Display device, display board

Abstract

To provide a display device and a display panel which, while having a simple configuration, can prevent or suppress a decrease in visibility of display contents caused by transmitted light being seen around a red light-emitting display part when irradiated with red light, and around a green light-emitting display part when irradiated with green light. [Solution] A display panel is constructed by having a red smoke section 5 printed in red and having translucency, a green smoke section 6 printed in green and having translucency, a gray smoke section 7 printed in gray and having translucency, and a non-translucent light-shielding filter section 8 on a base material placed in a position facing a light source. When irradiated with red light, the red smoke section 5 and the gray smoke section 7 emit red light and the green smoke section 6 and the light-shielding filter section 8 appear black, and when irradiated with green light, the green smoke section 6 and the gray smoke section 7 emit green light and the red smoke section 5 and the light-shielding filter section 8 appear black.

Description

[Technical field]

[0001] The present invention relates to a display device capable of switching between red light emission and green or blue light emission, which are complementary colors of red, and a display panel applicable to the display device. [Background technology]

[0002] Conventionally, there has been known a display device capable of variable display by switching the wavelength of a light source on a display panel that combines a light-shielding filter and a transmission filter using a color filter. For example, the following Patent Document 1 discloses a display panel in which a two-color light source that can switch between red light and green or blue light is arranged directly under a single substrate made of a red filter, a green or blue filter, an achromatic filter, and a light-shielding filter, and when red illumination is applied, a red light emission display is obtained by transmitting the red filter and the achromatic filter, and when green or blue illumination is applied, a green or blue light display is obtained by transmitting the green or blue filter and the achromatic filter. Hereinafter, for convenience of explanation, green or blue will be simply expressed as "green" or "green".

[0003] The same patent document discloses that by using an achromatic filter, which is a filter applied to a portion of the base material that is displayed both when red light is emitted and when green light is emitted, and which is coated with an achromatic paint adjusted so that the difference in luminance between red illumination light after passing through the red filter and the luminance after passing through the achromatic filter, and the difference in luminance between green illumination light after passing through the green filter and the luminance after passing through the achromatic filter, are both within 15% of the luminance after passing through the achromatic filter, it is possible to make color unevenness and luminance unevenness less noticeable between the red filter that has transmitted red light and the achromatic filter, and between the green filter that has transmitted green light and the achromatic filter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-55750 A (Patent No. 4463706 A) Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the inventors conducted testing, they found that with the configuration described in the above patent document, the light-shielding filter did not provide a sufficient light-shielding effect, and the light that was not completely blocked was visible as transmitted light around the red-emitting display area and the green-emitting display area, making it difficult to see the displayed content (letters, patterns) and that the shape of the light source was visible through the base material.

[0006] Here, the light-shielding filter described in the above patent document is formed by applying a light-transmitting red paint to form a red filter and a light-transmitting green paint to form a green filter in layers. Therefore, the light-shielding filter itself is formed by applying light-transmitting paint in layers, and the light that cannot be completely blocked from the light-shielding filter (red irradiation light, green irradiation light) is visible as transmitted light.

[0007] After extensive research, the inventors have come up with a display device that, despite its simple configuration, can prevent or suppress a decrease in visibility of the displayed content caused by transmitted light being visible around the red-light-emitting display area when red light is irradiated, and around the green-light-emitting display area when green light is irradiated, as well as a display panel that can be applied to this display device. [Means for solving the problem]

[0008] That is, the display device according to the present invention comprises a light source capable of switching between emitting red and green light, which are complementary colors, a switch for switching between emitting red light and green light from the light source, and a substrate made of a transparent material on which display content that is irradiated by the light source to be displayed as red light and display content that is irradiated by the light source to be displayed as green light are printed, the substrate comprising a red smoke portion printed in red and having translucency, a green smoke portion printed in green and having translucency, a gray smoke portion printed in gray and having translucency, and a non-translucent light-shielding filter portion printed in black, The display panel is provided with a non-transparent sub-light-shielding filter printed in black or white so as to overlap the light-shielding filter section, and is characterized in that when red light is irradiated, the red smoke section and the gray smoke section emit red light and the green smoke section, together with the light-shielding filter section and the sub-light-shielding filter, is displayed black, and when green light is irradiated, the green smoke section and the gray smoke section emit green light and the red smoke section, together with the light-shielding filter section and the sub-light-shielding filter, is displayed black. Here, "green" in this device is the complementary color of red, and includes blue-green or blue. In other words, "green" in this device includes all colors from green to blue that are complementary to red.

