KR100249226B1 - Lcd projector lighting apparatus - Google Patents

Abstract

The present invention improves color performance without losing light by adjusting the amount of light by color to a spectrum that is helpful for color reproduction of a projector different from the light spectrum from an illumination lamp by using the light absorption / light emission characteristic of an organic die. It is to provide a lighting device for an LCD projector.

According to a feature of the present invention, an LCD projector illumination device is provided by placing a medium containing an organic die after the LCD lighting lamp, so that the LCD light is absorbed by the light absorption and light emission characteristics of the die when the lamp light source passes through the organic die. Unlike the light spectrum from the lamp, you get a helpful spectrum of color reproduction in the LCD projector.

Description

Lighting equipment for LCD projectors

The present invention relates to a lighting device for an LCD projector, and more particularly, to an LCD projector that improves color performance by controlling light quantity for each color while reducing light loss by using light absorption and light emission characteristics of an organic die. It relates to a lighting device.

In a conventional lighting device for an LCD projector, the color is almost determined by the spectral distribution of the lighting lamp. Of course, it can be changed by a dichroic mirror or a filter, but this change is accompanied by a loss of light.

For example, in order to harmonize blue and other colors that are insufficient in light, a method of reducing red or green light is generally used. You see.

Therefore, in the conventional LCD projector lighting device, the color determination is not satisfactory because the color determination should be based on the spectral distribution of the illumination lamp, and the amount of light when a dichroic mirror or a filter is used to satisfactorily perform the color reproduction. There was a problem that the loss of.

The present invention has been invented in view of the above-mentioned problems of the prior art, and by using the light absorption / light emission characteristics of the organic die, different colors are used for the color spectrum of the projector, which is different from the light spectrum from the lighting lamp. It is to provide a lighting device for an LCD projector that adjusts the amount of light to improve the color implementation performance without loss of light.

1 is a view schematically showing an energy band of an organic die;

2 is a graph schematically illustrating light energy absorption and emission of an organic die;

3 to 5 show an embodiment of the present invention.

Explanation of symbols for main parts of the drawings

10: illumination light source 11, 11 ': spectrum converter

12, 12 ': transparent cell 13: organic die

14, 15: lens assembly 16: rotation axis

17: motor 18: gear

19: cell support

According to a feature of the present invention for achieving the above object, the illumination device for the LCD projector has a medium containing the organic die after the LCD lighting lamp, so that when the lamp light source passes through the organic die, Due to the light emission characteristics, it is possible to obtain a helpful spectrum of color reproduction of the LCD projector, which is different from the light spectrum from the LCD lighting lamp.

The present invention having such characteristics utilizes the characteristics of an organic die which forms a wide variety of energy bands depending on the type and the dissolving solvent.

That is, as shown in FIG. 1, when light having _a specific absorption wavelength band λ _a is incident on the organic die, the organic die absorbs the light and, from the ground state, S ₁ , S _2, etc. Transition to an allowable energy level of molecular levels (m ₁₁ -m ₁₅ ... M ₂₁ -m ₂₅ ...).

In the case of organic die, since most of the molecular levels (m ₁₁ -m ₁₅ ..., m ₂₁ -m ₂₅ ...) exist near the energy bands such as S ₁ and S ₂ , the absorbed wavelength has a constant band. do.

On the other hand, each molecular level _{(m 11 -m 15 ..., m} 21 -m 25 ...) of the transition state in Organic die is in S _1, the peak is very short molecular level "0" state during the second state S ₂ Are collected by transitioning to the back, and the energy difference between the molecular level (m ₁₁ -m ₁₅ …, m ₂₁ -m ₂₅ …) and the S ₁ and S ₂ states where the molecular level is “0” is very small. Since the light is out of the visible light region, it does not emit light in the visible region.

When the molecules are brought together by transitioning to the S ₁ , S ₂ state, etc. in the state where the molecular level is "0", the ground state S ₀ and the states S ₁ , S _2, etc. are population inversion states. is emits light in the visible range (λ _f) and changes to the S _1, S _2, such as the ground state (S _0), each molecular level (m ₁ -m _{05 ...)} of the back from the state of.

The state transitioned to each molecular level m ₁ -m _{05 ...} of the ground state transitions to the ground state G of the molecular level "0" for a very short time, which is several picoseconds. At this time, the width of the transition energy is so small that light in the visible region is not emitted.

Then, when light of a specific absorption wavelength band is incident on the organic die, the same process is repeated to absorb and emit light.

In an organic die that absorbs and emits such light, a typical shape of the light absorption and emission spectrum of Rhodamine6G, which is widely used for a die laser, is shown in FIG. 2. It absorbs light and emits light in the vicinity of 5900Å.

The proper choice of solvents to dissolve the organic die and the organic die in this way makes the color reproduction of the LCD projector different from the light spectrum from the LCD illumination source due to the absorption and emission characteristics of the die as the illumination light passes through the organic die. You can get a spectrum that will help you.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 schematically shows a first embodiment of the present invention, in which an LCD illumination light source for forming parallel light in an illumination device for an LCD projector projected onto an LCD module assembly (not shown) forming an LCD projector ( 10) and [2,2'-p-phenylenebisc [5- (1-naphthyl) oxazole in a thin transparent cell 12 to absorb ultraviolet rays from the light incident from the illumination light source and emit blue light (430-450 nm). ] Is composed of a spectral converter 11 formed by dissolving an organic die 13 in a solvent (benzene) and then filling it.

