JP2000155309A - Color display device and communication apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a good image display with a color display device of a translucent half reflection type which display approximately white characters and graphics, etc., with approximately black by forming color patterns in relief in a background to stress the graphics, etc., only when needed. SOLUTION: This color display device has a liquid crystal element 10 of a normally white type, a translucent reflection plate 3, color filters 4 formed with prescribed patterns having different transmission characteristics and a back light 6 including a first light source 8a, second light source 8b and third light source 8c respectively varying in main light emission wavelengths. These color filters 4 have first, second and third patterns 5a, 5b and 5c having the low transmission characteristics respectively corresponding to the respective light sources 8a to 8c. Illumination is normally executed by the third light source 8c. The first patterns 5a or the second patterns 5b is formed in relief in the background of a display surface by lighting the first light source 8a or the second light source 8b when needed, by which the approximately black characters, graphics, etc., are stressed and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color display device for partially performing color display, and more particularly to a color display device which can be suitably used for a communication device such as a portable telephone, and a communication device using the same.

[0002]

2. Description of the Related Art A typical liquid crystal display device is a liquid crystal display device. The liquid crystal display device is of a transmissive type using a white light source or the like for a backlight, a reflective type which receives external light and reflects it, and a transmissive type. There is a transflective type or the like having a light reflecting plate. In particular, in the case of communication equipment such as mobile phones and various indicating instruments, it is used in any place such as a bright outdoor room or a dark indoor room. Therefore, a transflective type that can be used as a reflective type and a transmissive type is used. Liquid crystal display devices have become useful. This transflective liquid crystal display device has a transflective plate having both transmissivity and reflectivity for visible light between a liquid crystal element and a light source.

In order to perform color display with these liquid crystal display devices, three primary color types of red, green and blue, or magenta and yellow colors are provided on the liquid crystal side of a transparent substrate such as glass on which a transparent electrode is formed. The mainstream is to arrange a fine color filter having transmission characteristics of the three complementary colors of cyan and to separate white light or the like by the color filter and transmit only a certain color through the liquid crystal layer. However, in such a configuration, since a color filter is provided between the upper and lower liquid crystal substrates sandwiching the liquid crystal layer, the display is excellent in high-definition full-color display and the like. The incidence of non-defective products also tends to increase.

On the other hand, communication devices such as cellular phones and various indicating instruments do not require high-definition full-color display and the like in many cases, and only partial colorization is sufficient, and displays the status of the devices. Therefore, a relatively large pixel is displayed in a figure or the like. In the case of display using large pixels such as these figures and characters, there is no obstacle due to parallax. Therefore, even when color display is to be performed, it is not necessary to provide a color filter between the upper and lower liquid crystal substrates. That is, providing a color filter outside the liquid crystal element simplifies the configuration and manufacturing, and at the same time, can reduce the defect rate.

[0005] In a transflective color liquid crystal display device used for such communication equipment such as a cellular phone and various indicating instruments, a color filter in which a relatively large figure pixel or the like is formed is directly connected to a liquid crystal element. And Japanese Patent Application Laid-Open (JP-A) Nos. 58-7681 and 58-7682. In these, a transmissive color element as a color filter is arranged via a semi-transmissive reflector disposed on the back of the liquid crystal element in order to prevent the pattern of the figure from being seen from the display surface side. The light from the light source is colored with a transmissive color element to divide the display surface into a plurality of color areas, both in the case of a positive display as a mari-white type liquid crystal element and a case of a negative display as a normally black type liquid crystal element. And display characters and numbers. As described above, even in the transflective liquid crystal display device, in order to perform color display, providing a color filter or the like outside the liquid crystal element facilitates manufacture and reduces occurrence of defects.

[0006]

In a small communication device such as a mobile phone, the display surface is also small and small, so that the display of each character or figure can be intuitively recognized in a short time. Then, the display becomes more effective. For example, in order to emphasize the display of each character, figure, etc., if it is possible to emphasize the display of each character, figure, etc. using a specific color pattern without confusing it, it is practically excellent. Become.

