JP2015197574A - Electro-optical module and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electro-optical module capable of appropriately providing a heat conduction material such as heat radiation grease across a whole area overlapping with a display area between an electro-optical panel and a heat sink, and further to provide an electronic apparatus.SOLUTION: In an electro-optical module 100, a heat conduction material 6 such as heat radiation grease having flow properties is applied to a heat sink 7 or an electro-optical panel 40 and, subsequently, the heat sink 7 and the electro-optical panel 40 are caused to overlap with each other. In this case, an application amount of the heat conduction material 6 is set to be greater than an amount required to fill a gap G0 between the heat sink 7 and the electro-optical panel 40. The excessive heat conduction material 6 flows into a groove-shaped recess portion 73 formed on the heat sink 7 via a gap G1 between an outer peripheral surface 720 of a protrusion portion 72 and an inner peripheral surface 350 of an opening portion 35 from the gap G0 between the electro-optical panel 40 and the protrusion portion 72 of the heat sink 7.

Description

The present invention relates to an electro-optic module in which an electro-optic panel is provided with a heat sink, and an electronic apparatus including the electro-optic module.

In order to mount an electro-optical panel such as a liquid crystal panel on an electronic device or the like, the electro-optical module is held by a holder. For the electro-optic module, for the purpose of improving the heat dissipation from the electro-optic panel, the back side of the electro-optic panel is opened from the opening of the holder, the heat sink is overlaid on the back side of the electro-optic panel, and the opening A configuration in which the space between the electro-optic panel and the heat sink is filled with heat radiation grease is proposed (see Patent Document 1).

Japanese Patent Application Laid-Open No. H10-228688 proposes that the surface of the heat sink that overlaps the electro-optical panel is provided with a groove over the entire region including the region overlapping the display region in plan view, thereby facilitating spreading of the heat dissipation grease.

JP 2010-256654 A

In order to manufacture the electro-optic module described in Patent Document 1, after applying thermal radiation grease to the heat sink or the electro-optic panel, the heat sink and the electro-optic panel are overlapped. At that time, if the amount of heat radiation grease applied is too small, an area where no heat radiation grease exists between the heat sink and the electro-optical panel is generated. Low. As a result, temperature variations occur in the surface of the electro-optical panel. Such temperature variation is not preferable because it causes a decrease in display performance, reliability, and the like.

On the other hand, if the application amount of the heat dissipation grease is too large, an excessive stress is applied from the heat dissipation grease to the electro-optical panel, and the electro-optical panel may be deformed. Such deformation is not preferable because it causes a decrease in display performance.

As in the technique described in Patent Document 1, if a groove is provided over the entire area including the area overlapping the display area with respect to the heat sink, the heat dissipation grease is likely to spread, but the variation in the application amount of the heat dissipation grease is absorbed. I cannot expect much effect. Conversely, if a groove is provided over the entire area including the area overlapping with the display area, the amount of heat radiation grease is different between the area where the groove is formed and the area where the groove is not formed. Will be different.
As a result, a temperature difference occurs between the region where the groove is formed and the region where the groove is not formed in the surface of the electro-optical panel, and this temperature difference may cause display unevenness.

In view of the above problems, in the present invention, between the electro-optical panel and the heat sink,
An object of the present invention is to provide an electro-optic module in which a heat conductive material such as heat radiation grease can be appropriately provided over the entire area overlapping with a display area, and an electronic apparatus including the electro-optic module.

In order to solve the above-described problems, an electro-optic module according to the present invention includes an electro-optic panel provided with a display region for emitting display light on one side, and the electro-optic panel. A holder having an opening that opens the other surface, a heat sink that faces the other surface of the electro-optical panel, and a fluidity that fills the space between the electro-optical panel and the heat sink inside the opening. And at least one of the heat sink and the holder is formed with a recess communicating between the electro-optic panel and the heat sink outside the region overlapping the display region in plan view. It is characterized by.

In the present invention, since the space between the electro-optical panel and the heat sink is filled with a fluid heat conductive material, heat can be efficiently released from the electro-optical panel to the heat sink via the heat conductive material. In addition, to manufacture an electro-optic module, a fluid heat conductive material is applied to a heat sink or an electro-optical panel, and then the heat sink and the electro-optical panel are stacked. More than the amount needed to fill the gap between the electro-optic panel and the electro-optical panel. For this reason, a region where no heat conductive material exists is not generated between the heat sink and the electro-optical panel. Moreover, even if more heat conductive material is applied than necessary to fill the heat sink and the electro-optic panel, excess heat conductive material flows into the recesses.
For this reason, the space between the heat sink and the electro-optical panel is filled with an appropriate amount of heat conductive material over the entire area. Accordingly, it is possible to avoid a situation in which the electro-optic panel is deformed due to excessive stress applied from the heat conductive material to the electro-optic panel. In addition, since the concave portion is provided outside the region overlapping the display region, the amount of the heat conductive material does not vary in the region overlapping the display region due to the presence or absence of the concave portion. Variations in heat dissipation due to variations in temperature are less likely to occur.

