JP2012155999A - Lighting system and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an lighting system of high color reproduction properties with a member structure for converting color tones of emission light of a backlight, by restraining material cost for light control as much as possible.SOLUTION: In the lighting system provided with: a light source 12; a light guide plate 8 guiding light emitted from the light source to emit toward a light control member; a reflecting sheet 9 fitted to a face contrary to one emitting light of the light guide plate; and a light control member 31 for controlling emission light emitted from the light guide plate, the light control member 31 includes: a recurring function of refracting or reflecting part of incident light to recur it to an opposite direction R to a light emission direction F of the lighting system; and a light control function carrying out absorption of light of a specific wavelength or wavelength conversion.

Description

  The present invention relates to an illuminating device and an image display device, and more particularly to an illuminating device and an image display device that improve the color rendering characteristics of the illuminating device and further the color reproducibility of the image display device.

  In recent years, an image display device (for example, a display device or a television device) that displays an image using a display module such as a liquid crystal panel has rapidly spread.

  When a liquid crystal panel is used for the display module, a backlight is required. For example, a linear light source such as a cold cathode tube (CCFL) is used as a light source of the backlight, and a light emitting diode (LED) is used. A point-like light source may be used.

  In order to convert this linear light source or point light source into planar light to be used as a backlight or lighting device, for example, a direct light system in which a light source is disposed immediately below the back surface in the light emission direction, or a light source on a side surface. A typical optical structure is an edge light system in which a surface light source is formed by guiding a light in a planar shape using a light guide plate.

  In recent years, with the increase in the size of the screen, there has been a demand for thickness reduction and weight reduction that makes the image display device main body as thin as possible. In order to reduce the thickness and weight of the main body of the image display device, it is necessary to reduce the thickness and weight of the display module or the housing that occupies most of the capacity and weight of the main body of the image display device. In order to reduce the thickness of the display module, it is necessary to reduce the thickness of the backlight.

  In order to reduce the thickness of the backlight, various edge light type backlight systems have been proposed so far. In the edge light system, an increase in the thickness of the backlight can be suppressed by arranging the light source on the end face of the light guide plate.

  By the way, about the light source used for a backlight or an illuminating device, the emission spectrum from the phosphor of CCFL or LED that generates white light is in the vicinity of the middle of each wavelength of RGB (for example, yellow) in addition to the wavelength bands corresponding to the three primary colors of RGB. When the intensity of the emission spectrum is large, the color reproduction performance of the image display device is deteriorated.

  As a method that does not deteriorate the color reproduction performance, there is a method of improving the phosphor material of the white light source. Specifically, for example, a phosphor that is combined with a blue light emitting element in a white light source LED is changed from YAG (yellow) to RG (red green).

  Alternatively, when it is not desired to change the light source, RGB is used by using a filter that absorbs light having a wavelength located in the middle of each RGB color or a color conversion material that converts light having a wavelength to be attenuated into a wavelength band of each RGB color. There is a method for preventing deterioration in color reproduction performance by increasing the spectral components of the three primary colors.

  For example, as in Patent Document 1, an edge light type backlight system has been proposed in which a color layer containing a pigment is provided on the surface of a diffusion plate to convert the color tone of backlight emission light.

JP 2003-279985 A

  However, the device of Patent Document 1 is a light diffusing member that is colored using a pigment, and the light diffusing member has a function of diffusing emitted light. Therefore, a large amount of emitted light hits the pigment only once before the light generated from the light source exits the apparatus, and does not greatly affect the color tone characteristic emitted by the lighting apparatus, and only a slight effect appears in the characteristic.

  If a lighting device is produced so as to obtain an optimum color tone, the content ratio of the pigment must be significantly increased, or the colored layer must be applied to be significantly thicker. Therefore, the apparatus of Patent Document 1 has a problem that the material cost is increased or the amount of pigment increases, so that production management becomes complicated and production efficiency is lowered.

  Therefore, the present invention provides an illumination device and an image display device that have high color reproducibility by a member configuration that converts the color tone of light emitted from a backlight while minimizing the material cost for light control.

