JP2006276621A - Electro-optical device, lighting device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electro-optical device, a lighting device, and an electronic apparatus capable of preventing luminance from lowering, and improving output efficiency of backlight. <P>SOLUTION: The electro-optical device comprises an electro-optical panel equipped with a plurality of pixels and a lighting device equipped with a light guide plate and a light source for irradiating illumination light to the electro-optical panel. The light guide plate has linear ridges on the light entrance face or the face opposite to the light entrance face. A prism sheet having a prism face on which a plurality of cross-sectional triangular and linear ridges are formed is disposed between the lighting device and the electro-optical panel in a way that the prism face is directed in the direction opposite to the electro-optical device. The lines of the plurality of the ridges on the light guide plate and the lines of the plurality of the ridges on the prism sheet are arranged in parallel. The lines 40 of the ridges on the light guide plate and the prism sheet intersect with the arrangement direction 21a of the pixels of the electro-optical panel at an angle of 1° or more. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electro-optical device, a lighting device, and an electronic apparatus.

Conventionally, a liquid crystal display device is known as an electro-optical device. Among them, a transmissive liquid crystal display device having a backlight provided on the back side of the liquid crystal panel is generally known. As this type of backlight, a cold cathode tube is provided on the side end surface of a transparent light guide plate. In general, a light source including a light source such as a light-emitting diode and a light guide plate having a structure for emitting light incident from the light source to the liquid crystal panel side while propagating inside the light source is generally used.
In this type of liquid crystal display device, in order to increase display brightness, a transparent plate having a large number of linear protrusions formed so that the cross-sectional shape is substantially triangular and the ridges thereof are substantially parallel is used. Technology is known. Furthermore, in this technique, it is possible to prevent the occurrence of striped patterns (moire fringes) on the surface of the liquid crystal display panel by arranging the ridge lines of the linear convex portions formed on the transparent plate diagonally ( For example, see Patent Document 1.)
Japanese Patent No. 3175103

However, in the above-mentioned patent document, there is no problem when the optical pattern of the light guide plate is a dot pattern and two or more lens sheets are used, but when the prism pattern of the light guide plate is used alone, the surface brightness of the backlight. There is a problem that decreases. In addition, there is a problem in that it is difficult to efficiently extract the backlight light because the emission angle varies depending on the prism surface on which the same light strikes.
SUMMARY An advantage of some aspects of the invention is that it provides an electro-optical device, an illumination device, and an electronic apparatus that can suppress a decrease in luminance and improve the emission efficiency of backlight light. It is aimed.

Furthermore, the present inventor has found that in the liquid crystal display device, not only the above-described reduction in luminance and illumination light emission efficiency is caused, but also the moiré fringes appear in the display image when the pixel pitch and the prism sheet pitch are slightly deviated. Has been found to occur.
Therefore, the present inventor has come up with the present invention having the following means based on the above.

That is, the electro-optical device of the present invention includes an electro-optical material sandwiched between a first substrate and a second substrate, a first polarizing plate disposed on the outside of the first substrate and the second substrate, and An electro-optical device having a second polarizing plate and including a plurality of pixels, and an illumination device that includes a light guide plate and a light source and irradiates illumination light to the electro-optical panel. The light guide plate includes a plurality of linear protrusions formed on a light incident surface on which the illumination light is incident or a surface opposite to the light incident surface, and the illumination device and the light guide plate A prism sheet having a prism surface in which a plurality of protrusions having a triangular cross section and a linear shape are arranged between the electro-optic panel and the prism surface facing away from the electro-optic panel. Ridge lines of a plurality of protrusions on the optical plate, and the prism The ridge lines of the plurality of ridges on the sheet are arranged in parallel, and the ridge lines of the ridges on the light guide plate and the prism sheet intersect with the arrangement direction of the pixels of the electro-optical panel at an angle of 1 ° or more. It is characterized by that.
Moreover, it is preferable that the ridgeline of the said protrusion in the said light-guide plate and the said prism sheet | seat, and the array direction of the said pixel of the said electro-optical panel cross | intersect at an angle of 2-10 degrees.

