JP7056081B2 - Display device - Google Patents

Description

The present invention relates to, for example, a display device mounted on a vehicle and displaying various information related to the vehicle.

As a conventional display device, for example, the one described in Patent Document 1 is known. The display device of Patent Document 1 includes a display panel (organic EL display device), a circuit board, a semiconductor element, and a housing. A circuit board is arranged on one side of the display panel, and the circuit board is fixed to the display panel with a first heat conductive adhesive. Further, a semiconductor element is provided on the side opposite to the display panel of the circuit board. The semiconductor element side of the circuit board is fixed to the housing by the second heat conductive adhesive.

In the display device of Patent Document 1, the heat generated from the display panel is transferred to the housing side via the first heat conductive adhesive, the circuit board, and the second heat conductive adhesive, and the heat is transferred to the housing side of the display panel. Heat is dissipated.

JP-A-2015-114641

In the display device of Patent Document 1, the first and second heat conductive adhesives are provided from the viewpoint of releasing (dissipating heat) the heat of the display panel to the outside of the housing. However, from the viewpoint of heat generation of each member, the temperature rise of the semiconductor element is overwhelmingly larger than the temperature rise of the display panel during operation, and the display panel is easily affected by the heat from the semiconductor element. There is a reality. When the display panel receives heat from the semiconductor element, the emission brightness in the pixel portion is lowered, and the display appearance is deteriorated.

In addition, the influence of heat generated when the display panel is operated cannot be overlooked, and the heat generated by the display panel itself leads to a decrease in the appearance of the display as described above.

In view of the above problems, an object of the present invention is to provide a display device capable of suppressing the influence of heat of a semiconductor element on a display panel and the influence of heat generation of the display panel itself.

The present invention employs the following technical means in order to achieve the above object.

In the present invention, the circuit board (110) and
A display panel (120) arranged on one side of the circuit board to display an image,
In a display device provided on a circuit board and provided with a semiconductor element (130) for controlling an image display state of a display panel.
A heat insulating material (160) that blocks heat transferred from the semiconductor element to the display panel is provided on the circuit board side of the display panel, and is also provided.
A convection channel (161) that enables convection of air is provided at least on the display panel side of the heat insulating material .
In the first invention, the display surface of the display panel is arranged in a standing posture.
The convection is characterized by being formed by vertical grooves extending in the vertical direction and having lateral grooves (162) extending in a direction intersecting the vertical direction .
Further, in the second invention, a housing (140) for accommodating a circuit board, a display panel, and a semiconductor element is provided.
The housing is provided with an opening (143) that communicates with the convection flow path.
It is characterized in that air controlled to a predetermined temperature is supplied to the convection through the opening.

According to the present invention, the heat insulating material (160) can block the heat transferred from the semiconductor element (130) to the display panel (120), so that the heat insulating material (130) can be applied to the display panel (120). The influence of heat can be suppressed.

In addition, a convection (161) is provided at least on the display panel (120) side of the heat insulating material (160). Therefore, since the air that has received heat can be convected in the convection flow path (161) against the heat generated by the display panel (120) itself, the temperature of the display panel (120) can be made uniform as a whole. , It is possible to suppress the deterioration of the display appearance at the time of displaying an image.

The reference numerals in parentheses of each of the above means indicate the correspondence with the specific means described in the embodiment described later.

It is a perspective view which shows the appearance of the display device of 1st Embodiment. It is sectional drawing which shows the II-II part of FIG. It is a perspective view which shows the heat insulating material of 1st Embodiment. It is a perspective view which shows the heat insulating material of the modification 1 of 1st Embodiment. It is a perspective view which shows the heat insulating material of the modification 2 of 1st Embodiment. It is a perspective view which shows the appearance of the display device of 2nd Embodiment. It is sectional drawing which shows the VII-VII part of FIG. It is sectional drawing which shows the display device of 3rd Embodiment.

Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding forms, and duplicate explanations may be omitted. When only a part of the configuration is described in each form, other forms described above can be applied to the other parts of the configuration. Not only the combinations of the parts that clearly indicate that they can be combined in each embodiment, but also the parts of the embodiments that are not explicitly combined if there is no problem in the combination. It is also possible.

(First Embodiment)
The display device 100 of the first embodiment is shown in FIGS. 1 to 3. The display device 100 of the first embodiment is mounted on a vehicle, for example, to display the operating state of various vehicle devices and the like. The display device 100 is used as various vehicle devices such as a car navigation device, a car audio device, a car air conditioner device, a vehicle rear side display device, and the like. The display device 100 is attached to the dash boat of the vehicle so that the display surface 121 of the display panel 120 is in a standing posture (vertical direction), and the displayed image is visually recognized by a viewer (for example, a driver). It is supposed to be done.

As shown in FIGS. 1 and 2, the display device 100 includes a circuit board 110, a display panel 120, a semiconductor element 130, a housing 140, flexible wiring 150, a heat insulating material 160, and the like.

The circuit board 110 is made of, for example, a glass epoxy board or the like, and forms an electric circuit portion of the display device 100. The circuit board 110 is arranged inside a housing 140, which will be described later, and is supported (fixed) to the housing 140.

The display panel 120 is a display that displays an image of the operating state of various vehicle devices by emitting light of a plurality of pixels matrix-arranged on the display surface 121, and is arranged on one side of the circuit board 110 in the housing 140. It is supported (fixed) to the circuit board 110. The display panel 120 uses, for example, an organic EL (Electroluminescence) display having a layered structure using an organic compound. A predetermined gap is provided between the circuit board 110 and the display panel 120 for providing the heat insulating material 160, which will be described later. The display panel 120 is accompanied by some heat generation during operation.

The semiconductor element 130 is a control circuit unit that controls the image display state of the display panel 120 by controlling the energization of a plurality of pixels of the display panel 120. The semiconductor element 130 is mounted on the surface of the circuit board 110 opposite to the display panel 120. The semiconductor element 130 can be a heating element that generates more heat than the display panel 120 during operation.

The housing 140 is a flat container body that houses the circuit board 110, the display panel 120, and the semiconductor element 130. In the housing 140, a panel-side opening 142 is formed on the facing surface 141 facing the display surface 121 of the display panel 120, and most of the display panel 120 is exposed to the viewer side. Therefore, the facing surface 141 of the housing 140 is formed so as to substantially form a frame that covers the outer peripheral portion of the display panel 120.

The flexible wiring 150 is a printed wiring board with abundant flexibility, and electrically connects the circuit board 110 (semiconductor element 130) and the display panel 120.

The heat insulating material 160 is provided on the circuit board 110 side of the display panel 120, that is, in the gap (predetermined gap) between the display panel 120 and the circuit board 110, and is provided from the semiconductor element 130 via the circuit board 110 to the display panel. It is a member that blocks the heat transferred to the 120. The heat insulating material 160 has a plate shape, and is formed of, for example, foamed polyethylene, silicon sponge, urethane, or a resin film containing a large amount of air bubbles in the film.

In addition, as shown in FIG. 3, a plurality of vertical grooves 161 extending in the vertical direction are formed on the surface (at least the display panel 120 side) of the heat insulating material 160 on the display panel 120 side. The vertical groove 161 is, for example, a groove having a semicircular cross section. The plurality of flutes 161 form a convection flow path of the present invention, and air convection can occur in the space of the flutes 161 with a temperature change (particularly, a temperature rise). ing.

The configuration of the display device 100 of the present embodiment is as described above, and its operation and operation / effect will be described below.

When the viewer operates the display device 100 (for example, the switch is turned on), the light emitting state of each pixel on the display surface 121 of the display panel 120 is controlled by the semiconductor element 130, and a predetermined image is displayed.

During the operation of the display device 100, the semiconductor element 130 generates heat, for example, accompanied by a temperature rise of 100 ° C. or higher. On the other hand, although the display panel 120 also generates heat, the degree of heat generation is smaller than that of the semiconductor element 130, and the temperature rises by about 10 ° C.

