JP2007279104A - Liquid crystal device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device which can have reliability of display quality by improving response of liquid crystal without providing an additional member for heating, and electronic equipment using the liquid crystal device. <P>SOLUTION: The liquid crystal device has an air layer 52 interposed between a first substrate 7 as one substrate and a light guide plate 29, and a case 5 which houses a liquid crystal panel etc., and has opening parts 55 and 57 capable of discharging air to the outside and located on the opposite side from a light source side. The air layer 52 between the first substrate 7 and light guide plate 29 is heated mainly on the light source side with heat of a light source 28, and air having expanded in the air layer 52 attempts to be discharged to the outside because the opening parts 55 and 57 are formed, resulting in flow of the air toward the opening parts. The air flow carries heat, and after all, sufficiently warm air spreads almost to nearby the opening parts away from the light source side, thereby impartially warming the liquid crystal 9 through the first substrate 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a liquid crystal device used for a personal computer, a mobile phone, and the like, and an electronic apparatus using the liquid crystal device.

Conventionally, a liquid crystal device is used as a display device of an electronic device such as a personal computer or a mobile phone. The liquid crystal device sandwiches a liquid crystal between a pair of substrates and applies a voltage to the liquid crystal. The image is displayed by the change of the arrangement.

However, if the temperature of the switching element that applies a voltage to each pixel of the liquid crystal is non-uniform, the switching characteristics differ depending on the location of the substrate surface, resulting in a display failure.

In addition, the responsiveness of the liquid crystal varies depending on the temperature, and in particular, the responsiveness at a low temperature is poor and the display performance is deteriorated.

Therefore, an electro-optical panel in which an electro-optical material is supported on a substrate, an optical member disposed adjacent to the electro-optical panel, a light guide plate disposed to face the electro-optical panel via the optical member, and A light source unit that irradiates light to the light guide plate, and a frame-shaped member that is disposed at least partially between the electro-optical panel and the light guide plate and surrounds the periphery of the optical member. It is proposed to arrange so as to be in contact with the light source unit (see, for example, Patent Document 1). In addition, in a liquid crystal display device having a liquid crystal panel in which liquid crystal is sealed between a pair of substrates provided opposite to each other, a translucent heat generating panel is brought into contact with at least one surface of the liquid crystal panel. Has been proposed (see, for example, Patent Document 2).
JP 2004-69825 A (paragraph [0009], FIG. 2). Japanese Patent Application Laid-Open No. 8-171084 (paragraph [0004], FIG. 1).

However, according to the proposal of Patent Document 1, heat is dispersed throughout the electro-optical panel, and display unevenness due to switching elements can be prevented. However, this is not always sufficient to improve the response of the liquid crystal at low temperatures. The problem of not being considered.

On the other hand, although the temperature of the liquid crystal can surely be raised by the proposal of Patent Document 2 and the response of the liquid crystal is improved, a heat generating panel has to be provided, and the number of parts increases and the cost increases. Further, the thickness of the liquid crystal device is increased by the amount of the heat generating panel, and further, there is a problem that the light transmittance is lowered.

The present invention has been made in view of the above-described problems, and a liquid crystal device capable of improving the responsiveness of liquid crystal without providing a new member for heating and improving the reliability of display quality, and the liquid crystal device therefor An object of the present invention is to provide an electronic device using the.

In order to achieve the above object, a liquid crystal device according to a main aspect of the present invention includes a light source that emits light, a light guide that receives light emitted from the light source on a side end surface, and a pair of substrates that sandwich the liquid crystal. A liquid crystal panel that receives the light emitted from the light guide from one of the pair of substrates, and a surface of the one substrate on the light guide, and at least one of the substrates An air layer interposed between the substrate and the light guide, the liquid crystal panel, the air layer, the light source, and the light guide are accommodated, and the side on which the light source is disposed with respect to the light guide And a case having an opening capable of discharging air to the outside on the opposite side.

Here, the “substrate” refers to a glass substrate, for example, and includes a polarizing plate, a retardation plate, and the like provided on the surface of the glass substrate or the like.

The present invention includes an air layer interposed between at least one of a pair of substrates and a light guide, a liquid crystal panel, and the like, and an opening capable of discharging air to the outside on the side opposite to the light source side. And having a case. Therefore, the air layer between the substrate and the light guide is heated by the heat of the light source around the light source side, and the air expands. On the other hand, since there is an opening in contact with the outside on the side opposite to the light source side, the air expanded in the air layer tends to exit to the outside, and air can flow on the opening side. In addition, since this air flow has heat, the air that is sufficiently warm spreads to the vicinity of the opening away from the light source side. As a result, the heat of the light source spreads over the entire substrate of the liquid crystal panel, and the liquid crystal is uniformly warmed through the substrate, and in particular, the response of the liquid crystal at a low temperature can be improved.

Further, since the heat of the light source is used, it is not necessary to prepare a separate heating element for heating the liquid crystal panel, the number of parts can be prevented from being increased, the cost can be reduced, and a thinner liquid crystal device can be obtained. Furthermore, since a heating element is not provided in the optical path of the backlight, the problem that the light transmittance is reduced can be avoided.

According to an aspect of the present invention, the air layer is interposed between the light source and a side end surface of the light guide so as to communicate therewith. Thereby, since the air layer is also communicated between the light source whose temperature rises and the side end surface of the light guide, the heat of the light source can be propagated most efficiently to the substrate.

According to an aspect of the present invention, the opening is provided on a side surface of the case at a position corresponding to the space between the one substrate and the light guide. As a result, the opening is located at substantially the same position as the air layer to be discharged in the thickness direction of the liquid crystal device, so that air can be easily discharged from the opening, and the air layer between the substrate and the light guide The flow of heat flow becomes smooth.
Therefore, the heat of the light source spreads more quickly over the entire surface of the substrate of the liquid crystal panel, and uniform and efficient heating of the liquid crystal becomes possible.

According to an aspect of the present invention, a lens sheet is further provided between the air layer and the light guide, and the light guide is provided on the first side on the light source side and the first side. The plane having the second side facing each other has a square shape, and the lens sheet has a groove on the air layer side from the first side to the second side, and the lens. The air layer communicating with the gap between the light source and the side end surface of the light guide is also interposed on the side end surface of the sheet on the light source side. Thereby, it can prevent as much as possible that the groove | channel of a lens sheet prevents the flow of the heated air which goes to the opening part which is the other side from the light source side.

According to an aspect of the present invention, the groove is formed by a protrusion having a prismatic cross section adjacent to the groove. Thereby, the air resistance on the groove surface is reduced, the heat of the light source can be more efficiently propagated to the entire air layer, and the shape of the lens sheet is simple and easy to manufacture.

According to one aspect of the present invention, the top of the projection of the lens sheet is separated from the one substrate. Thereby, an air layer can be secured on the entire surface of the substrate of the liquid crystal panel, and the heat of the light source can be more easily transferred to the entire surface of the substrate. In addition, it is possible to prevent display quality deterioration such as occurrence of Newton rings.

