JP4337777B2 - Electro-optical device and projection display device - Google Patents

Description

  The present invention relates to an electro-optical device such as a liquid crystal device and an EL (Electro-Luminescence) device, and a projection display device using the electro-optical device as a light modulation device. More specifically, the present invention relates to the structure of an electro-optical device.

  For example, the electro-optical device includes an electro-optical material such as liquid crystal sandwiched between an element substrate such as a TFT array substrate and a cover glass (or a counter substrate). In addition, on the outside of the substrate (the surface opposite to the side facing the liquid crystal etc.), a microlens array plate for improving the light utilization efficiency and displaying a bright image, and for protecting the substrate from dust and dirt Plates such as a dust-proof glass plate, a heat-dissipating glass plate to suppress the temperature rise of the electro-optical device, and a defocusing glass plate to reduce the detrimental effects on the display image due to dust and shadows on the substrate surface The member is affixed with an adhesive. For example, Japanese Patent Application Laid-Open Nos. 60-165621 to 165624, and Japanese Patent Application Laid-Open No. 5-196926 disclose liquid crystal devices in which microlenses for improving the utilization efficiency of incident light are formed on a counter substrate. ing. Japanese Patent Application Laid-Open No. 9-113906 discloses a liquid crystal device in which a transparent glass plate having a heat radiation function and a defocus function is arranged on one or both outer surfaces of a substrate of the liquid crystal device.

  Among these electro-optical devices, for example, in the electro-optical device shown in FIG. 9, adhesion from the image display region 10 a where image display is performed with display light to the frame region 2 that defines the outer peripheral edge of the image display region 10 a. The counter substrate 20 (plate member) in which the microlens 500 is formed in the region is bonded to the cover glass 200 (first substrate) by the adhesive 210, and the cover glass 200 and the TFT array substrate 10 (second substrate). In the panel 5 bonded together, the liquid crystal layer 50 is sandwiched between the cover glass 200 and the TFT array substrate 10.

  Here, the panel 5 is housed in a light-shielding case 300 ′ such as plastic. In this case 300 ′, an incident side frame portion 310 ′ and an emission side frame portion 320 ′ are formed on the light incident side and the light exit side of the panel 5, respectively. In the conventional electro-optical device, the incident side frame portion 310 ′ is formed. The inner peripheral edge 315 ′ is located on the inner side of the inner peripheral edge 325 ′ of the emission side frame portion 320 ′. For this reason, the light incident on the panel 5 is limited by the inner peripheral edge 315 ′ of the incident side frame portion 310 ′. Therefore, the display light is transmitted or reflected by the inner peripheral edge 315 ′ of the incident side frame portion 310 ′. The outer peripheral edge of the image display area 10a (that is, the inner peripheral edge of the frame area 2) is defined.

  However, while the conventional electro-optical device is used as a light modulation device (light valve) of a projection display device (projector), the image display region 10a in the vicinity of the frame region 2 has an inner peripheral edge of the frame region 2. There is a problem that a contrast abnormality occurs along the line. Specifically, for example, a whitish region is generated along the frame during black display, and a discontinuous surface can be seen with abnormal contrast.

  In particular, in a device that transmits relatively strong light, such as a liquid crystal device for a projection display device, such deterioration over time is remarkable. According to further research by the inventors of the present invention, color In the case of the liquid crystal device for the light valve of the projector of FIG. 5, such deterioration with time is caused in the electro-optical device for B among the three liquid crystal devices for R (red), G (green), and B (blue). It has been found that it is most prominent. Such a defect appears as an abnormal contrast after, for example, several hundred hours of use. Therefore, such a problem is a very serious problem in practice in a projection display device that requires a lifetime of at least several thousand hours.

  The present invention has been made in view of the above-described problems, and even with a configuration in which a plate-like member is bonded with an adhesive, it is possible to reduce deterioration of image quality over time that occurs in the vicinity of the frame area of the image display area. An object is to provide an electro-optical device and a projection display device.

