JP2004109644A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device with which display light is easily produced with reflection of ambient light and which is constructed so as to be suitable for use as a transflective liquid crystal display device by making illumination light from a backlight unit nearly vertically incident on a display element such as a liquid crystal panel with an action of a lens, controlling a visual region (range of emission) of the display light and, in addition, dynamically controlling the visual region of the display light with the action of the lens of a lens sheet. <P>SOLUTION: The display device is constructed by disposing the lens sheet having a projecting and recessing shape which constitutes a lens part on the illuminating light source side, between the liquid crystal panel and the backlight unit so as to guide the illumination light nearly vertically to the liquid crystal panel with a condensing action. Furthermore, positions corresponding to the condensing action of the lens part become apertures and a light shielding pattern with partial openings is formed on the side opposite to the lens part so as to make the condensed illumination light pass through the apertures. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device, such as a liquid crystal panel, provided with a backlight system for irradiating from the back side a display element whose display pattern is defined according to transmission / non-transmission or a transparent state / scattering state in pixel units. Regarding improvement.
As the display device using a liquid crystal panel,
(1) A reflective liquid crystal display device that does not have a built-in light source such as a backlight or an edge light and generates display light by ambient light such as sunlight or indoor illumination light.
(2) A reflection type liquid crystal display device that uses not only ambient light such as sunlight and indoor illumination light but also a front light disposed on the front side (observer side) of a liquid crystal panel as a built-in light source of the device.
(3) A transmissive liquid crystal display device of a type in which illumination light from a built-in light source such as a backlight or an edge light is mainly used to generate display light regardless of ambient light such as sunlight or indoor illumination light.
(4) A transflective liquid crystal display device that uses both illumination light from a built-in light source such as a backlight and an edge light and ambient light such as sunlight and indoor illumination light to generate display light.
The present invention is applied to the types (3) and (4).
[0002]
[Prior art]
2. Description of the Related Art In recent years, liquid crystal display devices using liquid crystal panels made of TFTs and STNs have been commercialized mainly for (color) notebook PCs (personal computers) in the OA field.
In such a liquid crystal display device, a method of arranging a light source on the back side (non-viewer side) of the liquid crystal panel and irradiating the liquid crystal panel with light from the light source, that is, a so-called backlight method has been conventionally used. ing.
As such a backlight system, a light source lamp such as a cold cathode fluorescent lamp (CCFT) is roughly mounted along a side end portion of a flat light guide plate made of acrylic resin or the like having excellent light transmittance. There is a "light guide plate light guide system (so-called edge light system)" in which light from the light is reflected multiple times in the light guide plate, and a "direct type system" which does not use the light guide plate.
[0003]
As a liquid crystal display device equipped with a light guide plate light guide type backlight system, for example, one having a configuration as shown in FIG. 5 is generally known.
In this case, a liquid crystal panel 72 sandwiched between polarizing plates 71 and 73 is provided on the upper part, and a light guide plate made of a substantially rectangular plate-like transparent base material such as PMMA (polymethyl methacrylate) or acrylic is provided on the lower surface side. A diffusion film (diffusion layer) 78 is provided on the upper surface (light emission surface) of the light guide plate.
Further, on the lower surface of the light guide plate 79, a scattered reflection pattern portion for scattering and reflecting the light introduced into the light guide plate 79 efficiently and uniformly toward the liquid crystal panel 72 is provided by printing or the like ( (Not shown), and a reflection film (reflection layer) 77 is provided below the scattering reflection pattern portion.
[0004]
Further, a light source lamp 76 is attached to the light guide plate 79 along a side end portion. Further, in order to make the light of the light source lamp 76 enter the light guide plate 79 efficiently, the rear side of the light source lamp 76 is mounted. A high-reflectance lamp reflector 81 is provided to cover. The scattering reflection pattern portion is formed by printing a mixture obtained by mixing white titanium dioxide (TiO2) powder with a solution such as a transparent adhesive in a predetermined pattern, for example, a dot pattern, and drying and forming the mixture. The light incident on the light plate 79 is provided with directivity to guide the light toward the light exit surface, which is one means for achieving high luminance.
[0005]
Recently, a prism film (prism layer) having a light condensing function is provided between the diffusion film 78 and the liquid crystal panel 72 as shown in FIG. ) 74 and 75 are proposed. The prism films 74 and 75 are provided for condensing light emitted from the light exit surface of the light guide plate 79 and diffused by the diffusion film 78 to the effective display area of the liquid crystal panel 72 with high efficiency.
