Contrast adjustment system for a display device

Abstract

To provide a contrast adjustment system for a display device of a watch that can be used in an environment exposed to a specific temperature and can accurately and efficiently reading information present on the display device.SOLUTION: In a contrast adjustment system 100 for a display device of a watch 10, a case 12 of the watch 10 can be removably arranged in a compartment 4 of a thermally protective housing 1 for mechanical and / or functional components 5 of the watch 10, the display device is arranged so as to face a crystal 6 of the housing 1, the housing 1 comprises a reversible fastening device 13 for fastening the case 12 of the watch 10 to the compartment 4 while keeping it away from a functional element 15 of the housing 1, and the functional element 15 forming the compartment 4 comprises a middle part 9a of the housing 1, a back part 9b and the crystal 6. The system comprises an electronic device 110 configured to adjust the contrast of the display device when the electronic device 110 and the housing 1 are connected to each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a system for adjusting the contrast of a display device of a clock housed in a thermal protection housing.

Background Art

[0002] A clock generally includes a bracelet and a clock case having some mechanical, electrical or electronic components. In the prior art, some of these components are known to be unable to withstand certain temperatures and will not function properly at these temperatures. One existing solution is to place the case of this clock in a Dewar housing to protect such components, as described in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, it is necessary to be able to use the clock in an environment where it is likely to be exposed to such temperatures, and in particular, to be able to accurately and efficiently read the information present on the display device of such a clock.

Means for Solving the Problems

[0005] For this purpose, the present invention relates to a contrast adjustment system for a display device of a clock, which is a system in which the case of the clock can be detachably arranged in a housing that thermally protects the mechanical and / or functional components of the clock. The system includes · the housing, · An enclosure that thermally protects the mechanical and / or functional parts of the watch, the enclosure being formed by functional elements of the housing, these elements comprising an intermediate part, a back, and a crystal including a device for dynamically varying the luminance of the visible face of the display device, the enclosure; · A reversible fastening device for fastening the case of the watch to the enclosure and for detaching the case of the watch from the functional elements; · A control unit connected to the device for dynamically varying the luminance of the crystal, the control unit comprising an event sensor capable of causing a change in ambient luminance in the environment of the housing; The housing comprising; · A watch comprising a display device and a case that can be removably arranged in the enclosure with the display device facing the crystal of the housing; · An electronic device configured to assist in controlling the device for dynamically varying the luminance in order to adjust the contrast of the display device, together with a control unit provided with a sensor thereof; Comprising. In other embodiments, · The display device comprises a visible face that can be useful for displaying time information or information regarding functions realized by the watch, the visible face being arranged facing the crystal of the housing. · The device for dynamically varying the luminance of the crystal can transmit any light radiation entering the enclosure of the housing. · The electronic device is configured to adjust the contrast of the display device by generating and transmitting at least one command for controlling the device for dynamically varying the luminance of this crystal. · The control unit of the housing is configured to vary the contrast of the display device in response to at least one received command for controlling the device for dynamically varying the luminance. · The control unit of the thermally protective housing is connected to the device for dynamically varying the luminance of the crystal by a connecting element. · The device for dynamically varying the luminance of the crystal is an illumination element, particularly a transparent OLED-type illumination element. · The electronic device includes a communication unit and a controller configured to control this communication unit. · The electronic device is configured to be connected to the housing using a wireless connection technology. · The interior is under vacuum or quasi-vacuum. · The crystal has a surface area that is substantially larger or strictly larger than the surface area of the crystal of the watch case.

Brief Description of the Drawings

[0006] Other specific features and advantages will be clearly observed in the following description, which is provided as a general guide with reference to the accompanying drawings and is in no way provided as a limiting guide.

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0007] FIG. 1 shows a system 100 for adjusting the contrast of the display device of a watch 10. The case 12 of the watch 10 is disposed in the interior 4 of a housing 1 for the thermal protection 120 of the mechanical and / or functional parts 5 of this watch 10. Such a system 100 can thus particularly dynamically adjust / set the contrast of this display device, which can be the dial of the watch 10, according to the vision of the user of this protection housing 1. By such an adjustment of the contrast, the readability of the information displayed by this display device can be improved in consideration of the ambient luminance of the housing 1. In particular, it should be noted that this system 100 can form an optimal contrast between one or more graphic representations related to one or more information items and their background.