In this invention, it is preferable that the said recessed part is extended along the edge of the said opening part.
According to such a configuration, since the concave portion is present at a relatively close position from between the electro-optical panel and the heat sink, even when the viscosity of the heat conductive material is high, excess heat conductive material smoothly flows into the concave portion.

In the present invention, it is preferable that the concave portion surrounds a portion where the electro-optic panel and the heat sink are opposed to each other inside the opening. According to such a configuration, even when the heat conductive material has a high viscosity, excess heat conductive material smoothly flows into the recesses.

In the present invention, the heat sink includes a convex portion that protrudes into the opening with a larger area in the plan view and faces the other surface of the electro-optic panel, and the concave portion has the convex shape in the plan view. It is preferable to be provided outside the portion. According to this configuration, since the heat sink and the electro-optical panel can be brought close to each other, heat can be efficiently released from the electro-optical panel to the heat sink. In addition, since the concave portion is not formed on the convex portion, a portion where the amount of grease differs between the convex portion and the electro-optical panel due to the presence or absence of the concave portion does not occur.

In the present invention, for example, a configuration in which the recess is formed in a groove shape at a position overlapping the edge of the opening in a plan view in the heat sink can be employed.

In this invention, the said recessed part can employ | adopt the structure currently formed in the notch shape between the said heat sink side surface and the internal peripheral surface of the said opening part in the said holder.

In the present invention, the holder preferably has a smaller thermal expansion coefficient than the heat sink. Even if the heat sink has a large thermal expansion coefficient, the heat sink is in contact with the heat transfer material, so that even if a temperature change occurs, stress is not easily applied from the heat sink to the electro-optical panel. In addition, since the thermal expansion coefficient of the holder is small, it is difficult for stress to be applied from the holder to the electro-optical panel even if a temperature change occurs.

  In the present invention, the heat conductive material is, for example, heat dissipation grease.

In the present invention, the electro-optical panel is, for example, a liquid crystal panel, and the liquid crystal panel includes a first substrate, a second substrate bonded to the first substrate with a sealing material, and the first substrate.
A liquid crystal layer provided in a space surrounded by the sealing material between the substrate and the second substrate, and the other surface of the electro-optical panel is the first substrate of the first substrate. It consists of the surface opposite to the two-substrate side.

The electro-optic module according to the present invention can be used in various electronic devices. When the projection display device is configured as an electronic device, the electronic device includes a light source unit that emits light supplied to the electro-optical panel, and a projection optical system that projects light modulated by the electro-optical panel. ,have. In the case of a projection display device, the result is that strong light is supplied to the electro-optical panel,
Although the temperature rise of the electro-optic module is large, even if such a temperature change occurs, stress is not easily applied to the electro-optic panel according to the present invention.

It is explanatory drawing of the electro-optical panel used for the electro-optical module which concerns on Embodiment 1 of this invention. 1 is a perspective view of an electro-optic module according to Embodiment 1 of the present invention. 1 is an exploded perspective view of an electro-optic module according to Embodiment 1 of the present invention. 1 is a cross-sectional view of an electro-optic module according to Embodiment 1 of the present invention. It is sectional drawing of the electro-optic module which concerns on Embodiment 2 of this invention. It is explanatory drawing, such as a recessed part (escape part of heat conductive material) provided in the electro-optic module which concerns on Embodiment 2 of this invention. It is a schematic block diagram of an example of the projection type display apparatus (electronic device) to which this invention is applied.

Embodiments of the present invention will be described with reference to the drawings. In the following description, the case where the electro-optical module to which the present invention is applied has a reflective liquid crystal panel as the electro-optical panel will be mainly described. In the drawings referred to in the following description, 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 the following description, the directions that intersect each other in the in-plane direction of the electro-optical panel 40 are defined as the X direction and the Y direction, and the normal direction to the electro-optical panel 40 is defined as the Z direction. In the Z direction, the light emission side (front surface side) is set as one side Z1, and the side opposite to the light emission side (back surface side) is set as the other side Z2.
It is as.

[Embodiment 1]
(Configuration of electro-optical panel 40)
FIG. 1 is an explanatory diagram of an electro-optical panel 40 used in the electro-optical module 100 according to Embodiment 1 of the present invention. FIGS. 1 (a) and 1 (b) each show the electro-optical panel 40 as each component. A plan view seen from the second substrate (counter substrate) side, and a cross-sectional view thereof taken along the line H-H '. Note that. In FIG. 1A, illustration of the dustproof glass 57 is omitted.

As shown in FIG. 1, the electro-optical panel 40 includes a first substrate 51 (element substrate) and a second substrate 52.
(Opposite substrate) is bonded to each other with a sealant 407 through a predetermined gap. First
The substrate 51 and the second substrate 52 are translucent substrates such as a quartz substrate and a glass substrate. In this embodiment, quartz substrates are used for the first substrate 51 and the second substrate 52. In this embodiment, the electro-optical panel 40 is a liquid crystal panel, and a liquid crystal layer as an electro-optical layer 450 is held in a region surrounded by the sealing material 407 between the first substrate 51 and the second substrate 52. . The sealing material 407 is provided in a frame shape along the outer edge of the second substrate 52. The sealing material 407 is a photo-curing adhesive, a thermosetting adhesive, or an adhesive having both photo-curing and thermosetting, and the distance between the two substrates is set to a predetermined value. Gap materials such as glass fiber or glass beads are blended.

