JPH05947Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a light source device for a transmissive display panel.

[Conventional technology]

Recently, as display devices that display color images using transmissive display panels such as liquid crystal display panels, light source devices that illuminate the display panel from the back side instead of providing red, green, and blue color filters on the display panel have been introduced. A display device has been proposed in which light in the three color wavelength ranges of red, green, and blue is produced, and the light in the red, green, and blue wavelength ranges is made incident on a display panel to display a color image.

The light source device of the display panel in this type of display device has conventionally used light from a light source lamp to
a first light separating means that reflects light in the red wavelength range, for example, out of the light in the three color wavelength ranges of green and blue, and transmits light in the wavelength range of other colors (green and blue); Among the light in the color wavelength range, for example, the light is passed through an optical system that combines a second light separation means that reflects light in the green wavelength range and transmits light in the wavelength range of other colors (red and blue). Therefore, a configuration has been proposed that separates light into red, green, and blue wavelength ranges. As the light separating means, a dichroic mirror is used which reflects light in a specific wavelength range and transmits light in other wavelength ranges.

As a display device using this light source device, for example, a liquid crystal projector is considered, which magnifies a display image on a liquid crystal display panel using a projection lens and projects it onto a screen surface. This liquid crystal projector includes three transmissive liquid crystal display panels that display the same image, and allows light in the red wavelength range reflected by the first light separation means to enter the first display panel. A red image is displayed on the first display panel of the lever, and the light in the green wavelength range reflected by the second light separation means is made to enter the second display panel. A green image is displayed, and light in the blue wavelength range that passes through both the first and second light separation means is incident on the third display panel.
Display a blue image on the display panel of
The display images of these three display panels are projected onto the screen surface using projection lenses, and red, green,
The configuration is such that three-color blue images are combined on the screen to display a full-color image.

That is, the light source device separates the light from the light source lamp into light in the red wavelength range, light in the green wavelength range, and light in the blue wavelength range by the light separation means, and the red, This light source device allows light in the green and blue wavelength range to enter a transmissive display panel, and by using this light source device, it is possible to display color images without installing a color filter that absorbs a lot of light on the display panel. can.

[Problem that the invention attempts to solve]

However, since the conventional light source device described above separates the light from the light source lamp into red, green, and blue wavelength range light, there is a difference in the brightness of the separated wavelength range light of each color (particularly in the blue wavelength range). The problem is that the brightness of the light in the wavelength range is low), which makes it impossible to display a color image with good color reproducibility and high brightness on a display device.

This is due to the specific energy distribution of the light from the light source lamp. That is, high-intensity xenon lamps or halogen lamps are used as light source lamps for the light source devices of display panels in display devices such as liquid crystal projectors, but the specific energy distribution of the light emitted by these lamps is as follows: Because the distribution of light in the red wavelength range, light in the green wavelength range, and light in the blue wavelength range decreases in this order, the light from the light source lamp is simply divided into red, green, and blue, as in the conventional light source device described above. If the light is separated into wavelength range lights, there will be differences in the brightness of the separated wavelength range lights of each color depending on the specific energy distribution of the light from the light source lamp, especially when using a halogen lamp as the light source lamp. (xenon lamps are expensive, so halogen lamps are advantageous from a cost perspective).The specific energy distribution of the light from the light source lamp is such that the specific energy of light in the blue wavelength range is extremely low ( (see FIG. 2), the color reproducibility and brightness of the displayed image are further deteriorated.

This idea was devised in view of the above-mentioned circumstances, and its purpose is to separate the light from the light source lamp and input it to multiple LCD panels. An object of the present invention is to provide a light source device for a display panel that allows good light to enter the panel and allows a liquid crystal display panel to display a good image.

[Means to solve problems]

The light source device of this invention is characterized by comprising a main light source lamp that enters light into a plurality of liquid crystal display panels, and an auxiliary light source lamp that compensates for the light of the main light source lamp.

