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US 2003/0117595 A1Published application
Image projection device with an integrated photodiode light source
AssigneeDelta Electronics, Inc.
InventorsHsiao Yi Li, Hung Lung Cheng, He Chiang Liu
Life of this patent
Estimating the term…
Abstract
A power-saving method with integrated photodiode light source. This device has a circuit board with a plurality of red, green and blue photodiodes as the device's light source. Additionally, a light control circuit is used to control light beam from the light source illuminating a reflector and then reflecting to a reflective display panel in order to reflect the light beam and generate an image. Thus, a projection module can project the image on a viewing plate. As cited, the inventive device includes: a light control circuit, a light source module, a polarizing beam splitter (PBS), a reflective display panel and a projection module.
Claims28
An image projection device with integrated photodiode light source, comprising:
- a light source module, which further comprises:
- at least one pair of semiconductor photodiode arrays to respectively illuminate a first unpolarized light beam and a second unpolarized light beam, wherein semiconductor photodiode is an LED,
- a prism to fully reflect the first unpolarized light beam and conduct the second unpolarized light beam in a specific incidence such that the first and second unpolarized beams are propagated in the same direction, and
- a polarizer to convert the first and second unpolarized beams into a first polarized light beam;
- a first polarizing beam splitter, implemented on one side of the polarizer, to reflect the first polarized light beam;
- a reflective display panel to receive the first polarized light beam reflected by the first polarizing beam splitter and convert the received first polarized light beam into a second polarized light beam;
- and
- a projection module to project the second polarized light beam.
5 more elements
An image projection device with integrated photodiode light source, comprising:
- a light source module, which further comprises:
- a semiconductor photodiode array to illuminate an unpolarized light beam, wherein the semiconductor photodiode array is an LED array,
- a second polarizing beam splitter to split the unpolarized light beam as a first polarized light beam and a second polarized light beam,
- a wave-retardation plate to convert the second polarized light beam into another first polarized light beam, and
- a reflector to reflect the other first polarized light beam such that the first polarized light beams are propagated in the same direction;
- a first polarizing beam splitter to reflect the first polarized light beams;
- a reflective display panel to receive the first polarized light beams reflected by the first polarizing beam splitter and convert the received first polarized light beams into a second polarized light beam;
- and
- a projection module to project the second polarized light beam.
6 more elements
An image projection device with integrated photodiode light source, comprising:
- a light source module, which further comprises:
- a first semiconductor photo diode array to illuminate a first unpolarized light beam, wherein the first semiconductor photodiode array is an LED array,
- a second semiconductor photodiode array to illuminate a second unpolarized light beam, wherein the second semiconductor photodiode array is an LED array,
- a second polarizing beam splitter to respectively convert the first unpolarized light beam and the second unpolarized light beam into first and second polarized light beams and then reflect each of the first and second polarized light beams, and
- a reflector to reflect the first polarized light beam of the second semiconductor photodiode array such that the first polarized light beams are propagated in the same direction;
- a first polarizing beam splitter to reflect the first polarized light beams;
- a reflective display panel to receive the first polarized light beams reflected by the first polarizing beam splitter and convert the received first polarized light beams into a second polarized light beam;
- and
- a projection module to project the second polarized light beam.
6 more elements
An image projection device with integrated photodiode light source, comprising:
- a light source module having at least one illuminating unit, a second polarizing beam splitter and at least one reflector,
- wherein the at least one illuminating unit has a plurality of three primary color LEDs on a circuit board as three primary color groups, the second polarizing beam splitter splits light beams from the at least one illuminating unit as a first polarized light beam and a second polarized light beam and reflects the first polarized light beam to the reflector, and the reflector receives the first polarized light beam;
- a light control circuit having:
- at least one discontinuous pulse generator to generate three sets of pulses electrically connected to the groups one-to-one, and
- three driving circuits respectively connected between the pulse generator and the groups, having a common input terminal to receive the pulses generated by the pulse generator and three separate output terminal to drive the respectively connected groups to illuminate light beams in turn;
- a first polarizing beam splitter to receive the first polarized light beam reflected by the reflector;
- a reflective display panel to receive the first polarized light beam reflected by, the first polarizing beam splitter and convert the received first polarized light beam into a second polarized light beam;
- and
- a projection module to project the second polarized light beam.
6 more elements
An image projection device with integrated photodiode light source, comprising:
- a light source module having at least one illuminating unit, a second polarizing beam splitter and at least one reflector,
- wherein the at least one illuminating unit has a plurality of three primary color photodiodes on a circuit board as three primary color groups, the second polarizing beam splitter splits light beams from the at least one illuminating unit as a first polarized light beam and a second polarized light beam and reflects the first polarized light beam to the reflector, and the reflector receives the first polarized light beam;
- a light control circuit having:
- a three primary field-sequential color microdisplay having three output terminals to output three differently discontinuous pulses, respectively,
- three switch circuits having three input terminals connected to the outputs of the microdisplay one-to-one to receive the discontinuous pulses and three output terminals connected to one side of the three groups one-to-one, and
- three DC supply circuits respectively connected to the other side of the three groups one-to-one to supply an operating voltage to the groups and the microdisplay;
- a first polarizing beam splitter to receive the first polarized light beam reflected by the reflector;
- a reflective display panel to receive the first polarized light beam reflected by the first polarizing beam splitter and convert the received first polarized light beam into a second polarized light beam;
- and
- a projection module to project the second polarized light beam.
7 more elements
An image projection device with integrated photodiode light source, comprising:
- a light source module having at least one illuminating unit and at least one reflector, wherein the at least one illuminating unit has a plurality of RGB photodiodes on a circuit board as RGB groups, and the reflector receives light beams illuminated by the groups;
- a light control circuit having:
- at least one discontinuous pulse generator to generate three sets of pulses electrically connected to the groups one-to-one, and
- three driving circuits respectively connected between the pulse generator and the groups, having a common input terminal to receive the pulses generated by the pulse generator and three separate output terminal to drive the respectively connected groups to illuminate light beams in turn;
- a first polarizing beam splitter to receive light beams reflected by the reflector;
- and
- a reflective display panel to receive light beams reflected by the first polarizing beam splitter as a first polarized light beam and convert the first polarized light beam into a polarized image light beam.
4 more elements
Dependencies are inferred from the claim text.