According to an aspect of the present invention, the light guide has a third side adjacent to the first and second sides, and the groove is provided in a direction parallel to the third side. It is characterized by being. Accordingly, the groove is formed as a parallel straight line from the first side that is the light source side to the second side that is the opening side, and is thus heated to flow through the air layer to the opening. It is possible to prevent air flow resistance.

In addition, since the groove is formed in a direction parallel to the third side of the light guide, the planar surface extends from the first side on the light source side to the second side on the opening side on the entire surface of the light guide. Overlapping groove shapes can be formed. Accordingly, it is possible to prevent the heat propagation from the light source from being hindered in the entire region of the light guide that overlaps the display region of the liquid crystal panel.

According to an aspect of the present invention, the light guide has a third side adjacent to the first and second sides, and the groove is in a direction parallel to the third side. It is provided in an oblique direction so as to form an acute angle. This reduces the obstruction of heat from the light source in the air layer, enabling uniform heating of the liquid crystal panel and suppressing the occurrence of moiré due to the pitch between the pixels of the liquid crystal panel and the lens sheet. it can.

According to an aspect of the present invention, the light source includes a plurality of point light sources, and the opening is formed so as to be shifted from a position facing the plurality of point light sources in a planar manner. . Here, the “point light source” includes, for example, an LED (Light Emitting Diode). If there is an opening at a position facing the point light source in a plane, the movement of heat in the air layer is likely to move the shortest distance, but if the position is misaligned, the movement of heat will wrap around Since it flows, heat is more diffused over the entire surface of the substrate, and the liquid crystal can be heated more uniformly.

According to an aspect of the present invention, the apparatus further includes a radiator that contacts the plurality of point light sources and extends along an arrangement direction of the plurality of point light sources. Thereby, the heat of the point light source is distributed in a line shape of the heat radiating plate, and heating to a more uniform air layer becomes possible.

According to one aspect of the present invention, the light source comprises a linear light source, and contacts the linear light source,
It further comprises a radiator that extends along the linear direction. Thereby, the heat of the linear light source becomes a wider heat source, and the heat transfer to the substrate becomes more efficient. Here, the “linear light source” refers to, for example, a cold cathode tube and a reflector.

  An electronic apparatus according to another aspect of the present invention includes the above-described liquid crystal device.

The present invention includes a liquid crystal device capable of improving the responsiveness of liquid crystal without providing a new member for heating and improving the reliability of display quality, so that an electronic device with high display quality can be manufactured at low cost. Can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, an example of a liquid crystal device is a TFT (Thin Film Transistor).
An active matrix liquid crystal device and an electronic device using the liquid crystal device will be described, but the present invention is not limited thereto. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure and the scale and number of each structure are different.

  (First embodiment)

1 is a schematic perspective view of a liquid crystal device according to a first embodiment of the present invention, FIG. 2 is a partial cross-sectional view taken along line AA of FIG. 1 (a driver IC (Integrated Circuit) is not cut), and FIG. Fig. 4 is a plan view of the lighting device and the case, and Fig. 4 is a partial cross-sectional view taken along line BB of Fig. 3 (the side walls of the case are not shown).

  (Configuration of liquid crystal device)

For example, as shown in FIG. 1, the liquid crystal device 1 includes a liquid crystal panel 2, a flexible substrate 3 electrically connected to the liquid crystal panel 2 and a light source described later, an illumination device 4 that emits light to the liquid crystal panel 2, and the liquid crystal And a case 5 for housing a panel, a lighting device, and the like. Here, in addition to the case 5 and the like, other incidental mechanisms are attached to the liquid crystal device 1 as necessary (not shown).

As shown in FIGS. 1 and 2, the liquid crystal panel 2 includes a first substrate 7 (one of the pair of substrates) and a second substrate 8 as a pair of substrates bonded via a sealant 6. It includes a TN (Twisted Nematic) type liquid crystal 9 enclosed in a gap between both substrates.

Each of the first and second substrates 7 and 8 includes first and second base materials 7a and 8a made of translucent plate-like members such as glass, for example. As shown in FIG. Second substrate 7a,
Polarizing plates 10 and 11 for polarizing incident light are attached to the outside of 8a (the side opposite to the liquid crystal).

In addition, the first base material 7a has a gate electrode 12 formed in the Y-axis direction and a source electrode 13 as a signal line formed in the X-axis direction as shown in FIGS. Further, an alignment film 14 is formed on the liquid crystal side such as the gate electrode 12 and the source electrode 13. The gate electrode 12 and the source electrode 13 are made of nickel, for example,
It is electrically connected to a TFT (not shown). The TFT is electrically connected to the pixel electrode 15 made of ITO (indium tin oxide) or the like.

As a result, when a voltage is applied to the gate electrode 12, the gate electrode 12 and the source electrode 13 cause a current to flow from the source electrode 13 to the pixel electrode 15 or vice versa. Here, the source electrode 13 applies a data signal to the pixel electrode 15, and the pixel electrode 15 applies a voltage to the liquid crystal 9 sandwiched between the common electrode described later.

Further, the first base material 7a has a projecting portion 16 projecting from the outer peripheral edge of the second base material 8a as shown in FIGS. 1 and 2, for example, and the projecting portion 16 includes the gate electrode 12 and the source. Electrode 1
A gate electrode wiring 17 and a source electrode wiring 18 are formed extending from the region 3 surrounded by the sealing material 6 to the overhanging portion 16. Further, a driver IC 19 for driving a liquid crystal electrically connected to each electrode wiring is mounted on the overhang portion 16.

Further, the overhanging portion 16 is, for example, an electrode terminal (not shown) electrically connected to the gate electrode wiring 17 and the source electrode wiring 18 in a region corresponding to the mounting surface of the driver IC 19 as shown in FIGS. In addition, an input terminal (not shown) for inputting a current from the flexible substrate 3 or the like to the driver IC 19 is provided.

Further, as shown in FIG. 2, for example, the overhang portion 16 includes an external terminal 20 that receives current from the flexible substrate 3 and the like, and an input wiring 21 that supplies current from the outside to the input terminal.

For example, as shown in FIG. 2, a light shielding member 51 is stuck on the opposite side to the mounting surface of the driver IC 19 of the overhang portion 16 so as to cover the entire overhang portion 16.

For example, as shown in FIG. 2, the driver IC 19 has a plurality of bumps 22 that are electrically connected to the electrode terminals and the input terminals on the mounting surface to be mounted on the projecting portion 16. This electrical connection is achieved by, for example, an anisotropic conductive film (ACF (Anisotropic Conductive Fibre) which is also an adhesive between the electrode terminal and the input terminal and the bump 22.
lm)).

On the other hand, the second substrate 8a has a common electrode 2 on its inner surface (liquid crystal side) as shown in FIG.
3 is formed, and an alignment film 24 is formed on the liquid crystal side of the common electrode 23.

In addition, although not shown in figure in the liquid crystal side of the 1st and 2nd base materials 7a and 8a, if necessary, a base layer,
A reflective layer, a colored layer, a light shielding layer, and the like are formed.

Next, for example, as shown in FIGS. 1 and 2, the flexible substrate 3 is formed by mounting a wiring pattern 26 made of copper (Cu) or the like on a base substrate 25 as a substrate.

