Patent Description:
With the development of technology, the demand for display devices is gradually increasing. In recent years, different types of display devices have been used, such as liquid crystal displays (LCDs), plasma display panels (PDPs), organic light emitting display (OLED) and the like. The light source module inside the display device is mainly to provide illumination of the display device.

Taking a liquid crystal display as an example, it generally includes a liquid crystal cell, a backlight module and a casing. A light source of the backlight module could be a line source or a point source, and light emitted by the source is converted into a high brightness and uniform surface light when passing through a light guide plate. Heat generated by the light source of the backlight module is transferred toward the casing of the liquid crystal display and then accumulated inside the casing.

US patent publication <CIT> is directed to a heat exchanger for back to back electronic displays. A cooling assembly for a dual electronic image assembly having two gas pathways. The first gas pathway allows circulating gas to travel across the front surface of a pair of electronic image assemblies and through a heat exchanger. The second gas pathway allows ambient gas to pass through the heat exchanger and extract heat from the circulating gas. The first and second gas pathways are connected. A fan assembly is placed so that the circulating gas will be forced through the first gas pathway.

US patent publication <CIT> is directed to a liquid crystal display device. The liquid crystal display device includes: a liquid crystal cell, an optical sheet, and a backlight disposed; a heat absorber; and a heat sink. The heat absorber is disposed in an airtight circulation channel and cools a coolant that circulates in the airtight circulation channel so as to pass through a first channel between the liquid crystal cell and the optical sheet and a second channel between the optical sheet and the backlight. The heat sink is thermally coupled to the heat absorber and exposed to ambient air. The backlight is between the heat absorber and the heat sink. The heat absorber and the heat sink are separate elements.

According to one aspect of the disclosure, a heat exchanger for an electronic device including a light module is provided. The heat exchanger includes: an internal heat exchange portion; an external heat exchange portion; and a flow generator. The internal heat exchange portion is configured to be adjacently attached to the light module. The internal heat exchange portion includes at least one internal heat dissipation channel. The internal heat dissipation channel is connected with a device space of the electronic device. A high temperature gas flow generated by the electronic device is enabled to pass through the device space and the internal heat dissipation channel. The external heat exchange portion is in thermal contact with the internal heat exchange portion. The external heat exchange portion includes an external heat dissipation structure. The external heat dissipation structure is non-connected with the at least one internal heat dissipation channel. The at least one internal heat dissipation channel is provided between the external heat dissipation structure and the light module. The flow generator corresponds to the external heat exchange portion. An ambient air flow is enabled to pass through the external heat dissipation structure.

In one embodiment of the disclosure, the external heat dissipation structure includes at least one external heat dissipation channel, and the ambient air flow is enabled to pass through the external heat dissipation channel.

In one embodiment of the disclosure, the external heat dissipation structure includes a plurality of heat sink fins, and the ambient air flow is enabled to pass through the heat sink fins.

In one embodiment of the disclosure, the internal heat exchange portion includes an inner side surface facing toward the light module, and the external heat exchange portion includes an outer side surface opposite to the inner side surface. The internal heat dissipation channel and the at least one external heat dissipation channel are located between the inner side surface and the outer side surface.

In one embodiment of the disclosure, both a number of the at least one internal heat dissipation channel and a number of the at least one external heat dissipation channel are multiple.

In one embodiment of the disclosure, a sum of cross sectional areas of the internal heat dissipation channels and the external heat dissipation channels is <NUM>% to <NUM>% of a sum of cross sectional areas of the internal heat exchange portion and the external heat exchange portion.

In one embodiment of the disclosure, the heat exchanger includes a plurality of heat sink fins disposed in at least one of the internal heat dissipation channel and the external heat dissipation channel.