[0006]
However, in these methods exemplified in FIGS. 5 and 6, the control of the visual field range is left only to the diffusivity of the diffusion film 78, and the control is difficult, and the central part in the diffusion direction is bright and goes to the peripheral part. The characteristic of darkening is inevitable. For this reason, the brightness of the liquid crystal screen when viewed from the side is greatly reduced, and the light use efficiency is reduced.
Further, the method using the prism film illustrated in FIG. 6 requires two prism films, which not only causes a large decrease in the amount of light due to the absorption of the film but also increases the cost due to an increase in the number of members. Had also become.
[0007]
On the other hand, the direct type is used for a display device such as a large liquid crystal TV in which it is difficult to use a light guide plate.
As a direct type liquid crystal display device, a configuration illustrated in FIG. 7 is generally known. In this case, a liquid crystal panel 72 sandwiched between polarizing plates 71 and 73 is provided at an upper portion, and a row of light sources 51 including fluorescent tubes and the like is provided at a lower surface thereof. Surface) is provided with a diffusion film (diffusion layer) 74.
Further, recently, in order to increase the light use efficiency and achieve higher luminance, a prism film (prism layer) having a light condensing function is provided between the diffusion film 74 and the liquid crystal panel 72 as in the case of FIG. ) Has been proposed.
The prism film concentrates light emitted from the light source 51 and diffused by the diffusion film 74 onto the effective display area of the liquid crystal panel 72 with high efficiency.
[0008]
However, even in the configuration illustrated in FIG. 7, the control of the visual field range is left only to the diffusivity of the diffusion film 74, and the control is difficult. Inevitable. For this reason, the brightness of the liquid crystal screen when viewed from the side is greatly reduced, and the light use efficiency is reduced. Further, in the method using a prism film, the number of prism films is required two, which not only causes a large decrease in the amount of light due to absorption of the film, but also causes an increase in cost due to an increase in the number of members.
On the other hand, if the interval between the light sources is too wide, luminance unevenness is likely to occur on the screen, and the number of light sources cannot be reduced, leading to an increase in power consumption and an increase in cost.
[0009]
By the way, in such a liquid crystal display device, light weight, low power consumption, and high luminance are strongly demanded as market needs, and accordingly, a backlight system mounted on the liquid crystal display device is also lightweight, low power consumption. Power and high brightness are required.
In particular, recently, in a color liquid crystal display device, which is undergoing remarkable development, the panel transmittance of the liquid crystal panel is much lower than that of a monochrome liquid crystal panel. This is an indispensable issue for obtaining power consumption.
However, with the conventional configuration as described above, it is difficult to say that the demands for high luminance and low power consumption are sufficiently satisfied in today's liquid crystal display devices, which are further reduced in thickness. Development of a backlight system capable of realizing a liquid crystal display device with high luminance, high display quality, and low power consumption has been awaited.
[0010]
In view of the above situation, the applicant has
A liquid crystal panel; and a light source means for irradiating the liquid crystal panel with light from the back side. The light source means is provided with a lens layer for guiding light from the light source to the liquid crystal panel, and has an aperture near the focal plane of the lens layer. There has been proposed a liquid crystal display device characterized by having a light-shielding portion having the following. (For example, see Patent Document 1)
[0011]
[Patent Document 1]
JP 2000-284268 A
Patent Document 1 discloses a configuration in which a lens sheet having a light-shielding portion is disposed between a liquid crystal panel and a backlight unit as shown in FIGS. 1 to 3. In each of FIGS. 3A and 3B, the lens sheet has an uneven shape forming a lens portion on the liquid crystal panel side.
The function and effect of interposing the lens sheet having the above configuration is that the diffusivity of the light emitted from the light guide plate is modulated by the lens function, and the light can be emitted in the same direction toward the liquid crystal panel. is there.
In addition, by forming a light-shielding portion having an opening at a specific location, it is possible to selectively increase the amount of light incident on the pixels of the liquid crystal panel, thereby improving the use efficiency of the backlight, and Controlling the shape also makes it possible to control the viewing area of the display light.
[0013]
[Problems to be solved by the invention]
In the present invention, a main object is to propose a backlight unit that can be used not only for a transmissive liquid crystal display device but also for a transflective liquid crystal display device in which ambient light can be used as display light. .