In the prior art of the liquid crystal display device described above, a normally white type which displays characters and figures in a substantially black state by blocking visible light with a substantially white state by transmitting visible light as a background color is used. A liquid crystal display element, or a normally black type liquid crystal display element providing a negative display is used at least for the colored portion. However, when a normally white type liquid crystal element is used, the color filter portion is always colored when the light source is turned on, and the background of displayed characters and figures can be uniformly colored, and a sufficient display enhancement effect can be obtained. I can't. On the other hand, when a normally black liquid crystal element is used, the coloring or non-coloring of the background can be selected.However, when the normally black type is used only around the colored area, a boundary can be formed between the normally black portion and the normally white portion, and the light source Not only does the display look bad when lit, but the display is confusing. In addition, when the entire display unit is of a normally black type, characters and graphics are displayed in outline on a black background, and the display becomes dark especially when used in a dark place requiring a light source. It becomes difficult to identify.

On the other hand, in a conventional color display device that does not use a liquid crystal element, the presence or absence of display can be selected depending on whether or not the light source is turned on. However, a good screen that emphasizes only the display cannot be obtained because the background and the display cannot be separated. .

The problem to be solved in the present invention is that a predetermined pattern of a color filter does not needlessly be seen through, and a predetermined pattern of a color appears only on a background of a character or a figure on a display surface only when necessary. It is an object of the present invention to provide a transflective color display device capable of emphasizing and displaying the characters, figures, and the like, and a communication device effectively utilizing the color display device.

[0010]

A color display device according to the present invention comprises a dial, a semi-transmissive reflection plate, a color filter, and a light guide plate each having a pattern printed on a transparent base material in order from the display surface side. A plurality of light sources are arranged via a light source, a reflector, and the like, and the light sources include a first light source, a second light source, and a third light source, each having a different light wavelength, and the color filter has a figure having different transmission characteristics. A first pattern showing high transmittance for both wavelengths of the first light source and the second light source and showing low transmittance for the wavelength of the third light source; The second pattern is formed by superimposing the first pattern and the second pattern, the second pattern having high transmittance with respect to the wavelengths of the light source and the third light source and having low transmittance with respect to the wavelength of the first light source. Characterized by a third pattern To.

Also, in order from the display surface side, a normally white type liquid crystal element, a semi-transmissive reflector, a color filter,
And a plurality of light sources arranged via a light guide plate, a reflection plate, and the like, wherein the first light sources have different light wavelengths,
Including a second light source and a third light source, the color filter includes a pattern such as a graphic having different types of transmission characteristics, and the pattern has high transmittance with respect to the wavelengths of the first light source and the second light source. And a first pattern that exhibits low transmittance with respect to the wavelength of the third light source, and a high transmittance that both exhibit wavelengths with respect to the wavelengths of the second and third light sources and with respect to the wavelength of the first light source. A color display device including a second pattern exhibiting low transparency and a third pattern formed by superimposing the first pattern and the second pattern may be provided.

With such a configuration, by combining the color filter and the plurality of light sources, the second light source or the third light source is turned on only when necessary, so that the second pattern or the third light source having a color different from the surroundings is obtained. The pattern can be displayed. The color filter on which the predetermined pattern is formed is provided along the surface of the semi-transmissive reflection plate opposite to the display surface, and the first to third patterns transmit the second emission wavelength. Since it is possible, the first pattern of the color filter and the like are not seen through, and the
Regardless of whether or not the light source is turned on, the first pattern can be displayed in color by turning on the first light source, and the second pattern can be displayed in color by turning on the second light source.

Here, the color filter has a first pattern exhibiting high transmittance with respect to a wavelength of light less than 600 nm;
In the case of being constituted by a second pattern exhibiting high transmittance for a wavelength of light exceeding 520 nm and a third pattern exhibiting high transmittance for a wavelength of light of 520 nm or more and less than 600 nm, the surrounding background color Is a color without a sense of incongruity such as green or yellow-green, and only the display color of the first pattern and the second pattern to be emphasized can be blue or red. it can. This is because a light emitting diode emitting at a wavelength of less than 520 nm is used as a first light source, a light emitting diode emitting at a wavelength exceeding 600 nm is used as a second light source, and a light emitting diode emitting at a wavelength of 520 nm or more and less than 600 nm is used as a third light source. It can be easily manufactured by using. further,
As a light guide plate, if a light guide plate having a scattering region provided by printing a high refractive index material on a transparent light guide member in a pattern is used, a light guide plate capable of irradiating light from each light source substantially uniformly on the entire display surface is provided. It can be easily manufactured.