[Effect]

In other words, by compensating the light from the main light source lamp that enters light into multiple liquid crystal display panels with the light from the auxiliary light source lamp, this invention can make it possible to input good light into multiple liquid crystal display panels, which in turn improves the quality of the liquid crystal display. A good image can be displayed on the panel.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings regarding a light source device for a display panel in a liquid crystal projector.

FIG. 1 shows the first embodiment of this invention. First, the structure of the liquid crystal projector will be explained.
In FIG. 1, 1 is a projector body,
On the front surface of the projector body 1, three projection lenses 2R, 2G, and 2B are arranged side by side at equal intervals.
The central projection lens 2G of the projection lenses 2R and 2B is disposed so as to face directly on a screen (not shown) disposed in front of the projector body 1, and the projection lenses 2R and 2B on both sides are disposed obliquely horizontally so that their optical axes coincide with the optical axis of the central projection lens 2G on the screen surface.
Reference numerals 3R, 3G, and 3B denote transmissive matrix liquid crystal display panels arranged in correspondence with the projection lenses 2R, 2G, and 2B inside the projector body 1. These display panels 3R, 3G, and 3B each display the same image (television image in this embodiment), with the first display panel 3R receiving light in the red wavelength range from a light source device (to be described later) and displaying a red image, the second display panel 3G receiving light in the green wavelength range from the light source device and displaying a green image, and the third display panel 3B receiving light in the blue wavelength range from the light source device and displaying a blue image.
Reference numerals 4R, 4G, and 4B denote condenser lenses made of Circular Fresnel lenses provided between the display panels 3R, 3G, and 3B and the projection lenses 2R, 2G, and 2B, respectively. Red, green, and blue images displayed by the display panels 3R, 3G, and 3B are projected through the condenser lenses 4R, 4G, and 4B.
R, 4G, and 4B are used for the projection lenses 2R, 2
The light is focused on the projection lenses 2R and 2G.
The image is enlarged by the projection lenses 2G and 2B and projected onto a screen. Reference numeral 5 denotes a main circuit board provided on one side of the projector body 1, and this main circuit board is provided with television receiver circuits such as linear circuits.
A display drive circuit board 6 drives each of the display panels 3R, 3G, and 3B.
A flexible wiring board having openings at portions corresponding to the display panels 3R, 3G, and 3B is provided with a plurality of
The display drive circuit board 6, on which LSI chips 7, 7 are attached, is connected to the main circuit board 5, and the display panels 3R, 3G, 3B are connected to the opening edge of the display drive circuit board 6.

That is, the liquid crystal projector uses three display panels 3R, 3G, and 3B to display red, green, and blue images on each display panel, and displays the display images on each of the display panels 3R, 3G, and 3B on the screen. It displays a full-color image by compositing images.

