JP2007025188A - Electrooptical apparatus and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical apparatus having an optical function and a heating function at the same time, capable of suppressing thickening and degradation of visibility. <P>SOLUTION: The electrooptical apparatus 100 comprises; an electrooptical panel 130 in which an electrooptical material is arranged between substrates; and an optical sheet 120 in which a light modulation structure 124 for giving optical directivity and a heating structure 122 for irradiating heat are integrally provided. The electrooptical panel and the optical sheet are arranged so as to overlap each other in plane and contact each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electro-optical device and an electronic apparatus, and particularly to a configuration of an electro-optical device including an optical sheet having a light modulation function.

  In general, an electro-optical device such as a liquid crystal display device includes an optical sheet that includes an optical modulation structure that modulates transmitted light in order to limit the viewing angle of a display screen. As this type of optical sheet, there is a viewing angle limiting sheet called a louver layer or the like in which a light absorbing material and a light transmitting material are alternately arranged in a plane direction. Such a viewing angle restriction sheet makes the display visible only within a specific viewing angle range. For example, when it is not desired to display the display content by surrounding people, or for in-car use such as a car navigation device This display device is required when it is desired to prevent display light from being reflected on the windshield and obstructing the driver's field of view (for example, see Patent Document 1 below).

On the other hand, in an electro-optical device such as a liquid crystal display device, display performance may be degraded at a low temperature. To prevent this, a device incorporating a heating element is known (for example, see Patent Document 2 below). ). The heating element is a heat-generating wiring pattern made of ITO and having translucency, and is brought into contact with a liquid crystal display panel in the liquid crystal display device. By providing this heating element, the liquid crystal display panel can be heated, so that the response speed of the liquid crystal display panel can be improved.
JP 2003-279951 A JP-A-8-71084

  By the way, for example, in an in-vehicle liquid crystal display device, it is necessary to prevent the transfer to the windshield as described above, and at the same time, to prevent the response speed from being lowered in a low temperature environment. Even a device cannot achieve the above two objectives at the same time.

  In order to achieve the above two objects at the same time, it is necessary to provide a viewing angle limiting sheet and a heating element, respectively. Since light absorption occurs, there is a problem that the light transmittance is lowered and the visibility is deteriorated.

  Therefore, the present invention solves the above-mentioned problems, and the problem is to realize a configuration of an electro-optical device that has an optical function and a heating function at the same time and can suppress increase in thickness and deterioration in visibility. It is in.

  In view of such circumstances, the electro-optical device of the present invention includes an electro-optical panel in which an electro-optical material is disposed between substrates, a viewing angle limiting layer and a heat generating layer that emit light with directivity applied to incident light. The electro-optical panel and the optical sheet are arranged so as to overlap each other and are in contact with each other.

  According to the present invention, the optical function can be secured by the viewing angle limiting layer and the heating function can be secured by the heat generating layer, so that desired optical characteristics can be obtained by the light directivity of the viewing angle limiting layer. Therefore, it is possible to prevent malfunction of the electro-optical panel due to the low temperature. In addition, by using an optical sheet that is integrally provided with a viewing angle limiting layer and a heat generating layer, the number of parts can be reduced, and a reduction in thickness and cost can be achieved. Furthermore, since the transmittance can be increased as compared with the case where the viewing angle limiting layer and the heat generating layer are provided separately, a bright display can be obtained.

  In the present invention, it is preferable that the optical sheet includes the heat generating layer on the electro-optical panel side with respect to the viewing angle limiting layer. According to this, since the heat generating layer is disposed on the electro-optical panel side with respect to the viewing angle limiting layer, heat loss can be reduced, and heat generated from the heat generating layer is efficiently transmitted to the electro-optical panel. be able to.

  In the present invention, it is preferable that the heat generating layer has a pattern shape that overlaps the viewing angle limiting layer in a planar manner. According to this, the driving region of the electro-optical panel can be efficiently and uniformly heated by the heat generating layer having a pattern shape that overlaps the viewing angle limiting layer in a planar manner.

  In this case, it is preferable that the heat generating layer has a transparent conductor. According to this, since the heat generating layer includes the transparent conductor and the transparent conductor transmits light, the planar shape of the heat generating layer can be arbitrarily set.

  In the present invention, it is preferable that the light modulation structure has a configuration in which light absorbing materials and light transmitting materials are alternately arranged. By providing such a viewing angle limiting layer and inclining it in the thickness direction at an arbitrary angle, it is possible to arbitrarily limit the visual recognition range of the display or prevent unnecessary reflection.

