JP3937745B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device having a reflector.
[0002]
[Prior art]
In recent years, application of liquid crystal display devices to personal computers (PCs), televisions, word processors, videos, and the like has progressed. On the other hand, liquid crystal images can be reflected by reflecting light incident from the outside without using a backlight in order to further increase the functionality and reduce the size, power consumption, and cost of such electronic devices. A reflective liquid crystal display device for display is desired.
[0003]
In such a reflection type liquid crystal display device, since no backlight is used, it is important to form an image by efficiently using incident light from the outside.
[0004]
As shown in FIG. 13A, the reflective film 4 used in the reflective liquid crystal display device is disposed below the liquid crystal layer 38 and reflects incident ambient light, but a part of the ambient light is on the upper substrate 2. The regular ambient light is reflected on the surface, and the remaining ambient light passes through the upper substrate 2 and the liquid crystal layer 38 and is reflected by the reflective film 4. If they are the same, the light source is recognized as being overlapped with the image of the liquid crystal display device, and there is a problem that the image becomes difficult to see and the visibility is lowered.
[0005]
Therefore, as shown in FIG. 13B, a pattern made up of a large number of projections and depressions 3 is arranged on the surface of the reflective film 4 so that incident light is scattered and reflected by the projections and depressions 3 as shown in FIG. What has been proposed is proposed. If the light incident on the reflection film 4 is scattered by the unevenness 3, the liquid crystal screen can be visually recognized using light that does not go in the same direction as the light that is regularly reflected by the upper substrate 2 among the scattered light. The liquid crystal screen can be viewed from a different direction from the regular reflected light on the upper substrate 2 and the visibility is improved.
[0006]
Then, as shown in FIG. 14B, the reflection angle α is adjusted by appropriately selecting the curvature of the surface of the convex portion 3a, and the light not directed in the same direction as the light regularly reflected by the liquid crystal panel is guided to the viewing position. Can do.
[0007]
[Problems to be solved by the invention]
However, if the surface of the concavo-convex 3 is formed with the same inclination angle and the concavo-convex shape is the same at any position of the reflective film 4, the incident light is reflected in a direction not used for visual recognition of the liquid crystal screen, which is useless The light is reflected in such a direction that the light use efficiency deteriorates.
That is, as shown in FIG. 14A, if the light incident on the reflecting film 4 spreads within the angle α with the concavo-convex 3 having a very small area, when the incident light enters the reflecting film 4 vertically, The light reflected by the reflective film 4 is divided into regions (II, II), (III, III) and a region IV excluding regions (I, I) where the reflected light from the reflective film 4 existing on both sides does not reach at all. Reflected.
[0008]
Of these regions, the region (II, II) is a region where only reflected light from a part (αL or αR) of the reflective film 4 can reach each other, and the region IV is reflected light from the entire reflective film 4. However, due to the regular reflection by the upper substrate 2, the contrast of the liquid crystal screen is deteriorated and the image recognition is difficult.
In the region (III, III), the reflected light from the left side αL and the right side αR of the reflecting plate 1 reaches and is not subjected to regular reflection by the upper substrate 2, so that the image on the liquid crystal screen can be recognized.
Therefore, it is desirable to use the region (III, III) as an effective visual field region for viewing the liquid crystal screen.
[0009]
However, the effective visual field region (III, III) is formed in a donut shape with the region IV at the center. Therefore, considering the case where this effective visual field area is used for a mobile phone, if there is a light source that is perpendicularly incident on the upper substrate in a reflective liquid crystal screen, the liquid crystal screen cannot be viewed from directly above. Tilt to see the screen. In that case, viewing from the left-right direction makes it easy for others to see, so it is natural to view the screen from diagonally upward (or diagonally downward) as shown in FIG. In order to form the emission region diagonally upward (or diagonally downward), it is necessary to impart directivity to the reflective surface of the reflector so that the reflected light of the effective visual field region (III, III) is collected.
[0010]
JP-A-61-270731 and JP-A-9-80426 are known in which the reflecting surface of the reflecting plate is inclined to give the reflected light directivity. However, these conventional techniques shift the light reflected by the region IV to the regions (I, I) where the reflected light does not reach at all, and reflect the reflected light to the effective field region (III, III). It is not intended to collect light, and the light use efficiency does not improve.
