JP4581796B2 - Display device and electronic device - Google Patents

Display device and electronic device Download PDF

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JP4581796B2
JP4581796B2 JP2005105746A JP2005105746A JP4581796B2 JP 4581796 B2 JP4581796 B2 JP 4581796B2 JP 2005105746 A JP2005105746 A JP 2005105746A JP 2005105746 A JP2005105746 A JP 2005105746A JP 4581796 B2 JP4581796 B2 JP 4581796B2
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JP2005338783A (en
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強 前田
英邦 守屋
圭二 瀧澤
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セイコーエプソン株式会社
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  The present invention relates to a display device and an electronic apparatus.

  Conventionally, a display device has a configuration in which three color dots of R (red) / G (green) / B (blue) are provided in a unit pixel, and the light amounts of the three color dots are made different. Realizes various colors and displays images.

By the way, in the natural world, there is a wavelength region of a color that cannot be displayed by only three colors of R / G / B, and it is difficult to realize a color close to natural light.
Therefore, conventionally, a color video system that can realize a color closer to natural light has been proposed (see, for example, Patent Document 1). In this document, a pixel configuration including three color development portions of R / G / B and a fourth color development portion having color development characteristics in the wavelength range of the red negative sensitivity portion is employed. Since the fourth color forming portion is a color defined outside the triangular region formed by connecting the R / G / B points on the chromaticity diagram, this allows display colors in a wide wavelength range. It can be realized. Further, in this document, there is a description of a receiver that includes a color liquid crystal display in which a large number of four types of coloring portions corresponding to four types of light emitting dots are arranged as a set.
Japanese Patent Laid-Open No. 3-92888

In the technique described in the above-mentioned patent document, display colors in a wide wavelength range can be realized. However, the technique cannot reduce the manufacturing cost of the display device due to an increase in the fourth color developing portion. It was confirmed by the present inventors. That is, by using the above-described technique, although the color expressive power is improved, the cost of the display device is increased, and it cannot be said that the product can be easily manufactured.
The present invention solves such a problem, realizes a very wide color reproduction range, can display an image with a display color in a wide wavelength range closer to natural light, and has a color developing portion in a unit pixel. It is an object of the present invention to provide a display device and an electronic device that can suppress an increase in cost due to increase.

  The present inventor has found that when the above-mentioned patent document is applied to an LCD (Liquid Crystal Display), a backlight having four peak wavelengths is required to develop four colors. In the configuration of the backlight, for example, when a solid light source such as an LED is adopted, it is necessary to use four separate LEDs, and when a fluorescent tube is adopted, four types of fluorescent materials are used. It was necessary to apply in the tube, that is, it was found that the backlight having any configuration of LED and fluorescent tube leads to an increase in cost. Furthermore, it has been found that the adjustment of the current amount in the four color solid light sources and the adjustment of the mixing ratio in the four kinds of fluorescent materials are complicated in the design of the color characteristics of the backlight.

Therefore, the present inventor has come up with the present invention having the following means based on the above.
That is, the display device of the present invention includes a plurality of unit pixels provided with a plurality of light emitting elements that emit illumination light including a plurality of peak wavelengths, and a colored layer and a thin film transistor are provided corresponding to each of the plurality of light emitting elements. In the wavelength selection characteristics, the first colored layer of the plurality of colored layers corresponds to a red wavelength region, the second colored layer corresponds to a blue wavelength region, and the third colored layer is green. Corresponding to the wavelength region, the fourth colored layer corresponds to the cyan wavelength region, the illumination light is applied to the colored layer, and the amount of transmitted light of the colored layer is the light emission corresponding to the colored layer The light emission luminance of the element is controlled by the thin film transistor provided corresponding to the light emitting element, and the number of colored layers in the unit pixel is the number of the plurality of peak wavelengths included in the illumination light. More than There line display image by the number of primary colors of the color layer, the peak wavelength of the wavelength selection characteristics of first colored layer, in the long wavelength side in the wavelength region of visible light, said plurality of peaks included in the illumination light Corresponding to the first peak wavelength of the wavelengths, the peak wavelength of the wavelength selection characteristic of the second colored layer is the short wavelength side of the visible light wavelength region of the plurality of peak wavelengths included in the illumination light Among them, it corresponds to the second peak wavelength, and the peak wavelength of the wavelength selection characteristic of the fourth colored layer does not correspond to the second peak wavelength .

  In the present invention, the “illumination unit” has a function of irradiating illumination light to a color filter unit or a colored layer as an irradiation target. In addition, as one of such “illuminating units”, it functions as an irradiating unit that irradiates illumination light onto the entire surface of the color filter unit, such as a fluorescent tube or LED used in a so-called backlight. In addition to such an “illumination part”, the “illumination part” is composed of a light emitting element (light emitter) such as an organic electroluminescence element (hereinafter referred to as an organic EL element), and includes a plurality of units constituting a unit pixel. It functions as a self-light emitting means for irradiating each colored layer with emitted light.

In addition, “illumination light” means light that illuminates the color filter portion (a plurality of colored layers) or light that has not passed through the color filter portion. Further, the “illumination light” means light that irradiates the color filter unit as synthesized light, or light that irradiates the color filter unit as light in which a plurality of non-synthetic lights are bundled. Further, when the “illumination light” is composed of synthesized light, the “illumination light” includes a plurality of peak wavelengths in the spectral characteristics, and the color thereof is, for example, white light. On the other hand, when the “illumination light” is composed of a plurality of non-synthetic lights, the “illumination light” is light in which a single light in a wavelength region including a peak wavelength less than white light is bundled in a plurality of ways, The plurality of single lights are, for example, light of each color of RGB.
Further, “transmitted light” means light transmitted through the color filter unit or light transmitted through the color filter unit (light after transmission).
In addition, “emission light” is light emitted by the light emitting element by self-emission, and includes a part of wavelengths constituting “illumination light”.

Therefore, in the display device of the present invention, the illumination unit irradiates the color filter unit with illumination light including a plurality of peak wavelengths. The transmitted light amount control unit controls the amount of transmitted light of the color filter unit. As a result, an image is displayed in the primary colors corresponding to the number of colored layers in the unit pixel, and the amount of transmitted light of each colored layer is controlled by the transmitted light amount control unit, so that the light transmitted through each colored layer is synthesized. Then, full color image display is performed. Here, the number of colored layers constituting the unit pixel of the color filter unit is larger than the number of peak wavelengths of spectral characteristics included in the illumination light.
Therefore, by providing a plurality of colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, thereby simplifying the components of the illumination unit. Furthermore, with simplification of the components of the illumination unit, the color characteristic design of the illumination unit can be easily adjusted.

  In the display device, the illuminating unit includes a plurality of light emitting elements corresponding to the plurality of colored layers in a unit pixel, and each of the plurality of light emitting elements includes emitted light having a predetermined peak wavelength. The color filter unit is irradiated with the illumination light composed of a plurality of emitted lights, and the light transmission control unit controls the amount of emitted light in each of the plurality of light emitting elements, Each of the colored layers is characterized by performing wavelength selection of the emitted light and synthesizing light transmitted through the colored layers to obtain the transmitted light.

  Here, the “light emitting element corresponding to the colored layer” means that a correspondence relationship is established in which one colored layer is disposed on the optical path of the emitted light of the one light emitting element. Further, “a plurality of light emitting elements respectively corresponding to a plurality of colored layers” means that the above correspondence is established between the plurality of colored layers and the plurality of light emitting elements.

The light transmission control unit of the present invention sequentially changes the amount of power (current amount and voltage amount) supplied to the light emitting element, and adjusts the amount of light emission (brightness of emitted light) according to the change in the amount of power. In addition, the amount of light transmitted through the color filter portion (colored layer) is controlled.
Examples of such a light transmission control unit include a configuration in which a light emitting element is sandwiched between electrodes facing each other, and a switching element or a drive circuit is connected to one of the electrodes. In this configuration, the amount of power supplied to the light emitting element between the electrodes is controlled by the operation of the switching element and the drive circuit, and the light energy is replaced with light energy in the light emitting element, the light emission amount is controlled, and the light passes through the colored layer. It is possible to control the amount of transmitted light. Then, the light that has been wavelength-selected through each of the plurality of colored layers in the unit pixel is combined to become transmitted light.

  Therefore, according to the present invention, it is possible to select the wavelength by controlling the light amount of the emitted light in each of the light emitting elements by the light transmission amount control unit. As described above, the number of colored layers is greater than the number of peak wavelengths included in the illumination light, in other words, greater than the number of peak wavelengths of the emitted light constituting the illumination light. Therefore, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, thereby simplifying the components of the illumination unit. Furthermore, with simplification of the components of the illumination unit, the color characteristic design of the illumination unit can be easily adjusted.

Further, in the display device, each of the plurality of light emitting elements emits the illumination light to the color filter unit by emitting light with emission light including a plurality of peak wavelengths in spectral characteristics. Yes.
Therefore, according to the present invention, each of the light emitting elements emits light having a plurality of peak wavelengths, and the emitted light enters each of the colored layers corresponding to the light emitting elements. Each colored layer selectively emits light in a predetermined wavelength region out of emitted light including a plurality of peak wavelengths based on wavelength selection characteristics. Thereby, in the unit pixel, transmitted light in which lights in a plurality of wavelength regions are combined is obtained.
Here, “emitted light including a plurality of peak wavelengths” means, for example, white light in which the respective emission colors of RGB are synthesized. Further, since the plurality of colored layers is larger than the number of peak wavelengths in the illumination unit, it is composed of a plurality of colors such as four colors and five colors. For example, C (cyan) or Y (yellow) is added to RGB. Color is adopted.
In this way, it is possible to realize a very wide color reproduction range and display an image with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, thereby simplifying the components of the illumination unit. Furthermore, with simplification of the components of the illumination unit, the color characteristic design of the illumination unit can be easily adjusted.

In the display device, two peak wavelengths respectively included in two colored layers in wavelength selection characteristics correspond to two peak wavelengths included in the illumination light. It is said.
As described above, in the wavelength selection characteristic of the colored layer and the spectral characteristic of the illumination light, the two peak wavelengths correspond to each other so that the corresponding peak wavelength can be displayed in a clear color. .
In the present invention, “the wavelength corresponds” does not mean that the optical design is completely matched, but the wavelengths are set to match the wavelengths or to match. Is meant to do.

In the display device, the two peak wavelengths of each of the two colored layers and the two peak wavelengths included in the illumination light are a long wavelength side and a short wavelength side in the wavelength region of visible light. It is characterized by the fact that the
In this way, in the wavelength selection characteristic of the colored layer and the spectral characteristic of the illumination light, the peak wavelength indicating the R display color and the peak wavelength indicating the B display color correspond to each other. Accordingly, the illumination light having the R and B wavelength wavelengths is not absorbed or attenuated in the colored layer, so that the R and B colors can be displayed with clear colors.

  Moreover, the other two peak wavelengths (peak wavelengths excluding R and B) in the four colored layers and the other one peak wavelength (peak wavelengths excluding R and B) included in the illumination light are: It is located in the wavelength region between the long wavelength side and the short wavelength side. Specifically, the peak wavelengths indicating the display colors Y, G, and C are located between the R and B peak wavelengths. Here, G and colors having wavelengths in the vicinity of G are colors with relatively high visibility compared to R and B, and R and B can be vividly colored as described above. Thus, a full-color image can be displayed with a clear color as a whole of the four-color colored layer.

