JP2007109617A - Light emitting device, lighting system, electrooptical device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system capable of easily adjusting white balance of white light. <P>SOLUTION: This lighting system 10 is provided with a light emitting device having a first light emitting means, a second light emitting means and a blue light wavelength conversion means. The first light emitting means is a white LED 14 and emits first blue light having a predetermined wavelength at a peak. The second light emitting means is a blue LED 15 and emits second blue light. The blue light wavelength conversion means is a YAG (yttrium-aluminum-garnet)-based phosphor and converts a part of the first blue light to yellow light. The chromaticity of white light being synthesized light of the first blue light, the converted yellow light, and the second blue light is adjusted to a predetermined chromaticity by adjusting both the brightness values of the first and second blue light rays. Thereby, the lighting system 10 can emit white light adjusted to a predetermined white light chromaticity only by using the light emitting means emitting blue light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light emitting device used as a light source for an illumination device of an electro-optical device.

An electro-optical device typified by a liquid crystal display device has a structure in which an electro-optical material such as liquid crystal is held between two substrates. For example, in a liquid crystal display device, an illumination device is provided on the back side of the liquid crystal display panel in order to perform transmissive display. Some illuminating devices use a plurality of single-ship white LEDs (Light Emitting Diodes) as a light-emitting device as a light source. The single-chip white LED is composed of a blue LED that emits blue light having a wavelength of 430 to 480 nm and a YAG (yttrium, aluminum, garnet) phosphor. Single chip type white LED is blue light from blue LED inside.
Yellow light is generated by exciting the AG phosphor, and white light is generated by mixing blue light and yellow light. The liquid crystal display device transmits white light emitted from the illuminating device to light of each wavelength of red (R), green (G), and blue (B) laminated on the substrate of the liquid crystal display panel. Color display is realized by transmitting through the filter.

In such a single-chip type white LED, the emission chromaticity varies depending on the wavelength of the blue light emitted from the blue LED and the amount of the YAG phosphor. The following Patent Document 1 describes a method of compensating for variations in emission chromaticity by arranging a chromaticity correction LED together with the above-described white LED.

JP 2001-209049 A

However, when white light emitted from the illumination device is transmitted through a liquid crystal display panel having RGB color filters, the blue light component of white light is absorbed, so that white display is performed on the liquid crystal display panel. The chromaticity of white light at may be significantly different from the chromaticity of white light emitted from the lighting device. Recently, in addition to RGB color filters, cyan (
A liquid crystal display device having a color filter that transmits light having a wavelength of C) is also considered. However, in the liquid crystal display panel having the RGBC color filter, compared with the liquid crystal display panel having the RGB color filter, C By adding the color filter, the white point is
There is a tendency to shift to the green side.

This invention is made | formed in view of said point, and makes it a subject to provide the illuminating device which can adjust the white balance of white light easily.

In one aspect of the present invention, a lighting device including a light emitting device, wherein the light emitting device emits first blue light having a predetermined wavelength as a peak, and the first blue light. A blue light wavelength converting means for converting a part of the light into yellow light, and a second light emitting means for emitting a second blue light emitted by a light emitting means different from the first blue light, The intensity of the first blue light and the intensity of the second blue light are set so that the white light, which is the combined light of the first blue light, the second blue light, and the yellow light, has a predetermined chromaticity. Both luminosities are adjusted.

For example, the illumination device functions as a backlight of a display panel, and includes a light emitting device as a light source unit. The light emitting device includes a first light emitting means, a second light emitting means,
Blue light wavelength conversion means. The first light emitting means is, for example, a blue LED, and emits first blue light having a predetermined wavelength as a peak. The second light emitting means is, for example, blue L
ED and emits second blue light. The blue light wavelength conversion means is, for example, a YAG (yttrium, aluminum, garnet) phosphor, and converts a part of the first blue light into yellow light. The chromaticity of white light, which is the combined light of the first blue light, the second blue light, and the yellow light, is adjusted by adjusting both the luminous intensity of the first blue light and the luminous intensity of the second blue light. Thus, the chromaticity is adjusted to a predetermined value. Thereby, the said illuminating device can emit the white light adjusted to the chromaticity of predetermined | prescribed white light using only the light emission means which light-emits blue light.

In one aspect of the above illumination device, the light emitting device further includes a third light emitting unit that emits third blue light having a peak different from a wavelength that is the peak of the first blue light. Prepared,
The blue light wavelength converting means converts a part of the first blue light and a part of the third blue light into yellow light, and converts the first blue light, the second blue light, and the first light. 3, and the third blue light so that the white light, which is the combined light of the blue light of 3 and the yellow light, has a predetermined chromaticity, the luminous intensity of the first blue light, the luminous intensity of the second blue light, and the third blue light All of the luminosity is adjusted. Accordingly, the lighting device can emit white light in which white balance adjustment is performed over a wide range in the X-axis direction and the Y-axis direction in the xy chromaticity diagram.

In a preferred embodiment of the illumination device, the light emitting device includes the first blue light and the second light.
The blue light has a peak at a wavelength in the range of 430 nm to 480 nm.

In another aspect of the present invention, an electro-optical device including the above-described illumination device and a display panel illuminated by the illumination device can be configured. The electro-optical device is, for example, a liquid crystal display device, and the display panel is, for example, a liquid crystal display panel. Here, in the display panel, when one display pixel is composed of red, green, and blue sub-pixels,
When the white light emitted from the lighting device passes through the display panel, the blue light component is absorbed,
The white balance of white light will be lost. In the illumination device described above, the luminous intensity of blue light can be adjusted, so that the blue light component of white light absorbed by the display panel can be supplemented.

In still another aspect of the invention, the electro-optical device includes a first light emitting unit that emits first blue light having a predetermined wavelength as a peak, and a second light having a peak that has a wavelength different from the predetermined wavelength. Second light emitting means for emitting blue light; and blue light wavelength converting means for converting a part of the first blue light and a part of the second blue light into yellow light, Both the luminous intensity of the first blue light and the luminous intensity of the second blue light so that the white light that is the combined light of the blue light, the second blue light, and the yellow light has a predetermined chromaticity. And a display panel including a plurality of display pixels on which light emitted from the illumination device is incident.
Each display pixel includes a plurality of sub-pixels, and the sub-pixels include a blue-based hue colored region, a red-based hue colored region, and a blue color in a visible light region whose hue changes according to a wavelength. Any one of four colored areas composed of colored areas of two hues selected from hues up to yellow is provided. Such a display panel is capable of displaying in a wide hue range, and is equipped with the above-described illumination device, thereby supplementing the blue light component of white light absorbed by the display panel and having high color reproducibility. An optical device can be provided. In this case, it is preferable that one of the colored regions of the two hues selected from the hues of blue to yellow has a hue of blue to green. Or it is preferable that the other coloring area | region of the coloring area | region of the said 2 types of hues selected in the hue from blue to yellow is a hue of green to orange. According to this, the setting of the coloring regions of the two hues is optimized, and white light with a more white balance can be obtained.