In this embodiment, the first substrate 51 has a quadrangular shape, and end surfaces 511 and 512 are provided on each of the four sides.
513, 514. Similarly to the first substrate 51, the second substrate 52 is also rectangular.
End surfaces 521, 522, 523, and 524 are provided on each of the four sides. The first substrate 51 is larger in size than the second substrate 52, and the four end surfaces 511, 512, 513, 5,
14 are located outside the end surfaces 521, 522, 523, and 524 of the second substrate 52.
For this reason, the end surfaces of the electro-optical panel 40 of the present embodiment are the end surfaces 511, 512 of the first substrate 51,
513, 514.

A display area 40a that emits modulated light is provided as a square area in the approximate center of the electro-optical panel 40. Corresponding to this shape, the sealing material 407 is also provided in a substantially square shape. In the electro-optical panel 40, the end of the display area 40a and the end face of the electro-optical panel 40 (first
Between the end faces 511, 512, 513, 514) of the substrate 51, a square frame-shaped peripheral region 40 is provided.
c is provided.

In the first substrate 51, the end portion on the side where the end surface 514 is located (the end portion on the one side Y1 in the Y-axis direction) protrudes more greatly from the end surface 524 of the second substrate 52 than the other end portion, and the protruding portion 5
In FIG. 19, a data line driving circuit 401 and a plurality of terminals 402 are formed along the end face 514. Further, the scanning line driving circuit 404 is provided on the first substrate 51 along the end faces 511 and 512.
Is formed. A flexible wiring board 40 i is connected to the terminal 402, and various potentials and various signals are input to the first board 51 through the flexible wiring board 40 i.

Of the first surface 51 a and the second surface 51 b of the first substrate 51, the first facing the second substrate 52.
On the surface 51a, pixel electrodes 405a and pixel transistors (switching elements / not shown) corresponding to the pixel electrodes 405a are formed in a matrix in the display region 40a.
An alignment film 416 is formed on the upper layer side of the pixel electrode 405a. The first substrate 5
In one first surface 51a, a dummy pixel electrode 405b that is formed simultaneously with the pixel electrode 405a is formed in a region inside the sealing material 407 in the peripheral region 40c.

Of the first surface 52 a and the second surface 52 b of the second substrate 52, the first facing the first substrate 51.
A translucent common electrode 421 is formed on the surface 52 a, and an alignment film 426 is formed on the common electrode 421. The alignment films 416 and 426 are made of polyimide or an inorganic alignment film. In this embodiment, the alignment films 416 and 426 are made of, for example, SiO _x (x <2), SiO ₂ , T
It consists of an obliquely deposited film (inorganic alignment film) such as iO ₂ , MgO, Al ₂ O ₃ , In ₂ O ₃ , Sb ₂ O ₃ , Ta ₂ O _5, etc. The negative nematic liquid crystal compound is tilted vertically aligned. Therefore, the electro-optical panel 40 operates in a normally black VA mode.

The common electrode 421 is formed across a plurality of pixels as a substantially entire surface of the second substrate 52 or as a plurality of strip-like electrodes. In this embodiment, the common electrode 421 is formed over a substantially entire surface of the second substrate 52. . On the first surface 52 a of the second substrate 52, the light shielding layer 40 is disposed below the common electrode 421.
8 is formed. The light shielding layer 408 is formed in a frame shape extending along the outer peripheral edge of the display area 40 a, and the display area 40 a is defined by the inner edge of the light shielding layer 408. The outer peripheral edge of the light shielding layer 408 is at a position with a gap between the inner peripheral edge of the sealing material 407 and
The light shielding layer 408 and the sealing material 407 are not covered. In the second substrate 52, a light shielding layer formed simultaneously with the light shielding layer 408 may be formed as a black matrix or a black stripe in a region overlapping with a region sandwiched between adjacent pixel electrodes 405a.

In the first substrate 51, an inter-substrate conduction electrode for electrically conducting between the first substrate 51 and the second substrate 52 in a region overlapping the corner portion of the second substrate 52 outside the sealing material 407. 4
09 is formed. An inter-substrate conductive material 409a containing conductive particles is disposed between the inter-substrate conductive electrode 409 and the second substrate 52, and the common electrode 421 of the second substrate 52 includes the inter-substrate conductive material 409a and the substrate. It is electrically connected to the first substrate 51 side via the inter-connection electrode 409. For this reason, a common potential is applied to the common electrode 421 from the first substrate 51 side. The sealing material 407 is provided along the outer peripheral edge of the second substrate 52 with substantially the same width dimension. However, the sealing material 407 is provided so as to pass through the inside avoiding the inter-substrate conduction electrode 409 in a region overlapping the corner portion of the second substrate 52.