Here, an electro-optic material, an electro-optic panel, or an electro-optic device has an electro-optic effect that changes the light transmittance by changing the refractive index of the material by an electric field, and converts electrical energy into optical energy. It is a collective term including things to do. Therefore, it is a concept including a light emitting device represented by a liquid crystal device, an organic EL (Electro-Luminescence) device, an inorganic EL device, and the like.
Further, in the first substrate and the second substrate, the side where the electro-optic material is sandwiched is the inside, and the side where the electro-optic material is not arranged is the outside.

  As described above, since the ridge lines of the plurality of protrusions on the light guide plate and the ridge lines of the plurality of protrusions on the prism sheet are arranged in parallel, the highly directional light emitted from the light guide plate is projected on the protrusions of the prism sheet. It is possible to irradiate the strip. Furthermore, the brightness | luminance fall of the illumination light irradiated toward a electro-optical panel from a prism sheet is suppressed, and the emission efficiency of illumination light can be improved.

In addition, the ridge line of the protrusions in the light guide plate and the prism sheet and the arrangement direction of the pixels of the electro-optic panel intersect at an angle of 1 ° or more, more preferably at an angle of 2 to 10 °, Moire fringes caused by shifting the prism sheet pitch can be reliably prevented.
Therefore, according to the present invention, it is possible to realize both prevention of moire fringes and improvement in the luminance of illumination light.

In the electro-optical device according to the aspect of the invention, a diffusion sheet is provided between the electro-optical panel and the prism sheet.
Here, since the light that has passed through the light guide plate and the prism sheet has directivity, the viewing angle of the electro-optical panel display image tends to be narrow. Therefore, the viewing angle of the display image can be widened by providing the diffusion sheet as in the present invention. Furthermore, since the glare of the display image is suppressed, the appearance of the display image can be improved.
In addition, as described above, the ridge line of the protrusions on the light guide plate and the prism sheet and the arrangement direction of the pixels intersect at an angle of 1 ° or more, which causes the appearance of the display image to deteriorate. However, the appearance of the display image can be improved by providing the diffusion sheet.

In the electro-optical device according to the aspect of the invention, a reflective polarizer is provided between the electro-optical panel and the prism sheet.
Here, the reflective polarizer has a function of transmitting or reflecting the illumination light of the illumination device. A part of the light irradiated to the reflective polarizer is transmitted through the reflective polarizer and irradiates the electro-optical panel. In addition, the illumination light reflected by the reflective polarizer returns to the illumination device, is emitted again toward the reflective polarizer, and is reused. Most of this reused light is reflected again by the reflective polarizer, but the polarization state changes as this reflection is repeated, so some of the light is transmitted through the reflective polarizer to become display light, resulting in a result. As a result, the amount of display light can be increased. Therefore, the luminance can be improved.

In the electro-optical device according to the aspect of the invention, a light scattering resin layer is provided between the electro-optical panel and the reflective polarizer.
Here, the light scattering resin layer is a layer film that functions as an adhesive for bonding the electro-optical panel and the reflective polarizer.

According to the present invention, since the light scattering resin layer is provided between the electro-optical panel and the reflective polarizer, it is possible to bond while embedding the uneven surface between the electro-optical panel and the reflective polarizer. It becomes. When the uneven surface remains, the display image has a glare feeling, but by providing the light scattering resin layer, it is possible to realize a display image in which the uneven surface is embedded and the glare feeling is suppressed.
In addition, since the light that has passed through the light guide plate and the prism sheet has directivity, the display image of the electro-optical panel tends to have a narrow viewing angle, but by providing a light scattering resin layer, The viewing angle of the display image can be widened.
In addition, as described above, the ridge line of the protrusions on the light guide plate and the prism sheet and the arrangement direction of the pixels intersect at an angle of 1 ° or more, which causes the appearance of the display image to deteriorate. However, the appearance of the display image can be improved by providing the light scattering resin layer.

  The illumination device of the present invention is an illumination device that includes a light guide plate and a light source and irradiates the electro-optical panel with illumination light, and the light guide plate has a light incident surface on which the illumination light is incident, or A plurality of linear ridges formed on the surface opposite to the light incident surface are arranged, and a plurality of ridges having a triangular cross section and a linear shape are provided between the light guide plate and the electro-optical panel. Are arranged with the prism surface facing away from the electro-optical panel, and a plurality of ridges of the ridges on the light guide plate, and a plurality of ridges on the prism sheet. Are arranged in parallel, and the ridge lines of the protrusions in the light guide plate and the prism sheet intersect with the arrangement direction of the pixels of the electro-optical panel at an angle of 1 ° or more. It is said.