When the temperature rise is accompanied by the temperature rise in the display panel 120 and the semiconductor element 130, the heat due to the temperature rise is mainly transferred from the semiconductor element 130 to the display panel 120 via the circuit board 110. Due to this heat transfer, the temperature of the display panel 120 rises. In particular, the amount of temperature rise near the position of the semiconductor element 130 becomes large, and a locally high temperature region (temperature distribution) is formed. In the display panel 120, as the temperature rises, the emission luminance in the pixels decreases, and the appearance of the displayed image deteriorates.

In the present embodiment, the heat insulating material 160 is provided on the circuit board 110 side of the display panel 120, and the heat insulating material 160 blocks the heat transferred from the semiconductor element 130 to the display panel 120 via the circuit board 110. Therefore, it is possible to suppress the influence of heat on the display panel 120 by the semiconductor element 130.

In addition, a convection (vertical groove 161) is provided at least on the display panel 120 side of the heat insulating material 160, so that the heated air can be convected in the convection against the heat generated by the display panel 120 itself. Therefore, the temperature of the display panel 120 can be made uniform as a whole, and deterioration of the display appearance at the time of displaying an image can be suppressed.

Further, the display surface 121 of the display panel 120 is arranged in a standing posture, and the convection is formed by a vertical groove 161 extending in the vertical direction. Since the movement of the convection of the endothermic air moves in the vertical direction as the density changes, effective convection can be generated by forming the convection groove 161 extending in the vertical direction as described above. Can be done.

(Modification 1 of the first embodiment)
FIG. 4 shows the heat insulating material 160a in the first modification of the first embodiment. The heat insulating material 160a in the first modification is obtained by changing the shape of the convection with respect to the heat insulating material 160 of the first embodiment.

The convection of the heat insulating material 160a has a plurality of horizontal grooves 162 extending in the left-right direction in addition to the vertical grooves 161. That is, the convection flow path of the heat insulating material 160a is formed of the vertical groove 161 and the horizontal groove 162, and both grooves 161 and 162 intersect each other to form a mesh as a whole. The left-right direction in the lateral groove 162 corresponds to a direction intersecting the vertical direction of the present invention.

In the present modification 1, the lateral groove 162 makes it possible to generate convection in the left-right direction, and the effect of temperature equalization by convection can be improved.

(Modification 2 of the first embodiment)
The heat insulating material 160b in the second modification of the first embodiment is shown in FIG. The heat insulating material 160b in the second modification is obtained by changing the shape of the convection with respect to the heat insulating material 160 of the first embodiment.

In the heat insulating material 160b, by providing a plurality of convex portions 163 arranged vertically and horizontally at predetermined intervals on the surface on the display panel 120 side, the convex portions 163 and the convex portions 163 are relatively recessed. It is designed to be a recess. This recess serves as the convection in the second modification. By arranging the convex portions 163 vertically and horizontally, the concave portions extend vertically and horizontally, respectively, and are substantially the same as those of the first modification. Therefore, in the present modification 2, the same effect as that of the modification 1 can be obtained.

As the ultimate form of the second modification, the convex portions 163 may be arranged at the four corners of the heat insulating material 160b. In this case, a substantially flat plate-shaped space is formed between the display panel 120 and the circuit board 110, and this space can be used as a convection, and the generation of convection can be promoted.

(Second Embodiment)
The display device 100A of the second embodiment is shown in FIGS. 6 and 7. The display device 100A of the second embodiment is provided with a convection opening 143 in the housing 140 with respect to the display device 100 of the first embodiment. The convection opening 143 corresponds to the opening of the present invention.

The convection opening 143 is a hole that communicates from the outside of the housing 140 to the internal vertical groove 161 (convection flow path), and in the longitudinal direction of each of the plurality of vertical grooves 161 on the upper surface and the lower surface of the housing 140. It is provided so as to correspond to the end position of.

In the present embodiment, the convection opening 143 allows the convection (vertical groove 161) to communicate with the outside of the housing 140, so that the generation of convection in the convection can be effectively promoted.