(Configuration as a reflective LCD panel)
In this embodiment, the electro-optical panel 40 is a reflective liquid crystal panel. Therefore, the common electrode 421 is formed of a light-transmitting conductive film such as an ITO (Indium Tin Oxide) film or an IZO (Indium Zinc Oxide) film, and the pixel electrode 405a is formed of a reflective conductive film such as an aluminum film. ing. In such a reflective liquid crystal panel (electro-optical panel 40), the arrows L11, L
As shown at 12, the light incident from the second substrate 52 side is modulated while being reflected and emitted from the first substrate 51 side to display an image. Therefore, in the electro-optical panel 40, the first substrate 5
A translucent substrate such as a quartz substrate can be used for both the first substrate 52 and the second substrate 52, while a translucent substrate such as a quartz substrate is used for the second substrate 52 and a silicon substrate or the like is used for the first substrate 51. The semiconductor substrate can be used. In this embodiment, a quartz substrate is used for both the first substrate 51 and the second substrate 52.

In the electro-optical panel 40 (reflective liquid crystal panel) configured as described above, the first surface 57 a of the translucent dust-proof glass 57 is attached to the second surface 52 b of the second substrate 52. Accordingly, the first surface 40e (one surface / front surface) of the electro-optical panel 40 is configured by the second surface 57b of the dust-proof glass 57, and the second surface 40f (other surface / back surface) of the electro-optical panel 40 is the first surface. The second surface 51b of the substrate 51 is configured. In addition, the display area 40 a is one surface 40 of the electro-optical panel 40.
Located on the e side.

(Overall configuration of electro-optic module 100)
FIG. 2 is a perspective view of the electro-optic module 100 according to Embodiment 1 of the present invention. FIG.
These are exploded perspective views of the electro-optic module 100 according to Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view of the electro-optic module 100 according to Embodiment 1 of the present invention.

As shown in FIGS. 2 and 3, the electro-optical panel 40 is mounted on an electronic device as an electro-optical module 100 supported by the holder 3 for the purpose of reinforcement or the like. Therefore, the electro-optic module 100 of this embodiment includes the electro-optic panel 40, the electro-optic panel 40, the holder 3 holding the electro-optic panel 40 inside, and the parting member 8 attached to the light emitting side of the holder 3. And have. In addition, the electro-optic module 100 according to the present embodiment has the heat sink 7 on the opposite side (second side 40f / back side) to the light emitting side (first side 40e / front side) with respect to the electro-optic panel 40. doing.

The holder 3 includes a frame portion 31 that surrounds the electro-optical panel 40 and a bottom plate portion 32 that overlaps the second surface side 40 f of the electro-optical panel 40, and is partitioned by the frame portion 31 and the bottom plate portion 32. The space is a panel housing portion 30 in which the electro-optic panel 40 is housed. Accordingly, after the electro-optical panel 40 is accommodated inside the holder 3 (panel accommodating portion 30), the frame portion 3
1 between the inner wall and the electro-optical panel 40, or the surface 32a of the bottom plate 32 and the electro-optical panel 40.
The electro-optical panel 40 can be fixed to the holder 3 by applying an adhesive between the two and curing it. In this embodiment, since the electro-optical panel 40 is rectangular, the frame portion 31 is formed in a rectangular frame shape, and the bottom plate portion 32 is formed in a rectangular shape. In this embodiment, the holder 3 is integrated as a whole. As the holder 3, a structure in which the frame portion 31 and the bottom plate portion 32 are separate bodies and the frame portion 31 and the bottom plate portion 32 are coupled by a method such as adhesion may be employed.

In the holder 3, the bottom plate portion 32 is formed with an opening 35 that opens the second surface 40 f of the electro-optical panel 40. For this reason, the second surface 40f of the electro-optical panel 40 is exposed from the opening 35 in a state where the electro-optical panel 40 is fixed to the inside of the holder 3 (panel housing portion 30). In this embodiment, the opening 35 is formed in a rectangular shape,
In plan view (when viewed from the normal direction (Z direction) to the electro-optical panel 40), the opening 35 overlaps the display area 40a. The planar size of the opening 35 is larger than the size of the display area 40a. A substrate outlet 39 is formed on the side of the frame 31 where the flexible wiring substrate 40i is provided.

The holder 3 is made of metal having a thermal expansion coefficient equivalent to that of the first substrate 51. In this embodiment, since the first substrate 51 is made of a quartz substrate, the holder 3 is made of an alloy containing at least nickel and iron. For example, the holder 3 is a so-called Invar alloy (for example, 36N
i-Fe alloy, 42Ni-Fe alloy, etc.), 32Ni-5Co-Fe alloy, 29Ni-1
7Co—Fe alloy or the like. Among these alloys, for example, the linear expansion coefficient of 36Ni—Fe alloy is about 1.2 × 10 ⁻⁶ (/ ° C.), and the linear expansion coefficient of 32Ni-5Co—Fe alloy is about 0.1 × 10 ^-6 (/ ° C), and the linear expansion coefficient of the first substrate 51 (quartz substrate) (
It is equivalent to about 0.48 × 10 ⁻⁶ (/ ° C.).