Here, the base substrate 25 is a film-like member having flexibility. Further, the wiring pattern 26 is a connection terminal (not shown) formed at the end of the base substrate 25 on the protruding portion side.
The connection terminal is electrically connected to the external terminal 20 of the liquid crystal panel 2 through an anisotropic conductive film 27, for example. Further, a part of the wiring pattern 26 is formed on a branched base substrate 25a and is electrically connected to a light source.

Next, the illuminating device 4 is a backlight unit that supplies light to the liquid crystal panel 2 as shown in FIGS. 1, 2, and 3, for example, and includes a light source 28, a light guide plate 29 as a light guide, and two lenses. Sheets 30, 31, a diffusion sheet 32, a reflection sheet 33, and the like are included.

Here, the light source 28 includes, for example, four light emitting diodes (hereinafter referred to as “LED” (Light Em).
It is called “itching Diode”. ) 28a, 28b, 28c, 28d are used and FIG.
As shown in FIGS. 2 and 3, the light emitting surface 35 is spaced apart from the side end surface of the light guide plate 29 on the light source side. Thereby, an air layer described later is also formed between the light emitting surface 35 and the side end surface of the light guide plate 29.
The first substrate and the light guide plate 29 are in communication with each other.

The light guide plate 29 emits the light incident from the light source 28 to the entire diffusion sheet 32.

The light guide plate 29 has, for example, a flat plate shape having substantially the same thickness as shown in FIGS. 1, 2, and 3, and both surfaces of the flat plate plate form light incident from the light source 28 on the diffusion sheet 32. An exit surface 36 that emits light, and a reflective surface 37 that reflects light by the reflective sheet 33 on the side opposite to the exit surface 36.
And have.

Furthermore, the light guide plate 29 has a rectangular plane as shown in FIGS. 2 and 3, for example.
As shown in FIG. 3, a side 29a as a first side on the light source side, a side 29b as a second side opposite to the side 29a, and a third side adjacent to the first and second sides It has a side 29c and a side 29d opposite to the side 29c. Further, a side end face 38 serving as a light receiving surface for receiving light from the light source 28 is provided on the side 29a.

The light guide plate 29 is molded by injection molding or extrusion molding using, for example, acrylic resin.

Next, the two lens sheets 30, 31, the diffusion sheet 32, and the reflection sheet 33 are formed in substantially the same size as the light guide plate 29 as shown in FIGS. 1, 2, and 3. Is a silver foil sheet having the same size as that of the reflecting surface 37 on the reflecting surface 37 (downward in the figure) of the light guide plate 29.

Further, a diffusion sheet 32 having the same size as that of the emission surface 36 is attached on the emission surface 36 (liquid crystal panel side) of the light guide plate 29, and two lens sheets 30 and 31 are further disposed thereon. .
The diffusion sheet 32 emits uniform light by diffusion, and the lens sheet 30,
31 is for improving the luminance of the light emitted from the diffusion sheet 32 and irradiating the polarizing plate 10 of the liquid crystal panel 2.

Further, the lens sheets 30 and 31 are also provided on the side end surface 56 on the light source side of the light source 28 and the light guide plate 2.
An air layer communicating with the gap with the side end surface 38 is provided so as to be able to intervene. Thereby, the air heated by the light source 28 can rise to between the light guide plate 29 and the first substrate 7.

Here, for example, as shown in FIG. 4, the two lens sheets 30 and 31 are each provided with a prism having an apex angle of 90 degrees in parallel on the air layer side surface, and the cross-section is projected by the adjacent prism-shaped protrusion 34. V-shaped grooves 30a and 31a are formed.

Further, the lens sheet 30 arranged on the air layer side has a groove direction from a side 29a as the first side of the light guide plate 29 to a side 29b as the second side as shown in FIG. A groove 30a is formed. Specifically, as shown in FIG. 3, a plurality of light guide plates 29 are juxtaposed in parallel with the side 29c as the third side (Y-axis direction in FIG. 3).

Furthermore, the protrusion 34 of the cross-sectional prism shape which adjoins and forms the said groove | channel 30a of the lens sheet 30. FIG.
The top portion 30b faces the polarizing plate 10 with an air layer interposed therebetween, but a space 39 is formed as shown in FIG. An air layer is formed by the space 39 and the like as will be described later.

On the other hand, the lens sheet 31 has a shape similar to that of the lens sheet 30, and diffuses with the lens sheet 30 so that the groove 31a is orthogonal to the direction of the groove 30a of the lens sheet 30 (X-axis direction in FIG. 3). It is arranged between the sheet 32. For example, as shown in FIG. 4, the top portion 31 b of the projection 34 of the lens sheet 31 is disposed so as to contact the side surface opposite to the projection 34 side of the lens sheet 30.

Next, the case 5 includes, for example, an upper case 5a and a lower case 5b, as shown in FIG.

The upper case 5a has a substantially rectangular display opening 40 at its center as shown in FIGS. 1 and 2, for example, and is formed in a frame shape so as to cover the lower case 5b. 44a
, 46a, 47a, 48a.

Further, for example, as shown in FIG. 1, the upper case 5a is provided with an upper case guide groove 43 substantially at the center of the lower end of the side wall 44a on the projecting portion 16 side of the liquid crystal panel 2. As shown in FIG. Has been pulled out.

Further, on the side wall 46a facing the side wall 44a and opposite to the light source side, as shown in FIG. 2, for example, a substantially rectangular opening 55 capable of discharging the air in the case is provided outside the case 5. .

Here, the opening 55 is provided at the position of the side wall 46 a corresponding to, for example, between the first substrate 7 and the light guide plate 29. Specifically, as shown in FIG. 2, the thickness direction of the liquid crystal device 1 (Z in FIG.
In the axial direction, an opening 55 penetrating to the outside is formed from substantially the same position as the light guide plate side surface of the polarizing plate 10 to substantially the same position as the top portion 30 b of the projection side surface of the lens sheet 30. Of course, the opening 55 is not limited to this, and may be larger or smaller in the thickness direction, and the position thereof may be shifted. However, in order for the air heated by the light source to flow easily in the direction of the opening 55, it is preferable that the air is approximately matched from the top 30b to the surface of the polarizing plate 10.

Further, for example, as shown in FIG. 3, the opening 55 is provided at three locations apart from the side wall 46 a as viewed in a plan view, and the LEDs 28 a, 28 b, 28 c, 28 d (hereinafter referred to as “LED 28”)
a etc. " ) Are placed between each of them. That is, the openings 55 are provided at alternate planar positions in relation to the light source. Of course, the formation of the opening 55 in the planar direction is not limited to this, and the opening 55 may be provided at a position facing the light source, or may be provided so as to partially overlap. However, rather than providing the opening 55 so as to completely face the LED 28a and the like, the warmed airflow flows more widely in a plane when shifted slightly, so that the heat of the light source can be used efficiently.

The number and size of the openings 55 can be arbitrarily adjusted. For example, when the heat of the air layer is to be retained more, the opening area of the openings 55 can be reduced or the number thereof can be reduced. It ’s fine. Of course, the number of the openings 55 may be more than three.