In addition, in using the backlight, not only the function of making the illumination light substantially perpendicular to the liquid crystal panel, but also the ability to dynamically control the viewing area (the range of emission) of the display light by the function of the lens. Aim.
[0014]
[Means for Solving the Problems]
In the display device according to the present invention, in order to achieve the above object, a lens sheet having a concave and convex shape forming a lens portion on the illumination light source side is disposed between the liquid crystal panel and the backlight unit, and the illumination light is transmitted to the liquid crystal panel. To be guided substantially perpendicular to and with a light collecting action.
That is, the display device according to the present invention described in claim 1 is:
A display element whose display pattern is defined according to a transmission / non-transmission or a transparent state / scattering state in a pixel unit is irradiated with illumination light from an illumination light source arranged on the side opposite to a viewer, and the display element is turned on. In a display device configured to generate display light by passing through and emit to the observer side,
Immediately before the illumination light is incident on the display element, a configuration having a lens sheet formed with a plurality of lenses for guiding the illumination light to the display element with a light condensing action,
The lens sheet has an uneven shape forming a lens portion on the side of the illumination light source, the display element side is a flat surface,
The flat surface has a configuration in which a portion corresponding to the light-condensing action of the lens portion serves as an opening, and a light-shielding pattern having a partial opening is formed so that illumination light subjected to the light-condensing action is transmitted. It is characterized by the following.
[0015]
The display device according to the present invention described in claim 10 is:
A display element whose display pattern is defined in accordance with a transmission / non-transmission or a transparent state / scattering state in a pixel unit is irradiated with illumination light from an illumination light source arranged on the side opposite to a viewer, and the display element is In a display device configured to generate display light by passing through and emit to the observer side,
Immediately before the illumination light is incident on the display element, a configuration having a lens sheet formed with a plurality of lenses for guiding the illumination light to the display element with a light condensing action,
The lens sheet has a concave-convex shape forming a first lens portion on an illumination light source side, and a portion corresponding to a light condensing action of the first lens portion on the display element side has translucency, When the illumination light subjected to the light condensing action by the first lens section is transmitted, the concave and convex shape forming the second lens section having a plurality of unit lenses is formed so as to be emitted again by the refraction action by the lens section. It is characterized by having the structure having.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First embodiment>
FIG. 1 is an explanatory diagram showing an embodiment in which the present invention is applied to a liquid crystal display device having an edge light type backlight unit.
A liquid crystal panel 12 sandwiched between polarizing plates 11 and 13 is provided on an upper portion, and a light guide plate 79 made of a transparent substrate such as a substantially rectangular plate-like PMMA (polymethyl methacrylate) or acrylic is provided on a lower surface side. The reflection film (reflection layer) 77 is provided below the light guide plate 79.
A light source lamp 76 is attached to the light guide plate 79 along the side end, and further covers the rear side of the light source lamp 76 so that light from the light source lamp 76 is efficiently incident on the light guide plate 79. And a high-reflectance lamp reflector 81 is provided.
The light guide plate 79 has a function of emitting guided light by roughening a part of the surface or placing printing ink on the surface.
[0017]
The lens sheet 16 has a concavo-convex shape forming a lens portion on the side of the illumination light source, and is disposed between the liquid crystal panel 12 and the light guide plate 79 as illustrated.
The light emitted from the light guide plate 79 is incident on a lens portion (irregular surface), is refracted by each unit lens, and is condensed near the focal plane for each unit lens.
As the shape of the unit lens, there are a semi-cylindrical convex cylindrical lens (so-called lenticular) and a hemispherical convex lens (so-called fly-eye lens or microlens), and the types of lenses and the parallel direction of the cylindrical lenses are combined in a plurality of directions. Things are selected according to the purpose.
[0018]
A light-shielding layer 14 having an opening (light collecting portion) corresponding to each unit lens is arranged near the focal plane of each unit lens constituting the lens sheet 16. Light emitted from the light guide plate 79 passes only through the opening of the light shielding layer 14. The light that has passed through the opening of the light-shielding layer 14 is bent by the lens unit, so that the light exits at an angle θ depending on the curvature and size of the lens.
The emission angle range θ increases as the curvature increases, when the distance between the lenses forming the lens layer 16 is constant, and increases as the distance increases, when the curvature is constant.
[0019]
In addition, the opening of the light shielding layer 14 becomes larger as the emission angle range θ is larger. Therefore, when changing the emission angle between the horizontal direction and the vertical direction, it is necessary to change the horizontal size and the vertical size of the opening.
