JP2015194636A - Lighting device, display device, and television reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve color reproducibility without spoiling use efficiency of light.SOLUTION: A liquid-crystal display device 10 includes: a backlight device 12 including an LED 17 having a blue LED element 40, a green phosphor which has a light emission spectrum of less than 60 nm in half-value width having a peak at a peak wavelength of 520 nm to 540 nm, and a red phosphor which has a light emission spectrum of less than 10 nm in half-value width having a main peak at a peak wavelength of 629 nm to 635 nm, and further including a first sub-peak at a peak wavelength of 607 nm to 614 nm and a second sub-peak at a peak wavelength of 645 nm to 648 nm; and a liquid-crystal panel 11 which has a color filter 29 comprising a plurality of coloration parts 29R, 29G, and 29B, and performs displaying utilizing light from the backlight device 12.

Description

  The present invention relates to a display device and a television receiver.

A liquid crystal panel, which is a main component of a liquid crystal display device, has a structure in which liquid crystal is roughly sealed between a pair of glass substrates, and an array substrate on which one of the two glass substrates is provided with an active element TFT or the like. In contrast, the other side is a CF substrate provided with a color filter or the like. On the inner surface of the CF substrate facing the array substrate, a color filter is formed in which a number of colored portions corresponding to each color of red, green, and blue are arranged in parallel corresponding to each pixel of the array substrate. The light emitted from the backlight and transmitted through the liquid crystal is selectively transmitted through only the predetermined wavelengths corresponding to the red, green, and blue colored portions forming the color filter, so that an image is displayed on the liquid crystal panel. It has become so. As an example of such a liquid crystal display device, one described in Patent Document 1 below is known.
In this patent document 1, in a liquid crystal display device using a two-wavelength white LED backlight composed of a blue light emitting LED and a yellow light emitting phosphor as a light source, a wavelength between 580 nm and 600 nm is provided on one surface of a translucent substrate. A color correction film in which a binder resin layer or adhesive layer containing a visible light absorbing dye having an absorption maximum in the region is laminated to effectively separate green and red and improve color reproducibility is described. ing.

JP 2012-27298 A

  The above-described color correction film described in Patent Document 1 also absorbs light having a wavelength other than the wavelength having the absorption maximum value (for example, blue light), and absorbs light over the entire visible light region. For this reason, the utilization efficiency of light deteriorates, and there is a possibility that the brightness is reduced or the power consumption is increased. However, for example, if the color reproducibility is improved by increasing the film thickness of the color filter, the light transmittance of the color filter is reduced, which also results in the deterioration of the light utilization efficiency. .

  The present invention has been completed based on the above situation, and an object thereof is to improve color reproducibility without impairing light utilization efficiency.

  The display device of the present invention is a blue light emitting element that emits blue light, and a green phosphor that emits green light when excited by the blue light from the blue light emitting element, and has a peak wavelength in the range of 520 nm to 540 nm. And a red phosphor that emits red light when excited by blue light from the blue light emitting element, and has a peak wavelength of 629 nm. A second peak including a main peak in a range of ˜635 nm and a half width of less than 10 nm, and further including a first sub-peak in which a peak wavelength is in a range of 607 nm to 614 nm and a peak wavelength in a range of 645 nm to 648 nm. An illumination device including a light source having a red phosphor having an emission spectrum including a sub-peak, and at least blue, green, and red It has a color filter comprising a plurality of colored portions that, and a display panel configured to provide display using light from the lighting device.

  In this way, when the light emitted from the light source provided in the lighting device is supplied to the display panel, the light is provided in the display panel and is a color composed of a plurality of colored portions exhibiting at least blue, green, and red. By passing through the filter and being emitted from the display panel, an image is displayed on the display panel. Here, the light source provided in the illumination device includes blue light emitted from a blue light emitting element, green light emitted from a green phosphor excited by blue light, and red emitted from a red phosphor excited by blue light. The light emits light that is generally white as a whole.

  The green phosphor included in the light source has an emission spectrum that includes a peak having a peak wavelength in the range of 520 nm to 540 nm and a half width of less than 60 nm, and is thus emitted from the green phosphor. The color purity of green light is sufficiently high. In addition, the red phosphor included in the light source includes a main peak having a peak wavelength in the range of 629 nm to 635 nm, a half width of less than 10 nm, and a peak wavelength in the range of 607 nm to 614 nm. Since it has an emission spectrum including the first sub-peak and the second sub-peak having a peak wavelength in the range of 645 nm to 648 nm, the color purity of the red light emitted from the red phosphor is sufficiently high. In particular, when the half-width at the main peak of the emission spectrum of the red phosphor is set to less than 10 nm, a higher color purity is obtained as compared with a case where the half-width is larger than that. Moreover, since the peak wavelength at the main peak of the emission spectrum of the red phosphor is set to be equal to or greater than the lower limit (629 nm) of the numerical range described above, the hue is closer to yellow than when the wavelength is shorter than that. Misalignment can be avoided. Furthermore, since the peak wavelength at the main peak of the emission spectrum of the red phosphor is set to be not more than the upper limit (635 nm) of the numerical range described above, the peak of visibility is higher than when the wavelength is longer than that. Therefore, the brightness of red light is sufficiently obtained. Further, since the half width at the peak of the emission spectrum of the green phosphor is less than 60 nm, a higher color purity is obtained as compared with a case where the half width is larger than that. In addition, when the peak wavelength of the emission spectrum of the green phosphor is set to be equal to or greater than the lower limit (520 nm) of the numerical range described above, the hue may be shifted closer to blue than when the wavelength is shorter than that. In addition to being avoided, the brightness of the green light can be sufficiently obtained by being closer to the visibility peak of 555 nm. In addition, when the peak wavelength of the emission spectrum of the green phosphor is set to the upper limit (540 nm) of the above numerical range, the hue may be shifted to yellow as compared with the case where the wavelength is longer than that. can avoid. As a result, the green and red color gamuts are expanded with respect to the chromaticity regions relating to the emitted light of the display panel obtained by transmitting the light from the light source to the colored portions of each color constituting the color filter. The color reproducibility related to the image displayed on the panel is improved. Therefore, color reproduction can be achieved without sacrificing light use efficiency compared to conventional color correction films or increased color filter thickness to improve color reproducibility. It is possible to improve the performance. Thus, the chromaticity region in the light emitted from the display panel is at least equal to or greater than the DCI chromaticity region according to the DCI (Digital Cinema Initiative) standard in the CIE 1976 chromaticity diagram (100% or 100% or more in area ratio). It is possible to obtain a wide area, and thus high color reproducibility can be obtained.

The following configuration is preferable as an embodiment of the present invention.
(1) The green phosphor contains an oxynitride phosphor. In this way, for example, compared with the case where a phosphor made of sulfide or oxide is used, the light emission efficiency is excellent and the durability is excellent.

(2) The oxynitride phosphor is made of a sialon phosphor. In this way, green light with high color purity can be emitted by sufficiently narrowing the half width of the peak included in the emission spectrum.

(3) The sialon-based phosphor is β-SiAlON using europium as an activator. If it does in this way, luminous efficiency and durability will become more excellent. In addition, green light with high color purity can be emitted by narrowing the half width of the peak included in the emission spectrum.

(4) The red phosphor contains a double fluoride phosphor. In this way, red light with high color purity can be emitted by sufficiently narrowing the half width of the main peak included in the emission spectrum. Further, since it is difficult to absorb the green light emitted from the green phosphor, the utilization efficiency of the green light is kept high.

(5) The double fluoride phosphor is potassium silicofluoride using manganese as an activator. In this way, since an expensive rare earth element is not used as a material, the manufacturing cost relating to the red phosphor and the light source becomes low.

(6) The colored portion exhibiting green in the color filter has a transmission spectrum including a peak having a peak wavelength in the range of 510 nm to 550 nm and a half width of less than 110 nm. In this way, since the peak of the emission spectrum of the green phosphor is included over the entire area in the transmission spectrum related to the colored portion exhibiting green, green light with high color purity emitted from the light source exhibits green. The colored portion is efficiently transmitted. As a result, the utilization efficiency related to the green light from the light source can be kept higher, and the green color gamut in the chromaticity region related to the emitted light of the display panel becomes wider, and the color reproducibility is more excellent.

(7) The colored portion exhibiting red in the color filter has a transmission spectrum in which the peak rising position is 560 nm or more. In this case, the main spectrum, the first subpeak, and the second subpeak of the emission spectrum of the red phosphor are included in the entire transmission spectrum of the colored portion exhibiting red, and thus the light is emitted from the light source. Red light with high color purity efficiently passes through the colored portion exhibiting red. As a result, the utilization efficiency related to the red light from the light source can be kept higher, and the red color gamut in the chromaticity region related to the emitted light of the display panel becomes wider, and the color reproducibility is more excellent.

(8) The blue light emitting device has an emission spectrum including a peak having a peak wavelength in a range of 430 nm to 460 nm. In this way, the green phosphor and the red phosphor can be efficiently excited by the blue light emitted from the blue light emitting element to emit the green light and the red light.

(9) The colored portion exhibiting blue in the color filter has a transmission spectrum including a peak having a peak wavelength in a range of 440 nm to 480 nm and a half width of less than 110 nm. In this way, the peak of the emission spectrum of the blue light emitting element is included in the entire transmission spectrum of the colored portion exhibiting blue, so that the blue light with high color purity emitted from the light source exhibits blue. The colored portion is efficiently transmitted. As a result, the utilization efficiency related to the blue light from the light source can be kept higher, and the blue color gamut in the chromaticity region related to the emitted light of the display panel becomes wider, and the color reproducibility is more excellent.

(10) The colored portion constituting the color filter includes a yellow color. In this way, each of the green and yellow color gamuts is further expanded with respect to the chromaticity region relating to the emitted light of the display panel obtained by transmitting the light from the light source to the colored portions of each color constituting the color filter. Therefore, the color reproducibility concerning the image displayed on the display panel is further improved. In addition to the CIE 1976 chromaticity diagram, the chromaticity region in the light emitted from the display panel is equal to or more than the DCI chromaticity region according to the DCI standard in the CIE 1931 chromaticity diagram (100% or 100% or more in area ratio). ), It is possible to obtain higher color reproducibility.

(11) The colored portion exhibiting yellow in the color filter has a transmission spectrum in which the peak rising position is in the range of 460 nm to 560 nm. In this way, the transmission spectrum of the colored portion exhibiting yellow includes the peak of the emission spectrum of the green phosphor over the entire area, and the main peak, the first subpeak, and the second subpeak of the emission spectrum of the red phosphor. Since they are included over the entire area, green light and red light with high color purity emitted from the light source efficiently pass through the colored portion exhibiting yellow. As a result, the utilization efficiency related to the green light and red light from the light source can be kept higher, and the yellow color gamut in the chromaticity region related to the emitted light of the display panel becomes wider, and the color reproducibility is more excellent.

(12) The light source has a light emitting surface that emits light, and the light emitting surface is arranged to face the plate surface of the display panel. If it does in this way, the light emitted from the light emission surface of the light source will be irradiated toward the plate | board surface of the display panel arrange | positioned so that it may become a shape facing a light emission surface. According to such a direct type illumination device, light from the light source is supplied to the display panel without passing through a member such as a light guide plate used in an edge light type, so that the light utilization efficiency is further improved.

(13) The illuminating device is disposed in a shape facing the light source, and has a light incident surface on which light from the light source is incident on an end surface, and is disposed in a shape facing the plate surface of the display panel. And a light guide plate having a light emitting surface for emitting light toward the display panel on the plate surface. In this way, the light emitted from the light source is incident on the light incident surface provided on the end surface of the light guide plate, then propagates and diffuses in the light guide plate, and is then provided on the plate surface of the light guide plate. The light is emitted from the light exit surface as planar light and irradiated onto the display panel. According to such an edge light type illumination device, when using a plurality of light sources, it is possible to sufficiently increase the luminance uniformity related to the emitted light while reducing the number of installed light sources when using a plurality of light sources. it can.

  Next, in order to solve the above-described problem, a television receiver of the present invention is a television receiver including the above-described display device and a receiving unit capable of receiving a television signal. According to such a television receiver, a television image having high luminance and excellent color reproducibility can be displayed.

