JP2013152410A - Liquid crystal display device, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the ratio of wasteful energy out of electric energy supplied to a back light in a liquid crystal display device.SOLUTION: A liquid crystal display device 101 includes a liquid-crystal display panel 1 having a display area 1a, a back light 2 arranged to be overlapped with the liquid-crystal display panel 1 so as to make light incident upon the display area 1a, and a thermoelectric transducer 3 arranged at a position to produce electric power using a temperature difference generated by the heat generation of the back light 2.

Description

  The present invention relates to a liquid crystal display device and a display device.

  A liquid crystal display device usually includes a liquid crystal display panel and a backlight. Since the liquid crystal display panel determines whether or not to transmit light according to the orientation of liquid crystal molecules for each pixel, in order to make the image or video visible to the user, light is irradiated from behind. is necessary. The backlight supplies light for that purpose.

  When the light from the backlight passes through the liquid crystal display panel and enters the eyes of the user, the image or video is recognized by the user. An example of such a liquid crystal display device is disclosed in Japanese Patent Application Laid-Open No. 2005-234562 (Patent Document 1).

  As the light source of the backlight, a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), or the like is used. Even when these are used as the light source, a certain amount of heat is generated.

JP 2005-234562 A

  In the liquid crystal display device based on the prior art, the energy of light that actually contributes to the display is very small among the electric energy supplied to the backlight. Here, “light contributing to display” is light emitted from the liquid crystal display device toward the user.

  Of the electrical energy supplied to the backlight, the energy of light contributing to display is only about 1% in terms of ratio. In other words, most of the wasteful energy does not contribute to display.

  In Patent Document 1, an attempt is made to convert energy converted from electricity to light in a backlight again into electricity using what is wasted as it is. However, in the backlight, applied electric energy is converted not only to light but also to heat. The energy converted to heat in the backlight was then released to the surroundings without any use. Even when the technique described in Patent Document 1 is applied, the heat generated in the backlight is not utilized at all.

  A perspective view of a liquid crystal display device based on the prior art is shown in FIG. The liquid crystal display device 100 includes a liquid crystal display panel 1 and a backlight 2. A power supply 4 is connected to the backlight 2. Most of the power supplied from the power source 4 to the backlight 2 was wasted as heat 81 to the surroundings. In the liquid crystal display device 100 based on the prior art, it is necessary to supply a considerable amount of electric power compared to the energy that is originally required for display in anticipation of such poor energy yield.

  In addition to liquid crystal display devices, display devices including self-luminous display panels are considered to have wasted heat released to the surroundings.

  Therefore, an object of the present invention is to provide a liquid crystal display device and a display device that can reduce the ratio of wasted energy in the supplied electric energy.

  In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal display panel having a display area, and a backlight disposed on the liquid crystal display panel so as to make light incident on the display area. A thermoelectric conversion element disposed at a position where power can be generated using a temperature difference caused by heat generation of the backlight.

  According to the present invention, since the thermoelectric conversion element is arranged at a position where power generation is possible using the temperature difference caused by the heat generation of the backlight, when the heat is generated from the backlight, the thermoelectric conversion element 3 is caused by the temperature difference. Electric power is generated. By extracting and using this electromotive force, it is possible to reduce the proportion of wasted energy among the electric energy supplied to the backlight.

It is a conceptual diagram of a general thermoelectric conversion element. It is a perspective view of the liquid crystal display device in Embodiment 1 based on this invention. It is sectional drawing of the liquid crystal display device in Embodiment 1 based on this invention. It is sectional drawing of the modification of the liquid crystal display device in Embodiment 1 based on this invention. It is sectional drawing of the liquid crystal display device in Embodiment 2 based on this invention. It is a top view of the liquid crystal display device in Embodiment 2 based on this invention. In Embodiment 2 based on this invention, it is explanatory drawing which shows the thickness of a 1st liquid crystal display device. In Embodiment 2 based on this invention, it is explanatory drawing which shows the thickness of a 2nd liquid crystal display device. It is sectional drawing of the modification of the liquid crystal display device in Embodiment 2 based on this invention. It is a perspective view of the backlight with which the liquid crystal display device in Embodiment 3 based on this invention is provided. It is sectional drawing of the liquid crystal display device in Embodiment 3 based on this invention. It is a top view of the TFT substrate with which the liquid crystal display device in Embodiment 3 based on this invention is equipped, and the thermoelectric conversion element formed in the surface. It is a top view of the 1st example of concrete structures, such as a TFT substrate shown in Drawing 12, and a thermoelectric conversion element formed in the surface. It is a top view of the 2nd example of concrete structures, such as a TFT substrate shown in Drawing 12, and a thermoelectric conversion element formed in the surface. It is a perspective view of the backlight with which the liquid crystal display device in Embodiment 4 based on this invention is provided. It is sectional drawing of the liquid crystal display device in Embodiment 4 based on this invention. It is a perspective view of the display apparatus in Embodiment 5 based on this invention. It is sectional drawing of the liquid crystal display device in Embodiment 5 based on this invention. It is sectional drawing of the modification of the liquid crystal display device in Embodiment 5 based on this invention. It is sectional drawing of the liquid crystal display device in Embodiment 6 based on this invention. It is a perspective view of the liquid crystal display device based on a prior art.