In still another aspect of the invention, the electro-optical device includes a first light emitting unit that emits first blue light having a predetermined wavelength as a peak, and a second light having a peak that has a wavelength different from the predetermined wavelength. Second light emitting means for emitting blue light; and blue light wavelength converting means for converting a part of the first blue light and a part of the second blue light into yellow light, Both the luminous intensity of the first blue light and the luminous intensity of the second blue light so that the white light that is the combined light of the blue light, the second blue light, and the yellow light has a predetermined chromaticity. And a display panel including a plurality of display pixels on which light emitted from the illumination device is incident.
One display pixel includes a plurality of sub-pixels, and the sub-pixel has a peak of the wavelength of transmitted light,
A first colored region at 415 to 500 nm, a second colored region at 600 nm or more, and 48
One of four types of colored regions including a third colored region in the range of 5 to 535 nm and a fourth colored region in the range of 500 to 590 nm is provided. Such a display panel can display in a wide hue range, but has a high color reproducibility by supplementing the blue light component of white light absorbed by the display panel by providing the above-described illumination device. An electro-optical device can be provided. In this case, it is preferable that the peak of the wavelength of the transmitted light of the third colored region is 495 to 520 nm. Alternatively, the wavelength peak of the transmitted light of the fourth colored region is 510 to 58.
It is preferably 5 nm. According to this, the setting of the said 3rd coloring area | region or the said 4th coloring area | region is optimized, and white light with more white balance can be obtained.

In still another aspect of the invention, the electro-optical device includes: a first light emitting unit that emits first blue light having a predetermined wavelength as a peak; and a part of the first blue light is converted into yellow light. A lighting device comprising: a blue light wavelength converting means; a second light emitting means for emitting a second blue light emitted by a light emitting means different from the first blue light; and a plurality of display pixels. A display panel on which light emitted from the illumination device is incident, wherein the display pixel includes a plurality of sub-pixels, and the sub-pixels are colored layers of colors of red, green, blue, and cyan. It is equipped with either. One display pixel of the display panel is composed of sub-pixels each including one of colored layers of red, green, blue, and cyan. That is, in the display panel, one display pixel is composed of red, green, blue, and cyan sub-pixels. In such a display panel, one display pixel is red,
The white point tends to shift more to the green side by adding cyan subpixels than a display panel composed of green and blue subpixels. Therefore, by using the above illumination device as an illumination device for a display panel in which one display pixel is composed of sub-pixels of red, green, blue, and cyan colors, a large amount of blue light component of white light is obtained. The white point of the white light shifted to the green side can be adjusted to the optimum white point.

In still another aspect of the invention, an electronic apparatus including the above-described electro-optical device in a display portion can be configured.

In still another aspect of the present invention, a light emitting device converts a first light emitting unit that emits first blue light having a predetermined wavelength into a peak, and a part of the first blue light into yellow light. A blue light wavelength converting means; and a second light emitting means for emitting a second blue light emitted by a light emitting means different from the first blue light. Accordingly, the light emitting device can emit white light having a predetermined chromaticity using only the light emitting means that emits blue light.

In still another aspect of the present invention, two light emitting means for emitting two blue lights respectively, and blue light wavelength conversion for converting a part of any one of the two blue lights into yellow light. A method of manufacturing an electro-optical device including a light emitting device, a lighting device manufacturing step of manufacturing a lighting device including the light emitting device, a display panel manufacturing step of manufacturing a display panel, the lighting device, and the A combination step of combining the display panels, and a luminous intensity adjusting step of adjusting both luminous intensity of the two blue lights. In this manner, white balance of white light can be adjusted during the manufacturing process of the electro-optical device.

In a preferred aspect of the method for manufacturing the electro-optical device, the luminous intensity adjusting step is performed in a pre-process of the combining step, and the luminous intensity of the two blue lights is based on light emitted from the illumination device. Adjust the white balance by adjusting both of the above.

In another aspect of the method for manufacturing the electro-optical device, the luminous intensity adjusting step is performed after the combining step, and the luminous intensity of the two blue lights is based on the light emitted from the display panel. Adjust the white balance by adjusting both of the above. Thereby, the white balance of the white light projected on the display screen that is actually visually recognized by the observer can be adjusted.

In a preferred aspect of the method for manufacturing the electro-optical device, the display panel includes a plurality of display pixels, and each of the display pixels has a blue color in a visible light region whose hue changes according to a wavelength. It is composed of sub-pixels of each color of a hue coloring area, a red hue coloring area, and two hue coloring areas selected from blue to yellow hues.

In another preferable aspect of the method for manufacturing the electro-optical device, the display panel includes a plurality of display pixels, and each of the display pixels has a peak of a wavelength of transmitted light in a range of 415 to 500 nm. It is composed of a colored region, a second colored region having a thickness of 600 nm or more, a third colored region having a wavelength of 485 to 535 nm, and a sub pixel of each color of a fourth colored region having a thickness of 500 to 590 nm.

In a further preferred aspect of the method for manufacturing the electro-optical device, the display panel includes a plurality of display pixels, and each display pixel includes red, green, blue, and cyan sub-pixels. .

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Liquid Crystal Display]
First, a configuration of a liquid crystal display device 100 to which the illumination device according to the first embodiment and the second embodiment can be applied will be described with reference to FIGS.

FIG. 1 is a plan view schematically showing a schematic configuration of the liquid crystal display device 100. In FIG. 1, a color filter substrate 92 is disposed on the front side (observation side) of the paper, and an element substrate 91 is disposed on the back side of the paper. In FIG. 1, the vertical direction (column direction) of the paper surface is the Y direction, and the horizontal direction of the paper surface (
(Row direction) is defined as the X direction. In FIG. 1, R (red), G (green), B (blue) C (
Each region corresponding to cyan) represents one subpixel SG, and one row and four columns of subpixels SG corresponding to R, G, B, and C represent one pixel region AG.

FIG. 2 is an enlarged cross-sectional view of one pixel region AG along the cutting line AA ′ in the liquid crystal display device 100. As shown in FIG. 2, the liquid crystal display device 100 includes a liquid crystal display panel 30 and the illumination device 10 according to the first embodiment or the illumination device 10a according to the second embodiment.
In the liquid crystal display panel 30, an element substrate 91 and a color filter substrate 92 disposed to face the element substrate 91 are bonded together via a frame-shaped sealing material 5, and liquid crystal is enclosed inside the sealing material 5. Thus, the liquid crystal layer 4 is formed. On the outer surface of the element substrate 91 of the liquid crystal display panel 30, the illumination device 10 according to the first embodiment or the illumination device 10a according to the second embodiment is provided.

The liquid crystal display device 100 is a liquid crystal display device for color display configured using four colors of RGBC, and an active matrix driving type liquid crystal using an a-Si TFT (Thin Film Transistor) element as a switching element. It is a display device.

A planar configuration of the element substrate 91 will be described. On the inner surface of the element substrate 91, a plurality of source lines 32, a plurality of gate lines 33, a plurality of a-Si TFT elements 37, a plurality of pixel electrodes 34, a driver IC 40, an external connection wiring 35, and an FPC ( Flexible Printed Circu
it) 41 is formed or mounted.

As shown in FIG. 1, the element substrate 91 has a protruding region 31 that protrudes outward from one side of the color filter substrate 92, and a driver IC is formed on the protruding region 31.
40 is implemented. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 35, and the other end side of the plurality of external connection wirings 35 is electrically connected to the FPC 41. It is connected. Each source line 32 is formed so as to extend in the Y direction and at an appropriate interval in the X direction, and one end side of each source line 32 is connected to an output side terminal (not shown) of the driver IC 40. Electrically connected.

Each gate line 33 includes a first wiring 33a formed so as to extend in the Y direction, and a second wiring 33b formed so as to extend in the X direction from the terminal portion of the first wiring 33a. ing. The second wiring 33 b of each gate line 33 is formed to extend in the direction intersecting each source line 32, that is, in the X direction and at an appropriate interval in the Y direction. One end of one wiring 33a is electrically connected to a terminal (not shown) on the output side of the driver IC 40. TF is provided at a position corresponding to the intersection of each source line 32 and each gate line 33 between the second wirings 33b.
A T element 37 is provided, and each TFT element 37 is electrically connected to each source line 32, each gate line 33, each pixel electrode 34, and the like. Each TFT element 37 and each pixel electrode 34 are
It is provided at a position corresponding to each sub-pixel SG on the substrate 1 such as glass. Each pixel electrode 3
4 is formed of a transparent conductive material such as ITO (Indium-Tin Oxide).