[0009] The inventors have discovered that with such a display device according to the present invention, the light-shielding filter section, which has no light-transmitting properties, appears black when illuminated with red light or green light, and this light-shielding filter section exhibits light-shielding properties, thereby doubling the light-shielding filter section and the light-shielding filter section to provide an even higher light-shielding effect, thereby eliminating the problem that light irradiated from the light source appears as transmitted light around the red and green light-emitting display sections, making it difficult to see the characters (patterns), and providing an excellent display function in which the entire red light-emitting display section appears uniform when illuminated with red light, and the entire green light-emitting display section appears uniform when illuminated with green light.

[0010] In addition, the display device of the present invention is equipped with a switch for switching between emitting red and green light from the light source, so that the emitted light can be switched to turn on the red light display or turn on the green light display based on the user's switch operation, making it highly practical.

[0011] In particular, if the switch is equipped with a sensor that detects the touch or proximity of the user, the switch can be easily operated and the display device can be used as one with excellent usability.

[0012] In addition, the display board according to the present invention comprises a substrate made of a transparent material on which is printed display content that will be displayed as red light and display content that will be displayed as green light when irradiated with a light source of either red or green, which are complementary colors, and the substrate used has a red smoke portion printed in red and having translucency, a green smoke portion printed in green and having translucency, a gray smoke portion printed in gray and having translucency, a light-shielding filter portion printed in black and a non-translucent sub-light-shielding filter portion printed in black or white so as to overlap the light-shielding filter portion, and is characterized in that when irradiated with red light, the red smoke portion and the gray smoke portion emit red light and the green smoke portion, together with the light-shielding filter portion and the sub-light-shielding filter, appear black, and when irradiated with green light, the green smoke portion and the gray smoke portion emit green light and the red smoke portion, together with the light-shielding filter portion and the sub-light-shielding filter, appear black.

[0013] A display board according to the present invention has a similar structure to the display board of the display device described above, and therefore can obtain the same effects as those described above, and can also easily accommodate replacement of only the display board. Effect of the Invention

[0014] According to the present invention, by adopting a novel and useful configuration in which a non-transparent light-shielding filter section printed in black is formed on a base material constituting a display panel that can change between red and green displays depending on the color of the light source, it is possible to prevent and suppress a decrease in visibility of the displayed content due to transmitted light being visible around the red and green light-emitting display sections, and to provide a highly versatile display device and display panel that can be used for a variety of purposes. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a diagram illustrating a positional relationship between the display device according to the embodiment and a user's viewpoint. [Diagram 2] FIG. 4 is a diagram showing a coating area of ​​a red smoke portion in the embodiment. [Diagram 3] FIG. 4 is a diagram showing a coating area of ​​a green smoke portion in the embodiment. [Figure 4] FIG. 4 is a diagram showing a coating area of ​​a gray smoke portion in the embodiment. [Diagram 5] FIG. 4 is a diagram showing a coating area of ​​a light-shielding filter portion in the embodiment. [Figure 6] 5A and 5B are diagrams showing application areas of each smoke portion and a light-shielding filter portion in the embodiment; [Figure 7] FIG. 4 is a diagram showing a coating area of ​​a sub light-shielding filter portion in the embodiment. [Figure 8] 4 is a diagram showing a part that emits red light and displays red light when irradiated with red light in the embodiment; FIG. [Figure 9] 4 is a diagram showing a part that emits green light when irradiated with green light in the embodiment; FIG. [Figure 10] FIG. 2 is a diagram showing an application example of the display device according to the embodiment. [Figure 11] FIG. 13 is a diagram showing a portion that emits red light when irradiated with red light in one modified example of the display content. [Figure 12] FIG. 13 is a diagram showing a portion that emits green light and displays green light when irradiated with green light in the modified example. [Figure 13] 13 is a diagram showing application areas of each smoke portion and light-shielding filter portion in the modified example. FIG. [Figure 14]13 is a diagram showing a coating area of ​​a sub light-shielding filter portion in the modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] 8 and 9, the display device X according to this embodiment is capable of changing the display content displayed on the display panel 2 by switching the wavelength of light emitted from the light source 1. The display device X according to this embodiment is configured to display the three characters "off" and a power mark indicating the off state (a mark consisting of a circle with the top cut out and a "|" inside) in red when emitting red light (see FIG. 8), and to display the two characters "on" and a power mark indicating the on state (a "|" mark) in green when emitting green light (see FIG. 9).