  In the present invention, it is preferable that the heat generating layer has a pattern shape having a formed portion that overlaps the light absorbing material in a plane and a non-formed portion that overlaps the light transmissive material in a plane. According to this, the heat-generating layer is formed in a range that overlaps the light absorbing material in a plane, and has a portion that is not formed in a range that overlaps the light-transmitting material in a plane, whereby the light transmittance by the heat-generating layer. Can be suppressed. In addition, even if the heat generating layer is not formed with a transparent conductor, it is possible to secure a region for forming the heat generating layer while reducing the influence on the viewing angle limiting layer. Therefore, any material including a material that does not have light transmittance can be used for the heat generating layer.

  In this case, it is preferable that the heat generating layer is formed in a range overlapping with the light absorbing material in a range overlapping at least with the driving region of the electro-optical panel. In this case, a decrease in light transmittance due to the heat generation layer can be almost eliminated.

  In the present invention, it is preferable that the viewing angle limiting layer has a configuration in which a light absorbing material and a light transmitting material are alternately arranged, and the light absorbing material constitutes at least a part of the heat generating layer. According to this, since the light absorbing material constitutes at least a part of the heat generation layer, it is possible to suppress a decrease in transmittance due to the heat generation layer, and at least a part of the heat generation layer is constituted by the viewing angle limiting layer. Accordingly, the optical sheet can be thinned and the structure can be simplified. Here, carbon or the like can be used as a light absorbing material capable of constituting at least a part of the heat generating layer.

  According to another aspect of the invention, there is provided an electronic apparatus including the electro-optical device according to any one of the above and a control unit that controls the electro-optical device. Examples of the electronic apparatus equipped with the electro-optical device include a portable information terminal, an electronic timepiece, and the like in addition to a computer device and a mobile phone which will be described later.

[First Embodiment]
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1A is a schematic longitudinal sectional view schematically showing the structure of the optical sheet 120 of the first embodiment, and FIG. 1B is a schematic plan perspective view.

  The optical sheet 120 is configured as an integral sheet as a whole. The optical sheet 120 includes a transparent substrate 121 made of a synthetic resin film or the like, a heat generating layer 122 formed on the substrate 121, and a light absorbing material 124a and a light transmitting material disposed on the heat generating layer 122. A viewing angle limiting layer 124 in which 124t are alternately arranged in a planar direction and a substrate 126 made of a synthetic resin film or the like that supports the viewing angle limiting layer 124 are overlapped in a planar manner and integrally formed. It will be.

  Specifically, a transparent adhesive layer 123 is interposed between the substrate 121 and the heat generating layer 122 and the viewing angle limiting layer 124, and the heat generating structure and the viewing angle formed by the heat generating layer 122 by the adhesive layer 123. The limiting layer 124 is integrated. The viewing angle limiting layer 124 is bonded to the substrate 126 through a transparent adhesive layer 125. The adhesive layers 123 and 125 may be any layer as long as it has light permeability and adhesiveness. For example, an acrylic adhesive or an epoxy adhesive can be used. In addition, it is preferable that the adhesive layers 123 and 125 have substantially the same refractive index as that of the substrates 121 and 126 or the light transmitting material 124t in order to reduce interface reflection.

  In the present embodiment, the heat generating layer 122 is made of a transparent conductor such as ITO (Indium Tin Oxide), and is configured to cover all the drive region 130A of the electro-optical panel 130 described later. In the case of the illustrated example, the heat generating layer 122 is configured to cover the entire drive region 130A, and further configured to cover the entire viewing angle limiting layer 124 that extends outward from the drive region 130A. In this manner, the electro-optic panel 130 can be heated more uniformly and stably by forming the heat generating layer 122 in a wider range than the drive region 130A and the viewing angle limiting layer 124.

  Terminal portions 122a and 122b are formed at both ends of the heat generating layer 122, and these terminal portions 122a and 122b have surface conductive properties such as a gold plating layer and a silver paste layer in order to improve conductive contact properties (reduce contact resistance). Preferably it is covered with a layer. In addition, since there is no functional problem even if light is shielded in a portion other than the range that overlaps the viewing angle limiting layer 124 or the range that overlaps the drive region 130A, a conductive material is added to the heat generating layer 122. A conductive layer formed of (for example, a metal material such as Au, Ag, Cu, or Al) may be stacked, or a pattern may be formed using only the conductive layer. As a result, the electrical resistance of the entire heat generating layer 122 can be reduced, and the electrical resistance of a portion other than the range overlapping the viewing angle limiting layer 124 or the range overlapping the driving region 130A can be reduced. Since the heat generation can be generated intensively in the range overlapping the viewing angle limiting layer 124 or overlapping the driving region 130A, the electro-optical panel 130 can be heated more quickly and efficiently. .