Next, a description will be given of the light source device that makes light in the red, green, and blue wavelength ranges enter the display panels 3R, 3G, and 3B.In FIG.
G, 8B are dichroic mirrors for light separation arranged horizontally in a row in the projector main body 1, facing each of the display panels 3R, 3G, 3B, and these dichroic mirrors 8R, 8G,
8B is 45° to display panels 3R, 3G, and 3B.
It is set at an angle of . Of these dichroic mirrors 8R, 8G, and 8B, the first dichroic mirror 8R facing the first display panel 3R reflects light in the red wavelength range and reflects light in the other colors (green and blue). The second dichroic mirror 8G, which is a dichroic mirror for extracting red light that transmits light in the wavelength range and faces the second display panel 3G, reflects light in the green wavelength range and A third dichroic mirror 8B facing the third display panel 3B is a dichroic mirror for extracting green light that transmits light in the blue wavelength range and transmits light in the blue wavelength range and other It is a dichroic mirror for extracting blue light that transmits light in the wavelength range of colors (red and blue). Further, reference numeral 9 denotes a high-intensity main light source lamp provided on one side of the projector body 1 so as to face the first red light extraction dichroic mirror 8R. Halogen lamps are used, which are cheaper than xenon lamps.
The light from this main light source lamp 9 is transmitted to each dichroic mirror 8R, 8 by a parabolic reflector 10.
The light is reflected in the direction in which the light beams G and 8B are lined up, and is incident on the first dichroic mirror 8R, the second dichroic mirror 8G, and the third dichroic mirror 8B in this order. On the other hand, 9a is a first auxiliary lamp provided opposite to the main light source lamp light incident path (between the first dichroic mirror 8R and the second dichroic mirror 8G) to the second dichroic mirror 8G for extracting green light. The light source lamp 9b is the main light source lamp light incident path to the third dichroic mirror 8B for extracting blue light (the second dichroic mirror 8G and the third dichroic mirror 8B).
The auxiliary light source lamps 9a and 9b are also xenon lamps having the same luminance as the main light source lamp 9. Also, 1
1a is a first light-synthesizing beam splitter provided in the main light source lamp light incident path to the second dichroic mirror 8G for extracting green light, and 11b is the main light source lamp to the third dichroic mirror 8B for extracting blue light. It is a second beam splitter for light synthesis provided in the light incidence path, and the light from the first auxiliary light source lamp 9a is reflected by a parabolic reflector 10a and enters the first beam splitter 11a,
The light from the second auxiliary light source lamp 9b is reflected by the parabolic reflector 10b and is then reflected by the second beam splitter 1.
1b. The above beam splitter 11
a and 11b are two prisms joined together, and are designed to allow the light from the main light source lamp 9 to pass through as is, and to refract the light from the auxiliary light source lamps 9a and 9b in the direction of the main light source lamp light. .
That is, the beam splitters 11a and 11b are
The auxiliary light source lamp light is superimposed on the main light source lamp light, and the first beam splitter 11a is connected to the first dichroic mirror 8 for extracting red light in the preceding stage.
The light from the first auxiliary light source lamp 9a is superimposed on the main light source lamp light (light in the green and blue wavelength range) that has passed through R, and the light is made to enter the second dichroic mirror 8G for extracting green light, and the second beam splitter 11b is the main light source lamp light (light in the blue wavelength range) that has passed through the second dichroic mirror 8G for extracting green light in the preceding stage.
The light from the first auxiliary light source lamp 9a is superimposed on the second dichroic mirror 8G for extracting green light.

In addition, in FIG. 1, 12 is the power transformer 1.
The main light source lamp 9 and the auxiliary light source lamps 9a and 9b are connected to the power circuit board 12 by lead wires 15, respectively.

Next, to explain the operation of the above-mentioned light source device, the red, green, and blue wavelength range lights R,
The light including G and B first enters the first dichroic mirror 8R for red light extraction, and the light in the red wavelength range R
is reflected by the first dichroic mirror 8R and taken out. This reflected red wavelength range light R is transmitted to the first liquid crystal display panel 3R as display panel incident light.
is incident on the display panel 3R, and a red image is displayed on the display panel 3R. In addition, the first dichroic mirror 8
The remaining light (green and blue wavelength range lights G, B) is extracted from the light transmitted through the red wavelength range light R, which is the light from the first auxiliary light source lamp 9a. , green and blue wavelength range light R,
After being combined with the green light (including light including G and B), the green light enters the second dichroic mirror 8G for extracting the green light,
The green wavelength band light G in the light is reflected by the second dichroic mirror 8G and taken out. This reflected green wavelength range light G is used as the second light incident on the display panel.
The light enters the liquid crystal display panel 3G, and causes the display panel 3G to display a green image. Furthermore, the second
The remaining light after the light transmitted through the dichroic mirror 8G, that is, the green wavelength light G, is extracted (the blue wavelength light B in the main light source lamp light, and the red and blue wavelengths in the first auxiliary light source lamp light). The area lights R, B) are sent to the second auxiliary light source lamp 9 at the second beam splitter 11b.
Light from b (red, green, blue wavelength range light R, G, B
After being synthesized with the blue light (including light including
It is reflected and taken out. This reflected blue wavelength range light B enters the third liquid crystal display panel 3B as display panel incident light, and causes the display panel 3B to display a blue image. The light transmitted through the third dichroic mirror 8G, that is, the red wavelength range light R in the first auxiliary light source lamp light, and the red and green wavelength range lights R and G in the second auxiliary light source lamp light are as follows: It is emitted to the outside as unnecessary light.