  In order to solve the above-mentioned problems, the inventor of the present application has made various studies on the temporal deterioration of the image quality that occurs in the vicinity of the frame area of the image display area, and has obtained new knowledge described below. That is, when a plate-like member such as a microlens array plate is bonded to a substrate with a photo-curable adhesive, when strong display light is transmitted through the image display area as in a light modulation device of a projection display device, It has been found that the adhesive causes deformation over time such as sink marks (thinning deformation). Regardless, in the light-shielding case that houses the panel, if the inner peripheral edge of the incident side frame portion of the case is located inside the inner peripheral edge of the output side frame portion, the light incident on the panel is incident on the incident side. The adhesive located in the image display region is irradiated through the inside of the frame, but no light is irradiated to the adhesive in the frame region covered with the incident side frame. For this reason, the adhesive in the image display area contracts, but the adhesive in the frame area does not contract. For this reason, a difference in deformation occurs between the adhesive in the image display region and the adhesive in the frame region, and due to this difference, structural stress concentration occurs near the boundary between these two regions. . As a result, it is considered that the first substrate or the plate-like member is deformed with time, and eventually the image quality in the vicinity thereof is deteriorated with time (contrast abnormality increases with time).

Based on such new knowledge, the present invention provides a plate-like member made of an adhesive in an adhesive region that extends from an image display region where an image is displayed by display light to a frame region that defines the outer periphery of the image display region. A panel having a bonded first substrate, a light shielding film formed outside the image display area of the panel, and a light-shielding incident disposed outside the image display area on the light incident side of the panel A side frame portion and a light-shielding emission side frame portion arranged outside the image display area on the light emission side of the panel, and the plate-like member is arranged on the light incident side of the panel. The first substrate is bonded to the light emitting side of the plate-like member through the adhesive, and the light shielding film is opposite to the surface of the first substrate bonded to the plate-like member. Formed on the side surface, and the incident side frame portion and the emission side frame portion At least partially overlap each
An inner peripheral edge of the emission side frame portion is positioned on an inner peripheral side with respect to an inner peripheral edge of the incident side frame portion, and the incident side frame portion is disposed to face the panel via a predetermined gap. It is characterized by being.
Based on such new knowledge, the present invention provides a plate-like member made of an adhesive in an adhesive region that extends from an image display region where an image is displayed by display light to a frame region that defines the outer periphery of the image display region. A panel having a bonded first substrate; and an incident side frame portion disposed on a light incident side of the panel, wherein the incident side frame portion is between the incident side frame portion and the panel. It is arranged so as to face the panel through a predetermined gap so that the incident light reaches the depth of the frame area.

  In the present invention, of the incident side frame portion and the emission side frame portion formed on the incident side and the emission side of the panel, the inner peripheral edge of the emission side frame portion is located on the inner peripheral side with respect to the inner peripheral edge of the incident side frame portion. is doing. Therefore, when light is incident on the image display area through the inside of the incident side frame portion, this light is applied to the adhesive in the image display area and applied to a region slightly closer to the image display region than in the frame region. Reach even glue. Therefore, the phenomenon in which the adhesive that has been irradiated with light undergoes deformation with time such as sink (thinning deformation) also occurs in the adhesive in the image display area, but is positioned slightly in the frame area rather than the image display area. The same happens with adhesives. For this reason, there is no difference in the amount of deformation between the adhesive in the image display area and the adhesive located in the frame area slightly closer to the image display area, so in the vicinity of the boundary between these two areas. There is no structural stress concentration. As a result, since the first substrate or the plate-like member does not deform with time, the image quality does not deteriorate with time in this boundary region.

  Here, it is conceivable that the above-mentioned problems can be solved by using an adhesive that hardly changes in quality with respect to light or hardly changes with time. However, as an adhesive for bonding a plate-like member to a substrate such as a cover glass, from the viewpoint of causing a microlens or the like to function as a lens and from the viewpoint of suppressing the occurrence of stress and deformation during curing inside the apparatus, Is required to have a low refractive index and low stress. However, it is currently difficult to obtain an adhesive that satisfies such a requirement and is not easily deformed by light irradiation. It is. Therefore, the present invention has a great advantage in reality that the material of the adhesive used for bonding the plate-like member may be the same as before.