  In the viewing angle limiting layer 124, examples of the light absorbing material 124a include various coloring materials such as black, red, and blue such as pigments such as iron oxide and carbon black, and dyes such as aniline black. The light transmitting material 124t includes transparent resins such as polyethylene, polypropylene, and silicone rubber. The width of the light absorbing material 124a is preferably set so as not to be visually recognized. For example, the width of the light absorbing material 124a is preferably about 1 to 100 μm, particularly about 5 to 30 μm. The formation period of the light absorbing material 124a is preferably 50 to 300 μm, particularly preferably about 100 to 200 μm. Further, the thickness of the viewing angle limiting layer 124 is preferably about 0.1 to 0.5 mm in consideration of handling properties.

  In the viewing angle limiting layer 124, the light absorbing material 124a is arranged in a posture extending in the thickness direction. The light absorbing material 124a may be arranged in a posture parallel to the thickness direction of the layer, but may be arranged in a posture inclined with respect to the thickness direction as required as in the illustrated example. The posture of the light absorbing material 124 a can be appropriately set according to the viewing angle restriction range of the viewing angle restriction layer 124. A typical inclination angle (angle with respect to the thickness direction) is 30 to 60 degrees. In the present embodiment, the viewing angle limiting layer 124 is configured in a stripe shape in which the light absorbing material 124a extends in a direction perpendicular to the paper surface of FIG. 1 and the plurality of light absorbing materials 124a extend in parallel as a whole. For example, the viewing angle limiting layer 124 is formed by alternately stacking layers formed of the light absorbing material 124a and layers formed of the light transmitting material 124t to form a block body, and slicing the block body. Can be formed.

  The viewing angle limiting layer of the present invention is not limited to such a structure, and the light absorbing material when viewed in a predetermined plane direction so that the viewing angle (light emission angle) can be limited to a desired range. As long as the light transmitting material and the light transmitting material are alternately arranged, any structure may be used. In addition, the light modulation structure of the present invention is not limited to the alternating arrangement structure of the light absorbing material and the light transmitting material such as the viewing angle limiting layer described above, and the light modulation structure of the present invention can impart some light directivity to the transmitted light. If it is. For example, a light condensing structure having a periodic prism structure, a light deflecting structure for uniformly deflecting (refracting) incident light, or the like may be used.

  FIG. 2 is a schematic configuration diagram schematically illustrating the overall configuration of the electro-optical device 100 according to the present embodiment. The electro-optical device 100 has a structure in which the illumination device 110, the optical sheet 120, and the electro-optical panel 130 are stacked in this order in a plane.

  The illumination device 110 is a so-called backlight, and is a planar light source that can illuminate the entire drive region 130A of the electro-optical panel 130. The illumination device 110 includes a light source 111 such as an LED or a cold cathode tube, a light guide plate 112 that receives light emitted from the light source 111 from the light incident surface 112a and emits the light from the light emitting surface 112b while propagating through the light incident surface 112a. A reflection plate 113 made of white polyethylene or the like disposed behind the light plate 112 and a diffusion plate 114 disposed in front of the light exit surface 112b of the light guide plate 112 are provided. In the case of the illustrated example, the light incident surface 112 a is the end surface of the light guide plate 112, and a side light type backlight in which the light source 111 is disposed on the side of the light guide plate 112 is configured. In addition, by arranging a light collecting plate such as a prism sheet (not shown) in front of the diffusion plate 114, the light use efficiency of the lighting device 110 can be improved and a bright display can be realized.