In the display device, the number of colored layers in the unit pixel is four, the number of peak wavelengths of the illumination light in the illumination unit is three, and image display is performed with four primary colors. It is characterized by.
In this way, by providing four colored layers in the unit pixel, it is possible to realize a very wide color reproduction range and display an image with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light can be 3, so that the components of the illumination unit can be simplified. Furthermore, the color characteristic design can be easily adjusted with the simplification of the components of the illumination unit.

  In the display device, the peak wavelength of the illumination light is located in three regions of 400 to 490 nm, 490 to 570 nm, and 600 nm or more, and the colored layer in the unit pixel is 400 to 490 nm. , 490 to 520 nm, 520 to 570 nm, and 600 nm or more, it has a wavelength selection characteristic consisting of four regions.

Thus, in the wavelength region of 400 to 490 nm and the wavelength region of 600 nm or more, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the colored layer, so that the colors of R and B are displayed with clear color development. can do.
In addition, in the wavelength range of 490 to 520 nm and 520 to 570 nm in the wavelength selection characteristics of the colored layer and the wavelength range of 490 to 570 nm of the illumination light, the peak wavelength of the illumination light corresponds to the wavelength selection characteristics of the color layer. , G and C can be displayed with clear colors. Therefore, since each of R, G, B, and C can be vividly developed, a full color image can be displayed with a clear color.

In addition, since the four colored layers in the unit pixel are R, G, B, and C in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, the region on the left side or the upper left side of the line segment connecting the coordinates of B and G is the region on the upper right side of the line segment connecting the coordinates of G and R, or R and Since this area is larger than the area on the lower right side of the line segment connecting the coordinates of B, this area has a large room for expressing a color closer to natural light. Therefore, by providing the unit pixel with a colored layer having a color coordinate located in the region on the left side or the upper left side of the line segment connecting the coordinates of B and G, that is, a region having a large room for the above The color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.
Further, a display device including four color dots including C in a unit pixel has a wider displayable area in the xy chromaticity characteristics than a display device including other color dots such as Y dots in the unit pixel. Can be.

  In the display device, the peak wavelength of the illumination light is located in three regions of 400 to 490 nm, 520 to 600 nm, and 600 nm or more, and the colored layer in the unit pixel is 400 to 490 nm. , 520 to 570 nm, 570 to 600 nm, and wavelength selection characteristics including four regions of 600 nm or more.

Thus, in the wavelength region of 400 to 490 nm and the wavelength region of 600 nm or more, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the colored layer, so that the colors of R and B are displayed with clear color development. can do.
In addition, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the colored layer in the wavelength range of 520 to 570 nm and 570 to 600 nm in the wavelength selection characteristic of the colored layer and the wavelength range of 520 to 600 nm of the illumination light. , G and Y can be displayed with clear color. Therefore, since each color of R, G, B, and Y can be clearly developed, a full color image display can be performed with a clear color.

In addition, since the four colored layers in the unit pixel are R, G, B, and Y in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, a colored layer having a color coordinate located in a region on the right side or upper right side of a line segment connecting the coordinates of G and R, that is, a Y colored layer is included in a unit pixel. By providing, the color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.

In the display device, the number of colored layers in the unit pixel is 5, the number of peak wavelengths of the illumination light in the illumination unit is 3, and image display is performed with five primary colors. It is characterized by.
In this way, by providing five colored layers in the unit pixel, it is possible to realize a very wide color reproduction range and display an image with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light can be 3, so that the components of the illumination unit can be simplified. Furthermore, the color characteristic design can be easily adjusted with the simplification of the components of the illumination unit.

  In the display device, the peak wavelength of the illumination light is located in three regions of 400 to 490 nm, 490 to 600 nm, and 600 nm or more, and the colored layer in the unit pixel is 400 to 490 nm. , 490 to 520 nm, 520 to 570 nm, 570 to 600 nm, and wavelength selection characteristics including five regions of 600 nm or more.

Thus, in the wavelength region of 400 to 490 nm and the wavelength region of 600 nm or more, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the colored layer, so that the colors of R and B are displayed with clear color development. can do.
In addition, in the wavelength range of 490 to 520 nm, 520 to 570 nm, and 570 to 600 nm in the wavelength selection characteristics of the colored layer, and the wavelength range of 490 to 600 nm of the illumination light, the peak wavelength of the illumination light becomes the wavelength selection characteristic of the color layer. Therefore, G, C, and Y colors can be displayed with clear color. Therefore, since each color of R, G, B, C, and Y can be vividly developed, a full color image display can be performed with clear color development.

In addition, since the five colored layers in the unit pixel are R, G, B, C, and Y in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light. Can be realized.
More specifically, in the xy chromaticity characteristics, the present invention relates to a coloring layer having color coordinates located in a region on the left side or upper left side of a line segment connecting B and G coordinates, and G and R coordinates. And a colored layer having color coordinates located in a region on the right side or upper right side of the connecting line segment. That is, the C and Y colored layers are provided in the unit pixel, and the color reproduction range in an area having a large room can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.

According to another aspect of the invention, an electronic apparatus includes the display device described above.
Examples of such electronic devices include information processing devices such as mobile phones, mobile information terminals, watches, word processors, and personal computers. Moreover, a television having a large display screen, a large monitor, and the like can be exemplified. In this way, by adopting the display device of the present invention in the display unit of the electronic device, not only can the image be displayed in a display color in a wide wavelength range closer to natural light, but also a low-cost electronic device is provided. It becomes possible to do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In all the drawings below, the scales of the respective layers and members are different in order to make each layer and each member recognizable on the drawings.

(Image display system)
First, an image display system provided with the display device of the present invention will be described.
FIG. 1 is a block diagram showing the configuration of the image display system.
As shown in FIG. 1, the image display system 1 includes an input unit 1A and an output unit 1B.
Furthermore, the input unit 1A includes an input sensor 2A, a control circuit 2B, a memory 2C, a signal processing circuit 2D, and an encoding circuit 2E.
The output unit 1B includes a decoding circuit 3A, a control circuit 3B, a memory 3C, a signal processing circuit 3D, a drive circuit 3E, and a display unit (display device) 3F.

  Here, in the input unit 1A, image data is input from the input sensor 2A by photoelectric conversion. The image data is processed by the signal processing circuit 2D via the control circuit 2B and encoded by the encoding circuit 2E. On the other hand, in the output unit 1B, the image data processed in the encoding circuit 2E is decoded in the decoding circuit 3A. Further, after being processed by the signal processing circuit 3D via the control circuit 3B, it is converted into a drive signal by the drive circuit 3E and supplied to the display unit 3F. Note that the data of the control circuits 2B and 3B is appropriately stored in the memories 2C and 3C.

  In addition, as will be described later, the image display system 1 performs color reproduction with four or five primary colors on the display unit 3F. For this reason, the signal processing circuit 3D of the output unit 1B shown in FIG. 1 converts the inputted three primary color image data into four primary color or five primary color image data. Specifically, for example, when image data is input and transmitted as a general three primary color signal, the signal processing circuit 3D performs conversion from the three primary colors to the four primary colors, or conversion from the three primary colors to the five primary colors. Is called. In such conversion of the number of primary colors, a conversion table from the three primary colors to the four primary colors and a conversion table from the three primary colors to the five primary colors are automatically referred to and converted by the table lookup format. ing.

(First Embodiment of Display Unit)
Next, a first embodiment of a display unit according to the display device of the present invention will be described with reference to FIGS. In the present embodiment, a liquid crystal panel is employed as the display unit 3F constituting the image display system 1.
2 is a plan view of each component of the liquid crystal panel viewed from the counter substrate side, FIG. 3 is a perspective view for explaining a cross-sectional configuration of the liquid crystal panel, and FIG. 4 is a plan layout diagram of color filters in the liquid crystal panel. FIG. 5 is a diagram showing color filter wavelength selection characteristics, backlight spectral characteristics, pixel partial light characteristics, and xy chromaticity characteristics of the liquid crystal panel in the liquid crystal panel.

As shown in FIG. 2, in the liquid crystal panel (display device) 3F, the TFT array substrate 10A and the counter substrate 10B are bonded together by a sealing material 52, and the liquid crystal layer 11 is enclosed in a region partitioned by the sealing material 52. ing. A light-shielding film (peripheral parting) 53 made of a light-shielding material is formed in an inner region of the sealing material 52 formation region. In the peripheral circuit area outside the sealing material 52, a data line driving circuit 201 and an external circuit mounting terminal 202 are formed along one side of the TFT array substrate 10A, and scanning lines are formed along two sides adjacent to the one side. A drive circuit 104 is formed. On the remaining one side of the TFT array substrate 10A, a plurality of wirings 105 are provided for connecting between the scanning line driving circuits 104 provided on both sides of the display area. In addition, an inter-substrate conductive material 106 for providing electrical continuity between the TFT array substrate 10A and the counter substrate 20 is disposed at a corner portion of the counter substrate 10B.
Accordingly, the liquid crystal panel 3F is an active matrix transmissive liquid crystal panel using thin film transistors (hereinafter abbreviated as TFTs) as switching elements.

As shown in FIG. 3, a pixel electrode 15 is formed inside the TFT array substrate 10A, and a common electrode 16 is formed inside the counter substrate 10B. Further, a color filter 12 is formed between the counter substrate 10 </ b> B and the common electrode 16.
Further, a backlight unit 13 and upper and lower polarizing plates 14A and 14B are formed outside the TFT array substrate 10A and the counter substrate 10B.
In the present embodiment, “inner side” means the side where the liquid crystal layer 11 is formed, and “outer side” means the side where the liquid crystal layer 11 is not disposed.

Here, each component will be described.
The TFT array substrate 10A and the counter substrate 10B are made of a transparent substrate such as glass or plastic.
The pixel electrode 15 and the common electrode 16 are formed of a transparent conductor such as ITO (indium tin oxide). Further, the pixel electrode 15 is connected to a TFT (Thin Film Transistor) circuit (not shown) provided on the TFT array substrate 10A, and between the common electrode 16 and the pixel electrode 15 according to switching driving of the TFT. A voltage is applied to the liquid crystal layer 11.

The liquid crystal layer 11 functions as a light transmission control unit of the present invention.
The liquid crystal layer 11 includes liquid crystal molecules whose arrangement changes according to the voltage value applied by the common electrode 16 and the pixel electrode 15. In the present embodiment, a TN (Twisted Nematic) mode in which the TFT array substrate 10A and the counter substrate 10B are twisted by 90 degrees is employed as the liquid crystal mode.
Further, the upper and lower polarizing plates 14A and 14B are arranged so that their transmission axes are orthogonal to each other.
In such a liquid crystal layer 11 and the upper and lower polarizing plates 14A and 14B, the alignment of the liquid crystal molecules changes according to the voltage value applied to the liquid crystal layer 11, so that the liquid crystal layer 11 and the upper and lower polarizing plates 14A and 14B are transmitted. The amount of light to be changed is changed. Accordingly, the liquid crystal layer 11 transmits or blocks the illumination light on its optical path with respect to the illumination light having a substantially constant light amount, and adjusts the amount of transmission to each colored layer of the color filter 12. Is used to control the amount of transmitted light. The liquid crystal layer 11 performs wavelength selection by controlling the amount of illumination light transmitted through the liquid crystal layer 11 in each of the plurality of colored layers in the unit pixel. Thereby, it becomes possible to synthesize | combine the light which permeate | transmitted each colored layer and to obtain the transmitted light.

