JP2015012476A - Display device, electronic view finder, and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device, an electronic view finder, and a camera capable of efficiently radiating heat.SOLUTION: A display device 61 comprises: a self-emitting display element 63; and a substrate 64 comprising a heat conduction layer 66, where the display element 63 is bonded; and a connection part where the heat conduction layer 66 is exposed on a periphery of the substrate 64, and which can connect with a part to be connected.

Description

  The present invention relates to a display device, an electronic viewfinder, and a camera.

  The organic EL element is expected to be applied to an electronic viewfinder of a camera as a thin and light self-emitting element. However, the organic EL element has a problem that heat is generated at the time of light emission, and the light emission characteristics change when used for a long time. For this reason, conventionally, a graphite sheet or a metal plate is brought into direct contact with the organic EL element to release heat from the panel (see Patent Document 1).

JP 2010-231979 A

However, in the above prior art, it is not considered where the heat accumulated in the metal is released. The amount of heat that can be released from the organic EL element to a metal plate or the like is determined by the heat capacity of the metal. In particular, when considering the use of an organic EL element in a camera finder or the like, since the inside of the camera is a sealed space, almost no air cooling can be expected, and heat dissipation is mainly performed by heat transfer.
Unless heat dissipation from the organic EL element is taken into account, when light is emitted for a long time, heat is saturated even with metal, and the life of the organic EL element is eventually shortened due to heat damage. For this reason, image sticking may occur in the local area of the organic EL element.
When an organic EL element is used in a camera finder or the like, photographing information such as ISO sensitivity and shutter speed may be burned, which is a problem when the organic EL element is used as a finder.

  An object of the present invention is to provide a display device, an electronic viewfinder, and a camera that can efficiently dissipate heat.

  The present invention solves the above problems by the following means.

The invention according to claim 1 includes a display element that emits light and a substrate having a heat conductive layer and bonded to the display element, and the heat conductive layer is exposed at an outer peripheral portion of the substrate. And the connection part which can be connected to a to-be-connected part is provided, It is a display device characterized by the above-mentioned.
A second aspect of the present invention is the display device according to the first aspect, wherein the substrate is a metal core substrate.
A third aspect of the present invention is the display device according to the first or second aspect, wherein the display element is an organic electroluminescence element.
A fourth aspect of the present invention is an electronic viewfinder including the display device according to any one of the first to third aspects.
A fifth aspect of the present invention is a camera including the display device according to the first to third aspects.

  According to the present invention, it is possible to provide a display device, an electronic viewfinder, and a camera that can efficiently dissipate heat.

It is a figure which shows schematic structure of the camera provided with the display apparatus of embodiment. It is the schematic of a display apparatus.

Hereinafter, an embodiment of the display device 61 of the present invention will be described with reference to the drawings and the like.
FIG. 1 is a diagram illustrating a schematic configuration of a camera 1 including a display device 61 according to the embodiment. FIG. 2 is a schematic diagram of the display device 61.
As shown in FIG. 1, the camera 1 includes a photographic lens 10, an image sensor 20, an operation unit 40, a finder 60, a control unit 70, and the like.
In this embodiment, the camera 1 in which the photographing lens 10 is integrated with the camera body will be described. However, the present invention is not limited to this. For example, a mirrorless camera or a single-lens reflex camera can be used. There may be.

  The photographing lens 10 is formed by a plurality of lens groups including, for example, a focus lens and a zoom lens. The plurality of lens groups are arranged along the direction of the optical axis OA. A part of the photographic lens 10 is moved back and forth in the direction of the optical axis A by a lens driving unit 11 including an actuator and the like. The taking lens 10 forms a subject image on the image sensor 20.

The imaging element 20 is a photoelectric conversion element that converts subject light that has passed through the photographing lens 10 into an electrical signal and outputs the electrical signal.
The operation unit 40 is a member that is operated by a user of the camera 1 such as a photographer. For example, a power button that is operated when the camera 1 is turned on or off, or when the camera 1 performs a photographing operation. Includes release button to operate.

  The finder 60 is an EVF (Electronic View Finder) in the present embodiment, and is used for observing a subject image when a photographer determines a photographing composition (during framing). The finder 60 includes the display device 61 of the present embodiment, and the configuration thereof will be described in detail later.

