JP2014035456A - Display switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display switching device which can switch first and second display to white display.SOLUTION: A display switching device 1 is provided with: first light sources 2, 4 for emitting at least first color light and second color light that can be mixed with white light; second light sources 3, 5 for emitting at least third color light and fourth color light that can be mixed with white light; a first color filter 21 for transmitting light emitted from the first light source 2, 4; and a second color filter 22 for transmitting light emitted from the second light sources 3, 5. By switching the first and second light sources 2 to 5 and emitting light, the first white display 1 is performed by a combination of the first light sources 2, 4 and the first color filter 21, and second white display is performed by a combination of the second light sources 3, 5 and the second color filter 22.

Description

  The present invention relates to a display switching device, and more particularly to a display switching device that can switch between two white display.

  A variable display structure has been proposed in which different first and second displays are displayed on the same display surface (for example, see Patent Document 1).

  The variable display structure described in Patent Document 1 is a fluorescent light in which a blue light source, a blue printing portion, and two blue and yellow phosphors are mixed by switching between a blue light source and a red light source for projection. The first white display is performed by the combination with the filter, and the second red display is performed by the combination of the light from the red light source and the red printing portion.

JP 2007-293253 A

  The conventional variable display structure described in Patent Document 1 can switch between the first display and the second display, but switches the first display and the second display to a white display. I can't. In this conventional variable display structure, only the first display is switched to white display, and the first and second displays are not switched to white display.

  An object of the present invention is to provide a display switching device that can switch a first display and a second display to a white display.

[1] The present invention provides a first light source that emits at least a first color light and a second color light that can be mixed with white light, and a first light source that emits at least a third color light and a fourth color light that can be mixed with white light. 2 light sources, a first color filter that transmits light emitted from the first light source, and a second color filter that transmits light emitted from the second light source. By switching the second light source to emit light, a first white display is performed by a combination of the first light source and the first color filter, and the second light source and the second color filter A display switching device is characterized in that the second white display is performed in combination.

[2] In the first color filter according to [1], a colored layer that transmits the first color light and the second color light that is complementary to the first color light is provided adjacently, The second color filter is characterized in that a colored layer that transmits the third color light and the fourth color light complementary to the third color light is provided adjacent to the second color filter.

[3] The first color light described in [1] or [2] is light in a blue wavelength band, and the second color light is light in a yellow wavelength band, and the third color light is Is light in the green wavelength band, and the fourth color light is light in the red wavelength band.

  According to the present invention, white and white switching display can be performed.

It is a figure for demonstrating an example of the display switching apparatus which concerns on the suitable 1st Embodiment of this invention, (a) is a plane schematic diagram seen from the surface side, (b) is a cross-sectional schematic diagram. It is a chromaticity diagram showing the definition of complementary colors. 2A and 2B are schematic plan views (a) and (b) showing a pixel configuration of a color filter suitable for the display switching device according to the first embodiment. It is a figure for demonstrating the 1st white display of the display switching apparatus which concerns on 1st Embodiment, (a) is a plane schematic diagram seen from the surface side, (b) is a cross-sectional schematic diagram. It is a figure for demonstrating the 2nd white display of the display switching apparatus which concerns on 1st Embodiment, (a) is a plane schematic diagram seen from the surface side, (b) is a cross-sectional schematic diagram. It is a figure which shows the emission spectrum of the blue, yellow, green, and red LED light source suitable for the display switching apparatus which concerns on 1st Embodiment. It is a figure which shows the transmittance | permeability characteristic of the color filter suitable for the display switching apparatus which concerns on 1st Embodiment with the emission spectrum of a blue and yellow LED light source. It is a figure which shows the transmittance | permeability characteristic of the color filter suitable for the display switching apparatus which concerns on 1st Embodiment with the emission spectrum of a green and red LED light source. It is a figure for demonstrating an example of the display switching apparatus which concerns on 2nd Embodiment, (a) is a plane schematic diagram seen from the surface side, (b) is a cross-sectional schematic diagram. It is a cross-sectional schematic diagram for demonstrating the modification of a display switching apparatus.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. In the figure according to this embodiment, the ratio of each component constituting the display switching device is not limited to the illustrated example.