  Note that the liquid crystal mode of the liquid crystal layer 11 is not limited to the TN mode. For example, an STN (Super Twisted Nematic) mode, a VA (Vertical Aligned) mode, an IPS (In-Plain Switching) mode, or the like may be employed. In this embodiment, the switching element that applies a voltage to the liquid crystal 11 is not limited to the TFT. For example, TFD (Thin Film Diode) may be adopted. Further, in addition to active elements such as TFT and TFD, passive elements may be employed.

Next, the configuration of the color filter 12 will be described.
FIG. 4A shows a color filter 12 in which one pixel is constituted by four colored layers, and a pixel configuration comprising a four-color colored layer in which a C colored layer is added to an RGB three-color colored layer. Is shown. Accordingly, each colored layer of BGRC is irradiated with the illumination light of the backlight unit 13 so that light of a predetermined wavelength region included in the illumination light, in other words, a predetermined color, is transmitted to the viewer side. It has become. Further, it is assumed that the color filter 12 having such a configuration is disposed on the entire display area of the liquid crystal panel 3F shown in FIG.
FIG. 5A shows the wavelength selection characteristics of the color filter 12. As shown in FIG. 5A, the wavelength selection characteristics of the four-color colored layers of B (Blue), C (Cyan), G (Green), and R (Red) are from the short wavelength side to the long wavelength side of visible light. It is distributed in order. Therefore, the color filter 12 transmits the illumination light of the backlight unit 13 at four peak wavelengths in a wavelength selective manner.

  A known method is employed as a method for manufacturing such a color filter 12. For example, a method of forming each colored layer of B, C, G, and R by exposing and developing a resist applied and formed by using a photolithography technique can be given. Further, there is a method in which each material of B, C, G, and R is ejected and formed in a predetermined pattern from an ejection head filled with various liquid materials by using an inkjet method. Moreover, the method of forming the color filter 12 by dye | staining each of B, C, G, and R is mentioned.

  Further, when four colors of BGRC are arranged by the stripe type, a degree of freedom occurs in the order of arrangement (in the case of three colors, there is no degree of freedom due to periodicity and symmetry in any order). FIG. 4 shows an example of arrangement from the left in the order of BGRC, but in addition to this order, several orders such as BCGR are conceivable. However, when looking at the spectral characteristics, since it is a macroscopic viewpoint, the arrangement order of the pixels does not have to be taken into consideration. Further, the BGRC may be arranged in the unit pixel not only by the stripe type array but also by a delta type array or a mosaic array.

Next, the configuration of the backlight unit 13 will be described.
The backlight unit 13 functions as an illumination unit of the present invention. The backlight unit 13 irradiates the liquid crystal layer 11 with illumination light including a plurality of peak wavelengths in the spectral characteristics with the same amount of light. It has a function of irradiating illumination light to the colored layer of the color filter 12 as an irradiation target. Such a backlight unit 13 is composed of a light source and a light guide plate, and uniformly spreads the light emitted from the light source inside the light guide plate, and emits the light source light in the direction indicated by symbol A. The light source is a fluorescent tube type CCFL, and a plurality of types of fluorescent materials are applied in the fluorescent tube. Further, desired spectral characteristics can be obtained by adjusting the mixing ratio of the fluorescent materials. The light guide plate is made of a resin such as acrylic.
In the present embodiment, the color filter 12 is transmitted after passing through the liquid crystal layer 11 on the optical path of the illumination light, but the positional relationship between the liquid crystal layer 11 and the color filter 12 is reversed. It may be a configuration.

The liquid crystal panel 3F having such a configuration is a transmissive liquid crystal panel that emits the light emitted from the backlight unit 13 toward the symbol A and extracts the light from the counter substrate 10B side. Therefore, liquid crystal display is performed using the light source light of the backlight unit 13.
FIG. 5B shows the spectral characteristics of the backlight unit 13. As shown in FIG. 5B, the spectral characteristics of the illumination light emitted from the backlight unit 13 are B (Blue), G (Green), and R (from the short wavelength side to the long wavelength side of visible light. Red). Thus, the peak wavelength of the illumination light of the backlight unit 13 is three, which is smaller than the number of four peak wavelengths in the wavelength selection characteristic of the color filter 12.

Furthermore, as shown in (Table 1), the peak wavelengths in the spectral characteristics of the illumination light of the backlight unit 13 (see (b) in Table 1) are 400 to 490 nm, 490 to 570 nm, and 600 nm or more, In addition, the wavelength selection characteristics (see (a) in Table 1) of the color filter 12 are four wavelengths of 400 to 490 nm, 490 to 520 nm, 520 to 570 nm, and 600 nm or more. Located in the area.
Here, the region of 400 to 490 nm and the region of 600 nm or more are wavelengths indicating the colors of B and R, respectively, and are wavelengths on the short wavelength side and the long wavelength side of visible light. And in the said 400-490 nm area | region and a 600 nm or more area | region, the spectral characteristic of the illumination light of the backlight unit 13 and the wavelength selection characteristic of a colored layer correspond.

Further, in the wavelength selection characteristics of the colored layer, the region of 490 to 520 nm and the region of 520 to 570 nm are wavelengths indicating C and G colors. Further, in the spectral characteristics of the illumination light of the backlight unit 13, the region of 490 to 570 nm has a wavelength indicating G color. As described above, the colors C and G of the colored layer are displayed by the light having the wavelength indicating the color G included in the illumination light.
Here, the region (G) of 520 to 570 nm in the wavelength selection characteristics of the colored layer and the region (G) of 490 to 570 nm in the spectral characteristics of the illumination light are set so as to be approximately the same. In addition, the region (C) of 490 to 520 nm in the wavelength selection characteristic of the colored layer is acceptable even if it does not coincide with the peak wavelength of the spectral characteristic of the illumination light.

In the image display system 1 configured as described above, image data input to the input sensor 2A is transmitted to the control circuits 2B and 3B, the signal processing circuits 2D and 3D, the encoding circuit 2E, the decoding circuit 3A, and the driving circuit 3E. Then, it is output to the liquid crystal panel 3F.
Specifically, in the liquid crystal panel 3F, the illumination light of the backlight unit 13 irradiates the four-color colored layer of the color filter 12. Here, the illumination light includes a wavelength according to the spectral characteristics.
The liquid crystal layer 11 controls the amount of light transmitted through the color filter 12. As a result, as shown in FIG. 5C, an image is displayed in the number of primary colors of the colored layer in the unit pixel, that is, four colors of BCGR. Since the amount of light transmitted through each colored layer is controlled by the liquid crystal layer 11, the light transmitted through each colored layer is combined and a full color image display is performed.

  Further, as shown in FIG. 5C, the spectral characteristics of the C colored layer have a distribution including both the spectral characteristics of B and G of the illumination light of the backlight unit 13. Therefore, in the prior art document, a single peak value peculiar to C appears in the spectral characteristics, but in this embodiment, a single peak value peculiar to C does not appear.

  Next, referring to FIG. 5D, a liquid crystal panel having four color (4CF) colored layers in the unit pixel and a liquid crystal panel having three colored RGB (3CF) colored layers are compared. The xy chromaticity characteristics will be described. The pixel configuration of the three-color coloring layer can realize the color of the triangular region of the xy chromaticity characteristics, but the pixel configuration of the four-color coloring layer can realize the color of the square region of the xy chromaticity characteristics. Is possible. Therefore, the liquid crystal panel 3F of the present embodiment in the pixel configuration of the four-color coloring layer can realize a wide color gamut.

As described above, in the present embodiment, the number of colored layers constituting the unit pixel of the color filter 12 is larger than the number of peak wavelengths of spectral characteristics included in the illumination light. That is, the number of colored layers is four, and the number of peak wavelengths of spectral characteristics is three.
Therefore, by providing four colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, so that the components of the backlight unit 13 can be simplified. Furthermore, with simplification of the components of the backlight unit 13, the color characteristic design of the backlight unit 13 can be easily adjusted.

Moreover, since the peak wavelength of the wavelength selection characteristics of R and B in the colored layer corresponds to the peak wavelength of the spectral characteristics of R and B included in the illumination light, the illumination light having the wavelengths of R and B is colored. Since it does not absorb or attenuate in the layer, the colors of R and B can be displayed in clear color.
In addition, thereby, the wavelength selection characteristics of C and G in the colored layer and the spectral characteristics of G in the illumination light are located in the R and B wavelength regions. G and C are colors with relatively high visibility compared to R and B. Since R and B can be vividly colored as described above, a full color image display can be performed with clear color development as a whole of the four-color colored layer.

In addition, the peak wavelength of illumination light in the spectral characteristics is located in three regions of 400 to 490 nm, 490 to 570 nm, and 600 nm or more, and the colored layers in the unit pixel are 400 to 490 nm, 490 to 520 nm, Since it has wavelength selection characteristics consisting of four regions of 520 to 570 nm and 600 nm or more, the peak wavelength in the spectral characteristics of the illumination light corresponds to the wavelength selection characteristics of the colored layer, and R and B Can be displayed in a clear color.
In addition, in the wavelength range of 490 to 520 nm and 520 to 570 nm in the wavelength selection characteristic of the colored layer and the wavelength range of 490 to 570 nm in the spectral characteristic of the illumination light, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the color layer. Therefore, the colors G and C can be displayed with clear color. Therefore, since each of R, G, B, and C can be vividly developed, a full color image can be displayed with a clear color.

In addition, since the four colored layers in the unit pixel are R, G, B, and C in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, the region on the left side or the upper left side of the line segment connecting the coordinates of B and G is the region on the upper right side of the line segment connecting the coordinates of G and R, or R and Since this area is larger than the area on the lower right side of the line segment connecting the coordinates of B, this area has a large room for expressing a color closer to natural light. Therefore, a region having a large room is provided by including a colored layer having a color coordinate located in a region on the left side or upper left side of a line segment connecting the coordinates of B and G, that is, a colored layer of C in the unit pixel. The color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.
Furthermore, the liquid crystal panel 3F having a four-color colored layer containing C in a unit pixel has a display in xy chromaticity characteristics as compared with a liquid crystal panel having another color colored layer such as a Y colored layer in the unit pixel. The possible area can be widened.

Further, the backlight unit 13 has a configuration for irradiating the color filter 12 with illumination light using a fluorescent tube. Thus, in the backlight unit 13 using a fluorescent tube, it is not necessary to apply four types of fluorescent materials in the fluorescent tube, and the backlight unit 13 is formed by applying three types of fluorescent materials (RGB) in the tube. Therefore, the fluorescent tube has a simple configuration as compared with the case where four types of fluorescent materials are applied, and the cost of the backlight unit 13 can be suppressed. Further, color adjustment can be facilitated in the color characteristic design of the backlight unit 13.
Therefore, as described above, a very wide color reproduction range can be realized, display colors in a wide wavelength range closer to natural light can be realized, and an increase in cost of the backlight unit 13 can be suppressed.

  Although the transmissive liquid crystal panel has been described in the above embodiment, a configuration in which a color filter 12 having a four-color colored layer in a unit pixel is employed in a reflective or transflective liquid crystal panel. May be.

(Second Embodiment of Display Unit)
Next, a second embodiment of the display unit according to the display device of the present invention will be described with reference to FIG. In the present embodiment, a liquid crystal panel is employed as the display unit 3F constituting the image display system 1.
FIG. 6 is a diagram illustrating color filter wavelength selection characteristics, backlight spectral characteristics, pixel partial light characteristics, and xy chromaticity characteristics of the liquid crystal panel in the liquid crystal panel.