  The first invention includes a light source (12), a light guide plate (8) for guiding the light emitted from the light source (12) and emitting the light to a light control member (31), and the light from the light guide plate (8). A reflection sheet (9) provided on a surface (8c) opposite to the surface (8b) to be emitted, and a light control member (31) for controlling the emitted light emitted from the light guide plate (8). In the illuminating device provided, the light control member (31) has a recursive function that refracts or reflects a part of incident light to recurse in a direction (R) opposite to the light emission direction (F) of the illuminating device, It has a light control function that performs light absorption or wavelength conversion of a specific wavelength.

  The second invention is a light source (12), a light guide plate (8) for guiding light emitted from the light source (12) and emitting it to a light control member (31), and light from the light guide plate (8). A reflection sheet (9) provided on the surface (8c) opposite to the surface (8b) to be emitted, a light control member (31) for controlling the emitted light H1 emitted from the light guide plate (8), In the illuminating device, the light control member (31) has a recursive function in which a part of incident light is refracted or reflected to recurse in a direction (R) opposite to the light emitting direction (F) of the illuminating device. The light emitting surface is provided with a fine shape (34, 35), and a light adjusting function for light absorption or wavelength conversion at a specific wavelength is provided as a light adjusting layer (20) including a pigment on the light incident surface.

  According to a third aspect of the present invention, in the first or second aspect, the light control member (31) is composed of a plurality of pieces, and is one piece (most opposite to the light emission direction F in the illumination device) ( 6c, 20) includes the recursive function and the dimming function.

  In a fourth aspect based on the second aspect, the fine shape is formed by arranging a plurality of microlenses (34) on the surface of the diffusion sheet (31).

  In a fifth aspect based on the second aspect, the fine shape is formed as a prism (35) by forming a plurality of V-shaped irregularities on the surface of the diffusion sheet (31).

  A sixth invention is a display having a backlight (6, 7, 8, 9, 12) by the lighting device described in any one of the first to fifth and a display surface (4a) for displaying an image. An image display device comprising a module (4).

  According to the present invention, the material cost for light control is suppressed as much as possible, and even if the content ratio of the pigment is greatly reduced or the colored layer is applied to be extremely thin, the color tone of the emitted light from the backlight is greatly changed. Thus, it is possible to prevent the color reproduction performance from being deteriorated.

FIG. 1 is a cross-sectional view for explaining the ray trajectory of the illumination device of the present invention. FIG. 2 is a cross-sectional view for explaining the ray trajectory of the illumination device of the comparative example for the present invention. 3A and 3B show a light control member in the illumination device of the present invention, in which FIG. 3A is a plan view thereof, and FIG. 3B is a diagram showing a ray trajectory in the section AA in FIG. 4A and 4B show a light control member in a lighting device of a comparative example for the present invention, in which FIG. 4A is a perspective view thereof, and FIG. FIG. 5 is a diagram showing the transmittance distribution of the light control layer of the present invention. 6A and 6B are distribution diagrams showing the emission spectra of the light source and the illumination device of the present invention, FIG. 6A shows the emission spectrum distribution of the light source, and FIG. 6B shows the emission spectrum distribution of the illumination device. FIG. 7 is a diagram showing the improvement in color reproduction performance of the present invention. FIG. 8 shows one of the light control members in the illumination device of the present invention, (A) is a perspective view thereof, and (B) is a sectional view taken along the line CC of (A). FIG. 9 is a cross-sectional view showing another embodiment of the illumination device of the present invention. FIG. 10 is a sectional view showing the structure of the image display device of the present invention. FIG. 11 is a perspective view for explaining the LED board mounting structure of the present invention. FIG. 12 is an exploded view for explaining the image display apparatus of the present invention. FIG. 13 is a perspective view for showing the entire configuration of the image display apparatus of the present invention. 14A and 14B show another light control member in the illumination device of the present invention, in which FIG. 14A is a perspective view thereof, and FIG. 14B is a cross-sectional view taken along the line DD of FIG.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view for explaining the ray trajectory of the illumination device of the present invention. The configuration of the illumination device (backlight) includes an LED light source 12, which is a light source, a reflection sheet 9, a light guide plate 8, a light control layer 20, and a diffusion sheet 6c. The LED light source 12 is a light guide plate. 8, and is covered with the reflector 30.