In one embodiment of the disclosure, the electronic device include a display device, and the light module includes a backlight module of the display device. A display device includes: casing, a cover, a display assembly, a first flow generator, the flow generator, and the heat exchanger. The casing includes a display portion and a rear portion opposite to each other. The cover is disposed on the casing. The display assembly includes a display unit and the backlight module. The display unit is exposed to outside by the display portion. The first flow generator is disposed in the casing. The flow generator is disposed on the cover. The heat exchanger is disposed on the rear portion of the casing. The internal heat exchange portion is configured to be adjacently attached to the backlight module of the display assembly. The backlight module is in thermal contact with the internal heat exchange portion. The at least one internal heat dissipation channel is connected with an assembly space of the display assembly. The first flow generator corresponds to the at least one internal heat dissipation channel. the high temperature gas flow generated by the display assembly is enabled to pass through the assembly space and the at least one internal heat dissipation channel.

In one embodiment of the disclosure, the display assembly further includes a chamber. The chamber is located between the display unit and the backlight module, and the chamber has the assembly space.

The present disclosure will become more understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only and thus are not limitative of the present disclosure and wherein:.

In other instances, well-known structures and devices are schematically shown in order to simplify the drawings.

Please refer to <FIG> are schematic views of an electronic device including a light module and a heat exchanger according to an embodiment of the present disclosure. A heat exchanger <NUM> is able to be adjacently attached to a light module LM of an electronic device ED for improving the heat dissipation of the electronic device ED, and the electronic device ED may be a display device or an illumination device. Under a condition that the electronic device ED is a display device, the light module LM is a backlight module; and under a condition that the electronic device ED is an illumination device, the light module LM is a lighting source.

Further, the heat exchanger <NUM> includes an internal heat exchange portion <NUM> and an external heat exchange portion <NUM>.

The internal heat exchange portion <NUM> is configured to be adjacently attached to a rear surface of the light module LM (that is, a surface far away from a luminous surface), and the internal heat exchange portion <NUM> has at least one internal heat dissipation channel <NUM>. The at least one internal heat dissipation channel <NUM> is connected with a device space ES of the electronic device ED; that is, a high temperature gas flow HF generated by the electronic device ED is enabled to pass through the device space ES and the at least one internal heat dissipation channel <NUM>. Moreover, the number of the internal heat dissipation channel <NUM> may be one or more than one, and multiple heat sink fins F1 may be disposed in the at least one internal heat dissipation channel <NUM>.

The external heat exchange portion <NUM> is in thermal contact with the internal heat exchange portion <NUM>. The external heat exchange portion <NUM> has an external heat dissipation structure OS non-connected with the at least one internal heat dissipation channel <NUM>; that is, the gas flow (for example, the high temperature gas flow HF) passing through the at least one heat dissipation channel <NUM> does not flow into the external heat dissipation structure OS, and the gas flow (for example, an ambient air flow) passing through the external heat dissipation structure OS does not flow into the at least one internal heat dissipation channel <NUM>. In one embodiment, the external heat dissipation structure OS has at least one external heat dissipation channel <NUM> non-connected with the at least one heat dissipation channel <NUM>. In another embodiment, the external heat dissipation structure OS has at least one external heat dissipation channel <NUM> in which multiple heat sink fins F1 are disposed. In still another embodiment, the external heat dissipation structure OS includes multiple heat sink fins F2.

Various aspects of the heat exchanger <NUM> are illustrated in the following paragraphs.

As shown in <FIG>, the number of the internal heat dissipation channel <NUM> is multiple (take five internal heat dissipation channels as example). The external heat dissipation structure OS has at least one external heat dissipation channel <NUM>, and the number of the external heat dissipation channel <NUM> is five as an exemplary illustration. The internal heat exchange portion <NUM> has an inner side surface <NUM> facing toward the light module LM. The external heat exchange portion <NUM> has an outer side surface <NUM> opposite to the inner side surface <NUM>. Both the at least one internal heat dissipation channel <NUM> and the at least one external heat dissipation channel <NUM> are located between the inner side surface <NUM> and the outer side surface <NUM>.