The liquid crystal panel according to the first embodiment already described has a structure in which four color layers of BCGR are provided in a unit pixel. However, the liquid crystal panel according to the present embodiment has a color of C constituting the color filter 12. Instead of the layer, a BGYR four-color colored layer employing a Y colored layer is provided. In addition, the spectral characteristics of the backlight unit 13 in the present embodiment are different from those in the first embodiment.
In the following description, a configuration different from that of the first embodiment will be described, and the same configuration is denoted by the same reference numeral and description thereof is omitted.

First, the configuration of the color filter 12 provided in the liquid crystal panel of the present embodiment will be described.
The color filter 12 has a pixel configuration including a four-color colored layer in which a Y-colored layer is added to an RGB three-color colored layer. Therefore, each colored layer of BGRY is irradiated with illumination light from the backlight unit 13 so that light of a predetermined wavelength region included in the illumination light, in other words, a predetermined color, is transmitted to the viewer side. It has become.
FIG. 6A shows the wavelength selection characteristics of the color filter 12. As shown in FIG. 6A, the wavelength selection characteristics of the four-color colored layers of B (Blue), G (Green), Y (Yellow), and R (Red) are from the short wavelength side to the long wavelength side of visible light. It is distributed in order. Therefore, the color filter 12 transmits the illumination light of the backlight unit 13 at four peak wavelengths in a wavelength selective manner.

Next, the configuration of the backlight unit 13 provided in the liquid crystal panel of the present embodiment will be described.
FIG. 6B shows the spectral characteristics of the backlight unit 13. As shown in FIG. 6 (b), the spectral characteristics of the illumination light emitted from the backlight unit 13 are B (Blue), G (Green), and R (from the short wavelength side to the long wavelength side of visible light. Red). Thus, the peak wavelength of the illumination light of the backlight unit 13 is three, which is smaller than the number of four peak wavelengths in the wavelength selection characteristic of the color filter 12.

Furthermore, as shown in (Table 2), the peak wavelengths in the spectral characteristics of the illumination light of the backlight unit 13 (see (b) in Table 2) are 400 to 490 nm, 520 to 600 nm, and 600 nm or more, The wavelength selection characteristics (see (a) in Table 2) of the color filter 12 are four wavelengths of 400 to 490 nm, 520 to 570 nm, 570 to 600 nm, and 600 nm or more. Located in the area.
Here, the region of 400 to 490 nm and the region of 600 nm or more are wavelengths indicating the colors of B and R, respectively, and are wavelengths on the short wavelength side and the long wavelength side of visible light. And in the said 400-490 nm area | region and a 600 nm or more area | region, the spectral characteristic of the illumination light of the backlight unit 13 and the wavelength selection characteristic of a colored layer correspond.

  Furthermore, in the wavelength selection characteristics of the colored layer, the region of 520 to 570 nm and the region of 570 to 600 nm have wavelengths indicating G and Y colors. Further, in the spectral characteristics of the illumination light of the backlight unit 13, the region of 520 to 600 nm has a wavelength indicating G color. As described above, the G and Y colors of the colored layer are displayed by the light having the wavelength indicating the color G included in the illumination light.

In the liquid crystal panel 3F including such a color filter 12 and the backlight unit 13, when the illumination light of the backlight unit 13 irradiates the four-color colored layer of the color filter 12, the spectral characteristics shown in FIG. .
As shown in FIG. 6C, the liquid crystal panel 3F displays an image with the number of primary colors of the colored layer in the unit pixel, that is, four colors of BCGR. Since the amount of light transmitted through each colored layer is controlled by the liquid crystal layer 11, the light transmitted through each colored layer is combined and a full color image display is performed. Then, as shown in FIG. 6C, the spectral characteristics of the Y colored layer have a distribution including the spectral characteristics of both G and R of the illumination light of the backlight unit 13.

  Next, referring to FIG. 6D, a liquid crystal panel having four color (4CF) colored layers in the unit pixel is compared with a liquid crystal panel having RGB three color (3CF) colored layers. The xy chromaticity characteristics will be described. The pixel configuration of the three-color coloring layer can realize the color of the triangular region of the xy chromaticity characteristics, but the pixel configuration of the four-color coloring layer can realize the color of the square region of the xy chromaticity characteristics. Is possible. Therefore, the liquid crystal panel 3F of the present embodiment in the pixel configuration of the four-color coloring layer can realize a wide color gamut.

  Further, when the xy chromaticity characteristics of the first embodiment and this embodiment are compared, in the first embodiment, C having color coordinates located in the region on the left side or the upper left side of the line segment connecting the coordinates of B and G. Although the color reproduction range is increased by the colored layer, in this embodiment, the color reproduction range is increased by the Y colored layer having color coordinates located in the region on the right side or upper right side of the line segment connecting the coordinates of G and R. It is getting bigger.

As described above, in the present embodiment, the number of colored layers constituting the unit pixel of the color filter 12 is larger than the number of peak wavelengths of spectral characteristics included in the illumination light, as in the first embodiment. The number of layers is four, and the number of peak wavelengths of spectral characteristics is three.
Therefore, by providing four colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, so that the components of the backlight unit 13 can be simplified. Furthermore, with simplification of the components of the backlight unit 13, the color characteristic design of the backlight unit 13 can be easily adjusted.

Moreover, since the peak wavelength of the wavelength selection characteristics of R and B in the colored layer corresponds to the peak wavelength of the spectral characteristics of R and B included in the illumination light, the illumination light having the wavelengths of R and B is colored. Since it does not absorb or attenuate in the layer, the colors of R and B can be displayed in clear color.
Further, the G and Y wavelength selection characteristics in the colored layer and the G spectral characteristics in the illumination light are located in the R and B wavelength regions. G and Y are colors with relatively high visibility compared to R and B. Since R and B can be vividly colored as described above, a full color image display can be performed with clear color development as a whole of the four-color colored layer.

Moreover, the peak wavelength of the illumination light in the spectral characteristics is located in three regions of 400 to 490 nm, 520 to 600 nm, and 600 nm or more, and the colored layers in the unit pixel are 400 to 490 nm, 520 to 570 nm, Since it has wavelength selection characteristics consisting of four regions of 570 to 600 nm and 600 nm or more, the peak wavelength in the spectral characteristics of the illumination light corresponds to the wavelength selection characteristics of the colored layer, and R and B Can be displayed in a clear color.
In addition, in the wavelength range of 520 to 570 nm and 570 to 600 nm in the wavelength selection characteristic of the colored layer and the wavelength range of 520 to 600 nm in the spectral characteristic of the illumination light, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the color layer. Therefore, the G and Y colors can be displayed with clear color. Therefore, since each color of R, G, B, and Y can be clearly developed, a full color image display can be performed with a clear color.

In addition, since the four colored layers in the unit pixel are R, G, B, and Y in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, a colored layer having a color coordinate located in a region on the right side or upper right side of a line segment connecting the coordinates of G and R, that is, a Y colored layer is included in a unit pixel. By providing, the color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.

Further, the backlight unit 13 has a configuration for irradiating the color filter 12 with illumination light using a fluorescent tube. Thus, in the backlight unit 13 using a fluorescent tube, it is not necessary to apply four types of fluorescent materials in the fluorescent tube, and the backlight unit 13 is formed by applying three types of fluorescent materials (RGB) in the tube. Therefore, the fluorescent tube has a simple configuration as compared with the case where four types of fluorescent materials are applied, and the cost of the backlight unit 13 can be suppressed. Further, color adjustment can be facilitated in the color characteristic design of the backlight unit 13.
Therefore, as described above, a very wide color reproduction range can be realized, display colors in a wide wavelength range closer to natural light can be realized, and an increase in cost of the backlight unit 13 can be suppressed.

  Although the transmissive liquid crystal panel has been described in the above embodiment, a configuration in which a color filter 12 having a four-color colored layer in a unit pixel is employed in a reflective or transflective liquid crystal panel. May be.

(Third embodiment of display unit)
Next, a third embodiment of a display unit according to the display device of the present invention will be described with reference to FIGS. In the present embodiment, a liquid crystal panel is employed as the display unit 3F constituting the image display system 1.
FIG. 7 is a diagram illustrating color filter wavelength selection characteristics, backlight spectral characteristics, pixel partial light characteristics, and xy chromaticity characteristics of the liquid crystal panel in the liquid crystal panel.

The liquid crystal panels in the first and second embodiments already described are configured to include four colored layers of BCGR or BGYR in a unit pixel. However, the liquid crystal panel in the present embodiment includes a color filter 12. However, it is the structure provided with the coloring layer of five colors of BCGYR which employ | adopted C and Y together.
In addition, the spectral characteristics of the backlight unit 13 in the present embodiment are different from those in the first embodiment.
In the following description, configurations different from those of the first and second embodiments will be described, and the same configurations are denoted by the same reference numerals and description thereof is omitted.

First, the configuration of the color filter 12 provided in the liquid crystal panel of the present embodiment will be described.
FIG. 4B shows a color filter 12 in which one pixel is constituted by five colored layers, and is composed of a five-color colored layer in which a C and Y colored layer is added to an RGB three-color colored layer. A pixel configuration is shown. Therefore, each colored layer of BGRCY is irradiated with the illumination light of the backlight unit 13 so as to transmit light of a predetermined wavelength region included in the illumination light, that is, a predetermined color, to the viewer side. It has become. Further, it is assumed that the color filter 12 having such a configuration is disposed on the entire display area of the liquid crystal panel 3F shown in FIG.
FIG. 7A shows the wavelength selection characteristics of the color filter 12. As shown in FIG. 7A, the wavelength selection characteristics of the five-color colored layers of B (Blue), C (Cyan), G (Green), Y (Yellow), and R (Red) are short wavelengths of visible light. It is distributed in order from the side toward the long wavelength side. Therefore, the color filter 12 transmits the illumination light of the backlight unit 13 in a wavelength selective manner at five peak wavelengths.

Next, the configuration of the backlight unit 13 provided in the liquid crystal panel of the present embodiment will be described.
FIG. 7B shows the spectral characteristics of the backlight unit 13. As shown in FIG. 7 (b), the spectral characteristics of the illumination light emitted from the backlight unit 13 are B (Blue), G (Green), and R (from the short wavelength side to the long wavelength side of visible light. Red). Thus, the peak wavelength of the illumination light of the backlight unit 13 is 3, which is smaller than the number of 5 peak wavelengths in the wavelength selection characteristic of the color filter 12.

Furthermore, as shown in (Table 3), the peak wavelengths in the spectral characteristics of the illumination light of the backlight unit 13 (see (b) in Table 3) are 400 to 490 nm, 490 to 600 nm, and 600 nm or more, In addition, the wavelength selection characteristics of the color filter 12 (see (a) in Table 3) are 400 to 490 nm, 490 to 520 nm, 520 to 570 nm, 570 to 600 nm, and 600 nm or more, Are located in the five regions.
Here, the region of 400 to 490 nm and the region of 600 nm or more are wavelengths indicating the colors of B and R, respectively, and are wavelengths on the short wavelength side and the long wavelength side of visible light. And in the said 400-490 nm area | region and a 600 nm or more area | region, the spectral characteristic of the illumination light of the backlight unit 13 and the wavelength selection characteristic of a colored layer correspond.

  Furthermore, in the wavelength selection characteristics of the colored layer, the region of 490 to 520 nm, the region of 520 to 570 nm, and the region of 570 to 600 nm are wavelengths indicating C, G, and Y colors. Further, in the spectral characteristics of the illumination light of the backlight unit 13, the region of 490 to 600 nm has a wavelength indicating G color. As described above, the colors C, G, and Y of the colored layer are displayed by the light having the wavelength indicating the color G included in the illumination light.