  According to the present invention, color reproducibility can be improved without impairing light utilization efficiency.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. The exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal panel Enlarged plan view showing the planar configuration of the array substrate Enlarged plan view showing the planar configuration of the CF substrate The top view which shows arrangement | positioning structure of the chassis in the backlight apparatus with which a liquid crystal display device is equipped, a light-guide plate, and an LED board. Vii-vii sectional view of FIG. Cross section of LED and LED board The graph which shows the emission spectrum in LED which concerns on Example 1 of the comparative experiment 1, and the transmission spectrum of each coloring part of the color filter which concerns on Example 1. The graph which shows the transmission spectrum of each color of the emitted light of the liquid crystal panel which concerns on Example 1 of the comparative experiment 1, and the emission spectrum in LED which concerns on Example 1. FIG. The graph which shows the emission spectrum in LED which concerns on the comparative example 1 of the comparative experiment 1, and the transmission spectrum of each coloring part of the color filter which concerns on the comparative example 1. The graph which shows the transmission spectrum of each color of the emitted light of the liquid crystal panel which concerns on the comparative example 1 of the comparative experiment 1, and the emission spectrum in LED which concerns on the comparative example 1. The graph which shows the emission spectrum in LED which concerns on the comparative example 2 of the comparative experiment 1, and the transmission spectrum of each coloring part of the color filter which concerns on the comparative example 2. The graph which shows the transmission spectrum of each color of the emitted light of the liquid crystal panel which concerns on the comparative example 2 of the comparative experiment 1, and the emission spectrum in LED which concerns on the comparative example 2 Table showing characteristics of LEDs and color filters in Example 1 and Comparative Examples 1 and 2 of Comparative Experiment 1, and a list of experimental results CIE1931 chromaticity diagram showing the chromaticity region and the standard chromaticity region (each chromaticity coordinate in the table of FIG. 15) in Example 1 and Comparative Examples 1 and 2 of Comparative Experiment 1. CIE 1976 chromaticity diagram showing the chromaticity region and the standard chromaticity region (each chromaticity coordinate in the table of FIG. 15) in Example 1 and Comparative Examples 1 and 2 of Comparative Experiment 1. The disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 2 of this invention. Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal panel Enlarged plan view showing the planar configuration of the array substrate Enlarged plan view showing the planar configuration of the CF substrate The graph which shows the emission spectrum in LED which concerns on Example 2 of the comparative experiment 2, and the transmission spectrum of each coloring part of the color filter which concerns on Example 2. The graph which shows the transmission spectrum of each color of the emitted light of the liquid crystal panel which concerns on Example 2 of the comparative experiment 2, and the emission spectrum in LED which concerns on Example 2. The graph which shows the emission spectrum in LED which concerns on the comparative example 3 of the comparative experiment 2, and the transmission spectrum of each coloring part of the color filter which concerns on the comparative example 3. The graph which shows the transmission spectrum of each color of the emitted light of the liquid crystal panel which concerns on the comparative example 3 of the comparative experiment 2, and the emission spectrum in LED which concerns on the comparative example 3. The graph which shows the emission spectrum in LED which concerns on the comparative example 4 of the comparative experiment 2, and the transmission spectrum of each coloring part of the color filter which concerns on the comparative example 4. The graph which shows the transmission spectrum of each color of the emitted light of the liquid crystal panel which concerns on the comparative example 4 of the comparative experiment 2, and the emission spectrum in LED which concerns on the comparative example 4. Table showing characteristics of LEDs and color filters in Example 2 and Comparative Examples 3 and 4 of Comparative Experiment 2 and a list of experimental results CIE1931 chromaticity diagram showing the chromaticity region and the chromaticity region of each standard (each chromaticity coordinate in the table of FIG. 28) in Example 2 of Comparative Experiment 2 and Comparative Examples 3 and 4. CIE 1976 chromaticity diagram showing the chromaticity region and the chromaticity region of each standard (each chromaticity coordinate in the table of FIG. 28) in Example 2 and Comparative Examples 3 and 4 of Comparative Experiment 2. FIG. 7 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to Embodiment 3 of the present invention. Plan view of backlight device Sectional drawing which shows the cross-sectional structure which cut | disconnected the liquid crystal display device along the long side direction Sectional drawing which shows the cross-sectional structure which cut | disconnected the liquid crystal display device along the short side direction FIG. 6 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to Embodiment 4 of the present invention. Plan view of backlight device Sectional drawing which shows the cross-sectional structure which cut | disconnected the liquid crystal display device along the long side direction Sectional drawing which shows the cross-sectional structure which cut | disconnected the liquid crystal display device along the short side direction

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG.3 and FIG.7 be a front side, and let the lower side of the figure be a back side.

  As shown in FIG. 1, the television receiver 10TV according to the present embodiment receives a liquid crystal display device 10, front and back cabinets 10Ca and 10Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power supply 10P, and a television signal. And a tuner (reception unit) 10T and a stand 10S. The liquid crystal display device (display device) 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole and is accommodated in a vertically placed state. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source. Is supposed to be retained.

  First, the liquid crystal panel 11 will be described. As shown in FIG. 3, the liquid crystal panel 11 includes a liquid crystal material, which is a substance whose optical characteristics change with the application of an electric field, between a pair of transparent (translucent) glass substrates 20 and 21. The liquid crystal layer 22 is enclosed. Of the two substrates 20 and 21 constituting the liquid crystal panel 11, the one disposed on the back side (backlight device 12 side) is the array substrate (TFT substrate, active matrix substrate) 20, and is disposed on the front side (light emitting side). This is a CF substrate (counter substrate) 21. The array substrate 20 and the CF substrate 21 have a horizontally long rectangular shape when seen in a plane, and the long side direction thereof coincides with the X-axis direction and the short side direction thereof coincides with the Y-axis direction. Note that a pair of front and back polarizing plates 23 are respectively attached to the outer surface sides of both the substrates 20 and 21.

  On the inner surface side (the liquid crystal layer 22 side, the surface facing the CF substrate 21) of the array substrate 20, as shown in FIG. 4, a TFT (Thin Film Transistor) 24, which is a switching element having three electrodes 24a to 24c. In addition, a large number of pixel electrodes 25 are arranged in a matrix (matrix shape) along the plate surface of the array substrate 20, and around the TFTs 24 and the pixel electrodes 25, gate wirings 26 and sources forming a lattice shape are provided. The wiring 27 is disposed so as to surround it. The pixel electrode 25 is made of a transparent conductive film such as ITO (Indium Tin Oxide). Both the gate wiring 26 and the source wiring 27 are made of a metal film. The gate wiring 26 and the source wiring 27 are connected to the gate electrode 24a and the source electrode 24b of the TFT 24, respectively, and the pixel electrode 25 is connected to the drain electrode 24c of the TFT 24 via the drain wiring (not shown). The array substrate 20 is provided with a capacitor wiring (auxiliary capacitor wiring, storage capacitor wiring, Cs wiring) 33 that is parallel to the gate wiring 26 and overlaps the pixel electrode 25 in a plan view. The capacitor wiring 33 is arranged alternately with the gate wiring 26 in the Y-axis direction. The gate wiring 26 is disposed between the pixel electrodes 25 adjacent to each other in the Y-axis direction, whereas the capacitor wiring 33 is disposed at a position that substantially crosses the central portion of each pixel electrode 25 in the Y-axis direction. The end portion of the array substrate 20 is provided with a terminal portion routed from the gate wiring 26 and the capacitor wiring 33 and a terminal portion routed from the source wiring 27. Each signal or reference potential is input from a control board that is not to be operated, whereby the driving of each TFT 24 arranged in parallel in a matrix is individually controlled. Further, an alignment film 28 for aligning liquid crystal molecules contained in the liquid crystal layer 22 is formed on the inner surface side of the array substrate 20 (FIG. 3).

  On the other hand, on the inner surface side (the liquid crystal layer 22 side, the surface facing the array substrate 20) of the CF substrate 21, as seen in plan view with each pixel electrode 25 on the array substrate 20 side, as shown in FIGS. 3 and 5. A large number of color filters 29 are arranged in a matrix along the plate surface of the CF substrate 21 at the overlapping positions. In the color filter 29, the colored portions 29R, 29G, and 29B that respectively exhibit red, green, and blue are alternately and repeatedly arranged in the row direction (the X-axis direction and the long side direction of the liquid crystal panel 11). A plurality of colored portions are arranged along the column direction (the Y-axis direction, the short side direction of the liquid crystal panel 11). The color portions 29R, 29G, and 29B constituting the color filter 29 are described in detail later, and selectively transmit light of each color (each wavelength). Further, the outer shape of each of the colored portions 29R, 29G, and 29B has a vertically long rectangular shape as viewed in a plane following the outer shape of the pixel electrode 25. Between the colored portions 29R, 29G, and 29B constituting the color filter 29, a light shielding portion (black matrix) 30 having a lattice shape for preventing color mixture is formed. The light shielding portion 30 is disposed so as to overlap with the gate wiring 26, the source wiring 27, and the capacitor wiring 33 on the array substrate 20 in plan view. Further, as shown in FIG. 3, a counter electrode 31 that faces the pixel electrode 25 on the array substrate 20 side is provided on the surface of the color filter 29 and the light shielding portion 30. An alignment film 32 for aligning liquid crystal molecules contained in the liquid crystal layer 22 is formed on the inner surface side of the CF substrate 21.

  In the liquid crystal panel 11, as shown in FIGS. 3 to 5, a set of three color electrodes 29 R, 29 G, 29 B of three colors of red, green, and blue and three pixel electrodes 25 facing them is used as a display unit. One display pixel 34 is configured, and the display pixels 34 are arranged in parallel in a matrix form in large numbers along the plate surfaces of both the substrates 20 and 21, that is, the display surfaces (X-axis direction and Y-axis direction). ing. The display pixel 34 includes a red pixel 34R composed of a set of a red coloring portion 29R and a pixel electrode 25 facing the red coloring portion 29R, a green pixel 34G composed of a pair of the green coloring portion 29G and the pixel electrode 25 facing the red pixel 34R, and a blue coloring portion. And a blue pixel 34B composed of a set of 29B and the pixel electrode 25 opposed thereto. The red pixel 34R, the green pixel 34G, and the blue pixel 34B constituting the display pixel 34 are repeatedly arranged along the row direction (X-axis direction, long side direction of the liquid crystal panel 11) to form a pixel group. A large number of pixel groups are arranged along the column direction (the Y-axis direction, the short side direction of the liquid crystal panel 11). Then, by controlling the driving of each TFT 24 included in each pixel 34R, 34G, 34B by a control board (not shown), a voltage of a predetermined value is generated between each pixel electrode 25 connected to each TFT 24 and the counter electrode 31. When applied, the alignment state of the liquid crystal layer 22 disposed therebetween changes according to the voltage, and thus the amount of light transmitted through the colored portions 29R, 29G, 29B of the respective colors is individually controlled.

  Next, the backlight device 12 will be described in detail. As shown in FIG. 2, the backlight device 12 includes a chassis 14 having a substantially box shape having a light emitting portion 14 c that opens to the front side, that is, the light emitting side (the liquid crystal panel 11 side), and the light emitting portion of the chassis 14. The optical member 15 arranged so as to cover 14c and the frame 16 for pressing the light guide plate 19 described below from the front side are provided. Further, in the chassis 14, an LED substrate (light source substrate) 18 on which an LED (Light Emitting Diode) 17 as a light source is mounted, and light from the LED 17 is guided to the optical member 15 (the liquid crystal panel 11). , A light guide plate 19 leading to the light emitting side) is accommodated. In the backlight device 12, the LED substrate 18 having the LEDs 17 is arranged in a pair at both ends on the long side, and the light guide plate 19 is connected to the short side by the LED substrate 18 forming the pair. It is sandwiched from both sides of the direction (Y-axis direction, column direction). The LEDs 17 mounted on each LED substrate 18 are unevenly distributed near each end on the long side in the liquid crystal panel 11 and along the direction along the end, that is, along the long side direction (X-axis direction, row direction). Several are arranged side by side at intervals (intermittently). Thus, the backlight device 12 according to the present embodiment is a so-called edge light type (side light type). Below, each component of the backlight apparatus 12 is demonstrated in detail.

  The chassis 14 is made of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC), and as shown in FIGS. And side plates 14b rising from the outer ends of the respective sides (a pair of long sides and a pair of short sides) in the bottom plate 14a toward the front side. The chassis 14 (bottom plate 14a) has a long side direction that coincides with the X-axis direction, and a short side direction that coincides with the Y-axis direction. Substrates such as a control board and an LED drive circuit board (not shown) are attached to the back side of the bottom plate 14a. Further, the frame 16 and the bezel 13 can be screwed to the side plate 14b.

  As shown in FIG. 2, the optical member 15 has a horizontally long rectangular shape in a plan view, like the liquid crystal panel 11 and the chassis 14. The optical member 15 is placed on the front side (light emission side) of the light guide plate 19 and is disposed between the liquid crystal panel 11 and the light guide plate 19 so as to transmit light emitted from the light guide plate 19. At the same time, the transmitted light is emitted toward the liquid crystal panel 11 while giving a predetermined optical action. The optical member 15 is composed of a plurality of (three in the present embodiment) sheet-like members that are stacked on each other. Specific types of the optical member (optical sheet) 15 include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used. In FIG. 7, for convenience sake, the three optical members 15 are simplified to one.

  As shown in FIG. 2, the frame 16 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 19, and the outer peripheral end portion of the light guide plate 19 extends from the front side over substantially the entire circumference. It is possible to hold down. The frame 16 is made of a synthetic resin and has a light shielding property by having a surface with, for example, a black color. As shown in FIG. 7, frame-side reflection sheets 16R for reflecting light are attached to the back side surfaces of both long sides of the frame 16, that is, the surfaces facing the light guide plate 19 and the LED board 18 (LED 17). It has been. The frame-side reflection sheet 16R has a size that extends over almost the entire length of the long side portion of the frame 16, and is in direct contact with the end of the light guide plate 19 that faces the LED 17 and at the same time. These end portions and the LED substrate 18 are collectively covered from the front side. Further, the frame 16 can receive the outer peripheral end of the liquid crystal panel 11 from the back side.

  As shown in FIGS. 2 and 7, the LED 17 is a so-called top surface emitting type in which the LED 17 is surface-mounted and the light emitting surface 17 a faces away from the LED substrate 18. Specifically, as shown in FIG. 8, the LED 17 includes a blue LED element (blue light emitting element, blue LED chip) 40 that is a light source and a sealing material (translucent resin material) that seals the blue LED element 40. 41 and a case (container, housing) 42 in which the blue LED element 40 is accommodated and the sealing material 41 is filled. Hereinafter, the components of the LED 17 will be sequentially described in detail with reference to FIG.

  The blue LED element 40 is a semiconductor made of a semiconductor material such as InGaN, and emits blue light having a wavelength included in a blue wavelength region (about 420 nm to about 500 nm) when a voltage is applied in the forward direction. It is said. The blue LED element 40 is connected to a wiring pattern on the LED substrate 18 disposed outside the case 42 by a lead frame (not shown). In the manufacturing process of the LED 17, the sealing material 41 fills the internal space of the case 42 in which the blue LED element 40 is accommodated, thereby sealing the blue LED element 40 and the lead frame and protecting them. Is done. For the sealing material 41, a green phosphor and a red phosphor, both of which are not shown, are dispersed and blended at a predetermined ratio in a substantially transparent thermosetting resin material (for example, an epoxy resin material, a silicone resin material, etc.) It is configured. The green phosphor emits green light having a wavelength included in the green wavelength region (about 500 nm to about 570 nm) by being excited by the blue light emitted from the blue LED element 40. The red phosphor emits red light having a wavelength included in a red wavelength region (about 600 nm to about 780 nm) when excited by blue light emitted from the blue LED element 40. Accordingly, the emitted light of the LED 17 is blue light (blue component light) emitted from the blue LED element 40, green light (green component light) emitted from the green phosphor, and red light (red light emitted from the red phosphor ( Red component light), and generally white as a whole. That is, the LED 17 emits white light. Since yellow light is obtained by synthesizing the green light emitted from the green phosphor and the red light emitted from the red phosphor, the LED 17 includes the blue component light and the yellow component light from the LED chip. It can be said that it has both. In addition, the chromaticity of the LED 17 changes depending on, for example, the absolute value or relative value of the content in the green phosphor and the red phosphor, and accordingly the content of the green phosphor and the red phosphor is adjusted as appropriate. By doing so, it is possible to adjust the chromaticity of the LED 17. Details of emission spectra of the blue LED element 40, the green phosphor, and the red phosphor will be described in detail later.

