# US 2021/0240060 A1 · Reflector and optical system of LCD projector

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- Number: US 2021/0240060 A1
- Document ID: US20210240060A1
- Status: Published application
- Kind: A1
- Application number: 17/238,225
- Filed: 2021-04-23
- Published: 2021-08-05
- Earliest claimed: 2021-03-08
- Assignees: Nanhua Intelligent Precision Machine (Shenzhen) Co., Ltd.
- Applicants: Nanhua Intelligent Precision Machine (Shenzhen) Co., Ltd.
- Inventors: Hanwen Guo
- Web page: https://patentgrep.com/patent/US20210240060A1

## CPC

- G03B 21/006: {using LCD's}
- H04N 9/3144: {Cooling systems (cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16)}
- G02F 1/13362: {providing polarized light, e.g. by converting a polarisation component into another one}
- G02F 1/133627: {Projection-direct viewing}
- G03B 21/16: Cooling; Preventing overheating
- G03B 21/2033: {LED or laser light sources}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)}
- H04N 9/3105: {for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators (simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10)}
- H04N 9/3167: {for polarizing the light beam (polarizing optical systems per se G02B27/28)}
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A reflector includes a reflective film and a substrate, wherein the reflective film is attached to the substrate. Also, an optical system of an LCD (liquid crystal display) projector includes a first reflector, a second reflector, an LED (light emitting diode) light source, a condenser, a collimating lens, an LCD light valve, a field lens and a projection lens, wherein the LED light source, the condenser, the first reflector, the collimating lens, the LCD light valve, the field lens, the second reflector and the projection lens are set in sequence according to a direction of light. The reflector is significantly improved in the reflection efficiency while maintaining the low cost, or the reflector is significantly reduced in the manufacturing cost while achieving the high reflection efficiency, so that the output brightness and the photoelectric efficiency of the projector including the reflector with low cost, which has a very positive effect.

## Claims

### Claim 1

A reflector, which comprises a reflective film and a substrate, wherein the reflective film is attached to the substrate.

### Claim 2 (depends on 1)

The reflector according to claim 1, wherein the reflective film is one of an ESR (enhanced specular reflector) reflective film of 3M Company, a DBEF (dual brightness enhancement film) reflective film of 3M Company, and a ReflecTech reflective film of SkyFuel Company.

### Claim 3 (depends on 1)

The reflector according to claim 1, the substrate is one of a flat glass plate, a metal plate, a plastic plate and a ceramic plate.

### Claim 4

An optical system of an LCD (liquid crystal display) projector, wherein the optical system comprises a first reflector (3), a second reflector (7), an LED (light emitting diode) light source (1), a condenser (2), a collimating lens (4), an LCD light valve (5), a field lens (6) and a projection lens (8), wherein the LED light source (1), the condenser (2), the first reflector (3), the collimating lens (4), the LCD light valve (5), the field lens (6), the second reflector (7) and the projection lens (8) are set in sequence according to a direction of light, wherein the first reflector (3) comprises a first reflective film (31) and a first substrate (32), the second reflector (7) comprises a second reflective film (71) and a second substrate (72), the first reflective film (31) is attached to the first substrate (32), the second reflective film (71) is attached to the second substrate (72).

### Claim 5 (depends on 4)

The optical system according to claim 4, further comprising a first thermal diffusion structure (9) which is provided at a shady face (321) of the first substrate (32) of the first reflector (3) and a second thermal diffusion structure (10) which is provided at a shady face (721) of the second substrate (72) of the second reflector (7).

### Claim 6 (depends on 4)

The optical system according to claim 4, wherein each of the first reflective film (31) and the second reflective film (71) is one of an ESR (enhanced specular reflector) reflective film of 3M Company, a DBEF (dual brightness enhancement film) reflective film of 3M Company, and a ReflecTech reflective film of SkyFuel Company.

### Claim 7 (depends on 5)

The optical system according to claim 5, wherein each of the first reflective film (31) and the second reflective film (71) is one of an ESR (enhanced specular reflector) reflective film of 3M Company, a DBEF (dual brightness enhancement film) reflective film of 3M Company, and a ReflecTech reflective film of SkyFuel Company.

### Claim 8 (depends on 4)

The optical system according to claim 4, wherein each of the first substrate (32) and the second substrate (72) is one of a flat glass plate, a metal plate, a plastic plate and a ceramic plate.

### Claim 9 (depends on 5)

The optical system according to claim 5, wherein each of the first substrate (32) and the second substrate (72) is one of a flat glass plate, a metal plate, a plastic plate and a ceramic plate.

### Claim 10 (depends on 6)

The optical system according to claim 6, wherein each of the first substrate (32) and the second substrate (72) is one of a flat glass plate, a metal plate, a plastic plate and a ceramic plate.

### Claim 11 (depends on 7)

The optical system according to claim 7, wherein each of the first substrate (32) and the second substrate (72) is one of a flat glass plate, a metal plate, a plastic plate and a ceramic plate.