JP2015018187A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that can effectively radiate the heat inside the device while reducing the thickness of the device.SOLUTION: A display device 11 includes a display device main body 12, a decorative plate 13, and a heat conductive sheet 48. The display device main body 12 includes a liquid crystal display element 15 that can display images, and a back light 16 that supplies planar light to the liquid crystal display element 15. The decorative plate 13 includes a metallic film 46 and is bonded to the display side of the liquid crystal display element 15 of the display device main body 12. The heat conductive sheet 48 thermally connects the metallic film 46 with a light emitting part 37 of the back light 16 of the display device main body 12.

Description

  Embodiments described herein relate generally to a display device including a display element capable of displaying an image.

  Conventionally, a liquid crystal display device (LCD) with a touch sensor function is used as a portable terminal such as a mobile phone, a smartphone, or a tablet PC. In such a liquid crystal display device, a decorative plate having a touch sensor function is bonded to a liquid crystal display element (liquid crystal panel) that is a display element that is irradiated with planar light from a backlight that is a planar light source device. It consists of

  In particular, mobile phones and smartphones are becoming thinner, lighter, higher brightness, and larger screens. For this reason, internal components are also becoming thinner, smaller, and more advanced, and by suppressing the heat emitted from each component or dissipating those heat, It is required to suppress the temperature of

  For example, it is conceivable to attach a heat dissipation sheet to the back surface of the backlight that generates heat particularly in the light source (light emitting part), or to attach a heat dissipation sheet to a component that generates heat.In these cases, sufficient heat dissipation is obtained. Therefore, there is a possibility that the heat dissipation sheet becomes large.

JP 2013-109143 A

  The problem to be solved by the present invention is to provide a display device capable of effectively dissipating internal heat while corresponding to a reduction in thickness.

  The display device of the embodiment includes a display device main body, a decorative board, and a heat conductive sheet. The display device body includes a display element that can display an image and a planar light source device that supplies planar light to the display element. The decorative plate includes a metal film and is bonded to the display side of the display element of the display device body. The thermally conductive sheet thermally connects the metal film and the heat generating part of the display device body.

It is explanatory sectional drawing which shows typically the II equivalent position of FIG. 2 of the display apparatus of one Embodiment. It is a perspective view which expands and shows a part of display apparatus same as the above. (a) is the perspective view which shows a display apparatus same as the above from the display side, (b) is the perspective view which shows the same display apparatus from the non-display side.

  Hereinafter, the configuration of an embodiment will be described with reference to FIGS. 1 to 3.

  1 to 3, reference numeral 11 denotes a display device. The display device 11 is a liquid crystal display device mounted on various portable terminals such as a mobile phone and a smartphone.

  The display device 11 includes a display device body 12 and a decorative board 13 bonded to the display device body 12.

  The display device main body 12 is a liquid crystal display element (LCD panel) 15 as a display element, and a surface light source device that is disposed opposite to the back side that is the opposite side of the liquid crystal display element 15 and supplies surface light. And a backlight 16. The liquid crystal display element 15 and the backlight 16 are bonded and fixed to each other via a double-sided tape 17.

  The liquid crystal display element 15 is, for example, an active matrix type transmissive (or transflective) liquid crystal panel module, and includes an array substrate 21 and a counter substrate 22 disposed to face the array substrate 21 with a predetermined gap therebetween. The liquid crystal layer 23 is a light modulation layer interposed between the substrates 21 and 22, and the polarizing plates 24 and 25 are attached to the substrates 21 and 22, respectively. The liquid crystal display element 15 has a plurality of pixels in a matrix between the array substrate 21 and the counter substrate 22, and these pixels are arranged in, for example, a rectangular display region 27. These pixels are configured to be driven through a driver (not shown) which is an IC mounted on the array substrate 21 or the like, for example. This driver is electrically connected to an external circuit via a connection board 29 such as a flexible printed circuit board (FPC). The liquid crystal display element 15 can display an image or the like in the display region 27 by changing the transmittance of visible light from the backlight 16 for each pixel by driving the pixel.