  First, the principle of thermoelectric conversion will be described. When two types of metals or semiconductors are joined to form a loop and the joints are kept at different temperatures, an electromotive force is generated. A “thermoelectric conversion element” is an element that can generate an electromotive force from a temperature difference using this phenomenon, as shown in FIG.

(Embodiment 1)
(Constitution)
With reference to FIG. 2, the liquid crystal display device in Embodiment 1 based on this invention is demonstrated. A liquid crystal display device 101 according to the present embodiment includes a liquid crystal display panel 1 having a display area 1a, a backlight 2 disposed on the liquid crystal display panel 1 so as to make light incident on the display area 1a, and a backlight. And a thermoelectric conversion element 3 disposed at a position where power can be generated using a temperature difference caused by the heat generation of the two. In the example shown in FIG. 2, the liquid crystal display panel 1 and the thermoelectric conversion element 3 are connected to a power source 4.

(Action / Effect)
When the backlight 2 emits light with the operation of the liquid crystal display device 101, the backlight 2 generates heat. In the present embodiment, since the thermoelectric conversion element 3 is arranged at a position where power generation is possible using the temperature difference generated by the heat generation of the backlight 2, the heat generation of the backlight 2 occurs when heat is generated from the backlight 2. As a result, an electromotive force is generated in the thermoelectric conversion element 3 due to a temperature difference between the part that is at a high temperature and the part that is not. Since this electromotive force can be taken out and used effectively, the ratio of wasted energy among the electric energy supplied to the backlight 2 can be reduced.

  While the backlight 2 emits light, the backlight 2 is on the high temperature side, and the side opposite to the backlight 2 of the thermoelectric conversion element 3 is on the low temperature side, whereby not only power generation in the thermoelectric conversion element 3 is performed. Even after the backlight 2 is turned off, the thermoelectric conversion element 3 can generate power if there is a temperature difference due to the residual heat of the module. After the module has no residual heat, the thermoelectric conversion element 3 can take in the exhaust heat drifting in the surrounding environment and generate electric power.

  In the present embodiment, for example, as shown in FIG. 3, the thermoelectric conversion element 3 and the liquid crystal display panel 1 are electrically connected so that the electricity generated by the thermoelectric conversion element 3 can be used for driving the liquid crystal display panel 1. Are preferably connected. In the example shown in FIG. 3, the liquid crystal display panel 1 and the thermoelectric conversion element 3 are electrically connected by a conducting wire 5.

  Alternatively, as shown in FIG. 4, an external power source 13 that supplies power for driving the liquid crystal display panel 1 is provided, and the external power source 13 can be charged using electricity generated in the thermoelectric conversion element 3. The thermoelectric conversion element 3 and the external power supply 13 may be electrically connected. By adopting this configuration, power can be generated by the residual heat of the backlight of the liquid crystal display panel even during a time period when the liquid crystal display panel is not driven, and the generated electricity is effectively used for charging the external power source. be able to.

  As shown in FIGS. 3 and 4, the thermoelectric conversion element 3 is preferably disposed on the surface of the backlight 2 opposite to the liquid crystal display panel 1.

  Although the liquid crystal display device 101 has been described as a combination of the transmissive liquid crystal display panel 1 and the backlight 2, the present invention can be similarly applied to a self-luminous display device. This is because even if the display device is a self-luminous display device and does not include a backlight, the display device itself generates heat due to light emission.