  1 is an edge that guides light emitted from an LED light source 12 disposed on one side surface 8a of a light guide plate 8 into a planar shape and emits the light to a light control member 31 including a light control layer 20 and a diffusion sheet 6c. It is a light system. One side surface 8a of the light guide plate 8 is a light incident surface on which light emitted from the LED light source 12 is incident.

  The upper side of the diffusion sheet 6c in FIG. 1 is a liquid crystal display panel (not shown) side, and the light emitted from the light emitting surface 8b of the light guide plate 8 is displayed on the liquid crystal display 20 as incident light H1 on the liquid crystal display. Proceed as shown by the arrow to the panel side. Light incident from the light guide plate 8 (incident light H1) is subjected to light absorption or wavelength conversion at a specific wavelength in the light control layer 20.

  Thereafter, the light incident from the light guide plate 8 is refracted by the diffusion sheet 6c, and a part of the refracted light becomes the recursive light H2 in the direction R opposite to the light emission direction F of the lighting device, and again the light control layer. At 20, light absorption or wavelength conversion of a specific wavelength is performed.

Further, the light that enters the light guide plate 8 is reflected by the reflection sheet 9 provided on the surface 8c opposite to the surface 8b from which the light of the light guide plate 8 is emitted, and the light guide plate 8 includes the light of the lighting device. Reflected light H3 is emitted in the light emission direction F, and light absorption or wavelength conversion of a specific wavelength is performed again in the light control layer 20. In FIG. 1, circled numbers 1, 2, and 3 indicate the order in which light absorption or wavelength conversion of a specific wavelength is performed in the light control layer 20.
In the illuminating device of this embodiment, through the above-described steps, the light is finally emitted from the diffusion sheet 6c toward the liquid crystal display panel as emitted light H4. Thereby, the spectral components of the three primary colors of RGB are increased more than before, and the color reproduction performance is improved. Many of the ray trajectories from the incident light H1 to the emitted light H4 pass through the light control layer 20 three times, greatly affecting the color tone characteristics emitted by the lighting device, and appear as effective characteristics. In this embodiment, the number of times of passing through the light control layer 20 is three, but the number of times is an example, and is not limited to this number.

  As described above, the light control member 31 in the illumination device according to the present embodiment has a recursive function that recurs or reflects a part of the incident light in a direction R opposite to the light emission direction F of the illumination device, and a specific wavelength. A light control function for performing light absorption or wavelength conversion is provided.

  FIG. 2 is a cross-sectional view for explaining the ray trajectory of the illumination device of the comparative example for the present invention. The configuration of the illumination device (backlight) includes the LED light source 12, the reflection sheet 9, the light guide plate 8, the diffusion plate 32, and the coloring layer 33, and the LED light source 12 is one side surface 8 a of the light guide plate 8. It is set as the structure covered with the reflector 30.

  2 is an edge light that guides light emitted from the LED light source 12 disposed on one side surface 8a of the light guide plate 8 to a light control member 31 including a diffusion plate 32 and a colored layer 33. It is a method. The colored layer 33 is provided on the surface of the diffusion plate 32 opposite to the light guide plate 8.

  In the illuminating device of FIG. 2, light (incident light H1) incident from the light guide plate 8 is diffused by the diffusion plate 32, and then light absorption or wavelength conversion at a specific wavelength is performed by the colored layer 33, so that the emitted light is emitted. H4 is emitted toward the liquid crystal display panel. However, in this illuminating device, the number of times that most of the ray trajectories from the incident light H1 to the emitted light H4 pass through the colored layer 33 is set to one time. For this reason, in this lighting device, only a small effect is exerted on the color tone characteristic emitted by the lighting device, and only a slight effect appears in the characteristic.