[0018] The light source 1 may be any light source capable of switching between emitting red and green light. In this embodiment, a light source capable of providing surface-emitting illumination is used in which multiple red and green LEDs are arranged in a specified area within the housing 3 (see FIG. 1).

[0019] The display board 2 is mainly composed of a substrate 21 (including a sub-substrate 22 described later) made of a transparent material, and an appropriate design pattern is formed on the substrate 21. The design pattern is determined by a red smoke section 5, a green smoke section 6, a gray smoke section 7, and a light-shielding filter section 8 formed on the substrate 21. The substrate 21 may be made of any material that has light-transmitting properties, and a resin plate material such as polycarbonate or polyester is suitable. The size and thickness of the substrate 21 can be determined taking into consideration the manner of use, the environment in which it is used, and the like. The substrate 21 can be used as the display board 2 as is, or after being covered with an appropriate protective material such as a cover film.

[0020] The red smoke portion 5 is formed by applying a translucent red paint to the base material 21. Fig. 2 shows a formation pattern of the red smoke portion 5 in this embodiment (a region coated with the translucent red paint). The paint printed on the red smoke portion 5 is adjusted to block green illumination and transmit red illumination. In other words, the red smoke portion 5 has translucency printed in red so that it appears red when irradiated with red light, but appears black when irradiated with green light.

[0021] The green smoke portion 6 is formed by applying a translucent green paint to the base material 21. Fig. 3 shows a formation pattern of the green smoke portion 6 in this embodiment (a region coated with the translucent green paint). The paint printed on the green smoke portion 6 is a paint adjusted to block red illumination and transmit green illumination. In other words, the green smoke portion 6 has translucency printed in green so that it appears green when illuminated with green light, but appears black when illuminated with red light.

[0022] The gray smoke portion 7 is formed by applying a translucent gray paint to the base material 21. FIG. 45 shows a formation pattern (a region coated with a translucent gray paint) of the gray smoke portion 7 in this embodiment. The gray smoke portion 7 has translucency printed in gray so that it appears green together with the green smoke portion 6 when irradiated with green light and appears red together with the red smoke portion 5 when irradiated with red light. Note that a correction paint can be added to the gray paint applied to the gray smoke portion 7 to adjust the luminance correction so that the difference in luminance between the red smoke portion 5 and the gray smoke portion 7 that have transmitted red light, and the difference in luminance between the green smoke portion 6 and the gray smoke portion 7 that have transmitted green light are both within the range of −30 to +30% of the luminance of the gray smoke portion 7.

[0023] The light-shielding filter section 8 is produced by applying a non-transparent black paint to the base material 21. Fig. 5 shows a formation pattern (a region coated with black paint) of the light-shielding filter section 8 in this embodiment. The light-shielding filter section 8 is printed in black so that it appears black when irradiated with both green light and red light.

[0024] In this embodiment, the red smoke section 5, the green smoke section 6, the gray smoke section 7, and the light-shielding filter section 8 are applied to a common base material 21, specifically, by screen printing or inkjet printing. As shown in FIG. 6, the red smoke section 5, the green smoke section 6, the gray smoke section 7, and the light-shielding filter section 8 are formed at positions that do not overlap with each other, and therefore can be formed simultaneously on the common base material 21 by one inkjet printing. In the case of silk screen printing, since simultaneous printing of different colors is not possible, each section (red smoke section 5, green smoke section 6, gray smoke section 7, light-shielding filter section 8) can be formed by applying a coating process in order on the base material 21. The order of application is not particularly limited.