[0008] For this purpose, the system 100 accordingly comprises a clock 10, a thermal protection housing 1 for the mechanical and / or functional parts 5 of the clock 10, and an electronic device 110. In the system 100, the protection housing 1 is provided with a transparent crystal 6, and the electronic device 110 can be connected to the housing 1, in particular to the control unit 8 of this housing 1, in order to control / manage / regulate the contrast of the display device. It should be particularly noted that this electronic device 110 is configured to be connected to the housing 1 using a wireless connection technology of the NFC (acronym for Near Field Communication), WiFi or Bluetooth type.

[0009] By cooperating with the control unit 8, such an electronic device 110 makes it possible to adjust the contrast of this display device by sending appropriate instructions to the control unit 8 of the housing 1 in order to change the contrast of this display device, as will be seen later.

[0010] In the system 100, such a thermal protection housing 1 can also be called an "isothermal case" or a "Dewar housing". Such a housing 1 can include a bracelet and thus form a thermal protection device 120, which is also called an "isothermal device" or a "Dewar clock device" or even more simply a "Dewar device".

[0011] Referring to FIG. 2, the thermal protection housing 1 of the present system 100 can provide good heat insulation for the mechanical and / or functional parts 5 of the clock 10, and the case 12 of the clock 10 must be arranged in the cavity 4 of this housing 1 to provide such heat insulation for these parts 5. In other words, this housing 1 is formed by the combination of its functional elements 15 and the case 12 of the clock 10, especially to provide suitable heat insulation for these mechanical and / or functional parts 5. These functional elements 15 of the housing 1 forming the cavity 4 include the crystal 6 of this housing 1, the inner peripheral wall 17 of the middle part 9a, and the back part 9b. In this configuration, the case 12 of the clock 10 is arranged in such a cavity 4 in a state separated from or at a distance from the functional elements of the housing 1 forming the cavity 4. Note that this inner peripheral wall 17 of the middle part 9a is also the inner peripheral wall of the cavity 4.

[0012] In the present system 100, the housing 1 includes a crystal 6 which is a transparent crystal 6 having variable brightness / illuminance directed towards the display device of the clock 10, and a control unit 8 connected to this crystal 6 and configured to control / manage / set / adjust this brightness / illuminance. When the clock case 12 is arranged in the cavity 4 of this housing 1, the visible surface of the display device faces this crystal 6, especially faces the inner surface 16 of this crystal 6. This visible surface can be used to display the time display or information related to the functions realized by the clock 10.

[0013] In this regard, the control unit 8 includes an electronic circuit provided with hardware resources, especially a controller including an energy storage device also called a battery, as well as a memory element and at least one processor cooperating with data and control address buses. This control unit 8 includes, in its memory element, an algorithm for managing the adjustment of the contrast of the display device of the clock 10 based on instructions received from the electronic device 110. Such an algorithm is executed by the processor of this control unit 8 in consideration of these instructions.

[0014] The housing 1 can be provided with an event sensor 25 included in the control unit 8. Such a sensor 25 is likely to serve / cause / generate a change in the ambient luminance in the environment of the housing 1 and can generate data related to the events detected by these sensors, which may interfere with / alter the reading of the information present on / in the display device. These events are likely to cause a change in the ambient luminance in the environment of the housing 1. These events include, but are not limited to, the detection of a specific level of luminance in the environment of the housing 1, particularly light radiation such as solar radiation.

[0015] In this regard, the event sensor comprises a luminance sensor that includes, in particular but without limitation and comprehensiveness, a solar sensor and / or an infrared solar sensor and / or an ultraviolet solar sensor.

[0016] Note that the event sensor forms part of the control unit 8 and is connected to the controller of this unit. The luminance sensor is arranged within the housing 1, particularly on at least one of the functional elements 15 of this housing 1, so as to be exposed to the light coming from the external environment of the housing 1. By way of example, this luminance sensor can be arranged within the body of the crystal 6 of this housing 1 and / or on the inner surface 16 of this crystal 6.