  In the present invention, the panel includes, for example, a second substrate bonded to the first substrate so as to face the first substrate, and between the second substrate and the first substrate. In this case, the emission side frame portion is disposed on the opposite side of the first substrate with respect to the second substrate.

  In the present invention, the adhesive is, for example, a photocurable adhesive.

  In the present invention, for example, a large number of microlenses are formed on the adhesive surface with the plate-like member on the first substrate side.

  In the present invention, the incident-side frame portion may be configured to face the first substrate side with a predetermined gap. With such a configuration, light entering from the gap between the incident side frame portion and the panel reaches the depth of the frame region. Therefore, the same shrinkage as that of the adhesive in the image display region occurs reliably in the adhesive located in the frame region slightly closer to the image display region. For this reason, structural stress concentration does not occur in the vicinity of the boundary between the image display area and the frame area, so that the first substrate or the plate-like member does not deform with time. Therefore, the image quality does not deteriorate with time in this boundary region.

  In the present invention, the first substrate includes, for example, an electro-optical material sandwiched between the first substrate and the second substrate bonded so as to face the first substrate, and the emission side The frame portion is disposed on the opposite side of the first substrate with respect to the second substrate.

  In the present invention, the adhesive is, for example, a photocurable adhesive.

  In the present invention, for example, a large number of microlenses are formed on an adhesive surface with the plate-like member on the first substrate side.

  In the present invention, the emission side frame portion may be arranged to face the first substrate side via a predetermined gap.

  An electro-optical device to which the present invention is applied includes, for example, a light source, a light guide system that guides light emitted from the light source to a light modulation device, and a projection system that projects light modulated by the light modulation device. In a projection display device, the light modulation device can be used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Overall configuration of electro-optical device)
First, the overall configuration of an electro-optical device to which the present invention is applied will be described with reference to FIGS. Here, a TFT active matrix driving type liquid crystal device with a built-in driving circuit is taken as an example.

  FIG. 1 is a plan view of a TFT array substrate (active matrix substrate) of a liquid crystal device to which the present invention is applied, as viewed from the counter substrate side, together with the components formed thereon. FIG. 2 is a cross-sectional view taken along the line HH ′ of FIG. FIG. 3 is a cross-sectional view schematically showing an enlarged end portion of the liquid crystal device. In FIG. 3, the scales are different for each layer and each member so that each layer and each member have a size that can be recognized on the drawing. In FIG. 3, the arrangement relationship between the microlens and the TFT is different from the actual arrangement relationship in order to make it easier to understand the state of light collection.

  1, 2, and 3, in the liquid crystal device 1 (electro-optical device) of the present embodiment, a TFT array substrate 10 (second substrate) and a counter substrate 20 are disposed to face each other. A large number of microlenses 500 are formed on the lower surface of the counter substrate 20 (the adhesive surface with the cover glass), and the counter substrate 20 is configured as a microlens array plate. A cover glass 200 as a first substrate is bonded to the lower surface of the counter substrate 20 on which the microlens 500 is formed in this way by an adhesive 210. Here, each of the microlenses 500 is formed in a matrix so as to collect incident light on each of the pixel electrodes 9 a formed on the TFT array substrate 10, and a plurality of microlenses 500 are formed on the cover glass 200. A light shielding film 23 is formed at a position facing the boundary between the lenses 00. The pixel electrode 9a is formed of an ITO film (indium tin oxide film). The adhesive 210 is made of an acrylic photocurable adhesive having a refractive index close to air, and the microlens 500 functions as a condensing lens due to the difference in refractive index between the two.

  The sealing material 52 is made of, for example, an ultraviolet curable resin, a thermosetting resin, or the like for attaching the TFT array substrate 10 and the cover glass 200 bonded to the entire surface of the counter substrate 20 to form the panel 5. After being coated on the substrate, it is cured by irradiating with ultraviolet rays, heating or the like in a state where the bonded substrate of the cover glass 200 and the counter substrate 20 is stacked. If the liquid crystal device 1 is as small as a projection display device and performs an enlarged display, a glass fiber for setting a distance between both substrates (a gap between the substrates) to a predetermined value is included in the sealing material 52. Alternatively, a gap material (spacer) such as glass beads is blended. Further, if the liquid crystal device 1 is a large-sized display that displays the same size as a liquid crystal display or a liquid crystal television, such a gap material may be scattered in the liquid crystal layer 50 in some cases.