In general, a display (hereinafter, confused with a “display device”) is required to have a wider viewing area in a horizontal direction than a viewing area in a vertical direction. As shown in FIG. 4, it is necessary to make the horizontal direction wider than the vertical direction.
As described above, since light can be efficiently distributed within a required viewing zone, unnecessary light components are reduced, and a bright display image can be obtained with high energy efficiency.
[0020]
In the present invention, since the light is spread not by the diffusion component but by the condensing and diverging effects of the lens, it is possible to observe a display image with a small change in luminance and good image quality within the emission angle θ. Light emitted from the light guide plate 79 and having a noise component that causes a change in luminance is blocked by the light shielding layer 14.
[0021]
When the incident side (the light guide plate 79 side in the figure) of the light shielding layer 14 is a reflection surface, the light of the noise component blocked by the light shielding layer 14 is returned to the light guide plate 79 by the reflection surface, and the light guide plate 79. And the light is reflected by the reflective layer 77.
The light reflected by the surface of the light guide plate 79 or the reflection layer 77 passes through the light guide plate 79 again and is incident on the lens layer 16 to be reused, so that the light use efficiency can be improved.
[0022]
Furthermore, by making the reflection surface formed on the light shielding layer 14 a scattering reflection surface, the noise light is scattered, thereby increasing the probability that the reused light passes through the opening of the light shielding layer 14, and further increasing the use of light. Efficiency can be improved.
[0023]
On the other hand, when the emission side of the light-shielding layer 14 (the liquid crystal panel 12 side in the figure) is used as a reflection surface, the peripheral light entering the liquid crystal panel 12 from the observer side is formed on the emission side of the light-shielding layer 14. By being reflected by the reflecting surface, ambient light can be used as illumination light for the liquid crystal display.
Furthermore, by making the reflection surface on the emission side of the light-shielding layer 14 a scattering reflection surface, the surrounding light is scattered, so that the viewing range of the liquid crystal display due to the surrounding light can be expanded. A liquid crystal display used outdoors has a drawback that when the periphery is bright, the brightness of the backlight becomes relatively dark and a bright display image cannot be obtained. In addition, since ambient light can be used as illumination light for a liquid crystal display, it is possible to observe a good image even in bright outdoors.
Therefore, it can be used as a transflective liquid crystal display device.
[0024]
Further, in order to prevent the occurrence of moiré due to the relationship between the periodicity of the unit lens or the aperture and the periodicity of the pixels of the liquid crystal panel, the interval between the unit lenses constituting the lens sheet 16 is set to be one pixel interval of the liquid crystal panel 12. / 3 or less.
[0025]
<Embodiment 2>
FIG. 2 is an explanatory view showing an embodiment in which the present invention is applied to a liquid crystal display device having a direct type backlight unit.
A liquid crystal panel 12 sandwiched between polarizing plates 11 and 13 is provided at an upper portion, and a light source 51 such as a fluorescent tube is arranged as a light source for illumination on a lower surface side. In order to efficiently use the light from the light source 51 as illumination light, a reflector 52 is disposed on the back of the light source 51. The light emitted by the light source 51 is adjusted in direction by the reflector 52 and enters the lens sheet 16.
The lens sheet 16 has a concavo-convex shape forming a lens portion on the side of the illumination light source, and is disposed between the liquid crystal panel 12 and the light source 51 as illustrated.
[0026]
A light-shielding layer 14 having an opening (light collecting portion) corresponding to each unit lens is arranged near the focal plane of each unit lens constituting the lens sheet 16.
The light reflected by the reflector 52 enters the lens sheet 16, is bent by each lens, and passes only through the opening of the light shielding layer 14. Since the light that has passed through the opening of the light-shielding layer 14 is bent by the lens unit, the light is condensed in the vicinity of the focal plane for each lens and then emitted at an angle θ depending on the curvature and size of the lens.
[0027]
The emission angle range θ increases as the curvature increases, when the distance between the lenses forming the lens layer 16 is constant, and increases as the distance increases, when the curvature is constant. In addition, the opening of the light shielding layer 14 becomes larger as the emission angle range θ is larger. Therefore, when changing the emission angle between the horizontal direction and the vertical direction, it is necessary to change the horizontal size and the vertical size of the opening.