As shown in <FIG>, the number of the internal heat dissipation channel <NUM> is five as an exemplary illustration. The external heat dissipation structure OS includes multiple heat sink fins F2.

As shown in <FIG>, the number of the internal heat dissipation channel <NUM> is one as an exemplary illustration. The heat exchanger <NUM> further includes multiple heat sink fins F1 disposed in the internal heat dissipation channel <NUM>, and the external heat dissipation structure OS includes multiple heat sink fins F2.

As shown in <FIG>, the number of the internal heat dissipation channel <NUM> is one as an exemplary illustration. The heat exchanger <NUM> further includes multiple heat sink fins F1 disposed in the internal heat dissipation channel <NUM>, and the external heat dissipation structure OS has at least one external heat dissipation channel <NUM>. In this embodiment, the number of the external heat dissipation channel <NUM> is one as an exemplary illustration. The heat exchanger <NUM> further includes multiple heat sink fins F1 disposed in the external heat dissipation channel <NUM>.

It is noted that the heat exchangers <NUM> shown in <FIG> are exemplary, and the present disclosure is not limited to the configuration of the heat exchangers <NUM>.

In order to describe the heat dissipation mechanism of the heat exchanger <NUM> more specifically, the heat exchanger <NUM> is applied to a display device for example. In the following paragraphs, both the number of internal heat dissipation channel <NUM> of the internal heat exchange portion <NUM> and the number of external heat dissipation structure OS of the external heat exchange portion <NUM> are multiple as exemplary illustration.

Please refer to <FIG> and <FIG>. <FIG> is a perspective view of a display device according to a first embodiment of the present disclosure. <FIG> is an exploded view of the display device in <FIG>. In this embodiment, a display device <NUM> includes a casing <NUM>, a display assembly <NUM> and a heat exchanger <NUM>. In this embodiment, the display device <NUM> is a direct LED.

The casing <NUM> includes a display portion <NUM> and a rear portion <NUM> opposite to each other. The display portion <NUM> has a displaying opening <NUM>, and the rear portion <NUM> has a mounting opening <NUM>. The casing <NUM> further has an accommodation space <NUM> connected with the displaying opening <NUM> and the mounting opening <NUM>.

The display assembly <NUM> is disposed in the accommodation space <NUM> of the casing <NUM>. The display assembly <NUM> includes a display unit <NUM> and a backlight module <NUM>. The display unit <NUM> includes a liquid cell layer <NUM> and a cover glass <NUM>. The cover glass <NUM> is disposed in the displaying opening <NUM> of the display portion <NUM> of the casing <NUM>, and the liquid cell layer <NUM> is exposed to outside by the displaying opening <NUM>. The backlight module <NUM> includes an optical film <NUM> and a light source <NUM>, and the optical film <NUM> may include diffuser film, brightness enhancement film or the like. Moreover, the display assembly <NUM> further includes a chamber <NUM> between the display unit <NUM> and the backlight module <NUM>, and the chamber <NUM> has an assembly space <NUM>. The assembly space <NUM> is connected with the accommodation space <NUM> of the casing <NUM>.

The heat exchanger <NUM> is disposed on the casing <NUM>. Please further refer to <FIG>. <FIG> is a perspective view of a heat exchanger of the display device in <FIG>. <FIG> is a cross sectional view of the heat exchanger in <FIG> along line A-A. <FIG> is a cross sectional view of the display device in <FIG>.

The display device <NUM> further includes multiple flow generators <NUM>. The flow generators <NUM>, for example, are fans disposed in the accommodation space <NUM> of the casing <NUM> and configured to generate gas flow in the accommodation space <NUM>. It is worth noting that the number of the flow generator <NUM> is not limited in view of embodiments in the present disclosure.