[0011]
Therefore, as shown in FIG. 10, a reflection type liquid crystal display device has been developed that imparts directivity to the reflection surface of the reflection plate so as to view the screen from obliquely above (or obliquely below).
[0012]
On the other hand, the conventional concavo-convex pattern 3 has many concave portions as shown in FIG. 13 formed in the resin thin film 6 of the reflecting plate 1, so that the convex portion or the concave portion of the reflective film 4 shown in FIG. Incident light perpendicularly incident on the surface of the substrate 2 is reflected in a conical shape having a predetermined angle with the perpendicular incident light as a center. Then, the incident light perpendicularly incident on the slope of the concave portion has a reflection angle that is further swung to one side and larger than the reflected light by the concave portion or the convex portion.
[0013]
The spread of the reflected light is centered on a line 50 that stands upright on the surface of the color filter portion 35 as shown in FIG. 12B, and the angle ψ = 0 to 0 in the counterclockwise direction as shown in FIG. An emission region of θ = 30 ° is formed over 360 °. This angle is generally set to 30 ° ± δ to brighten the surface of the liquid crystal display device.
[0014]
Now, as shown in FIG. 11, the refractive index N of the air layer is 1, the refractive index n of the upper substrate 2 which is a glass plate is 1.5, and the refractive indexes of the color filter portion 35 and the liquid crystal layer 38 are 1.5. In the vicinity, incident light incident on the surface of the upper substrate 2 at an incident angle of 34 ° is refracted at a refraction angle of 21.9 ° and reflected by the reflection film 4 at γ = 21.5 °. When the emission region is formed at θ = 30 °, it is diffusely reflected within about ± 19.5 ° in the glass, so that the diffuse reflected light 51 reaches the upper surface boundary of the upper substrate 2 at an incident angle i = 41 °.
[0015]
On the other hand, when the refraction angle is n = 1.519, when the critical angle ic = 41.2 °, the glass does not have any refracted light into the air and is totally reflected at the upper surface boundary of the upper substrate 2 and reflected light 51 ′. Then, it enters the adjacent color filter part 35 again. That is, i = γ + 19.5 °, and when the incident angle on the upper substrate 2 exceeds 34 °, γ is greater than 21.5 °, and i = 21.5 ° + 19.5 ° = 41 °. Thus, the critical angle ic exceeds 41.2 °, and there is a possibility of total reflection, and color blur occurs due to the total reflected light.
Therefore, there is a need for a reflector that restricts the spread of the emission area due to the reflected light of the reflective film, particularly for adjacent different color filter portions.
[0016]
SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a reflective liquid crystal display device capable of forming an emission area of reflected light in an effective visual field area obliquely above (or obliquely below) a reflective liquid crystal screen. And
Another object of the present invention is to provide a reflective liquid crystal display device free from color blur.
[0017]
[Means for Solving the Problems]
  The present invention includes a reflector having a plurality of unit reflection regions in which at least one unevenness for reflecting light is formed, and
  In a liquid crystal display device comprising a color filter portion disposed so as to face the surface on which the unit reflection region of the reflector is formed,
  Each color filter portion is arranged in a stripe shape,
  The reflection surface of the reflection film formed in each of the unit reflection regions extends in a direction intersecting with the stripe direction of the color filter portion,
  The reflective surface is an aggregate of split reflectors having split surfaces in a direction parallel to the stripe direction of the color filter portion, and each of the split reflectors isFor adjacent split reflectorsArranged by a predetermined amount in a direction parallel to the stripe direction of the color filter portion,
  The reflection surface between the tops of the two divided reflectors adjacent to each other in the direction parallel to the stripe direction of the color filter portion is a surface having a large inclination angle with respect to the direction perpendicular to the reflection plate And a surface having a small inclination angle with respect to the direction perpendicular to the reflecting plate,
  The inclination angle of the surface with the large inclination angle increases from the position corresponding to the center line of the reflection plate parallel to the extending direction of the reflection surface toward the edge of the reflection plate, and the inclination The inclination angle of the surface having a small angle is formed so as to decrease from the position corresponding to the center line of the reflecting plate parallel to the extending direction of the reflecting surface toward the edge of the reflecting plate. ,
  A plurality of emission spreads formed by the reflected light reflected by the reflection plate intersect each other at a predetermined position above the reflection plate to form a common emission area, and light incident on the reflection plate from a vertical direction is Depending on the predetermined position in the extending direction of the reflecting surface, the light is reflected substantially in the direction of the predetermined position center of the emission area, and the intensity center of each reflected light is condensed at the predetermined position center of the emission area. It is characterized by having constituted so.