In general, a display is required to have a wider viewing zone in the horizontal direction than the viewing zone in the vertical direction. In this case, the opening of the light shielding layer 14 needs to be wider in the horizontal direction than in the vertical direction. As described above, since light can be efficiently distributed within a required viewing zone, unnecessary light components are reduced, and a bright display image can be obtained with high energy efficiency.
[0028]
In the present invention, since the light is spread not by the diffusion component but by the condensing and diverging effects of the lens, it is possible to observe a display image with a small change in luminance and good image quality within the emission angle θ. The light emitted from the light source 51 and having a noise component that causes a change in luminance is blocked by the light shielding layer 14.
[0029]
When the incident side (the light source 51 side in the figure) of the light shielding layer 14 is a reflection surface, the light of the noise component blocked by the light shielding layer 14 is returned to the reflector 52 by the reflection surface and is reflected again.
The light reflected by the reflector 51 is reused by being incident on the lens layer 16 again, so that the light use efficiency can be improved.
[0030]
Furthermore, by making the reflection surface formed on the light shielding layer 14 a scattering reflection surface, the noise light is scattered, thereby increasing the probability that the reused light passes through the opening of the light shielding layer 14, and further increasing the use of light. Efficiency can be improved.
[0031]
On the other hand, when the emission side of the light-shielding layer 14 (the liquid crystal panel 12 side in the figure) is used as a reflection surface, the peripheral light entering the liquid crystal panel 12 from the observer side is formed on the emission side of the light-shielding layer 14. By being reflected by the reflecting surface, ambient light can be used as illumination light for the liquid crystal display.
Furthermore, by making the reflection surface on the emission side of the light-shielding layer 14 a scattering reflection surface, the surrounding light is scattered, so that the viewing range of the liquid crystal display due to the surrounding light can be expanded. A liquid crystal display used outdoors has a drawback that when the periphery is bright, the brightness of the backlight becomes relatively dark and a bright display image cannot be obtained. In addition, since ambient light can be used as illumination light for a liquid crystal display, it is possible to observe a good image even in bright outdoors.
Therefore, it can be used as a transflective liquid crystal display device.
[0032]
Further, in order to prevent the occurrence of moiré due to the relationship between the periodicity of the unit lens or the aperture and the periodicity of the pixels of the liquid crystal panel, the interval between the unit lenses constituting the lens sheet 16 is set to be one pixel interval of the liquid crystal panel 12. / 3 or less.
[0033]
<Embodiment 3>
FIG. 3 is an explanatory diagram showing another embodiment in which the present invention is applied to a liquid crystal display device having an edge light type backlight unit.
In the present embodiment, the lens sheet 16 has a remarkable feature in that the lens sheet 16 has a concave and convex shape forming a lens portion not only on the illumination light source side but also on the backlight unit side. The other components are the same as those of the first embodiment, and thus the description is omitted.
[0034]
The second lens unit 21 (in the figure, on the side of the liquid crystal panel 12) is located near the focal plane of the first lens unit 16 (in the figure, on the side of the light guide plate 79), and directs the illumination light in the front direction of the display. Has the effect of bending.
Therefore, by disposing the second lens unit 21 in the vicinity of the focal plane of the first lens unit 16 and the unit lens constituting the second lens unit so as to form a pair with the unit lens constituting the first lens unit, By designing the shape of each unit lens so that the first and second unit lenses have a synergistic effect, even if the direction of light incident from the light guide plate is inclined with respect to the display surface, the display surface Can be emitted perpendicular to the light.
[0035]
Further, even if the size of the opening of the light-shielding layer 15 is made larger than that of the first and second embodiments, the viewing angle range can be controlled. It is possible to increase efficiency.
In the present embodiment, the case where the present invention is applied to an edge light type backlight unit has been described. However, as in Embodiment 2, the present invention is also applicable to a direct type backlight unit. Needless to say, it's good.
[0036]
【The invention's effect】
The illumination light from the backlight unit can be made to enter the display element such as a liquid crystal panel substantially perpendicularly by a lens function, and the viewing area (the emission range) of the display light can be controlled by controlling the aperture shape. In addition to the effect of the prior art that the display area can be controlled, the present invention realizes that the viewing zone of the display light can be dynamically controlled by the lens action of the lens sheet.
As a particularly remarkable effect, when a reflection surface is formed on the display element side of the light-shielding portion formed on the lens sheet, the reflection surface is located on the back surface immediately after the display element, so that the ambient light is reflected and the display light is reflected. It is easy to produce and is suitable for use as a transflective liquid crystal display device.
