Toshiba TLP-711U 기술 교육 매뉴얼 - 페이지 5

{카테고리_이름} Toshiba TLP-711U에 대한 기술 교육 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Toshiba TLP-711U 31 페이지. 3 lcd data projector
Toshiba TLP-711U에 대해서도 마찬가지입니다: 소유자 매뉴얼 (48 페이지), 서비스 매뉴얼 (30 페이지)

페이지 인쇄

2 . O P T I C A L S Y S T E M

2-1. Configuration

No.

N a m e

UHP lamp

L a m p

u n i t

Parabolic

reflector

Multi-lenses

A, B

Multi-PBS

(Polarizing

beam splitter)

Retardation

f i l m

Condenser

lens

Full reflection

mirror

Mirror

box

u n i t

Dichroic

mirror

Field lens

Relay lens

Incident side

polarized

plate/Phase

difference

plate

Liquid crystal

panel

Prism

u n i t

Dichroic

prism

Projec-

Projection

t i o n

lens

Light source of the optical system. AC lighting system 120W, arc length 1.3 mm.

As the arc length is shorter than the conventional metal halide lamp, the light source

operates as an ideal light point source and this improves the light convergence factor.

Also, the color temperature gets higher and this allows to reproduce more natural

white color.

Parabolic reflector converges light emitted from the UHP lamp forward in approximate

parallel light beams and illuminates the liquid crystal panel.

Two multi-lenses A and B allow a circular beam light emitted from the light source to

illuminate the square liquid crystal panel evenly, thus providing projected pictures

with less brightness variation. Multi-lens A is coated with UV-IR which passes the

necessary visible rays of the radiation light from UHP lamp and cuts unnecessary

ultraviolet rays and infrared rays.

Separates the illuminating light from the light source via multi-lens B into P polariza-

tion light and S polarization light.

Converts P polarization light into S polarization light among P and S polarization

lights separated by multi-PBS.

Converges the illuminating light emitted from the light source into the liquid crystal

panel.

Reflection mirror to refract light axis.

Separates the white light emitted from the light source into RGB three primary colors.

The white light emitted from the light source reflects B light using a dichroic mirror 1

and the RG lights pass through the dichroic mirror 1. Of the RG lights passed, G light

is reflected by the dichroic mirror 2 and R light passes.

Light transmitted through liquid crystal panel is converged in direction of focal point

and effectively entered entrance pupil of the projection lens. Also, R and G field lens

possess dichroic filter characteristics to improve color purity.

In the B axis optical path which is longer than those of R, G, the relay lens works as

a correction lens to arrange the illumination distribution of the liquid crystal panel

surface with that of other liquid crystal panel.

The illumination lights separated into RGB change the S polarization light component

in processing the PBS and phase difference plate operation previously described.

The incident side polarized plate arranges the illumination light more effective direct

polarization light. The phase difference plate used works to converge the S polariza-

tion light into the polarization light which fits to the transparent axis of the liquid

crystal panel.

These polarizing plates and difference plates are constructed in one plate by

attaching each other, and put on a glass plate.

Light exit side polarized plate is put on the light exit plane. When no signal voltage is

applied, the polarization direction of transmission light rotates by 90 degrees. When a

voltage is applied, the polarization direction is controlled owing to the voltage

applied. That is, the liquid crystal panel employs such general TN type liquid crystal.

In this model, the incidence/exit polarization plate is placed (in normally white mode)

so that the light transmission amount becomes maximum (white) when no voltage is

added and the light transmission amount becomes minimum (black) when maximum

voltage is added. The phase difference plate is pasted on the polarized plate. The

light passed through G panel is developed as P polarization light and each light

passing through R and B panel is developed as S polarization light.

Furthermore, microlens array is attached on the incident light side of LCD panel.

Conventionally, the incident light blocked by TFT portions is focused by the microlens

array to improve light usability and to increase the effective aperture of the LCD panel.

Works to mix RGB lights passed through the liquid crystal panel and forms color

picture image.

Demodulated by the video signal on the liquid crystal panel and projects pictures

with video light mixed by dichroic prism at a screen enlargely. Light axis of the

projection lens is set at upper side of center of the liquid crystal panel and this

realizes easy viewing of the panel because the projected screen position is upper

than the unit position. (The lower side of the projected screen positions at the center

axis of projection lens.)

The projection lens employs the zoom & focus system and allows to project enlarging

a picture upto maximum approx. 300 inch.

2-1

Description