According to the first embodiment of the present invention configured as described above, the visible light of the light incident on the spectrum converter 11 in parallel from the LCD illumination light source 10 passes as it is, but light in the ultraviolet band is transmitted from the organic die 13. After being absorbed, it is converted into a spectrum of 430-450nm, which is blue light, and emitted. Therefore, the emitted light becomes light in which blue light is reinforced with visible light.

In this way, the energy efficiency can be greatly improved by not only increasing the amount of blue light as compared to the existing optical system but also using the lost ultraviolet rays.

At this time, light of a wavelength not included in the absorption band has no change in direction and properties when passing through the cell of the organic die.

4 shows a second embodiment of the present invention, in which the parallel light from the LCD illumination light source 10 is focused on the spectrum converter 11 in front of the spectrum converter 11 filled with the organic die. And a second lens assembly 15 for rearranging the light emitted from the spectral converter 11 into parallel rays at the rear of the spectral converter 11. Since it is the same as that of 1st Embodiment except the same code | symbol, the same code | symbol is attached | subjected and the description about these is abbreviate | omitted.

According to the second embodiment, light incident in parallel from the illumination light source 10 for LCD is focused on the spectrum converter 11 by the first lens assembly 14. Light incident in parallel by this focusing is collected at the center of the spectrum converter 11.

Subsequently, the spectral conversion light absorbed and emitted by the organic die 13 of the spectral converter 11 becomes parallel light by the second lens assembly 15 having a large aperture, and is then projected onto the LCD projector (not shown) at the rear end thereof. Therefore, the area emitted from the spectrum converter 11 can be made small so that it can be collected at the center and can be projected to the rear LCD projector through the second lens assembly 13 without light loss.

Therefore, the second embodiment reduces the loss of spectral converted light as compared with the first embodiment.

FIG. 5 schematically shows a third embodiment of the present invention. In the second embodiment, when the cooling system is not performing well, the temperature of the organic die is increased so that the absorption and release performance originally expected cannot be obtained. And to rotate the cells of the organic die of the spectral converter 11 'to eliminate the possibility of performance degradation due to the continuous use of the organic die. It is made in the shape of a disc and is mounted on the rotating shaft 16 arranged parallel to the optical axes of the first lens assembly 14 and the second assembly 15, and the rotating shaft 16 is rotated by the motor 17 so that incident light This focusing part is continuously changed to prevent performance degradation caused by heat or continuous excitation, where reference numeral 18 is a gear and 19 is an organic die. Will showing a holder (12 ') part of the other are the same as those of the second embodiment are assigned the same reference numerals among properties in this part, description thereof will be omitted.

In the above-described embodiments of the present invention, an organic die that absorbs ultraviolet light and emits blue light has been described. However, the organic die and the solvent shown in Table 1 are selected to reduce color purity. By absorbing the light in the yellow band to emit the light in the red band, it is possible to achieve the improvement of the light efficiency and the maintenance of chromatic harmony.

TABLE 1

Organic die menstruum Main absorption wavelength Wave length Rhodamine 101 HFIPTFEEtOH, basicEtOH, acidicDMSO 572nm570nm564nm577nm586nm 625nm625nm630nm640nm650nm

As described above, the illumination device for the LCD projector of the present invention absorbs ultraviolet rays lost or light of relatively abundant wavelengths and generally has a red or green amount of light necessary for matching with blue-based light or other colors that lack light. By enhancing the light emission, not only can the light efficiency be improved, but the maintenance of chromatic harmony can be achieved.

Claims (5)

An LCD illumination light source for generating parallel light for illuminating the LCD projector; And a spectral converter which is formed of a thin transparent cell filled with an organic die dissolved in a solvent and absorbs light energy of a specific spectrum incident from the LCD illumination light source to generate light of a spectrum different from the specific spectrum. Illuminator for LCD projector, characterized in that. The method of claim 1, Wherein the organic die is 2,2'-p-phenylenebis [5- (1-nayhthyl) oxazole] and the solvent is benzene (C ₆ H ₆ ). The method of claim 1, Wherein the organic die is Rhodamine 101 and the solvent is any one of HFIP, TFC, EtOH.Basic, EtOH.Acid, and DMSO. The method according to any one of claims 1 to 3, The spectral converter comprises a first lens assembly for focusing parallel light from the LCD illumination light source in front of the spectral converter and a second lens assembly for making the output light from the spectral converter into parallel light. Lighting device for an LCD projector, characterized in that it comprises a. The method of claim 4, wherein In the spectral converter, a transparent cell filled with the organic die is formed in a disc shape, and the disc-shaped transparent cell is mounted on a rotation axis disposed in parallel with an optical axis of the first lens assembly and the second lens assembly. And a portion of the spectrum conversion device focused by the first lens assembly to be continuously changed by rotation of the rotation axis.

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