The heat exchanger <NUM>, for example, is a metal plate made of aluminum. The heat exchanger <NUM> includes an internal heat exchange portion <NUM> and an external heat exchange portion <NUM> which are connected and in thermal contact with each other. The internal heat exchange portion <NUM> has multiple internal heat dissipation channels <NUM>, and the external heat exchange portion <NUM> has multiple external heat dissipation channels <NUM>. The internal heat dissipation channels <NUM> of the internal heat exchange portion <NUM> are non-connected with the external heat dissipation channels <NUM> of the external heat exchange portion <NUM>; in other words, in view of a cross section A0 of the heat exchanger <NUM> (a cross section of the heat exchanger <NUM> along line A-A in <FIG>), the internal heat dissipation channels <NUM> are spaced apart from the external heat dissipation channels <NUM>, such that any gas in the internal heat dissipation channels <NUM> is unable to flow into the external heat dissipation channels <NUM>. The internal heat exchange portion <NUM> further has an inner side surface <NUM> facing toward the display assembly <NUM>, and the external heat exchange portion <NUM> further has an outer side surface <NUM> opposite to the inner side surface <NUM>. Both the internal heat dissipation channel <NUM> and the external heat dissipation channel <NUM> are located between the inner side surface <NUM> and the outer side surface <NUM>. It is worth noting that numbers of the internal heat dissipation channel <NUM> and the external heat dissipation channel <NUM> are not limited in view of embodiments in the present disclosure.

The heat exchanger <NUM> is disposed in the mounting opening <NUM> of the rear portion <NUM> of the casing <NUM>. In detail, the heat exchanger <NUM> further includes an assembling structure <NUM> located between the internal heat exchange portion <NUM> and the external heat exchange portion <NUM>. As shown in <FIG>, the internal heat dissipation channel <NUM> and the external heat dissipation channel <NUM> are arranged at opposite two sides of a reference line, respectively, and the reference line passes across the assembling structure <NUM>. In this embodiment, the assembling structure <NUM> is groove in which a seal ring (not shown in the drawings) may be accommodated, and the heat exchanger <NUM> is mounted in the mounting opening <NUM> by the interference fit between the seal ring and edge of the mounting opening <NUM>. In another embodiment, the heat exchanger is adhered to the mounting opening by adhesive stuffed in the assembling structure. In yet another embodiment, the assembling structure is a hook corresponding to a slot formed on edge of the mounting opening.

The internal heat exchange portion <NUM> is disposed in the accommodation space <NUM>, and the light source <NUM> of the backlight module <NUM> of the display assembly <NUM> is adjacently attached to the inner side surface <NUM> of the internal heat exchange portion <NUM> so as to be in thermal contact with the internal heat exchange portion <NUM>. In other words, the backlight module <NUM> is disposed between the display unit <NUM> and the heat exchanger <NUM>. The internal heat dissipation channels <NUM> are connected with the accommodation space <NUM>, such that the gas flow generated by the flow generators <NUM> in the casing <NUM> is enabled to pass through the internal heat dissipation channels <NUM>. The external heat exchange portion <NUM> protrudes out of the rear portion <NUM> from the mounting opening <NUM>, and the external heat dissipation channels <NUM> are connected with outside. In this embodiment, since the casing <NUM> insulates the internal heat dissipation channels <NUM> from outside and a non-connection is provided between the internal heat dissipation channels <NUM> and the external heat dissipation channels <NUM>, the ambient air flow AF is unable to flow into the internal heat dissipation channels <NUM>, and the gas flow in the casing <NUM> is unable to flow into the external heat dissipation channels <NUM>.