  In the present embodiment, the electro-optical panel 130 is a liquid crystal in which transparent substrates 131 and 132 made of glass, plastic, or the like are bonded together with a sealing material 133 or the like, and a liquid crystal 134 that is an electro-optical material is sealed inside. It is a panel. An electrode 131a made of a transparent conductor such as ITO is formed on the inner surface of the substrate 131, and an electrode 132a made of the same transparent conductor is formed on the inner surface of the substrate 132. In addition, a drive circuit 137 is conductively connected to these electrodes 131a and 132a through wiring. The drive circuit 137 forms a drive potential based on an input signal supplied from a display control circuit 142 described later. A predetermined voltage is applied between the electrodes 131a and 132a by the driving potential supplied from the driving circuit 137, and the alignment state of the liquid crystal 134 is controlled by the voltage. Here, a region where the electrodes 131a and 132a intersect in a plane is the pixel 130a, and the above-described control of the alignment state is performed independently for each pixel 130a. The area where the pixels 130a are arranged in a predetermined manner is the drive area 130A. In the drive region 130A, the pixels 130a are usually arranged in a matrix form vertically and horizontally.

  The electro-optical panel 130 is provided with a temperature detector 138 such as a thermistor. The temperature detector 138 is for detecting the temperature of the electro-optical panel 130, particularly the temperature of the liquid crystal 134. The response speed of the liquid crystal 134 decreases at a low temperature, and the applied voltage value at which high contrast is obtained changes due to temperature fluctuations. Therefore, the response speed is prevented from being lowered by heating according to the detection temperature of the electro-optical panel 130. In addition, by changing the voltage applied to the liquid crystal 134 in accordance with the detected temperature, good display characteristics can be realized.

  In the present embodiment, the illumination device 110, the optical sheet 120, and the electro-optical panel 130 are disposed so as to overlap each other in a planar manner. More specifically, the entire surface of the drive region 130A of the electro-optical panel 130 overlaps with the light emitting surface 112b in a planar manner, overlaps with the viewing angle limiting layer 124 of the optical sheet 120 in a planar manner, and further the heating layer 122. And are arranged so as to overlap with each other.

  Further, the optical sheet 120 is disposed in contact with the electro-optical panel 130. In other words, the optical sheet 120 and the electro-optical panel 130 are held in contact with each other by a support member such as a case frame (not shown), or directly attached via an adhesive layer or the like. . At this time, the surface of the optical sheet 120 on the side where the heat generating layer 122 is disposed, that is, the substrate 121 in the illustrated example, contacts the electro-optical panel 130. In this way, heat loss can be reduced, and the electro-optical panel 130 can be quickly and efficiently heated by the heat generating layer 122 of the optical sheet 120. In FIG. 2, the optical sheet 120 and the electro-optical device 130 are illustrated as separated from each other, but this is merely a schematic illustration of the entire configuration.

  The electro-optical device 100 according to the present embodiment includes the illumination device 110, the optical sheet 120, and the electro-optical panel 130 described above. It is configured to work. The control system 140 is provided with a central control unit 141 composed of a CPU and a controller. A display control circuit 142, a temperature detection circuit 143, a memory 144, an illumination control circuit 145, and a heat generation control circuit 146 are connected to the central control unit 141.

  The display control circuit 142 is conductively connected to the drive circuit 137 and sends predetermined display data and control signals to the drive circuit 137 based on a command from the central control unit 141. The temperature detection circuit 143 is connected to the temperature detector 138, and sends detected temperature data to the central control unit 141. Further, the memory 144 stores a reference voltage value to be supplied to the heat generating layer 122a, a target temperature value of the electro-optical panel 130, and the like as operation parameters, and stores an applied voltage value that can provide high contrast for each temperature as necessary. .

  The illumination control circuit 145 supplies power to the light source 111 of the illumination device 110 based on a command from the central control unit 141. Further, the heat generation control circuit 146 applies a predetermined voltage V to the heat generation layer 122 via the terminal portions 122a and 122b based on a command from the central control unit 141.

  The central control unit 141 reads necessary operation parameters from the memory 144, controls the heat generation control circuit 146 based on the detected temperature obtained by the temperature detector 138 and the temperature detection circuit 143, and drives the heat generation structure. For example, as shown in the graph of FIG. 6, if the detected temperature is lower than the target temperature Td, the heat generation control circuit 146 applies the voltage V to the heat generation layer 122, and heat is generated by the current flowing through the heat generation layer 122. The electro-optical panel 130 is heated. In the state where power is supplied to the heat generating layer 122, the power supply is stopped when the detected temperature reaches the target temperature Tu (Tu> Td).

  The central control unit 141 changes the control signal sent from the display control circuit 142 to the drive circuit 137 based on the detected temperature, optimizes the voltage value applied to the liquid crystal 134 with respect to the temperature, and provides high contrast. You may comprise so that it may be implement | achieved.