[0017] In this housing 1, the control unit 8 comprises a substrate such as a flexible PCB on which its electronic circuit is arranged, excluding the luminance sensor that may be included within or on the inner surface 16 of the crystal 6 of this housing 1. In this regard, this circuit can be assembled on this substrate using a three-dimensional printing process or a polymer printing process. Note that this substrate is arranged on one of the functional elements 15 such as the back 9b in the compartment 4 or the inner peripheral wall 17 of the compartment 4.

[0018] As described above, the control unit 8, particularly its controller, is connected / linked to the crystal 6 of the housing 1 by the connecting element 14. Such a crystal 6 is composed of a substrate and a transparent device 7 arranged within or on this substrate for dynamically changing the luminance / illumination / illuminance. This substrate is made of a material such as glass, for example, mineral glass, acrylic glass, optical ceramic, sapphire glass, etc. In this crystal 6, such a dynamic luminance changing device 7 is, for example, a transparent lighting element, particularly an organic light-emitting diode lighting element known by the acronym OLED.

[0019] Such an OLED-type lighting element comprises a stack of transparent functional layers with layers of organic light-emitting materials, and the stack is electrically supplied by transparent electrodes generally in the form of the first and second conductive layers of this / these material layers located on the sides of the layer(s) of this / these materials. Such an OLED-type lighting element 7 can be designed to emit a multicolor emission defined at 0° by the coordinates (x1, y1) in the CIE 1931 XYZ color space, and thus the coordinates are given with respect to the emission towards the normal. This transparent lighting element 7 is configured to emit light radiation in the direction of or towards the display device.

[0020] Non-limiting and non-exhaustive, the light-emitting layer can include small molecules called SM-OLED (small molecule organic light-emitting diode) or polymers called PLED (polymer light-emitting diode).

[0021] In a first alternative embodiment of the crystal 6 of the housing 1, the dynamic luminance changing device 7 is arranged / applied / printed / vapor-deposited on the lower surface of the substrate, thereby forming the inner surface 16 of this crystal 6.

[0022] In a second alternative embodiment of the crystal 6 of the housing 1, the dynamic luminance changing device 7 is included in the body of the substrate forming this crystal 6 of the housing 1. In this regard, this substrate can be formed from two layers of a transparent material such as glass, and the dynamic luminance changing device 7 is arranged between these layers.

[0023] Even if the dynamic luminance changing device 7 is present within or on the substrate included in the crystal 6, the transmittance characteristics of this crystal 6 of the housing 1 do not change.

[0024] Thereby, the control unit 8 controls the voltage applied to the first and second conductive layers of the dynamic luminance changing device 7 by executing the control / regulation commands received from the electronic device 110, and changes the illuminance / light intensity applied to the display device, particularly the distribution of the illuminance / light intensity across the entire display device. Thereby, the control unit 8 can form the contrast of the display device adapted to the ambient luminance for the purpose of facilitating the reading of this display device and / or enhancing the reading comfort of the user of this housing 1.

[0025] This change in illumination / illuminance generated by the dynamic luminance changing device 7, also called a change in light intensity, occurs between two states. The first state relates to the maximum light intensity, and the second state relates to zero light intensity.

[0026] In this system 100, the electronic device 110, also called a user terminal, is a device 110 that can be worn and carried by the user of the thermal protection device 120. This applies, for example, to smartphones, phablets or tablets. This electronic device 110 includes a housing 20 in which an electronic circuit 21 is arranged. This electronic circuit 21 includes a controller 22 and a communication unit 23, particularly a communication unit operating using a short-range wireless communication (NFC) unit 23 or a wireless technology such as Bluetooth or WiFi, both of which are powered by a battery. This controller 22 can execute instructions for executing a computer program configured to process requests / instructions / data between, for example, the housing 1, particularly its control unit 8. The electronic device 110 can further include a camera and an input interface such as a touch screen or buttons.

[0027] The apparatus 110 further includes an event sensor 24, such as, for example, a luminance sensor that detects the level of ambient luminance. These events are likely to cause changes in the ambient luminance of the environment of the apparatus 110. These events include, but are not limited to, the detection of a specific level of luminance in the environment of the apparatus 110, particularly light rays such as sunlight rays.