A region in which a plurality of one pixel region AG is arranged in a matrix in the X direction and the Y direction is an effective display region V (a region surrounded by a two-dot chain line). In the effective display area V, images such as letters, numbers, and figures are displayed. The area outside the effective display area V is a frame area 38 that does not contribute to display. Further, each source line 32, each gate line 33, and each TFT element 37.
An alignment film (not shown) is formed on the inner surfaces of the pixel electrodes 34 and the like.

Next, the planar configuration of the color filter substrate 92 will be described. As shown in FIG. 2, the color filter substrate 92 is formed on a substrate 2 such as glass on a light shielding layer (generally called “black matrix”, hereinafter simply abbreviated as “BM”), R, G, B , C colored layer 6R
, 6G, 6B, 6C, the common electrode 8, and the like. The BM is formed at a position that partitions each subpixel SG. In the following description or drawings, when a component is shown regardless of color, it is simply written as “colored layer 6”, and when a component is shown by distinguishing colors,
For example, it is written as “colored layer 6R”. This colored layer 6 constitutes a color filter. The common electrode 8 is made of a transparent conductive material such as ITO like the pixel electrode, and is formed over substantially the entire surface of the color filter substrate 92. The common electrode 8 is a region E1 at the corner of the sealing material 5.
Are electrically connected to one end side of the wiring 36 and the other end side of the wiring 36 is
The driver IC 40 is electrically connected to an output terminal corresponding to COM.

Next, the illumination devices 10 and 10a will be described. The illuminating devices 10 and 10a include a light guide plate 11
And the light source unit 12. The light source unit 12 emits light L to the end surface 11 c of the light guide plate 11. The light source unit 12 includes a plurality of white LEDs and blue LEDs which are point light sources. White LE
D emits white light, and the blue LED emits blue light. The lighting device 10 according to the first embodiment and the lighting device 10a according to the second embodiment will be described in detail later.

The light L emitted from the light source unit 12 is an end surface of the light guide plate 11 (hereinafter referred to as “light incident end surface”) 11.
When entering the light guide plate 11 from c, changing the direction by repeating reflection on the light exit surface 11a and the reflection surface 11b of the light guide plate 11, and when the angle formed between the light exit surface 11a of the light guide plate 11 and the light L exceeds the critical angle,
Light exits from the light exit surface 11a of the light guide plate 11 to the liquid crystal display panel 30 as illumination light L, respectively. The liquid crystal display device 100 is illuminated by the light L passing through the liquid crystal display panel 30. Thereby, the liquid crystal display device 100 can display images, such as a character, a number, and a figure, and an observer can visually recognize an image.

In the liquid crystal display device 100, G1, G2,..., Gm−1, G are driven by the driver IC 40 based on the signal and power from the FPC 41 connected to the main board of the electronic device.
The gate lines 33 are sequentially and exclusively selected one by one in the order of m (m is a natural number), and a gate signal of a selection voltage is supplied to the selected gate line 33 while the other non-selected gates. The line 33 is supplied with a non-selection voltage gate signal. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 34 located at positions corresponding to the selected gate lines 33, respectively, corresponding S1, S2,..., Sn-1, Sn ( n is a natural number) and is supplied through the source line 32 and the TFT element 37. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the liquid crystal display device 100 is switched to the non-display state or the intermediate display state.

As shown in FIG. 2, one pixel region AG in the liquid crystal display device 100 is RGB
Although it is configured from the four colored layers 6 of C, it is not limited to this. Instead of this, one pixel area AG in the liquid crystal display device 100 is an RGB having a general pixel area configuration.
It can also be comprised from the colored layer 6 of these three colors.

Furthermore, each colored region provided with each colored layer 6R, 6G, 6B, 6C is connected to each subpixel S.
G corresponds to G, and one pixel area AG is composed of four (four kinds) colored areas. 4
Among the visible light regions (380 to 780 nm) in which the hue changes according to the wavelength, the color coloring region includes a blue hue coloring region, a red hue coloring region, and a hue from blue to yellow. It may be composed of colored regions of two kinds of hues selected in (1). Although it is used here as a system, for example, if it is a blue system, it is not limited to a pure blue hue, but includes a bluish purple or a bluish green. If it is a red hue, it is not limited to red but includes orange. These colored regions may be composed of a single colored layer, or may be composed of a plurality of colored layers having different hues. Also,
Although these colored regions are described in terms of hue, the hue can be set by appropriately changing the saturation and lightness.

The specific hue range of the four colored regions is, for example, that the colored region of a blue hue is blue-violet to blue-green, more preferably indigo to blue. The colored region of the red hue is orange to red. One colored region selected with a hue from blue to yellow is blue to green, more preferably blue-green to green. The other colored region selected with a hue from blue to yellow is from green to orange, more preferably from green to yellow. Or it is green to yellowish green. Here, each colored region is
The same hue is never used. For example, when a green hue is used in two colored regions selected from hues of blue to yellow, the other uses a blue or yellowish green hue for one green. Thereby, a wider range of color reproducibility than the conventional RGB colored region can be realized.

In addition, a wide range of color reproducibility has been described in terms of hue, but the hue of a colored region may be set based on the peak of the wavelength of transmitted light that has passed through the hue. For example, the blue colored region is a colored region having a wavelength peak of 415 to 500 nm, preferably a colored region of 435 to 485 nm. The red colored region is a colored region having a wavelength peak of 600 nm or more, and preferably a colored region having a wavelength peak of 605 nm or more. One colored region selected with a hue from blue to yellow is a colored region having a wavelength peak at 485-535 nm, preferably 495-52.
This is a colored region at 0 nm. The other colored region selected with a hue from blue to yellow is a colored region having a wavelength peak at 500-590 nm, preferably a colored region at 510-585 nm, or a colored region at 530-565 nm.

Moreover, you may perform the setting of the coloring area | region of 4 colors with an xy chromaticity diagram. Blue colored areas are x ≦ 0.
151, y ≦ 0.056, preferably 0.134 ≦ x ≦ 0.151, 0.034 ≦ y ≦ 0.0
56 is a colored region. The red coloring region is a coloring region satisfying 0.643 ≦ x and y ≦ 0.333, and preferably a coloring region satisfying 0.643 ≦ x ≦ 0.690 and 0.299 ≦ y ≦ 0.333. One colored region selected with a hue from blue to yellow is a colored region in which x ≦ 0.164 and 0.453 ≦ y, preferably a colored region in which 0.098 ≦ x ≦ 0.164 and 0.453 ≦ y ≦ 0.759 . The other colored region selected with a hue from blue to yellow is a colored region at 0.257 ≦ x, 0.606 ≦ y,
Preferably, it is a colored region satisfying 0.257 ≦ x ≦ 0.357 and 0.606 ≦ y ≦ 0.670.

These four colored areas can be applied within the above-described range when the sub-pixel includes a transmission area and a reflection area.

Examples of the configuration of the four colored regions include the following.
(1) Colored areas having hues of red, blue, green, and cyan (blue green).
(2) Colored areas with hues of red, blue, green, and yellow.
(3) Colored areas of red, blue, dark green, and yellow.
(4) Colored areas with hues of red, blue, emerald, and yellow.
(5) A colored region in which the hue is red, blue, dark green, or yellowish green.
(6) Colored areas with hues of red, blue-green, dark green, and yellow-green.