In the communication apparatus according to the present invention, the background of the display surface of the color display device is almost uniformly illuminated by the lighting of the second light source, and the first light source is used when a specific incoming call or a specific operation is indicated. Alternatively, the third light source is turned on, and the first pattern appears only when the first light source is turned on, and the second pattern appears only when the third light source is turned on in the background of substantially black characters or figures on the display surface. The liquid crystal display device is characterized in that a predetermined color pattern is raised on the background only when necessary to emphasize characters, figures, and the like.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a dial, a semi-transmissive reflector, a color filter, a light guide plate, and a dial on which a pattern or the like is printed on a transparent substrate in order from the display surface side. A plurality of light sources are disposed via a reflector or the like, and the light sources include a first light source, a second light source, and a third light source having different light wavelengths, and the color filters have different transmission characteristics. A first pattern showing high transmittance for both wavelengths of the first light source and the second light source and showing low transmittance for the wavelength of the third light source; and a second light source. And a second pattern showing high transmittance for both the wavelength of the third light source and showing low transmittance for the wavelength of the first light source, and the first pattern and the second pattern are formed by superposition. A color table composed of a third pattern and A device, a dial, a semi-transmissive reflector, a color filter having a plurality of specific transmission characteristics, and a plurality of specific light sources having different emission wavelengths are combined as described above, so that external light or second light is emitted. Regardless of whether or not the two light sources are turned on, the first light source or the third light source is turned on only when necessary, so that the first pattern or a background different from the third pattern surrounding the third pattern as the background of the displayed character or graphic. This has the effect of enabling the display of the second pattern. The color filter on which the predetermined pattern is formed is provided along the surface of the semi-transmissive reflector opposite to the display surface, and both the first pattern and the second pattern are the first pattern.
Since the emission wavelength can be transmitted, the second pattern of the color filter and the like are not seen through the display surface when the second light source is turned off. Further, since the third pattern is formed by superimposing the first pattern and the second pattern, each pattern can be formed without a gap, and there is an effect that display deterioration due to leak light can be prevented.

According to a second aspect of the present invention, in order from the display surface side, a plurality of light sources are arranged via a normally white type liquid crystal element, a semi-transmissive reflector, a color filter, a light guide plate, a reflector and the like. Wherein the light sources include a first light source, a second light source and a third light source, each having a different light wavelength,
The color filter includes a pattern such as a figure having different transmission characteristics, and the pattern includes a first light source and a second light source.
A first pattern showing high transmittance for both wavelengths of the light source and showing low transmittance for the wavelength of the third light source;
The second pattern is formed by superimposing the first pattern and the second pattern, the second pattern having high transmittance with respect to the wavelengths of the light source and the third light source and having low transmittance with respect to the wavelength of the first light source. A color display device comprising a normally white liquid crystal element, a semi-transmissive reflector, a color filter having a plurality of specific transmission characteristics, and a specific filter having different emission wavelengths. By combining a plurality of light sources as described above, regardless of whether the external light or the second light source is turned on or not, the first light source or the third light source is turned on only when necessary, thereby displaying characters, graphics, and the like. As a background, a first pattern different from the surrounding third pattern
The display of the pattern or the second pattern can be performed, and an effect that various displays can be performed in combination with the display of the liquid crystal element.

According to a third aspect of the present invention, the color filter has a first pattern exhibiting a high transmittance for a light wavelength of less than 600 nm and a high transmittance for a light wavelength of more than 520 nm. Second pattern, 520 nm or more 6
3. The color display device according to claim 1, wherein the color display device is constituted by a third pattern showing high transmittance with respect to a wavelength of light of less than 00 nm. Only the display colors of the first pattern and the second pattern to be emphasized can be blue or red, so that the effect of visual enhancement can be easily obtained and the coloring effect can be clarified.

According to a fourth aspect of the present invention, a light emitting diode emitting at a wavelength of less than 520 nm is used as the first light source, a light emitting diode emitting at a wavelength exceeding 600 nm is used as the second light source, and a light emitting diode of 520 nm or more is used as the third light source. 4. The color display device according to claim 1, wherein the light emitting diode emits light at a wavelength of less than 600 nm, and the surrounding background color is a color such as green or yellow-green without a sense of incongruity. Only the display color of the pattern and the second pattern can be changed to blue or red, so that the effect of visual enhancement can be easily obtained, and the color effect can be clarified. Have.

According to a fifth aspect of the present invention, as the light guide plate,
The color display device according to any one of claims 1 to 4, wherein a light guide plate having a scattering region provided by printing a high refractive index material in a pattern on a transparent light guide member is used. This has the effect that a light guide plate that can irradiate the entire display surface substantially uniformly can be easily manufactured.