  In the liquid crystal device 1 of this embodiment, a light shielding film 53 for parting that defines the image display region 10a is formed on the counter substrate 20 side along the region inside the seal region where the seal material 52 is disposed. Yes.

  A data line driving circuit 101 and an external circuit connection terminal 102 are formed along one side of the TFT array substrate 10 in a peripheral region outside the region where the seal material 52 is formed. It is provided along two sides adjacent to one side. Furthermore, a plurality of wirings 105 are formed on the remaining side of the TFT array substrate 10 to connect between the scanning line driving circuits 104 provided on both sides of the image display region 10a. Furthermore, at least one corner of the counter substrate 20 is provided with a vertical conductive material 106 for establishing electrical continuity between the TFT array substrate 10 and the counter substrate 20.

  In FIG. 3, an alignment film 32 made of a polyimide-based material is formed on the surface of the pixel electrode 31 after the pixel switching TFT 30 and the wiring such as the scanning line, the data line, and the capacitor line are formed on the TFT array substrate 10. Is formed. On the cover glass 200, in addition to the counter electrode 21, a light shielding film 23 generally called a black mask or a black matrix that defines a non-opening region for each pixel is formed, and an alignment film 24 is formed on this surface. Is formed. Each of the pair of alignment films 32 and 24 is coated with a polyimide material and baked, and then aligns the liquid crystal in the liquid crystal layer 50 in a predetermined direction and applies a predetermined pretilt angle to the liquid crystal. Is given. The liquid crystal layer 50 is made of, for example, a liquid crystal in which one or several types of nematic liquid crystals are mixed, and takes a predetermined alignment state between the pair of alignment films 32 and 24. The light shielding film 23 has a function of improving the contrast in the display image.

  In the liquid crystal device 1 formed as described above, the counter substrate 20 on which the microlens 500 is formed and the cover glass 200 are bonded regions that extend over both the image display region 10a and the frame region 2 extending around the image display region 10a. As shown in FIG.

  In the liquid crystal device 1 of the present embodiment, in the projection type display device described later, since color light separated into each color is incident, no color filter is formed, but a color filter is formed on the surface of the cover glass 200. In some cases. In this case, the light shielding film 23 also has a function of preventing color mixture of the color materials forming the color filter. Instead of the light shielding film 23 or in addition to the light shielding film 23, the light shielding film 11 a may be formed on the TFT array substrate 10.

(Configuration of the pixel portion of the liquid crystal device)
The pixel portion of the liquid crystal device 1 of the present embodiment will be described with reference to FIGS. FIG. 4 is an equivalent circuit of various elements, wirings, and the like in a plurality of pixels formed in a matrix that forms the image display region 10 a of the liquid crystal device 1. FIG. 5 is a plan view of a plurality of adjacent pixel groups on the TFT array substrate 10 on which data lines, scanning lines, pixel electrodes, a light shielding film, and the like are formed, and a light shielding film and a microlens formed on the counter substrate 20 side. It is.

  As shown in FIG. 4, in the liquid crystal device 1 of the present embodiment, a plurality of pixels formed in a matrix form that constitutes the image display region 10a has a plurality of TFTs 30 for controlling the pixel electrodes 9a formed in a matrix form. The data line 6 a to which the pixel signal is supplied is electrically connected to the source of the TFT 30. The image signals S1, S2,..., Sn to be written to the data lines 6a may be supplied in this order, and may be supplied for each group to a plurality of adjacent data lines 6a. Also good. Further, the scanning line 3a is electrically connected to the gate of the TFT 30, and the scanning signals G1, G2,..., Gm are applied to the scanning line 3a in a pulse-sequential manner in this order at a predetermined timing. It is configured. The pixel electrode 9a is electrically connected to the drain of the TFT 30, and the image signal S1, S2,..., Sn supplied from the data line 6a is obtained by closing the switch of the TFT 30 as a switching element for a certain period. Write at a predetermined timing. Image signals S1, S2,..., Sn written at a predetermined level on the liquid crystal via the pixel signal 9a are held for a certain period with the counter electrode formed on the counter substrate. The liquid crystal modulates light by changing the orientation and order of the molecular assembly according to the applied voltage level, thereby enabling gradation display. In the normally white mode, incident light cannot pass through the liquid crystal part according to the applied voltage. In the normally black mode, incident light passes through the liquid crystal part according to the applied voltage. Light that has a contrast corresponding to the image signal is emitted from the electro-optical device as a whole. Here, in order to prevent the held image signal from leaking, a storage capacitor 70 is added in parallel with the liquid crystal capacitor formed between the pixel electrode 9a and the counter electrode.