[0025] Moreover, in the display device X according to the present embodiment, a sub light-shielding filter section 9 that does not have light-transmitting properties is disposed in a portion overlapping with the light-shielding filter section 8. Since the sub light-shielding filter section 9 is formed in a portion overlapping with the light-shielding filter section 9, it is not possible to form the sub light-shielding filter section 9 and the light-shielding filter section 8 simultaneously on the common base material 21 by one inkjet printing. When the sub light-shielding filter section 9 is formed by inkjet printing or silk screen printing, the order of application of the sub light-shielding filter section 9 and the light-shielding filter section 8 does not matter in which case. In the present embodiment, the sub light-shielding filter section 9 is formed in a position (layer) closer to the light source 1 than the light-shielding filter section 8. In this way, the display device X according to the present embodiment has a double (two-layer) light-shielding filter section that does not have light-transmitting properties.

[0026] The sub light-shielding filter portion 9 is produced by applying a non-transparent black paint or white paint to the base material 22. Fig. 7 shows a formation pattern (a region coated with the black paint or the white paint) of the sub light-shielding filter portion 9 in this embodiment. The formation pattern of the light-shielding filter portion 8 and the formation pattern of the sub light-shielding filter portion 9 are the same.

[0027] As shown in FIG. 1, the display device X according to this embodiment has a display panel 2 made up of two substrates 21 and 22, and a design filter section is formed on the sub-substrate 22, which is the substrate on the front side. FIG. 1 shows a schematic positional relationship between the substrate 21 and the sub-substrate 22 constituting the display panel 2. The size of the sub-substrate 22 is approximately the same as that of the substrate 21, and the design filter section is applied to the sub-substrate 22 by screen printing or inkjet printing. The design filter section of this embodiment is created by applying a light-transmitting opaque color, that is, a white paint that partially transmits light, to the substrate 22. The sub light-shielding filter section 9 is a portion that has been subjected to an opaque (white) light-transmitting opaque color opaque processing.

[0028] In this embodiment, the base material 21 and the sub-base material 22 are inseparably bonded together with an appropriate adhesive to maintain a combined state in which the sub-base material 22 is on the front side (the surface closer to the user's viewpoint V) than the base material 21, thereby forming a display panel 2 that can be handled as a single unit (see Figure 1).

[0029] In the display device X of this embodiment, such a display board 2 is installed at a position at a predetermined distance from the light source 1 in such an orientation that the planar direction of the display board 2 is perpendicular to the light beam direction (see FIG. 1). In addition, the display device X of this embodiment is configured so that the switching of the light emitted by the light source 1 can be controlled based on a signal from a touch sensor. As the touch sensor, one that operates by detecting contact with a user's finger or the like or one that operates by detecting the proximity of a finger or the like can be used, and the emission state of the red light or green light of the light source may be switched depending on the presence or absence, number, pattern, etc. of contact or proximity. The touch sensor may be connected to a controller that switches from an off state to an on state upon the first contact or proximity and simultaneously emits red or green light, or may be provided with an on / off switching function.

[0030] An appropriate circuit related to a touch sensor is connected to the light source 1. Such light source 1 and the circuit are arranged in a common housing 3. Note that as a changeover switch for the light source 1, a manual changeover system such as a tact switch or toggle switch can also be adopted instead of a signal changeover system using a sensor or the like.

[0031] According to the display device X of this embodiment, the red smoke section 5 and the gray smoke section 7 can be displayed in red light when red light is irradiated, and the green smoke section 6 and the light-shielding filter section 8 can be displayed in black. Here, FIG. 8 shows the part that emits red light when red light is irradiated. The inventor confirmed that the display device X of this embodiment has a high light-shielding effect because it is provided with the light-shielding filter 8 that is printed in black and does not have light-transmittance, and can prevent or suppress the situation in which the light that cannot be completely blocked is seen as transmitted light around the red light-emitting display section. In particular, the display device X of this embodiment has a sub-light-shielding filter section 9, which provides an even higher light-shielding effect. In addition, the display device X of this embodiment has a design filter section, which improves the design, and it has been found that the shape of the light source 1 cannot be seen through the base materials 21 and 22, or is extremely difficult to see. Furthermore, it was found that in the display device X according to this embodiment, color unevenness and luminance unevenness cannot be visually recognized between the red smoke portion 5 and the gray smoke portion 7 in the red light-emitting display portion, resulting in a clear red light-emitting display state.