Thus, since the ridge lines of the plurality of protrusions on the light guide plate and the ridge lines of the plurality of protrusions on the prism sheet are arranged in parallel, the highly directional light emitted from the light guide plate is projected on the prism sheet. It is possible to irradiate the illumination light toward the electro-optical panel by suppressing the decrease in luminance of the illumination light emitted from the prism sheet toward the electro-optical panel.
In addition, since the ridges of the protrusions on the light guide plate and the prism sheet intersect with the pixel arrangement direction of the electro-optical panel at an angle of 1 ° or more, the moiré fringes generated when the pixel pitch and the pitch of the prism sheet are shifted. Can be prevented.
Therefore, according to the present invention, it is possible to achieve both prevention of moire fringes and improvement in the luminance of illumination light.

  According to another aspect of the invention, an electronic apparatus includes the electro-optical device described above. If it does in this way, it will become an electronic device provided with the display part by which suppression of a feeling of glare, high brightness, and prevention of moire fringe were realized.

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

(First embodiment of liquid crystal display device)
First, a first embodiment of the electro-optical device of the invention will be described.
FIG. 1 is a cross-sectional configuration diagram of a liquid crystal display device according to an electro-optical device of the present invention. A liquid crystal display device (electro-optical device) 10 shown in this figure includes a transflective liquid crystal panel (electro-optical panel) 11, a prism sheet 32, and a backlight (illumination device) 30.

The liquid crystal panel 10 sandwiches a liquid crystal layer (electro-optical material) 15 made of TN (Twisted Nematic) liquid crystal between an array substrate 13 and a counter substrate 14 that are arranged to face each other, and has a substantially frame shape in plan view. This is an active matrix type liquid crystal panel that is sealed with the sealing material 12.
The array substrate 13 includes a transparent lower substrate (second substrate) 16 made of glass or the like, and a plurality of pixels 21 are arranged in a matrix in a plan view on the liquid crystal layer 15 side. Includes a pixel electrode 22 made of a transparent conductive material and a TFT (Thin Film Transistor) element 23 connected to the pixel electrode 22 for switching the pixel electrode 22. Although not shown, an alignment film is formed on the pixel 21.
A lower polarizing plate (second polarizing plate) 24 and a diffusion sheet 25 are laminated in this order from the array substrate 13 side on the outer surface side (the side opposite to the liquid crystal layer 15) of the lower substrate 16. Here, the diffusion sheet 25 diffuses light having high directivity incident on the liquid crystal panel 10 to make the display image of the liquid crystal panel 10 have a wide viewing angle.

  The counter substrate 14 includes a transparent upper substrate (first substrate) 17 made of glass or the like, and a counter electrode 18 made of a transparent conductive material formed in a solid shape on the liquid crystal layer 15 side, and the counter electrode 14. And an alignment film 19 formed so as to cover the electrode 18. An upper polarizing plate (first polarizing plate) 20 is provided on the outer surface side of the upper substrate 17. Further, the upper polarizing plate 20 and the lower polarizing plate 24 are arranged so that their transmission axes are orthogonal to each other.

  The backlight 30 includes a flat transparent light guide plate 33 and light emitting elements such as cold cathode tubes and LEDs (Light Emitting Diodes) disposed on one end face (left end face in the drawing) of the light guide plate 33. The light source 35 includes a light guide plate 33 and a reflection plate 34 provided on the back side of the light guide plate 33 (the side opposite to the liquid crystal panel 11).

Here, the light guide plate 33 and the prism sheet 32 will be described in detail with reference to FIG.
FIG. 2 is an enlarged cross-sectional view of the light guide plate 33 and the prism sheet 32, and is a view for explaining the configuration and optical path of both.
As shown in FIG. 2, the light guide plate 33 is a flat plate member made of a transparent resin material such as an acrylic resin, and is opposite to the light incident surface 33 c on which the illumination light is incident on the liquid crystal panel 11 and the prism sheet 32. On the surface, a plurality of linear protrusions 33a arranged in plural and a plurality of inclined surfaces 33b corresponding to the plurality of protrusions 33a are formed. In other words, the protrusion 33a and the inclined surface 33b are formed on the surface on the side where the light guide plate 33 and the reflection plate 34 face each other.