  The case 42 is made of a synthetic resin material (for example, a polyamide-based resin material) or a ceramic material having a white surface with excellent light reflectivity. The case 42 has a substantially box shape having an opening 42c on the light emitting side (light emitting surface 17a side, opposite to the LED substrate 18 side) as a whole, and roughly along the mounting surface of the LED substrate 18. It has a bottom wall part 42a that extends and a side wall part 42b that rises from the outer edge of the bottom wall part 42a. Of these, the bottom wall portion 42a has a square shape when viewed from the front (light emission side), whereas the side wall portion 42b has a substantially rectangular tube shape along the outer peripheral edge of the bottom wall portion 42a. From the perspective, it has a rectangular frame shape. A blue LED element 40 is disposed on the inner surface (bottom surface) of the bottom wall portion 42 a constituting the case 42. On the other hand, a lead frame is passed through the side wall portion 42b. Of the lead frame, an end portion arranged in the case 42 is connected to the blue LED element 40, whereas an end portion led out of the case 42 is connected to the wiring pattern of the LED substrate 18.

  As shown in FIGS. 2, 6, and 7, the LED substrate 18 on which a plurality of the LEDs 17 are mounted is arranged in the long side direction of the chassis 14 (the end portion on the LED 17 side in the liquid crystal panel 11 and the light guide plate 19, the X-axis direction). ) Extending along the X-axis direction and the Z-axis direction in parallel, that is, the liquid crystal panel 11 and the light guide plate 19 (optical member 15) plate surfaces. And is accommodated in the chassis 14 in a posture orthogonal to each other. That is, the LED substrate 18 has a posture in which the long side direction on the plate surface coincides with the X-axis direction, the short side direction coincides with the Z-axis direction, and the plate thickness direction orthogonal to the plate surface coincides with the Y-axis direction. It is said. The LED substrate 18 is arranged in a pair in a position sandwiching the light guide plate 19 in the Y-axis direction. Specifically, the LED substrate 18 is interposed between the light guide plate 19 and each side plate 14b on the long side of the chassis 14. The chassis 14 is accommodated from the front side along the Z-axis direction with respect to the chassis 14. Each LED substrate 18 is attached such that the plate surface opposite to the mounting surface 18 a on which the LED 17 is mounted is in contact with the inner surface of each side plate 14 b on the long side of the chassis 14. Accordingly, the light emitting surfaces 17a of the LEDs 17 mounted on the LED substrates 18 are opposed to each other, and the optical axis of each LED 17 substantially coincides with the Y-axis direction (the direction parallel to the plate surface of the liquid crystal panel 11).

  Of the plate surfaces of the LED substrate 18, the plate surface facing inward is opposed to the long side end surface (light incident surface 19 b described later) of the light guide plate 19, as shown in FIGS. 2, 6 and 7. A plurality (20 in FIG. 6) of LEDs 17 are spaced along the long side direction of the LED substrate 18 (the long side direction of the liquid crystal panel 11 and the light guide plate 19 and the X-axis direction) on the plate surface. Are arranged side by side. Each LED 17 is mounted on the surface of the LED substrate 18 facing the light guide plate 19 side (the surface facing the light guide plate 19), and this is the mounting surface 18a. On the mounting surface 18a of the LED substrate 18, a wiring pattern (not shown) made of a metal film (such as copper foil) that extends along the X-axis direction and connects the adjacent LEDs 17 across the LED 17 group in series. The LED driving circuit board (not shown) is electrically connected to the terminal portion formed at the end of the wiring pattern via a wiring member (not shown), etc., so that each LED 17 is driven. It is possible to supply power. The LED substrate 18 is a single-sided mounting type in which only one side of the plate surface is a mounting surface 18a. Further, the interval between the LEDs 17 adjacent in the X-axis direction, that is, the arrangement interval (arrangement pitch) of the LEDs 17 is substantially equal. The base material of the LED substrate 18 is made of a metal such as aluminum, for example, and the wiring pattern (not shown) described above is formed on the surface thereof via an insulating layer. In addition, as a material used for the base material of LED board 18, insulating materials, such as a synthetic resin and a ceramic, can also be used.

  The light guide plate 19 is made of a synthetic resin material (for example, acrylic resin such as PMMA) having a refractive index sufficiently higher than that of air and substantially transparent (excellent translucency). As shown in FIGS. 2 and 6, the light guide plate 19 is formed in a flat plate shape that is horizontally long when viewed in a plane, like the liquid crystal panel 11 and the bottom plate 14a of the chassis 14, so that the X-axis direction and Y While having four end surfaces along the axial direction, the plate surfaces are parallel to the plate surfaces of the liquid crystal panel 11 and the optical member 15 while facing each other. The light guide plate 19 has a long side direction on the plate surface corresponding to the X axis direction, a short side direction corresponding to the Y axis direction, and a plate thickness direction (normal direction of the plate surface) perpendicular to the plate surface being the Z axis. It matches the direction. As shown in FIG. 7, the light guide plate 19 is disposed in the chassis 14 at a position directly below the liquid crystal panel 11 and the optical member 15, and a pair of end faces on the long side of the outer peripheral end faces are long in the chassis 14. The LED board 18 which makes the pair distribute | arranged to the both ends of a side and each LED17 mounted there are each opposingly formed. Therefore, the alignment direction of the LED 17 (LED substrate 18) and the light guide plate 19 matches the Y-axis direction, while the alignment direction of the optical member 15 (liquid crystal panel 11) and the light guide plate 19 matches the Z-axis direction. It is assumed that both directions are orthogonal to each other. The light guide plate 19 introduces light emitted from the LED 17 along the Y-axis direction from the end surface on the long side, and propagates the light to the optical member 15 side (front side, light emission side). It has the function of rising up and emitting from the plate surface.

  Among the plate surfaces of the light guide plate 19 having a flat plate shape, the plate surface facing the front side (the surface facing the liquid crystal panel 11 and the optical member 15) is a front side, as shown in FIGS. That is, the light emitting surface 19a is emitted toward the optical member 15 and the liquid crystal panel 11 side. Of the outer peripheral end surfaces adjacent to the plate surface of the light guide plate 19, the pair of long side end surfaces that form a longitudinal shape along the X-axis direction (the arrangement direction of the plurality of LEDs 17 and the long side direction of the LED substrate 18) The LED 17 (LED substrate 18) is opposed to each other with a predetermined space therebetween, and a pair of light incident surfaces 19b on which light emitted from the LEDs 17 is incident. The frame side reflection sheet 16R described above is arranged on the front side of the space held between the LED 17 and the light incident surface 19b, whereas the frame side reflection sheet 16R is arranged on the back side of the space. The first chassis side reflection sheet 14R1 is disposed so as to sandwich the same space therebetween. Both reflection sheets 14R1 and 16R are arranged in such a manner as to sandwich the LED 17 side end portion of the light guide plate 19 and the LED 17 in addition to the space. Thereby, the light from LED17 can be efficiently incident with respect to the light-incidence surface 19b by repeatedly reflecting between both reflective sheet 14R1, 16R. The light incident surface 19b is a surface that is parallel to the X-axis direction and the Z-axis direction, and is a surface that is substantially orthogonal to the light emitting surface 19a. Further, the alignment direction of the LED 17 and the light incident surface 19b coincides with the Y-axis direction and is parallel to the light emitting surface 19a.

  Of the plate surfaces of the light guide plate 19, the plate surface 19 c opposite to the light emitting surface 19 a can reflect the light in the light guide plate 19 and rise to the front side as shown in FIG. 7. A two-chassis reflection sheet 14R2 is provided so as to cover the entire area. In other words, the second chassis side reflection sheet 14R2 is arranged in a shape sandwiched between the bottom plate 14a of the chassis 14 and the light guide plate 19. A light reflecting portion that scatters and reflects light in the light guide plate 19 is provided on at least one of the plate surface 19c opposite to the light emitting surface 19a in the light guide plate 19 and the surface of the second chassis side reflection sheet 14R2. (Not shown) and the like are patterned so as to have a predetermined in-plane distribution, and thereby, the emitted light from the light emitting surface 19a is controlled to have a uniform distribution in the surface.

  Conventionally, in order to improve color reproducibility of an image displayed on a liquid crystal panel, yellow light from a light source is separated into green and red by a color correction film. However, since the color correction film has a property of absorbing light from the light source over the entire visible light region, there is a possibility that the light use efficiency is deteriorated, resulting in a decrease in luminance or an increase in power consumption. . However, for example, if the color reproducibility is improved by increasing the film thickness of the color filter, the light transmittance of the color filter is reduced, which also results in the deterioration of the light utilization efficiency. .

  Therefore, in the present embodiment, each emission spectrum in the green phosphor and the red phosphor provided in the LED 17 is as follows. That is, as shown in FIG. 9, the green phosphor has an emission spectrum including a peak having a peak wavelength in the range of 520 nm to 540 nm and a half width (full width at half maximum) of less than 60 nm. On the other hand, the red phosphor includes a main peak having a peak wavelength in the range of 629 nm to 635 nm and a half width of less than 10 nm, and further includes a first sub peak having a peak wavelength in the range of 607 nm to 614 nm and a peak. It has an emission spectrum including a second sub-peak whose wavelength is in the range of 645 nm to 648 nm. Specifically, the green phosphor provided in the LED 17 has a peak wavelength included in the emission spectrum of 533 nm in the above wavelength range and a peak half-value width (width from 510 nm to 563 nm) of about 53 nm. It is particularly preferred that The red phosphor provided in the LED 17 has a peak wavelength of the main peak included in the emission spectrum of 630 nm within the above wavelength range, and a half width of the main peak (width from 628 nm to 636 nm) is about 8 nm. It is particularly preferable that the peak wavelength of one sub peak is 613 nm in the above wavelength range, and the peak wavelength of the second sub peak is 647 nm in the above wavelength range. Further, the half width of the main peak included in the emission spectrum of the red phosphor is relatively narrower than the half width of the peak included in the emission spectrum of the green phosphor. With such a configuration, the color purity of the green light emitted from the green phosphor is sufficiently high, and the color purity of the red light emitted from the red phosphor is sufficiently high. As a result, green and red are associated with the chromaticity region relating to the emitted light of the liquid crystal panel 11 obtained by transmitting the light from the LED 17 to the colored portions 29R, 29G, and 29B of each color constituting the color filter 29 of the liquid crystal panel 11. Therefore, the color reproducibility of the image displayed on the liquid crystal panel 11 is improved. Therefore, according to the present embodiment, the use of light is improved as compared with the conventional color correction film or the color filter film having an increased film thickness. The color reproducibility can be improved without losing efficiency.

  The “peak” of the emission spectrum referred to here refers to a peak portion in the emission spectrum, and the “peak wavelength” refers to the wavelength at the apex in the peak portion. FIG. 9 shows the emission spectrum of the LED 17 and the spectral transmittance of the color filter 29. Among these, the spectral transmittance of the color filter 29 is determined based on white light (for example, D65 light source (0.3157, 0.3290), A light source (0.4476, 0.4074), B light source ( 0.3484, 0.3516) and a C light source (0.3101, 0.3161) are transmitted through the color filter 29. The horizontal axis in FIG. 9 indicates the wavelength (unit: nm). On the other hand, there are two types of units of the vertical axis in FIG. "Light emission intensity (no unit)" is shown on the right side of the figure as a unit corresponding to the emission spectrum of the LED 17 described later.

Subsequently, the green phosphor and the red phosphor will be sequentially described in detail. The green phosphor contains at least a sialon phosphor that is a kind of oxynitride phosphor. The sialon-based phosphor is a material obtained by replacing a part of silicon nitride silicon atoms with aluminum atoms and a part of nitrogen atoms with oxygen atoms, that is, an oxynitride. A sialon-based phosphor that is an oxynitride has excellent luminous efficiency and durability compared to other phosphors made of, for example, sulfide or oxide. Here, “excellent in durability” specifically means that, even when exposed to high-energy excitation light from an LED chip, the luminance does not easily decrease over time. In addition, green light with high color purity can be emitted by sufficiently narrowing the half width of the peak included in the emission spectrum. For sialon phosphors, rare earth elements (eg, Tb, Yg, Ag, etc.) are used as activators. The sialon phosphor constituting the green phosphor according to the present embodiment is β-SiAlON. β-SiAlON is a kind of sialon-based phosphor, and a general formula Si _6-z Al _z O _z N _{8-z in} which aluminum and oxygen are dissolved in β-type silicon nitride crystal (z indicates a solid solution amount). ) Or (Si, Al) ₆ (O, N) ₈ . For example, Eu (europium), which is a kind of rare earth element, is used as an activator in β-SiAlON according to the present embodiment. Thereby, since the half width of the peak included in the emission spectrum becomes narrower, green light with high color purity can be emitted.

The red phosphor contains at least a double fluoride phosphor. This double fluoride phosphor has a general formula A ₂ MF ₆ (M is one or more selected from Si, Ti, Zr, Hf, Ge and Sn, and A is selected from Li, Na, K, Rb and Cs 1 Represented by species or more). Since this bifluoride phosphor has a sufficiently narrow half width of the main peak included in the emission spectrum, it can emit red light with high color purity. Further, since it is difficult to absorb the green light emitted from the green phosphor, the utilization efficiency of the green light is kept high. The double fluoride phosphor is potassium silicofluoride (K ₂ SiF ₆ : Mn) using manganese as an activator. Such potassium silicofluoride does not use an expensive rare earth element as a material, so that the manufacturing cost of the red phosphor and the LED 17 is low. The emission spectrum of potassium silicofluoride, which is this double fluoride phosphor, is characteristic. As shown in FIG. 9, one main peak, one on the long wavelength side and one on the short wavelength side. Each sub-peak (first sub-peak and second sub-peak) is included.

  Furthermore, in the LED 17 according to the present embodiment, the blue LED element 40 provided in addition to the above-described green phosphor and red phosphor has the following emission spectrum. That is, the blue LED element 40 has an emission spectrum including a peak whose peak wavelength is in a range of 430 nm to 460 nm which is a blue wavelength region. Specifically, the blue LED element 40 is preferably configured to have an emission spectrum including a peak having a peak wavelength of 444 nm and a half width (width from 435 nm to 455 nm) of about 20 nm. The blue light emitted from the blue LED element 40 has a sufficiently narrow half-value width at the peak of the emission spectrum, a high color purity, and a sufficiently high luminance. Therefore, the green phosphor and the red phosphor are efficiently used. To emit green light and red light, and the color purity of the blue light from the LED 17 is high.