  In FIG. 5, on the TFT array substrate 30 of the liquid crystal device 1, a plurality of transparent pixel electrodes 9a (outlined by dotted lines) are provided in a matrix, and the vertical and horizontal boundaries of the pixel electrodes 9a are provided. A data line 6a, a scanning line 3a, and a capacitor line 3b are provided along each. A TFT 30 is provided substantially corresponding to each intersection of these wirings. In FIG. 5, each data line 6 a extending in the vertical direction is electrically connected to the source region of the TFT 30 in the semiconductor layer 1 a made of a polysilicon film or the like via the contact hole 5. The pixel electrode 9 a is electrically connected to the drain region of the TFT 30 in the semiconductor layer 1 a through the contact hole 8. In FIG. 5, each scanning line 3a extending in the left-right direction is disposed so as to face the channel region 1a '(the hatched region in the lower right in the drawing) of the semiconductor layer 1a. Functions as the gate electrode of the TFT 30.

  The capacitor line 3b has a main line portion extending substantially linearly along the scanning line 3a, and a protruding portion protruding upward in the figure along the data line 6a from a location intersecting the data line 6a. The semiconductor layer 1a extends from the TFT 30 along the capacitor line 3b as a storage capacitor electrode 1f, and the storage capacitor electrode 1f and the capacitor line 3b pass through an insulator (gate insulating film) as a dielectric. Thus, a storage capacitor is formed.

  Further, in a region extending in the left-right direction along the scanning line 3a and the capacitance line 3b, a light shielding film 11a including a plurality of striped portions is provided. The light shielding film 11a covers the TFT 30 including the channel region 1a ′ of the semiconductor layer 1a from the TFT array substrate 10 side. If the light shielding film 11a is also provided on the lower side of the TFT 30 as described above, one optical system is configured by combining back surface reflection (return light) and a plurality of liquid crystal devices 1 via a prism or the like from the TFT array substrate 10 side. In this case, it is possible to prevent the light that penetrates the prism or the like from the other liquid crystal device 1 from entering the TFT 30 of the liquid crystal device 1 in advance.

  In FIG. 5, on the side of the counter substrate 20, the microlens ends 500a of the plurality of microlenses 500 formed so as to face the pixel electrodes 11a and the side of the counter substrate 20 (cover glass 200). 5 also shows a light shielding film 23 (indicated by a slanting line in the upward direction in the drawing) formed so as to correspond to each of the microlens ends 500a.

(Manufacturing method of the micro lens 500)
Next, an example of a method for manufacturing the microlens 500 will be described with reference to FIG.

  To manufacture the microlens 500, first, as shown in FIG. 6A, a resist layer 711 having photosensitivity and heat deformability is formed on the counter substrate 20. Next, as shown in FIG. 6B, a mask layer 610 having a positive image of a region to be edged on the counter substrate 20 is aligned so as to overlap the resist layer 711, and the mask layer 610 is interposed therebetween. The resist layer 711 is exposed by irradiating with ultraviolet rays. Next, as shown in FIG. 6C, the exposed mask layer 610 is developed to remove the exposed portion. As a result, the resist layer 711 remains in the portion where the microlens 500 is formed, and the heating process is performed in the state shown in FIG. As a result, the resist layer 711 is softened and the corner portions of the resist layer 711 are rounded as shown in FIG. Next, as shown in FIG. 6E, the microlens 500 is formed on the surface of the substrate 20 by performing dry etching from the surface where the resist layer 711 is arranged in a matrix as a convex surface. Next, as shown in FIG. 6F, a photo-curable adhesive 210 is applied to the surface of the microlens 500 and a cover glass 200 made of neo-ceram or the like is pressed and bonded. Finally, as shown in FIG. 6G, a light shielding film 23, a counter electrode 21 and an alignment film 24 are formed in this order on the cover glass 200 by sputtering, coating, etc., and are shown in FIGS. The counter substrate 20 with the cover glass 200 is completed.