Next, as shown in FIGS. 1, 2 and 3, the lower case 5b includes an LED 28a, etc.
3, the diffusion sheet 32 and the light guide plate 29 to which the two lens sheets 30 and 31 are adhered are provided with a recess 41 on the inside so that the side wall 44b, 46b, 47b, 4
8b is formed.

Further, the lower case 5b is formed on the side wall 4 of the liquid crystal panel 2 on the projecting portion 16 side as shown in FIG.
A lower case guide groove 45 is provided at substantially the center of the upper end of 4b, and the flexible substrate 3 is pulled out or bent as shown in FIG.

In addition, for example, as shown in FIG. 2, the lower case 5 b has a liquid crystal panel 2 in which the surface of the polarizing plate 10 on the light guide plate 29 side is at a distance E (E in FIG. 2) 0.1 mm to 0.00 mm. 5m
It is formed so as to be held apart by about m. As a result, the space 39 described above is obtained.
For example, since air is contained in the lower case 5b, the space 39 becomes a part of the air layer.

Further, the lower case 5b has a side wall 46 facing the side wall 44b as shown in FIGS. 2 and 3, for example.
b and side walls 47b and 48b sandwiched between the side walls 44b and 46b, and the side surfaces of the side walls are formed so as to be separated from the side surfaces 49 of the reflection sheet 33, the light guide plate 29 and the like. Thereby, a space 50 is also formed between each side wall and the light guide plate 29 and the like, and these spaces 39 are formed.
50, an air layer 52 is formed.

Further, the side wall 46b has a substantially rectangular opening 5 that can discharge the air in the case to the outside of the case 5.
7 is provided.

Here, the opening 57 is, for example, the side wall 4 at a position corresponding to between the first substrate 7 and the light guide plate 29.
6b. Specifically, as shown in FIGS. 2 and 3, the thickness direction of the liquid crystal device 1 of the opening 55 (Z-axis direction in FIG. 2) and the side 29b direction of the light guide plate 29 (X-axis direction in FIG. 2). It is formed so as to substantially coincide with the position. As a result, the opening 55 and the opening 57 are overlapped to form an opening, and the warmed airflow from the light source in the case 5 is discharged to the outside of the case 5 through the openings 55 and 57. Will be.

In addition, the distance between the side wall 49 of the lower case 5b and the side surface 49 such as the light guide plate is not limited to a fixed value, and may vary depending on the location, for example. May be gone.

  (Operation of liquid crystal device)

Next, the operation of the liquid crystal device 1 configured as described above will be briefly described focusing on how the heat from the light source proceeds.

FIG. 5 is a view for explaining how the heat of the light source proceeds from the side surface side, and FIG. 6 is a partially enlarged explanatory view of FIG.

First, when a predetermined current is supplied to, for example, the LED 28a or the like by a drive circuit (not shown), the LED 28a or the like emits light from the light emitting surface 35 and generates heat. And the LED
For example, as shown in FIG. 5, the heat generated from the LED 28a moves around the LED 28a, for example, to the air layer 52 interposed between the side end surface 38 of the light guide plate 29 and the LED 28a. Then, the warmed air in the air layer 52 rises (arrow F in FIG. 5) and the light guide plate and the lower case 5b.
The space 50 between the light shielding member 51 and the polarizing plate 10 is reached. here,
Since the space 39 is formed between the polarizing plate 10 and the lens sheet 30, warmed air is accumulated in the space 39, and a warm air layer 52 is formed.

At this time, the side walls 46a and 46b opposite to the light source side of the upper case 5a and the lower case 5b are formed with openings 55 and 57 that are open to the outside air. Flowing in the direction of the portions 55 and 57 (arrow G in FIG. 5), a heated air flow path is formed from the light source side toward the opposite side.

Moreover, the groove 30a on the air layer side surface of the lens sheet 30, which is one contact surface of the air layer 52, against the movement of the heated air is, for example, a side of the light guide plate 29 as shown in FIGS. The direction (arrow H in FIG. 6) is substantially coincident with the flow of airflow (arrow I in FIG. 6) from the light source side toward the opposite side. Therefore, the groove 30a of the lens sheet 30 does not hinder the flow of heat flow from the light source side toward the opposite side.

As described above, the flow of the heated air between the lens sheet 30 and the polarizing plate 10 spreads the heat of the light source 28 over the entire surface of the polarizing plate 10, thereby suppressing the occurrence of local temperature unevenness and efficient. Then, the liquid crystal 9 and the like are heated through the polarizing plate 10.

Further, the air that has become low temperature by supplying heat to the polarizing plate 10 between the polarizing plate 10 and the lens sheet 30 returns to the vicinity of the light source again from the gap between the side wall of the lower case 5b and the side surface of the light guide plate, etc. Therefore, the air is heated and rises again as heated air.

  Above, description of operation | movement of the liquid crystal device 1 is complete | finished.

As described above, according to the present embodiment, the air layer 52 interposed between the first substrate 7 as at least one substrate and the light guide plate 29, the liquid crystal panel, and the like are accommodated, and the external side is provided on the side opposite to the light source side. And a case 5 having openings 55 and 57 capable of discharging air. Accordingly, the air layer 52 between the first substrate 7 and the light guide plate 29 is heated by the heat of the light source 28 around the light source side, and the air expands.

On the other hand, since there are openings 55 and 57 in contact with the outside on the side opposite to the light source side, the air expanded in the air layer 52 tends to exit to the outside and the air can flow toward the opening. In addition, since this air flow has heat, the air that is sufficiently warm spreads to the vicinity of the opening away from the light source side. Thereby, the heat of the light source 28 spreads over the entire first substrate of the liquid crystal panel 2, and the liquid crystal 9 is warmed through the first substrate 7 without unevenness, and in particular, the response of the liquid crystal at a low temperature is improved. It becomes possible.

Further, since the heat of the light source 28 is used, it is not necessary to prepare a separate heating element for heating the liquid crystal panel 2, the number of parts can be prevented from being increased, the cost can be reduced, and a thinner liquid crystal device 1 can be obtained. It becomes. Furthermore, since a heating element is not provided in the optical path of the backlight, the problem that the light transmittance is reduced can be avoided.

Further, since the openings 55 and 57 are provided so as to face the opposite side of the light source of the air layer 52 interposed between the first substrate 7 and the light guide plate 29, the openings 55 and 57 discharge. The position of the power layer is substantially the same as the thickness direction of the liquid crystal device 1. Therefore, the air can be easily discharged from the opening, and the heat flow of the air layer 52 between the first substrate 7 and the light guide plate 29 becomes smooth. Thereby, the heat of the light source 28 spreads more quickly on the entire surface of the first base material 7a of the liquid crystal panel 2, and the uniform and efficient heating of the liquid crystal 9 becomes possible.

The light guide plate 29 has a square shape with a side 29a on the light source side and a side 29b opposite to the side, and the lens sheet 30 has a groove 30a from the side 29a side to the side 29b side on the air layer side. I decided to have it. Therefore, it is possible to prevent the groove 30a of the lens sheet 30 from obstructing the flow of the heated air from the light source side toward the openings 55 and 57 on the opposite side as much as possible.