In the liquid crystal panel 3F including such a color filter 12 and the backlight unit 13, when the illumination light of the backlight unit 13 irradiates the five-color colored layer of the color filter 12, the spectral characteristics shown in FIG. .
As shown in FIG. 7C, the liquid crystal panel 3F displays an image with the number of primary colors of the colored layer in the unit pixel, that is, five colors of BCGR. Since the amount of light transmitted through each colored layer is controlled by the liquid crystal layer 11, the light transmitted through each colored layer is combined and a full color image display is performed. Then, as shown in FIG. 7C, the spectral characteristic of the C colored layer has a distribution including the spectral characteristics of both B and G of the illumination light of the backlight unit 13, and the spectral characteristic of the Y colored layer is The distribution includes the spectral characteristics of both G and R of the illumination light of the backlight unit 13.

  Next, referring to FIG. 7D, a liquid crystal panel having five color (5CF) colored layers in the unit pixel and a liquid crystal panel having three RGB (3CF) colored layers are compared. The xy chromaticity characteristics will be described. In the pixel configuration of the three-color coloring layer, it is possible to realize the color of the triangular region having the xy chromaticity characteristics, but in the pixel configuration of the five-color coloring layer, the color of the pentagonal region having the xy chromaticity characteristics is realized. Is possible. Therefore, the liquid crystal panel 3F of the present embodiment in the pixel configuration of the five-color coloring layer can realize a wide color gamut.

Further, when the xy chromaticity characteristics of the first and second embodiments and this embodiment are compared, in the first embodiment, the color coordinates located in the region on the left side or the upper left side of the line segment connecting the coordinates of B and G. The color reproduction range is increased by the C colored layer having, and in the second embodiment, the color reproduction is performed by the Y colored layer having the color coordinates located in the region on the right side or upper right side of the line segment connecting the G and R coordinates. The range is getting bigger.
On the other hand, this embodiment has both the characteristics of the first and second embodiments in the color reproduction range. That is, a colored layer of C having a color coordinate located in a region on the left side or upper left side of a line segment connecting B and G coordinates, and a region on the right side or upper right side of a line segment connecting G and R coordinates. The color reproduction range is increased by the Y colored layer having the color coordinates located. Therefore, the color reproduction range is larger than in the first and second embodiments.

As described above, in the present embodiment, the number of colored layers constituting the unit pixel of the color filter 12 is larger than the number of peak wavelengths of spectral characteristics included in the illumination light, and the number of colored layers is five. The number of peak wavelengths of spectral characteristics is three.
Therefore, by providing five colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, so that the components of the backlight unit 13 can be simplified. Furthermore, with simplification of the components of the backlight unit 13, the color characteristic design of the backlight unit 13 can be easily adjusted.

Moreover, since the peak wavelength of the wavelength selection characteristics of R and B in the colored layer corresponds to the peak wavelength of the spectral characteristics of R and B included in the illumination light, the illumination light having the wavelengths of R and B is colored. Since it does not absorb or attenuate in the layer, the colors of R and B can be displayed in clear color.
In addition, thereby, the wavelength selection characteristics of C, G, and Y in the colored layer and the spectral characteristics of G in the illumination light are located in the R and B wavelength regions. C, G, and Y are colors with relatively high visibility compared to R and B. Since R and B can be vividly colored as described above, full-color image display can be performed with clear color development as a whole of the five-color colored layer.

The peak wavelength of illumination light in the spectral characteristics is located in three regions of 400 to 490 nm, 490 to 600 nm, and 600 nm or more, and the colored layers in the unit pixel are 400 to 490 nm, 490 to 520 nm, Since it has wavelength selection characteristics consisting of five regions of 520 to 570 nm, 570 to 600 nm, and 600 nm or more, the peak wavelength in the spectral characteristics of the illumination light corresponds to the wavelength selection characteristics of the colored layer. , R and B can be displayed with clear color.
In addition, in the wavelength range of 490 to 520 nm, 520 to 570 nm and 570 to 600 nm in the wavelength selection characteristics of the colored layer, and the wavelength range of 490 to 600 nm in the spectral characteristics of the illumination light, the peak wavelength of the illumination light is the wavelength selection of the colored layer. Since it corresponds to the characteristic, C, G, and Y colors can be displayed with clear color. Therefore, since each of R, G, B, Y, and C can be clearly developed, a full color image can be displayed with a clear color.

In addition, since the four colored layers in the unit pixel are R, G, B, Y, and C in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light. Can be realized.
More specifically, in the present embodiment, in the xy chromaticity characteristics, a colored layer having color coordinates located in a region on the left side or the upper left side of the line segment connecting the coordinates of B and G, and G and R And a colored layer having color coordinates located in a region on the right side or the upper right side of the line segment connecting the coordinates. That is, the C and Y colored layers are provided in the unit pixel, and the color reproduction range in an area having a large room can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.

Further, the backlight unit 13 has a configuration for irradiating the color filter 12 with illumination light using a fluorescent tube. Thus, in the backlight unit 13 using a fluorescent tube, it is not necessary to apply five types of fluorescent materials in the fluorescent tube, and the backlight unit 13 is formed by applying three types of fluorescent materials (RGB) in the tube. Therefore, the fluorescent tube has a simple configuration as compared with the case where five types of fluorescent materials are applied, and the cost increase of the backlight unit 13 can be suppressed. Further, color adjustment can be facilitated in the color characteristic design of the backlight unit 13.
Therefore, as described above, a very wide color reproduction range can be realized, display colors in a wide wavelength range closer to natural light can be realized, and an increase in cost of the backlight unit 13 can be suppressed.

  In the above embodiment, the transmissive liquid crystal panel has been described. However, in the reflective or transflective liquid crystal panel, a configuration including a color filter 12 having a five-color colored layer in a unit pixel is employed. May be.

(4th Embodiment of a display part)
Next, a fourth embodiment of a display unit according to the display device of the present invention will be described with reference to FIG. In the present embodiment, a liquid crystal panel is employed as the display unit 3F constituting the image display system 1.
8A shows the color filter wavelength selection characteristic in the liquid crystal panel, FIG. 8B shows the backlight spectral characteristic, and FIG. 8C shows the xy chromaticity characteristic of the liquid crystal panel. Yes.

In the liquid crystal panels of the first to fourth embodiments described above, the peak wavelength of the illumination light of the backlight unit 13 is three, and the peak selection wavelength of the color filter 12 has four or five peak wavelengths. It is less than the number.
In the present embodiment, a case where the number of peak wavelengths is two will be described.
In the following description, configurations different from those of the first to third embodiments will be described, and the same reference numerals are given to the same configurations, and description thereof will be omitted.

First, the configuration of the color filter 12 provided in the liquid crystal panel of the present embodiment will be described.
The color filter 12 has a pixel configuration including a four-color colored layer in which a C colored layer is added to an RGB three-color colored layer. Accordingly, each colored layer of BGRC is irradiated with the illumination light of the backlight unit 13 so that light of a predetermined wavelength region included in the illumination light, in other words, a predetermined color, is transmitted to the viewer side. It has become.
FIG. 8A shows the wavelength selection characteristics of the color filter 12. As shown in FIG. 8A, the wavelength selection characteristics of the four-color colored layers of B (Blue), C (Cyan), G (Green), and R (Red) are from the short wavelength side to the long wavelength side of visible light. It is distributed in order. Therefore, the color filter 12 transmits the illumination light of the backlight unit 13 at four peak wavelengths in a wavelength selective manner.
Further, in the color filter 12 in the present embodiment, as shown in FIG. 8A, the transmittances of B and C are substantially equal. The characteristic of the color filter 12 is different because the additive color material is different.

Next, the configuration of the backlight unit 13 provided in the liquid crystal panel of the present embodiment will be described.
FIG. 8B shows the spectral characteristics of the backlight unit 13. In the present embodiment, a backlight with wavelength conversion is used. That is, as shown in FIG. 8B, by irradiating the fluorescent material with light having an original peak wavelength of 450 nm, a part of the light with a peak wavelength of 450 nm has a relatively broad luminance distribution with a peak wavelength of 565 nm. It is converted to light. As a result, both have a peak wavelength of 450 nm before conversion and a peak wavelength of 565 nm after conversion. Thereby, the spectral characteristic of the illumination light emitted from the backlight unit 13 has two peak wavelengths from the short wavelength side to the long wavelength side of the visible light, and is 4 in the wavelength selection characteristic of the color filter 12. It is less than the number of peak wavelengths.

Next, referring to FIG. 8C, a liquid crystal panel having four color (4CF) colored layers in the unit pixel and a liquid crystal panel having three colored RGB (3CF) colored layers are compared. The xy chromaticity characteristics will be described.
As shown in FIG. 8C, the xy chromaticity characteristics of the present embodiment are similar to those of the first embodiment, even when the spectral characteristics of the backlight unit 13 have two peak wavelengths. With the pixel configuration of the four-color colored layer, it is possible to realize the color of the rectangular region having the xy chromaticity characteristics. In addition, a wide color gamut can be realized as compared with the pixel configuration of the three-color colored layer.
Therefore, also in this embodiment, the same effect as the above-described embodiment can be obtained.

(Fifth Embodiment of Display Unit)
Next, a fifth embodiment of the present invention will be described with reference to FIG.
5th Embodiment demonstrates the case where the light source of the backlight unit 13 is changed, without changing the structure in the unit pixel of the color filter 12, ie, without changing the structure of the colored layer of BCGR. In the first embodiment, a case where a three-wavelength fluorescent tube type backlight unit is used has been described, but in this embodiment, a case where a three-color LED (solid light source) type backlight unit is used will be described.
In the present embodiment, the same components as those in the above-described embodiments are denoted by the same reference numerals, and the description will be simplified.

  FIG. 9 is a diagram illustrating color filter wavelength selection characteristics, backlight spectral characteristics, pixel partial light characteristics, and xy chromaticity characteristics of a liquid crystal panel. Here, the color filter wavelength selection characteristics are the same as those of the first embodiment described above.

Next, the configuration of the backlight unit 13 of the present embodiment will be described.
The backlight unit 13 includes a three-color LED as a light source. The backlight unit 13 using the three-wavelength fluorescent tube of the first embodiment has three typical peaks, and has spectral characteristics (see FIG. 5B, FIG. 6B, and FIG. 7B). In contrast to the discontinuous part, the backlight unit 13 using the three-color LED has three representative peaks as shown in FIG. 9B and has smooth characteristics. ing. The spectral characteristics of the three-color LEDs can be easily adjusted by adjusting the current amounts of the RGB LEDs.
Further, as shown in FIG. 9B, the spectral characteristics of the illumination light emitted from the backlight unit 13 are B (Blue), G (Green), They are distributed in the order of R (Red). Thus, the peak wavelength of the illumination light of the backlight unit 13 is three, which is smaller than the number of four peak wavelengths in the wavelength selection characteristic of the color filter 12.

Furthermore, the peak wavelengths in the spectral characteristics of the illumination light of the backlight unit 13 (see (b) in Table 1) are located in three regions of 400 to 490 nm, 490 to 570 nm, and 600 nm or more. Further, the wavelength selection characteristics (see (b) in Table 1) of the color filter 12 are located in four regions of 400 to 490 nm, 490 to 520 nm, 520 to 570 nm, and 600 nm or more.
Here, the region of 400 to 490 nm and the region of 600 nm or more are wavelengths indicating the colors of B and R, respectively, and are wavelengths on the short wavelength side and the long wavelength side of visible light. And in the said 400-490 nm area | region and a 600 nm or more area | region, the spectral characteristic of the illumination light of the backlight unit 13 and the wavelength selection characteristic of a colored layer correspond.