  3A and 3B show a light control member in the illumination device of the present invention, in which FIG. 3A is a plan view thereof, and FIG. 3B is a diagram showing a ray trajectory in the section AA in FIG. In the present embodiment, an optical sheet 6c with a microlens having a structure shown in FIG. 3 is used as a diffusion sheet. The optical sheet 6c with microlenses has a fine shape having a recursive function by two-dimensionally arranging a large number of microlenses 34 on the light emission surface of the sheet-like base material 6c1. The shape of the micro lens 34 is, for example, a substantially hemispherical or substantially semi-ellipsoidal protrusion. Since both the sheet-like base material 6c1 and the microlens 34 need to transmit incident light, they are made of a colorless and transparent material.

  The microlenses 34 are densely arranged so as to be adjacent over the entire surface of the sheet-like base material 6c1. In order to make the best use of the condensing effect of the microlenses 34, it is desirable to arrange the microlenses 34 on the sheet-like substrate 6c1 without any gaps. Further, as shown in FIG. 3, it is desirable to arrange each microlens 34 so that the diameters of the surfaces of the microlenses 34 in contact with the base material 6c1 when viewed from the light emission side are randomly changed. By randomly changing the optical sheet 6c with microlenses and other optical members, the occurrence of moire can be reduced.

  The microlens-equipped optical sheet 6c has an optical function such as excellent light collection and refraction in the normal direction by the plurality of microlenses 34 on the surface.

  Looking at the AA line cross section of FIG. 3B, the incident light H1 first passes through the light control layer 20, and then enters the optical sheet 6c with a microlens, and then the microlens. After the light is refracted by the microlenses 34 arranged on the surface of the base 6c1 of the attached optical sheet 6c, the light becomes the recursive light H2 in the direction R opposite to the light incident direction F, and again enters the light control layer 20 for the second time. (The arrow in the figure is the ray trajectory).

  4A and 4B show a light control member in a lighting device of a comparative example for the present invention, in which FIG. 4A is a perspective view thereof, and FIG. The conventional general diffusing plate 32 is formed into a flat plate shape by adding light diffusing particles 36 having light diffusing properties to a light transmitting resin as a base material.

  4B, the incident light H1 passes through the colored layer 33 once after being diffused by the light diffusion particles 36 in the diffusion plate (in the drawing). Multi-directional spread of arrows).

  FIG. 5 is a diagram showing the transmittance distribution of the light control layer of the present invention. The light control layer 20 of the present embodiment is obtained by applying a resin containing a pigment that absorbs or converts wavelength of a specific wavelength to the optical sheet 6c with a microlens, and the light spectrum of the specific wavelength in the visible light region. It has a function of selectively absorbing or wavelength converting.

  In the present embodiment, as shown in the distribution diagram of FIG. 5, the first minimum transmittance is set around the wavelength of 500 nm indicating the boundary point between the blue spectrum and the green spectrum, and the first absorption is performed. A function having a peak wavelength position and a function having a second absorption peak wavelength position by setting a second minimum transmittance around a wavelength of 600 nm indicating a boundary point between a green spectrum and a red spectrum. ing. Furthermore, the wavelength loss of the light spectrum component absorbed at the first and second absorption peak wavelength positions is converted into the red band, thereby increasing the gain of the red spectrum and the spectral loss of the light control layer 20 of the present embodiment. Is kept to a minimum.

  6A and 6B are distribution diagrams showing the emission spectra of the light source and the illumination device of the present invention, FIG. 6A shows the emission spectrum distribution of the light source, and FIG. 6B shows the emission spectrum distribution of the illumination device. A distribution A indicates an emission spectrum of the light source 12 in the present embodiment, and a distribution B indicates an emission spectrum of the illumination device in the present embodiment.