[0018]
Here, the unit reflection region refers to a reflection region that is partitioned by a concave portion or a convex portion and reflects incident light.
The unit reflection region may be a reflection region partitioned by one concave portion or convex portion, or may be grasped as a plurality of aggregates. When the reflection region is partitioned by the concave portion, the inside is inevitably formed by a convex portion, and the convex portion becomes a flat surface having a uniform reflection angle inclined to one side, a convex spherical surface, or a convex aspherical surface. In addition, when divided by the convex portion, the inside is inevitably formed by a concave portion, and the concave portion becomes a flat surface with a uniform reflection angle inclined to one side, a concave spherical surface or a concave aspherical surface.
[0019]
In addition, the internal reflecting surface defined by the concave portion or the convex portion is not only a plane having a uniform reflection angle, but also has a small convex portion or a concave portion in the middle of the plane height that monotonously increases or decreases. Alternatively, the concave or convex spherical or aspherical surface may have a continuously changing curvature, or a minute convex or concave portion may be provided in the middle of the concave or convex spherical or aspherical surface.
[0020]
And in this invention, a reflective surface structure is formed in a substantially waveform using the said unit reflective area | region. The substantially waveform may be formed in a bowl shape as shown in FIG. 2A, for example, and its ridgeline may be formed horizontally in the extending direction, and many in a bowl shape as shown in FIG. They may be connected, and may be formed in a triangular prism shape as shown in (c), and their ridges may be formed horizontally in the extending direction. Also, as shown in (d), the triangular prism has a predetermined length. A plurality of the short triangular prisms may be connected by cutting them, and as shown in (e) and (f), the short triangular prisms or bowls may be arranged slightly shifted in the direction of the reflecting surface. .
[0021]
In the present invention, the corrugated ridge line of the reflecting surface structure formed in a substantially corrugated shape is formed substantially horizontally and disposed in a direction intersecting with the color filter portion disposed in a stripe shape. When the light is incident perpendicularly to the light source, the reflected light is hardly emitted in a direction crossing the stripe direction of the color filter portion. Therefore, the reflected light does not enter the adjacent color filter portion and color bleeding does not occur.
[0022]
  Here, “substantially reflected toward the center of the predetermined position of the emission region” means “a range that can be seen by an observer observing the liquid crystal display device, and allows a spread angle of about ± 30 °. Meaning “range”.
  “Condensing light at the center of a predetermined position in the emission area” means “It is desirable to collect light at one point, but some variation is allowed. The reflection surface where many of the corrugated reflection surfaces are located at a predetermined distance from one end is when the center of the ideal emission region at the predetermined position is the virtual center. In addition, if the intensity center of the reflected light is within the range of the divergence angle (± 30 °) with respect to the virtual center, the same effect is obtained and the light is condensed at the center of the emission area. .
  Therefore, since the reflecting surface of the reflecting surface structure is corrugated, a large number of centers of the emission area are formed from the one end to the other end, forming a rectangular or elliptical emission area. Will be.
[0023]
  It is also an effective means of the present invention that the reflector is arranged between the upper substrate and the lower substrate.
[0024]
According to such technical means, the reflector is disposed between the upper substrate and the lower substrate, and a plurality of emission spreads formed by the reflected light from the plurality of reflecting surface structures are respectively located at predetermined positions above the reflector. Since a common emission area is formed by intersecting with each other, the reflected light can be guided and condensed at a predetermined position above, respectively, and the light incident on the upper substrate from a certain direction can be The reflection surface structure is reflected toward the center of the predetermined position of the emission area by the predetermined position in the extending direction of the reflecting surface structure, and the reflected light intensity centers are concentrated at the predetermined center position of the emission area. Since the light is emitted and hardly emitted in the direction of the reflected light that is regularly reflected by the upper substrate, the liquid crystal display can be observed brightly by the condensed light flux in the emission region.