Further, in the wavelength selection characteristics of the colored layer, the region of 490 to 520 nm and the region of 520 to 570 nm are wavelengths indicating C and G colors. Further, in the spectral characteristics of the illumination light of the backlight unit 13, the region of 490 to 570 nm has a wavelength indicating G color. In this way, the colors C and G of the colored layer are displayed by the light having the wavelength indicating the color G included in the illumination light.
Here, the region (G) of 520 to 570 nm in the wavelength selection characteristics of the colored layer and the region (G) of 490 to 570 nm in the spectral characteristics of the illumination light are set so as to be approximately the same. In addition, the region (C) of 490 to 520 nm in the wavelength selection characteristic of the colored layer is acceptable even if it does not coincide with the peak wavelength of the spectral characteristic of the illumination light.

In the image display system 1 configured as described above, image data input to the input sensor 2A is transmitted to the control circuits 2B and 3B, the signal processing circuits 2D and 3D, the encoding circuit 2E, the decoding circuit 3A, and the driving circuit 3E. Then, it is output to the liquid crystal panel 3F.
Specifically, in the liquid crystal panel 3F, the illumination light of the backlight unit 13 irradiates the four-color colored layer of the color filter 12. Here, the illumination light includes a wavelength according to the spectral characteristics. The colored layer transmits a color having a wavelength corresponding to the wavelength selection characteristic. The liquid crystal layer 11 controls the amount of light transmitted through the color filter 12. As a result, as shown in FIG. 9C, the image is displayed in the number of primary colors of the colored layer in the unit pixel, that is, four colors of BCGR. Further, since the amount of light transmitted through each colored layer is controlled by the liquid crystal layer 11, the light transmitted through each colored layer is synthesized, and a full color image display is performed.
Here, as shown in FIG. 9B, the spectral characteristic of the backlight unit 13 using the three-color LED is smooth, so that the spectral characteristic of the pixel portion is as shown in FIG. 9C. It will have a smooth distribution.

  Next, referring to FIG. 9D, a liquid crystal panel having four color (4CF) colored layers in a unit pixel and a liquid crystal panel having three RGB (3CF) colored layers as described above. The xy chromaticity characteristics comparing the above will be described. The pixel configuration of the three-color coloring layer can realize the color of the triangular region of the xy chromaticity characteristics, but the pixel configuration of the four-color coloring layer can realize the color of the square region of the xy chromaticity characteristics. Is possible. Therefore, the liquid crystal panel 3F of the present embodiment in the pixel configuration of the four-color coloring layer can realize a wide color gamut.

As described above, also in this embodiment, the number of colored layers constituting the unit pixel of the color filter 12 is larger than the number of peak wavelengths of spectral characteristics included in the illumination light. That is, the number of colored layers is four, and the number of peak wavelengths of spectral characteristics is three.
Therefore, by providing four colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths included in the illumination light is smaller than the number of colored layers in the unit pixel, so that the components of the backlight unit 13 can be simplified. Furthermore, with simplification of the components of the backlight unit 13, the color characteristic design of the backlight unit 13 can be easily adjusted.

Moreover, since the peak wavelength of the wavelength selection characteristics of R and B in the colored layer corresponds to the peak wavelength of the spectral characteristics of R and B included in the illumination light, the illumination light having the wavelengths of R and B is colored. Since it does not absorb or attenuate in the layer, the colors of R and B can be displayed in clear color.
In addition, thereby, the wavelength selection characteristics of C and G in the colored layer and the spectral characteristics of G in the illumination light are located in the R and B wavelength regions. G and C are colors with relatively high visibility compared to R and B. Since R and B can be vividly colored as described above, a full color image display can be performed with clear color development as a whole of the four-color colored layer.

In addition, the peak wavelength of illumination light in the spectral characteristics is located in three regions of 400 to 490 nm, 490 to 570 nm, and 600 nm or more, and the colored layers in the unit pixel are 400 to 490 nm, 490 to 520 nm, Since it has wavelength selection characteristics consisting of four regions of 520 to 570 nm and 600 nm or more, the peak wavelength in the spectral characteristics of the illumination light corresponds to the wavelength selection characteristics of the colored layer, and R and B Can be displayed in a clear color.
In addition, in the wavelength range of 490 to 520 nm and 520 to 570 nm in the wavelength selection characteristic of the colored layer and the wavelength range of 490 to 570 nm in the spectral characteristic of the illumination light, the peak wavelength of the illumination light corresponds to the wavelength selection characteristic of the color layer. Therefore, the colors G and C can be displayed with clear color. Therefore, since each of R, G, B, and C can be vividly developed, a full color image can be displayed with a clear color.

In addition, because the four colored layers in the unit pixel are R, G, B, and C in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, the region on the left side or the upper left side of the line segment connecting the coordinates of B and G is the region on the upper right side of the line segment connecting the coordinates of G and R, or R and Since this area is larger than the area on the lower right side of the line segment connecting the coordinates of B, this area has a large room for expressing a color closer to natural light. Therefore, a region having a large room is provided by including a colored layer having a color coordinate located in a region on the left side or upper left side of a line segment connecting the coordinates of B and G, that is, a colored layer of C in the unit pixel. The color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.
Furthermore, the liquid crystal panel 3F having a four-color colored layer containing C in a unit pixel has a display in xy chromaticity characteristics as compared with a liquid crystal panel having another color colored layer such as a Y colored layer in the unit pixel. The possible area can be widened.

Furthermore, in this embodiment, since the backlight unit 13 using three-color LEDs is provided, it is not necessary to use four types of LEDs that emit light of four colors. Therefore, compared with the case where four types of LEDs are employed, the configuration is simple, and the cost of the backlight unit 13 can be suppressed. Further, color adjustment can be facilitated in the color characteristic design of the backlight unit 13.
Therefore, as described above, a very wide color reproduction range can be realized, display colors in a wide wavelength range closer to natural light can be realized, and an increase in cost of the illumination unit can be suppressed.

  Furthermore, the spectral characteristics of the backlight unit 13 using LEDs show a smooth distribution as compared with the spectral characteristics of the illumination unit using fluorescent tubes. As a result, the spectral characteristics of the transmitted light that has passed through the colored layer of the color filter 12 also has a smooth distribution, and an image can be displayed with the smooth spectral characteristics.

Further, the backlight unit 13 using the LED can easily adjust the color characteristic design as compared with the illumination unit using the fluorescent tube.
Specifically, in order to use a fluorescent tube as the backlight unit 13, is it possible to produce fluorescent tubes by applying fluorescent materials corresponding to the emission colors in the tubes, and obtain illumination light having desired spectral characteristics? The fluorescent tube must be used for the backlight unit 13. Therefore, the spectral characteristics of the fluorescent tube cannot be adjusted after the fluorescent tube is manufactured.
On the other hand, in order to use the LED as the backlight unit 13, whether or not illumination light having a desired spectral characteristic can be obtained while adjusting the current amount of the RGB LED corresponding to the spectral characteristic of the illumination light. Since the LED is used for the backlight unit 13, the spectral characteristics can be arbitrarily adjusted.
Therefore, the backlight unit 13 using the LED can easily adjust the color characteristic design as compared with the illumination unit using the fluorescent tube.

  In addition, in this embodiment, although the structure which employ | adopted LED as a solid light source was demonstrated, the said LED is not limited. For example, a solid light source using a self-luminous element such as an organic EL element or a field emission element may be used.

(6th Embodiment of a display part)
Next, with reference to FIG.10 and FIG.11, 6th Embodiment of the display part which concerns on the display apparatus of this invention is described. In the present embodiment, an organic EL panel is adopted as the display unit 3 </ b> F constituting the image display system 1.
FIG. 10 is an enlarged cross-sectional view for explaining a cross-sectional configuration of a unit pixel of the organic EL panel, and FIG. 11 is a color filter wavelength selection characteristic, white organic EL spectral characteristic, pixel partial light characteristic, and organic EL in the organic EL panel. It is a figure which shows the xy chromaticity characteristic of a panel.

As shown in FIG. 10, an organic EL panel (display device) 3F includes a glass substrate 21, a TFT element (light transmission control unit) 22 formed on the glass substrate 21, and a light emitting element (illumination unit, self light emitting means). 23 and the sealing substrate 24.
Specifically, the TFT element 22 is formed on the glass substrate 21, and the TFT element 22 is covered with an insulating film 25. A first partition layer 26 made of an inorganic insulating film and a second partition layer 27 made of an organic insulating film are stacked between the dots on the insulating film 25, and these first and second partition walls are formed on the glass substrate 21. A plurality of dots constituting color pixels are partitioned in a matrix by the layers 26 and 27. These first and second partition layers 26 and 27 are suitable for forming an organic functional layer such as a hole injection / transport layer and a white light emitting layer, which will be described later, by a droplet discharge method such as an inkjet method. A color filter 28 is provided on the insulating film 25. The color filter 28 includes a plurality of colored layers having different colors in each dot of a unit pixel. Furthermore, a pixel electrode 29 is formed above the colored layers having different colors in the color filter 28 . The pixel electrode (anode) 29 is electrically connected to the TFT element 22 through a contact hole that penetrates the insulating film 25 and the color filter 28 . A light emitting element 23 is formed on the pixel electrode 29. A common electrode 32 (cathode) made of a metal film such as aluminum is formed on the light emitting element 23, and the surface of the common electrode 32 is covered with a sealing layer 33 and further sealed with a sealing substrate 24. ing. A material having a gas barrier property is preferable as the material of the sealing layer 33. For example, silicon oxide, silicon nitride, or silicon oxynitride can be suitably used. Glass or the like can be used for the sealing substrate 24.

Next, the configuration of the color filter 28 provided in the organic EL panel of the present embodiment will be described in detail.
The color filter 28 is colored in four colors: red colored layer (colored layer) 28 R, green colored layer (colored layer) 28 G, blue colored layer (colored layer) 28 B, cyan colored layer (colored layer) 28 C Each dot has a layer, and a unit pixel is constituted by four dots of RGBC.
As a result, color display color reproduction is performed by additive color mixing of four primary colors of RGBC light. Therefore, the organic EL panel 3F has a wider color reproduction range than that which performs color display with three colors of RGB.
In addition, each of the RGBC colored layers is provided corresponding to each of the light emitting elements 23, and the light emitted from the light emitting elements 23 emits the light emitted from the RGBC colored layers. Yes. By irradiating each RGBC colored layer with illumination light, light of a predetermined wavelength region, in other words, a predetermined color included in the illumination light is transmitted to the viewer side.

11 (a) shows, a color filter 28, i.e., it shows the red color layer 28 R, a green color layer 28 G, a blue colored layer 28 B, and the wavelength selection characteristics of the cyan coloring layer 28 C. As shown in FIG. 11A, the wavelength selection characteristics of the four-color colored layers of B (Blue), C (Cyan), G (Green), and R (Red) are from the short wavelength side to the long wavelength side of visible light. It is distributed in order. Accordingly, the color filter 28 selectively transmits the illumination light of the light emitting element 23 at the four peak wavelengths.

Next, the configuration of the light emitting element 23 provided in the organic EL panel of the present embodiment will be described in detail.
The light emitting element 23 is configured by sequentially laminating a hole injection / transport layer 30 and a white light emitting layer 31 made of an organic material on each pixel electrode 29.
In this embodiment, the white light emitting layer 31 emits light in each of the pixel electrodes 29, so that the plurality of white light emitting layers 31 irradiate each RGBC colored layer corresponding to the white light emitting layer 31 with emitted light. It is supposed to be.