(Embodiment 2)
(Constitution)
With reference to FIG. 5 and FIG. 6, the liquid crystal display device in Embodiment 2 based on this invention is demonstrated. As shown in FIG. 5, the liquid crystal display device 102 in the present embodiment includes a liquid crystal display panel 1, a backlight 2, and a thermoelectric conversion element 3. FIG. 6 shows the liquid crystal display device 102 as viewed from the upper side in FIG. The liquid crystal display panel 1 includes a TFT (Thin Film Transistor) substrate 11 as a first substrate and a CF (Color Filter) substrate 12 as a second substrate, which are bonded together so as to sandwich a liquid crystal layer (not shown). Including. The first substrate has a protruding portion that extends from the second substrate. In the example shown in FIG. 5, the TFT substrate 11 has a protruding portion 10 that extends from the CF substrate 12 and extends. The thermoelectric conversion element 3 is disposed on the overhanging portion 10. For example, a driver 6 is disposed on the overhanging portion 10. An FPC (Flexible printed circuits) 7 is attached further outward from the overhanging portion 10. The backlight 2 is disposed so as to overlap the surface of the TFT substrate 11 opposite to the CF substrate 12.

(Action / Effect)
In the present embodiment, since the thermoelectric conversion element 3 is disposed in the overhanging portion 10, a temperature difference caused by heat generation of the backlight 2 that propagates through the substrate on which the overhanging portion 10 exists, that is, the TFT substrate 11. Can generate electricity.

  Compared with the liquid crystal display device 101 shown in the first embodiment, in the liquid crystal display device 102 in the present embodiment, the thermoelectric conversion element 3 is disposed in the overhanging portion 10, so that the thermoelectric conversion element 3 is mounted. The total thickness due to can be made zero or very small. For example, the overall thickness B of the liquid crystal display device 102 shown in FIG. 8 is smaller than the overall thickness A of the liquid crystal display device 101 shown in FIG.

  As shown in FIG. 9, the backlight 2 included in the liquid crystal display device 102 may have a structure including an LED light source 18 at one end. In this example, the backlight 2 includes an LED light source 18 and a light guide plate 19 disposed adjacent to the LED light source 18. The backlight having such a structure is generally called an edge light type. In liquid crystal display devices for mobile devices, an edge light type backlight is often employed. As described in the present embodiment, the mounting area of the thermoelectric conversion element 3 tends to be small in the structure in which the thermoelectric conversion element 3 is arranged in the overhanging portion 10, but the edge light type as shown in FIG. In this case, the LED light source 18 that particularly generates heat in the backlight 2 is disposed at one end, so that the position of the thermoelectric conversion element 3 and the position of the LED light source 18 can be substantially overlapped. A temperature difference caused by heat generated from the light source 18 can be efficiently used for power generation.

  Note that the backlight included in the liquid crystal display device in this embodiment may be an edge light type in which light sources are arranged on both sides. A corner light type may be used instead of the edge light type.

(Embodiment 3)
(Constitution)
A liquid crystal display device according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 shows a state where the backlight included in the liquid crystal display device in this embodiment is taken out independently. The backlight 2 has a first side 2a and a second side 2b facing each other. The backlight 2 includes an LED light source 18 and a light guide plate 19. The LED light source 18 is disposed along the first side 2a.

  A liquid crystal display device in this embodiment is shown in FIG. The liquid crystal display device 103 includes a TFT substrate 11, a CF substrate 12, and a backlight 2. FIG. 12 shows a planar view of the TFT substrate 11 included in the liquid crystal display device 103, the thermoelectric conversion element 3 formed on the surface thereof, and the conductive wire 5 connected thereto. The thermoelectric conversion element 3 includes a base portion 3a arranged linearly along one side of the TFT substrate 11, and branch portions 3b1, extending from both ends of the base portion 3a along the outline of the TFT substrate 11, respectively. 3b2. The two branch portions 3b1 and 3b2 extend along two opposite sides, respectively, and the ends of the two branch portions 3b1 and 3b2 reach the sides opposite to the sides where the base portions are arranged. Has reached. In the example shown in FIG. 12, the tips of the two branch portions 3b1 and 3b2 reach the opposite sides and then bend along the sides of the TFT substrate 11 and further extend by a certain distance as the tip portions 3c1 and 3c2. Exist. The tip portions 3c1 and 3c2 are spaced apart from each other. The side where the base portion 3a is disposed corresponds to the first side 2a of the backlight 2, and the side where the tips of the two branch portions 3b1 and 3b2 reach corresponds to the second side 2b of the backlight 2. .

  In the example shown in FIG. 12, the thermoelectric conversion element 3 has the base portion 3 a disposed along the first side 2 a, while the tip portions 3 c 1 and 3 c 2 are disposed along the second side 2 b. Therefore, it can be said that the backlight 2 is disposed so as to straddle the first side 2a and the second side 2b.