According to a sixth aspect of the present invention, there is provided the color display device according to any one of the first to fifth aspects, wherein the background of the display surface of the color display device is made substantially uniform by turning on the third light source. When the first light source or the second light source is lit when displaying a specific incoming call or a specific operation or the like,
The first light source is turned on only when the first light source or the second light source is turned on.
A communication device using a color display device, characterized in that a pattern or a second pattern appears on the background of the display surface, wherein a color predetermined pattern emerges only when necessary on the background to emphasize characters and figures. Has the effect of being able to.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view of a main part of a color display device according to Embodiment 1 of the present invention.

In FIG. 1, a liquid crystal element 10 includes an upper transparent substrate 1 on which an upper transparent electrode 1c and a lower transparent electrode 1d are formed.
A liquid crystal layer 1e is sandwiched between the transparent substrate 1a and the lower transparent substrate 1b, and an upper polarizing plate 2a and a lower polarizing plate 2b are provided above the upper transparent substrate 1a and below the lower transparent substrate 1b, respectively. That is, with such a laminated structure, transmission and blocking of light can be controlled, and characters and graphics are displayed in a substantially black state by blocking the visible light with a substantially white state due to the transmission of visible light as a background color. It is a normally white liquid crystal element. In addition, a spacer material or the like for keeping the thickness of the liquid crystal layer 1e constant, an alignment layer for making the liquid crystal material uniform, or the like may be used, and only one upper and lower polarizing plate may be arranged on one side. .

The example shown in FIG. 1 is a semi-transmissive and semi-reflective type color display device 11 having a semi-transmissive reflector 3 on the lower surface of a liquid crystal element 10 for displaying by reflected light from the outside and a rear surface. This is a configuration in which display by transmitted light from the backlight 6 is compatible. Then, the color display device 1 of the present embodiment
Reference numeral 1 denotes a color filter in which a color filter 4 is arranged along the lower surface of the semi-transmissive reflector 3 on the side opposite to the display surface of the liquid crystal element 10, and a backlight 6 is further provided below the color filter. The backlight 6 uses a light guide plate 7 provided with an upper surface close to the color filter 4 and having a rough reflection / scattering portion on the lower surface, and a light emitting diode having a main emission wavelength of, for example, 470 nm on the side surface. A first light source 8a, a second light source 8b using a light emitting diode having a main emission wavelength of 565 nm,
Third light sources 8c each using a light emitting diode having a main emission wavelength of 630 nm are arranged adjacent to each other, and a white light reflecting plate 9 is provided on the lower surface of the light guide plate 7.

Next, the structure of the color filter 4 will be described in detail with reference to FIG. FIG. 2A shows a color filter 4.
5a and 5b show a first pattern and a second pattern each having a desired display shape, and 5c shows a third pattern as its background. Here, regarding the transmittance of the filter, a case where the transmittance is 60% or more is defined as a high transmittance, and a case where the transmittance is 40% or less is defined as a low transmittance. In FIG. 2A, the first pattern 5a is colored cyan, has high transmittance with respect to the wavelengths of the first light source 8a and the second light source 8b, and has high transmittance with respect to the wavelength of the third light source 8c. It has low transmittance characteristics. Also,
The second pattern 5b is colored yellow, and has a transmission characteristic in which both the second light source 8b and the third light source 8c exhibit high transmittance with respect to the wavelength and the first light source 8a has low transmittance with respect to the wavelength. Have. And the third pattern 5c is the first pattern 5a
Green color obtained by mixing the first light source 8a with the second light source 8b.
In addition, the third light source 8c has a transmission characteristic of low transmission with respect to the wavelength.

FIG. 2B shows components of the color filter 4. The first color filter 4a is colored yellow with the same color as the second pattern 5b, and only the first pattern 5a is uncolored. Further, the second color filter 4b is colored cyan in the same color as the first pattern 5a, and only the second pattern 5b is uncolored. The color filter 4
The first color filter 4a and the second color filter 4b
Are laminated. The first color filter 4a and the second color filter 4b are manufactured by coloring a base material such as transparent acrylic by a dyeing method or a printing method. The color filter does not necessarily need to be separated into two members. For example, when the color filter is manufactured by a printing method, the pattern of the second color filter 4b may be printed directly on the first color filter 4a.