  The colored portions 29R, 29G, and 29B constituting the color filter 29 included in the liquid crystal panel 11 that displays an image by the light from the LED 17 having the above-described configuration have the following transmission spectrum. Yes. That is, as shown in FIG. 9, the green colored portion 29G exhibiting green selectively transmits light in the green wavelength region (about 500 nm to about 570 nm), that is, green light, and its transmission spectrum. The peak wavelength of the peak included in the range is 510 nm to 550 nm, and the full width at half maximum of the peak is less than 110 nm. Specifically, the green colored portion 29G preferably includes a transmission spectrum including a peak having a peak wavelength of 530 nm and a half-value width (width from 488 nm to 580 nm) of approximately 92 nm. That is, since the transmission spectrum related to the green colored portion 29G includes the peak of the emission spectrum of the green phosphor over the entire region, green light with high color purity in the light emitted from the LED 17 is converted into the green colored portion. 29G is efficiently transmitted. Thereby, while the utilization efficiency which concerns on the green light from LED17 can be kept higher, the green color gamut in the chromaticity area | region which concerns on the emitted light of the liquid crystal panel 11 becomes wide, and it is more excellent in color reproducibility. The “peak” of the transmission spectrum referred to here refers to a peak portion in the transmission spectrum, and the “peak wavelength” refers to a wavelength at the apex in the peak portion.

  As shown in FIG. 9, the red colored portion 29 </ b> R that exhibits red color selectively transmits light in the red wavelength region (about 600 nm to about 780 nm), that is, red light, and is included in the transmission spectrum. The peak rising position is 560 nm or more, and the wavelength at which the half value of the peak (half value of the maximum value of spectral transmittance) is 580 nm or more is configured. Specifically, the red colored portion 29R is preferably configured to have a transmission spectrum in which the peak rising position is about 566 nm and the half-peak wavelength is about 588 nm. That is, the transmission spectrum related to the red colored portion 29R includes the main peak, the first sub peak, and the second sub peak of the emission spectrum of the red phosphor over the entire region. Red light with high color purity is efficiently transmitted through the red colored portion 29R. As a result, the utilization efficiency related to the red light from the LED 17 can be kept higher, and the red color gamut in the chromaticity region related to the emitted light of the liquid crystal panel 11 becomes wider, and the color reproducibility is more excellent.

  As shown in FIG. 9, the blue colored portion 29 </ b> B exhibiting blue color selectively transmits light in the blue wavelength region (about 420 nm to about 500 nm), that is, blue light, and is included in the transmission spectrum. The peak wavelength of the peak is in the range of 440 nm to 480 nm, and the full width at half maximum of the peak is less than 110 nm. Specifically, it is preferable that the blue colored portion 29B has a transmission spectrum that includes a peak with a peak wavelength of 455 nm and a half width (width from 404 nm to 509 nm) of about 105 nm. That is, since the transmission spectrum related to the blue coloring portion 29B includes the peak of the emission spectrum of the blue LED element 40 over the entire region, blue light with high color purity in the light emitted from the LED 17 is colored blue. The portion 29B is efficiently transmitted. As a result, the utilization efficiency related to the blue light from the LED 17 can be kept higher, and the blue color gamut in the chromaticity region related to the light emitted from the liquid crystal panel 11 becomes wider, and the color reproducibility is superior.

Here, the following comparative experiment 1 was performed in order to obtain knowledge regarding what the light utilization efficiency and color reproducibility would be by configuring the LED 17 and the color filter 29 as described above. . In this comparative experiment 1, the liquid crystal display device 10 including the backlight device 12 having the LED 17 and the liquid crystal panel 11 having the color filter 29 described before this paragraph is referred to as the first embodiment, and the same as the first embodiment. A liquid crystal display device using a liquid crystal panel but having each phosphor in the backlight device changed is referred to as comparative example 1, and a liquid crystal display device in which the color filter of the liquid crystal panel is changed is referred to as comparative example 2. . The liquid crystal display device 10 according to Example 1 is the same as that described before this paragraph, and the green phosphor provided in the LED 17 is a peak of the peak included in the emission spectrum as shown in FIGS. 9 and 15. Whereas the wavelength is 533 nm and the half width is about 53 nm, the red phosphor has a peak wavelength of a main peak included in the emission spectrum of 630 nm and a half width of about 8 nm. The peak wavelength of the sub peak is 613 nm, and the peak wavelength of the second sub peak is 647 nm. Further, the blue LED element 40 included in the LED 17 according to Example 1 has a peak peak wavelength of 444 nm and a half width of about 20 nm. In the liquid crystal display device according to Comparative Example 1, the green phosphor included in the LED is composed of β-SiAlON having an emission spectrum with a peak wavelength of 540 nm, as shown in FIGS. 11 and 15, and the red phosphor is It is made of CaAlSiN ₃ : Eu, which is a kind of cousin phosphor having an emission spectrum with a peak wavelength of 650 nm. Further, the blue LED element included in the LED according to Comparative Example 1 has a peak peak wavelength of 444 nm and a half width of about 20 nm. Except for this LED, the other configurations of the liquid crystal display device according to Comparative Example 1 are the same as those of the liquid crystal display device 10 according to Example 1. As shown in FIGS. 13 and 15, the liquid crystal display device according to Comparative Example 2 includes the same LED as that of Comparative Example 1, and the film thicknesses of the three colored portions constituting the color filter are the same as those in Example 1 and Specifically, the difference is 27% (the film thickness of each colored portion of the color filter of the liquid crystal display device according to Example 1 and Comparative Example 1 is 100%). Relative value). Except for this color filter, the other configurations of the liquid crystal display device according to Comparative Example 2 are the same as those of the liquid crystal display device according to Comparative Example 1. 11 shows the emission spectrum of the LED of Comparative Example 1 and the spectral transmittance of the color filter of Comparative Example 1. FIG. 13 shows the emission spectrum of the LED of Comparative Example 2 and Comparative Example 2. The spectral transmittance of the color filter. The horizontal axis and horizontal axis in FIGS. 11 and 13 are the same as those in FIG. In FIG. 13, the spectral transmittances of the color filters of Comparative Example 1 and Example 1 are indicated by thin lines (thin broken lines, thin one-dot chain lines, and thin two-dot chain lines) for reference.

  And in this comparative experiment 1, in each liquid crystal display device according to Example 1 and Comparative Examples 1 and 2 having the above-described configuration, the chromaticity of the LED, the luminance ratio of the outgoing light from the liquid crystal panel, and the outgoing light In addition to measuring each chromaticity, the NTSC ratio of the chromaticity region related to the emitted light, BT. 709 ratio, DCI ratio, and BT. The 2020 ratio is calculated, and the results are shown in FIG. 10, FIG. 12, and FIG. FIG. 10 shows the transmission spectrum of each color in the emitted light of the liquid crystal panel 11 of Example 1, and shows the emission spectrum of the LED 17 same as FIG. 9 for reference. FIG. 12 shows the transmission spectrum of each color in the emitted light of the liquid crystal panel of Comparative Example 1, and shows the emission spectrum of the same LED as FIG. 11 for reference. FIG. 14 shows the transmission spectrum of each color in the light emitted from the liquid crystal panel of Comparative Example 2, and also shows the emission spectrum of the same LED as FIG. 13 for reference. In addition, the horizontal axis in FIGS. 10, 12 and 14 indicates the wavelength (unit: nm), and the vertical axis indicates the spectral transmittance (no unit) of the emitted light from the liquid crystal panel. FIGS. 16 and 17 show chromaticity regions according to standards, which will be described in detail later, and chromaticity regions of light emitted from the liquid crystal panels of the liquid crystal display devices according to Example 1 and Comparative Examples 1 and 2. Yes.

  The chromaticity of the LED is obtained by measuring light emitted from the LED with, for example, a spectrocolorimeter. The luminance ratio of the light emitted from the liquid crystal panel was measured for each of the liquid crystal display devices according to Example 1 and Comparative Examples 1 and 2 in a state where the liquid crystal panel was displayed in white so as to have the highest luminance. These are relative values based on the luminance value in Comparative Example 1 as a reference (100%). The chromaticity of the light emitted from the liquid crystal panel is determined by displaying the white color on the liquid crystal panel, displaying the red primary color on the liquid crystal panel, displaying the green primary color, and displaying the blue primary color. In this state, the light transmitted through the color filter is measured by a spectrocolorimeter or the like. NTSC ratio in the chromaticity region relating to the light emitted from the liquid crystal panel, BT. 709 ratio, DCI ratio, and BT. The 2020 ratio is an area ratio with respect to each standard of the chromaticity region related to the emitted light of the liquid crystal panel in the liquid crystal display devices according to the first embodiment and the comparative examples 1 and 2. The chromaticity area related to the light emitted from the liquid crystal panel is the chromaticity when the primary color of red is displayed on the liquid crystal panel (the chromaticity of red and the primary color of red) and the chromaticity when the primary color of green is displayed. (Green chromaticity, green primary color point) and chromaticity when blue primary color is displayed (blue chromaticity, blue primary color point) are measured respectively, and each chromaticity is shown in each chromaticity diagram. This is a triangular area with each chromaticity as a vertex that appears when plotted in.

  FIG. 16 is a CIE (Commission Internationale de l'Eclairage) 1931 chromaticity diagram, where the horizontal axis is the x value and the vertical axis is the y value. FIG. 17 is a CIE 1976 chromaticity diagram, where the horizontal axis represents the u ′ value and the vertical axis represents the v ′ value. The x and y values in FIGS. 15 and 16 are values of chromaticity coordinates in the CIE 1931 chromaticity diagram shown in FIG. On the other hand, the u ′ value and the v ′ value in FIGS. 15 and 17 are values of chromaticity coordinates in the CIE 1976 chromaticity diagram shown in FIG. Further, the X value, Y value, and Z value in FIG. 15 are tristimulus values in the XYZ color system, and among these, the Y value is particularly used as an index of brightness, that is, luminance. Also in the present embodiment, the luminance ratio of the emitted light is calculated based on the Y value in “the chromaticity of the emitted light during white display”. Further, the x value and the y value can be expressed using the above-described X value, Y value, and Z value, and are as shown in the following formulas (1) and (2). Similarly, the u ′ value and the v ′ value can also be expressed by using the above-described X value, Y value, and Z value, as shown in the following formulas (3) and (4).

[Equation 1]
x = X / (X + Y + Z) (1)

[Equation 2]
y = Y / (X + Y + Z) (2)

[Equation 3]
u ′ = 4X / (X + 15Y + 3Z) (3)

[Equation 4]
v '= 9Y / (X + 15Y + 3Z) (4)

  The above-mentioned NTSC ratio is the ratio of the area ratio in the chromaticity region when the area of the NTSC chromaticity region according to the NTSC (National Television System Standardization Committee) standard is set as a reference (100%). That is. BT. 709 ratio refers to BT. ITU-R (International Telecommunication Union Radiocommunications Sector). BT. It is an area ratio in the chromaticity region when the area of the 709 chromaticity region is set as a reference (100%). The DCI ratio is an area ratio in the chromaticity region when the area of the DCI chromaticity region according to the DCI (Digital Cinema Initiative) standard is used as a reference (100%). BT. The 2020 ratio is BT. Which was established by ITU-R (International Telecommunication Union Radiocommunications Sector). BT. It is an area ratio in the chromaticity region when the area of the 2020 chromaticity region is set as a reference (100%). 16 and 17, BT. The 709 chromaticity region is indicated by a thin two-dot chain line, the NTSC chromaticity region is indicated by a one-dot chain line, the DCI chromaticity region is indicated by a broken line, and the BT. The 2020 chromaticity region is illustrated by a thick two-dot chain line. Each chromaticity according to the first embodiment is indicated by a round plot, and the chromaticity region according to the first embodiment is indicated by a thin broken line. Each chromaticity according to Comparative Example 1 is indicated by a rhombus plot, and the chromaticity region according to Comparative Example 1 is indicated by a solid line. Each chromaticity according to Comparative Example 2 is indicated by a triangular plot, and the chromaticity region according to Comparative Example 2 is indicated by a thick broken line.

  Then, the experimental result of the comparative experiment 1 is demonstrated. First, the NTSC ratio, BT. 709 ratio, DCI ratio, and BT. Regarding the 2020 ratio, as shown in FIGS. 15 to 17, Comparative Example 1 has the lowest value, while Comparative Example 2 and Example 1 are both higher values than Comparative Example 1. In addition, the values are substantially equivalent to each other (specifically, the NTSC ratio, the BT.709 ratio, the DCI ratio, and the BT.2020 ratio in the CIE 1931 chromaticity diagram are higher values in the first embodiment). In particular, regarding the DCI ratio in the CIE 1976 chromaticity diagram, it can be said that both Comparative Example 2 and Example 1 have “100%”, that is, a color reproduction range equivalent to the DCI chromaticity region according to the DCI standard ( For details, see the column “DCI ratio: CIE 1976 chromaticity diagram” in the second row from the top in FIG. In Comparative Example 2, by increasing the film thickness of each colored portion of the color filter as compared with Comparative Example 1 and Example 1, more light that causes a decrease in color purity of each color is absorbed by each colored portion. This is considered to be because the color purity of the light transmitted through each colored portion was improved. On the other hand, in Example 1, although the film thickness of each coloring part 29R, 29G, 29B of the color filter 29 is equivalent to that of Comparative Example 1, the green phosphor and red phosphor provided in the LED 17 are different. The color purity of light emitted from each of these phosphors is higher. Specifically, as shown in FIG. 9, the emission spectrum of the green phosphor of the LED 17 according to Example 1 is almost entirely contained in the transmission spectrum of the green coloring portion 29G, but the transmission spectrum of the red coloring portion 29R The overlapping range is smaller than those of Comparative Examples 1 and 2 (see FIGS. 11 and 13). The above overlapping range will be described in more detail. The intersection of the emission spectrum of the green phosphor of the LED 17 according to Example 1 and the transmission spectrum of the red colored portion 29R is longer than the intersection of Comparative Examples 1 and 2. It is a lower position (close to 0) in the axial direction. Thereby, although the green light with high color purity emitted from the green phosphor is efficiently transmitted through the green colored portion 29G, it hardly passes through the red colored portion 29R and is more efficiently transmitted through the red colored portion 29R. Therefore, the green chromaticity in the light emitted from the liquid crystal panel 11 becomes extremely high in color purity, and the green color gamut is expanded. Furthermore, although the emission spectrum of the red phosphor of the LED 17 according to Example 1 is almost entirely included in the transmission spectrum of the red coloring portion 29R, the overlapping range with the transmission spectrum of the green coloring portion 29G is Comparative Example 1. , 2 (see FIGS. 11 and 13). The above overlapping range will be described in more detail. The intersection of the emission spectrum of the red phosphor of the LED 17 according to Example 1 and the transmission spectrum of the green coloring portion 29G is longer than the intersection of Comparative Examples 1 and 2. It is a lower position (close to 0) in the axial direction. As a result, red light having a high color purity emitted from the red phosphor is efficiently transmitted through the red colored portion 29R, but hardly transmitted through the green colored portion 29G and more efficiently by the green colored portion 29G. Therefore, the red chromaticity in the light emitted from the liquid crystal panel 11 has extremely high color purity, and the red color gamut is expanded. As described above, the light emitted from the liquid crystal panel 11 according to the first embodiment has high color reproducibility by extending the green and red color gamuts as shown in FIGS. 16 and 17. Therefore, the chromaticity region is equivalent to that of the comparative example 2, and 100% can be achieved in the DCI ratio of the CIE 1976 chromaticity diagram.