(Measures to improve display quality)
The liquid crystal device 1 formed in this way is housed in a light-shielding case 300 made of plastic or the like, as shown in FIGS. The case 300 includes a rectangular incident side frame portion 310 disposed on the light incident side of the panel 5, a rectangular emission side frame portion 320 disposed on the light emitting side of the panel, and a side surface portion of the panel 5. A side surface portion 330 that connects the incident side frame portion 310 and the emission side frame portion 320 is formed with a step shape along the shape. In addition, windows 311 and 321 are formed inside the entrance side frame portion 310 and the exit side frame portion 320, respectively.

  In such a case 300, in this embodiment, the inner peripheral edge 325 of the emission side frame portion 320 is located on the inner peripheral side with respect to the inner peripheral edge 315 of the incident side frame portion 310 to define the inner peripheral edge of the frame region 2. Yes. That is, when viewed from the TFT array substrate 10 side, the outer periphery of the image display region 10a (the inner periphery of the frame region 2) is defined by the inner periphery 325 of the emission side frame 320.

  In the liquid crystal device 1 of this embodiment configured as described above, incident light from the counter substrate 20 side is incident on the plurality of pixel electrodes 9a by the plurality of microlenses 500 provided between the counter substrate 20 and the cover glass 200. Respectively. Therefore, the effective aperture ratio in each pixel is increased as compared with the case without the microlens 500. Further, since the incident light from the counter substrate 20 side is condensed on the pixel electrode 9a by the microlens 500, the utilization efficiency of the incident light is high.

  In the liquid crystal device 1 according to the present embodiment, the inner peripheral edge 325 of the exit side frame portion 320 of the entrance side frame portion 310 and the exit side frame portion 320 formed on the entrance side and the exit side of the panel 5 is the entrance side frame. The inner periphery of the frame region 2 (the outer periphery of the image display region 10a) is defined by being located on the inner periphery side of the inner periphery 315 of the portion 310. Therefore, when light is incident on the image display area 10a through the inside (window 311) of the incident side frame portion 315, the light is applied to the adhesive 210 located in the image display area 10a and the frame area. 2 also reaches the adhesive 210 that is positioned slightly in the area from the image display area 10a. Therefore, the phenomenon in which the adhesive 210 irradiated with light undergoes deformation with time such as sink marks (thinning deformation) also occurs in the adhesive 210 in the image display area 10a, but in the frame area 2 slightly more than the image display area 10a. The same applies to the adhesive 210 that is positioned at the same position. For this reason, there is no difference in the amount of deformation between the adhesive 210 in the image display area 10a and the adhesive 210 positioned slightly in the frame area 2 from the image display area 10a. There is no structural stress concentration near the boundary of the region. As a result, the cover glass 200 and the counter substrate 20 do not deform with time, so that the image quality does not deteriorate with time in this boundary region.

  Further, the adhesive 210 has a low refractive index and a low refractive index from the viewpoint of causing the counter substrate 20 to function as a lens or suppressing the occurrence of stress and deformation during curing inside the apparatus. Although it is requested | required that it is stress, acquisition of the adhesive agent 210 which has the property which does not change easily with respect to light irradiation while satisfy | filling such a request | requirement is difficult at present. Therefore, in this embodiment, as the adhesive 210 for adhering the cover glass 200 to the counter substrate 20, a conventional inexpensive one can be used.

[Other embodiments]
FIG. 7 is an enlarged cross-sectional view showing the configuration of the liquid crystal device 1 of the present embodiment. In the liquid crystal device 1 of the present embodiment, the configuration of the panel and the like is the same as that of the above-described embodiment. Therefore, common elements are denoted by the same reference numerals, and those reference numerals are added to FIG. The description of is omitted.