That is, the light source device transmits light from the main light source lamp 9 to a first dichroic mirror 8R for extracting red light, a second dichroic mirror 8G for extracting green light, and a third dichroic mirror 8B for extracting blue light. By sequentially inputting the red wavelength range light R, the green wavelength range light G, and the blue wavelength range light B, respectively, are extracted as the display panel incident light, and the green and blue wavelength range lights G and B are extracted. The light from the main light source lamp 9 that enters the second and third dichroic mirrors 8G and 8B (the remaining wavelength range light after the display panel incident light is extracted by the preceding light separation means) is combined with the second and third dichroic mirrors 8G and 8B. Auxiliary light source lamp 9
Beam splitter 1 for photosynthesizing the light from a and 9b
1a and 11b, the second and third dichroic mirrors 8G,
By increasing the amount of light incident on 8B, green and blue wavelength range light G, which is extracted by this light separation means, is
The specific energy of B is increased, and in this way, the wavelength range lights R, G, and B of each color are separated into light in the three color wavelength ranges of red, green, and blue. Since the difference in specific energy can be reduced at a high level, the liquid crystal projector can display a color image with good color reproducibility and high brightness on the screen surface.

That is, FIG. 2 shows the specific energy distribution of the halogen lamp used as the light source lamp in the above embodiment. As shown in the figure, the specific energy distribution of the halogen lamp is
The specific energy of the light in the green wavelength range decreases in this order, followed by the light in the blue wavelength range, and the specific energy of the light in the blue wavelength range is particularly low. Therefore, if the main light source lamp 9 is the only light source lamp and the light from the main light source lamp 9 is simply separated into red, green, and blue wavelength range light, the brightness of the separated wavelength range light of each color will vary. A difference occurs depending on the specific energy distribution of the light from the main light source lamp 9, resulting in poor color reproducibility and brightness of the displayed image.
Therefore, in the light source device of the above embodiment, the light in the red wavelength range, which originally has high specific energy, is transmitted to the main light source lamp 9.
The light in the green wavelength range with the next highest specific energy is extracted from the light of the two lamps, the main light source lamp 9 and the first auxiliary light source lamp 9a, and the light in the blue wavelength range with the lowest specific energy is extracted. The light comes from the main light source lamp 9 and the first and second auxiliary light source lamps 9a, 9.
In this way, the green wavelength range light G to the second display panel and the blue wavelength range light G to the third display panel are finally obtained. The specific energy of light B is the third
Because it can be made higher as shown in the figure,
By making the specific energy of the green and blue wavelength range lights G and B close to the specific energy of the red wavelength range light R extracted only from the light of the main light source lamp 9, the wavelength range lights R, G, and B of each color are The difference in specific energy can be made small at high levels. However, in Figure 3, the specific energy of the blue wavelength range light B is slightly lower than the specific energy of the red and green wavelength range lights R and G, but this degree of difference is due to color reproducibility. has little effect on

In the above embodiment, the first and second auxiliary light source lamps 9a and 9b have the same luminance as the main light source lamp 9, but the specific energy of the green wavelength range light G finally taken out is higher than that of the red light source. If the specific energy of the wavelength range light R becomes too high, the luminance of the first auxiliary light source lamp 9a may be lowered to some extent; even in that case, the luminance of the first auxiliary light source lamp 9a 2nd by the amount lowered
If the luminance of the auxiliary light source lamp 9b is increased, the specific energy of the blue wavelength range light B that is finally extracted will not be reduced. Further, in the above embodiment, the specific energy of the blue wavelength range light B finally extracted is the red and green wavelength range lights R, G.
Although it is slightly lower than the specific energy of
By using two lamps as the second auxiliary light source lamp 9b, or by increasing the luminance of the second auxiliary light source lamp 9b, the specific energy of the blue wavelength range light B can be further increased by the specific energy of the red wavelength range light R. You can get it close to.