[0032] Moreover, according to the display device X of this embodiment, when green light is irradiated, the green smoke section 6 and the gray smoke section 7 can be caused to emit green light, and the red smoke section 5 and the light-shielding filter section 8 can be caused to emit black light. Here, FIG. 9 shows the part that emits green light when green light is irradiated. In the display device X of this embodiment, color unevenness and luminance unevenness cannot be visually recognized between the green smoke section 6 and the gray smoke section 7 in the green light-emitting display part, resulting in a clear green light-emitting display state, and when green light is irradiated, the display content of the red smoke section 5 is difficult to recognize, resulting in a state in which the green light-emitting display content is prominently seen, and a high light-shielding effect can be obtained, thereby preventing or suppressing a situation in which light that cannot be completely blocked is seen as transmitted light around the green light-emitting display part and a situation in which the shape of the light source 1 is seen through the display board 2.

[0033] As described above, the display device X according to this embodiment has a simple configuration, yet exhibits an excellent display function in which the entire red light-emitting display portion appears uniform when irradiated with red light, and the entire green light-emitting display portion appears uniform when irradiated with green light, and can prevent or suppress a decrease in visibility of the display content caused by transmitted light being visible around the red light-emitting display portion or the green light-emitting display portion, thereby making it possible to provide a highly versatile display device that can be used for various applications.

[0034] In particular, the display device X according to this embodiment is provided with a switch for switching between irradiating red light and green light from the light source, and therefore the irradiated light can be switched to a red light emission display ON state or a green light emission display ON state based on a user's switch operation. Furthermore, by applying a switch equipped with a sensor for detecting the user's contact or proximity, the user can easily operate the switch, and the display device X can be used as a highly practical display device that is easy to use.

[0035] In addition, since the display board 2 according to this embodiment includes the above-mentioned substrate 21, it has a simple configuration and can appropriately display the display content by being irradiated with a red or green light source, and the display content can be easily switched. Furthermore, since only the display board 2 can be replaced in the display device X, it is easy to replace the display board 2 when it is damaged, or to change the design by replacing it with a display board 2 with a different display content.

[0036] The present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. 10, a switch box for various switches such as a firefly switch (a switch that lights a lamp of a predetermined color (e.g., green) when the switch is "off") that can be set on the wall of a building can be used as the housing 3, a light source and a circuit can be housed in this housing 3, and a display panel 2 of the present invention can be attached to a position that blocks the front opening 31 of the housing 3 (a position where the switch body and the light-up display unit are located in the case of a firefly switch). In the figure, two display units that can switch between red light emission display and green light emission display are arranged vertically at a predetermined interval. The frame W of each display unit in the figure is printed in a low-saturation color such as black on the sub-base material 22 as a part of the design filter unit. The frame W forms the design filter unit together with a part that has been subjected to opaque processing of a translucent opaque color (white), and becomes a display frame that is easy to see from the user side. By designing the display content of each display portion (display content within frame W) to reflect the ON / OFF state of a different lighting fixture, it is possible to realize a wall switch that can control the ON / OFF state of two lighting fixtures using a single switch box. It is also possible to configure the lighting state of each lighting fixture to be switched ON / OFF individually by touching the light-emitting display portion. Note that a manual changeover switch can also be used. A display device with only one light-emitting display portion or three or more light-emitting display portions on one display board is also possible.

[0037] The content (design) of the red or green light display on the display portion can be appropriately selected and changed, and as an example, as shown in Figures 11 and 12, when red light is irradiated, the three characters "off" and an illustration that allows intuitive understanding that the bulb is off are displayed in red (see Figure 11), and when green light is irradiated, the two characters "on" and an illustration that allows intuitive understanding that the bulb is on are displayed in green (see Figure 12). Note that Figures 13 and 14 correspond to the above-mentioned Figures 6 and 7, respectively, when this modified example is adopted, and the conditions of the formation process and formation pattern of each smoke portion, light-shielding filter portion, and sub-light-shielding filter portion are similar to those of each smoke portion 5, 6, and 7, light-shielding filter portion 8, and sub-light-shielding filter portion 9 in the above-mentioned embodiment.