The heat exchanger <NUM> according to this embodiment is favorable for dissipating heat from the display assembly <NUM> so as to reduce the temperature of the display assembly <NUM>. Heat accumulated in the display assembly <NUM> mainly comes from two ways; one way is heat generated by the display assembly <NUM> under sunlight exposure, and the other way is heat generated by the light source <NUM> of the backlight module <NUM>. As shown in <FIG>, the flow generators <NUM> generate gas flow in the accommodation space <NUM> of the casing <NUM> in order to bring heat generated by the display assembly <NUM> away from the backlight module <NUM> via the chamber <NUM>, wherein the chamber <NUM> is located between the display unit <NUM> and the backlight module <NUM>, especially between the liquid cell of the display unit <NUM> and the optical film <NUM> of the backlight module <NUM>. In detail, heat generated by the sunlight incident on the display unit <NUM> transferred to the chamber <NUM>. By a characteristic of heat transfer from high temperature to low temperature during heat exchange or force of the flow generators <NUM>, the high temperature gas flow HF moves from the chamber <NUM> to the internal heat dissipation channels <NUM> of the internal heat exchange portion <NUM> through the accommodation space <NUM>, thereby achieving circulating flow. Due to the connection between the internal heat dissipation channels <NUM> and the inside of the display assembly <NUM>, the high temperature gas flow HF caused by sunlight flows among the chamber <NUM> of the display assembly <NUM> and the internal heat dissipation channels <NUM>.

The ambient air AF (such as cold air) flows in the external heat dissipation channels <NUM> of the external heat exchange portion <NUM>. The high temperature gas flow HF in the internal heat dissipation channels <NUM> raises the temperature of the internal heat exchange portion <NUM>, and the ambient air flow AF in the external heat dissipation channels <NUM> reduces the temperature of the external heat exchange portion <NUM>. Therefore, due to the thermal contact between the internal heat exchange portion <NUM> and the external heat exchange portion <NUM>, heat generated by the display unit <NUM> and the backlight module <NUM> of the display assembly <NUM> is transferred to outside through the heat exchanger <NUM>, thereby reduce the temperature of the display assembly <NUM>.

It is noted that heat generated by the sunlight incident on the display assembly <NUM> or the light source <NUM> of the backlight module <NUM> is accumulated in the display assembly <NUM>. The display assembly <NUM> may include a polarizer (not shown in the drawings), a color filter (not shown in the drawings), an alignment film (not shown in the drawings), the liquid cell layer <NUM>, an optical film (not shown in the drawings) or the like. The heat exchanger <NUM> is mainly configured to dissipate heat accumulated in the component(s) of the display assembly <NUM>.

In this embodiment, the heat exchanger <NUM> equipped with the flow generators <NUM> is used for heat dissipation of the display assembly <NUM> so as to reduce the temperature of the display assembly <NUM>. However, a device which the heat exchanger <NUM> is applied to for heat dissipation is not limited in view of embodiments in the present disclosure.

Results of heat dissipation in the display device of the first embodiment and a conventional display device are illustrated in the following Table I. With a backlight module having same light source power and a casing made of same material, the conventional display device shows higher liquid crystal temperature than the display device disclosed in the first embodiment during operation, which indicates that the heat exchanger of the present disclosure helps to dissipate heat from the components of the display device.

As shown in <FIG> and <FIG>, in this embodiment, the size of internal heat exchange portion <NUM> of the heat exchanger <NUM> matches the size of mounting opening <NUM>, such that any gap between the heat exchanger <NUM> and edge of the mounting opening <NUM> is prevented. The heat exchanger <NUM> is disposed in the mounting opening <NUM>, for example, in embedded manner or adhesive manner. Thus, with working with the non-connected design between the internal heat dissipation channel <NUM> and the external heat dissipation channel <NUM>, it is favorable for preventing moisture and dust existed in the external environment from entering into the casing <NUM>, and thus the display device <NUM> is suitable for outdoor use. In some other embodiments, both the sizes of internal heat exchange portion <NUM> and external heat exchange portion <NUM> can match the size of mounting opening <NUM>.