In addition, in the above embodiment, the three liquid crystal display panels 3R, 3G, and 3B are used to synthesize three-color images of red, green, and blue displayed by each display panel on the screen surface, and display a full-color image. Although we have described the light source device for a projector, the light source device of this invention can also be applied to a liquid crystal projector that uses a single liquid crystal display panel to display a full color image on this display panel and projects this color image onto the screen surface. It is something.

That is, FIGS. 4 and 5 show a second embodiment of this invention, and the liquid crystal projector is provided with one projection lens 2 on the front surface of the projector body 1, as shown in FIG. In addition, one transmissive matrix liquid crystal display panel 3 is provided within the projector body 1 in correspondence with the projection lens 2.
is arranged, and a condensing lens 4 made of a circular Fresnel lens is provided between the display panel 3 and the projection lens 2. In addition, the first
Components corresponding to those shown in the figures are given the same reference numerals in the figures and their explanations will be omitted.

On the other hand, the light source device of the display panel 3 converts light from a light source lamp (halogen lamp) into red, green, and blue wavelength range light R in the same way as the light source device of the first embodiment.
In addition to extracting G and B, each wavelength range light R,
G and B are each made into a large number of narrow stripes of light and are incident on the display panel 3, and this light source device has the following configuration. Note that in the light source device of this embodiment, the configuration of the portion that extracts the red, green, and blue wavelength range lights R, G, and B from the light of the light source lamp is exactly the same as that of the first embodiment. Description of this part will be omitted by attaching the same reference numeral to the figure. In Figure 4, 15R, 15
G and 15B are slit plates respectively provided in the optical path of the light reflected by the first, second and third dichroic mirrors 8R, 8G and 8B. These slit plates 15R, 15G, and 15B are opaque plates that block light and are provided with a large number of narrow striped light-transmitting slits in parallel.
Each slit of the first slit plate 15R facing the dichroic mirror 8R is connected to each signal electrode S ₁ , S ₂ , S ₃ . . . (fifth
1st and 4th signal electrodes (see figure)
A second dichroic mirror 8G for extracting green light is formed corresponding to S ₁ , S ₄ .
Each slit of the slit plate 15G is 2nd, 5th
Each slit of the third slit plate 15B, which is formed corresponding to the main signal electrodes S ₂ , S ₅ , and faces the third dichroic mirror 8B for extracting blue light, is the third, sixth, and so on. ... signal electrodes S ₃ , S ₆ ...
It is formed to correspond to... In addition, the display panel 3 includes each dichroic mirror 8R, 8G, 8B.
For example, the first slit plate 15R is attached to one of the first dichroic mirrors 8R for extracting red light.
This display panel 3 and the first
A red wavelength range light R is provided between the slit plate 15R and the slit plate 15R.
A first light-synthesizing dichroic mirror 16 transmits light in the red and green wavelength ranges and reflects light in other wavelength ranges (here, light in the green wavelength range G), and transmits light in the red and green wavelength ranges R and G and reflects light in other wavelength ranges. range light (here, blue wavelength range light B)
A second light-synthesizing dichroic mirror 17 for reflecting light is provided at an inclination angle of 45° with its light reflecting optical axis aligned with the incident optical axis to the display panel 3. Further, 18 is a first reflecting plate provided to face the second slit plate 15G and the first light-synthesizing dichroic mirror 16, and 19 is the third slit plate 15B and the second light-synthesizing dichroic mirror 16. A second mirror provided opposite to the dichroic mirror 17
The first reflecting plate 18 converts the green wavelength range light G, which is reflected by the second dichroic mirror 8G for extracting green light and becomes multiple stripes of light through the slit plate 15G, into a first reflector. The second reflecting plate 19 receives the blue light, which is reflected by the third dichroic mirror 8B for extracting the blue light and passes through the slit plate 15B into a large number of stripes. The wavelength range light B is reflected toward a second light-synthesizing dichroic mirror 17.