[0025]
  In addition, before the color filter portion is arranged in a direction intersecting with the color filter portion,TopIt is also effective that the width of the surface in the extending direction of the color filter portion is approximately 2 ° or less when viewed from the line connecting the reflective film recesses below the top portion. Means.
[0026]
According to this technical means, the width of the surface of the top portion of the corrugated ridge line in the extending direction of the color filter portion is narrow at about 2 ° or less, and therefore, there is little light that is not directed to the emission region observed by the observer, and it is bright An emission area can be formed. In addition, the reflected light from the surface opposite to the surface toward the emission region may be reflected by the color fill portion without going to the emission region, but is a color filter portion of the same color and has no color blur.
[0027]
In addition, incident light from the predetermined direction is reflected on the plurality of reflecting surfaces over substantially the entire emission area excluding the reflected light region formed by the reflected light regularly reflected by the upper substrate by the incident light from the predetermined direction. It is desirable that the reflected light reflected by the structure is emitted.
[0028]
According to such technical means, incident light from a certain direction is reflected by the upper substrate to become specularly reflected light, while there is light that is refracted into the upper substrate and reaches the reflecting surface structure. The reflected light that has been reflected is emitted from the upper substrate again, but the reflected light is emitted to substantially the entire emission area excluding the reflected light area formed by the regular reflected light. Is effectively used, and since there is no emission area in the same area as the regular reflection light, the illumination light source is not superimposed on the monitor screen.
[0029]
Further, it is desirable that the reflection angle of the reflection surface of the reflection surface structure formed in the substantially waveform is formed so as to decrease from the center position of the reflection plate toward the edge of the reflection plate. By such technical means, an emission area of reflected light can be formed on one side above the liquid crystal screen.
[0030]
By comprising in this way, since the other reflective surface on the opposite side to the one reflective surface which is the said reflective surface of the reflective surface structure formed in the substantially waveform cannot reflect light to the said output area side, Although the amount of spectral loss is lost, the reflecting surface of the reflecting surface structure can reflect approximately 70% or more of the incident light entering the reflecting surface to the emission region.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.
[0032]
FIG. 1 is a cross-sectional view illustrating a main part of a reflector according to an embodiment of the present invention, FIG. 2 is an explanatory diagram illustrating another embodiment of the uneven shape of the reflector, and FIG. 3 is a liquid crystal display. FIG. 4 is an explanatory diagram for explaining the reflection characteristics of the reflection plate.
[0033]
FIG. 1A shows a cross section of a reflective liquid crystal display device 10 composed of an upper substrate 2, a liquid crystal layer 38 and a reflector 1, and the reflector 1 is opaque or transparent made of ceramic, glass, plastic or the like. The lower substrate 11 is composed of the resin layer 6 and the reflective film 4. FIG. 1 is a schematic diagram, and is not drawn in consideration of the difference in refractive index between the layers of the liquid crystal layer 38, the upper substrate 2, and the like.
[0034]
In FIG. 1A, incident light 7 incident through the upper substrate 2 is partially reflected and returned by the surface 2 a of the upper substrate 2, but the light that has entered the upper substrate 2 reaches the reflective film 4. The reflective film 4 is disposed with the angles θL, θR, θL ′, and θR ′ between the incident light and the reflected light being different from the region A toward the central region Q.
[0035]
The reflected lights 8 and 9 form a substantially circular emission area 14L extending within the range of the angle α, and the reflected lights 18 and 19 form a substantially circular emission area 14R extending within the angle β. The centers 14La and 14Ra of the emission areas 14L and 14R are formed on a perpendicular line at a position spaced from the end of the reflective liquid crystal display device 10. The positions of the centers 14La and 14Ra are set to about 300 mm above the position about 10 mm away from the left and right ends, for example, when the left and right length of the reflective liquid crystal display device 10 in FIG. Therefore, the emission areas 14L and 14R are formed in an ellipse or a rectangular shape that substantially covers the width direction of the liquid crystal display device.