  The white LED of the light source 12 used in the present embodiment has a structure in which a mold member containing a YAG phosphor is applied to a blue light emitting element made of a gallium nitride compound semiconductor in a package. This white LED uses a part of the main wavelength of the blue light emitting element to cause the YAG phosphor to emit yellow light, and by combining this yellow light and blue light, a pseudo white color is extracted to realize a white LED. Yes. The white LED having this structure has a feature of high luminous efficiency.

  However, in the case of a pseudo white LED that emits a blue light emitting element and a YAG phosphor (yellow), the spectrum distribution as shown in the distribution A is shown, and the color is expressed by only two colors of blue light and yellow light. Therefore, the color reproduction range becomes narrow. On the other hand, when this white LED is incorporated as a light source in the illumination device of the present embodiment, the spectrum distribution as shown in the distribution B is shown, the spectrum is deformed as shown by the part surrounded by the broken line, and the blue light An emission spectrum that expresses colors is obtained in the form of three colors, green light and red light, and the color reproduction range is excellent.

  FIG. 7 is a diagram showing the improvement in color reproduction performance of the present invention. The broken line in FIG. 7 is the color gamut covered by the lighting device when the light control layer 20 of the present embodiment is provided on the CIE 1976 u′v ′ chromaticity diagram, and indicates the color reproduction range of the pseudo white LED of the light source. ing. On the other hand, the solid line in FIG. 7 is a color gamut covered by the lighting device when the light control layer 20 of the present embodiment is provided on the CIE 1976 u′v ′ chromaticity diagram, and the color of the lighting device of the present embodiment. The reproduction range is shown. As can be seen from this figure, the color reproduction range of green and red is expanded. Therefore, the lighting device of this embodiment can greatly improve the color reproduction performance.

  FIG. 8 shows one of the light control members in the illumination device of the present invention, (A) is a perspective view thereof, and (B) is a sectional view taken along the line CC of (A). The light control member in FIG. 8 is a light collecting sheet 6b with a prism. The condensing sheet 6b with a prism includes a prism 35 having a ridge formed by forming a plurality of V-shaped irregularities in parallel and at equal intervals on the light exit surface of a sheet-like substrate. The cross section of the prism 35 has a sawtooth shape. The material forming the light collecting sheet 6b with the prism is made of a colorless and transparent material because it needs to transmit the incident light beam.

  Looking at the cross section taken along the line CC in FIG. 8B, the prism 35 has a continuous triangle, and the bottom of each triangle is connected between the cross sections of each triangle to form a V-shaped groove. The light H incident on the condensing sheet 6b with the prism is collected from the prism 35 and emitted by the prism 35 having a predetermined angle, but the light incident at other angles is shown in FIG. As indicated by the locus of the arrow in the middle, the light is refracted by the prism 35 and returned as recursive light.

  FIG. 9 is a cross-sectional view showing another embodiment of the illumination device of the present invention. The structure of this lighting device includes an LED light source 12, a reflection sheet 9, a light guide plate 8, a light control layer 20, a diffusion sheet 6c, a condensing sheet 6b with a prism, and a polarization separation sheet 6a. Is. The diffusion sheet 6c, the condensing sheet with prism 6b, and the polarization separation sheet 6a are provided by being laminated in this order to constitute the optical sheet unit 6. Moreover, this illuminating device has the condensing sheet 6b with a prism, and the polarization separation sheet 6a for the purpose of improving the brightness | luminance of a liquid crystal display panel.

  The polarized light separating sheet 6a selectively reflects and reuses the polarized light component that is absorbed by the polarizing film located on the backlight side of the liquid crystal display panel in the incident illumination light by utilizing the light interference characteristic. By doing so, the luminance is improved. The polarization separation sheet 6a is provided on the side closest to the liquid crystal display panel.

  In the illuminating device shown in FIG. 9, the light emitted from the light guide plate 8 is incident on the optical sheet 6c with a microlens, condenses and diffuses, and part of the light is refracted so as to return light to the reflecting sheet 9 direction. Return to. Then, the light emitted from the optical sheet 6c with a microlens is incident on the condensing sheet 6b with a prism to collect the light and refract part of the light so as to return to the reflecting sheet 9 as recursive light. Furthermore, the light emitted from the light collecting sheet 6b with the prism is incident on the polarization separating sheet 6a, and the P-polarized component light that can be used in the liquid crystal display panel is transmitted among the incident light, and the S-polarized component that is not used in the liquid crystal display panel. Is returned to the direction in which the reflection sheet 9 is provided as recursive light.