The parting member 8 has a light shielding plate portion 81 that overlaps the frame portion 31 of the holder 3 on the opposite side to the electro-optical panel 40, and in the light shielding plate portion 81, the display area 4 of the electro-optical panel 40.
A rectangular opening 810 is formed in a region overlapping 0a. The parting member 8 is made of resin or metal. In the parting member 8, the light shielding plate 81 functions as a parting part for the display area 40a. In the parting member 8, a connecting plate portion 85 that overlaps the outer surface 310 of the frame portion 31 of the holder 3 extends from an edge located on both sides in the X direction, of the outer peripheral edge of the light shielding plate portion 81. An engaging hole 850 is formed in the connecting plate portion 85, and an engaging convex portion 315 that engages with the engaging hole 850 is formed on the outer surface 310 of the frame portion 31. Therefore, the parting member 8 is attached to the holder 3 via the connecting plate portion 85.

(Configuration of heat sink 7 and heat conductive material 6)
The electro-optic module 100 according to the present embodiment includes the second of the electro-optic panel 40 inside the opening 35.
The heat sink 7 is opposed to the surface 40f. The heat sink 7 includes a plate portion 71 that overlaps the bottom plate portion 32 of the holder 3 on the side opposite to the electro-optical panel 40, and a plurality of plate-like fins 75 that protrude from the plate portion 71 to the side opposite to the electro-optical panel 40. In the plate portion 71, the surface 7 a on the holder 3 side (surface on the electro-optical panel 40 side) is fixed to the back surface 32 b of the bottom plate portion 32 of the holder 3 with an adhesive or the like.

Here, the heat sink 7 has a convex portion 72 that protrudes from the plate portion 71 into the opening portion 35 with a larger area than the display region 40 a in plan view, and the convex portion 72 is electro-optic inside the opening portion 35. It faces the second surface 40f of the panel 40. In this embodiment, the convex portion 72 has a rectangular planar shape, and the planar size of the convex portion 72 is slightly smaller than the planar size of the opening 35. For this reason, the outer peripheral surface 720 of the convex portion 72 and the inner peripheral surface 350 of the opening portion 35 are opposed to each other through the gap G1, and the gap G1 is the second surface 40f of the electro-optical panel 40 and the convex portion 72 of the heat sink 7. And communicates with G0.

In this embodiment, the heat sink 7 is made of a material having high thermal conductivity such as aluminum.
For example, the heat sink 7 is made of aluminum, and its linear expansion coefficient is about 23.5 × 1.
0 ^-6 (/ ° C). For this reason, the thermal expansion coefficients (linear expansion coefficients) of the heat sink 7, the holder 3, and the first substrate 51 have the following relationship: first substrate 51 ≈ holder 3 <heat sink 7
It is in.

(Configuration of fluid heat conductive material 6 etc.)
In the electro-optic module 100 of the present embodiment, the gap G 0 between the electro-optic panel 40 and the convex portion 72 of the heat sink 7 is filled with the fluid heat conductive material 6 inside the opening 35 of the holder 3. In this embodiment, the heat conductive material 6 is, for example, heat dissipation grease. As the heat dissipation grease, for example, a material mainly composed of silicone or a material in which metal particles such as silver are mixed in such a material can be used. In any case, the heat conductive material 6 only needs to have fluidity so that it can flow when it is sandwiched between the electro-optical panel 40 and the heat sink 7 when the electro-optical module 100 is manufactured. After the electro-optic module 100 is manufactured, a material that solidifies in a gel form may be used.

Further, at least one of the heat sink 7 and the holder 3 has a display area 40 in a plan view.
A concave portion communicating with G0 is formed between the electro-optical panel 40 and the convex portion 72 of the heat sink 7 outside the region overlapping with a. The concave portion is an escape portion that allows excess heat conductive material 6 to escape.

In the present embodiment, of the heat sink 7 and the holder 3, a recess 73 is formed on the surface 7 a (the surface on the electro-optical panel 40 side) of the heat sink 7 on the holder 3 side outside the region overlapping the display region 40 a in plan view. ing. In this embodiment, the concave portion 73 is formed at a position outside the convex portion 72 by a predetermined dimension in plan view, and the concave portion 73 is formed between the outer peripheral surface 720 of the convex portion 72 and the inner peripheral surface 350 of the opening portion 35. Through the gap G1, the electro-optical panel 40 and the heat sink 7
The convex portion 72 communicates with G0.

Here, the recess 73 is formed in the opening 3 on the surface 7a of the heat sink plate 71 in plan view.
It is formed in a groove shape at a position overlapping with the edge of 5. Further, the recess 73 extends along the edge of the opening 35. Further, the recess 73 is formed on the second surface 4 of the electro-optical panel 40 inside the opening 35.
A portion where 0f and the heat sink 7 face each other is surrounded by a rectangle over the entire circumference.

(Operation and main effect of this form)
As described above, in the electro-optic module 100 of this embodiment, the space between the electro-optic panel 40 and the heat sink 7 is filled with the fluid heat conductive material 6 (heat radiation grease).
For this reason, heat can be efficiently released from the electro-optical panel 40 to the heat sink 7 via the heat conductive material 6.