Further, since the groove 30a is formed by the adjacent prism-shaped protrusions 34, the air resistance of the groove surface is reduced, and the heat of the light source 28 can be more efficiently propagated to the entire air layer 52. In addition, it is simple in shape and easy to manufacture.

Further, since the top 30b of the projection 34 of the lens sheet 30 is separated from the polarizing plate 10 by E (E in FIG. 2), for example, the air layer 52 is placed on the entire surface of the polarizing plate 10 of the liquid crystal panel 2. The heat of the light source 28 can be more easily transferred to the entire surface of the substrate. In addition, it is possible to prevent display quality deterioration such as occurrence of Newton rings.

Further, since the groove 30a is formed as a parallel straight line from the side 29a which is the light source side to the side 29b which is the opening side, the heated air which is about to flow to the openings 55 and 57 in the air layer. It can be prevented that the resistance of the flow becomes.

Further, since the groove 30a is formed in a direction parallel to the side 29c of the light guide plate 29, a groove shape that overlaps in a planar manner is formed from the light source side side 29a toward the opening side 29b over the entire surface of the light guide plate. be able to. Therefore, it is possible to prevent the heat propagation from the light source 28 from being hindered in the entire region of the light guide plate 29 that overlaps the effective display region C of the liquid crystal panel 2.

Further, since the light source 28 is composed of a plurality of point light sources such as LEDs 28a and the openings 55 and 57 are formed so as to be shifted from the positions facing the LEDs 28a and the like in plan view, the movement of heat wraps around. Therefore, the heat is more diffused over the entire surface of the substrate. Therefore, the liquid crystal 9
Can be heated more uniformly.

  (Modification 1)

Next, a modification of the liquid crystal device according to the present invention will be described. In the present modification, the point that the opening is provided also on the light source side is different from that of the first embodiment, so that this point will be mainly described. In the following description, the components common to the components of the first embodiment will be described as the first.
The same reference numerals as those of the constituent elements of the embodiment are attached, and the description thereof is omitted or simplified.

  (Configuration of liquid crystal device)

FIG. 7 is a schematic perspective view of a liquid crystal device according to a first modification of the present invention, and FIG. 8 is a plan view of a lighting device and a case.

For example, as shown in FIG. 7, the liquid crystal device 101 includes a liquid crystal panel 2, a flexible substrate 3 electrically connected to the liquid crystal panel 2, etc., an illuminating device 4 that emits light to the liquid crystal panel 2, and the liquid crystal panel and illumination. And a case 105 that accommodates a device and the like. Here, the liquid crystal device 10
In addition to the case 105 and the like, other auxiliary mechanisms are attached to 1 as needed (not shown).

Next, the case 105 includes, for example, an upper case 105a and a lower case 105b as shown in FIG. 7, and accommodates the liquid crystal panel 2, an air layer 52, a light source 28, a light guide plate 29, and the like described later.

The upper case 105a has a substantially rectangular display opening 40 at the center thereof as shown in FIGS. 7 and 8, for example, and is formed in a frame shape so as to cover the lower case 105b. 144a, 46a, 47a, 48a are provided.

Further, for example, as shown in FIG. 7, the upper case 5 a has a substantially rectangular opening that can take air outside the case into the case 105 at the substantially lower left and right ends of the side wall 144 a on the projecting portion 16 side of the liquid crystal panel 2. 155 is provided, and an upper case guide groove 43 is provided substantially at the center lower side.

Here, the opening 155 is, for example, in the thickness direction of the liquid crystal device 101 (Z-axis direction in FIG. 7) from substantially the same position as the surface opposite to the display side (light guide plate side surface) of the polarizing plate 10. The projection side surface is formed so as to open to the outside corresponding to the substantially same position as the top portion 30b. Of course, the opening 155 is not limited to this, and may be, for example, near the lower end of the side wall 144a. However, if the opening 155 is provided between the polarizing plate 10 and the lens sheet 30 at substantially the same height (in the Z-axis direction in FIG. 2), the flow of heated air can be made more smoothly.

The opening 155 is provided at the left and right ends of the side wall 144a as shown in FIG. 8, for example, as viewed in a plan view, and is disposed so as to sandwich the LED 28a and the like from both sides. Of course, opening 1
The arrangement place of 55 is not limited to this, and may be provided near the light source in a planar manner, for example. However, since the airflow flows from the ends when the openings 155 are provided at the left and right ends, the entire surface of the polarizing plate 10 can be more efficiently heated without unevenness.

Next, as shown in FIGS. 7 and 8, the lower case 105 b includes the LED 28 a and the reflection sheet 33.
The light guide plate 29 to which the diffusion sheet 32 and the two lens sheets 30 and 31 are adhered is accommodated so that the recess 41 is provided on the inner side, and the side walls 144b, 46b, 47b, and 4 are provided around the recess 41.
8b is formed.

Further, for example, as shown in FIG. 7, the lower case 105b is provided with openings 157 at the left and right ends of the side wall 144b of the liquid crystal panel 2 on the projecting portion 16 side, and the lower case guide groove 45 at the substantially upper center of the same side wall 144b. Is provided.

Here, the opening 157 is, for example, as shown in FIGS. 7 and 8, the liquid crystal device 10 in the opening 155.
1 is formed so as to substantially coincide with the position in the thickness direction of 1 and the side 29a direction of the light guide plate 29.
Thereby, the opening 155 and the opening 157 are formed so that the openings are substantially overlapped,
Air flows from the outside of the case 105 into the case.

  (Operation of liquid crystal device)

Next, since the operation of the liquid crystal device 101 configured as described above is substantially the same as that of the first embodiment, the description thereof is omitted.

Thus, according to this modification, the opening 15 communicated with the side walls 144a and 144b on the light source side.
5 and 157 are provided, the air discharged from the openings 55 and 57 can be smoothly discharged from the case 10.
5 is supplied. In addition, the flow is, for example, the opening 55 in the thickness direction of the liquid crystal device 101.
, 57 is substantially the same as the positions 57, an air flow is formed in a plane, and heat is efficiently supplied to the entire surface of the polarizing plate 10.

Further, since the openings 155 and 157 are formed so as to sandwich the light source 28 on both the left and right sides, the heat of the light source 28 can be propagated over a wider range, and the liquid crystal 9 can be heated without unevenness. .

  (Second Embodiment)

Next, a second embodiment of the liquid crystal device according to the present invention will be described. In the present embodiment, the point that the groove of the lens sheet is provided in an oblique direction is different from that of the first embodiment.

  (Configuration of liquid crystal device)

  FIG. 9 is a plan view of a lighting device and a case according to the second embodiment of the present invention.

The liquid crystal device 201 includes, for example, a liquid crystal panel 2 and the liquid crystal panel 2 as shown in FIGS.
A flexible substrate 3 as a flexible substrate electrically connected to the liquid crystal panel 2, a lighting device 204 that emits light to the liquid crystal panel 2, and a case 5 that houses the liquid crystal panel, the lighting device, and the like. Here, in addition to the case 5 and the like, other incidental mechanisms are attached to the liquid crystal device 201 as needed (not shown).

The illumination device 204 is a backlight unit that supplies light to the liquid crystal panel 2 as shown in FIG. 1, and includes a light source 28, a light guide plate 29 as a light guide, two lens sheets 230 and 231, a diffusion sheet 32, and a reflection. A sheet 33 and the like are included.