[0036]
The reflection film 4 is formed in a waveform in a direction penetrating the upper surface of FIG. 1 so as to be reflected left and right by reflected light 8 and 18 and reflected light 9 and 19 by vertical incident light 7 on the surface 2a of the upper substrate 2. Is done. As shown in (b), in the central portion C, the left side inclination angle αC and the right side inclination angle βC are equal, but the left side inclination angle αC increases and the right side inclination angle βC decreases as it goes to the left side. As it goes to the right, the left inclination angle αC becomes smaller, the right inclination angle βC becomes larger, αL> βL on the left side L, and αR <βR on the right side R.
[0037]
Note that the reflecting surface formed in the waveform has a curved continuous body as shown in FIG. 2A as long as αL, βL, αR, and βR satisfy the above relationship. ), And the reflective surfaces thereof may be continuums [(a), (c)] corresponding to the entire width of the display surface, ) May be an assembly of divided reflectors divided in the extending direction as shown in FIG. 5, and the divided reflectors may be crossed with the extending direction as shown in (e) and (f). A predetermined amount may be shifted.
[0038]
FIG. 3 is a plan view of the liquid crystal display device. The top of the panel corresponds to the left end of FIG. 1, and the bottom of the panel corresponds to the right end. The arrangement of the color filter portions is arranged in a stripe shape between the upper side and the lower side of the panel so as to intersect with the reflector having the reflective film 4 formed in a waveform.
[0039]
FIG. 4 is an explanatory diagram for explaining the reflection characteristics of the reflector according to the present embodiment. As shown in FIG. 4B, the reflective film 4 is inclined so that the uneven shape shown in FIGS. 2A to 2F corresponds to each arrangement position as shown in FIG. It is formed so that the angle changes. Therefore, as shown in FIG. 1, an emission region (FIG. 4 (a)) where light concentrates on 14L and 14R is formed.
[0040]
Therefore, when the emission region is formed at θ = 30 ° as in the conventional example, the diffuse reflection that had to be expected to be about ± 19.5 ° in the glass is set to a reflection angle of ± 1 to 7 to about 1/3. Even if the incident angle is larger than 34 °, the incident angle i of the incident light on the surface 2a of the upper substrate 2 due to the reflected light 51 from the reflective film 4 becomes smaller than 41.2 °, Color bleeding can be prevented without being totally reflected on the color filter portion.
On the other hand, the emission area is formed at θ = 30 ° in the vertical direction of the panel as in the conventional example, but even if total reflection light is generated in that direction, the color filter portion of the same color causes color bleeding. There is nothing.
[0041]
FIG. 5 is a configuration diagram of the reflecting surface of the reflecting surface structure 5 forming the emission region. In the figure, the concave portion 4b of the reflective surface 4 is positioned on a line 12 indicating the height position from the surface of the lower substrate 11, and the horizontal width of the top portion 4a of the reflective film 4 is the line directly below the top portion 4a. 12 Viewed from above, set to 2 ° or less.
[0042]
Therefore, almost all of the reflection surface S forming the emission area of the reflected light becomes the emission area because the horizontal width of the top portion 4a is 1 ° or less, and forms the emission area 14L of the reflected light of FIG. The relationship between the reflection surface S and the region T where the emission region 14L is not formed is as follows.
(S area) / (S area + T area) ≈0.70
Is set. The region T that does not form the emission region 14L forms the emission region 14R, and the reflected light 9 that does not form the emission region 14R forms the emission region 14L. Therefore, the reflected light 8 and the reflected light 9 are 70% or more. Reflected light can be used effectively.
[0043]
Next, the manufacturing method of the uneven | corrugated shape used for a reflecting plate is demonstrated. This concavo-convex shape can be replicated in large quantities by a mold called a stamper. The 2P method which is the manufacturing method will be described with reference to FIG.
(A) A substrate 11 is prepared, and an electron beam resist 22 is applied thereon.
(B) The resist 22 is finely processed by an electron beam to form a convex shape, and the concave / convex master 23 is produced.
(C) Next, a stamper material such as nickel is deposited on the master 23 by electroforming to produce a stamper 24.
(D) The stamper 24 and the master 23 are separated. The stamper 24 has a concave shape corresponding to the convex shape, and becomes a concave-convex mold.
[0044]
Next, the manufacturing method of the said reflecting plate is demonstrated using FIG. As described above, after the master 23 that is a model of the reflector is created, the stamper 24 is produced by electroforming, and the reversal pattern 24a of the reflector surface shape is formed on the stamper 24.