The operation of the thus configured color display device 11 of the present embodiment will be described with reference to FIGS. FIG. 3 is a graph showing the light emission luminance of the light source and the transmittance of the color filter unit according to the first or second embodiment of the present invention, and FIG. 4 is a schematic diagram of the display surface of the color display device according to the first embodiment of the present invention. It is.

First, FIG. 4A shows a state where the liquid crystal element 10 is displayed and the light source is not turned on.
When only the second light source 8b is turned on in this state, the first, second, and third patterns 5a, 5b, 5
In all cases c, since the transmittance at the wavelength of 565 nm, which is the main emission wavelength, is 60% or more, the entire display surface is colored green, and the state shown in FIG. 4B is obtained.

Next, when only the first light source 8a is turned on, light having a main emission wavelength of 470 nm from the first light source 8a is transmitted only through the first pattern 5a and is almost blocked by the second pattern 5b and the third pattern 5c. Figure 4
In the state shown in (c), only the display portion on the first pattern 5a can be highlighted in blue.

Further, when only the third light source 8c is turned on, the light having the main emission wavelength of 630 nm of the third light source 8c is transmitted only through the second pattern 5b, and is almost blocked by the first pattern 5a and the third pattern 5c. 4D, and only the display portion on the second pattern 5b can be highlighted in red.

As described above, the color display device 11 of the present invention
Then, only when necessary, the first light source 8a and the second light source 8b
Is turned on, and a predetermined color pattern emerges in the background to emphasize the display of characters, figures, and the like on the liquid crystal element, whereby a good display screen can be obtained.

In the above-described color display device 11, since the semi-transmissive reflector 3 is present, the predetermined pattern of the color filter 4 is not seen through on the display surface, and the color filter 4 is connected to the first color filter 4a. Each pattern 5 is formed by a two-layer structure of the second color filter 4b and the second color filter 4b.
There is no gap between a, 5b, and 5c, and clear display of the first pattern 5a and the second pattern 5b becomes possible. Since the liquid crystal element 10, the color filter 4, and the backlight 6 are separately manufactured, and these can be integrally formed, the manufacturing is easy.

(Embodiment 2) FIG. 5 is a sectional view of a main part of a liquid crystal display device according to Embodiment 2 of the present invention.

In FIG. 5, a dial 12 having characters and figures printed on a transparent substrate is arranged on the semi-transmissive reflection plate 3, and a color filter 13 is arranged below. The color display device 15 according to the present embodiment is configured by arranging the dial 12, the semi-transmissive reflection plate 3, and the color filter 13 in order from the display surface side and including the backlight 6 at the lower end. The backlight 6
The light guide plate 7, the first light source 8a, the second light source 8b, the third light source 8c, and the reflection plate 9 are the same as those described in the first embodiment.

FIG. 6 is a front view of the color filter 13 of the color display device according to the second embodiment of the present invention.
Reference numerals a and 14b denote a first pattern and a second pattern, each of which has a desired display shape, and reference numeral 14c denotes a third pattern serving as the background. The coloring of each of the patterns 14a, 14b, and 14c and the configuration of the color filter 13 are the same as those in the first embodiment. However, in the present embodiment, since the patterns themselves are displayed, the first pattern 14a and the second The pattern 14b is a pattern having a design property such as a character.

The operation of the thus configured color display device 15 of the present embodiment will be described with reference to FIGS. FIG. 3 shows the transmission characteristics of the color filter used in the first embodiment.
Characteristic curves shown as the third to third pattern portions correspond to the first, second, and third patterns 14a, 14b,
14C is a graph showing the relationship between each transmission characteristic of the color filter 13 and each emission wavelength of the light sources 8a, 8b, 8c, which can correspond to 14c. FIG. 7 is a schematic diagram of a display surface of a liquid crystal display device according to Embodiment 2 of the present invention.

First, when the backlight 6 is not used, the external light is reflected by the semi-transmissive reflector 3, and the dial 12 is displayed. Here, when only the second light source 8b is turned on, the first to third patterns 14 of the color filter 13 are turned on.
In all of a, 14b, and 14c, the transmittance at the wavelength of 565 nm, which is the main emission wavelength, is 60% or more, so that the entire display surface is colored green, and the state shown in FIG.