In order to manufacture the electro-optic module 100, the heat-sink 7 or the electro-optic panel 40 is coated with the fluid heat conductive material 6, and then the heat sink 7 and the electro-optic panel 40 are overlapped. The application amount of the heat conductive material 6 at that time is set to be larger than an amount necessary for filling G0 between the heat sink 7 and the electro-optical panel 40. For this reason, a region where the heat conductive material 6 does not exist does not occur between the heat sink 7 and the electro-optical panel 40.

Further, even if the heat conductive material 6 is applied more than the amount necessary to fill the heat sink 7 and the electro-optical panel 40, the excessive heat conductive material 6 is not formed between the electro-optical panel 40 and the convex portions 72 of the heat sink 7. From the gap G0, it flows into the concave portion 73 through the gap G1 between the outer peripheral surface 720 of the convex portion 72 and the inner peripheral surface 350 of the opening portion 35. Therefore, the convex portion 72 of the electro-optical panel 40 and the heat sink 7
Since G0 is filled with an appropriate amount of the heat conductive material 6, it is possible to avoid a situation in which the electro-optic panel 40 is deformed due to excessive stress applied to the electro-optic panel 40.

Further, the recess 73 is provided outside the area overlapping the display area 40a in plan view. For this reason, in the region overlapping with the display region 40a, the variation in the amount of the heat conductive material 6 due to the presence or absence of the recess 73 does not occur, and therefore, the heat dissipation variation due to the variation in the amount of the heat conductive material 6 hardly occurs. .

Further, the recess 73 extends along the edge of the opening 35. For this reason, since the recessed part 73 exists in the position comparatively near from G0 between the electro-optical panel 40 and the heat sink 7, even if the viscosity of the heat conductive material 6 is high, the excess heat conductive material 6 smoothly enters the recessed part 73. Flows in. Also,
The recess 73 surrounds the part of the opening 35 where the electro-optic panel 40 and the heat sink 7 are opposed to each other over the entire circumference. For this reason, even if the viscosity of the heat conductive material 6 is high, the excessive heat conductive material 6 smoothly flows into the recess 73 from any position between G0 between the electro-optical panel 40 and the heat sink 7.

Further, the heat sink 7 has an opening 35 with a wider area in the display area 40a in plan view.
A convex portion 72 that protrudes inward and faces the second surface 40 f of the electro-optical panel 40 is provided. For this reason, since the heat sink 7 and the electro-optical panel 40 can be brought close to each other, heat can be efficiently released from the electro-optical panel 40 to the heat sink 7. Even in this case, the concave portion 73 is provided outside the convex portion 72 in plan view. For this reason, between the convex part 72 and the electro-optical panel 40, the location where the quantity of the heat conductive material 6 differs due to the presence or absence of the concave part 73 does not occur.

[Embodiment 2]
FIG. 5 is a cross-sectional view of the electro-optic module 100 according to Embodiment 2 of the present invention. FIG.
These are explanatory drawings, such as the recessed part 33 (escape part of the heat conductive material 6) etc. which were provided in the electro-optic module 100 which concerns on Embodiment 2 of this invention, FIG.6 (a), (b) shows the holder 3 in FIG. It is the perspective view seen from the opposite side to the light emission side, and the perspective view which looked at the heat sink 7 from the light emission side. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 5 and 6, the electro-optic module 100 of the present embodiment is also the first embodiment.
Similarly to the heat sink 7 made of aluminum facing the second surface 40f of the electro-optical panel 40,
have. Further, the heat sink 7 has a convex portion 72 that protrudes from the plate portion 71 into the opening 35 with a larger area than the display area 40 a in plan view, and the convex portion 72 is connected to the second surface 40 f of the electro-optical panel 40. Opposite. In addition, inside the opening 35 of the holder 3, the gap G <b> 0 between the electro-optical panel 40 and the convex portion 72 of the heat sink 7 is filled with a fluid heat conductive material 6 made of heat radiation grease. Also in this embodiment, at least one of the heat sink 7 and the holder 3 has a concave portion (excessive portion) communicating with G0 between the electro-optical panel 40 and the convex portion 72 of the heat sink 7 outside the region overlapping the display region 40a in plan view. A relief portion of the heat conductive material 6 is formed.

In the present embodiment, of the heat sink 7 and the holder 3, the back surface 5b (the surface on the heat sink 7 side) of the holder 3 is formed with a recess 33 outside the region overlapping the display region 40a in plan view. In this embodiment, the concave portion 33 is formed at a position outside the convex portion 72 by a predetermined dimension in plan view, and the concave portion 33 includes the outer peripheral surface 720 of the convex portion 72 and the inner peripheral surface 35 of the opening 35.
It communicates with G0 between the electro-optical panel 40 and the convex portion 72 of the heat sink 7 through a gap G1 with zero.