Further, although the liquid crystal display device 100 is shown as a completely transmissive liquid crystal display device, the present invention is not limited to this, and a transflective liquid crystal display device may be used instead. further,
As shown in FIG. 1, a TFT element 37 is used as a switching element.
However, the present invention is not limited to this, and a TFD (Thin Film Diode) element may be used instead.

[First embodiment]
In FIG. 3, the top view of the illuminating device 10 which concerns on 1st Embodiment is shown. As shown in FIG. 3, the same number of white LEDs 14 and blue LEDs 15 described above are arranged in the light source unit 12. The light L emitted from the light source unit 12 is a combined light in which the white light emitted from the white LED 14 and the blue light emitted from the blue LED 15 are mixed. The white LED 14 emits white light when the current Ia flows. If the current amount of the current Ia is increased, the luminous intensity of the white light emitted from the white LED 14 is increased, and if the current amount of the current Ia is decreased, the luminous intensity of the white light emitted from the white LED 14 is decreased. On the other hand, the blue LED 15 emits blue light when the current Ib flows. If the current amount of the current Ib is increased, the luminous intensity of the blue light emitted from the blue LED 15 is increased, and if the current amount of the current Ib is decreased, the blue LED 15 is increased.
The luminous intensity of the blue light emitted more becomes smaller. That is, the luminous intensity of the white light emitted from the white LED 14 and the luminous intensity of the blue light emitted from the blue LED 15 change according to the current amounts of the currents Ia and Ib, respectively. The current amounts of the currents Ia and Ib are independently controlled by a control device (not shown). The control device is FP together with LED drive circuit and LED control circuit.
It is arranged on C41.

FIG. 4 shows the configuration of the white LED 14. The white LED 14 is a single-chip white LED. The white LED 14 is mainly composed of a reflective frame 21, a blue LED 24, and YA.
It is composed of a G (yttrium, aluminum, garnet) phosphor 23.

As the blue LED 24, one that emits blue light having a peak wavelength in the range of 430 nm to 480 nm is used. The blue LED 24 emits blue light when the current Ia flows. Here, if the current amount of the current Ia is increased, the luminous intensity of the blue light emitted from the blue LED 24 is increased, and if the current amount of the current Ia is decreased, the luminous intensity of the blue light emitted from the blue LED 24 is decreased. .

The reflection frame 21 is made of a resin or the like and has a mortar-shaped recess, and a reflection film that reflects light by plating or the like is formed on the inner surface of the recess. Each of the blue LEDs is installed on the bottom surface of the concave portion of the reflection frame 21 and is sealed with a transparent resin 22 mixed with a YAG phosphor 23.

Blue light emitted from the blue LED 24 generates yellow light (dashed arrow Ye in FIG. 4) by exciting the YAG phosphor 23, and light that passes through the resin 22 as it is and is emitted as blue light (FIG. 4 and a solid line arrow B). White LED 14 is resin 2
The white light is generated by mixing the blue light transmitted through 2 as it is and the yellow light emitted when the YAG phosphor 23 is excited. Therefore, the adjustment of the luminous intensity of the white light emitted from the white LED 14 is performed by adjusting the luminous intensity of the blue light emitted from the blue LED 24. In other words, the brightness of white light is adjusted by adjusting the current Ia.

In the illumination device 10 according to the first embodiment, as an example, the blue LE in the white LED 14
Assume that a blue LED that emits blue light having a peak at a wavelength of 450 nm is used as both the D24 and the blue LED 15 used as a single blue LED in the light source unit 12.

FIG. 5 shows spectral distributions of the white light and blue light emitted from the white LED 14 and the blue LED 15, respectively. The horizontal axis indicates the wavelength of light [nm], and the vertical axis indicates the luminous intensity. In FIG. 5, a graph 151 indicated by a broken line indicates a spectral distribution of light emitted from the white LED 14, and a graph 152 indicated by a solid line indicates a spectral distribution of light emitted from the blue LED 15. The white LED 14 emits blue light having a peak at a wavelength of 450 nm.
Since 24 is used, the graph 151 has a peak that peaks at a wavelength of 450 nm. In addition, in the white LED 14, yellow light is emitted when the YAG phosphor 23 is excited, so the graph 151 also has a mountain with a wide skirt that becomes a vertex near the wavelength of 540 nm.

Even in a general white LED that emits white light by mixing blue light and yellow light emitted when the YAG phosphor is excited, the spectral distribution of the white light has a predetermined wavelength of blue light. And a mountain having a wide base with a predetermined wavelength of yellow light as a peak. The blue light emitted from the blue LED has a large energy. Therefore, in a single-chip type white LED, by using a blue LED as a chip, light of other colors emitted when a phosphor such as yellow light is excited can have a high luminous intensity.

In a general white LED, the difference between the luminous intensity of the wavelength that becomes the peak of blue light and the luminous intensity of the wavelength that becomes the apex of yellow light is large. On the other hand, in the white LED 14 according to the first embodiment, as can be seen from FIG. 5, the difference between the luminous intensity of the wavelength that becomes the peak of blue light and the luminous intensity of the wavelength that becomes the apex of yellow light is small. From this, it can be seen that the white light emitted from the white LED 14 according to the first embodiment is more yellowish white light than the white light emitted from a general white LED.

On the other hand, since a blue LED having a wavelength of 450 nm is used as the blue LED 15, the graph 152 is a mountain having a very narrow base having a large luminous intensity peak at a wavelength of 450 nm.

By mixing the yellowish white light emitted from the white LED 14 and the blue light emitted from the blue LED 15, white light is generated, and this white light is used as the light L as the light source unit 12.
More light is emitted.

Here, in the illumination device 10 according to the first embodiment, the reason for using the white LED that emits yellowish white light without using the yellow LED that emits yellow light will be described. The spectral distribution of the yellow light emitted from the yellow LED is a mountain having a very narrow base having a peak at a predetermined wavelength of the yellow light, like the spectral distribution of the light of the blue LED 15 described above.
That is, since the spectrum distribution of the light of the yellow LED does not extend to the wavelength of the red light, even if the light emitted from the yellow LED is transmitted to the red colored layer 6R of the liquid crystal display panel 30,
The red color cannot be displayed. For this reason, the illumination device 10 according to the first embodiment.
Then, white LED is used instead of yellow LED.

FIG. 6 shows an International Commission on Illumination (CIE) xy chromaticity diagram showing chromaticity ranges. Chromaticity range 20
Reference numeral 1 denotes a chromaticity range based on the wavelength sensitivity characteristic of the human eye, which indicates a chromaticity range that can be recognized by humans. R, G, B, and Ye in the figure indicate rough chromaticities of red, green, blue, and yellow. In FIG. 6, the chromaticity point of the blue light (wavelength 450 nm) emitted from the blue LED 15 is indicated by a point S, and the chromaticity point of the YAG phosphor 23 is indicated by a point Q. A straight line 210 is a straight line connecting the point S and the point Q. A chromaticity range 202 indicated by a dashed line indicates a predetermined white area. In the first embodiment, the blue LED 24 in the white LED 14 is the blue LED 15.
Therefore, the chromaticity point of the white light emitted from the white LED 14 is a point V on the straight line 210.

FIG. 7 shows an enlarged view of the chromaticity range 202 of the white region. Specifically, the chromaticity range 202 is defined by four points po1, po2, po3, and po4. In the chromaticity range 202,
The range of the X value is 0.287 to 0.311, and the range of the Y value is 0.276 to 0.315.