  Further, the protrusion 33a extends in the direction perpendicular to the paper surface. As a result, the light source 35 emits light, and the emitted light La is reflected between the inclined surface 33b and the light incident surface 33c in the light guide plate 33, and the direction of the emitted light La gradually changes to reflect the light guide plate. Proceed in the direction of 33 extension. Then, when the emitted light La exceeds the critical angle, the light guide plate 33 emits light having a shallow angle as light guide light Lb, and the light guide light Lb enters the prism sheet 32. As a result, the light guide plate 33 functions as a highly directional light guide plate that causes the light guide light Lb having high directivity to enter the prism sheet 32.

On the other hand, the prism sheet 32 is a flat plate member made of a transparent resin material such as an acrylic resin, and a prism surface 32b on which a plurality of protrusions 32a extending in the direction perpendicular to the paper surface is formed. have. The prism surface 32 b is disposed in the opposite direction to the liquid crystal panel 11. In other words, the prism surface 32 b is disposed toward the light guide plate 33. The prism sheet 32 is arranged so that the extending direction (ridge line) of the protrusion 32 a is parallel to the extending direction (ridge line) of the protrusion 33 a of the light guide plate 33. Further, the plurality of protrusions 32a are continuously formed in parallel with each other, and the apex angle α of the plurality of protrusions 32a is common to all the protrusions 32a. The apex angle α is set in the range of 63 ° to 68 °.
In the present embodiment, the shape of the prism surface 32b is exemplified as having a pointed top with a triangular section, but a shape with a rounded top of the protrusion 32a can be used without any problem.

In such a prism sheet 32, when the light guide light Lb having directivity emitted from the light guide plate 33 enters from the prism surface 32b, the light is reflected on the opposite prism surface 32b through the protrusion 32a, and the prism sheet 32 is incident on the liquid crystal panel 11 as illumination light Lc from the upper surface 32c.
Such illumination light Lc is light obtained by passing the highly directional light guide light Lb through the prism sheet 32, and has less loss than the light amount of the light source 35. Therefore, the effect of controlling the illumination light by the prism sheet 32 can be enhanced.

  In addition, since the prism surface 32 b of the prism sheet 32 is disposed so as to face the light guide plate 33, external light incident on the liquid crystal display device 10 and transmitted through the liquid crystal panel 11 is reflected on the inner surface side of the prism sheet 32. Thus, it can be used as display light when external light is incident. Accordingly, off-axis reflection of incident light can be performed by the prism sheet 32 arranged in the direction shown in FIG. 1, and external light can be used efficiently during reflection display. That is, the light reflected by the prism sheet 32 includes a component that is emitted in a direction shifted from the regular reflection direction in addition to the regular reflection light. In the liquid crystal display device 10 of the present embodiment, By allowing the component light to be emitted in a direction shifted to the normal direction side of the prism sheet 11 (front direction of the liquid crystal panel 11) from the specularly reflected light, transmissive display using the light of the light guide plate 33 Reflected light of outside light is used as display light in substantially the same direction.

  Next, the ridgelines of the protrusions 33a and 32a and the arrangement direction of the pixels 21 will be described in detail with reference to FIG. FIG. 3 is a partial plan view of the liquid crystal display device 10 for explaining the relationship between the ridgelines of the protrusions 33a and 32a in the light guide plate 33 and the prism sheet 32 and the arrangement direction of the pixels 21 in the liquid crystal panel 10. FIG.