Here, in the holder 3, the recess 33 is formed in a notch shape between the heat sink 7 side surface (back surface 32 b) and the inner peripheral surface 350 of the opening 35. Specifically, the concave portion 33 has a shape in which a corner portion where the heat sink 7 side surface (back surface 32 b) and the inner peripheral surface 350 of the opening 35 are connected to each other is cut out in a step shape. The concave portion 33 extends along the edge of the opening 35, and the concave portion 33 is a portion where the second surface 40 f of the electro-optical panel 40 and the heat sink 7 are opposed to each other inside the opening 35. Surrounded by a rectangle over the entire circumference.

Even in such a configuration, as in the first embodiment, even if the heat conductive material 6 is applied in an amount larger than that necessary to fill the heat sink 7 and the electro-optical panel 40, the excess heat conductive material 6
The outer peripheral surface 720 of the convex portion 72 from G0 between the electro-optic panel 40 and the convex portion 72 of the heat sink 7.
Between the electro-optic panel 40 and the convex portion 72 of the heat sink 7 is an appropriate amount of the heat conductive material 6. Since it is buried, it is possible to avoid a situation where an excessive stress is applied to the electro-optical panel 40 and the electro-optical panel 40 is deformed.

In this embodiment, the corner 33 where the back surface 32b of the holder 3 and the inner peripheral surface 350 of the opening 35 are connected to each other is cut out stepwise to form the recess 33. The concave portion 33 may be formed by obliquely notching a corner portion where the peripheral surface 350 is connected. Further, the concave portion 33 may be formed in the holder 3 and the concave portion 73 described in the first embodiment may be formed in the heat sink 7.

[Other forms of electro-optic module]
In the above embodiment, the reflection type liquid crystal panel has been described as an example of the electro-optical panel 40. However, the present invention is not limited to this, and an organic electroluminescence display panel, a plasma display panel, an FED (Field Emission Display) is used. Panel, SED (Surface-Co
nduction Electron-Emitter Display) panel, LED (Light Emitting Diode) display panel,
The present invention may be applied to an electro-optic module using an electrophoretic display panel or the like.

[Example of mounting on electronic devices]
(Configuration example of a projection display device)
FIG. 7 is a schematic configuration diagram of an example of a projection display device (electronic apparatus) to which the present invention is applied. In the following description, three electro-optic modules 100 according to the above-described embodiment are used, and the electro-optic panels 40 of the three electro-optic modules 100 are respectively a red liquid crystal panel 100R, a green liquid crystal panel 100G, and a blue liquid crystal panel. Used as 100B.

A projection display apparatus 1000 shown in FIG. 7 includes a light source unit 1021 that generates light source light, and a light source unit 1.
The color separation light guide optical system 1023 that separates the light source light emitted from 021 into three color lights of red light R, green light G, and blue light B, and each color emitted from the color separation light guide optical system 1023 And a light modulator 1025 illuminated by the light source light. In addition, the projection display device 1000
Includes a cross dichroic prism 1027 (combining optical system) that combines the image light of each color emitted from the light modulation unit 1025, and a projection optical system 1029 that projects the image light that has passed through the cross dichroic prism 1027 onto a screen (not shown). It has. In this embodiment, the plurality of electro-optic modules 100 (reflection type liquid crystal device) and the cross dichroic prism 1027 (light combining optical system) constituting the light modulation unit 1025 constitute an optical unit 1200.

In the projection display apparatus 1000, the light source unit 1021 includes a light source 1021a, a pair of fly-eye optical systems 1021d and 1021e, a polarization conversion member 1021g, and a superimposing lens 1021i. In the present embodiment, the light source unit 1021 includes a reflector 1021f having a paraboloid and emits parallel light. Fly's eye optical system 1021d, 10
21e is composed of a plurality of element lenses arranged in a matrix in a plane orthogonal to the system optical axis, and the light source light is divided by these element lenses to be individually condensed and diverged. The polarization conversion member 1021g converts the light source light emitted from the fly-eye optical system 1021e into, for example, only a p-polarized component parallel to the drawing, and supplies it to the optical path downstream optical system. The superimposing lens 1021i allows the plurality of electro-optic modules 100 provided in the light modulation unit 1025 to be uniformly superimposed and illuminated by appropriately converging the light source light that has passed through the polarization conversion member 1021g as a whole.

The color separation light guide optical system 1023 includes a cross dichroic mirror 1023a, a dichroic mirror 1023b, and reflection mirrors 1023j and 1023k. In the color separation light guide optical system 1023, the substantially white light source light from the light source unit 1021 enters the cross dichroic mirror 1023a. The red light R reflected by one of the first dichroic mirrors 1031a constituting the cross dichroic mirror 1023a is reflected by the reflecting mirror 1023j, passes through the dichroic mirror 1023b, and transmits the incident side polarizing plate 1037r and p-polarized light. The light enters the electro-optic module 100 (red liquid crystal panel 100R) as p-polarized light through the wire grid polarizer 1032r that reflects s-polarized light and the optical compensation plate 1039r.