If a reflective surface is formed on the backlight side of the light-shielding part, wasteful illumination light can be reused, and ambient light of the environment where the display is observed can be used as illumination light, thereby saving energy and brighter observation images. Can be obtained.
As described above, according to the present invention, a low-cost, high-brightness, high-quality display device with low power consumption can be provided.
[0037]
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a liquid crystal display device according to the present invention.
FIG. 2 is an explanatory diagram illustrating an example of a liquid crystal display device according to the present invention.
FIG. 3 is an explanatory view showing an example of a liquid crystal display device according to the present invention.
FIG. 4 is a plan view showing an example in which a shape of an opening provided in a light shielding portion is long in a horizontal direction in the liquid crystal display device of the present invention.
FIG. 5 is an explanatory diagram showing a configuration example of a conventional liquid crystal display device.
FIG. 6 is an explanatory diagram showing a configuration example of a conventional liquid crystal display device.
FIG. 7 is an explanatory diagram showing a configuration example of a conventional liquid crystal display device.
[Explanation of symbols]
11, 13, 71, 73 ... Polarizers 12, 72 ... Liquid crystal panels 14, 78 ... Diffusion film 15 ... Light shielding layer 16 ... Lens sheet 18 ... Light shielding opening 21 ... Second lens parts 51, 76 ... Light sources 52, 81 … Reflectors 74, 75… Prism film (prism layer)
77 ... Reflection film (reflection layer)
79 ... Light guide plate

Claims (12)

A display element whose display pattern is defined according to a transmission / non-transmission or a transparent state / scattering state in a pixel unit is irradiated with illumination light from an illumination light source arranged on the side opposite to a viewer, and the display element is turned on. In a display device having a configuration in which the display light is generated by passing through, and emitted to the observer side,
Immediately before the illumination light is incident on the display element, a configuration having a lens sheet formed with a plurality of lenses for guiding the illumination light to the display element with a light condensing action,
The lens sheet has an uneven shape forming a lens portion on the illumination light source side, the display element side is a flat surface,
The flat surface has a configuration in which a portion corresponding to the light condensing action of the lens unit becomes an opening, and a light-shielding pattern having a partial opening is formed so that the illumination light subjected to the light condensing action is transmitted. A display device characterized by the above-mentioned. 2. The display device according to claim 1, wherein the light shielding pattern is formed with a light reflecting surface that reflects at least one of incident light from an illumination light source side and incident light from a display element side. 3. The display device according to claim 1, wherein the display element is a liquid crystal display element. The display device according to claim 2, wherein the reflection surface is a scattering reflection surface. The display device according to claim 1, wherein the lens unit has a configuration in which semi-cylindrical convex cylindrical lenses are arranged in parallel. The display device according to claim 5, wherein the semi-cylindrical convex cylindrical lenses are arranged in parallel in a plurality of directions. The display device according to claim 1, wherein the lens unit has a configuration in which hemispherical convex lenses are two-dimensionally arranged. The display device according to claim 1, wherein a shape of the opening is wider in a horizontal direction than in a vertical direction. 9. The display device according to claim 1, wherein an arrangement interval of the unit lenses forming the lens unit is equal to or less than の of a pixel interval in the display element. A display element whose display pattern is defined according to a transmission / non-transmission or a transparent state / scattering state in a pixel unit is irradiated with illumination light from an illumination light source arranged on the side opposite to a viewer, and the display element is turned on. In a display device having a configuration in which the display light is generated by passing through, and emitted to the observer side,
Immediately before the illumination light is incident on the display element, a configuration having a lens sheet formed with a plurality of lenses for guiding the illumination light to the display element with a light condensing action,
The lens sheet has a concave-convex shape forming a first lens portion on an illumination light source side, and a portion corresponding to a light condensing action of the first lens portion on the display element side has translucency, When the illumination light that has been condensed by the first lens unit is transmitted, the concave and convex shape that constitutes the second lens unit having a plurality of unit lenses is formed so as to be emitted again by being refracted by the lens unit. A display device comprising: The display device according to claim 10, wherein a light-shielding pattern is formed around each unit lens constituting the second lens unit. The display device according to claim 11, wherein the light-shielding pattern is formed with a light reflecting surface that reflects at least one of incident light from an illumination light source side and incident light from a display element side.

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