  In the present embodiment, since the heat generating layer 122 and the viewing angle limiting layer 124 are integrally configured (laminated), the number of parts can be reduced and the handling becomes easy, thereby reducing the manufacturing cost. it can. In addition, there is an advantage that thickening can be suppressed while realizing both the viewing angle limiting function and the heating function.

  In the above embodiment, the optical sheet 120 is disposed between the illumination device 110 and the electro-optical panel 130. However, the optical sheet 120 may be disposed on the front side (viewing side) of the electro-optical panel 130. . Even in this case, it is preferable that the optical sheet 120 be disposed in a posture in which the heat generating layer 122 is directed to the electro-optical panel 130 side relative to the viewing angle limiting layer 124.

  The substrates 121 and 126 are provided for protecting the heat generating layer 122 and the viewing angle limiting layer 124 and facilitating handling, and may be omitted. For example, the heat generation layer 122 may be configured to be exposed on the surface of the optical sheet, and the heat generation layer 122 may be directly contacted with the electro-optical device 130 or may be directly attached via an adhesive layer or the like.

  In this embodiment, the illumination device 110 is disposed behind the optical sheet 120 and the electro-optical panel 130. However, external light such as sunlight is introduced from behind or the optical sheet 120 is disposed on the front surface of the electro-optical panel 130. When the electro-optical panel 130 is arranged on the side and has a reflective structure, the illumination device 110 is not necessary.

[Second Embodiment]
FIG. 3A is a schematic longitudinal sectional view showing the structure of the optical sheet 150 of the second embodiment different from the above, and FIG. 3B is a schematic plan perspective view. The optical sheet 150 can be used in place of the optical sheet 120 in the first embodiment. The optical sheet 150 includes the substrate 151, the adhesive layer 153, the viewing angle limiting layer 154 provided with the light absorbing material 154a and the light transmitting material 154t, the adhesive layer 155, and the substrate 156 as in the first embodiment. Therefore, these explanations are omitted.

  In the optical sheet 150, the heat generating layer 152 overlaps with the planar pattern of the light absorbing material 154a of the viewing angle limiting layer 154, and has a pattern shape including a non-formed portion that planarly overlaps the light transmitting layer 154t. Different from the embodiment. More specifically, a plurality of strip-shaped energization pattern portions 152c extending overlapping with the plurality of light absorbing materials 154a are peripheral portions (regions outside the drive region 130A) via the wiring pattern portions 152d and 152e, respectively. , 152b. In particular, at least within a range that overlaps the driving region 130A of the electro-optical panel 130 in a plane, the heat generation layer 152 (the energization pattern portion 152c) is configured to exist only in a range that overlaps the light absorber 154a. As a result, almost no light is blocked by the heat generating layer 152. Even if the heat generating layer 152 is made of a light shielding material such as Cu instead of a transparent conductor, the light use efficiency is reduced and the display becomes dark. Hardly occurs.

  In the present embodiment, the heat generating layer 152 is made of a light shielding material, but may be made of a transparent conductor. Even when the heat generating layer 122 is formed of a transparent conductor as in the first embodiment, the light transmittance is reduced by several percent to 10%. Therefore, even when the heat generating layer 152 is formed of a transparent conductor, the heat generating layer 152 is not formed. The significance of the pattern shape as described above is significant.

  However, when the heat generating layer 152 is formed of a transparent conductor, the heat generating layer 152 can be formed only by a limited method such as vapor deposition or sputtering, but the heat generating layer 152 is formed of a light shielding material as in this embodiment. If possible, various forming methods such as printing and bonding can be adopted, and it is possible to select an inexpensive and highly productive manufacturing method, thereby reducing the manufacturing cost. Can be planned. For example, the heat generating layer 152 can be formed very easily by a printing method using a silver paste. In addition, since the optical characteristics of the material of the heat generating layer 152 are not restricted, a material having high electrical conductivity (for example, a metal material having an electrical conductivity approximately two digits higher than that of ITO) can be used. There is also an advantage that the degree of freedom of the planar shape itself is increased. Furthermore, since the heat generating layer 152 (particularly the passage pattern portion 152c) can be configured with such a low resistance material such as a metal material, the variation in resistance can be suppressed, so that the in-plane uniformity of the temperature distribution can be improved. There are also advantages.