[0028] Also, such a controller 22 can execute instructions for executing a computer program configured to process, for example, requests / instructions / data transmitted and received between the control unit 8 of the housing 1.

[0029] Further, the controller 22 can execute a computer program, also referred to as an "application" or "app". More specifically in this regard, the application is an "application for adjusting the contrast of a display device". Thus, when executed by the controller 22, this application can generate at least one instruction aimed at ensuring immediate or automatic management of the contrast of the display device.

[0030] When this application is executed by the electronic device 110, an interface generated by the execution of this application is displayed on the screen of this device 110, and the user can, by interacting with this interface, · Set a luminance setting value corresponding to automatic / dynamic contrast management of the display device, · Adjust the contrast of this display device and respond to immediate management of the level of contrast required according to the vision of the user of the display device can be done.

[0031] Therefore, it is understood that the controller 22 can generate instructions for controlling / adjusting the contrast of the display device, particularly according to the brightness setting value transmitted to the control unit 8 of this housing 1. Therefore, under these conditions, the control unit 8 controls / adjusts this contrast according to both the brightness measured by this unit 8 and the brightness setting value to be respected. To do this, the control unit 8 is configured to appropriately control / instruct the dynamic brightness changing device 7.

[0032] In some embodiments, this controller 22 can generate instructions for controlling / adjusting the contrast of the function display device. Therefore, the said instructions relate to the brightness setting value transmitted to the control unit 8 of this housing 1. Under these conditions, the control unit 8 dynamically controls / adjusts this contrast according to both the brightness measured by this unit 8 using its event sensor 25 and the brightness setting value to be respected. Such a control unit 8 is configured to appropriately control / command the dynamic brightness changing device 7. Therefore, the controller 22 of this electronic device 110, together with the control unit 8 provided with its sensor 25, is configured to be useful for controlling the dynamic brightness changing device 7 to ensure the adjustment, particularly the dynamic adjustment, of the contrast of the display device. Also, these embodiments can bring about the change of the said setting value to be followed, and the change of the setting value is transmitted by the controller 22 of the device 110 as soon as one or more events are detected by the event sensor 24 of the device 110. Therefore, the electronic device 110, together with the control unit 8 provided with its sensor 25, is configured to be useful for controlling the dynamic brightness changing device 7 to adjust the contrast of the display device. In an alternative embodiment, the electronic device 110 provided with its sensor 24, together with the control unit 8 provided with its sensor 25, is configured to be useful for controlling the dynamic brightness changing device 7 to adjust the contrast of the display device.

[0033] The controller 22 can further generate instructions for controlling / adjusting the contrast of the display device according to this contrast adjustment level, and the instructions are transmitted to the control unit 8 of this housing 1. Therefore, under these conditions, the control unit 8 controls / adjusts the contrast of the display device according to the adjustment level selected by the user from the interface generated by the execution of the application by the device 110. To do this, the control unit 8 is configured to appropriately control / instruct the dynamic brightness changing device 7.

[0034] Therefore, it is understood that the electronic device 110 is configured to adjust the contrast of the display device by generating and transmitting at least one control instruction for the dynamic brightness changing device 7 of this crystal 6. Therefore, based on this, the control unit 8 of the housing 1 is configured to change the contrast of the display device according to at least one control instruction for the dynamic brightness changing device received by this device 10.

[0035] Also, as described above, the case 12 of the clock 10 is arranged at a distance from the inner peripheral wall 17 of the housing 4 or held with a distance 19 or with a gap 19 between due to the reversible fastening device 13 of the housing 1, and is arranged in the heat protection housing 1. In other words, such a fastening device 13 can form a gap 19 between the protection case 12 and the functional elements of the housing 1 forming the housing 4. In this configuration, the fastening device 13 helps to reduce or even remove the heat conduction between the inner peripheral wall 17 of the intermediate part 9a (or of the housing 4) and / or the back part 9b and / or between the crystal 6 and the case 12 of the clock 10, especially between the entire outer surface of this case 12. This entire outer surface includes the upper surface provided with the crystal 11 of the case 12 of the clock 10, the lower surface provided with the back part of the case 12, and the outer peripheral wall of the intermediate part of this case 12.