  On the other hand, as shown in FIG. 15, the luminance of the emitted light from the liquid crystal panel is reduced to “92%” in Comparative Example 2 as compared to “100%” in Comparative Example 1 as a reference, In Example 1, it is improved to “103%” (for details, see the column “Luminance ratio of emitted light” in the uppermost part of FIG. 15). This is because in Comparative Example 2, the film thickness of each colored portion of the color filter was increased by 27% compared to Comparative Example 1 and Example 1, so that a relatively large amount of light was transmitted when light passed through each colored portion. It is considered that the light utilization efficiency is reduced due to the absorption of light, and as a result, the luminance of the emitted light from the liquid crystal panel is lowered. On the other hand, in Example 1, since the film thickness of each colored portion 29R, 29G, 29B of the color filter 29 is the same as that in Comparative Example 1, the amount of light absorbed by each colored portion 29R, 29G, 29B is a comparative example. 1 is substantially the same as each emission spectrum of the green phosphor and the red phosphor of the LED 17 of Example 1, but is included in each transmission spectrum of the green coloring portion 29G and the red coloring portion 29R, respectively. Therefore, it is considered that the green light and the red light from the LED 17 are transmitted through the green coloring portion 29G and the red coloring portion 29R with high efficiency, and thus the luminance of the emitted light from the liquid crystal panel 11 is improved. As described above, according to the liquid crystal display device 10 according to the first embodiment, the luminance of the emitted light is not impaired, but rather the luminance can be improved, and the color reproducibility can be improved. it can.

  As described above, the liquid crystal display device (display device) 10 of the present embodiment emits green light by being excited by the blue LED element (blue light emitting element) 40 that emits blue light and the blue light from the blue LED element 40. A green phosphor that emits light, including a peak having a peak wavelength in the range of 520 nm to 540 nm and a half-value width of less than 60 nm, and excited by blue light from the blue LED element 40 Red phosphor that emits red light, including a main peak with a peak wavelength in the range of 629 nm to 635 nm, a half width of less than 10 nm, and a peak wavelength in the range of 607 nm to 614 nm. A red fluorescent light having an emission spectrum including a first sub-peak and a second sub-peak having a peak wavelength in the range of 645 nm to 648 nm A backlight device (illumination device) 12 including an LED (light source) 17 having a body, and a color filter 29 including a plurality of coloring portions 29R, 29G, and 29B that exhibit at least blue, green, and red, and a backlight. A liquid crystal panel (display panel) 11 that performs display using light from the device 12.

  In this way, when the light emitted from the LED 17 provided in the backlight device 12 is supplied to the liquid crystal panel 11, the light is provided in the liquid crystal panel 11 and a plurality of colors exhibiting at least blue, green, and red. An image is displayed on the liquid crystal panel 11 by being transmitted through the color filter 29 including the portions 29R, 29G, and 29B and emitted from the liquid crystal panel 11. Here, the LED 17 included in the backlight device 12 includes blue light emitted from the blue LED element 40, green light emitted from the green phosphor excited by the blue light, and red phosphor excited by the blue light. The emitted red light and the light that is generally white as a whole are emitted.

  The green phosphor included in the LED 17 has a light emission spectrum including a peak having a peak wavelength in the range of 520 nm to 540 nm and a half width of less than 60 nm. Therefore, the green phosphor is emitted from the green phosphor. The color purity of green light is sufficiently high. In addition, the red phosphor included in the LED 17 includes a main peak having a peak wavelength in a range of 629 nm to 635 nm, a half width of less than 10 nm, and further a peak wavelength in a range of 607 nm to 614 nm. Since it has an emission spectrum including the first sub-peak and the second sub-peak having a peak wavelength in the range of 645 nm to 648 nm, the color purity of the red light emitted from the red phosphor is sufficiently high. In particular, when the half-width at the main peak of the emission spectrum of the red phosphor is set to less than 10 nm, a higher color purity is obtained as compared with a case where the half-width is larger than that. Moreover, since the peak wavelength at the main peak of the emission spectrum of the red phosphor is set to be equal to or greater than the lower limit (629 nm) of the numerical range described above, the hue is closer to yellow than when the wavelength is shorter than that. Misalignment can be avoided. Furthermore, since the peak wavelength at the main peak of the emission spectrum of the red phosphor is set to be not more than the upper limit (635 nm) of the numerical range described above, the peak of visibility is higher than when the wavelength is longer than that. Therefore, the brightness of red light is sufficiently obtained. Further, since the half width at the peak of the emission spectrum of the green phosphor is less than 60 nm, a higher color purity is obtained as compared with a case where the half width is larger than that. In addition, when the peak wavelength of the emission spectrum of the green phosphor is set to be equal to or greater than the lower limit (520 nm) of the numerical range described above, the hue may be shifted closer to blue than when the wavelength is shorter than that. In addition to being avoided, the brightness of the green light can be sufficiently obtained by being closer to the visibility peak of 555 nm. In addition, when the peak wavelength of the emission spectrum of the green phosphor is set to the upper limit (540 nm) of the above numerical range, the hue may be shifted to yellow as compared with the case where the wavelength is longer than that. can avoid. As a result, regarding the chromaticity region relating to the emitted light of the liquid crystal panel 11 obtained by transmitting the light from the LED 17 to the colored portions 29R, 29G, and 29B of each color constituting the color filter 29, the green and red color gamuts are Since each is expanded, the color reproducibility of the image displayed on the liquid crystal panel 11 is improved. Therefore, compared to the conventional color correction film, or by increasing the film thickness of the color filter 29, the color reproducibility can be improved without impairing the light use efficiency. The reproducibility can be improved. Thus, the chromaticity region in the light emitted from the liquid crystal panel 11 is at least equal to or greater than the DCI chromaticity region according to the DCI (Digital Cinema Initiative) standard in the CIE 1976 chromaticity diagram (area ratio is 100% or 100% or more). Thus, high color reproducibility can be obtained.

  The green phosphor contains an oxynitride phosphor. In this way, for example, compared with the case where a phosphor made of sulfide or oxide is used, the light emission efficiency is excellent and the durability is excellent.

  The oxynitride phosphor is composed of a sialon phosphor. In this way, green light with high color purity can be emitted by sufficiently narrowing the half width of the peak included in the emission spectrum.

  The sialon-based phosphor is β-SiAlON using europium as an activator. If it does in this way, luminous efficiency and durability will become more excellent. In addition, green light with high color purity can be emitted by narrowing the half width of the peak included in the emission spectrum.

  The red phosphor contains a double fluoride phosphor. In this way, red light with high color purity can be emitted by sufficiently narrowing the half width of the main peak included in the emission spectrum. Further, since it is difficult to absorb the green light emitted from the green phosphor, the utilization efficiency of the green light is kept high.

  The double fluoride phosphor is potassium silicofluoride using manganese as an activator. In this way, since an expensive rare earth element is not used as the material, the manufacturing cost relating to the red phosphor and the LED 17 becomes low.

  In addition, the green colored portion 29G exhibiting green in the color filter 29 has a transmission spectrum including a peak having a peak wavelength in the range of 510 nm to 550 nm and a half width of less than 110 nm. In this way, since the peak of the emission spectrum of the green phosphor is included in the entire transmission spectrum of the green colored portion 29G exhibiting green, green light with high color purity emitted from the LED 17 is green. Is efficiently transmitted through the green colored portion 29G. Thereby, while the utilization efficiency which concerns on the green light from LED17 can be kept higher, the green color gamut in the chromaticity area | region which concerns on the emitted light of the liquid crystal panel 11 becomes wide, and it is more excellent in color reproducibility.

  In addition, the red colored portion 29 </ b> R that exhibits red in the color filter 29 has a transmission spectrum in which the peak rising position is 560 nm or more. In this case, the main spectrum, the first sub-peak, and the second sub-peak of the emission spectrum of the red phosphor are included in the transmission spectrum of the red coloring portion 29R exhibiting red color over the entire region. The red light with high color purity thus transmitted efficiently passes through the red colored portion 29R exhibiting red. As a result, the utilization efficiency related to the red light from the LED 17 can be kept higher, and the red color gamut in the chromaticity region related to the emitted light of the liquid crystal panel 11 becomes wider, and the color reproducibility is more excellent.

  The blue LED element 40 has an emission spectrum including a peak having a peak wavelength in the range of 430 nm to 460 nm. In this way, the green phosphor and the red phosphor can be efficiently excited by the blue light emitted from the blue LED element 40 to emit the green light and the red light.

  Moreover, the blue coloring part 29B which exhibits blue among the color filters 29 has a transmission spectrum which includes a peak whose peak wavelength is in the range of 440 nm to 480 nm and whose half width is less than 110 nm. In this way, since the peak of the emission spectrum of the blue LED element 40 is included in the entire transmission spectrum of the blue colored portion 29B exhibiting blue, blue light with high color purity emitted from the LED 17 is It efficiently transmits through the blue colored portion 29B exhibiting blue. As a result, the utilization efficiency related to the blue light from the LED 17 can be kept higher, and the blue color gamut in the chromaticity region related to the light emitted from the liquid crystal panel 11 becomes wider, and the color reproducibility is superior.

  Further, the backlight device 12 is arranged in a shape facing the LED 17, and has a light incident surface 19 b on which light from the LED 17 is incident on the end surface, and is arranged in a shape facing the plate surface of the liquid crystal panel 11. The light guide plate 19 is provided with a light exit surface 19 a that emits light toward the liquid crystal panel 11. In this way, the light emitted from the LED 17 enters the light incident surface 19 b provided on the end surface of the light guide plate 19, propagates through the light guide plate 19 and is diffused, and then the plate of the light guide plate 19. The light is emitted as planar light from the light exit surface 19 a provided on the surface and irradiated onto the liquid crystal panel 11. According to such an edge light type backlight device 12, when using a plurality of LEDs 17 as compared with the direct type, the number of LEDs 17 is reduced and the luminance uniformity related to the emitted light is sufficiently increased. be able to.

  The television receiver 10TV according to the present embodiment includes the above-described liquid crystal display device 10 and a tuner (reception unit) 10T that can receive a television signal. According to such a television receiver 10TV, a television image with high luminance and excellent color reproducibility can be displayed.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a color filter 129 of the liquid crystal panel 111 is added with a yellow coloring portion 129Y to form four colors. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  In the television receiver 110TV and the liquid crystal display device 110 according to the present embodiment, as shown in FIG. 18, a video conversion circuit board that converts a television video signal output from the tuner 110T into a video signal for the liquid crystal display device 110 110 VC is provided. Specifically, the video conversion circuit board 110VC converts the TV video signal output from the tuner 110T into a video signal of each color of blue, green, red, and yellow, and the generated video signal of each color is connected to the liquid crystal panel 111. Can be output to the control board. The television receiver 110TV includes a pair of cabinets 110Ca and 110Cb, a power source 110P, and a stand 110S that have the same configuration as that of the first embodiment.

  On the inner surface of the CF substrate 121 constituting the liquid crystal panel 111, that is, the surface on the liquid crystal layer 122 side (the surface facing the array substrate 120), as shown in FIGS. Corresponding to 125 (see FIG. 20), a color filter 129 is provided in which a large number of colored portions 129R, 129G, 129B, and 129Y are arranged in a matrix (matrix). The color filter 129 according to the present embodiment includes a yellow coloring portion 129Y exhibiting yellow in addition to the red coloring portion 129R, the green coloring portion 129G, and the blue coloring portion 129B that are the three primary colors of light. The yellow colored portion 129Y will be described in detail later. Each colored portion 129R, 129G, 129B, and 129Y has a vertically long (longitudinal) rectangular shape (rectangular shape) in which the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction, similarly to the pixel electrode 125. I am doing. A lattice-shaped light shielding portion 130 is provided between the coloring portions 129R, 129G, 129B, and 129Y to prevent color mixing.

  The arrangement and size of the coloring portions 129R, 129G, 129B, and 129Y constituting the color filter 129 will be described in detail. As shown in FIG. 21, the coloring portions 129R, 129G, 129B, and 129Y are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction. , 129Y, the dimensions in the column direction (Y-axis direction) are all the same, but the dimensions in the row direction (X-axis direction) are different for each colored portion 129R, 129G, 129B, 129Y. Specifically, the colored portions 129R, 129G, 129B, and 129Y are arranged along the row direction in the order of the red colored portion 129R, the green colored portion 129G, the blue colored portion 129B, and the yellow colored portion 129Y from the left side shown in FIG. Among these, the dimension in the row direction of the red coloring portion 129R and the blue coloring portion 129B is relatively larger than the dimension in the row direction of the yellow coloring portion 129Y and the green coloring portion 129G. That is, the colored portions 129R and 129B having relatively large dimensions in the row direction and the colored portions 129G and 129Y having relatively small dimensions in the row direction are alternately and repeatedly arranged in the row direction. Thereby, the area of the red coloring part 129R and the blue coloring part 129B is made larger than the areas of the green coloring part 129G and the yellow coloring part 129Y. The areas of the blue colored portion 129B and the red colored portion 129R are equal to each other. Similarly, the areas of the green colored portion 129G and the yellow colored portion 129Y are equal to each other. 19 and 21 illustrate a case where the areas of the red coloring portion 129R and the blue coloring portion 129B are about 1.6 times the areas of the yellow coloring portion 129Y and the green coloring portion 129G.