Furthermore, in this embodiment, a cross sectional area A1 of each internal heat dissipation channel <NUM> of the internal heat exchange portion <NUM> and a cross sectional area A2 of each external heat dissipation channel <NUM> of the external heat exchange portion <NUM> are both rectangular. As shown in <FIG>, in view of a cross section A0 of the heat exchanger <NUM>, cross sections of each internal heat dissipation channel <NUM> and each external heat dissipation channel <NUM> are the aforementioned cross sectional areas. As to the cross sectional area A1 of each internal heat dissipation channel <NUM> and the cross sectional area A2 of each external heat dissipation channel <NUM>, the aspect ratio (ratio of length to width) is from <NUM>:<NUM> to <NUM>:<NUM>. In this embodiment, each of the cross sectional areas A1 and A2 is a rectangular cross section with length L equal to <NUM> millimeters (mm) and width W equal to <NUM>. Thus, it is favorable for preventing negative influence on the compactness of the display device <NUM> due to overly thick heat exchanger <NUM>. It is worth noting that shapes of the cross sectional areas A1 and A2 are not limited in view of embodiments in the present disclosure.

Moreover, in this embodiment, the heat exchanger <NUM> is an integrated single piece. Thus, it is favorable for an easier manufacturing of the heat exchanger <NUM> so as to reduce cost and ensure a proper thermal contact between the internal heat exchange portion <NUM> and the external heat exchange portion <NUM>. It is noted that an integrated heat exchanger <NUM> is not limited in view of embodiments in the present disclosure. In some other embodiments, the internal heat exchange portion and the external heat exchange portion are separated components which are assembled together to obtain the heat exchanger.

As shown in <FIG>, a sum of cross sectional areas A1 of all internal heat dissipation channels <NUM> and cross sectional areas A2 of all external heat dissipation channels <NUM>.

(that is, the total of cross section areas A1 and cross sectional areas A2) is <NUM>% to <NUM>% of the cross section A0 of the heat exchanger <NUM> (that is, a sum of cross sectional area of the internal heat exchange portion <NUM> and cross sectional area of the external heat exchange portion <NUM>). Preferably, a sum of cross sectional areas A1 and cross sectional areas A2 is <NUM>% to <NUM>% of the cross section A0. Thus, sizes of the internal heat dissipation channel <NUM> and the external heat dissipation channel <NUM> is proper for sufficient flow rate, and the heat dissipation area on inner walls inside the internal heat dissipation channel <NUM> and the external heat dissipation channel <NUM> is favorable for providing better thermal contact between the air flow and the heat exchanger <NUM>. In <FIG>, the sum of all cross sectional areas A1 and all cross sectional areas A2 (sum = (A1 X <NUM>)+(A2 X <NUM>)) is <NUM>% of the cross section A0.

<FIG> is a cross sectional view of a display device according to a second embodiment of the present disclosure. Since the second embodiment is similar to the first embodiment, only differences will be described hereafter.

In this embodiment, a display device <NUM> further includes a cover <NUM> disposed on the casing <NUM>, multiple first flow generators 310a (referred to the flow generators <NUM> in the first embodiment) and multiple second flow generators 310b. The first flow generators 310a are disposed in the casing <NUM>. The second flow generators 310b is disposed on the cover <NUM>, and the second flow generators 310b correspond to the external heat dissipation channels <NUM> of the external heat exchange portion <NUM>. The first flow generator 310a is configured to bring the high temperature gas flow HF in the casing <NUM> into the internal heat dissipation channels <NUM> of the internal heat exchange portion <NUM>. The second flow generator 310b is configured to bring ambient air flow AF into the external heat dissipation channels <NUM> of the external heat exchange portion <NUM>.

Since the second flow generator 310b forces air movement to create ambient air flow AF, it is favorable for enhancing heat exchange efficiency between the internal heat exchange portion <NUM> and the external heat exchange portion <NUM>. Also, since the cover <NUM> covers the external heat exchange portion <NUM> protruding from the casing <NUM>, it is favorable for an attractive appearance of the display device <NUM>.

<FIG> is a cross sectional view of a heat exchanger for display device according to a third embodiment of the present disclosure. Since the third embodiment is similar to the first embodiment, only differences will be described hereafter.