[0036] In this configuration, the fastening device 13 for reversibly fastening the case 12 of the clock 10 to the inner peripheral wall 17 of the housing 4 of this housing 1 can include the following. · A connecting member having first and second ends respectively capable of being connected to the case 12 of the clock 10 and the inner peripheral wall 17 of the interior 4 of this housing 1. The body of each member has a specific structure that helps reduce heat loss to the external environment of the housing 1 and thus ensures a stable internal temperature within the case 12 of the clock 10. · A connecting member configured to ensure the magnetic levitation of the case 12 of the clock 10 in the interior 4. In fact, these connecting members are configured to secure and maintain the spacing 19 between the case 12 and the functional element 15 forming the interior 4 of the housing 1. Such a connecting member helps reduce or even eliminate the heat conduction between the inner peripheral wall 17 and / or the back 9b and / or the crystal 11 of the intermediate part 9a and the case 12 of the clock 10, particularly the entire outer surface of this case 12.

[0037] Note that the case 12 is included in the clock 10, and the clock 10 can be an electronic clock such as a quartz clock, or a mechanical clock or an electromechanical clock.

[0038] The mechanical parts and / or functional parts 5 of the clock 10 include, but are not limited to, a clock movement, a display device such as a dial, hands, rings, packings, and / or electronic parts and / or electrical parts. It should be particularly noted that such electronic parts and / or electrical parts include, for example, a display device, a processor, a memory, an energy storage component, a motor, an integrated circuit, and an electronic oscillator.

[0039] In this regard, the housing 1 includes an intermediate part 9a to which a bracelet 9c is attached that enables the user of this protection device 120 to wear it. This housing 1 further includes the crystal 6 and the back 9b described above. In this housing 1, it should be noted that the crystal 6 preferably has a surface that is substantially larger or strictly larger than the crystal 11 of the case 12 of the clock 10. In other words, the inner surface 16 of the crystal 6 has a surface that is substantially larger or strictly larger than the upper surface of the crystal 11 of the clock 10.

[0040] As seen so far, the functional elements 15 such as the crystal 6, the intermediate part 9a and the back part 9b of this housing 1 together define the interior 4 of this housing 1 that can receive the case 12 of the clock 10. These three elements 15 of the housing 1, namely, the intermediate part 9a, the crystal 6 and the back part 9b, can be separate elements joined to each other to form this interior 4. Alternatively, the intermediate part 9a and the back part 9b of the housing 1 can be made integrally, and the said integral part defines an opening on the opposite side of the back part 9b, and the opening can be closed by the crystal 6 in a reversible and sealed manner. Alternatively, the intermediate part 9a and the crystal 6 of the housing 1 of the clock 10 can be made integrally, and the said integral part defines an opening on the opposite side of the crystal 6, and the opening can be closed by the back part 9b in a similarly reversible and sealed manner.

[0041] The intermediate part 9a and the back part 9b are preferably made of, but not limited to and not exhaustive of, a metal material, glass, carbon fiber or a thermosetting or thermoplastic polymer resin reinforced with glass fiber, and further a ceramic material. In addition, when the intermediate part 9a and the back part 9b are transparent or translucent, for example, made of glass, the inner peripheral wall 17 of the intermediate part 9a and the inner surface 18 of the back part 9b can be coated with a metal coating such as a silver layer or a similar reflective coating.

[0042] Also, in this housing, when the case 12 of the clock 10 is disposed in the interior 4, the space defined between this case 12 and the inner peripheral wall 17 of the intermediate part 9a, the back part 9b and the crystal 6 is either without material or substantially empty. In other words, the interior 4 is under vacuum or in a state close to vacuum.

[0043] Therefore, in this configuration, it is understood that this thermal protection housing 1 has the same properties and characteristics as the well-known Dewar tube / container in the prior art. As already described, the properties and characteristics of this thermal protection housing 1 help to provide good heat insulation to the housing 1 against extreme temperatures that can extend to the external environment where such a housing 1 can be disposed.

[0044] Also, it should be noted that the mechanical and / or functional parts 5 of the watch 10 can be non-magnetic and / or the case 12 of the watch 10 can be made of or coated with a material that enables these parts to be insulated from a magnetic field.