  In the liquid crystal display device 103, the backlight 2 has a first side 2a and a second side 2b opposite to the first side 2a. The backlight 2 includes an LED light source 18 as a light source disposed along the first side 2a, and a light guide plate 19 disposed adjacent to the light source and extending toward the second side 2b. Including. The thermoelectric conversion element 3 is disposed so as to straddle the first side 2a and the second side 2b. In FIG. 11, the thermoelectric conversion element 3 is illustrated as being disposed on the surface of the TFT substrate 11 on the CF substrate 12 side, but the thermoelectric conversion element 3 is disposed on the surface of the TFT substrate 11 opposite to the CF substrate 12. It is good also as what is done.

(Action / Effect)
In the present embodiment, the thermoelectric conversion element 3 is disposed so as to straddle the first side 2a and the second side 2b, but the temperature is between the first side 2a and the second side 2b. Since the difference is particularly large, when the thermoelectric conversion element 3 generates electric power, the temperature difference caused by the heat generated by the light source of the backlight 2 can be used efficiently.

  In the example shown in FIG. 12, the thermoelectric conversion element 3 extends only in the vicinity of the outer edge avoiding the center of the TFT substrate 11, but the thermoelectric conversion element 3 is arranged at the outer edge avoiding the display area. It is preferable. This is because it is possible to avoid obstructing the display of the liquid crystal display panel 1 in this way.

  In addition, the 1st example of the specific structure of the thermoelectric conversion element 3 shown in FIG. 12 is shown in FIG. Thermoelectric conversion element 3 includes an N-type semiconductor portion 3n, a P-type semiconductor portion 3p, and conductor portions 3c1, 3c2, and 3d. Assuming that one side of the TFT substrate 11 is the side 11a and the other side is the side 11b, the N-type semiconductor portion 3n extends from the portion along the side 11a so as to reach the side 11b along the outer edge of the TFT substrate 11. ing. The P-type semiconductor portion 3p also extends from the portion along the side 11a so as to reach the side 11b along the outer edge of the TFT substrate 11. The N-type semiconductor portion 3n and the P-type semiconductor portion 3p extend to different sections on the outer edge of the TFT substrate 11, respectively. The N-type semiconductor portion 3n and the P-type semiconductor portion 3p are electrically connected via a conductor portion 3d.

  FIG. 14 shows a second example of the specific structure of the thermoelectric conversion element 3 shown in FIG. This thermoelectric conversion element 3 includes N-type semiconductor portions 3n1, 3n2, 3n3, 3n4, P-type semiconductor portions 3p1, 3p2, 3p3, 3p4 and a conductor portion 3d. These N-type semiconductor parts and P-type semiconductor parts are arranged in parallel along the outer periphery of the TFT substrate 11. Each of the N-type semiconductor portion and the P-type semiconductor portion is arranged to connect the side 11a and the side 11b. The N-type semiconductor portion and the P-type semiconductor portion are alternately connected in series via the conductor portion 3d.

  When the first substrate is the TFT substrate 11, the first substrate naturally includes a TFT element on the surface facing the liquid crystal layer. When the TFT substrate 11 is manufactured, a process of forming a semiconductor film that constitutes a part of the TFT element is required. By using this process of forming the semiconductor film, an N-type for the thermoelectric conversion element 3 is simultaneously used. It is conceivable to form a P-type semiconductor portion.

(Embodiment 4)
(Constitution)
With reference to FIG. 15 and FIG. 16, the liquid crystal display device in Embodiment 4 based on this invention is demonstrated. FIG. 15 shows a state where the backlight included in the liquid crystal display device in this embodiment is taken out independently. The backlight 2w has a first side 2a and a second side 2b facing each other. The backlight 2 includes LED light sources 18 a and 18 b and a light guide plate 19. The LED light source 18a is disposed along the first side 2a. The LED light source 18b is disposed along the first side 2b.

  FIG. 16 shows a liquid crystal display device in this embodiment. The liquid crystal display device 104 includes a TFT substrate 11, a CF substrate 12, and a backlight 2w. The TFT substrate 11 included in the liquid crystal display device 104, the thermoelectric conversion element 3 formed on the surface of the TFT substrate 11, and the conductive wire 5 connected to the TFT substrate 11 are taken out and viewed in a plane, which is the same as that shown in FIG.