[First Embodiment]
(Overall configuration of display switching device)
In FIGS. 1A and 1B, reference numeral 1 indicating the whole indicates a configuration example of a typical display switching device according to this embodiment. The display switching device 1 is not particularly defined, but is preferably used for, for example, a lighting device for a meter or a switch mounted on various vehicles.

  As shown in FIGS. 1A and 1B, the display switching device 1 includes first to fourth lights that emit blue (B), green (G), yellow (Y), and red (R) in a single color. The four LEDs 2 to 5 are provided as light sources (hereinafter also referred to as “blue LED 2”, “green LED 3”, “yellow LED 4”, and “red LED 5”).

  As shown in FIGS. 1 (a) and 1 (b), the display switching device 1 emits and extinguishes light by a first light source 6 including two types of blue LED 2 and yellow LED 4 as a set, and green LED 3 and red LED. Light emission and extinction are performed by a second light source 7 in which two types of LEDs 5 are another set.

  When the first light source 6 and the second light source 7 emit light individually, two white designs for the first white display and the second white display are displayed on the same display surface. Switching between the first and second light sources 6 and 7 is performed by control of a control unit provided in the display switching device 1 or control of an external device.

  As shown in FIGS. 1A and 1B, the display switching device 1 according to the first embodiment is configured to display the first white display and the second light source 7 with respect to the first light source 6 and the second light source 7, respectively. The color filter 20 for displaying two white displays has a main part in a structure for switching between the first white display and the second white display.

  The color filter 20 is laminated and integrated with the base material 8 as shown in FIGS. This base material 8 consists of a transparent base material of film shape, sheet shape, or plate shape, such as a polycarbonate-type resin, for example.

  In the chromaticity diagram based on the definition of complementary colors of the International Commission on Illumination (CIE), blue B and yellow Y are on both sides of a straight line passing through the white region near the chromaticity point W1 of white W as shown in FIG. , Green G and red R are on both sides of a straight line passing through a white region near the chromaticity point W1 of white W. Each of the blue B and yellow Y, and the green G and red R are in a complementary color relationship, and are colors that become white W when mixed. A color filter 20 having a complementary color is used.

(Filter configuration)
As shown in FIGS. 1A, 1 </ b> B, and 3, the color filter 20 includes a color filter that includes a first filter 21 and a second filter 22. The color filter 20 includes a third filter 23 that conceals the color. The material of the filters 21 to 23 is not particularly specified, and for example, a colored resin composition containing a general coloring material can be used.

  As shown in FIG. 1A, FIG. 1B, and FIG. 3, the first filter 21 is a color filter that transmits two colors of blue B and yellow Y that are in a complementary color relationship. Corresponding to the region S1, a blue filter layer 21a that transmits blue light and a yellow filter layer 21b that transmits yellow light are formed in a grid-like colored pattern in which they are alternately arranged in the vertical and horizontal directions.

  The first transmissive region S1 is a first white display that serves as a design portion such as a character, number, figure, symbol, or design. A combination of the first filter 21 and the first light source 6 constitutes a first white generation unit that generates first white light.

  One second filter 22 is a color filter that transmits two colors of green G and red R, which are complementary colors, as shown in FIGS. 1A, 1B, and 3. Corresponding to the transmission region S2, a green filter layer 22a that transmits green light and a red filter layer 22b that transmits red light are formed in a grid-like colored pattern in which the filter layers are alternately arranged in the vertical and horizontal directions.

  The second transmissive region S2 is a second white display that serves as a design portion such as a character, number, figure, symbol, or pattern. A combination of the second filter 22 and the second light source 7 constitutes a second white generation unit that generates second white light.

  Since the filter layers 21a, 21b, 22a, and 22b of the respective colors are disposed adjacent to each other, the blue filter layer 21a and the yellow filter layer 21b that have a complementary color relationship, and the green filter layer 22a and the red filter layer 22b. Blue B and yellow Y light, and green G and red R can be mixed sufficiently.

  The filter layers 21a, 21b, 22a, and 22b for each color are formed in a vertical and horizontal grid pattern. However, the filter layers 21a, 21b, 22a, and 22b are particularly defined as long as they are colored pattern shapes that can extract desired two colors without uneven brightness. is not. As another example of the colored pattern, for example, various colored patterns such as a stripe shape or a mesh shape configured by a combination of a linear shape or a curved shape such as vertical, horizontal, or diagonal can be used.