In FIG. 7, the chromaticity range 202 is divided into four regions P1 to P4. The region P1 is defined by four points po1, po6, po9, and po5, and the value range of X is 0.291 to 0.302.
, Y ranges from 0.276 to 0.294. The region P2 has four points po6 and po2.
, Po7, and po9, the range of the X value is 0.287 to 0.298, and the range of the Y value is 0.287 to 0.304. The region P3 has four points po5, po9, po8, and po4.
The range of the value of X is 0.298 to 0.311, and the range of the value of Y is 0.282 to 0.00.
305. The region P4 is defined by four points po9, po7, po3, and po8. The value range of X is 0.296 to 0.308, and the value range of Y is 0.294 to 0.315.

Thus, when the chromaticity range 202 is divided into four regions P1 to P4, for example, the region P3,
P4 is closer to Ye in the xy chromaticity diagram of FIG. 6 than regions P1 and P2. Accordingly, white light having chromaticity points in the regions P3 and P4 becomes whiter light that is more yellowish than white light having chromaticity points in the regions P1 and P2. Further, the regions P1 and P2 are more in FIG. 6 than the regions P3 and P4.
It is in the position close to B in the xy chromaticity diagram. Accordingly, the white light having chromaticity points in the regions P1 and P2 becomes whiter lighter than the white light having chromaticity points in the regions P3 and P4. Here, since the light emitted from the white LED 14 becomes yellowish white light, the position of the point V is close to Ye in the chromaticity range 202 as a white region, as shown in FIG.

In the illumination device 10 according to the first embodiment, the white light emitted from the light source unit 12 is white LE.
This is a combined light in which yellowish white light emitted from D14 and blue light emitted from the blue LED 15 are mixed. Therefore, the intensity of white light emitted from the white LED 14 and the blue LED
By adjusting both the luminosity of the blue light emitted from the light source 15, the chromaticity value of the white light emitted from the light source unit 12 is set to a range between the point V and the point S on the straight line 210 shown in FIG. It can be changed with X1. For example, as shown in FIG. 7, the chromaticity point of white light emitted from the light source unit 12 is
It is assumed that it is at the position of the point W. At this time, if the luminous intensity of the blue light emitted from the blue LED 15 is increased, the position of the point W moves in the direction of the arrow a1 along the straight line 210, and the white light emitted from the light source unit 12 is more bluish. It becomes white light. If the luminous intensity of the blue light emitted from the blue LED 15 is lowered, the position of the point W moves in the direction of the arrow a2 along the straight line 210, and the white light emitted from the light source unit 12 is more yellowish white. Become light. On the other hand, white LED14
If the luminous intensity of the white light emitted from the light source is increased, the position of the point W moves in the direction of the arrow a2 along the straight line 210, and the white light emitted from the light source unit 12 is converted into white light with a more yellowish color. Become.
If the luminous intensity of the white light emitted from the white LED 14 is lowered, the position of the point W moves in the direction of the arrow a1 along the straight line 210, and the white light emitted from the light source unit 12 is more bluish white light. Become.

As can be seen from this, the luminous intensity of the white light emitted from the white LED 14, the blue LED
15 by adjusting both the luminous intensity of the blue light emitted from the line 15
Thus, the chromaticity of the predetermined white light can be adjusted, that is, the white balance of the white light emitted from the light source unit 12 can be adjusted.

The position of the point V, which is the chromaticity point of the white light emitted from the white LED 14, is determined mainly by the amount of the YAG phosphor 23 contained in the resin 22. Specifically, as the amount of YAG phosphor 23 contained in the resin 22 increases, the amount of blue light that is converted into yellow light also increases. Therefore, the position of the point V is as shown by the broken line arrow b2 in FIG. And move closer to Ye. On the other hand, if the amount of the YAG phosphor 23 contained in the resin 22 is reduced, the amount of blue light converted into yellow light is also reduced. Therefore, the position of the point V is B B as shown by the broken line arrow b1 in FIG. Move to a closer position. Accordingly, if the amount of the YAG phosphor 23 contained in the resin 22 is increased, the straight line 21
The range X1 between the point V and the point S on 0 can be further expanded. That is, the adjustable range of the white balance of the white light emitted from the light source unit 12 can be widened.

Some general lighting devices generate white light using LEDs of RGB colors. In such an illuminating device, it is necessary to adjust the amount of current that flows through LEDs of three different RGB colors having different properties, whereas the illuminating device 10 according to the first embodiment is used as a chip. It is only necessary to adjust the amount of current flowing through one type of blue LED. Therefore, R
Compared with a general lighting device in which LEDs of each color of GB are used, the lighting device 10 according to the first embodiment can easily generate white light.

Further, in a general lighting device in which LEDs of each color of RGB are used, the luminous intensity of each color LED also changes due to a temperature change or a change with time, and the characteristics of the change differ depending on the LED of each color. Therefore, if the amount of current flowing through each color LED is kept at the current amount set at the time of product shipment, the intensity of the light emitted from each color LED will change due to temperature change or change over time. Even if the light emitted from the LEDs of the respective colors is mixed, the white light is not the same as the initially set white light. For example, when the temperature rises, a blue LED has a property of becoming bright and a red LED has a property of becoming dark. Therefore, in a place where the temperature is high, the white color displayed on the display screen of the liquid crystal display panel becomes a bluish white color. Also,
Of the RGB LEDs, the blue LED has the fastest deterioration and darkens over time, while the red LED has the slowest deterioration. Therefore, as time passes, the white color displayed on the display screen of the liquid crystal display panel becomes reddish white.

In the illumination device 10 according to the first embodiment, as described above, the white LED 14, the blue LE
Since only one type of blue LED is used for D15, white LED 14, blue LED 1
The change in the luminous intensity of the light due to the temperature change of 5 and the change over time changes at the same rate. Therefore, as compared with the illumination device 10 that generates white light by mixing LEDs of RGB colors as described above, the illumination device 10 according to the first embodiment has a white balance of white light due to a temperature change or a change over time. Can be gradual.

(Adjusting the white balance of white light)
As a method of adjusting the white balance of the white light emitted from the light source unit 12, a method of adjusting the white balance of the white light immediately after emitted from the illumination device 10, and the liquid crystal display panel 3
Two methods of adjusting the white balance of white light after passing through 0 can be considered.

FIG. 8 shows a flowchart of a manufacturing method of the liquid crystal display device 100 in the case of adjusting the white balance of white light immediately after the light is emitted from the illumination device 10, and FIG. 9 adjusts the white balance of white light transmitted through the liquid crystal display panel 30. The flowchart of the manufacturing method of the liquid crystal display device 100 in the case of doing is shown.

When adjusting the white balance of the white light immediately after the light is emitted from the lighting device 10, as shown in FIG. 8, first, the lighting device 10 that is the lighting device manufacturing process is manufactured (step S11).
The liquid crystal display panel 30 which is a display panel manufacturing process is manufactured (step S12). afterwards,
As the luminous intensity adjusting step, the white LED 1 is adjusted by adjusting the currents Ia and Ib flowing through the white LED 14 and the blue LED 15 while observing the chromaticity of the white light immediately after the light is emitted from the lighting device 10.
4. Change the intensity of both the white light emitted from 4 and the blue light emitted from the blue LED 15.
The white balance of the white light immediately after being emitted from the illumination device 10 is adjusted (step S13).
). After the adjustment of the white balance, the liquid crystal display device 100 is completed by combining the illumination device 10 and the liquid crystal display panel 30 as a combination process (step S14).

On the other hand, when white light is generated by adjusting the light transmitted through the liquid crystal display panel 30, FIG.
As shown in FIG. 3, the illumination device 10 that is the illumination device production process is produced (step S21), and the liquid crystal display panel 30 that is the display panel production process is produced (step S22). Thereafter, as a combination process, the lighting device 10 and the liquid crystal display panel 30 are combined (step S2).
3). After completing the device configuration of the liquid crystal display device 100 in this way, as a luminous intensity adjustment step, while observing the chromaticity of white light transmitted through the liquid crystal display panel 30 and emitting light, a white LED
14. By adjusting the currents Ia and Ib flowing through the blue LED 15, the intensity of both the white light emitted from the white LED 14 and the blue light emitted from the blue LED 15 is changed, and the white light emitted from the liquid crystal display panel White balance is adjusted (step S24).