[0045]
Therefore, as described in (a), on a transparent substrate 11 such as a glass substrate or a transparent resin film (however, if the stamper transmits ultraviolet rays, the substrate 11 does not have to be transparent). After dropping the ultraviolet curable resin 6 onto the substrate 11, the stamper 24 is lowered onto the substrate 11 from above the ultraviolet curable resin 6, and the ultraviolet curable resin 6 is spread between the substrate 11 and the stamper 24. The ultraviolet curable resin 6 is filled in between.
[0046]
Next, as shown in FIG. 7B, the ultraviolet curable resin 6 is irradiated with ultraviolet rays from the substrate 11 side, and the ultraviolet curable resin 6 is cured by a photocuring reaction. When the ultraviolet curable resin 6 is cured, when the stamper 24 is peeled off from the ultraviolet curable resin 6, the reversal pattern 24a of the stamper 24 is reversed on the surface of the ultraviolet curable resin 6 as shown in FIG. Is done.
Thereafter, a metal thin film such as Ag or Al is deposited on the pattern 6a of the ultraviolet curable resin 6 by sputtering or the like to form the reflective film 4 as shown in FIG. 7D, thereby completing the reflective plate 1. Is done.
[0047]
Next, another manufacturing method of the reflector will be described with reference to FIG. As described above, after the master 23 that is a model of the reflector is created, the stamper 24 is produced by electroforming, and the reversal pattern 24a of the reflector surface shape is formed on the stamper 24.
[0048]
Then, as described in (a), after spin coating a resin 30 such as acrylic on the substrate 11, the stamper 24 is lowered from above the resin 30 as described in (b), and the resin As shown in FIG. 8C, the reversal pattern 24a of the stamper 24 is reversed and transferred as a pattern 30a on the surface of the resin 30.
Thereafter, a metal thin film such as Ag or Al is deposited on the pattern 30a of the resin 30 by sputtering to form the reflective film 4 as shown in FIG. 8D, whereby the reflective plate 1 is completed.
[0049]
FIG. 9 is a schematic diagram showing the structure of a reflective liquid crystal display device including the reflector manufactured as described above, and the upper substrate 2 is configured with the reflector 1 as the back substrate. That is, before the process shown in FIG. 7, the lower substrate 11 is formed by providing a thin film transistor (TFT) 32 on the surface of the reflector 1.
Thereafter, as described above, an uneven pattern made of a photosensitive resin is formed on the lower substrate 11, a contact hole 60 is formed at a position corresponding to the TFT 32, and a metal thin film is formed by sputtering in the uneven pattern and the contact hole 60. In addition, a conductive path that connects the reflective film 4 and the TFT 32 together with the reflective film 4 can be formed.
[0050]
On the other hand, a black matrix 36, a color filter 35, and a transparent electrode (ITO) 37 are formed on the back surface of the upper substrate 2, and a polarizing plate (not shown) is attached to the surface of the upper substrate 2 to form a front panel. Thereafter, the liquid crystal layer 38 is sandwiched between the transparent electrode (ITO) 37 and the reflective film 4 to complete the reflective liquid crystal display device.
[0051]
According to such a structure, the reflection type liquid crystal display device can be thinned by integrating the surface panel and the reflection plate.
[0052]
Note that the reflecting plate in this embodiment can be used not only in the reflective liquid crystal display device but also in other reflective display devices. Although not shown, the present invention can also be used for a so-called transflective liquid crystal display device in which the power of the backlight light source is reduced or incident light is taken in from a place other than the liquid crystal panel.
[0053]
What is shown in FIG. 10 is a wireless information transmission device 39 such as a mobile phone or a weak power type wireless device using the reflection type liquid crystal display device using the reflection plate in this embodiment for a display.
The wireless information transmission device 39 configured as described above is held from the upper emission region 14L (or the lower emission region 14R) with respect to the light that is gripped and incident at a right angle on the monitor screen 39a as shown in FIG. The image on the monitor screen 39a can be visually recognized.
[0054]
Therefore, even in the external light state where the specularly reflected light is present directly from the monitor screen 39a in the area other than the exit area 14L and the exit area 14R, particularly in the middle of the exit area 14L and the exit area 14R, the light source is the monitor screen 39a. Will not interfere with the viewing of the monitor screen.