  The portion where the first transmission region S1 and the second transmission region S2 overlap, as shown in FIGS. 1A and 1B, transmits both the light emission of the first light source 6 and the light emission of the second light source 7. The third transmission region S3 is an overlapping portion of the first white display and the second white display. The third transmission region S3 may be a transparent filter that is not colored, or may be a portion where a white print filter may be formed. However, when white printing is performed, there is a concern that a luminance difference may occur at the boundary of a design portion such as a mark. Therefore, as shown in FIG. 10, the top of the first transmission region S1 and the second transmission region S2 It is necessary to provide the diffusion layer 11 on the surface.

  The third filter 23 is a concealing layer that shields both the light emitted from the first light source 6 and the light emitted from the second light source 7. The concealing layer corresponds to the areas other than the first and second transmissive areas S1 and S2, and includes a first transmissive area S1 serving as a first white display, a second transmissive area S2 serving as a second white display, and white light. It becomes the part that absorbs.

(First white display)
The first white display is displayed by causing the first light source 6 to emit light and the second light source 7 to be extinguished. When the blue B and yellow Y light emitted from the first light source 6 is incident on the blue filter layer 21a and the yellow filter layer 21b from the back side of the first filter 21, as shown in FIG. 4A. Each of the incident blue light and yellow light passes through the substrate 8.

  In the process of passing the blue light and the yellow light, the blue light and the yellow light are synthesized inside the substrate 8 and diffused uniformly. A pseudo white light W is generated by the mixed color of the blue light and the yellow light. The white light W is emitted from the base material 8 toward the outside.

(Second white display)
As shown in FIG. 4B, the second white display is displayed by quenching the first light source 6 and causing the second light source 7 to emit light. When the green G and red R light emitted from the second light source 7 is incident on the green filter layer 22a and the red filter layer 22b from the back side of the second filter 22, the incident green light and red light are respectively Through the substrate 8.

  In the process of passing the green light and the red light, the green light and the red light are synthesized inside the substrate 8 and diffused uniformly. A pseudo white light W is generated by the color mixture of the green light and the red light. The white light W is emitted from the base material 8 toward the outside.

(Relation between transmission spectrum and emission spectrum)
In the chromaticity diagram shown in FIG. 2, the chromaticity point B1 representing the wavelength of the emitted color of the blue LED 2 and the chromaticity point Y1 representing the wavelength of the emitted color of the yellow LED 4 are a white region in the vicinity of the white chromaticity point W1. On both sides of the straight line that passes. As the white emission spectrum of the first light source 6, it is preferable that white light in the white region in the chromaticity diagram shown in FIG. 2 is obtained as synthesized light. More preferably, the length of the line segment connecting the chromaticity point B1 of the blue LED 2 and the white chromaticity point W1 is BW, and the line segment connecting the chromaticity point Y1 of the yellow LED 4 and the white chromaticity point W1. It is preferable that the length YW is configured to have a relationship of BW = YW.

  On the other hand, in the chromaticity diagram shown in FIG. 2, the chromaticity point R1 representing the wavelength of the emission color of the red LED 5 and the chromaticity point G1 representing the wavelength of the emission color of the green LED 3 are white in the vicinity of the white chromaticity point W1. On both sides of a straight line through the area. As the white light emission spectrum of the second light source 7, it is preferable that white light in the white region in the chromaticity diagram shown in FIG. 2 is obtained as synthesized light. The length of the line segment connecting the chromaticity point R1 of the red LED 5 and the white chromaticity point W1 is RW, and the length of the line segment connecting the chromaticity point G1 of the green LED 3 and the white chromaticity point W1 is GW. In some cases, it is more preferable to have a relationship of RW = GW.

  Each of the LEDs 2 to 5 of each color has four wavelength regions having different peak radiances as shown in FIG. The emission wavelengths of the LEDs 2 to 5 of the respective colors are set as required intervals on the wavelength axis, and the emission spectra 200, 300, 400, and 500 indicating the relative radiances of the LEDs 2 to 5 of the respective colors do not overlap each other.

  The first light source 6 is not limited to the illustrated example, but a blue LED 2 having an emission peak wavelength of about 470 nm and a yellow LED 4 having an emission peak wavelength of about 580 nm, for example, can be used. The second light source 7 is not limited to the illustrated example. For example, a green LED 3 having an emission peak wavelength of about 535 nm and a red LED 5 having an emission peak wavelength of about 680 nm can be used. .