To explain the operation of this light source device, the light source device of this embodiment also extracts the red wavelength range light R from the light of the main light source lamp 9 by the first dichroic mirror 8R, and Light source lamp 9
A second dichroic mirror 8G extracts the green wavelength light G from the light a, and further extracts the green wavelength light G from the light G by the main light source lamp 9 and the first and second auxiliary light source lamps 9a and 9b.
A third dichroic mirror 8B extracts the blue wavelength light B from the light of the red wavelength range R reflected by the first dichroic mirror 8R. After being converted into striped light, the light passes through the first light-synthesizing dichroic mirror 16 and the second light-synthesizing dichroic mirror 17 and enters the display panel 3. Further, the green wavelength range light G reflected by the second dichroic mirror 8G is transmitted to the slit plate 15.
After being converted into multiple stripes of light through G, it is reflected by the reflecting plate 18 toward the first light-synthesizing dichroic mirror 16, and reflected by this dichroic mirror 16 to form a second light-synthesizing The light passes through the dichroic mirror 17 and enters the display panel 3. Furthermore, the third dichroic mirror 8
The blue wavelength range light B reflected by B passes through the slit plate 15B and is converted into multiple stripes of light, and is then reflected by the reflection plate 19 toward the second light-synthesizing dichroic mirror 17. is reflected by this dichroic mirror 17 and displayed on the display panel 3.
incident on . In this case, each slit plate 15
Since the slits R, 15G, and 15B are formed as described above, the light incident on the display panel 3 is divided into the striped light R in the red wavelength range and the striped light R in the green wavelength range, as shown in FIG. The striped light G and the striped light B in the blue wavelength range enter the display panel 3 as a striped light flux that is arranged alternately (the striped light R in the red wavelength range is the first light beam on the display panel 3,
The stripe light G in the green wavelength range is incident corresponding to the signal electrodes S ₁ , S ₄ ... of the fourth ... signal electrode S ₂ , S ₅ ... of the second, fifth ... incident,
Striped light B in the blue wavelength range is the 3rd and 6th...
The stripe light R in the red wavelength range is incident on the signal electrodes S ₁ , S ₄ ... of the display panel 3 in correspondence with the signal electrodes S ₃ , S ₆ ...
A red dot displayed by driving ... and a signal electrode S ₂ on which the striped light G in the green wavelength range enters,
The green dot displayed by the drive of _S5 ...
Signal electrode where stripe light B in the blue wavelength range enters
A full color image is displayed by a combination of three color dots with a blue dot displayed by driving S ₃ , S ₆ . In FIG. 5, C is a scanning electrode formed in parallel in a direction orthogonal to the signal electrodes S ₁ , S ₂ , S ₃ .
are formed on one transparent substrate (here, the front side substrate) 3a of the display panel, and signal electrodes S ₁ , S ₂ , S ₃ . . .
is formed on the other transparent substrate (here, the back side substrate) 3b.

That is, the light source device of the second embodiment converts the lights R, G, and B in the red, green, and blue wavelength ranges separated from the light of the light source lamp into a large number of stripes, and converts the lights R, G, and B of each color into stripes. , G, and B are incident on the display panel 3 to display a full-color image on the display panel 3. According to this light source device, it is possible to display a full-color image with only one liquid crystal display panel 3. In addition, similar to the light source device of the first embodiment, the difference in the specific energy of the wavelength range lights R, G, and B of each color, which are separated into light in the three color wavelength ranges of red, green, and blue, and extracted. By reducing the size to a high level, it is possible to display a color image with good color reproducibility and high brightness on the liquid crystal display panel 3, and to project this onto the screen surface.