[0055]
Needless to say, the present embodiment can be applied not only to the above-described wireless information transmission device 39 but also to portable information terminals such as electronic notebooks, portable computers, and portable televisions.
[0056]
Such wireless information transmission devices, portable information terminals, and the like require battery power saving because they are battery-powered. However, a backlight is not required by using a reflective liquid crystal display device, and power consumption can be reduced. Can do. Moreover, by using the reflection plate of the present embodiment for the reflective liquid crystal display device, the display screen can be brightened, the visibility is improved, and the visibility is directional. Visibility by others can be prevented.
[0057]
【The invention's effect】
As described above, according to the present invention, when light is vertically incident on the reflecting plate, the reflected light is hardly emitted in the direction intersecting with the stripe direction of the color filter portion. This prevents the reflected light from entering the color filter section and causing color bleeding.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a main part of a reflector according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram for explaining another embodiment of the uneven shape of the reflector.
FIG. 3 is a plan view of a liquid crystal display device.
FIG. 4 is an explanatory diagram for explaining reflection characteristics of a reflector.
FIG. 5 is a configuration diagram of a reflection surface of a reflection surface structure forming an emission region.
FIG. 6 is an explanatory diagram for explaining a stamper manufacturing method;
FIG. 7 is a diagram for explaining a method of manufacturing a reflecting plate.
FIG. 8 is a diagram for explaining another manufacturing method of the reflecting plate.
FIG. 9 is a schematic cross-sectional view of a reflective liquid crystal display device.
FIG. 10 is a perspective view of a wireless information transmission device.
FIG. 11 is an explanatory diagram of a conventional liquid crystal display device.
FIG. 12 is an explanatory diagram of a reflection state of a conventional reflective liquid crystal display device.
FIG. 13 is a diagram illustrating a problem in a conventional reflective liquid crystal display device.
FIG. 14 is a diagram showing the behavior of light reflected by a conventional reflector.
[Explanation of symbols]
1 reflector
5 Reflective surface structure
13 Unit reflection area
14 Output area

Claims (3)

A reflection plate having a plurality of unit reflection regions in which at least one unevenness for reflecting light is formed;
In a liquid crystal display device comprising a color filter portion disposed so as to face the surface on which the unit reflection region of the reflector is formed,
Each color filter portion is arranged in a stripe shape,
The reflection surface of the reflection film formed in each of the unit reflection regions extends in a direction intersecting with the stripe direction of the color filter portion,
The reflective surface is an aggregate of split reflectors having split surfaces in a direction parallel to the stripe direction of the color filter portion, and each of the split reflectors is arranged on the color filter portion with respect to an adjacent split reflector . Arranged by a predetermined amount in the direction parallel to the stripe direction,
The reflection surface between the tops of the two divided reflectors adjacent to each other in the direction parallel to the stripe direction of the color filter portion is a surface having a large inclination angle with respect to the direction perpendicular to the reflection plate And a surface having a small inclination angle with respect to the direction perpendicular to the reflecting plate,
The inclination angle of the surface with the large inclination angle increases from the position corresponding to the center line of the reflection plate parallel to the extending direction of the reflection surface toward the edge of the reflection plate, and the inclination The inclination angle of the surface having a small angle is formed so as to decrease from the position corresponding to the center line of the reflecting plate parallel to the extending direction of the reflecting surface toward the edge of the reflecting plate. ,
A plurality of emission spreads formed by reflected light reflected by the reflection plate intersect each other at a predetermined position above the reflection plate to form a common emission area, and light incident on the reflection plate from a vertical direction is Depending on the predetermined position in the extending direction of the reflecting surface, the light is reflected substantially in the direction of the predetermined position center of the emission area, and the intensity center of each reflected light is condensed at the predetermined position center of the emission area. A liquid crystal display device characterized by being configured to do so.   The liquid crystal display device according to claim 1, wherein the reflection plate is disposed between the upper substrate and the lower substrate.   The width of the surface of the top portion arranged in the direction intersecting with the color filter portion in the extending direction of the color filter portion is a width of about 2 ° or less when viewed from the line connecting the reflective film concave portions under the top portion. The liquid crystal display device according to claim 1, wherein:

Images