In FIG. 3, reference numeral 21 a denotes a direction (left-right direction on the paper surface) in which a plurality of pixels 21 in the liquid crystal panel 10 are arranged. Reference numeral 40 denotes the extending direction of the ridge lines of the protrusions 33 a and 32 a in the light guide plate 33 and the prism sheet 32. In addition, a bias angle formed by the arrangement direction 21a and the ridge line extending direction 40 is θ. Reference numeral 35 a denotes the direction of emitted light that the light source 35 enters on one side end face of the light guide plate 33. In this embodiment, the bias angle (crossing angle) θ is set in the range of 2 to 10 °.
In FIG. 3, light source light 35 a is incident from a direction orthogonal to the arrangement direction 21 a of the pixels 21. Therefore, by setting the bias angle θ in the range of 2 to 10 °, the angle at which the light source light 35a enters the ridge line extending direction 40 is in the range of 90 to 98 °.

As described above, in the liquid crystal display device 10 of the present embodiment, the ridge line of the protrusion 33a of the light guide plate 33 and the ridge line of the protrusion 32a of the prism sheet 32 are arranged in parallel. Highly directional light to be emitted can be emitted toward the protrusion 32a of the prism sheet 32, and a decrease in luminance of illumination light emitted from the prism sheet 32 toward the liquid crystal panel 11 is suppressed, and illumination light is emitted. Efficiency can be improved.
Further, since the ridge line extending direction 40 and the arrangement direction 21a of the pixels 21 intersect each other at an angle of 2 to 10 °, it is possible to reliably prevent moiré fringes caused by a shift in pixel pitch and prism sheet pitch. Therefore, it is possible to realize both prevention of moire fringes and improvement in the luminance of illumination light.

Moreover, in this embodiment, since the diffusion sheet 25 is provided, the viewing angle of the display image of the liquid crystal panel 11 can be expanded. Furthermore, since the glare of the display image is suppressed, the appearance of the display image can be improved.
In addition, as described above, the ridge lines of the protrusions 33a and 32a on the light guide plate 33 and the prism sheet 32 and the arrangement direction 21a of the pixels 21 are intersected at an angle of 1 ° or more. Although the appearance of the image tends to decrease, the appearance of the display image can be improved by providing the diffusion sheet 25.

In the present embodiment, the light guide plate 33 includes a plurality of linear protrusions 33a arranged on the surface opposite to the light incident surface 33c, and a plurality of inclined surfaces corresponding to the plurality of protrusions 33a. 33b is formed.
In the present invention, a plurality of linear protrusions 33a arranged on the light incident surface 33c of the light guide plate 33 and a plurality of inclined surfaces 33b corresponding to the plurality of protrusions 33a may be formed. As a result, the light source 35 emits light, so that the emitted light La is reflected between the inclined surface 33b and the light incident surface 33c in the light guide plate 33, and the direction of the emitted light La gradually changes to reflect the light guide plate. Proceed in the direction of 33 extension. Then, when the emitted light La exceeds the critical angle, the light guide plate 33 emits light having a shallow angle as light guide light Lb, and the light guide light Lb enters the prism sheet 32. As a result, the light guide plate 33 functions as a highly directional light guide plate that causes the light guide light Lb having high directivity to enter the prism sheet 32.
Therefore, the same effect as the first embodiment can be obtained.

(Second Embodiment of Liquid Crystal Display Device)
Next, a second embodiment of the electro-optical device according to the invention will be described.
FIG. 4 is a cross-sectional configuration diagram of a liquid crystal display device according to the electro-optical device of the present invention.
In the present embodiment, only the configuration different from the above-described first embodiment will be described, and the same configuration is denoted by the same reference numeral and description thereof is omitted.

The liquid crystal display device (electro-optical device) 10 ′ of this embodiment has a lower polarizing plate 24, a light scattering layer (light scattering resin layer) 27, and a reflection on the outer surface side (the side opposite to the liquid crystal layer 15) of the lower substrate 16. A polarizing plate (reflection polarizer) 26 is laminated in order from the array substrate 13 side.
Here, the reflective polarizing plate 26 has a function of transmitting or reflecting the illumination light of the backlight 30.
More specifically, a part of the illumination light incident on the reflective polarizing plate 26 from the upper surface 32c of the prism sheet 32 passes through the reflective polarizing plate 26 and enters the liquid crystal panel 11, and is used as display light. Further, the component reflected by the reflective polarizing plate 26 is incident on the backlight 30, is reflected again by the prism sheet 32 or the reflecting plate 34 of the backlight 30, is incident on the liquid crystal panel 11, and is reused. Most of the reused light is reflected again by the reflective polarizing plate 26. However, since the polarization state changes while repeating such reflection, a part of the light is transmitted through the reflective polarizing plate 26 as display light. As a result, the amount of display light can be increased.