(Modified example of the second embodiment)
With respect to the second embodiment, air controlled to a predetermined temperature is supplied to the convection channel (vertical groove 161) from the convection opening 143 on either the upper surface or the lower surface of the housing 140. May be good. As the air controlled to a predetermined temperature, for example, temperature-controlled air blown into the vehicle interior by a vehicle air conditioner can be used.

As a result, the temperature of the air in the convection (vertical groove 161) can be controlled to a predetermined temperature, and the temperature of the display panel 120 can be suitably controlled.

(Third Embodiment)
The display device 100B of the third embodiment is shown in FIG. The display device 100B of the third embodiment is a heat insulating material 160c by adding a convection of the heat insulating material 160 to the display device 100 of the first embodiment.

When the convection (longitudinal groove 161) described in the first embodiment is used as the first convection, in the present embodiment, the vertical groove 164 is also added to the circuit board 110 side of the heat insulating material 160c. Two convection channels are provided.

As a result, air can be convected even in the second convection channel (vertical groove 164), so that the temperature of the circuit board 110 including the semiconductor element 130 can be made uniform.

(Other embodiments)
In each of the above embodiments, the semiconductor element 130 is provided on the circuit board 110 on the side opposite to the display panel 120, but may be provided on the display panel 120 side of the circuit board 110.

Further, in each of the above embodiments, it has been described that an organic EL display is used as the display panel 120, but the present invention is not limited to this, and for example, a TFT (Thin Film Transistor) liquid crystal display using a thin film transistor is used. Other display panels such as a display may be used.

Further, in each of the above embodiments, the display devices 100, 100A, and 100B have been described as being mounted on a vehicle, but the present invention is not limited to this, and is applied to televisions, displays, and the like used in facilities, homes, and the like. May be.

100, 100A, 100B Display device 110 Circuit board 120 Display panel 130 Semiconductor element 140 Housing 143 Convection opening (opening)
160, 160a, 160b, 160c Insulation 161 flutes (vs. convection, first convection)
162 Horizontal groove (convection)
164 flutes (second convection)

Claims (6)

Circuit board (110) and
A display panel (120) arranged on one side of the circuit board to display an image,
In a display device provided on the circuit board and provided with a semiconductor element (130) for controlling an image display state of the display panel.
A heat insulating material (160) that blocks heat transferred from the semiconductor element to the display panel is provided on the circuit board side of the display panel, and is also provided.
A convection channel (161) capable of generating air convection is provided at least on the display panel side of the heat insulating material.
The display surface of the display panel is arranged in a standing posture.
The convection is a display device having a vertical groove extending in the vertical direction and a horizontal groove (162) extending in a direction intersecting the vertical direction . A housing (140) for accommodating the circuit board, the display panel, and the semiconductor element is provided.
The display device according to claim 1 , wherein the housing is provided with an opening (143) communicating with the convection flow path. The display device according to claim 2 , wherein air controlled to a predetermined temperature is supplied to the convection through the opening. Circuit board (110) and
A display panel (120) arranged on one side of the circuit board to display an image,
In a display device provided on the circuit board and provided with a semiconductor element (130) for controlling an image display state of the display panel.
A heat insulating material (160) that blocks heat transferred from the semiconductor element to the display panel is provided on the circuit board side of the display panel, and is also provided.
A convection channel (161) capable of generating air convection is provided at least on the display panel side of the heat insulating material.
A housing (140) for accommodating the circuit board, the display panel, and the semiconductor element is provided.
The housing is provided with an opening (143) that communicates with the convection.
A display device in which air controlled to a predetermined temperature is supplied to the convection through the opening . The display surface of the display panel is arranged in a standing posture.
The display device according to claim 4 , wherein the convection is formed by a vertical groove extending in the vertical direction. When the convection is the first convection,
The display device according to any one of claims 1 to 5, wherein a second convection (164) similar to the first convection is provided on the circuit board side of the heat insulating material.

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