  The backlight 16 includes a light source 31, a light guide plate 32 that is a light guide that converts light from the light source 31 into planar light, and a liquid crystal display element 15 that is a display side of the light guide plate 32 and is not illustrated. A plurality of optical sheets, a reflection sheet 34 superimposed on the non-display side (rear side) of the light guide plate 32, a frame 35 for accommodating these, and the like are provided.

  The light source 31 includes a light emitting unit 37 as a plurality of heat generating units such as a light emitting diode (LED) and a light source substrate 38 such as a flexible printed circuit board (FPC) on which the light emitting units 37 are mounted.

  The light emitting unit 37 makes light incident on the light guide plate 32, is electrically connected to an external circuit through the light source substrate 38, and lighting is controlled by the external circuit.

  The light source substrate 38 is positioned on the display side, that is, the liquid crystal display element 15 side with respect to the light emitting unit 37, covers the light emitting unit 37, and is fixed to the frame 35.

  The light guide plate 32 is formed in a substantially rectangular flat plate shape by a synthetic resin having translucency such as acrylic. The light guide plate 32 has an end surface facing the light emitting portion 37 serving as an incident surface 32a on which light from the light emitting portion 37 is incident, and one main surface facing the liquid crystal display element 15 is configured to transmit planar light. The light emitting surface 32b irradiates the back side (array substrate 21 side) of the display element 15, and the other main surface on the anti-liquid crystal display element 15 side is a refractive surface 32c. The exit surface 32b is covered with an optical sheet, and the refracting surface 32c is covered with a reflective sheet.

  The optical sheet is to uniformize the light emitted from the emission surface 32b of the light guide plate 32.

  The reflection sheet 34 refracts (reflects) leaked light from the refracting surface 32c and re-enters the light guide plate 32.

  On the other hand, the decorative plate 13 is a protective cover that protects the display device 11, and improves the design of the display device 11 by performing various types of printing. This decorative board 13 is a decorative board main body 41 formed in a thin plate shape with transparent glass (transmitting visible light) or synthetic resin, etc., and is formed on the back side of the decorative board main body 41 to prevent leakage light. The light shielding layer 42 and the touch sensor unit 43 to be blocked, various print layers (not shown), the protective film 44 that covers and protects the light shielding layer 42, the touch sensor unit 43, and the print layer, and a part of the protective film 44 A metal film 46 exposed through an opening 45 opened at a position outside the display area 27 is provided.

  The touch sensor unit 43 has a known configuration such as a capacitive type that detects the touch position of the user by detecting the capacitance that changes due to the approach or contact of a fingertip or the like. The touch sensor unit 43 includes a part of a metallic transparent electrode (not shown). That is, the touch sensor unit 43 is partially made of metal. The touch sensor unit 43 is electrically connected to an external circuit via a circuit board 47 connected to the decorative board body 41, and is controlled by the external circuit.

  The metal film 46 is formed, for example, in the form of a surface having a predetermined area by the same process and the same material when forming a metal part such as an electrode of the touch sensor part 43, and is a thermally conductive member. The light source 31 of the backlight 16 of the display device body 12 is thermally connected through a heat conductive sheet (thermal conductive tape) 48 as the above. The thermally conductive sheet 48 includes a thermally conductive sheet main body 48a attached in a planar shape to the light source substrate 38 at a position facing the light emitting portion 37, and a connecting arm projecting in an arm shape from the thermally conductive sheet main body 48a. 48b is integrally provided, and the heat conductive sheet main body 48a is attached to the liquid crystal display element 15 side of the light source substrate 38 of the light source 31, and is thermally connected to the light source 31, and the connecting arm portion 48b is a light source. It protrudes outward from 31 and extends, and the tip of the connecting arm portion 48b is attached to the metal film 46 exposed from the opening 45 and is thermally connected to the metal film 46.

  Next, the operation of the one embodiment will be described.