  As shown in FIGS. 7 and 8, the white color mixed by the light transmitted through the color filter 20 includes the emission spectra 200, 300, 400, and 500 of the LEDs 2 to 5 for each color and the filter layer 21 a for each color of the color filter 20. , 21b, 22a, 22b are determined by transmission spectra 201, 301, 401, 501. In order to realize white light with the transmission spectra 201, 301, 401, and 501 of the respective colors, the transmission spectra 201, 301, 401, and 501 of the respective colors and the emission spectra 200, 300, 400, and 500 of the respective colors are overlapped. At this time, it is preferable to approximate the transmission spectra 201, 301, 401, and 501 of the respective colors with the emission spectra 200, 300, 400, and 500 of the respective colors. Thereby, the utilization efficiency of light can be improved.

  The blue filter layer 21a is not limited to the illustrated example, but it is preferable to transmit 90% of blue light with a maximum transmittance within a transmission bandwidth range of, for example, about 450 nm to 495 nm. The yellow filter layer 21b is not limited to the illustrated example, but it is preferable to transmit 90% yellow light with a maximum transmittance within a transmission bandwidth range of, for example, about 570 nm to 590 nm. Thereby, pseudo first white light is generated by the color mixture of blue light and yellow light.

  On the other hand, the green filter layer 22a is not limited to the illustrated example, but it is preferable to transmit 90% of green light with a maximum transmittance within a transmission bandwidth range of about 495 nm to 570 nm, for example. is there. The red filter layer 22b is not limited to the illustrated example, but it is preferable to transmit 90% red light with a maximum transmittance within a transmission bandwidth range of about 620 nm to 750 nm, for example. Thereby, pseudo second white light is generated by the color mixture of green light and red light.

Each color filter layer 21a, 22b, 22a, 22b is set to have a transmission peak wavelength in a central wavelength region between the wavelength regions of LEDs 2-5 of each color. For this reason, the light loss of LEDs 2 to 5 of each color can be minimized. When color unevenness occurs during white display, color unevenness can be eliminated by adjusting the number of LEDs 2 to 5 for each color, the current value flowing through the LEDs 2 to 5 for each color, and the like. The white luminance when transmitted through the filter layers 21a, 22b, 22a, and 22b for each color is set to, for example, about 10 cd / m ^{2 in} the case of night illumination. In the case of daytime lighting, for example, it is set to about 150 cd / m ² .

(Effects of the first embodiment)
By adopting the display switching device 1 according to the first embodiment configured as described above, the following effects can be obtained in addition to the above effects.

(1) White light having the same chromaticity can be switched to emit light.
(2) It is possible to switch the display of two types of white W with a simple configuration including the color filter 20 without using a device such as a liquid crystal display (LCD) to switch between the two white lights.

[Second Embodiment]
Referring to FIGS. 9A and 9B, these drawings show a configuration example of a main part of the display switching device 1 according to the second embodiment.

  In the first embodiment, the second embodiment is configured to switch between the first white display and the second white display by using two types of filter layers that transmit two colors. In this case, the second embodiment is different from the first embodiment in that the first white display and the second white display are switched by two kinds of print patterns that transmit two colors.

  Therefore, in these drawings, substantially the same members as those in the first embodiment are denoted by the same member names and reference numerals, and detailed description thereof will be omitted.

  As shown in FIGS. 9A and 9B, the color filter 20 is disposed between a pair of upper and lower upper base materials 9 and a lower base material 10. On the lower surface side of the lower substrate 10, a blue LED 2 and a yellow LED 4, a green LED 3 and a red LED 5 having a complementary color relationship are disposed adjacent to each other. The upper base material 9 and the lower base material 10 are made of, for example, a film-like, sheet-like, or plate-like transparent base material such as polycarbonate resin.

  As shown in FIGS. 9A and 9B, the color filter 20 has a two-layer structure in which the diffusion layers 11 are stacked to be integrated. The two-layer color filter 20 is made of a general material and is not particularly limited. For example, the color filter 20 is formed by applying or printing a filter film and drying it.

  As shown in FIGS. 9A and 9B, the color filter 20 includes a printing unit 24 that is a first filter that transmits two colors of blue and yellow having a complementary color relationship, and green and red having a complementary color relationship. The printing unit 25 is a second filter that transmits the two colors, and the printing unit 26 is a third filter that conceals the colors.