  As shown in FIG. 7, also in the liquid crystal device 1 of this embodiment, the panel 5 is accommodated in a light-shielding case 300 made of plastic or the like. Also in this case 300, a rectangular incident side frame portion 310 arranged on the light incident side of the panel, a rectangular emission side frame portion 320 arranged on the light emission side of the panel, and these frame portions 310 are connected to each other. Side surfaces 330 to be connected are formed, and windows 311 and 321 are formed inside the entrance-side frame 310 and the exit-side frame 320, respectively. In this case 300, in this embodiment, the inner peripheral edge 325 of the emission side frame portion 320 is located on the inner peripheral side with respect to the inner peripheral edge 315 of the incident side frame portion 310 to define the inner peripheral edge of the frame region 2.

  Further, in this embodiment, the incident side frame portion 310 is disposed to face the panel via a predetermined gap 318. For this reason, the light that has entered through the gap 318 between the incident side frame portion 310 and the panel reaches the back of the frame region 2. Accordingly, the same shrinkage as that of the adhesive 210 in the image display area 10a occurs surely in the adhesive 210 positioned slightly in the frame area 2 from the image display area 10a. For this reason, structural stress concentration does not occur in the vicinity of the boundary between the image display region 10a and the frame region 2, so that the counter substrate 20 and the cover glass 200 are not deformed over time. Therefore, the image quality does not deteriorate with time in this boundary region.

  In the above embodiment, the example in which the microlens array plate (counter substrate 20) and the cover glass 200 are bonded to each other with the adhesive 210 has been described. However, a dustproof glass plate and an electro-optical device for protecting the substrate from dust and dust. A plate-like member such as a heat-dissipating glass plate for suppressing the temperature rise of the substrate and a defocusing glass plate for reducing adverse effects on the display image due to dust on the substrate surface or shadows of the substrate with the adhesive. The present invention can also be applied to a liquid crystal device having a bonded structure.

(Configuration of projection display device)
With reference to FIG. 8, the structure of the projection type display apparatus using the liquid crystal device 1 to which the present invention is applied will be described.

  In FIG. 8, in the projection display device 1100, the liquid crystal display module including the transmissive liquid crystal device 1 includes light valves 100R, 100G, and 100B for R (red light), G (green light), and B (blue light), respectively. It is used as a (light modulation device).

  In the projection display apparatus 1100, when projection light is emitted from a lamp unit 1102 of a white light source such as a metal halide lamp, this light is guided to the light valves 100R, 100G, and 100B through a light guide system described below. . That is, the projection light from the lamp unit 1102 is divided into light components R, G, and B corresponding to the three primary colors of RGB by the three mirrors 1106 and the two dichroic mirrors 1108, and the light valve 100R corresponding to each color. , 100G, and 100B. At this time, in particular, the B light is guided through a relay lens system 1121 including an incident lens 1122, a relay lens 1123, and an exit lens 1124 in order to prevent light loss due to a long optical path.

  The light components corresponding to the three primary colors modulated by the light valves 100R, 100G and 100B are synthesized again by the dichroic prism 1112 and then enlarged as a color image on the screen 1120 via the projection lens 1114 (projection system). Projected.

  As described above, even when the liquid crystal device 1 to which the present invention is applied is used as a light modulation device (light valve) that transmits relatively strong light, such as the projection display device 1100, the time of display caused by the shrinkage of the adhesive agent. Therefore, it is possible to provide a projection display device 1100 that can perform high-quality display over a long period of time. In particular, among the three liquid crystal devices 1 (light valves) for R (red), G (green), and B (blue), the B liquid crystal device 1 tends to deteriorate with time. Such a problem can be surely solved.