The white balance of white light can be adjusted during the manufacturing process of the liquid crystal display device 100 by the two manufacturing methods of the liquid crystal display device 100 described above.

In a liquid crystal display device having a general RGB colored layer, the light transmittance of the colored layer in the liquid crystal display panel varies depending on the thickness of the colored layer, etc., so that the light emitted from the LED passes through the colored layer. As a result, the light intensity of each color of RGB changes. Therefore, even if predetermined white light is generated on the lighting device side, the color of the white light after passing through the colored layer 6 is not always the same as the color of the predetermined white light. In other words, when white display is performed on the display screen, the white color visually recognized by the observer is not always the same as the color of the predetermined white light generated on the lighting device side. In this way, since the ratio of the light intensity of each color of RGB constituting the white light changes depending on the transmittance of the colored layer, the observer can select the white color displayed on the display screen and the predetermined light generated on the lighting device side. It looks different from the color of white light. In particular, among the light of each color of RGB, since the blue light is absorbed most by the colored layer, the blue light component in the white light is insufficient. When white display is performed on the liquid crystal display panel 30 having the RGBC colored layer 6 as in the liquid crystal display device 100 according to the present embodiment, the liquid crystal display panel having the RGB colored layer described above is used. The white point tends to shift more to the green side by adding the C colored layer 6 than when performing white display.

Thus, the chromaticity is different between the white light projected on the display screen after passing through the liquid crystal display panel 30 and the white light generated by the illumination device 10. Therefore, it is more effective to adjust the white balance of the white light displayed on the display screen that is actually visually recognized by the observer.
More appropriate white display can be performed than adjusting the white balance of white light immediately after the light is emitted.

In the illuminating device 10 which concerns on 1st Embodiment, blue LED24 of white LED14, blue LED
15 can adjust the luminous intensity of the blue light emitted respectively. In other words, when the blue light component of white light that is absorbed by the liquid crystal display panel is insufficient, the blue light component can be supplemented. Further, by using the illumination device 10 for the liquid crystal display panel 30 having the RGBC colored layer 6 as in the liquid crystal display device 100 according to the present embodiment, the blue light component of white light can be increased. The white point of white light shifted to the green side can be adjusted to the optimum white point.

(Modification of the first embodiment)
In the illuminating device 10 which concerns on 1st Embodiment mentioned above, blue LED15 and white LED1
The blue LEDs 24 in FIG. 4 are both blue LEDs that emit blue light having a peak at a wavelength of 450 nm. However, the present invention is not limited to this, and instead, both blue lights having peaks at different wavelengths are used. A blue LED that emits light may be used.

In the modification of the lighting device according to the first embodiment, in the configuration of the lighting device 10 shown in FIG.
As an example, a blue LED that emits blue light having a peak at a wavelength of 460 nm is used as the blue LED 15, and a wavelength 4 is used as the blue LED 24 in the white LED 14.
It is assumed that a blue LED that emits blue light having a peak at 50 nm is used. FIG. 10 is an XY chromaticity diagram of the International Lighting Commission (CIE) showing the chromaticity range shown in FIG.
The chromaticity point at a wavelength of 460 nm is indicated by a point P. The straight line 210a is a straight line connecting the point V and the point P.

FIG. 11 shows an enlarged view of the chromaticity range 202. In the case of the modified example, the point W is a straight line 2 shown in FIG.
It can be changed in the range X1a between the point V and the point P on 10a. Specifically, in FIG. 11, if the luminous intensity of the blue light emitted from the blue LED 15 is increased, the position of the point W becomes a straight line 210a.
The white light that moves in the direction of the arrow aa <b> 1 and emits light from the light source unit 12 becomes more bluish white light. If the luminous intensity of the white light emitted from the white LED 14 is increased, the position of the point W moves in the direction of the arrow aa2 along the straight line 210a, and the white light emitted from the light source unit 12 is more yellowish white. Become light.

As described above, even if the blue light emitted from the blue LED 15 and the blue LED 24 in the white LED 14 has peaks at different wavelengths, the white LED 14 is the same as described in the first embodiment. By adjusting both the luminous intensity of the white light emitted from the blue LED 15 and the luminous intensity of the blue light emitted from the blue LED 15, the white balance of the white light emitted from the light source unit 12 can be adjusted.

[Second Embodiment]
Next, the illuminating device 10a which concerns on 2nd Embodiment is demonstrated. In FIG. 12, the top view of the illuminating device 10a which concerns on 2nd Embodiment is shown. As illustrated in FIG. 3, the lighting device 10 according to the first embodiment has a configuration in which the white LED 14 and the blue LED 15 are arranged in the light source unit 12, but the lighting device 10 a according to the second embodiment is illustrated in FIG. 12. As shown in FIG. 4, in addition to the configuration of the illumination device 10 according to the first embodiment, the white LED 16 is further arranged in the light source unit 12. The light L emitted from the light source unit 12 is the white light emitted from the white LEDs 14 and 16 and the blue LED.
15 is a composite light in which the blue light emitted from 15 is mixed.

FIG. 13 shows the configuration of the white LEDs 14 and 16. As shown in FIG. 13, the white LED 16
Has the same configuration as that of the white LED 14, mainly the reflective frame 21 and the blue LED 25.
And a YAG (yttrium, aluminum, garnet) phosphor 23.
The ratio of the amount of the YAG phosphor 23 to the resin 22 in the white LED 16 is white LE.
The ratio of the amount of the YAG phosphor 23 to the resin 22 in D14 is the same. White L
The blue LED 25 in the ED 16 emits blue light when the current Ic flows, and the intensity of the white light changes according to the amount of current Ic. The amount of current Ic is also the current Ia
, And Ib, they are independently controlled by a control device (not shown). The adjustment of the luminous intensity of the white light emitted from the white LED 16 is also performed by adjusting the luminous intensity of the blue light emitted from the blue LED 25, similarly to the white LED 14. In other words, the brightness of white light is adjusted by adjusting the current Ic. The blue LED 25 also has a wavelength of 430 nm to 480 nm.
Those emitting blue light having a peak in the wavelength range are used. However, blue LED
25 emits blue light having a peak at a wavelength different from the wavelength of the blue light emitted from the blue LED 24 in the white LED 14. In the illumination device 10a, as an example, a white LED
As the blue LED 25 in FIG. 16, one that emits blue light having a peak at a wavelength of 460 nm is used.

FIG. 14 is a graph 151, 152 of the spectral distribution of the white light emitted from the white LED 14 and the blue LED 15 shown in FIG. 5, and a graph 153 of the spectral distribution of the white light emitted from the white LED 16. It is a graph of the added spectrum distribution. White LE
In D16, since the blue LED 25 that emits blue light having a wavelength of 460 nm is used, the graph 153 has a peak that peaks at a wavelength of 460 nm. Also,
In the white LED 16, yellow light is emitted when the YAG phosphor 23 is excited, so that the graph 153 also has a mountain with a wide base at the top in the vicinity of a wavelength of 540 nm, similar to the graph 151. As can be seen from the graph 153, the light emitted from the white LED 16 is similar to the light emitted from the white LED 14 as compared with a general white LED. The difference in luminous intensity at the wavelength at the apex is small.
Therefore, the light emitted from the white LED 16 is also yellowish white light.