Here, the lens sheets 230 and 231 are formed in substantially the same size as the light guide plate 29 as shown in FIG. 9 similarly to the diffusion sheet 32 and the reflection sheet 33, and are stuck on the exit surface 36 of the light guide plate 29. It is disposed on the diffusion sheet 32 formed. The lens sheets 230 and 231 improve the luminance of light emitted from the diffusion sheet 32 and irradiate the polarizing plate 10 of the liquid crystal panel 2.

In addition, the two lens sheets 230 and 231 both have a plurality of prisms with apex angles of 90 degrees arranged in parallel on the air layer side surface.
Character-shaped grooves 230a and 231a are formed.

Further, the lens sheet 230 disposed on the air layer 52 side is formed with grooves 230a so that the groove direction is directed from the side 29a to the side 29b of the light guide plate 29 as shown in FIG.
Specifically, the groove 230a is, for example, the side 29 as the third side of the light guide plate 29 as shown in FIG.
A plurality of lines are arranged in parallel in an oblique direction so as to form an acute angle θ (θ in FIG. 9) with respect to a direction parallel to c (Y-axis direction in FIG. 9).

In addition, the top portion 230b of the adjacent prism-shaped protrusion 34 forming the groove 230a of the lens sheet 230 is opposed to the polarizing plate 10 through the air layer 52, but a space 39 is formed so as not to be in direct contact therewith. Has been.

On the other hand, the lens sheet 231 has the same shape as the lens sheet 230, and the groove 231a thereof.
Is disposed between the lens sheet 230 and the diffusion sheet 32 so as to be, for example, just orthogonal to the direction of the groove 230a of the lens sheet 230. Of course, the groove 231 of the lens sheet 231.
It is only necessary for a to intersect the direction of the groove 230a of the lens sheet 230, and is not limited to being orthogonal.

  (Operation of liquid crystal device)

Next, the operation of the liquid crystal device 201 configured as described above will be briefly described with a focus on how heat flows in the lens sheet.

  FIG. 10 is a diagram for explaining how heat flows in the lens sheet.

The heated air in the air layer 52 heated by the LED 28a or the like is formed in the openings 55 and 57.
At this time, the groove 23 on the surface of the lens sheet 230 in contact with the air layer 52
For example, as shown in FIG. 10, the surface of the prism of 0a is a flow of the air (arrow K in FIG. 10).
Will be slanted. As a result, the flow of air heated by the heat from the light source 28 does not have to hit the groove 230a at a right angle.

  This is the end of the description of the operation of the liquid crystal device 201.

As described above, according to the present embodiment, the groove 230a of the lens sheet 230 is provided in an oblique direction so as to form an acute angle θ (θ in FIG. 9) with respect to a direction parallel to the side 29c of the light guide plate 29. It was decided that Therefore, the occurrence of moire due to the pitch between the pixels of the liquid crystal panel 2 and the lens sheets 230 and 231 can be suppressed.

Further, the prism surface of the groove 230 a on the surface of the lens sheet 230 does not hit the heated airflow flowing through the air layer 52 toward the openings 55 and 57 at right angles, so that heat from the light source 28 is generated in the air layer 52. It is possible to uniformly heat the liquid crystal panel 2 by reducing the obstruction to the propagation to the openings 55 and 57.

  (Third embodiment)

Next, a third embodiment of the liquid crystal device according to the present invention will be described. In this embodiment, since the point provided with the heat sink which contacts a light source differs from 1st Embodiment, it demonstrates centering on the point.

  (Configuration of liquid crystal device)

FIG. 11 is a cross-sectional view of a liquid crystal device according to a third embodiment of the present invention, and FIG. 12 is a plan view of a lighting device, a heat sink, and a case.

For example, as shown in FIG. 11, the liquid crystal device 301 includes a liquid crystal panel 2, a flexible substrate 3 electrically connected to the liquid crystal panel 2, and the like, and an illumination device 304 that emits light to the liquid crystal panel 2.
And a case 5 for housing the liquid crystal panel, the lighting device, and the like. Here, the liquid crystal device 3
In addition to the case 5 and the like, other incidental mechanisms are attached to 01 as needed (not shown).

As shown in FIG. 11, the illumination device 304 is a backlight unit that supplies light to the liquid crystal panel 2, and includes a light source 28, a light guide plate 329 as a light guide, and two lens sheets 330 and 331.
, A diffusion sheet 332, a reflection sheet 333, a heat dissipation plate 334 as a heat radiator, and the like.

Here, for example, four LEDs 28a, 28b, 28c, and 28d are used as the light source 28.
As shown in FIG. 12, the light emitting surfaces 35 are arranged so as to be spaced apart from the side end surfaces 38 of the light guide plate 329 on the light source side. Accordingly, the air layer is interposed between the light emitting surface 35 and the side end surface 38 of the light guide plate so as to communicate with the space between the first substrate 7 and the light guide plate 329.

Further, for example, as shown in FIGS. 11 and 12, the back surface (the side opposite to the light emitting surface) of the LED 28a and the like is in direct contact with the heat radiating plate 334, and heat generated from the LED 28a and the like is efficiently transmitted to the heat radiating plate 334. Can do. Furthermore, for example, as shown in FIG. 11, the LED 28a and the like are provided with a flexible substrate 3 for supplying current on the bottom side thereof. In addition, when the said LED28a etc. have a thermal radiation part, it arrange | positions so that the thermal radiation board 334 may contact | connect the thermal radiation part.

Here, the light guide plate 329, the diffusion sheet 332, and the reflection sheet 333 are substantially the same except that the light guide plate 29, the diffusion sheet 32, and the reflection sheet 33 of the first embodiment are different in size. Omitted.

The two lens sheets 330 and 331 have grooves 30a and 31a formed on their respective surfaces. However, the lens sheets 30 and 31 of the first embodiment are substantially the same except that the lens sheets themselves are different in size. Since it is the same, the description is abbreviate | omitted.

On the other hand, the heat radiating plate 334 has a substantially quadrangular rectangular shape as shown in FIGS.
The LED 28a is in contact with the back surface of the LED 28a and the like, and the inner wall is disposed along the arrangement direction of the LED 28a and the like. Further, for example, as shown in FIG.
It is formed larger than the back surface of ED28a etc., and the heat sink 334 is exposed from between each LED.

Further, the inner wall 371 of the heat radiating plate 334 maintains a predetermined distance from the side surface 49 such as the reflection sheet 333 or the light guide plate, and the outer wall 372 is disposed so as to substantially contact the side wall 44b of the lower case 5b.

The heat radiating plate 334 is made of, for example, a metal such as aluminum (Al), and the thermal conductivity is about 200 W / m · K if it is aluminum.

In addition, it is desirable to use a metal having high thermal conductivity for the heat radiating plate 334. However, if the heat radiating plate 334 is provided with a reflecting function to increase the light emission efficiency of the light source 28, the light leaking to the back surface of the light source 28 is reflected to the light guide plate 329. There is no need to provide a separate reflector or the like.