(The invention's effect)
As described above, in the present invention, of the incident side frame portion and the output side frame portion formed on the incident side and the output side of the panel, the inner peripheral edge of the output side frame portion is the inner peripheral edge of the incident side frame portion. The inner peripheral edge of the frame region is defined on the inner peripheral side. Therefore, when light is incident on the image display area through the inside of the incident side frame, this light is applied to the adhesive in the image display area and at a position slightly closer to the image display area than the image display area. Also reaches the adhesive. Therefore, the phenomenon in which the adhesive irradiated with light undergoes deformation over time such as sink (thinning deformation) also occurs in the adhesive in the image display area, but the adhesive located in the frame area slightly beyond the image display area. It also occurs in drugs. For this reason, there is no difference in the amount of deformation between the adhesive in the image display area and the adhesive located in the frame area slightly closer to the image display area, so in the vicinity of the boundary between these two areas. There is no structural stress concentration. As a result, since the first substrate or the plate-like member does not deform with time, the image quality does not deteriorate with time in this boundary region.

It is the top view which looked at the TFT array board | substrate of the liquid crystal device (electro-optical apparatus) to which this invention was applied from the opposing board | substrate side with each component formed on it. It is sectional drawing of HH 'of FIG. It is sectional drawing which expands and shows typically the edge part of the liquid crystal device shown in FIG. 1 is an equivalent circuit of various elements and wirings in a plurality of pixels formed in a matrix in the image display region of the liquid crystal device shown in FIG. FIG. 2 is a plan view of a plurality of adjacent pixel groups of a TFT array substrate of the liquid crystal device shown in FIG. 1 and a light shielding film and a microlens formed on a counter substrate. It is process sectional drawing which shows an example of the method of forming a micro lens in the opposing board | substrate of the liquid crystal device shown in FIG. FIG. 4 is a cross-sectional view schematically showing an enlarged end portion of a liquid crystal device different from the liquid crystal device shown in FIG. 3. It is explanatory drawing which shows the structure of the optical system of the projection type display apparatus using the liquid crystal device to which this invention is applied. It is sectional drawing which expands and shows typically the edge part of the conventional liquid crystal device.

Explanation of symbols

1 Liquid crystal device (electro-optical device)
2 Frame area 5 Panel 10 TFT array substrate (second substrate)
10a Image display area 20 Counter substrate 50 Liquid crystal layer 52 Sealing material 53 Light shielding film 200 for parting off Cover glass 210 Adhesive 300 Light-shielding case 310 Incident side frame 318 Gap between incident side frame and panel 320 Outgoing side frame 500 Microlens 1100 Projection Display Devices 100R, 100G, and 100B Light Valve (Light Modulation Device)

Claims (5)

A panel including a first substrate in which a plate-like member is bonded with an adhesive in an adhesive region extending from an image display region where image display is performed by display light to a frame region defining the outer periphery of the image display region;
A light shielding film formed outside the image display area of the panel;
A light-shielding incident side frame portion disposed outside the image display region on the light incident side of the panel, and a light-shielding light emitting side frame portion disposed outside the image display region on the light exit side of the panel. And having
The plate-like member is disposed on the light incident side of the panel,
The first substrate is bonded to the light emitting side of the plate-like member via the adhesive,
The light-shielding film is formed on a surface opposite to the surface bonded to the plate-like member of the first substrate, and at least a part of each of the incident-side frame portion and the emission-side frame portion overlaps,
The inner peripheral edge of the exit-side frame unit, both when located on the inner circumferential side than the inner peripheral edge of the incident-side frame section,
The electro-optical device, wherein the incident-side frame portion is disposed to face the panel via a predetermined gap. 2. The panel according to claim 1 , wherein the panel is sandwiched between the second substrate bonded to the first substrate so as to face the first substrate, and the second substrate and the first substrate. Liquid crystal, and
The electro-optical device, wherein the emission side frame portion is disposed on the opposite side of the first substrate with respect to the second substrate. According to claim 1 or 2, wherein the adhesive is an electro-optical device which is a photocurable adhesive. In any one of claims 1 to 3, the bonding surface between the first substrate in the plate-like member to an electro-optical device, wherein a plurality of microlenses are formed. Claims 1 A projection type display apparatus using the electro-optical device as defined in any of the 4, light source, a light guide system for guiding the light modulation device comprising a light emitted from the light source from the electro-optical device And a projection system for projecting the light modulated by the light modulation device.

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