  The control unit 70 is a part that comprehensively controls each electrical element provided in the camera 1 and includes an arithmetic device such as a CPU. The control unit 70 includes a signal processing circuit that generates image data based on the output (electrical signal) of the image sensor 20.

  Next, the configuration of the finder 60 provided in the camera 1 will be described. As shown in FIG. 1, the finder 60 includes a display device 61 and a lens group 62 group.

  The lens group 62 is a lens disposed on the front side in the observation direction with respect to the display device 61, and an image displayed on the display device 61 is an image suitable for observation.

  As shown in FIG. 2, the display device 61 includes an organic EL element 63, a metal core substrate 64 to which the organic EL element 63 is bonded, and a cover portion 63 a that covers the organic EL element 63.

The organic EL element 63 has a structure in which an organic thin film is sandwiched between an anode and a cathode. When a direct current voltage is applied to the organic EL element, holes are injected from the anode and electrons are injected from the cathode. As a result, holes and electrons are combined to generate energy.
A light emission phenomenon occurs when the energy generated at this time excites the organic material and returns from the excited state to the ground state. This light emission generates an image picked up by the image pickup device, and enables a through image display when the photographer performs framing.
The through image means a moving image generated in substantially real time by the signal processing circuit based on the output of the image sensor 20 during framing, and the photographer observes the through image (subject image) displayed on the finder 60. It is possible to perform framing while doing so.

  The cover part 63a covers the side of the organic EL element 63 opposite to the metal core substrate 64, and has a function of preventing the adhesion of dust and the like to the organic EL element 63 and protecting the organic EL element 63.

  The metal core substrate 64 applies a voltage to the organic EL element 63 based on a signal from the control unit 70. The metal core substrate 64 is a three-layered substrate in which a metal plate is sandwiched between two substrates. From the organic EL element 63 side, a first substrate 65 to which the organic EL element 63 is bonded, a metal plate 66, And a second substrate 67. The metal material is, for example, aluminum or copper. In addition, in this invention, it is not limited to a metal plate, For example, a graphite sheet etc. which have heat conductivity may be sufficient.

The second substrate 67 has substantially the same shape as the metal plate 66, but the first substrate 65 is smaller than the metal plate 66, and when the metal core substrate 64 is viewed from the first substrate 65 side, the first substrate 65 is on the surface of the metal plate 66. There is a portion that is not covered by the substrate 65, and the portion is an exposed portion 68.
In the exposed portion 68, the metal core substrate 64 has a two-layer structure of a metal plate 66 and a second substrate 67 and is provided with a through hole 69.

On the other hand, in order to attach the display device 61 to the camera, a metal wall portion 30 is provided on a chassis or a frame housing. The wall portion 30 is provided with an opening 32 larger than the first substrate 65, and is aligned with the position of the through hole 69 of the exposed portion 68 when the first substrate 65 is disposed in the opening 32. A screw hole 31 is provided.
Then, the display device 61 is fixed to the wall portion 30 by bringing the exposed portion 68 of the display device 61 into contact with the wall portion 30 and screwing the metal screw 33 into the through hole 69 and the screw hole 71. .

According to this embodiment, the metal plate 66 and the metal wall 30 of the housing of the camera 1 are in contact. Therefore, as indicated by an arrow in FIG. 2, the heat generated in the organic EL element 63 is radiated to the wall portion 30 of the camera 1 through the metal plate 66 without entering the panel.
Thereby, the heat generated when the organic EL element 63 is used as a finder is efficiently released to the outside. Therefore, it is possible to prevent the life of the organic EL element from being shortened due to heat damage, and to prevent image sticking in the local area of the organic EL element.

  1: camera, 60: finder, 61: display device, 62: lens group, 63: organic EL element, 64: metal core substrate, 65: first substrate, 66: metal plate, 67: second substrate, 68: exposed portion 69: Through hole 71: Hole

Claims (5)

A self-luminous display element;
A substrate having a heat conductive layer and the display element bonded thereto,
A connection part that is exposed to the heat conductive layer and is connectable to the connected part is provided on the outer periphery of the substrate.
A display device. The display device according to claim 1,
The substrate is a metal core substrate;
A display device. The display device according to claim 1 or 2,
The display element is an organic electroluminescence element;
A display device.   An electronic viewfinder comprising the display device according to any one of claims 1 to 3.   A camera comprising the display device according to claim 1.

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