In a plane light source unit for flat panel display including a holographic light-guide, the holographic light-guide having a reflecting surface on which a first holographic layer is formed, and a light emitting surface on which a second holographic layer is formed, the first holographic layer being formed in a speckled pattern which is densely formed at portions near a light source and sparsely formed at portions remote from the light source, the second holographic layer being formed in a speckle pattern which is uniformly formed over an entire surface, a method for manufacturing the holographic light-guide comprising the steps of:
- 1) forming a first hologram for the first holographic layer, comprising the steps of:
- A) enlarging a laser beam and entering it into a diffuser;
- B) exposing a portion of a first substrate with a shielding plate to the laser beam at a predetermined distance, the first substrate being coated with photoresist;
- C) repeating the step B) as the distance increases by a predetermined increment until the entire surface of the first substrate is exposed, wherein the portion to be exposed is adjacent to the portion previously exposed and the portion previously exposed is shielded by the shielding plate;
- and
- D) developing the first substrate by etching the photoresist;
- 2) forming a second hologram for the second holographic layer, comprising the steps of:
- a) enlarging a laser beam and entering it into a diffuser;
- b) exposing a portion of a second substrate by etching the photoresist;
- 3) forming a first metal stamper by electroless-plating the first substrate;
- 4) forming a second metal stamper by electroless-plating the second substrate;
- 5) coating a transparent plate with an ultraviolet-curing material;
- 6) irradiating the coated transparent plate by ultraviolet rays without complete curing the ultraviolet-curing material;
- 7) pressing the irradiated transparent plate up and down with the first metal stamper and the second metal stamper simultaneously;
- and
- 8) irradiating the transparent plate with ultraviolet rays until the ultraviolet-curing material is completely cured.
In a plane light source unit for flat panel display including a holographic light-guide, the holographic light-guide having a reflecting surface on which a first holographic layer is formed, and a light emitting surface on which a second holographic layer is formed, the first holographic layer being formed in a speckled pattern which is densely formed at portions near a light source and sparsely formed at portions remote from the light source, the second holographic layer being form in a speckle pattern which is uniformly formed over an entire surface, a method for manufacturing the holographic light-guide comprising the steps of:
- 1) forming a first hologram for the first holographic layer, comprising the steps of:
- A) enlarging a laser beam and entering it into a diffuser;
- B) exposing a portion of a first substrate with a shielding plate to the laser beam at a predetermined distance, the first substrate being coated with photoresist;
- C) repeating the step B) as the distance increases by a predetermined increment until the entire surface of the first substrate is exposed, wherein the portion to be exposed is adjacent to the portion previously exposed and the portion previously exposed is shielded by the shielding plate;
- and
- D) developing the first substrate by etching the photoresist;
- 2) forming a second hologram for the second holographic layer, comprising the steps of:
- a) enlarging a laser beam and entering it into a diffuser;
- b) exposing a portion of a second substrate by etching the photoresist;
- 3) forming a first metal stamper by electroless-plating the first substrate;
- 4) forming a second metal stamper by electroless-plating the second substrate;
- 5) providing a mold with the first metal stamper and second meta stamper attached to the bottom and top thereof, respectively;
- and
- 6) injecting molding material into the mold.
Dependencies are inferred from the claim text.