  Also in this embodiment, by thickening the terminal portions 152a and 152b and the wiring pattern portions 152d and 152e other than the energization pattern portion 152c, by using a conductive material of another material, or by laminating a conductive layer, The electro-optical panel 130 can be efficiently heated as in the above embodiment.

[Third Embodiment]
FIG. 4A is a schematic longitudinal sectional view showing the structure of the optical sheet 160 of the third embodiment different from the above, and FIG. 4B is a schematic plan perspective view. The optical sheet 160 can be used in place of the optical sheet 120 in the first embodiment. The optical sheet 160 includes the substrate 161, the adhesive layer 163, the viewing angle limiting layer 164 including the light absorbing material 164a and the light transmitting material 164t, the adhesive layer 165, and the substrate 166 as in the first embodiment. Therefore, these explanations are omitted.

  The optical sheet 160 differs from the previous embodiments in that the heat generation structure includes a part of the viewing angle limiting layer 164, that is, the light absorbing material 164a. In the present embodiment, the light absorbing material 164a of the viewing angle limiting layer 164 is made of a conductor such as carbon, and the light absorbing material 164a is formed as at least a part of the heat generating structure (heat generating body). Surface pattern portions 162d and 162e electrically connected to the light absorbing material 164a are formed on the front and back surfaces of the viewing angle limiting layer 164, respectively, and these surface pattern portions 162d and 162e are electrically connected to the terminal portions 162a and 162b. ing. The surface pattern portions 162d and 162e are formed over the entire range that overlaps at least the driving region 130A.

  However, the surface pattern portions 162d and 162e have a pattern shape having a non-formation portion that overlaps with the light absorbing material 164a in a plane and that overlaps with the light transmission material 164t in the same manner as in the second embodiment. In particular, it is more desirable that the surface pattern portions 162d and 162e are formed only in a range overlapping with the light absorbing material 164a in a range overlapping with the driving region 130A in a plane.

  In the present embodiment, by using the light absorbing material 164a as a heating element, the heating structure can be formed using the viewing angle limiting structure, so that the optical sheet 160 can be thinned and the structure can be simplified. In the present embodiment, the light absorbing material 164a can be configured to mainly generate heat, but the surface pattern portions 162d and 162e can be configured to generate effective heat similarly to the light absorbing material 164a. .

[Fourth Embodiment]
FIG. 5A is a schematic longitudinal sectional view showing the structure of an optical sheet 170 according to a fourth embodiment different from the above, and FIG. 5B is a schematic plan perspective view. This optical sheet 170 can be used in place of the optical sheet 120 in the first embodiment. The optical sheet 170 includes a substrate 171, an adhesive layer 173, a viewing angle limiting layer 174 provided with a light absorbing material 174 a and a light transmitting material 174 t, an adhesive layer 175, and a substrate 176 as in the third embodiment. Therefore, these explanations are omitted.

  In the heat generating layer of the optical sheet 170, the wiring pattern portions 172d and 172e are conductively connected to both ends of the light absorbing material 174a, and the wiring pattern portions 172d and 172e are conductively connected to the terminal portions 172a and 172b, respectively. This is different from the third embodiment. Since these wiring pattern portions 17d and 172e are arranged in a portion outside the range that overlaps the driving region 130A in a plan view, even if it is made of a light shielding material, it does not affect the optical characteristics of the sheet. Absent. Accordingly, it is possible to prevent the light transmittance from being lowered, and the wiring pattern portion can be made of a light shielding material such as metal, so that the resistance of the heat generating layer can be reduced and an efficient heat generating mode can be realized. .

[Electronics]
Finally, the case where the electro-optical device according to each of the above-described embodiments is mounted on an electronic apparatus will be described. FIG. 7 shows a notebook personal computer which is an embodiment of the electronic apparatus according to the present invention. The personal computer 200 includes a main body unit 201 including a plurality of operation buttons 201a and other operation devices 201b, and a display unit 202 connected to the main body unit 201 and including a display screen 202a. In the case of the illustrated example, the main body unit 201 and the display unit 202 are configured to be openable and closable. The above-described electro-optical device (liquid crystal device) 100 is built in the display unit 202, and a desired display image is displayed on the display screen 202a. In this case, a display control system for controlling the electro-optical device 100 is provided inside the personal computer 200. The display control system is configured to send an image signal and other input data and a predetermined control signal to the control system provided in the electro-optical device 100 to determine the operation mode. Note that this display control system may be configured by the central control unit 141.