  (Operation of liquid crystal device)

Next, the operation of the liquid crystal device 301 configured as described above will be briefly described focusing on how the heat from the light source proceeds.

  FIG. 13 is a view for explaining how the heat of the light guide plate proceeds from the side surface side.

First, when a predetermined current is supplied to, for example, the LED 28a or the like by a drive circuit (not shown), the LED 28a or the like emits light from the light emitting surface 35 and generates heat. And the LED
For example, as shown in FIG. 13, the heat generated from 28a etc.
34 (arrow M in FIG. 13) and spreads in the heat radiating plate 334.

Further, the heat spread to the heat radiating plate 334 becomes a linear temperature distribution of the arranged LEDs 28a and the like, and is transmitted to the air layer 52 in contact with the exposed region N of the heat radiating plate 334, for example, as shown in FIGS. Then, the warmed air in the air layer 52 rises, and the light guide plate and the heat radiating plate 334.
, And reaches the light shielding member 51 and the polarizing plate 10.

Here, since the space 39 is formed between the polarizing plate 10 and the lens sheet 330, the warmed air is accumulated in the space 39, and the warm air layer 52 is formed.

At this time, the side walls 46a and 46b opposite to the light source side of the upper case 5a and the lower case 5b are formed with openings 55 and 57 that are open to the outside air. Flowing in the direction of the portions 55 and 57 (arrow P in FIG. 13), a heated air flow path is formed from the light source side toward the opposite side.

Moreover, the groove 30a on the air layer side surface of the lens sheet 330, which is one contact surface of the air layer 52, is provided in parallel with the side 29c of the light guide plate 29, for example, against the movement of the heated air. The direction substantially coincides with the flow of airflow (arrow P in FIG. 13) from the light source side toward the opposite side. Therefore, the groove 30a of the lens sheet 330 does not hinder the flow of heat flow from the light source side toward the opposite side.

Thus, the flow of the heated air between the lens sheet 330 and the polarizing plate 10 spreads the heat of the light source 28 over the entire surface of the polarizing plate 10, suppressing the occurrence of local temperature unevenness and efficient. Then, the liquid crystal 9 and the like are heated through the polarizing plate 10.

In addition, the air that has become low temperature by supplying heat to the polarizing plate 10 between the polarizing plate 10 and the lens sheet 330 returns to the vicinity of the heat dissipation plate again from the gap between the side wall of the lower case 5b and the side surface of the light guide plate, etc. Therefore, the air is heated and rises again as heated air.

Of course, the air layer 52 is heated not only from the heat radiating plate 334 but also by air in direct contact with the light source 28.

  This is the end of the description of the operation of the liquid crystal device 301.

As described above, according to the present embodiment, the LED 28a, which is a plurality of point light sources, is in contact with the LED 28a.
Further, a heat radiating plate 334 extended along the arrangement direction of the ED 28a and the like is further provided. Therefore, if the point light source remains as it is, there is a possibility that heat distribution according to the position of the light source may occur. Is possible.

  (Modification 2)

Next, Modification Example 2 of the liquid crystal device according to the invention will be described. In this modification, the point that a cold cathode tube is used as the light source is different from that of the third embodiment, so that this point will be mainly described. In the following description, constituent elements common to the constituent elements of the first and third embodiments are denoted by the same reference numerals as those constituent elements, and description thereof is omitted or simplified.

  (Configuration of liquid crystal device)

  FIG. 14 is a cross-sectional view of a liquid crystal device according to Modification 2 of the present invention.

As shown in FIG. 14, for example, the liquid crystal device 401 includes a liquid crystal panel 2, a flexible substrate 3 as a flexible substrate electrically connected to the liquid crystal panel 2, and the like, and an illumination device 404 that emits light to the liquid crystal panel 2. And a case 5 for housing the liquid crystal panel, the lighting device, and the like.
Here, in addition to the case 5 and the like, other incidental mechanisms are attached to the liquid crystal device 401 as needed (not shown).

As shown in FIG. 14, the illumination device 404 is a backlight unit that supplies light to the liquid crystal panel 2, and includes a light source 28, a light guide plate 329 as a light guide, and two lens sheets 330 and 331.
A diffusion sheet 332, a reflection sheet 333, and the like.

Here, the light source 28 includes, for example, a cold cathode tube 461 and its cold cathode tube 461 as shown in FIG.
The reflector 46 reflects the light emitted from the light guide plate 329 in the opposite direction to the light guide plate 329.
2

For example, as shown in FIG. 14, the cold cathode tube 461 is disposed along the side end surface 38 of the light guide plate 329, and the current is supplied by the wiring pattern 26 of the flexible substrate 3, for example.

For example, as shown in FIG. 14, the reflector 462 has a substantially concave cross section, and is arranged on the opposite side of the cold cathode tube 461 from the light guide plate 329 so as to cover the cold cathode tube 461.

Further, the reflector 462 has a back surface (a side opposite to the reflecting surface) as shown in FIG.
Is in direct contact with the heat radiating plate 334, and the heat generated from the cold cathode fluorescent lamp 461 is efficiently radiated from the heat radiating plate 334.
Can be communicated to.

In the above description, the reflector 462 and the heat radiating plate 334 are configured separately, but the present invention is not limited to this. For example, the reflector and the heat radiating plate may be integrally formed. This makes it possible to more efficiently supply heat from the reflector to the heat radiating plate, simplify the assembly process and the like, and reduce the manufacturing cost.

Further, as described above, the LED 28a or the like of the first embodiment is not provided with the heat dissipation plate 334, and the reflector 462 reflects the light emitted from the cold cathode tube 461 and the cold cathode tube 461 in the direction opposite to the light guide plate to the light guide plate. It is good.

  (Operation of liquid crystal device)

Next, the operation of the liquid crystal device 401 configured as described above is substantially the same as that of the third embodiment except that the light source 28 is changed from the LED to the cold cathode tube 461 and the like, and thus the description thereof is omitted.

As described above, according to the present modification, the light source 28 includes the cold cathode tube 461 as an example of a linear light source and the reflector that reflects the light emitted from the cold cathode tube 461 in the direction opposite to the light guide plate 329 to the light guide plate 329. 462, and is further provided with a heat radiating plate 334 that is in contact with the reflector 462 and extends along the linear direction, so that the heat of the cold cathode tube 461 becomes a wider heat source, and the first Heat transfer to the substrate 7 becomes more efficient.

  (Fourth Embodiment / Electronic Device)

Next, an electronic apparatus according to a fourth embodiment of the present invention that includes the liquid crystal devices 1, 101, 201, 301, and 401 described above will be described.

FIG. 15 is a schematic external view of a mobile phone according to a fourth embodiment of the present invention, and FIG. 16 is a schematic external view of a personal computer.

For example, the mobile phone 500 includes, for example, the liquid crystal device 1 in an outer frame having a mouthpiece 572 and a mouthpiece 573 in addition to a plurality of operation buttons 571 as shown in FIG.

As shown in FIG. 16, the personal computer 600 includes a main body 682 having a keyboard 681 and a liquid crystal display unit 683, and the liquid crystal display unit 6.
For example, the outer frame 83 includes the liquid crystal device 1.