  As the color filter 129 is configured as described above, in the array substrate 120, as shown in FIG. 20, the dimension in the row direction (X-axis direction) of the pixel electrode 125 is different depending on the column. . That is, among the pixel electrodes 125, the size and area in the row direction of the ones overlapping with the red coloring portion 129R and the blue coloring portion 129B are larger than the size and area in the row direction of those overlapping with the yellow coloring portion 129Y and the green coloring portion 129G. Is also relatively large. In the liquid crystal panel 111, a yellow pixel 134Y is configured by a set of the yellow colored portion 129Y and the pixel electrode 125 facing the yellow colored portion 129Y. That is, the display pixel 134 of the liquid crystal panel 111 includes a red pixel 134R, a green pixel 134G, a blue pixel 134B, and a yellow pixel 134Y. The gate lines 126 are all arranged at an equal pitch, while the source lines 127 are arranged at two different pitches according to the dimensions of the pixel electrodes 125 in the row direction. In the present embodiment, the auxiliary capacitance wiring is not shown.

  The liquid crystal panel 111 having such a configuration is driven when a signal from a control board (not shown) is input, and the control board outputs the signal from the tuner 110T in the video conversion circuit board 110VC shown in FIG. Each color video signal generated by converting the generated television video signal into a video signal of each color of blue, green, red, and yellow is input, so that the liquid crystal panel 111 can color each color. The amount of light transmitted through the sections 129R, 129G, 129B, and 129Y is appropriately controlled. Since the color filter 129 of the liquid crystal panel 111 has the yellow colored portions 129Y in addition to the colored portions 129R, 129G, and 129B that are the three primary colors of light, the color gamut of the display image displayed by the transmitted light is It has been expanded, so that it is possible to realize a display superior in color reproducibility. Moreover, since the light transmitted through the yellow colored portion 129Y has a wavelength close to the peak of visibility, the human eye tends to perceive brightly even with a small amount of energy. Thereby, even if it suppresses the output of LED which the backlight apparatus which is not shown in figure, sufficient brightness | luminance can be obtained, the power consumption of LED can be reduced and the effect that it is excellent also in environmental performance is acquired.

  Of the colored portions 129R, 129G, 129B, and 129Y constituting the color filter 129 provided in the liquid crystal panel 111 having the above-described configuration, the yellow colored portion 129Y has the following transmission spectrum. That is, as shown in FIG. 22, the yellow colored portion 129Y exhibiting yellow is supposed to selectively transmit light in the yellow wavelength region (580 nm to 600 nm), that is, yellow light, and is included in the transmission spectrum. The peak rising position is in the range of 460 nm to 560 nm, and the half-peak wavelength is in the range of 480 nm to 580 nm. Specifically, the yellow colored portion 129Y is preferably configured to have a transmission spectrum in which the peak rising position is about 470 nm and the half-peak wavelength is about 506 nm. That is, the transmission spectrum related to the yellow colored portion 129Y includes the emission spectrum peak of the green phosphor over the entire region, and the main peak, the first sub peak, and the second sub peak of the emission spectrum of the red phosphor over the entire region, respectively. Since it is contained, green light and red light of high color purity in light emitted from an LED (not shown) are efficiently transmitted through the yellow colored portion 129Y. As a result, the utilization efficiency relating to the green light and the red light from the LEDs can be kept higher, and the yellow color gamut in the chromaticity region relating to the emitted light of the liquid crystal panel 11 becomes wider, and the color reproducibility is superior. . Note that the horizontal axis and the horizontal axis in FIG. 22 are the same as those in FIG. 9 of the first embodiment.

Here, the following comparative experiment 2 was performed in order to obtain knowledge regarding what kind of light utilization efficiency and color reproducibility would be obtained by configuring the color filter 129 as described above. In this comparative experiment 2, the liquid crystal panel 111 having the color filter 129 including the yellow coloring portion 129Y described before this paragraph, and the backlight device having the same LED as that of the first embodiment of the comparative experiment 1 of the first embodiment described above. A liquid crystal display device 110 having the above-described features is referred to as Example 2, and a liquid crystal display device using the same liquid crystal panel as that of Example 2 but having each phosphor provided in the LED of the backlight device changed as Comparative Example 3, and this Comparative Example Reference numeral 3 denotes a liquid crystal display device in which the color filter of the liquid crystal panel is changed as a comparative example 4. The liquid crystal display device 110 according to the second embodiment is the same as that described before this paragraph, and the yellow coloring portion 129Y constituting the color filter 129 has a peak rising position as shown in FIGS. The green phosphor provided in the LED has a transmission spectrum in which the wavelength at which the peak half value is about 506 nm, whereas the peak wavelength of the peak included in the emission spectrum is set to 533 nm and the half value width is about 470 nm. On the other hand, the red phosphor has a peak wavelength of the main peak included in the emission spectrum of 630 nm and a half width of about 8 nm, and the peak wavelength of the first sub peak is 613 nm. The peak wavelength of the two sub-peaks is 647 nm. The blue LED element provided in the LED according to Example 2 has a peak peak wavelength of 444 nm and a half width of about 20 nm. In the liquid crystal display device according to Comparative Example 3, the green phosphor included in the LED is, as shown in FIGS. 24 and 28, a first green phosphor made of β-SiAlON having an emission spectrum with a peak wavelength of 540 nm, A second green phosphor made of β-SiAlON having an emission spectrum with a peak wavelength of 522 nm, and a red phosphor having a emission spectrum with a peak wavelength of 650 nm. It is made of CaAlSiN ₃ : Eu which is a kind of the above. Further, the blue LED element included in the LED according to Comparative Example 3 has a peak peak wavelength of 444 nm and a half width of about 20 nm. Except for this LED, the other configurations of the liquid crystal display device according to Comparative Example 3 are the same as those of the liquid crystal display device 110 according to Example 2. As shown in FIGS. 26 and 28, the liquid crystal display device according to Comparative Example 4 includes the same LEDs as in Comparative Example 3, and the film thicknesses of the four colored portions constituting the color filter are the same as those in Example 2 and Specifically, the difference is 41% (the film thickness of each colored portion of the color filter of the liquid crystal display device according to Example 2 and Comparative Example 3 is set to 100%). Relative value). Except for this color filter, the other configurations of the liquid crystal display device according to Comparative Example 4 are the same as those of the liquid crystal display device according to Comparative Example 3. 24 shows the emission spectrum of the LED of Comparative Example 3 and the spectral transmittance of the color filter of Comparative Example 3. FIG. 26 shows the emission spectrum of the LED of Comparative Example 4 and Comparative Example 4. The spectral transmittance of the color filter. The horizontal and horizontal axes in FIGS. 24 and 26 are the same as those in FIG. In FIG. 26, the spectral transmittance of the color filters of Comparative Example 3 and Example 2 is shown as a thin line (a thin broken line with a short broken line, a thin broken line with a long broken line, a thin one-dot chain line and a thin two-dot chain line for reference. ).

  And in this comparative experiment 2, in each liquid crystal display device according to Example 2 and Comparative Examples 3 and 4 having the above-described configuration, the chromaticity of the LED, the luminance ratio of the emitted light from the liquid crystal panel, In addition to measuring each chromaticity, the NTSC ratio of the chromaticity region related to the emitted light, BT. 709 ratio, DCI ratio, and BT. The 2020 ratio is calculated, and the results are shown in FIG. 23, FIG. 25, and FIG. FIG. 23 shows the transmission spectrum of each color in the emitted light of the liquid crystal panel 111 of Example 2, and also shows the emission spectrum of the same LED as FIG. 22 for reference. FIG. 25 shows the transmission spectrum of each color in the emitted light of the liquid crystal panel of Comparative Example 3, and also shows the emission spectrum of the same LED as FIG. 24 for reference. FIG. 27 shows the transmission spectrum of each color in the light emitted from the liquid crystal panel of Comparative Example 4, and shows the emission spectrum of the same LED as FIG. 26 for reference. 23, 25 and 27, the horizontal axis and the horizontal axis are the same as those in FIG. 10 of the first embodiment. 29 and 30 show the chromaticity region according to each standard and the light emitted from the liquid crystal panel of the liquid crystal display device according to Example 2 and Comparative Examples 3 and 4 as in FIGS. 17 and 18 of the first embodiment. The chromaticity region of FIG. In the present embodiment, the luminance ratio of the light emitted from the liquid crystal panel is a relative value based on Comparative Example 3 (100%). The chromaticity of the light emitted from the liquid crystal panel is determined by displaying the white color on the liquid crystal panel, the red primary color on the liquid crystal panel, the yellow primary color, and the green primary color. In this state, the light transmitted through the color filter in the state where the primary color of blue is displayed is measured by a spectrocolorimeter or the like. The chromaticity area related to the light emitted from the liquid crystal panel is the chromaticity when the red primary color is displayed on the liquid crystal panel and the chromaticity when the yellow primary color is displayed on the liquid crystal panel (yellow chromaticity, yellow chromaticity). Primary color point), chromaticity when the green primary color is displayed, and chromaticity when the blue primary color is displayed, and each chromaticity is plotted in each chromaticity diagram. , A rectangular area with each chromaticity as a vertex. 29 is a CIE1931 chromaticity diagram as in FIG. 16, and FIG. 30 is a CIE1976 chromaticity diagram as in FIG. In FIGS. 29 and 30, each chromaticity according to the second embodiment is indicated by a round plot, and the chromaticity region according to the second embodiment is indicated by a thin broken line. Each chromaticity according to Comparative Example 3 is indicated by a rhombus plot, and the chromaticity region according to Comparative Example 3 is indicated by a solid line. Each chromaticity according to Comparative Example 4 is indicated by a triangular plot, and the chromaticity region according to Comparative Example 4 is indicated by a thick broken line. Regarding matters other than the above, the chromaticity of the chromaticity of the LED, the luminance ratio of the emitted light from the liquid crystal panel, and the measurement method of each chromaticity of the emitted light are as described in the first embodiment. Similarly, the NTSC ratio of the chromaticity region relating to the light emitted from the liquid crystal panel, BT. 709 ratio, DCI ratio, and BT. The calculation method of the 2020 ratio is also as described in the first embodiment.

  Then, the experimental result of the comparative experiment 2 is demonstrated. First, the NTSC ratio, BT. 709 ratio, DCI ratio, and BT. Regarding the 2020 ratio, as shown in FIG. 28 to FIG. 30, Comparative Example 3 has the lowest value, while Comparative Example 4 and Example 2 are both higher values than Comparative Example 3. In addition, the values are substantially equivalent to each other (specifically, the NTSC ratio, the BT.709 ratio, and the DCI ratio in the CIE 1931 chromaticity diagram are higher in the second embodiment). In particular, regarding the DCI ratio of the CIE1931 chromaticity diagram, Comparative Example 4 is “100%”, which is the same color reproduction range as the DCI chromaticity region according to the DCI standard, whereas Example 2 is “101%”. It can be said that it has a color reproduction range that exceeds the DCI chromaticity region according to the DCI standard (for details, see the column “DCI ratio: CIE1931 chromaticity diagram” in the second row from the top in FIG. 28). ). In Comparative Example 4, the thickness of each colored portion of the color filter is increased as compared with Comparative Example 2 and Example 4, so that more light that causes a decrease in color purity of each color is absorbed by each colored portion. This is considered to be because the color purity of the light transmitted through each colored portion was improved.

  On the other hand, in Example 2, although the film thicknesses of the colored portions 129R, 129G, 129B, and 129Y of the color filter 129 are the same as those in Comparative Example 3, the green phosphor and the red phosphor provided in the LED are different. Therefore, the color purity of light emitted from each of these phosphors is higher. Specifically, as shown in FIG. 22, the emission spectrum of the green phosphor of the LED according to Example 2 is almost entirely contained in the transmission spectrum of the green coloring portion 129G, but the transmission spectrum of the red coloring portion 129R Is smaller than those of Comparative Examples 3 and 4 (see FIGS. 24 and 26). The above overlapping range will be described in more detail. The intersection of the emission spectrum of the green phosphor of the LED according to Example 2 and the transmission spectrum of the red colored portion 129R is longer than that of the intersection according to Comparative Examples 3 and 4. It is a lower position (close to 0) in the axial direction. Thereby, although the green light with high color purity emitted from the green phosphor is efficiently transmitted through the green colored portion 129G, the green light is hardly transmitted through the red colored portion 129R and more efficiently by the red colored portion 129R. Therefore, the green chromaticity in the light emitted from the liquid crystal panel 111 becomes extremely high in color purity, and the green color gamut is expanded. Furthermore, although the emission spectrum of the red phosphor of the LED according to Example 2 is almost entirely included in the transmission spectrum of the red colored portion 129R, the overlapping range with the transmission spectrum of the green colored portion 129G is Comparative Example 3. , 4 (see FIG. 24 and FIG. 26) is smaller. The above overlapping range will be described in more detail. The intersection of the emission spectrum of the red phosphor of the LED according to Example 2 and the transmission spectrum of the green colored portion 129G is longer than the intersection of Comparative Examples 3 and 4. It is a lower position (close to 0) in the axial direction. As a result, red light with high color purity emitted from the red phosphor is efficiently transmitted through the red colored portion 129R, but hardly transmitted through the green colored portion 129G and more efficiently through the green colored portion 129G. Therefore, the red chromaticity in the light emitted from the liquid crystal panel 111 has extremely high color purity, and the red color gamut is expanded. Furthermore, each emission spectrum of the green phosphor and the red phosphor of the LED is almost entirely contained in the transmission spectrum of the yellow colored portion 129Y, so that the color purity emitted from the green phosphor and the red phosphor High green light and red light are efficiently transmitted through the yellow colored portion 129Y, so that the yellow chromaticity in the light emitted from the liquid crystal panel 111 has extremely high color purity, and the yellow color gamut is expanded. As described above, the light emitted from the liquid crystal panel 111 according to the second embodiment has high color reproducibility by extending the color gamuts of green, red, and yellow as shown in FIGS. Therefore, the chromaticity region is not less than Comparative Example 4, and 100% or more can be achieved in the DCI ratio of the CIE1931 chromaticity diagram. In this CIE1931 chromaticity diagram, since the green color gamut is expressed with a larger area than the red or blue color gamut, the green phosphor is shown in the transmission spectrum of the yellow colored portion 129Y as in Example 2. In addition, by including almost the entire region of each emission spectrum of the red phosphor and the yellow color gamut over the green color gamut and the red color gamut, the implementation according to the comparative experiment 1 of the first embodiment is performed. More than 100% can be achieved in the DCI ratio of the CIE1931 chromaticity diagram that could not be achieved in Example 1.