  The light scattering layer 25 diffuses highly directional light incident on the liquid crystal panel 10 to make the display image of the liquid crystal panel 10 have a wide viewing angle. The light scattering layer 25 is, for example, an adhesive material having light diffusibility, and serves as an adhesive that bonds the lower polarizing plate 24 and the reflective polarizing plate 26. Further, the light scattering layer 25 serving as an adhesive is bonded while embedding the uneven surface between the lower polarizing plate 24 and the reflective polarizing plate 26.

As described above, since the liquid crystal display device 10 ′ according to the present embodiment includes the reflective polarizing plate 26, the illumination light can be reused, and the luminance of the liquid crystal display device 10 ′ can be improved.
Further, when the uneven surface between the lower polarizing plate 24 and the reflective polarizing plate 26 remains, the display image has a glare feeling, but the uneven surface is embedded by providing the light scattering layer 27, A display image with reduced glare can be realized.
Further, since the light that has passed through the light guide plate 33 and the prism sheet 32 has directivity, the display angle of the liquid crystal panel 11 tends to be narrow, but the light scattering layer 27 is provided. Thus, the viewing angle of the display image can be expanded.
In addition, as described above, the ridge lines of the protrusions 33a and 32a on the light guide plate 33 and the prism sheet 32 and the arrangement direction 21a of the pixels 21 are intersected at an angle of 1 ° or more. Although the appearance of the image tends to be lowered, the appearance of the display image can be improved by providing the light scattering layer 27.

In addition, although the transflective liquid crystal display device is shown as the liquid crystal display device 10 or 10 'in the above-described embodiment, the present invention is not limited to this, and can be applied to a transmissive liquid crystal display device. Is possible.
Further, the liquid crystal display devices 10 and 10 ′ are active matrix type using TFT, but other than this, the present invention can also be applied to an active matrix type using TFD (Thin Film Transistor).
Further, in the liquid crystal display devices 10 and 10 ′, the liquid crystal layer 15 is in the TN mode, but in addition to this, the STN (Super Twisted Nematic) mode, VA (Vertical Alignment) mode, or IPS (In Plane Switching). A liquid crystal layer such as a mode can be employed. Further, the present invention can be applied to any liquid crystal in a normally black mode or a normally white mode.

(Electronics)
Next, a specific example of an electronic apparatus including the liquid crystal device according to the above embodiment will be described.
FIG. 5 is a perspective view showing an example of a mobile phone (electronic device). In FIG. 5, reference numeral 500 denotes a mobile phone body. Reference numeral 501 denotes a display unit provided with the liquid crystal display device 10 shown in FIG. 1 or the liquid crystal display device 10 ′ shown in FIG. 4 as display means.
Since the electronic device shown in FIG. 5 includes the liquid crystal device 10 of the above-described embodiment in a display unit, the electronic device includes a display unit that realizes suppression of glare, high luminance, and prevention of moire fringes. It becomes.

Hereinafter, the effects of the present invention will be made clearer by examples.
FIG. 4 is a diagram for explaining the relationship between the bias angle θ in FIG. 3 and the luminance ratio of the liquid crystal display device 10. Here, the luminance ratio is a value indicating the ratio of the luminance of the illumination light emitted from the prism sheet 32 to the luminance of the light source light 35a. Therefore, the utilization efficiency of the light source light 35a is increased as the luminance ratio is higher, and the utilization efficiency of the light source light 35a is decreased as the luminance ratio is lower.
FIG. 4 shows experimental results for the liquid crystal display device 10 having a screen size of 2.1 inches and a resolution of QCIF.

And according to this inventor, as shown in FIG. 4, it was confirmed that a brightness | luminance ratio falls as a bias angle becomes large. Further, it was confirmed that when the bias angle is 0 °, moire fringes are generated in the display image. Furthermore, it was confirmed that when the bias angle is in the range of 2 to 10 °, a luminance ratio of about 0.9 to 1.0 can be realized and moire fringes are not generated in the display image.
Therefore, as has been clarified in the present embodiment, both the prevention of moire fringes and the improvement of the luminance of illumination light can be realized in the liquid crystal display device by setting the bias angle within the range of 2 to 10 °. .