  In the present embodiment, the white light emitting layers 31 of all dots are formed of the same organic material that can emit white light. As a material for forming the hole injection / transport layer 30, polymer materials such as polythiophene, polystyrene sulfonic acid, polypyrrole, polyaniline, and derivatives thereof can be suitably used. As a forming material (light emitting material) of the white light emitting layer 31, a polymer light emitting material or a low molecular weight organic light emitting dye, that is, a light emitting material such as various fluorescent materials or phosphorescent materials can be used. Among the conjugated polymers that serve as a light-emitting substance, those containing an arylene vinylene or polyfluorene structure are particularly preferable. When the white light emitting layer 31 is formed by an ink jet method (droplet discharge method), it is desirable to use a polymer material as the light emitting material. For example, polydioctylfluorene (PFO) and MEH-PPV are mixed at a ratio of 9: 1. What was done can be used suitably. In the present embodiment, the light emitting element 23 has the above two-layer structure, but an electron transport layer, an electron injection layer, or the like may be provided on the light emitting layer as necessary.

FIG. 11B shows the spectral characteristics of the white light emitting layer 31. As shown in FIG. 11B, the spectral characteristics of the emitted light of the white light emitting layer 31 are B (Blue), G (Green), R (Red) from the short wavelength side to the long wavelength side of visible light. It is distributed in the order. Thus, the peak wavelength of the emitted light of the white light emitting layer 31 is three (predetermined peak wavelength), which is smaller than the number of four peak wavelengths in the wavelength selection characteristic of the color filter 28 . Further, the spectral characteristics of B and R coincide with the wavelength selection characteristics of B and R shown in FIG.
The spectral characteristics of the white light emitting layer 31 are the same for each dot in the unit pixel. In addition, the light that is the sum of the respective emitted lights corresponds to the illumination light of the present invention.

Next, the configuration of the TFT element 22 provided in the organic EL panel of this embodiment will be described in detail.
The TFT element 22 sequentially changes the amount of current supplied to the light emitting element 23 between the pixel electrode 29 and the common electrode 32, and adjusts the amount of light emission (luminance of emitted light) in accordance with the change in the current amount. The amount of light transmitted through the color filter 28 is controlled. The switching operation of the TFT element 22 is controlled by the drive circuit (light transmission control unit) 3E in the image display system 1 described above.

In the organic EL panel 3F configured as described above, the image data input to the input sensor 2A of the image display system 1 includes control circuits 2B and 3B, signal processing circuits 2D and 3D, an encoding circuit 2E, and a decoding circuit. The light is output to the organic EL panel 3F through 3A and the drive circuit 3E.
Specifically, in the organic EL panel 3 </ b> F, the emitted light (illumination light) of the white light emitting layer 31 irradiates the four-color colored layer of the color filter 28 . Here, the illumination light includes a wavelength according to the spectral characteristics.
Then, the amount of current supplied to the light emitting element 23 between the pixel electrode 29 and the common electrode 32 is controlled by driving the TFT 22 and the driving circuit 3E, and electric energy is substituted for light energy in the light emitting element 23, and the light emission amount is controlled. Thus, the amount of light transmitted through the colored layer is controlled. Further, each colored layer in the unit pixel selects the wavelength of the emitted light of the white light emitting layer 31 according to the wavelength selection characteristics. Then, the wavelength-selected lights are combined to become transmitted light.

  As a result, as shown in FIG. 11C, an image is displayed in the number of primary colors of the colored layer in the unit pixel, that is, four colors of BCGR. Since the amount of light transmitted through each colored layer is controlled by the TFT 22 and the drive circuit 3E, the light transmitted through each colored layer is combined and a full color image display is performed.

  Further, as shown in FIG. 11C, the spectral characteristic of the colored layer of C has a distribution including the spectral characteristics of both B and G of the emitted light of the white light emitting layer 31. Therefore, in the prior art document, a single peak value peculiar to C appears in the spectral characteristics, but in this embodiment, a single peak value peculiar to C does not appear.

  Next, referring to FIG. 11D, an organic EL panel having four color (4CF) colored layers in the unit pixel and a liquid crystal panel having three colored RGB (3CF) colored layers are provided. The compared xy chromaticity characteristics will be described. The pixel configuration of the three-color coloring layer can realize the color of the triangular region of the xy chromaticity characteristics, but the pixel configuration of the four-color coloring layer can realize the color of the square region of the xy chromaticity characteristics. Is possible. Therefore, the organic EL panel 3F of the present embodiment in the pixel configuration of the four-color colored layer can realize a wide color gamut.

As described above, in the present embodiment, as in the first embodiment, the number of colored layers constituting the unit pixel of the color filter 28 is larger than the number of peak wavelengths of spectral characteristics included in the illumination light. The number of layers is four, and the number of peak wavelengths of spectral characteristics is three.
Therefore, by providing four colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths contained in the emitted light is smaller than the number of colored layers in the unit pixel, whereby simplification of the constituent material of the white light emitting layer 31 can be achieved. Further, with the simplification of the constituent material of the white light emitting layer 31, the color characteristic design of the white light emitting layer 31 can be easily adjusted.

Moreover, since the peak wavelength of the wavelength selection characteristics of R and B in the colored layer corresponds to the peak wavelength of the spectral characteristics of R and B included in the illumination light, the illumination light having the wavelengths of R and B is colored. Since it does not absorb or attenuate in the layer, the colors of R and B can be displayed in clear color.
Further, the G and C wavelength selection characteristics in the colored layer and the G spectral characteristics in the illumination light are located in the R and B wavelength regions. G and C are colors with relatively high visibility compared to R and B. Since R and B can be vividly colored as described above, a full color image display can be performed with clear color development as a whole of the four-color colored layer.

In addition, since the four colored layers in the unit pixel are R, G, B, and C in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, the region on the left side or the upper left side of the line segment connecting the coordinates of B and G is the region on the upper right side of the line segment connecting the coordinates of G and R, or R and Since this area is larger than the area on the lower right side of the line segment connecting the coordinates of B, this area has a large room for expressing a color closer to natural light. Therefore, a region having a large room is provided by including a colored layer having a color coordinate located in a region on the left side or upper left side of a line segment connecting the coordinates of B and G, that is, a colored layer of C in the unit pixel. The color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.
Furthermore, the organic EL panel 3F having a four-color colored layer containing C in the unit pixel has an xy chromaticity characteristic as compared with a liquid crystal panel having another color-colored layer such as a Y colored layer in the unit pixel. The displayable area can be widened.

(Seventh Embodiment of Display Unit)
Next, a seventh embodiment of the display unit according to the display apparatus of the present invention will be described with reference to FIGS. In the present embodiment, an organic EL panel is adopted as the display unit 3 </ b> F constituting the image display system 1.
12 is an enlarged cross-sectional view for explaining a cross-sectional configuration of a unit pixel of the organic EL panel, and FIG. 13 is a color filter wavelength selection characteristic, backlight spectral characteristic, pixel partial light characteristic, and organic EL panel in the organic EL panel. It is a figure which shows xy chromaticity characteristic.

The organic EL panel in the sixth embodiment described above has a configuration in which each of the light emitting elements 23 in the unit pixel includes the white light emitting layer 31, but the organic EL panel in the present embodiment has the white light emission. Instead of the layer 31, a four-color light emitting element that emits light of each color of RGBC is provided.
In the following description, a configuration different from that of the sixth embodiment will be described, and the same configuration is denoted by the same reference numeral and description thereof is omitted.

  First, the color filter 12 included in the organic EL panel of the present embodiment has the same wavelength selection characteristics as those of the sixth embodiment. That is, each of the four colored layers of the red colored layer 12R, the green colored layer 12G, the blue colored layer 12B, and the cyan colored layer 12C is provided for each dot, and the unit pixel is configured by four RGBC dots. . As shown in FIG. 13A, the wavelength selection characteristics of the four-color colored layers of B (Blue), C (Cyan), G (Green), and R (Red) are long from the short wavelength side of visible light. They are distributed in order toward the wavelength side. Therefore, the color filter 12 transmits the illumination light of the backlight unit 13 at four peak wavelengths in a wavelength selective manner.

Next, the configuration of the light emitting element 23 provided in the organic EL panel of the present embodiment will be described in detail.
In the case of the organic EL panel 3F of the present embodiment, as shown in FIG. 12, a light emitting layer that emits light of different colors is formed on each dot. For example, light emitting layers of four colors, a red light emitting layer 31R, a green light emitting layer 31G, a blue light emitting layer 31B, and a green light emitting layer 31G, are formed from the left dot to the right dot in FIG. The second and fourth green light emitting layers 31G may be the same or different in material and film thickness. For example, as the material of each light emitting layer, cyanopyriphenylene vinylene can be used for the red light emitting layer 31R, polyphenylene vinylene or the like can be used for the green light emitting layer 31G and the blue light emitting layer 31B.
Therefore, in the organic EL panel 3F of the present embodiment, of the plurality of light emitting layers, the two green light emitting layers 31G generate light in the wavelength region having one peak wavelength in the spectral characteristics, and other red light emission. Each of the layer 31 </ b> R and the blue light emitting layer 31 </ b> B generates emitted light in a wavelength region having a peak wavelength different from the one peak wavelength.

From the left side of FIG. 12, the red colored layer 12R of the color filter 12 is formed on the red light emitting layer 31R of the light emitting unit 23, the green colored layer 12G is formed on the green light emitting layer 31G, and the blue colored layer 12B is formed on the blue light emitting layer 31B. The cyan colored layer 12C corresponds to the light emitting layer 31G. Accordingly, the two green light emitting layers 31G irradiate the blue colored layer 12B and the cyan colored layer 12C corresponding to the green light emitting layer 31G. The red colored layer 12R irradiates the red colored layer 12R, and the blue light emitting layer 31B irradiates the blue colored layer 12B.
As a result, color reproduction of color display is performed by additive color mixing of four primary colors consisting of red (R), green (G), blue (B), and cyan (C). Accordingly, the organic EL panel 3F according to the present embodiment has a wider color reproduction range than that for performing color display with three colors of R, G, and B.

  Further, each of the emitted light in the four color light emitting layers of the red light emitting layer 31R, the green light emitting layer 31G, the blue light emitting layer 31B, and the green light emitting layer 31G constitutes a part of the illumination light. In other words, illumination light is generated by bundling the light emitted from the light emitting layers of four colors. Accordingly, as shown in FIG. 13B, the bundled illumination light is generated by emitting light from each of the red light emitting layer 31R, the green light emitting layer 31G, and the blue light emitting layer 31B (Blue, Green, Red). This spectral characteristic has continuous spectral characteristics having three peak wavelengths from the short wavelength side to the long wavelength side of visible light.

  In the organic EL panel 3F configured as described above, emitted light of each color of the red light emitting layer 31R, the green light emitting layer 31G, and the blue light emitting layer 31B is converted into the red colored layer 12R, the green colored layer 12G, the blue colored layer 12B, After passing through the cyan colored layer 12C, transmitted light obtained by combining light in a plurality of wavelength regions is obtained.

  As a result, as shown in FIG. 13C, an image is displayed in the number of primary colors of the colored layer in the unit pixel, that is, four colors of BCGR. Since the amount of light transmitted through each colored layer is controlled by the TFT 22 and the drive circuit 3E, the light transmitted through each colored layer is combined and a full color image display is performed.

  Further, as shown in FIG. 13C, the spectral characteristic of the colored layer of C has a distribution including both the spectral characteristics of B and G of the emitted light of the green light emitting layer 31G. Therefore, in the prior art document, a single peak value peculiar to C appears in the spectral characteristics, but in this embodiment, a single peak value peculiar to C does not appear.