  In the liquid crystal display device 104, the backlight 2w has a first side 2a and a second side 2b opposite to the first side 2a. The backlight 2w includes an LED light source 18a as a first light source disposed along the first side 2a, an LED light source 18b as a second light source disposed along the second side 2b, The light guide plate 19 is disposed between the first side 2a and the second side 2b while being adjacent to the first light source and the second light source. The thermoelectric conversion element 3 is disposed so as to straddle the first side 2a and the second side 2b.

(Action / Effect)
The liquid crystal display device in the present embodiment is different from the liquid crystal display device in the third embodiment in that the light source of the backlight is arranged not only on one side but on two sides facing each other. Even in such a configuration, as described above, by arranging the thermoelectric conversion element 3 so as to straddle the first side 2a and the second side 2b, the same effect as in the third embodiment can be obtained. be able to. That is, the temperature difference is particularly large between the first side 2a and the second side 2b. Therefore, when the thermoelectric conversion element 3 generates power, the temperature difference caused by the heat generated by the light source of the backlight 2w is reduced. It can be used efficiently.

  Each of the liquid crystal display devices 102, 103, and 104 includes a thin film transistor (hereinafter referred to as “TFT”) element including a semiconductor layer, and the thermoelectric conversion element includes a semiconductor portion that is simultaneously formed when the semiconductor layer is formed. preferable. By adopting this configuration, it is not necessary to perform an extra film forming step for forming the semiconductor portion, and the number of manufacturing steps can be reduced.

(Embodiment 5)
(Constitution)
With reference to FIGS. 17 and 18, a display device according to Embodiment 5 of the present invention will be described. The display device 201 according to the present embodiment includes a self-luminous display panel 14 having a display region 14a, and a thermoelectric conversion element 3 disposed at a position where power can be generated using a temperature difference caused by heat generated by the self-luminous display panel 14. Is provided. In the example shown in FIG. 17, the self-luminous display panel 14 and the thermoelectric conversion element 3 are connected to the power source 4. A cross-sectional view of the display device 201 is shown in FIG.

(Action / Effect)
With the operation of the display device 201, when the self light emitting display panel 14 emits light, the self light emitting display panel 14 generates heat. In the present embodiment, since the thermoelectric conversion element 3 is arranged at a position where power can be generated using the temperature difference generated by the heat generation of the self light emitting display panel 14, when the backlight 2 generates heat, the self light emitting display is performed. An electromotive force is generated in the thermoelectric conversion element 3 due to a temperature difference between a portion that becomes high temperature due to heat generation of the panel 14 and a portion that does not. Since this electromotive force can be extracted and used effectively, the ratio of wasted energy among the electric energy supplied to the self-luminous display panel 14 can be reduced.

  In the present embodiment, for example, as shown in FIG. 18, the thermoelectric conversion element 3, the self-luminous display panel 14, and the like can be used for driving the self-luminous display panel 14 so that the electricity generated by the thermoelectric conversion element 3 can be used. Are preferably electrically connected.

  Alternatively, as in the display device 201e shown in FIG. 19, an external power source 13 that supplies power for driving the self-luminous display panel 14 is provided, and the external power source 13 is charged using electricity generated in the thermoelectric conversion element 3. The structure in which the thermoelectric conversion element 3 and the external power supply 13 are electrically connected may be possible. By adopting this configuration, even when the self-luminous display panel is not driven, power can be generated by the residual heat of the self-luminous display panel, and the generated electricity can be effectively used for charging the external power supply. Can do.

  As shown in FIGS. 18 and 19, the thermoelectric conversion element 3 is preferably disposed on the surface of the self-luminous display panel 14 opposite to the display region 14 a.

(Embodiment 6)
(Constitution)
With reference to FIG. 20, the display apparatus in Embodiment 6 based on this invention is demonstrated. The display device 202 in the present embodiment has a rough configuration in common with the display devices 201 and 201e described in the fifth embodiment, but differs in the following points. In the display device 202, the self light emitting display panel 14 includes a light emitting layer 20, and a first substrate 21 and a second substrate 22 arranged so as to sandwich the light emitting layer 20, and the first substrate 21 is a second substrate. The thermoelectric conversion element 3 is disposed on the overhanging portion 10i.

(Action / Effect)
In the present embodiment, since the thermoelectric conversion element 3 is arranged in the overhanging portion 10i, it is possible to generate electric power from a temperature difference caused by heat propagated through the substrate on the side where the overhanging portion 10i exists.