  On the other hand, as shown in FIG. 28, the brightness of the emitted light from the liquid crystal panel is reduced to “91%” in Comparative Example 4 as compared to “100%” in Comparative Example 3 as a reference, In Example 2, it is improved to “102%” (for details, see the column of “brightness ratio of emitted light” in the uppermost part of FIG. 28). In Comparative Example 4, the thickness of each colored portion of the color filter is increased by 41% compared to Comparative Example 3 and Example 2, which is even thicker than Comparative Example 2 described in Comparative Experiment 1 of Embodiment 1. Therefore, it is considered that when light passes through each colored portion, more light is absorbed and the light use efficiency is lowered, and as a result, the luminance of the emitted light from the liquid crystal panel is lowered. On the other hand, in Example 2, since the film thicknesses of the colored portions 129R, 129G, 129B, and 129Y of the color filter 129 are the same as those in the comparative example 3, light absorption by the colored portions 129R, 129G, 129B, and 129Y is performed. Although the amount is the same as that of Comparative Example 3, almost all the emission spectra of the green phosphor and red phosphor of the LED of Example 2 are respectively green colored portion 129G, red colored portion 129R, and yellow colored portion. 129Y is contained in each of the transmission spectra of the 129Y, so that the green light and red light from the LED pass through the green colored portion 129G, the red colored portion 129R, and the yellow colored portion 129Y with high efficiency, and thus the liquid crystal panel 111 It is considered that the brightness of the emitted light is improved. As described above, according to the liquid crystal display device 110 according to the second embodiment, the luminance of the emitted light is not impaired, but rather the luminance can be improved, and the color reproducibility is further improved. Can do.

  As described above, according to the present embodiment, the colored portions 129R, 129G, 129B, and 129Y constituting the color filter 129 include those that exhibit yellow. In this way, the chromaticity region relating to the emitted light of the liquid crystal panel 111 obtained by transmitting the light from the LED to the colored portions 129R, 129G, 129B, and 129Y of each color constituting the color filter 129 is green and yellow. Therefore, the color reproducibility of the image displayed on the liquid crystal panel 111 is further improved. In addition to the CIE1976 chromaticity diagram, the chromaticity region in the light emitted from the liquid crystal panel 111 is equal to or more than the DCI chromaticity region according to the DCI standard in the CIE1931 chromaticity diagram (100% or 100% in area ratio). Therefore, higher color reproducibility can be obtained.

  In addition, the yellow colored portion 129 </ b> Y exhibiting yellow in the color filter 129 has a transmission spectrum in which the peak rising position is in the range of 460 nm to 560 nm. In this way, the transmission spectrum of the yellow colored portion 129Y exhibiting yellow includes the peak of the emission spectrum of the green phosphor over the entire area, and the main peak, the first sub-peak, and the second of the emission spectrum of the red phosphor. Since the sub-peaks are included over the entire area, green light and red light with high color purity emitted from the LED efficiently pass through the yellow colored portion 129Y exhibiting yellow. As a result, the utilization efficiency relating to the green light and red light from the LED can be kept higher, and the yellow color gamut in the chromaticity region relating to the emitted light of the liquid crystal panel 111 becomes wider, and the color reproducibility is more excellent.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the backlight device 212 is changed from the first embodiment to a direct type. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 31, the liquid crystal display device 210 according to this embodiment has a configuration in which a liquid crystal panel 211 and a direct backlight device 212 are integrated by a bezel 213 or the like. Note that the configuration of the liquid crystal panel 211 is the same as that of the first embodiment, and a duplicate description thereof is omitted. Hereinafter, the configuration of the direct type backlight device 212 will be described.

  As shown in FIG. 32, the backlight device 212 is arranged so as to cover a substantially box-shaped chassis 214 having an opening on the light emission side (the liquid crystal panel 211 side), and the opening of the chassis 214. The optical member 215, and a frame 216 that is disposed along the outer edge portion of the chassis 214 and holds the outer edge portion of the optical member 215 with the chassis 214. Furthermore, in the chassis 214, an LED 217 arranged in an opposing manner at a position directly below the optical member 215 (the liquid crystal panel 211), and an LED substrate 218 on which the LED 217 is mounted are provided. In addition, the chassis 214 is provided with a reflection sheet 50 that reflects the light in the chassis 214 toward the optical member 215. Thus, since the backlight device 212 according to the present embodiment is a direct type, the light guide plate 19 used in the edge light type backlight device 12 shown in the first embodiment is not provided. The configuration of the frame 216 is the same as that of the first embodiment except that the frame-side reflection sheet 16R is not provided, and thus the description thereof is omitted. Next, each component of the backlight device 212 will be described in detail.

  The chassis 214 is made of metal, and as shown in FIGS. 32 to 34, a bottom plate 214a having a horizontally long shape like the liquid crystal panel 211, and a front side (light emitting side) from the outer end of each side of the bottom plate 214a. ) And a receiving plate 51 projecting outward from the rising end of each side plate 214b, and as a whole, has a shallow substantially box shape opened toward the front side. The chassis 214 has a long side direction that coincides with the X-axis direction (horizontal direction) and a short side direction that coincides with the Y-axis direction (vertical direction). On each receiving plate 51 in the chassis 214, a frame 216 and an optical member 215 described below can be placed from the front side. A frame 216 is screwed to each receiving plate 51.

  Next, the LED substrate 218 on which the LEDs 217 are mounted will be described. As shown in FIGS. 32 to 34, the LED substrate 218 has a base material that has a horizontally long rectangular shape (strip shape) in a plan view, the long side direction coincides with the X-axis direction, and the short side In the state where the direction coincides with the Y-axis direction, the chassis 214 is accommodated while extending along the bottom plate 214a. In the chassis 214, two LED boards 218 are arranged in parallel in a matrix (matrix), two in the X-axis direction (row direction) and nine in the Y-axis direction (column direction). Yes. The LED 217 is surface-mounted on the surface facing the front side (the surface facing the optical member 215 side) among the plate surfaces of the base material of the LED substrate 218, and this is the mounting surface 218a. The LED board 218 is held against the bottom plate 214a of the chassis 214 by a board holding member (not shown).

  As shown in FIG. 32, a plurality of LEDs 217 are intermittently arranged in a line along the long side direction (X-axis direction) on the mounting surface 218a of the LED substrate 218. Since a plurality of LEDs 217 are provided on each of the LED substrates 218 arranged in a matrix along the bottom plate 214a of the chassis 214 as described above, the X-axis direction in the chassis 214 as a whole A plurality are arranged in a matrix along the Y-axis direction. The LED 217 mounted on each LED substrate 218 has a light emitting surface 217 a facing the optical member 215 and the liquid crystal panel 211, and an optical axis thereof in the Z-axis direction, that is, a direction orthogonal to the display surface of the liquid crystal panel 211. Match.

  As shown in FIGS. 32 to 34, the reflection sheet 50 has a size that covers the entire inner surface of the chassis 214 over the entire area, that is, a size that covers all the LED substrates 218 arranged in a plane along the bottom plate 214a. doing. The reflection sheet 50 can reflect the light in the chassis 214 toward the optical member 215 side. The reflection sheet 50 extends along the bottom plate 214a of the chassis 214 and covers a large portion of the bottom plate 214a, and rises from the outer ends of the bottom portion 50a to the front side and is inclined with respect to the bottom portion 50a. It comprises four rising portions 50b formed and extending portions 50c that extend outward from the outer ends of the respective rising portions 50b and are placed on the receiving plate 51 of the chassis 214. The bottom portion 50a of the reflection sheet 50 is disposed so as to overlap the front side surface of each LED substrate 218, that is, the mounting surface 218a of the LED 217 on the front side.

  As described above, according to the present embodiment, the LED 217 has the light emitting surface 217 a that emits light, and the light emitting surface 217 a is arranged to face the plate surface of the liquid crystal panel 211. In this way, the light emitted from the light emitting surface 217a of the LED 217 is irradiated toward the plate surface of the liquid crystal panel 211 arranged to face the light emitting surface 217a. According to such a direct type backlight device 212, the light from the LED 217 is supplied to the liquid crystal panel 211 without passing through a member such as a light guide plate used in an edge light type. Excellent.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, a configuration in which the diffusion lens 52 is attached to the LED substrate 318 in the above-described third embodiment is shown. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIG. 35, the backlight device 312 provided in the liquid crystal display device 310 according to this embodiment includes a diffuser lens 52 attached to a position corresponding to the LED 317 on the LED substrate 318, and the LED substrate 318 with respect to the chassis 314. And a substrate holding member 53 for holding in the attached state.

  The diffusing lens 52 is made of a synthetic resin material (for example, polycarbonate or acrylic) that is substantially transparent (having high translucency) and has a refractive index higher than that of air. As shown in FIGS. 36 to 38, the diffusing lens 52 has a predetermined thickness and is formed in a substantially circular shape when viewed from above, and each LED 317 is arranged on the front side (light emitting side) with respect to the LED substrate 318. Are individually attached so as to be overlapped with each LED 317 in a plan view. The diffusion lens 52 can emit light having a strong directivity emitted from the LED 317 while diffusing it. That is, the directivity of the light emitted from the LED 317 is relaxed through the diffusing lens 52, so that even if the space between the adjacent LEDs 317 is wide, the region between them is difficult to be visually recognized as a dark part. Thereby, it is possible to reduce the number of installed LEDs 317 while suppressing the occurrence of uneven brightness. The diffusing lens 52 is disposed at a position that is substantially concentric with the LED 317 when viewed in plan.

  The substrate holding member 53 is made of a synthetic resin such as polycarbonate, and has a white surface with excellent light reflectivity. As shown in FIGS. 37 and 38, the substrate holding member 53 protrudes toward the back side, that is, the bottom plate 314a side of the chassis 314 from the main body portion along the plate surface of the LED substrate 318, and is fixed to the bottom plate 314a. And a fixing part. A plurality of substrate holding members 53 are attached to each LED substrate 318, and the arrangement thereof is adjacent to the LEDs 317 in the X-axis direction. The plurality of substrate holding members 53 include one having a support portion 53a that protrudes from the main body portion to the front side and supports the optical member 315 from the back side. In the reflection sheet 350, holes through which the respective diffusion lenses 52 pass and holes through which the respective substrate holding members 53 pass are formed at corresponding positions.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each of the embodiments described above, the green phosphor provided in the LED is exemplified as having a light emission spectrum including a peak having a peak wavelength of 533 nm and a half width of about 53 nm. In addition, it is also possible to use a green phosphor having an emission spectrum that is slightly different from the specific value of the peak wavelength at the peak and the specific value of the half width of the peak. That is, the specific numerical values of the peak wavelength and peak half-value width in the above-mentioned peak are the requirements of the emission spectrum of the green phosphor (including the peak having a peak wavelength in the range of 520 nm to 540 nm and the half-value width of less than 60 nm Can be appropriately changed within a range satisfying the emission spectrum).

  (2) In each of the above-described embodiments, as the red phosphor provided in the LED, the first sub-peak includes a main peak with a peak wavelength of 630 nm, a half width of about 8 nm, and a peak wavelength of 613 nm. And a second sub-peak having a peak wavelength of 647 nm, but a specific numerical value of the peak wavelength at the main peak and a specific numerical value of the half-width of the main peak. It is also possible to use a red phosphor having an emission spectrum that is slightly different from the specific value of the peak wavelength in the first subpeak and the specific value of the peak wavelength in the second subpeak. That is, the specific numerical values of the peak wavelength in the main peak, the half width of the main peak, the peak wavelength in the first sub peak, and the peak wavelength in the second sub peak are the requirements of the emission spectrum of the red phosphor (the peak wavelength is 629 nm). A second peak including a main peak in a range of ˜635 nm and a half width of less than 10 nm, and further including a first sub-peak in which a peak wavelength is in a range of 607 nm to 614 nm and a peak wavelength in a range of 645 nm to 648 nm. The emission spectrum including sub-peaks can be appropriately changed within a range that satisfies the condition.

  (3) In each of the above-described embodiments, the case where europium-activated β-SiAlON, which is an oxynitride phosphor and a kind of sialon phosphor, is used as the green phosphor provided in the LED. It is also possible to use β-SiAlON using an activator other than europium (for example, rare earth elements such as Tb, Y, Ce, and Ag). Furthermore, as long as it satisfies the requirements of the emission spectrum of the green phosphor (emission spectrum including a peak having a peak wavelength in the range of 520 nm to 540 nm and a half width of less than 60 nm), a sialon other than β-SiAlON. It is also possible to use a system phosphor. In addition, an oxynitride phosphor other than a sialon phosphor can be used as long as the emission spectrum requirement of the green phosphor is satisfied. In addition, if the emission spectrum requirement of the green phosphor is satisfied, a phosphor other than the oxynitride phosphor (for example, a BOSE phosphor or a YAG phosphor which is a kind of oxide phosphor) is used. Is also possible.

(4) In each of the above embodiments, the case where manganese-activated potassium silicofluoride (K ₂ TiF ₆ ), which is a kind of double fluoride phosphor, is used as the red phosphor provided in the LED, It is also possible to use potassium silicofluoride using an activator other than manganese. Further, there is a requirement for the emission spectrum of the red phosphor (including a main peak having a peak wavelength in the range of 629 nm to 635 nm, a half width of less than 10 nm, and a peak wavelength in the range of 607 nm to 614 nm. It is also possible to use a double fluoride phosphor other than potassium silicofluoride as long as the emission spectrum includes the second sub-peak including the sub-peak and the peak wavelength in the range of 645 nm to 648 nm. In addition, it is possible to use a phosphor other than the double fluoride phosphor as long as the requirement of the emission spectrum of the red phosphor is satisfied.