In the first and second embodiments, the light from the main light source lamp 9 is transmitted through the red light extraction dichroic mirror 8R, the green light extraction dichroic mirror 8G, and the blue light extraction dichroic mirror 8B. However, the dichroic mirror 8G for extracting green light and the dichroic mirror 8B for extracting blue light may be arranged in the opposite manner to the above embodiment. Further, in the above embodiment, the light from the main light source lamp 9 and the auxiliary light source lamps 9a and 9b is made to enter both the green light extraction dichroic mirror 8G and the blue light extraction dichroic mirror 8B. The specific energy of the green wavelength range light G in the light from the light source lamp 9 is the red wavelength range light R.
Although it is low compared to the specific energy of , it does not deteriorate color reproducibility so much, so even if the green wavelength light G is extracted only from the light of the main light source lamp 9 without using the auxiliary light source lamp. good.
Furthermore, in the above embodiment, the light R, G,
Dichroic mirror 8R for taking out B,
8G and 8B are designed to reflect light in the wavelength range that is extracted as incident light on the display panel and transmit light in other wavelength ranges. It may also be a device that transmits light in different wavelength ranges and reflects light in other wavelength ranges. In that case, the direction of each dichroic mirror and the direction of the main light source lamp are adjusted so that the light transmitted through each dichroic mirror is incident on the display panel. All you have to do is set the position of the auxiliary light source lamp. Further, in the above embodiment, halogen lamps are used as the main light source lamp and the auxiliary light source lamp, but this light source lamp may also be a xenon lamp, or one of the main light source lamp and the auxiliary light source lamp is a xenon lamp, and the other is a xenon lamp. It is also possible to use a halogen lamp.

Note that this invention can of course be widely applied not only to liquid crystal projectors but also to light source devices for display panels in display devices that display color images using transmissive display panels (liquid crystal display panels, electrochromic display panels, etc.). It is.

[Effect of idea]

The light source device of this invention is a light source device for a liquid crystal display panel that separates light from a light source lamp and makes it incident on a plurality of liquid crystal display panels. Equipped with an auxiliary light source lamp that compensates for the light from the lamp, the light from the main light source lamp that enters multiple LCD panels is compensated for by the light from the auxiliary light source lamp, allowing good light to enter multiple LCD panels. Therefore, a good image can be displayed on the liquid crystal display panel.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of a liquid crystal projector showing the first embodiment of this invention, Fig. 2 is a specific energy distribution diagram of a halogen lamp, and Fig. 3 is a wavelength range of red, green, and blue incident on the display panel. FIGS. 4 and 5 are diagrams showing the specific energy of light, and are a cross-sectional plan view of a liquid crystal projector showing a second embodiment of the invention, and a diagram showing incident light on a display panel. 1...Projector main body, 2, 2R, 2G, 2
B... Projection lens, 3, 3R, 3G, 3B... Display panel, 4, 4R, 4G, 4B... Condensing lens, 8R... First dichroic mirror for red light extraction, 8G... Green light extraction Second dichroic mirror for use, 8B...Third dichroic mirror for extracting blue light, 9...Main light source lamp, 9a, 9
b... Auxiliary light source lamp, 11a, 11b... Beam splitter for photosynthesis, 15R, 15G, 15B
...Slit plate, 16,17...Dichroic mirror for photosynthesis, 18,19...Reflector, R...
Red wavelength range light, G...green wavelength range light, B...blue wavelength range light.

Claims (1)

[Scope of utility model registration request] In a light source device for a liquid crystal display panel that separates light from a light source lamp and makes it incident on multiple liquid crystal display panels, a main light source lamp that makes light incident on multiple liquid crystal display panels and compensation for the light from this main light source lamp are used. A light source device for a display panel, comprising an auxiliary light source lamp.