  As described above, according to the illumination device shown in FIG. 9, the number of times of passing through the light control layer 20 is greatly increased by reusing the light reflected as the recursive light. Even if the pigment content ratio is significantly reduced or the colored layer is applied to a very thin layer, the color tone of the backlight emission H4 can be greatly changed to prevent deterioration of the color reproduction performance. it can.

  FIG. 10 is a sectional view showing the structure of the image display device of the present invention. The liquid crystal panel 4 is positioned and arranged by the panel chassis 7. The light guide plate 8 is formed in a size that is slightly larger than the liquid crystal panel 4 by a transparent plate-like member such as acrylic, and is disposed on the rear side so as to cover the entire back surface side of the liquid crystal panel 4.

  As the thickness of the light guide plate 8, for example, any value of 1 mm to 5 mm is adopted. The optical sheet portion 6 is formed by laminating a diffusion sheet, a prism sheet, or the like having the structure described above. The optical sheet unit 6 is disposed between the liquid crystal panel 4 and the light guide plate 8.

  The LED light source 12 employs a white LED that emits white light. Specifically, the LED light source 12 is configured by laminating a phosphor layer that is excited by blue light and emits yellow light on a light emitting surface of a semiconductor light emitting element that emits blue light. Thereby, white light which is the combined light of blue light and yellow light is emitted from the LED 12 light source. In order to protect the LED light source 12 from the external environment, the LED light source 12 is sealed with a sealing material having a small optical load, such as a synthetic resin having high transparency in the visible region.

  In the space surrounded by the LED light source 12, one side surface 8 a of the light guide plate 8, the panel chassis 7, and the reflection sheet 9, a light mixing unit 16 is formed. The light mixing unit 16 has a function of causing light emitted from the LED light source 12 to enter the side surface 8a of the light guide plate 8 while reducing unevenness in light intensity. The light emitted from the LED light source 12 passes through the light mixing unit 16 and directly enters one side surface 8a of the light guide plate 8 or is reflected by the inner surface of the panel chassis 7 or the reflection sheet 9 and then the light guide plate 8. Is incident on one side surface 8a.

  The light incident on the inside of the light guide plate 8 from the one side surface 8a is then guided while being totally reflected toward the central portion of the light guide plate 8, and is uniformed over the entire surface of the light guide plate through the optical sheet portion 6 as the liquid crystal panel 4. Irradiated to the back of the. At this time, in order to emit light from the LED light source 12 toward the liquid crystal panel 4 from the inside of the light guide plate 8 to the outside, the back surface of the light guide plate 8 is subjected to processing such as a dot pattern.

  FIG. 11 is a perspective view for explaining the LED board mounting structure of the present invention. The LED substrate has a plurality of LED light sources 12 as light sources mounted on a base substrate 11k. The LED light source 12 is a white LED. In the present embodiment, the liquid crystal panel 4 is caused to emit light by causing light from the LED light source 12 to be incident on one side surface 8 a that is a light incident surface of the light guide plate 8. The LED substrate is provided at a position corresponding to the upper side of the light guide plate 8 so as to enter the light guide plate 8 from one side.

  The plurality of LED light sources 12 are arranged at an equal pitch so as to be continuous in the longitudinal direction of the base substrate 11k. The LED light source 12 is provided with one anode electrode and one cathode electrode, and the LED light source 12 is turned on by applying a voltage between the electrodes. As a means for attaching the LED substrate to the upper rib body 2RT, for example, a heat-release adhesive tape 14 can be used.

  FIG. 12 is an exploded view for explaining the image display apparatus of the present invention. The image display device shown in FIG. 12 includes a front housing 1, a liquid crystal panel 4, an optical sheet unit 6, a panel chassis 7, a light guide plate 8, a reflective sheet 9, and a rear housing in order from the front side facing toward the drawing. The body 2 is configured.