  As in the colored pattern shown in FIG. 3A, the first printing unit 24 has a lattice shape in which blue printing units and yellow printing units are alternately arranged in the vertical and horizontal directions corresponding to the first transmission region S1. The print pattern is formed. A combination of the first printing unit 24 and the first light source 6 constitutes a first white generation unit that generates white light.

  On the other hand, the second printing section 25 is a lattice in which green printing sections and red printing sections are alternately arranged in the vertical and horizontal directions corresponding to the second transmission region S2, similarly to the coloring pattern shown in FIG. It is formed with a printed pattern. A combination of the second printing unit 25 and the second light source 7 constitutes a second white generation unit that generates white light.

  A portion where the first transmission region S1 and the second transmission region S2 overlap is a third transmission region S3 that transmits both the light emission of the first light source 6 and the light emission of the second light source 7, and the first white region It becomes an overlapping portion of the display and the second white display. The third transmission region S3 is a place where white printing may be performed or printing may not be performed.

  The diffusion layer 11 has a light diffusion function for uniformly diffusing incident light. The diffusion layer 11 is formed of a transparent base material or white ink. The light emitted from the first light source 6 and the light emitted from the second light source 7 are combined and diffused uniformly inside the diffusion layer 11 so that the entire first transmissive region S1 or the second transmissive region S2 is dyed white. It has become.

(Effect of the second embodiment)
By adopting the display switching device 1 according to the second embodiment configured as described above, the following effects can be obtained in addition to the above effects.

  Since blue LED 2 and yellow LED 4 having a complementary color relationship, and green LED 3 and red LED 5 are arranged adjacent to each other, light of blue B and yellow Y can be sufficiently mixed with green G and red R. it can.

  As is apparent from the above description, the display switching device of the present invention has been described based on the above-described embodiments, modifications, and illustrated examples. However, the present invention is limited to the above-described embodiments, modifications, and illustrated examples. However, the present invention can be carried out in various modes without departing from the scope of the invention.

  Further, in the present invention, not all the combinations of features described in the above embodiments, modifications, and illustrated examples are necessarily essential to the means for solving the problems of the present invention. It should be noted.

DESCRIPTION OF SYMBOLS 1 ... Display switching device, 2 ... Blue LED, 3 ... Green LED, 4 ... Yellow LED, 5 ... Red LED, 6 ... 1st light source, 7 ... 2nd light source, 8 ... Base material, 9 ... Upper base material, 10 ... Lower substrate, 11 ... Diffusion layer, 20 ... Color filter, 21 ... First filter, 21a ... Blue filter layer, 21b ... Yellow filter layer, 22 ... Second filter, 22a ... Green filter layer, 22b ... Red filter layer , 23 ... third filter, 24 ... first printing section, 25 ... second printing section, 26 ... third printing section, 200 ... blue emission spectrum, 300 ... green emission spectrum, 400 ... yellow emission spectrum, 500 ... red emission Spectrum: 201 ... Blue transmission spectrum, 301 ... Green transmission spectrum, 401 ... Yellow transmission spectrum, 501 ... Red transmission spectrum, B ... Blue, B1, G1, R1, W1, Y1 ... Chromaticity point, G ... Green , R ... red, S1 to S3 ... first to third transmission region, W ... white, Y ... Yellow

Claims (3)

A first light source that emits at least a first color light and a second color light that can be mixed with white light;
A second light source that emits at least a third color light and a fourth color light that can be mixed with white light;
A first color filter that transmits light emitted from the first light source;
A second color filter that transmits light emitted from the second light source;
With
By switching between the first and second light sources to emit light, a first white display is performed by a combination of the first light source and the first color filter, and the second light source and the second light source are displayed. A display switching device that performs second white display in combination with a color filter. The first color filter is provided adjacent to a colored layer that transmits the first color light and the second color light that is complementary to the first color light,
2. The second color filter according to claim 1, wherein a colored layer that transmits the third color light and the fourth color light having a complementary color relationship with the third color light is provided adjacent to the second color filter. Display switching device. The first color light is light in a blue wavelength band,
The second color light is light in a yellow wavelength band,
The third color light is light in a green wavelength band,
3. The display switching device according to claim 1, wherein the fourth color light is light in a red wavelength band.

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