FIG. 15 shows the XY chromaticity diagram of the International Commission on Illumination (CIE) showing the chromaticity range of FIG. A straight line 211 is a straight line connecting the point P and the point Q. The point Z on the straight line 211 is the white LED 1
6 is a chromaticity point of white light emitted from 6.

FIG. 16 shows an enlarged view of the chromaticity range 202. The white LED 16 has the same configuration as the white LED 14, and the ratio of the amount of the YAG phosphor 23 to the resin 22 is the same as the ratio of the amount of the YAG phosphor 23 to the resin 22 in the white LED 14. The position of the point Z on the straight line 211 is also a value determined mainly by the amount of the YAG phosphor 23 contained in the resin 22. Therefore, as shown in FIG. 16, the point Z is located on the straight line 211 and closest to the point V.

In FIG. 16, regions P2 and P4 are located closer to G in the xy chromaticity diagram of FIG. 6 than regions P1 and P3. Therefore, the white light having chromaticity points in the regions P2 and P4 is
The white light is more green than the white light having the chromaticity point 3. The regions P1 and P3 are closer to R in the xy chromaticity diagram of FIG. 6 than the regions P2 and P4. Therefore, the region P1,
White light having a chromaticity point in P3 becomes white light reddish than white light having chromaticity points in regions P2 and P4.

In the illumination device 10a according to the second embodiment, the white light emitted from the light source unit 12 is white L
Yellowish white light emitted from the EDs 14 and 16 and blue light emitted from the blue LED 15 are mixed. Accordingly, by adjusting both the luminous intensity of the white light emitted from the white LED 14 and the luminous intensity of the white light emitted from the white LED 16, the chromaticity value of the white light emitted from the light source unit 12 is shown in FIG. It can be changed in the range Y1 between the point Z and the point V shown in FIG. For example, the chromaticity point of white light emitted from the light source unit 12 is a point W as shown in FIG.
Suppose that At this time, if the luminous intensity of the white light emitted from the white LED 16 is increased, the position of the point W moves in the direction of the arrow c1, and the white light emitted from the light source unit 12 becomes white light with more greenishness. . If the luminous intensity of the white light emitted from the white LED 14 is increased, the position of the point W moves in the direction of the arrow c2, and the white light emitted from the light source unit 12 becomes more reddish white light. As can be seen from this, by adjusting both the luminous intensity of the white light emitted from the white LED 14 and the luminous intensity of the white light emitted from the blue LED 16, the arrow c1 is adjusted.
, The white balance of white light in the c2 direction can be adjusted.

As can be seen from FIG. 16, the chromaticity values of the white light emitted from the light source unit 12 are represented by points Z and V.
The Y coordinate of the chromaticity point of the point W is mainly determined by changing in the range Y1 between. In other words, it is possible to adjust the white balance in the Y-axis direction for the white light emitted from the light source unit 12 by adjusting both the luminous intensity of the white light emitted from the white LEDs 14 and 16, respectively. .

Further, as described above, the luminous intensity of the blue light emitted from the blue LED 15 and the white LED
By adjusting both the luminous intensity of the white light emitted from 14, the white balance can be adjusted in the directions of arrows a1 and a2. The X coordinate of the point W is mainly determined by the position on the straight line 210. In other words, the light source unit 12 is adjusted by adjusting both the luminous intensity of the white light emitted from the white LED 14 and the luminous intensity of the blue light emitted from the blue LED 15.
It is possible to adjust the white balance in the X-axis direction for the white light emitted more.

As can be seen from the above, in the illuminating device 10a according to the second embodiment, the white light emitted from the light source unit 12 is adjusted by adjusting all of the white LEDs 14 and 16 and the blue LED 15 in the X-axis direction, Y White balance can be adjusted in the axial direction. Accordingly, the lighting device 10a according to the second embodiment can adjust the white balance over a wider range than the lighting device 10 according to the first embodiment.

Moreover, also in the illuminating device 10a which concerns on 2nd Embodiment, the illuminating device 1 which concerns on 1st Embodiment.
Similarly to 0a, when adjusting the white balance, it is only necessary to adjust the amount of current flowing through one type of blue LED used as a chip. Therefore, as compared with a general lighting device in which LEDs of RGB colors are used, the lighting device 10a according to the second embodiment can easily emit white light similarly to the lighting device 10 according to the first embodiment. Can be generated. In addition, in the illumination device 10a according to the second embodiment, the temperature change is similar to the illumination device 10 according to the first embodiment, as compared with the illumination device that generates white light by mixing LEDs of RGB colors. In addition, it is possible to make the white balance of white light collapse gradually due to changes over time.

(Modification of the second embodiment)
Next, a modification of the illumination device 10a according to the second embodiment will be described. FIG. 17 is a diagram illustrating a white LED 13 according to a modification of the illumination device 10a according to the second embodiment. In the illuminating device 10a according to the second embodiment, the blue LEDs 15 and the white LEDs 14 and 16 are arranged in the light source unit 12, but the present invention is not limited thereto. Instead of arranging the white LEDs 14 and 16 in the light source unit 12, the white LEDs 13 shown in FIG. 17 may be arranged. In the white LED 13, both the blue LEDs 24 and 25 are installed on the bottom surface of the concave portion of one reflection frame body 21, and Y
It has a structure in which it is sealed with a transparent resin 22 mixed with an AG phosphor 23. The blue LEDs 24 and 25 emit blue light by flowing currents Ia and Ic, respectively.
The current amounts of the currents Ia and Ic are independently controlled by a control device (not shown). Blue LE
The blue light emitted from D24 and 25 generates yellow light (broken arrow Ye in FIG. 17) by exciting the YAG phosphor 23, and light that passes through the resin 22 as it is and emits as blue light ( It is divided into a solid arrow B) in FIG. White LED 13 is resin 2
The white light is generated by mixing the blue light transmitted through 2 as it is and the yellow light emitted when the YAG phosphor 23 is excited. As described above, the white LED 13 can also adjust the white balance in the Y-axis direction with respect to the white light emitted from the light source unit 12, and further, by combining with the blue LED 14, the X-axis and Y-axis can be adjusted. The white balance of the direction can be adjusted.

[Application example]
The light source part 12 of the illuminating device 10 which concerns on 1st Embodiment, and the illuminating device 10a which concerns on 2nd Embodiment.
The light-emitting elements arranged in are not limited to the blue LED and the white LED as described above. Instead of blue LEDs, organic EL light-emitting elements (electrolumines) that can emit blue light
luminescence), instead of the white LED, an organic EL light emitting element capable of emitting white light by exciting the phosphor may be used. In the first embodiment and the second embodiment,
Although a liquid crystal display panel is used as the display panel, the present invention is not limited to this, and another display panel such as an electrophoretic display panel may be used instead.

[Electronics]
Next, a specific example of an electronic apparatus to which the liquid crystal display device 100 according to this embodiment can be applied will be described with reference to FIG.

First, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 18A is a perspective view showing the configuration of this personal computer. As shown in the figure, a personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display device 100 according to the present invention is applied.

Next, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 18B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the mobile phone 720 includes a plurality of operation buttons 721, an earpiece 722, a mouthpiece 72.
3 and a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied.

As an electronic apparatus to which the liquid crystal display device 100 according to the present invention can be applied, FIG.
In addition to the personal computer shown in FIG. 18 and the cellular phone shown in FIG. 18B, a liquid crystal television, a viewfinder type / monitor direct-view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a work Station, video phone,
A POS terminal, a digital still camera, etc. are mentioned.