Further, the green light G reflected by the first dichroic mirror 1031a is reflected by the reflection mirror 10.
23j, then reflected by the dichroic mirror 1023b, and incident-side polarizing plate 1037g, which transmits p-polarized light while reflecting s-polarized light.
032g and the optical compensator 1039g, the electro-optic module 1 remains p-polarized.
Enter 00 (green liquid crystal panel 100G).

On the other hand, the blue light B reflected by the other second dichroic mirror 1031b constituting the cross dichroic mirror 1023a is reflected by the reflection mirror 1023k,
The incident-side polarizing plate 1037b transmits the p-polarized light while reflecting the s-polarized light, and reflects the s-polarized light to the electro-optic module 100 (blue liquid crystal panel 100B) while maintaining the p-polarized light through the optical compensation plate 1039b. Incident. The optical compensator 1039r, 1
039g and 1039b optically compensate the characteristics of the liquid crystal layer by adjusting the polarization state of the incident light and the outgoing light to the electro-optic module 100.

In the projection display apparatus 1000 configured as described above, the optical compensation plates 1039r and 1039g
Each of the three colors of light incident through 1039b is modulated in each electro-optic module 100. At that time, of the modulated light emitted from the electro-optic module 100, the s-polarized component light is reflected by the wire grid polarizers 1032r, 1032g, and 1032b, and cross-dichroic via the exit-side polarizers 1038r, 1038g, and 1038b. Prism 102
7 is incident. The cross dichroic prism 1027 is formed with a first dielectric multilayer film 1027a and a second dielectric multilayer film 1027b that intersect in an X shape, and the first dielectric multilayer film 1027a reflects the red light R. The other second dielectric multilayer film 1027b reflects the blue light B. Therefore, the three colors of light are combined by the cross dichroic prism 1027 and emitted to the projection optical system 1029. The projection optical system 1029 projects the color image light combined by the cross dichroic prism 1027 onto a screen (not shown) at a desired magnification.

(Other projection display devices)
For the projection display device, an LED light source that emits light of each color is used as the light source unit, and the color light emitted from the LED light source is supplied to another electro-optical device (liquid crystal device). It may be configured.

(Other electronic devices)
The electro-optical module 100 to which the present invention is applied includes, in addition to the above electronic devices, a mobile phone, a personal digital assistant (PDA), a digital camera,
You may use as a direct-view display apparatus in electronic devices, such as a liquid crystal television, a car navigation apparatus, a videophone, a POS terminal, and the apparatus provided with the touch panel.

3 .. Holder, 6 .. Heat conductive material, 7.. Heat sink, 8.
Panel housing part, 31 .. frame part, 32 .. bottom plate part, 33 .. recess (heat escape material escape part),
35 .. Opening, 40... Electro-optical panel, 40 a... Display area, 40 e... First surface (one surface) of electro-optical panel, 40 f. ..First
Substrate 52, second substrate 57, dust-proof glass 71, plate part 72, convex part 73
Recessed part (relief part of heat conducting material), 75 .. Fin, 421 .. Common electrode, 450 .. Electro-optic layer, 100 .. Electro-optic module, 1000 .. Projection type display device, 1021. ..Projection optical system, G0 ..Between electro-optical panel and heat sink

Claims (10)

An electro-optic panel provided with a display region for emitting display light on one side;
A holder having an opening for holding the electro-optical panel and opening the other surface of the electro-optical panel;
A heat sink facing the other surface of the electro-optic panel;
A fluid heat conductive material filling the space between the electro-optic panel and the heat sink inside the opening;
Have
At least one of the heat sink and the holder is formed with a recess communicating between the electro-optical panel and the heat sink outside a region overlapping the display region in plan view. module. The electro-optical module according to claim 1, wherein the recess extends along an edge of the opening. The electro-optical module according to claim 2, wherein the concave portion surrounds a portion of the opening where the electro-optical panel and the heat sink are opposed to each other over the entire circumference. The heat sink includes a convex portion that protrudes into the opening portion with a larger area in the plan view and faces the other surface of the electro-optical panel.
The electro-optic module according to claim 1, wherein the concave portion is provided outside the convex portion in a plan view. 5. The electro-optic module according to claim 1, wherein the concave portion is formed in a groove shape in the heat sink so as to overlap with an edge of the opening in a plan view. The said recessed part is formed in the said holder in the shape of a notch between the surface at the side of the said heat sink, and the internal peripheral surface of the said opening part, The Claim 1 thru | or 4 characterized by the above-mentioned. Electro-optic module. The thermal expansion coefficient of the holder is smaller than that of the heat sink.
The electro-optic module according to claim 1. The electro-optic module according to claim 1, wherein the heat conducting material is heat dissipating grease. The electro-optical panel includes a first substrate, a second substrate bonded to the first substrate with a sealing material, and a space surrounded by the sealing material between the first substrate and the second substrate. A liquid crystal layer provided inside,
The electro-optical module according to claim 1, wherein the other surface of the electro-optical panel is a surface of the first substrate opposite to the second substrate. An electronic apparatus comprising the electro-optic module according to claim 1,
A light source unit for emitting light supplied to the electro-optical panel;
A projection optical system that projects light modulated by the electro-optical panel;
An electronic device characterized by comprising:

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