  (5) As a specific example of “a double fluoride phosphor other than potassium silicofluoride” described in (4) above, for example, instead of silicon (Si) of potassium silicofluoride, titanium (Ti), zirconium (Zr) And a double fluoride phosphor having a structure using any one of hafnium (Hf), germanium (Ge), and tin (Sn). In addition, in place of potassium (K) of potassium silicofluoride, a double fluoride phosphor using any of lithium (Li), sodium (Na), rubidium (Rb), and cesium (Cs) is given. be able to. Furthermore, it can replace with the silicon of potassium silicofluoride, and the double fluoride fluorescent substance which selected and used from silicon, titanium, zirconium, hafnium, germanium, and tin can be mentioned.

  (6) In each of the above-described embodiments, as the red phosphor provided in the LED, the first sub-peak on the short wavelength side is relatively higher than the main peak, whereas the long wavelength side is higher than the main peak. Although the case where an emission spectrum having a relatively low second subpeak is used is shown, it is also possible to use a red phosphor having an emission spectrum in which the height relationship between the first subpeak and the second subpeak is reversed. It is.

  (7) In each of the above-described embodiments, the case where only one type of green phosphor provided in the LED is used has been described. However, a plurality of types of green phosphors can be used in combination. In that case, it is preferable that the plurality of types of green phosphors have an emission spectrum including peaks having different peak wavelengths and an emission spectrum including peaks having different half-value widths.

  (8) In each of the above-described embodiments, the case where only one type of red phosphor provided in the LED is used is shown, but a plurality of types of red phosphors may be used in combination. In that case, the plurality of types of red phosphors include an emission spectrum including a main peak having a different peak wavelength, an emission spectrum including a first subpeak having a different peak wavelength, an emission spectrum including a second subpeak having a different peak wavelength, A configuration having an emission spectrum including main peaks having different half-value widths is preferable.

  (9) In each of the above-described embodiments, the LED has a configuration including a green phosphor and a red phosphor. However, in addition to the green phosphor and the red phosphor, a yellow phosphor that emits yellow light is provided. The present invention is also applicable to LEDs. As an example of the yellow phosphor, for example, α-SiAlON, which is a kind of sialon phosphor, can be used.

  (10) In each of the embodiments described above, the blue LED element provided in the LED is exemplified as having a light emission spectrum including a peak having a peak wavelength of 444 nm and a half width of about 20 nm. In addition, it is also possible to use a blue LED element having an emission spectrum that is slightly different from the specific value of the peak wavelength at the peak and the specific value of the half width of the peak. That is, the specific numerical values of the peak wavelength and the half width of the peak at the peak described above are appropriately within a range that satisfies the requirements of the emission spectrum of the blue LED element (emission spectrum including a peak having a peak wavelength in the range of 430 nm to 460 nm). Can be changed.

  (11) In each of the above-described embodiments, the case where InGaN is used as the material of the LED element constituting the LED is shown. However, as other LED element materials, for example, GaN, AlGaN, GaP, ZnSe, ZnO, AlGaInP, etc. It is also possible to use.

  (12) In each of the above-described embodiments, the case where a top-emitting LED is used has been exemplified. However, a side-emitting LED in which a side surface adjacent to the mounting surface of the LED substrate is a light-emitting surface may be used. Is possible.

  (13) In addition to the embodiments described above, the mechanical structure of the LED (such as the shape of the case and the shape of the lead frame) can be changed as appropriate.

  (14) In each of the above-described embodiments, the green colored portion provided in the color filter is exemplified as having a transmission spectrum that includes a peak with a peak wavelength of 530 nm and a half width of about 92 nm. In addition, it is also possible to use a green colored portion having a transmission spectrum in which the specific value of the peak wavelength at the peak and the specific value of the half width of the peak are slightly different. That is, the specific numerical values of the peak wavelength and the peak half-value width in the above-described peak are the requirements of the transmission spectrum of the green colored portion (including the peak having a peak wavelength in the range of 510 nm to 550 nm and the half-width is less than 110 nm. Can be appropriately changed within a range satisfying the transmission spectrum).

  (15) In each of the above-described embodiments, the red colored portion provided in the color filter is exemplified by the one having a transmission spectrum in which the peak rising position is about 566 nm and the half-peak wavelength is about 588 nm. In addition to this, it is also possible to use a red colored portion having an emission spectrum with slightly different specific numerical values of the rising position at the peak and the half value of the peak. In other words, the specific numerical values of the rising position at the peak and the half-peak wavelength are the requirements of the transmission spectrum of the red colored portion (the peak rising position is 560 nm or more, or the half-peak wavelength is 580 nm or more. Can be appropriately changed within a range satisfying the transmission spectrum).

  (16) In each of the above embodiments, the blue colored portion provided in the color filter is exemplified as having a transmission spectrum including a peak having a peak wavelength of 455 nm and a half-value width of approximately 105 nm. In addition, it is also possible to use a blue colored portion having a transmission spectrum in which the specific value of the peak wavelength at the peak and the specific value of the half width of the peak are somewhat different. That is, the specific numerical values of the peak wavelength and peak half-value width in the above-described peak are the requirements of the transmission spectrum of the blue colored portion (including the peak having a peak wavelength in the range of 440 nm to 480 nm and the half-value width is less than 110 nm. Can be appropriately changed within a range satisfying the transmission spectrum).

  (17) In Embodiment 2 described above, the yellow colored portion provided in the color filter is exemplified as having a transmission spectrum in which the peak rising position is about 470 nm and the half-peak wavelength is about 506 nm. In addition to this, it is also possible to use a yellow colored portion having an emission spectrum with slightly different specific numerical values of the rising position at the peak and the half value of the peak. That is, the specific numerical values of the rising position at the peak and the half-peak wavelength are the requirements of the transmission spectrum of the yellow colored portion (the peak rising position is in the range of 460 nm to 560 nm, or the half-peak wavelength is The transmission spectrum can be appropriately changed within a range satisfying a transmission spectrum of 480 nm to 580 nm.

  (18) In Embodiment 2 described above, the case where the area ratio of the blue colored portion and the red colored portion to the yellow colored portion and the green colored portion is 1.6 is exemplified, but each area of the blue colored portion and the red colored portion Is kept larger than the respective areas of the yellow colored portion and the green colored portion, and the specific numerical value of the area ratio can be appropriately changed.

  (19) In Embodiment 2 described above, the blue colored portion and the red colored portion constituting the color filter are different from the green colored portion and the yellow colored portion, but the blue colored portion and the red colored portion are different. It is also possible to make the area ratios of the green colored portion and the yellow colored portion equal. It is also possible to set the area ratio of the blue colored portion and the red colored portion to be different from each other. Similarly, the area ratio of the green colored portion and the yellow colored portion can be set to be different from each other. Moreover, in each embodiment, it can change suitably about the arrangement | sequence order, area ratio, etc. of each coloring part which comprises a color filter.

  (20) In Embodiment 2 described above, a color filter having a configuration in which a yellow coloring portion is added to a red coloring portion, a green coloring portion, and a blue coloring portion is exemplified, but instead of the yellow coloring portion, for example, cyan light is used. It is also possible to use a cyan colored portion that transmits selectively. It is also possible to add a colored portion exhibiting a color other than cyan in place of the yellow colored portion. Furthermore, it is also possible to add a non-colored part having no wavelength selectivity in place of the yellow colored part.

  (21) In each of the embodiments described above, the color filter of the color filter included in the liquid crystal panel is exemplified by three or four colors. However, the color part may be five or more colors.

  (22) In each of the above-described embodiments, it is possible to produce each color by including a predetermined pigment or dye in each colored portion constituting the color filter.

  (23) In the first embodiment described above, in the edge light type backlight device, the LED substrates (LEDs) are arranged in pairs at the end portions on both long sides of the chassis (light guide plate). The present invention includes a pair of LED substrates (LEDs) arranged at the ends of both short sides of the chassis (light guide plate).

  (24) In addition to the above (23), a pair of LED substrates (LEDs) arranged on both ends of the long side and the short side of the chassis (light guide plate), or conversely, LED substrates ( The present invention also includes a single LED disposed only on one long side or one short side end of the chassis (light guide plate).

  (25) Of course, the configuration described in the third and fourth embodiments can be combined with the configuration described in the second embodiment.

  (26) In the direct type backlight device described in the third embodiment, the number and arrangement pitch of LEDs on the LED substrate, the number of LED substrates on the chassis, the size of the LED substrate, and the like can be changed as appropriate. is there.

  (27) In the fourth embodiment described above, in the direct backlight device, the diffuser lens is individually attached to all LEDs, but the diffuser lens is attached only to some LEDs. It doesn't matter. Further, the number and arrangement pitch of LEDs on the LED substrate, the number of LED substrates on the chassis, the size of the LED substrate, and the like can be appropriately changed.

  (28) In each of the embodiments described above, an LED is used as the light source, but other light sources such as an organic EL can be used.

  (29) In each of the above-described embodiments, the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction. However, the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.

  (30) In each of the above-described embodiments, the TFT is used as the switching element of the liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.

  (31) In each of the above-described embodiments, the liquid crystal display device using a liquid crystal panel as the display panel has been exemplified. However, the present invention can be applied to a display device using another type of display panel.

  (32) In each of the above-described embodiments, the television receiver provided with the tuner has been exemplified. However, the present invention can also be applied to a display device that does not include the tuner. Specifically, the present invention can also be applied to a liquid crystal display device used as an electronic signboard (digital signage) or an electronic blackboard.

  10, 110, 210, 310 ... Liquid crystal display device (display device), 10T, 110T ... Tuner (receiver), 10TV, 110TV ... TV receiver, 11, 111, 211 ... Liquid crystal panel (display panel), 12, 212 312 ... Backlight device (illumination device) 17, 217, 317 ... LED (light source), 17a, 217a ... Light emitting surface, 19 ... Light guide plate, 19a ... Light exit surface, 19b ... Light incident surface, 29, 129 ... Color filters, 29B, 129B ... blue colored part (colored part exhibiting blue), 29G, 129G ... green colored part (colored part exhibiting green), 29R, 129R ... red colored part (colored part exhibiting red), 40 ... Blue LED element (blue light emitting element), 129Y ... Yellow colored part (colored part exhibiting yellow)

The present invention relates to a lighting device, a display device, and a television receiver.

The chromaticity of the LED can be measured by, for example, a spectrocolorimeter or the like for light emitted from the LED. The luminance ratio of the light emitted from the liquid crystal panel was measured for each of the liquid crystal display devices according to Example 1 and Comparative Examples 1 and 2 in a state where the liquid crystal panel was displayed in white so as to have the highest luminance. These are relative values based on the luminance value in Comparative Example 1 as a reference (100%). The chromaticity of the light emitted from the liquid crystal panel is determined by displaying the white color on the liquid crystal panel, displaying the red primary color on the liquid crystal panel, displaying the green primary color, and displaying the blue primary color. In this state, the light transmitted through the color filter is measured by a spectrocolorimeter or the like. NTSC ratio in the chromaticity region relating to the light emitted from the liquid crystal panel, BT. 709 ratio, DCI ratio, and BT. The 2020 ratio is an area ratio with respect to each standard of the chromaticity region related to the emitted light of the liquid crystal panel in the liquid crystal display devices according to the first embodiment and the comparative examples 1 and 2. The chromaticity area related to the light emitted from the liquid crystal panel is the chromaticity when the primary color of red is displayed on the liquid crystal panel (the chromaticity of red and the primary color of red) and the chromaticity when the primary color of green is displayed. (Green chromaticity, green primary color point) and chromaticity when blue primary color is displayed (blue chromaticity, blue primary color point) are measured respectively, and each chromaticity is shown in each chromaticity diagram. This is a triangular area with each chromaticity as a vertex that appears when plotted in.

Claims (15)

A blue light-emitting element that emits blue light, and a green phosphor that emits green light when excited by the blue light from the blue light-emitting element, including a peak whose peak wavelength is in the range of 520 nm to 540 nm, and a half thereof A green phosphor having an emission spectrum having a value width of less than 60 nm and a red phosphor emitting red light when excited by blue light from the blue light emitting element, and having a peak wavelength in the range of 629 nm to 635 nm. The red color of the emission spectrum including the peak, the half width of which is less than 10 nm, and further including the first sub-peak in which the peak wavelength is in the range of 607 nm to 614 nm and the second sub-peak in which the peak wavelength is in the range of 645 nm to 648 nm A lighting device comprising a light source having a phosphor;
A display panel having a color filter composed of a plurality of colored portions exhibiting at least blue, green, and red, and performing display using light from the illumination device;
A display device comprising:   The display device according to claim 1, wherein the green phosphor contains an oxynitride phosphor.   The display device according to claim 2, wherein the oxynitride phosphor is made of a sialon phosphor.   The display device according to claim 3, wherein the sialon phosphor is β-SiAlON using europium as an activator.   The display device according to claim 1, wherein the red phosphor contains a double fluoride phosphor.   The display device according to claim 5, wherein the double fluoride phosphor is potassium silicofluoride using manganese as an activator.   The colored portion exhibiting green color in the color filter has a transmission spectrum including a peak having a peak wavelength in a range of 510 nm to 550 nm and a half width of less than 110 nm. The display device according to any one of the above.   The display device according to any one of claims 1 to 7, wherein the colored portion exhibiting red color in the color filter has a transmission spectrum having a peak rising position of 560 nm or more.   The display device according to any one of claims 1 to 8, wherein the blue light emitting element has an emission spectrum including a peak having a peak wavelength in a range of 430 nm to 460 nm.   The display device according to claim 9, wherein the colored portion exhibiting blue color in the color filter has a transmission spectrum including a peak having a peak wavelength in a range of 440 nm to 480 nm and a half width of less than 110 nm. .   The display device according to any one of claims 1 to 10, wherein the colored portion constituting the color filter includes a yellow color.   The display device according to claim 11, wherein the colored portion exhibiting yellow in the color filter has a transmission spectrum in which a peak rising position is in a range of 460 nm to 560 nm.   The light source according to any one of claims 1 to 12, wherein the light source has a light emitting surface that emits light, and the light emitting surface is arranged to face the plate surface of the display panel. Display device.   The illumination device is arranged in a shape facing the light source, and has a light incident surface on which light from the light source is incident on an end surface, and is arranged in a shape opposed to the plate surface of the display panel. The display device according to any one of claims 1 to 12, further comprising a light guide plate having a light emitting surface for emitting light toward the display panel on a plate surface.   A television receiver comprising: the display device according to any one of claims 1 to 14; and a receiving unit capable of receiving a television signal.

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