  Next, referring to FIG. 13D, an organic EL panel having four colored (4CF) colored layers in the unit pixel and a liquid crystal panel having three colored RGB (3CF) colored layers are provided. The compared xy chromaticity characteristics will be described. The pixel configuration of the three-color coloring layer can realize the color of the triangular region of the xy chromaticity characteristics, but the pixel configuration of the four-color coloring layer can realize the color of the square region of the xy chromaticity characteristics. Is possible. Therefore, the organic EL panel 3F of the present embodiment in the pixel configuration of the four-color colored layer can realize a wide color gamut.

As described above, in the present embodiment, as in the sixth embodiment, the number of colored layers constituting the unit pixel of the color filter 12 is larger than the number of peak wavelengths of spectral characteristics included in the illumination light. The number of layers is four, and the number of peak wavelengths of spectral characteristics is three.
Therefore, by providing four colored layers in a unit pixel, a very wide color reproduction range can be realized, and an image can be displayed with display colors in a wide wavelength range closer to natural light. Furthermore, not only the wide color gamut can be realized, but also the number of peak wavelengths contained in the emitted light is smaller than the number of colored layers in the unit pixel, whereby simplification of the constituent material of the white light emitting layer 31 can be achieved. Further, with the simplification of the constituent material of the white light emitting layer 31, the color characteristic design of the white light emitting layer 31 can be easily adjusted.

Moreover, since the peak wavelength of the wavelength selection characteristics of R and B in the colored layer corresponds to the peak wavelength of the spectral characteristics of R and B included in the illumination light, the illumination light having the wavelengths of R and B is colored. Since it does not absorb or attenuate in the layer, the colors of R and B can be displayed in clear color.
Further, the G and C wavelength selection characteristics in the colored layer and the G spectral characteristics in the illumination light are located in the R and B wavelength regions. G and C are colors with relatively high visibility compared to R and B. Since R and B can be vividly colored as described above, a full color image display can be performed with clear color development as a whole of the four-color colored layer.

In addition, since the four colored layers in the unit pixel are R, G, B, and C in this way, a very wide color reproduction range is realized, and display colors in a wide wavelength range closer to natural light are realized. it can.
More specifically, in the xy chromaticity characteristics, the region on the left side or the upper left side of the line segment connecting the coordinates of B and G is the region on the upper right side of the line segment connecting the coordinates of G and R, or R and Since this area is larger than the area on the lower right side of the line segment connecting the coordinates of B, this area has a large room for expressing a color closer to natural light. Therefore, a region having a large room is provided by including a colored layer having a color coordinate located in a region on the left side or upper left side of a line segment connecting the coordinates of B and G, that is, a colored layer of C in the unit pixel. The color reproduction range can be increased. Therefore, it is possible to realize a very wide color reproduction range and display colors in a wide wavelength range closer to natural light.
Furthermore, the organic EL panel 3F having a four-color colored layer containing C in the unit pixel has an xy chromaticity characteristic as compared with a liquid crystal panel having another color-colored layer such as a Y colored layer in the unit pixel. The displayable area can be widened.

(Modification)
Next, modified examples of the sixth and seventh embodiments will be described.
Although 6th and 7th embodiment has shown the structure which employ | adopted the organic EL panel as the display part 3F in the image display system 1, it is not limited to the said embodiment, The modification shown below is an organic EL panel It is possible to apply to.

  10 and 12 show examples of the bottom emission structure in which light is extracted from the drive element substrate side, but the present invention can also be applied to a top emission structure in which light is extracted from the opposite side of the drive element substrate. Even in this case, the number of spectral characteristics of the light-emitting element can be three, and since the number of peaks is small, versatility is maintained and the light-emitting material can be simplified and realized at low cost. .

  10 and 12 show only the basic components of the organic EL panel, but the present invention can also be applied to a configuration in which an optical interference structure called a microcavity is added to this basic configuration. The microcavity has the effect of narrowing the emission peak width by light interference and improving the color reproducibility. Even in this case, the number of spectral characteristics of the light-emitting element can be three, and since the number of peaks is small, versatility is maintained, and the light-emitting material can be simplified, which can be realized at low cost. Become.

  Moreover, although the case where a low molecular weight material and a high molecular weight material are used for the light emitting element 23 of the organic EL panel can be considered, the present modification can be applied to any of these cases. . For this reason, the method for forming the light emitting element 23 is not limited, and for example, either a low molecular deposition method or a high molecular inkjet method or spin coating method can be used.

  FIG. 10 shows an example of colorization by transmitting the light emitted from the white light emitting layer 31 to the color filter 12, and FIG. 12 shows the light emitted from the light emitting layers 31R, 31G, and 31B (material coating) of each color. Although this is an example of colorization by the method of transmitting through the color filter 12, this modification can also be applied to colorization by the color conversion method. The color conversion method is a method in which an RGB color conversion layer is combined with a light emitting layer that emits white light. In this case, the number of peaks of the light emission characteristics of the portion including the color conversion layer is set to 3, and a color filter layer is added in addition. As a result, the number of spectral characteristics of the light emitting element can be three, and since the number of peaks is small, versatility is maintained, and the light emitting material can be simplified and can be realized at low cost.

(Electronics)
FIG. 7 shows an embodiment of the electronic apparatus of the present invention.
The electronic apparatus of this example is configured to include the above-described image display system.
FIG. 7 is a perspective view showing an example of a mobile phone. In FIG. 7A, reference numeral 1000 indicates a mobile phone body, reference numeral 1001 indicates a display unit using the liquid crystal panel 3F, and the side indicated by reference numeral 1002 (the back side of the display unit) is the input sensor. A CCD camera using 2A is provided.
Since the electronic device shown in FIG. 7 includes the liquid crystal panel 3F of the above-described embodiment in the display unit, not only can the image be displayed with a display color in a wide wavelength range closer to natural light, but also a low-cost electronic device. Equipment can be realized.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

1 is a block diagram showing a configuration of an image display system according to a first embodiment of the present invention. The top view which shows each component of the liquid crystal panel in the image display system of FIG. The perspective view which shows the cross-sectional structure of the liquid crystal panel in the image display system of FIG. FIG. 2 is a plan layout view of color filters of a liquid crystal panel in the image display system of FIG. 1. The figure which shows the various optical characteristics of the image display system in 1st Embodiment of this invention. The figure which shows the various optical characteristics of the image display system in 2nd Embodiment of this invention. The figure which shows the various optical characteristics of the image display system in 3rd Embodiment of this invention. The figure which shows the various optical characteristics of the image display system in 4th Embodiment of this invention. The figure which shows the various optical characteristics of the image display system in 5th Embodiment of this invention. The top view which shows each component of the organic electroluminescent panel of the image display system of FIG. The figure which shows the various optical characteristics of the image display system in 6th Embodiment of this invention. The top view which shows each component of the organic electroluminescent panel of the image display system of FIG. The figure which shows the various optical characteristics of the image display system in 7th Embodiment of this invention. FIG. 16 illustrates an electronic device including the display device of the invention.

Explanation of symbols

3F display unit (display device), 3F liquid crystal panel (display device), 3F organic EL panel (display device), 11 liquid crystal layer (light transmission control unit), 12 color filter (color filter unit), 12R red colored layer ( Colored layer), 12G Green colored layer (colored layer), 12B Blue colored layer (colored layer), 12C Cyan colored layer (colored layer), 13 Backlight unit (illumination unit), 23 Light emitting element (illumination unit), 31G Green light emitting layer (light emitting element, second light emitting element), 31R Red light emitting layer (light emitting element, other light emitting elements), 31B Blue light emitting layer (light emitting element, other light emitting elements), 22 TFT element (light transmission control unit) ), 3E drive circuit (light transmission control unit), 1000 mobile phone body (electronic device).

Claims (6)

  1. A plurality of unit pixels provided with a plurality of light emitting elements that emit illumination light including a plurality of peak wavelengths,
    A colored layer and a thin film transistor are provided corresponding to each of the plurality of light emitting elements,
    In the wavelength selection characteristic, among the plurality of colored layers, the first colored layer corresponds to a red wavelength region, the second colored layer corresponds to a blue wavelength region, and the third colored layer corresponds to a green wavelength region. Corresponding to
    The fourth colored layer corresponds to the cyan wavelength region,
    The illumination light is applied to the colored layer,
    The amount of transmitted light of the colored layer is controlled by controlling the light emission luminance of the light emitting element corresponding to the colored layer by the thin film transistor provided corresponding to the light emitting element,
    The number of colored layers in the unit pixel is larger than the number of the plurality of peak wavelengths included in the illumination light, and image display is performed with the primary colors of the number of the colored layers,
    The peak wavelength of the wavelength selection characteristic of the first colored layer corresponds to the first peak wavelength among the plurality of peak wavelengths included in the illumination light on the long wavelength side in the visible light wavelength region,
    The peak wavelength of the wavelength selection characteristic of the second colored layer corresponds to the second peak wavelength among the plurality of peak wavelengths included in the illumination light on the short wavelength side in the visible light wavelength region,
    The peak wavelength of the wavelength selection characteristic of the fourth colored layer does not correspond to the second peak wavelength;
    A display device.
  2. The number of colored layers in the unit pixel is four, and the number of the plurality of peak wavelengths included in the illumination light is three.
    Displaying images with four primary colors,
    The display device according to claim 1.
  3. The peak wavelength of the illumination light is located in three regions of 400 to 490 nm, 490 to 570 nm, and 600 nm or more,
    The colored layer in the unit pixel has wavelength selection characteristics including four regions of 400 to 490 nm, 490 to 520 nm, 520 to 570 nm, and 600 nm or more,
    The display device according to claim 2.
  4. The number of colored layers in the unit pixel is 5, and the number of the plurality of peak wavelengths included in the illumination light is 3,
    Displaying images with five primary colors,
    The display device according to claim 1.
  5. The peak wavelength of the illumination light is located in three regions of 400 to 490 nm, 490 to 600 nm, and 600 nm or more,
    The colored layer in the unit pixel has wavelength selection characteristics including five regions of 400 to 490 nm, 490 to 520 nm, 520 to 570 nm, 570 to 600 nm, and 600 nm or more,
    The display device according to claim 4 .
  6. Comprising the display device according to any one of claims 1 to 5 ,
    Electronic equipment characterized by
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WO2006109577A1 (en) * 2005-04-05 2006-10-19 Sharp Kabushiki Kaisha Color filter substrate and display
US7952662B2 (en) 2005-04-05 2011-05-31 Sharp Kabushiki Kaisha Transflective display device
JP2007212712A (en) * 2006-02-09 2007-08-23 Epson Imaging Devices Corp Electrooptical device and electronic apparatus
JP5403860B2 (en) 2006-10-10 2014-01-29 株式会社ジャパンディスプレイ Color liquid crystal display device
JP2008225179A (en) * 2007-03-14 2008-09-25 Sony Corp Display device, driving method of the display device, and electronic apparatus
JP5391681B2 (en) * 2008-12-18 2014-01-15 凸版印刷株式会社 Liquid crystal image display device

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JP2001306023A (en) * 2000-04-18 2001-11-02 Seiko Epson Corp Image display device
JP2003098337A (en) * 2001-06-04 2003-04-03 Toray Ind Inc Color filter and liquid crystal display device
JP2003249174A (en) * 2002-02-26 2003-09-05 Matsushita Electric Ind Co Ltd Plasma display device

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