  The front housing 1 has a rectangular frame shape formed by combining four frames 1ue, 1st, 1hd, and 1mg on the upper, lower, left, and right sides. In addition, ribs 1RT, 1RB, 1RL, and 1RR are respectively provided inside the four frames 1ue, 1st, 1hd, and 1mg of the front casing 1 to reinforce the rigidity of the front casing 1. The heat generated inside the housing 3 (see FIG. 13) is efficiently radiated to the outside of the image display device.

  A pair of LCD-DRV substrates 10 on which a circuit for driving the liquid crystal panel 4 is mounted via a flexible substrate 4f is connected to the lower edge of the liquid crystal panel 4 which is an image display panel. Further, from the right side of the liquid crystal panel 4, three film-like convex pieces 4 b protrude.

  The panel chassis 7 is formed in a frame shape by injection molding of resin, and is provided with a concave portion 7a that is recessed so as not to interfere with the convex piece 4b at a position corresponding to the convex piece 4b of the liquid crystal panel 4. .

  The rear housing 2 includes a board 2sk and four rib bodies attached to the board 2sk, an upper rib body 2RT, a lower rib body 2RB, a left rib body 2RL, and a right rib body 2RR. By providing these four rib bodies, the rigidity of the rear casing 2 can be strengthened, and the heat generated inside the casing 3 can be efficiently radiated to the outside of the image display device. The substrate 2sk is formed by, for example, pressing an aluminum plate having a thickness of 1.0 mm. The end of each side is bent to the front side to form a flange portion 2f. The LED board is attached to the inner surface (the side far from the flange 2f) of the rib body.

  FIG. 13 is a perspective view for illustrating the entire configuration of the image display apparatus of the present invention, as viewed from the front upper right. Here, the direction in which the display screen is visible is referred to as the front. This image display device is a monitor that displays a video signal input from the outside. An example in which the liquid crystal panel 4 is used as the display panel will be described.

  The image display apparatus includes a casing 3 in which a front casing (hereinafter also referred to as an F casing) 1 formed in a frame shape and a rear casing (hereinafter also referred to as an R casing) 2 are combined. ing. The housing 3 accommodates the liquid crystal panel 4 therein, and a display surface 4a that is an image display portion of the liquid crystal panel 4 is exposed to the outside from a rectangular opening 1a provided in the F housing 1. .

  The housing 3 is supported by a stand 5 attached to the back side of the housing 3 (the back side in FIG. 13), and the image display device can be installed on a floor surface or the like. Moreover, by removing the stand 5 and attaching a hanging tool or the like, it is possible to install only the housing 3 by ceiling or install it as a wall hanging.

  The F case 1 includes an upper frame 1ue and a lower frame 1st having portions extending to the left and right ends thereof, and a left frame 1hd and a right frame connected so as to connect the upper and lower frames 1ue and 1st in the vertical direction at the left and right ends thereof. It is a frame shape that forms a rectangle with 1 mg. A remote control light receiving window 1b is provided on the right side of the lower frame 1st.

  Although not shown, an LED-DRV board on which a drive circuit for driving the LED light source is mounted and the display of the liquid crystal panel 4 are controlled on the lower rear side of the R casing 2 of the image display device. A timing controller board is provided. In addition, a substrate and a power supply unit (not shown) on which a circuit for signal processing of the image display device is mounted are mounted, and various substrates and the power supply unit are entirely covered with a substrate cover.

  14A and 14B show another light control member in the illumination device of the present invention, in which FIG. 14A is a perspective view thereof, and FIG. 14B is a cross-sectional view taken along the line DD of FIG. The diffusion plate 37 with a prism is formed by containing light diffusing particles 36 having light diffusibility in a light transmissive resin serving as a base material.