In addition to the liquid crystal device 1, these electronic devices include various circuits such as a display information output source and a display information processing circuit, and a display signal generation unit including a power supply circuit that supplies power to these circuits, although not shown. Consists of.

Further, for example, in the case of the personal computer 600, the liquid crystal device 1 is supplied with a display signal generated by the display signal generation unit based on information input from the keyboard 681, so that a display image is supplied to the liquid crystal device 1. Is displayed.

According to the present embodiment, since the liquid crystal device 1 that can improve the responsiveness of the liquid crystal 9 and improve the display quality without providing a new member for heating is provided, an electronic device with high display quality is provided. Equipment can be provided at low cost.

In particular, portable electronic devices such as those described above are required to have a clear screen display even when used outdoors. For example, the present invention that can improve liquid crystal response even at low temperatures is significant. It can be said.

In addition, examples of the electronic device include a touch panel equipped with a liquid crystal device, a projector, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation, a pager, an electronic notebook, a calculator, and the like. Needless to say, for example, the liquid crystal devices 1, 101, 201, 301, and 401 described above can be applied as display units of these various electronic devices.

The present invention is not limited to any of the above-described embodiments and modifications, and can be implemented with appropriate modifications within the scope of the technical idea of the present invention. Moreover, in the range which does not deviate from the summary of this invention,
Each embodiment and modification which were mentioned above can be combined.

For example, in the above-described embodiments, the thin film transistor element active matrix type liquid crystal device has been described as an example of the liquid crystal device. However, the present invention is not limited to this. Also good. As a result, even in a wide variety of liquid crystal devices, the responsiveness of the liquid crystal 9 can be improved without providing a new heating member, and the display quality can be improved.

Further, in the above description, the driver IC 19 is described as COG (Chip On Glass). However, the present invention is not limited to this. For example, the driver IC 19 is mounted on the flexible substrate 3.
The case of F (Chip On Film) may also be used. As a result, even in a wide variety of liquid crystal devices, the responsiveness of the liquid crystal 9 can be improved without providing a new heating member, and the display quality can be improved.

1 is a schematic perspective view of a liquid crystal device according to a first embodiment. FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1 (a driver IC is not cut). It is a top view of the illuminating device and case which concern on 1st Embodiment. FIG. 4 is a partial cross-sectional view taken along line BB in FIG. 3 (side walls of the case are not shown). It is a figure explaining how heat advances concerning the 1st embodiment from the side. It is a partial enlarged view explaining how to advance heat according to the first embodiment. 10 is a schematic perspective view of a liquid crystal device according to Modification 1. FIG. It is a top view of the illuminating device which concerns on the modification 1, and a case. It is a top view of the illuminating device and case which concern on 2nd Embodiment. It is the elements on larger scale explaining how to advance the heat concerning a 2nd embodiment. It is sectional drawing of the liquid crystal device which concerns on 3rd Embodiment. It is a top view of the illuminating device, heat sink, and case which concern on 3rd Embodiment. It is a figure explaining how to advance the heat which concerns on 3rd Embodiment from the side surface side. 10 is a cross-sectional view of a liquid crystal device according to Modification 2. FIG. It is the external appearance schematic of the mobile telephone which concerns on 4th Embodiment. It is the external appearance schematic of the personal computer which concerns on 4th Embodiment.

Explanation of symbols

1, 101, 201, 301, 401 Liquid crystal device, 2 Liquid crystal panel, 3 Flexible substrate, 4, 204, 304, 404 Illumination device, 5,105 Case, 6
Seal material, 7 first substrate, 8 second substrate, 9 liquid crystal, 10, 11 polarizing plate,
12 gate electrode, 13 source electrode, 14, 24 alignment film, 15 pixel electrode,
16 Overhang, 17 Gate electrode wiring, 18 Source electrode wiring, 19 Driver IC, 20 External terminal, 21 Input wiring, 22 Bump, 23 Common electrode, 25 Base substrate, 26 Wiring pattern, 27 Anisotropy Conductive film, 28
Light source, 29,329 light guide plate, 30,31,230,231,330,331 lens sheet, 32,332 diffusion sheet, 33,333 reflection sheet, 34 protrusion,
35 light emitting surface, 36 exit surface, 37 reflecting surface, 38, 56 side end surface, 39, 5
0 space, 40 display opening, 41 recess, 43 upper case guide groove, 45
Lower case guide groove, 44, 46, 47, 48, 144 side wall, 49 side surface, 51
Light shielding member, 52 air layer, 55, 57, 155, 157 opening, 334 heat sink, 371 inner wall, 372 outer wall, 461 cold cathode tube, 462 reflector,
500 mobile phone, 571 operation buttons, 572 earpiece, 573 mouthpiece,
600 personal computer, 681 keyboard, 682 main body, 683
Liquid crystal display unit, C effective display area, E distance, F, G, H, I, K, M, P
Arrow, N Exposed area

Claims (12)

A light source that emits light;
A light guide that receives light emitted from the light source on a side end surface;
A liquid crystal panel having a pair of substrates sandwiching liquid crystal, and receiving the light emitted from the light guide from one of the pair of substrates;
An air layer that is in contact with the surface of the one substrate on the light guide side and is interposed between at least the one substrate and the light guide;
A case that accommodates the liquid crystal panel, the air layer, the light source, and the light guide, and has an opening that can discharge air to the outside of the light guide on the side opposite to the side where the light source is disposed. And a liquid crystal device. The liquid crystal device according to claim 1, wherein the air layer is interposed between the light source and a side end surface of the light guide. The liquid crystal device according to claim 1, wherein the opening is provided on a side surface of the case at a position corresponding to between the one substrate and the light guide. Further comprising a lens sheet between the air layer and the light guide,
The light guide has a square shape with a first side on the light source side and a plane having a second side facing the first side,
The lens sheet has a groove on the air layer side from the first side to the second side, and the light source and the light guide are also formed on a side end surface of the lens sheet on the light source side. 4. The liquid crystal device according to claim 1, wherein the air layer communicating with a gap with a side end surface of the body is interposed. 5. The liquid crystal device according to claim 4, wherein the groove is formed by a protrusion having a prismatic cross section adjacent to the groove. The liquid crystal device according to claim 5, wherein a top portion of the projection of the lens sheet is separated from the one substrate. The light guide has a third side adjacent to the first and second sides;
The liquid crystal device according to claim 4, wherein the groove is provided in a direction parallel to the third side. The light guide has a third side adjacent to the first and second sides;
7. The groove according to claim 4, wherein the groove is provided in an oblique direction so as to form an acute angle with respect to a direction parallel to the third side. 8. Liquid crystal device. The light source comprises a plurality of point light sources,
The liquid crystal device according to any one of claims 1 to 8, wherein the opening is formed so as to be shifted from a position facing the plurality of point light sources in a plan view. The liquid crystal device according to claim 9, further comprising a heat dissipating member that is in contact with the plurality of point light sources and extends along an arrangement direction of the plurality of point light sources. The light source comprises a linear light source,
9. The liquid crystal device according to claim 1, further comprising a heat dissipating member that contacts the linear light source and extends along the linear direction. . An electronic apparatus comprising the liquid crystal device according to any one of claims 1 to 11.

Images