In this embodiment, each internal heat dissipation channel 3211a and each external heat dissipation channel 3221a of the heat exchanger 320a has a rectangular cross sectional area with the length L equal to <NUM> and the width W equal to <NUM>. The sum of all cross sectional areas A1 and all cross sectional areas A2 is <NUM>% of the cross section A0 of the heat exchanger 320a.

Results of heat dissipation in a display device including the heat exchanger of the third embodiment and the display device of the first embodiment are illustrated in the following Table II. The display device including the heat exchanger of the third embodiment shows higher liquid crystal temperature and higher light source temperature than the display device disclosed in the first embodiment during operation.

<FIG> is a cross sectional view of a heat exchanger for display device according to a fourth embodiment of the present disclosure. Since the fourth embodiment is similar to the first embodiment, only differences will be described hereafter.

In this embodiment, the heat exchanger 320b further includes multiple heat sink fins F1. The heat sink fins F1 are respectively disposed in some of the internal heat dissipation channels <NUM> of the internal heat exchange portion <NUM> and some of the external heat dissipation channels <NUM> of the external heat exchange portion <NUM>. Thus, it is favorable for increasing the surface area for heat dissipation in the internal heat dissipation channels <NUM> and the external heat dissipation channels <NUM>.

Furthermore, in this embodiment, the sum of all cross sectional areas A1 and all cross sectional areas A2 is <NUM>% of the cross section A0 of the heat exchanger 320b.

Results of heat dissipation in a display device including the heat exchanger of the fourth embodiment and the display device of the first embodiment are illustrated in the following Table III. The display device including the heat exchanger of the fourth embodiment shows higher liquid crystal temperature and higher light source temperature than the display device disclosed in the first embodiment during operation.

<FIG> is an exploded view of the display device according to a fifth embodiment of the present disclosure. <FIG> is a cross sectional view of the display device in <FIG>. Since the fifth embodiment is similar to the first embodiment, only differences will be described hereafter.

In this embodiment, a display device <NUM> is an edge LED. In detail, the display assembly <NUM> of the display device <NUM> includes a light source 222a, and the light source 222a is positioned to be adjacent to the internal heat exchange portion <NUM> of the heat exchanger <NUM>.

According to the disclosure, the heat exchanger includes the internal heat exchange portion and the external heat exchange portion. The flow generator brings the high temperature gas flow in the casing to the internal heat dissipation channel of the internal heat exchange portion. The ambient air flow in the external environment passes through the external heat dissipation channel of the external heat exchange portion. Due to heat exchange between the internal heat dissipation channel and the external heat dissipation channel, heat generated by the backlight module is transferred to outside via the heat exchanger, thereby reducing the temperature of the display device.

Claim 1:
A heat exchanger (<NUM>) for an electronic device (ED) comprising a light module (LM), the heat exchanger (<NUM>) characterized in that the heat exchanger (<NUM>) comprises:
an internal heat exchange portion (<NUM>) configured to be adjacently attached to the light module (LM), the internal heat exchange portion (<NUM>) including at least one internal heat dissipation channel (<NUM>), the at least one internal heat dissipation channel (<NUM>) being connected with a device space (ES) of the electronic device (ED), wherein a high temperature gas flow (HF) generated by the electronic device (ED) is enabled to pass through the device space (ES) and the at least one internal heat dissipation channel (<NUM>);
an external heat exchange portion (<NUM>) in thermal contact with the internal heat exchange portion (<NUM>), the external heat exchange portion (<NUM>) including an external heat dissipation structure (OS) non-connected with the at least one internal heat dissipation channel (<NUM>), wherein the at least one internal heat dissipation channel (<NUM>) is provided between the external heat dissipation structure (OS) and the light module (LM); and
a flow generator (310b) corresponding to the external heat exchange portion (<NUM>),
wherein an ambient air flow (AF) is enabled to pass through the external heat dissipation structure (OS).