[0038] The display device of the present invention also includes an embodiment in which the design filter section is formed on a substrate on which the red smoke section, etc., is formed. In this case, it is important to determine the order in which paint is applied to the substrate (the order in which printing is performed) so that the design filter section is positioned on the front side (the surface closer to the user's viewpoint) than the red smoke section, green smoke section, gray smoke section, and light-shielding filter section.

[0039] In addition, the display device of the present invention may be one in which the design filter part is formed on the entire or almost entire substrate or sub-substrate. In particular, when the display content of the green smoke part is visible when red light is irradiated, or when the display content of the red smoke part is visible when green light is irradiated, there is a risk that the light-emitting display part will be difficult to see, but by disposing the design filter part printed in an opaque (white) color having translucency at a position on the front side (the surface closer to the user's viewpoint V) than the red smoke part or the green smoke part and overlapping with the red smoke part or the green smoke part, the display content of the green smoke part will be difficult to see when red light is irradiated, and the red light-emitting display content will be prominently seen, and when green light is irradiated, the display content of the red smoke part will be difficult to see, and the green light-emitting display content will be prominently seen. Furthermore, by disposing the design filter section on the front side (the surface closer to the user's viewpoint) than the red smoke section, green smoke section, and gray smoke section and at a position overlapping these red smoke section, green smoke section, and gray smoke section, it is possible to make the shape of the light source even more difficult to see through these smoke sections.

[0040] Furthermore, in the above embodiment, the case where green is used as the complementary color of red has been described, but the display device of the present invention also includes a configuration in which blue or blue-green is used as the complementary color of red.

[0041] In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0042] 1...Light source 2...Display board 21,22...Base material 5…Red smoke section 6…Green smoke section 7…Gray Smoke Section 8…Light-shielding filter section 9…Sub-light shielding filter section

Claims

1. A light source that can switch between red and green light, which are complementary colors, and A switch for switching between irradiating red light and green light from the light source; a transparent material substrate on which display content that is irradiated with the light source to be displayed in red light and display content that is irradiated with the light source to be displayed in green light are printed; The substrate is a red smoke portion printed in red and having translucency; a green smoke portion printed in green and having translucency; a gray smoke portion printed in gray and having translucency; a light-shielding filter portion that is printed in black and does not have light-transmitting properties; a sub-light-shielding filter having no light-transmitting property and printed in black or white so as to overlap the light-shielding filter portion, a display device configured so that, when red light is irradiated, the red smoke portion and the gray smoke portion are displayed with red light emission and the green smoke portion, together with the light-shielding filter portion and the sub-light-shielding filter, are displayed in black, and, when green light is irradiated, the green smoke portion and the gray smoke portion are displayed with green light emission and the red smoke portion, together with the light-shielding filter portion and the sub-light-shielding filter, are displayed in black.

2. 2. The display device according to claim 1, wherein the switch includes a sensor that detects contact or proximity of a user.

3. A display panel having a transparent substrate on which display content is printed, the display content being a red light display when irradiated with a light source of either red or green, which are complementary colors, and the display content being a green light display, The substrate is a red smoke portion printed in red and having translucency; a green smoke portion printed in green and having translucency; a gray smoke portion printed in gray and having translucency; a light-shielding filter portion that is printed in black and does not have light-transmitting properties; a non-transparent sub-light-shielding filter printed in black or white so as to overlap the light-shielding filter portion; a display panel configured so that, when red light is irradiated, the red smoke portion and the gray smoke portion are displayed with red light emission and the green smoke portion, together with the light-shielding filter portion and the sub-light-shielding filter, are displayed in black, and, when green light is irradiated, the green smoke portion and the gray smoke portion are displayed with green light emission and the red smoke portion, together with the light-shielding filter portion and the sub-light-shielding filter, are displayed in black.

Images