Next, when both the first light source 8a and the second light source 8b are turned on, the main light emission wavelength of the first light source 8b is 470 nm.
Is transmitted only through the first pattern 14a and passes through the second pattern 14a.
b and the third pattern 14c are almost shielded, so that the second pattern 14b and the third
In the green background 4c, only the first pattern 14a emerges in cyan, which is a mixed color of blue and green, and FIG.
The state shown in FIG. Further, when both the third light source 8c and the second light source 8b are turned on, the light having the main emission wavelength of 630 nm of the third light source 8c is transmitted only through the second pattern 14b and is almost blocked by the first pattern 14a and the third pattern 14c. Therefore, the second pattern 1 is placed in the green background of the first pattern 14a and the third pattern 14c.
Only 4b emerges in yellow, which is a mixed color of red and green, and becomes the state of FIG. 7C.

As in the first embodiment, if the second light source 8b is not turned on, the first light source 8a is turned on and the first light source 8a is turned on.
The pattern 14a can be displayed in blue, and the second pattern 14b can be displayed in red by turning on the third light source 8c.

As described above, also in the second embodiment,
Only when necessary, the first light source 8a and the third light source 8c are turned on, and a predetermined color pattern is displayed on the background only when necessary, and the display of characters and figures on the dial is emphasized to enhance the display. A display screen is obtained. Further, the presence of the semi-transmissive reflector 3 prevents the predetermined pattern of the color filter 13 from being seen through on the display surface.
Since the color filters 13 are formed by overlapping two color filters, no gap is formed between the patterns, and clear display of the first pattern 14a and the second pattern 14b can be obtained.

In the second embodiment, the background can be displayed independently of the dial 12. That is, in the color display device 15 of the second embodiment, the dial 12
When a normally white liquid crystal element is combined instead of the above, display of the liquid crystal element and background display can be performed independently by the same operation as the liquid crystal display device of Embodiment 1, and diversification of display can be achieved. Can be planned.

[0041]

In the color display device according to the first aspect of the present invention, by disposing the color filter below the semi-transmissive reflector, the predetermined pattern of the color filter is not seen through the display surface unnecessarily. . A first light source,
A first pattern and a second light source that exhibit high transmittance with respect to wavelengths of the first light source and the second light source and low transmittance with respect to the wavelength of the third light source; And a second pattern that exhibits high transmission both at the wavelength of the third light source and low transmission at the wavelength of the first light source;
Combining a color filter composed of a first pattern and a third pattern formed by superimposing the second pattern;
By selectively illuminating each light source, it is possible to display a predetermined color pattern in the background of characters and figures on the dial only when necessary, and to display good images with the characters and figures emphasized. Becomes Furthermore, since the third pattern is formed by superimposing the first pattern and the second pattern, no gap is formed between the patterns, and a decrease in display performance due to light leakage from the light source is prevented.

In the color display device according to the second aspect, since the color filter is arranged outside the liquid crystal element, a transflective liquid crystal display device can be easily manufactured, and the color filter is provided below the transflective reflector. Is arranged, the predetermined pattern of the color filter is not seen through the display surface unnecessarily. In addition, the first light source, the second light source, and the third light source, and the first light source and the second light source that both exhibit high transmittance with respect to the wavelength of the first light source and low transmittance with respect to the wavelength of the third light source. One pattern, a second pattern showing high transmittance with respect to the wavelengths of the second light source and the third light source and a low transmittance with respect to the wavelength of the first light source, and a superposition of the first pattern and the second pattern. By combining a color filter composed of a third pattern formed by the combination and selectively lighting each light source, when a predetermined color pattern is required for the background of characters, graphics, etc. on the normally white display surface. , And a good image display in which the characters, figures, and the like are emphasized becomes possible. Furthermore, since the third pattern is formed by superimposing the first pattern and the second pattern, no gap is formed between the patterns, and a decrease in display performance due to light leakage from the light source can be prevented.

According to the third aspect of the present invention, only the display color of the first and second patterns to be emphasized is set to blue, with the second emission wavelength, which is the background color when the backlight is used, being a color such as green or yellowish green that does not cause discomfort. Or red, so that a visual enhancement effect is easily obtained, and a coloring effect can be clarified.

According to the fourth aspect of the present invention, the surrounding background color can be a color that does not cause discomfort such as green or yellowish green, and only the display colors of the first and second patterns to be emphasized can be blue or red. In addition, a light-emitting diode that can easily obtain an emphasis effect and clarify a coloring effect can be easily manufactured using an existing light-emitting diode.

According to the fifth aspect of the present invention, it is possible to easily produce a light guide plate capable of irradiating the light from each light source substantially uniformly on the entire display surface.