1 is a cross-sectional configuration diagram showing a first embodiment of a liquid crystal display device according to an electro-optical device of the invention. FIG. 2 is an enlarged cross-sectional view of a light guide plate and a prism sheet of the liquid crystal display device shown in FIG. The figure which shows the relationship between the protrusion ridgeline and pixel arrangement direction in the liquid crystal display device shown in FIG. FIG. 6 is a cross-sectional configuration diagram illustrating a liquid crystal display device according to a second embodiment of the electro-optical device of the invention. FIG. 11 is a perspective view illustrating a mobile phone according to an electronic apparatus of the invention. The figure which shows the measurement result of the bias angle and luminance ratio in the Example of this invention.

Explanation of symbols

10, 10 'liquid crystal display device (electro-optical device), 11 liquid crystal panel (electro-optical panel), 15 liquid crystal layer (electro-optical material), 16 lower substrate (second substrate), 17 upper substrate (first substrate), 20 Upper polarizing plate (first polarizing plate), 21 pixels, 24 Lower polarizing plate (second polarizing plate), 25 Diffusion sheet, 26 Reflecting polarizing plate (reflective polarizer), 27 Light scattering layer (light scattering resin layer), 30 Backlight (lighting device), 32 prism sheet, 32a protrusion (protrusion of prism sheet), 32b prism surface, 33 light guide plate, 33a protrusion (projection of light guide plate), 35 light source, 500 mobile phone (electronic equipment) ), Lc illumination light.

Claims (7)

An electro-optic material sandwiched between a first substrate and a second substrate; a first polarizing plate and a second polarizing plate respectively disposed on the outside of the first substrate and the second substrate; An electro-optical panel including the pixels;
An illumination device that includes a light guide plate and a light source and irradiates the electro-optical panel with illumination light;
An electro-optical device comprising:
The light guide plate has a linear protrusion formed by arranging a plurality of light incident surfaces on which the illumination light is incident on the electro-optical panel, or a surface opposite to the light incident surface,
A prism sheet having a prism surface in which a plurality of protrusions having a triangular cross-section and a straight line are arranged between the illumination device and the electro-optical panel is arranged with the prism surface facing away from the electro-optical panel. Arranged,
The ridge lines of the plurality of ridges in the light guide plate, and the ridge lines of the plurality of ridges in the prism sheet are arranged in parallel,
The ridge line of the protrusions in the light guide plate and the prism sheet, and the arrangement direction of the pixels of the electro-optical panel intersect at an angle of 1 ° or more,
An electro-optical device. The ridge line of the ridge in the light guide plate and the prism sheet and the arrangement direction of the pixels of the electro-optical panel intersect at an angle of 2 to 10 °,
The electro-optical device according to claim 1. A diffusion sheet is provided between the electro-optical panel and the prism sheet;
The electro-optical device according to claim 1 or 2. A reflective polarizer is provided between the electro-optic panel and the prism sheet;
The electro-optical device according to claim 1 or 2. A light scattering resin layer is provided between the electro-optical panel and the reflective polarizer;
The electro-optical device according to claim 4. An illumination device that includes a light guide plate and a light source and irradiates an electro-optical panel with illumination light,
The light guide plate has a linear protrusion formed by arranging a plurality of light incident surfaces on which the illumination light is incident on the electro-optical panel, or a surface opposite to the light incident surface,
A prism sheet having a prism surface in which a plurality of protrusions having a triangular shape and a linear shape are arranged between the light guide plate and the electro-optical panel, with the prism surface facing away from the electro-optical panel. Arranged,
The ridge lines of the plurality of ridges in the light guide plate, and the ridge lines of the plurality of ridges in the prism sheet are arranged in parallel,
The ridge line of the protrusions in the light guide plate and the prism sheet, and the arrangement direction of the pixels of the electro-optical panel intersect at an angle of 1 ° or more,
A lighting device characterized by the above. The electro-optical device according to claim 1 is provided.
Electronic equipment characterized by

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