  The display devices in Embodiments 5 and 6 preferably include a thin film transistor element including a semiconductor layer, and the thermoelectric conversion element preferably includes a semiconductor portion formed simultaneously with the formation of the semiconductor layer. By adopting this configuration, when forming the semiconductor layer included in the thin film transistor element, the semiconductor part for the thermoelectric conversion element can be formed at the same time, so an extra film forming step for forming the semiconductor part This is because there is no need to perform such as.

In addition, you may employ | adopt combining suitably some among the said embodiment.
In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel, 1a, 14a Display area, 2, 2w Backlight, 2a 1st edge | side, 2b 2nd edge | side, 3 Thermoelectric conversion element, 3a Base part, 3c1, 3c2 tip part, 3d Electrical conductor part, 3n , 3n1, 3n2, 3n3, 3n4 N-type semiconductor part, 3p, 3p1, 3p2, 3p3, 3p4 P-type semiconductor part, 4 power supply, 5 conductor, 6 driver, 7 FPC, 10, 10i overhang part, 11 TFT substrate, 11a, 11b side, 12 CF substrate, 13 external power source, 14 self-luminous display panel, 18, 18a, 18b LED light source, 19 light guide plate, 20 light emitting layer, 21 first substrate, 22 second substrate, 81 heat, 100 ( Conventional) liquid crystal display device, 101, 101e, 102, 103, 104 liquid crystal display device, 201, 201e, 202 display device.

Claims (14)

A liquid crystal display panel having a display area;
A backlight arranged over the liquid crystal display panel so that light is incident on the display area;
A liquid crystal display device comprising: a thermoelectric conversion element disposed at a position where power can be generated using a temperature difference caused by heat generation of the backlight.   The liquid crystal display device according to claim 1, wherein the thermoelectric conversion element and the liquid crystal display panel are electrically connected so that electricity generated by the thermoelectric conversion element can be used for driving the liquid crystal display panel. .   The thermoelectric conversion element and the external power supply include an external power supply that supplies power for driving the liquid crystal display panel, and the external power supply can be charged using electricity generated by the thermoelectric conversion element. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is electrically connected.   The liquid crystal display device according to claim 1, wherein the thermoelectric conversion element is disposed on a surface of the backlight opposite to the liquid crystal display panel. The liquid crystal display panel includes a first substrate and a second substrate bonded to each other so as to sandwich a liquid crystal layer,
The first substrate has a protruding portion that extends and extends from the second substrate,
The liquid crystal display device according to claim 1, wherein the thermoelectric conversion element is disposed in the projecting portion.   4. The liquid crystal display device according to claim 1, further comprising a thin film transistor element including a semiconductor layer, wherein the thermoelectric conversion element includes a semiconductor portion formed simultaneously with the formation of the semiconductor layer. The backlight has a first side and a second side opposite to the first side, and the backlight is adjacent to the light source and a light source disposed along the first side. And including a light guide plate arranged extending toward the second side,
The liquid crystal display device according to claim 1, wherein the thermoelectric conversion element is arranged so as to straddle the first side and the second side. The backlight has a first side and a second side opposite to the first side, and the backlight includes a first light source disposed along the first side, A second light source disposed along a second side, and a light guide plate disposed between the first side and the second side while being adjacent to the first light source and the second light source Including
The liquid crystal display device according to claim 1, wherein the thermoelectric conversion element is arranged so as to straddle the first side and the second side. A self-luminous display panel having a display area;
A display device comprising: a thermoelectric conversion element disposed at a position where power can be generated using a temperature difference generated by heat generation of the self-luminous display panel.   The display according to claim 9, wherein the thermoelectric conversion element and the self-luminous display panel are electrically connected so that electricity generated by the thermoelectric conversion element can be used for driving the self-luminous display panel. apparatus.   An external power supply for supplying power for driving the self-luminous display panel; and the thermoelectric conversion element and the external power supply so that the external power supply can be charged using electricity generated by the thermoelectric conversion element. The display device according to claim 9 or 10, wherein are electrically connected.   The display device according to claim 9, wherein the thermoelectric conversion element is disposed on a surface opposite to the display area of the self-luminous display panel. The self-luminous display panel includes a light emitting layer, and a first substrate and a second substrate disposed so as to sandwich the light emitting layer,
The first substrate has a protruding portion that extends and extends from the second substrate,
The display device according to claim 9, wherein the thermoelectric conversion element is disposed in the projecting portion.   The display device according to claim 9, further comprising a thin film transistor element including a semiconductor layer, wherein the thermoelectric conversion element includes a semiconductor portion formed simultaneously with the formation of the semiconductor layer.

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