According to the sixth aspect of the present invention, there is provided a communication system capable of displaying a good screen emphasizing characters, figures, and the like by highlighting a predetermined color pattern only when necessary on the background of characters, figures, etc. in a substantially black state on the display surface. Equipment is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a color display device according to Embodiment 1 of the present invention.

FIG. 2 is a front view of a color filter of the color display device according to the first embodiment of the present invention.

FIG. 3 is a graph showing light emission luminance of a light source and transmittance of a color filter unit according to the first or second embodiment of the present invention.

FIG. 4 is a schematic diagram of a display surface of the color display device according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a liquid crystal display device according to Embodiment 2 of the present invention.

FIG. 6 is a front view of a color filter of a color display device according to Embodiment 2 of the present invention.

FIG. 7 is a schematic diagram of a display surface of a liquid crystal display device according to Embodiment 2 of the present invention.

[Explanation of symbols]

 1a Upper transparent substrate 1b Lower transparent substrate 1c Upper transparent electrode 1d Lower transparent electrode 1e Liquid crystal layer 2a Upper polarizing plate 2b Lower polarizing plate 3 Semi-transmissive reflector 4 Color filter 5a First pattern 5b Second pattern 5c Third pattern 6 Back Light 7 Light guide plate 8a First light source 8b Second light source 8c Third light source 9 Reflector plate 10 Liquid crystal element 11 Color display device 12 Dial 13 Color filter 14a First pattern 14b Second pattern 14c Third pattern 15 Color display device

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Keita Ihara 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 2H091 FA02Z FA08X FA08Z FA15Z FA23Z FA31Z FA41Z FA45Z FD04 FD06 LA16

Claims (6)

[Claims] A plurality of light sources are arranged in order from a display surface side through a dial, a semi-transmissive reflector, a color filter, a light guide plate, a reflector, etc., on which a pattern or the like is printed on a transparent substrate. Wherein the light sources have different wavelengths of light.
A light source, a second light source, and a third light source, wherein the color filter includes a pattern such as a graphic having different transmission characteristics, and the pattern is high with respect to the wavelengths of the first light source and the second light source. A first pattern exhibiting transparency and exhibiting low transparency with respect to the wavelength of the third light source, and exhibiting high transparency both with respect to the wavelengths of the second light source and the third light source; A color display device comprising: a second pattern having low transmittance with respect to the wavelength of one light source; and a third pattern formed by superimposing the first pattern and the second pattern. 2. A plurality of light sources are arranged in order from a display surface side via a normally white liquid crystal element, a semi-transmissive reflector, a color filter, a light guide plate and a reflector, and the light sources are different from each other. A first light source having a wavelength of light, a second light source
A light source and a third light source, wherein the color filter includes a pattern such as a figure having different kinds of transmission characteristics, and the pattern has high transmittance with respect to wavelengths of the first light source and the second light source. A first pattern having low transmittance with respect to the wavelength of the third light source, and a high transmittance with respect to the wavelengths of the second light source and the third light source, and the wavelength of the first light source. The second shows low permeability to
A color display device, comprising: a pattern; and a third pattern formed by overlapping the first pattern and the second pattern. 3. The color filter according to claim 1, wherein the color filter has a first pattern exhibiting high transmittance with respect to a wavelength of light of less than 600 nm;
Claims: It is constituted by a second pattern exhibiting high transmittance for a wavelength of light exceeding 0 nm and a third pattern exhibiting high transmittance for a wavelength of light of 520 nm or more and less than 600 nm. Item 3. A color display device according to item 1 or 2. 4. A light emitting diode which emits light at a wavelength of less than 520 nm as a first light source, and a light source of 600 nm is used as a second light source.
m using a light emitting diode emitting at a wavelength exceeding
2. A light emitting diode which emits light at a wavelength of 520 nm or more and less than 600 nm as a light source.
4. The color display device according to any one of items 1 to 3. 5. The light guide plate according to claim 1, wherein a light guide plate having a scattering region provided by printing a high refractive index material in a pattern on a transparent light guide member is used as the light guide plate. The color display device as described in the above. 6. A color display device according to claim 1, wherein a background of a display surface of said color display device is substantially uniformly illuminated by lighting of a third light source, and a specific incoming call or When displaying a specific operation or the like, the first light source or the second light source is turned on, and the first pattern or the second pattern appears on the background of the display surface only when the first light source or the second light source is turned on. A communication device using a color display device.