1 is a plan view of a liquid crystal display device according to a first embodiment. 1 is a cross-sectional view of a liquid crystal display device according to a first embodiment. The top view of the illuminating device which concerns on 1st Embodiment. The schematic diagram which shows the structure of white LED which concerns on 1st Embodiment. The spectral distribution of the white light emitted from the illuminating device which concerns on 1st Embodiment. International Commission on Illumination (CIE) xy chromaticity diagram showing chromaticity range. The enlarged view of the chromaticity range of a white area | region. The flowchart of the manufacturing method of a liquid crystal display device. The flowchart of the manufacturing method of a liquid crystal display device. International Commission on Illumination (CIE) xy chromaticity diagram showing chromaticity range. The enlarged view of the chromaticity range of a white area | region. The top view of the illuminating device which concerns on 2nd Embodiment. The schematic diagram which shows the structure of white LED which concerns on 2nd Embodiment. The spectral distribution of the white light emitted from the illuminating device which concerns on 2nd Embodiment. International Commission on Illumination (CIE) xy chromaticity diagram showing chromaticity range. The enlarged view of the chromaticity range of a white area | region. The schematic diagram which shows the modification of the illuminating device which concerns on 2nd Embodiment. FIG. 11 is a diagram showing an example of an electronic apparatus to which the liquid crystal display device of this embodiment is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Light guide plate, 12 ... Light source part as a light-emitting device, 14 ... White L as 1st light emission means
ED, 15 ... Blue LED as second light emitting means, 16 ... White L as third light emitting means
ED, 23... YAG phosphor as blue light wavelength converting means, 10, 10a.
DESCRIPTION OF SYMBOLS 0 ... Liquid crystal display panel as a display panel, 100 ... Liquid crystal display device as an electro-optical device.

Claims (19)

A lighting device comprising a light emitting device,
The light emitting device
First light emitting means for emitting first blue light having a peak at a predetermined wavelength;
Blue light wavelength conversion means for converting a part of the first blue light into yellow light;
A second light emitting second blue light emitted by a light emitting means different from the first blue light;
A light emitting means,
The intensity of the first blue light and the intensity of the second blue light are set so that the white light, which is the combined light of the first blue light, the second blue light, and the yellow light, has a predetermined chromaticity. An illumination device characterized in that both luminosities are adjusted. The light emitting device
And a third light emitting means for emitting a third blue light having a wavelength different from a peak wavelength of the first blue light. The blue light wavelength converting means comprises the first blue light wavelength converting means. Converting a portion of light and a portion of the third blue light into yellow light;
The luminous intensity of the first blue light so that the white light, which is the combined light of the first blue light, the second blue light, the third blue light, and the yellow light, has a predetermined chromaticity. 2. The lighting device according to claim 1, wherein the luminous intensity of the second blue light and the luminous intensity of the third blue light are all adjusted. 3. The lighting device according to claim 1, wherein the first blue light and the second blue light have a peak wavelength within a wavelength range of 430 nm to 480 nm. The lighting device according to any one of claims 1 to 3,
An electro-optical device comprising: a display panel illuminated by the illumination device. First light emitting means for emitting first blue light having a peak at a predetermined wavelength;
Blue light wavelength conversion means for converting a part of the first blue light into yellow light;
A second light emitting second blue light emitted by a light emitting means different from the first blue light;
A light emitting means,
The intensity of the first blue light and the intensity of the second blue light are set so that the white light, which is the combined light of the first blue light, the second blue light, and the yellow light, has a predetermined chromaticity. A lighting device in which both the luminous intensity is adjusted;
A display panel including a plurality of display pixels on which light emitted from the illumination device is incident;
One display pixel of the display panel includes a plurality of sub-pixels, and the sub-pixels include a blue-based hue coloring region and a red-based hue out of a visible light region whose hue changes according to a wavelength. An electro-optical device comprising: a colored region, or any one of four colored regions composed of colored regions of two hues selected from hues from blue to yellow. 6. The electro-optical device according to claim 5, wherein one of the colored regions of the two hues selected from the hues of blue to yellow has a hue of blue to green. 6. The electro-optical device according to claim 5, wherein the other colored region of the colored regions of the two hues selected from the hues of blue to yellow is a green to orange hue. First light emitting means for emitting first blue light having a peak at a predetermined wavelength;
Blue light wavelength conversion means for converting a part of the first blue light into yellow light;
A second light emitting second blue light emitted by a light emitting means different from the first blue light;
A light emitting means,
The intensity of the first blue light and the intensity of the second blue light are set so that the white light, which is the combined light of the first blue light, the second blue light, and the yellow light, has a predetermined chromaticity. A lighting device in which both the luminous intensity is adjusted;
A display panel including a plurality of display pixels on which light emitted from the illumination device is incident;
One display pixel of the display panel includes a plurality of sub-pixels, and the sub-pixels include a first colored region having a transmitted light wavelength peak of 415 to 500 nm and a second colored region of 600 nm or more. And a third colored region in the range of 485 to 535 nm and a fourth colored region in the range of 500 to 590 nm, and the light emitted from the illumination device is An electro-optical device that emits white light when transmitted through a colored region of a seed. The electro-optical device according to claim 8, wherein the wavelength peak of the transmitted light of the third colored region is in a range of 495 to 520 nm. The electro-optical device according to claim 8, wherein a peak of a wavelength of transmitted light of the fourth colored region is 510 to 585 nm. A first light emitting means for emitting first blue light having a peak at a predetermined wavelength; a blue light wavelength converting means for converting a part of the first blue light into yellow light; and the first blue light. A second light emitting means for emitting a second blue light emitted by a light emitting means different from the light emitting means, and a lighting device comprising:
A display panel that includes a plurality of display pixels and on which light emitted from the illumination device is incident;
The display pixel includes a plurality of sub-pixels, and the sub-pixel includes any one of red, green, blue, and cyan colored layers. An electronic apparatus comprising the electro-optical device according to claim 4 in a display unit. First light emitting means for emitting first blue light having a peak at a predetermined wavelength;
Blue light wavelength conversion means for converting a part of the first blue light into yellow light;
A second light emitting second blue light emitted by a light emitting means different from the first blue light;
A light-emitting device. Two light emitting means for emitting two blue lights respectively, and one of the two blue lights
A blue light wavelength converting means for converting a part of the blue light into yellow light, and a method of manufacturing an electro-optical device including a light emitting device,
A lighting device manufacturing step of manufacturing a lighting device having the light emitting device;
A display panel manufacturing process for manufacturing a display panel;
A combination step of combining the lighting device and the display panel;
And a luminous intensity adjusting step of adjusting both luminous intensity of the two blue lights. The luminous intensity adjusting step is performed before the combining step, and the white balance is adjusted by adjusting both luminous intensities of the two blue lights based on the light emitted from the lighting device. The method of manufacturing an electro-optical device according to claim 14. The luminous intensity adjusting step is performed after the combining step, and the white balance is adjusted by adjusting both luminous intensities of the two blue lights based on the light emitted from the display panel. The method of manufacturing an electro-optical device according to claim 14. The display panel includes a plurality of display pixels,
Each of the display pixels is selected from a blue hue coloring area, a red hue coloring area, and a hue from blue to yellow among visible light areas whose hue changes according to wavelength. 17. The method of manufacturing an electro-optical device according to claim 16, wherein the electro-optical device is composed of sub-pixels of each color in a colored region of a seed hue. The display panel includes a plurality of display pixels,
Each of the display pixels has a first colored region having a transmitted light wavelength peak of 415 to 500 nm, a second colored region of 600 nm or more, a third colored region of 485 to 535 nm, and 500 to 590 nm. 17. The method of manufacturing an electro-optical device according to claim 16, wherein each of the sub-pixels of each color of the fourth coloring region is provided. The display panel includes a plurality of display pixels,
17. The method of manufacturing an electro-optical device according to claim 16, wherein each of the display pixels includes sub-pixels of red, green, blue, and cyan colors.

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