  14B, the prism 35 formed on the upper part of the diffuser plate 37 with the prism is a prism having a protrusion formed by forming a plurality of V-shaped irregularities in parallel and at equal intervals. 35, it has a shape similar to the condensing sheet 6b with prism shown in FIG.

  The light incident on the diffusion plate 37 with prism is diffused inside the diffusion plate and enters the prism 35. For light having a predetermined angle, the light incident on the prism 35 is condensed from the prism 35 and emitted. Light incident at other angles is refracted by the prism 35 and returned as recursive light.

  In this embodiment, the example in which the light control layer 20 is applied to the optical sheet 6c with a microlens is shown. However, even if the light control layer 20 is applied to the diffusion plate 37 with a prism as shown in FIG. A similar effect can be obtained.

  In addition, when the light control member 31 is composed of a plurality of sheets, the number of sheets for providing the recursive function and the light control function may be all, and as described in the present embodiment, the light emission direction F is It may be one sheet located on the most opposite side.

  As described above in detail, according to the illumination device and the image display device of the present invention, the light control member recurs in a direction opposite to the light emission direction of the device by refracting or reflecting a part of the incident light. In addition, it has a dimming function that absorbs light at a specific wavelength or performs wavelength conversion, so that the material cost for dimming is minimized, and the pigment content is greatly reduced. Even if the colored layer is applied to be very thin, the color tone of the light emitted from the backlight can be greatly changed to prevent the color reproduction performance from being deteriorated.

  Further, according to the illumination device and the image display device of the present invention, one of the light control members composed of a plurality of sheets is located on the side opposite to the light emission direction F in the illumination device, and the recursive function and the light control function Therefore, the same effect can be obtained with this structure.

  Further, according to the illumination device and the image display device of the present invention, since the microlens or prism having a fine shape has a recursive function, light incident from the light guide plate can be passed through the light control layer many times.

  The present invention can be used for an image display device that displays an image using a display module such as a liquid crystal panel.

1 Front case (F case)
2 Rear housing (R housing)
3 Housing 4 Liquid crystal panel (display panel)
4a Display surface 5 Stand 6 Optical sheet portion 6a Polarization separation sheet 6b Condensing sheet 6c with prism Diffusion sheet 7 Panel chassis 8 Light guide plate 8a One side surface 9 of light guide plate Reflective sheet 10 LCD-DRV substrate 11k Base substrate 12 LED light source (light source) )
14 Adhesive Tape 16 Light Mixing Section 20 Light Control Layer 31 Light Control Member 34 Micro Lens 35 Prism

Claims (6)

A light source;
A light guide plate that guides light emitted from the light source and emits the light to a light control member;
A reflective sheet provided on a surface opposite to the light emitting surface of the light guide plate;
A light control member for controlling the light emitted from the light guide plate;
With
The light control member has a recursive function that refracts or reflects a part of incident light and recurs the light in a direction opposite to the light emission direction of the lighting device, and a light control function that performs light absorption or wavelength conversion of a specific wavelength. A lighting device characterized by that. A light source;
A light guide plate that guides light emitted from the light source and emits the light to a light control member;
A reflective sheet provided on a surface opposite to the light emitting surface of the light guide plate;
A light control member for controlling the light emitted from the light guide plate;
With
The light control member has a recursive function as a fine shape on the light exit surface that refracts or reflects a part of incident light and recurs the light in the direction opposite to the light exit direction of the lighting device, and absorbs light of a specific wavelength An illuminating device comprising a dimming function for performing wavelength conversion as a dimming layer including a pigment on a light incident surface. The light control member is configured by a plurality of sheets, and one sheet located on the most opposite side to the light emission direction in the lighting device has the recursive function and the dimming function. Or the illuminating device of 2. The illumination device according to claim 2, wherein the fine shape is formed by arranging a plurality of microlenses on a surface of a diffusion sheet. The illumination device according to claim 2, wherein the fine shape is formed as a prism by forming a plurality of V-shaped irregularities on the surface of the diffusion sheet. A backlight by the lighting device according to any one of claims 1 to 5,
A display module having a display surface for displaying an image;
An image display device comprising:

Images