  In the display device 11, when the light emitting unit 37 of the light source 31 emits light according to a signal from an external circuit, the emitted light enters the light guide plate 32 from the incident surface 32a of the light guide plate 32, and is reflected by the refractive surface 32c and the reflection sheet 34. The light is refracted and reflected to be converted into a planar shape, and exits from the exit surface 32b. Thereafter, the light is made uniform through the optical sheet and irradiated to the back side of the liquid crystal display element 15. In the liquid crystal display element 15, the amount of transmission (blocking amount) of planar light from the backlight 16 is set in the display area 27 by each pixel driven corresponding to the image signal input from the external circuit. The image is displayed on the observer side.

  The heat generated by the light emission of the light emitting portion 37 of the light source 31 in the backlight 16 is transmitted to the heat conductive sheet main body 48a of the heat conductive sheet 48 via the light source substrate 38, and this heat conductive sheet main body 48a. Is transmitted to the metal film 46 through the connection arm portion 48b. Accordingly, heat is diffused into the metal film 46 and is radiated through the decorative plate body 41 on which the metal film 46 is formed.

  According to the embodiment described above, the metal film 46 provided on the decorative plate 13 and the light emitting portion 37 of the light source 31 that is the heat generating portion of the display device body 12 are thermally connected by the heat conductive sheet 48. Therefore, compared with the case where, for example, a heat-dissipating sheet is attached to the light emitting portion 37, the area of the decorative plate 13 is effectively used, and the decorative plate body 41 having a larger area than the metal film 46 and the metal film 46. Can dissipate heat. Therefore, it is possible to effectively dissipate the heat inside the display device 11 while supporting the reduction in thickness without increasing the thickness of the display device 11.

  Further, as the decorative plate 13, a metal film 46 is formed on the metal portion of the touch sensor unit 43 (film formation) by using a decorative plate 13 that includes a touch sensor unit 43 that is at least partially formed of metal and detects touch input. And patterning), and can be formed using the same material. Therefore, a process for forming the metal film 46 is not required separately, and the manufacturing cost can be further suppressed.

  Furthermore, by dissipating heat from the light emitting part 37 provided in the light source 31 of the backlight 16 by the heat conductive sheet 48, even if the light emitting part 37 using a light emitting diode or the like generates a lot of heat, it is more than necessary. The inside does not get hot. Therefore, the light emitting unit 37 using a light emitting diode that is small and suppresses power consumption can be applied to the display device 11, and the display device 11 can be further reduced in size and power consumption.

  And since the heat generated from the light emitting part 37 of the light source 31 is transmitted to the metal film 46 side by the heat conductive sheet 48 and can be effectively dissipated by the decorative board 13, the number of mounted light emitting parts 37 of the light source 31 is increased. In addition, the components on the light source substrate 38 can be further miniaturized and the mounting density can be increased. For example, it can be made thinner and lighter for portable terminals such as mobile phones and smartphones. .

  In the above embodiment, the thermally conductive sheet 48 may be thermally connected to the metal film 46 and an IC such as a driver that is mounted on the array substrate 21 and drives the liquid crystal display element 15, for example. The circuit mounted (formed) on the connection substrate 29 of the liquid crystal display element 15 and the metal film 46 may be thermally connected.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

11 Display device
12 Display unit
13 veneer
15 Liquid crystal display elements as display elements
16 Backlight as a planar light source device
31 Light source
32 Light guide plate as light guide
37 Light-emitting part as a heat-generating part
43 Touch sensor
46 Metal film
48 Thermal conductive sheet

Claims (3)

A display device body including a display element capable of displaying an image and a planar light source device for supplying planar light to the display element;
A decorative plate provided with a metal film and bonded to the display side of the display element of the display device body;
A display device comprising: a heat conductive sheet for thermally connecting the metal film and a heat generating portion of the display device body. The display device according to claim 1, wherein the decorative plate includes a touch sensor unit that is formed at least in part from metal and detects a touch input. The planar light source device includes a light source and a light guide that converts light from the light source into planar light,
The display device according to claim 1, wherein the heat generating unit is a light emitting unit provided in the light source.

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