  FIG. 8 shows a mobile phone which is another embodiment of the electronic apparatus according to the present invention. A cellular phone 300 shown here includes an operation unit 301 including a plurality of operation buttons 301a and 301b and a mouthpiece, and a display unit 302 including a display screen 302a and a mouthpiece. The electro-optical device 100 is incorporated inside. The display image formed by the electro-optical device 100 can be viewed on the display screen 302a of the display unit 302. In this case, a display control system for controlling the electro-optical device 100 is provided inside the mobile phone 300. The display control system is configured to send an image signal and other input data and a predetermined control signal to the control system provided in the electro-optical device 100 to determine the operation mode. Note that this display control system may be configured by the central control unit 141.

  In addition to the electronic devices shown in FIGS. 7 and 8, examples of the electronic device according to the present invention include a liquid crystal television, a car navigation device, a pager, an electronic notebook, a calculator, a workstation, a video phone, and a POS terminal. It is done. The electro-optical device according to the present invention can be used as a display unit of these various electronic devices.

  Further, the present invention is not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention. For example, the electro-optical device according to the present embodiment has been described as a liquid crystal display device including a transmissive liquid crystal display panel. However, the present invention is not limited to a transflective type as long as it includes an optical sheet. Or a reflective display panel, or a projection display device using an electro-optical panel as an optical shutter instead of the display panel. Furthermore, not only the liquid crystal device but also other electro-optical devices such as an electrophoretic display device may be used.

The longitudinal cross-sectional view (a) and plane perspective view (b) which show the structure of the optical sheet of 1st Embodiment. 1 is a schematic configuration diagram schematically illustrating an overall configuration of an electro-optical device according to a first embodiment. The longitudinal cross-sectional view (a) and plane perspective view (b) which show the structure of the optical sheet of 2nd Embodiment. The longitudinal cross-sectional view (a) and plane perspective view (b) which show the structure of the optical sheet of 3rd Embodiment. The longitudinal cross-sectional view (a) and plane perspective view (b) which show the structure of the optical sheet of 4th Embodiment. The longitudinal cross-sectional view (a) and plane perspective view (b) which show the structure of the optical sheet of 5th Embodiment. The schematic perspective view of an electronic device. The schematic perspective view of a different electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Electro-optical device, 110 ... Illuminating device, 120 ... Optical sheet, 121 ... Substrate, 122 ... Heat generating layer, 123 ... Adhesive layer, 124 ... Viewing angle limiting layer, 125 ... Adhesive layer, 126 ... Substrate, 130 ... Electro-optical Panel, 137 ... Drive circuit, 138 ... Temperature detector, 130A ... Drive area, 140 ... Control system, 141 ... Central control unit, 142 ... Display control circuit, 143 ... Temperature detection circuit, 144 ... Memory, 145 ... Lighting control circuit 146 ... Heat generation control circuit

Claims (9)

An electro-optic panel in which an electro-optic material is disposed between the substrates;
An optical sheet integrally provided with a viewing angle limiting layer and a heat generation layer that emits directivity by directing incident light; and
An electro-optical device, wherein the electro-optical panel and the optical sheet are arranged so as to overlap in a plane and are in contact with each other.   2. The electro-optical device according to claim 1, wherein the optical sheet includes the heat generating layer closer to the electro-optical panel than the viewing angle limiting layer.   The electro-optical device according to claim 1, wherein the heat generating layer has a pattern shape that overlaps the viewing angle limiting layer in a planar manner.   The electro-optical device according to claim 3, wherein the heat generating layer includes a transparent conductor.   5. The electro-optical device according to claim 1, wherein the viewing angle limiting layer has a configuration in which a light absorbing material and a light transmitting material are alternately arranged.   The said heat generating layer is equipped with the pattern shape which has the formation part which overlaps with the said light absorption material planarly, and the non-formation part which overlaps with the said light transmissive material planarly. Electro-optic device.   The electro-optic according to claim 6, wherein the heat generating layer is formed in a range overlapping with the light absorbing material in a range overlapping at least with a driving region of the electro-optical panel. apparatus.   The said viewing angle restriction | limiting layer is equipped with the structure which has arrange | positioned the light absorption material and the light transmissive material alternately, and the said light absorption material comprises at least one part of the said heat_generation | fever layer, The Claim 1 or 2 characterized by the above-mentioned. Electro-optic device. An electronic apparatus comprising: the electro-optical device according to claim 1; and a control unit that controls the electro-optical device.

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