[0045] Furthermore, the fastening device 13 serves to arrange the case 12 of the watch 10 within the housing 1 such that the crystal 11 of this case 12 of the watch 10 faces the crystal 6 of the housing 1 and information on the dial and / or display interface of this watch 10 can be perceived by a user wearing the protection device 120 through the transparent crystal 6 of the housing 1.

[0046] Thus, such a protection device 120 provides very good thermal insulation from the external environment to the mechanical and / or functional parts 5 of the watch 10 by reducing or even preventing heat loss due to radiation from the parts arranged within the case 12 of the watch 10 over a long period. Thus, when the temperature outside the housing 1 reaches extreme values, the temperature within the enclosure 4 is substantially equal to the temperature within the case 12 of the watch 10 when the case 12 of the watch 10 is mounted within the housing 1 and typically remains at about 20 °C. Note that regardless of the temperature conditions of the environment of the thermal protection housing 1, the temperature present within the case 12 of the watch 10 does not prevent the accurate operation of the watch 10. This temperature is maintained for a period that is 2 to 18 times the period during which the case 12 of the watch 10 can maintain the operating temperature of its parts when the case 12 of the watch 10 is placed directly in such an environment having such a temperature, particularly an extreme temperature (i.e., when placed outside the housing 1 of the protection device 120). Thus, it is clear that such a configuration serves to protect the mechanical and / or functional parts 5 of the watch 10 and ensures that they operate optimally under extreme external temperature conditions.

[0047] Needless to say, the present invention is not limited to the embodiments described above, and various simple modifications and alternative embodiments can be envisioned by those skilled in the art without departing from the scope of the present invention as defined by the appended claims.

Claims

1. A contrast adjustment system (100) for a display device of a clock (10), wherein a case (12) of the clock (10) can be detachably arranged in a thermal protection housing (1) for mechanical and / or functional parts (5) of the clock (10), and the contrast adjustment system (100) comprises: - the thermal protection housing (1), - an enclosure (4) for thermally protecting the mechanical and / or functional parts (5) of the clock (10), the enclosure (4) being formed by a functional element (15) of the thermal protection housing (1), the functional element (15) comprising an intermediate part (9a), a back part (9b), and a crystal (6) including a dynamic brightness changing device (7) for dynamically changing the brightness of the visible surface of the display device, the enclosure (4); - a reversible fastening device (13) for fastening the case (12) of the clock (10) to the enclosure (4) while keeping the case (12) of the clock (10) separated from the functional element (15); - a control unit (8) connected to the dynamic brightness changing device (7) of the crystal (6), the control unit (8) comprising an event sensor (25) for detecting an event that may cause a change in the light intensity in the ambient environment of the thermal protection housing The thermal protection housing (1) comprising; - a clock (10) comprising the display device and the case (12) which can be detachably arranged in the enclosure (4) with the display device facing the crystal (6) of the thermal protection housing (1); - an electronic device (110) configured to generate at least one instruction for controlling the dynamic brightness changing device (7) of the crystal (6) and to transmit the at least one instruction to the control unit so as to adjust the contrast of the display device A contrast adjustment system (100).

2. The contrast adjustment system (100) according to claim 1, wherein the display device comprises a visible surface that can be used for displaying time information or information related to functions realized by the clock (10), and the visible surface is arranged facing the crystal (6) of the thermal protection housing (1).

3. The display device includes a visible surface that can be used to display time information or information related to functions realized by the clock (10). The visible surface is disposed facing the crystal (6) of the thermal protection housing (1). The dynamic brightness changing device (7) of the crystal (6) is configured to transmit any light radiation entering the interior of the thermal protection housing (1). The contrast adjustment system (100) according to claim 1.

4. The display device includes a visible surface that can be used to display time information or information related to functions realized by the clock (10). The visible surface is disposed facing the crystal (6) of the thermal protection housing (1). The dynamic brightness changing device (7) of the crystal (6) is configured to transmit any light radiation entering the interior of the thermal protection housing (1). The control unit (8) of the thermal protection housing (1) is configured to change the contrast of the display device in response to at least one command for controlling the dynamic brightness changing device (7). The contrast adjustment system (100) according to claim 1.

5. The control unit (8) of the thermal protection housing (1) is connected to the dynamic brightness changing device (7) of the crystal (6) by a connecting element (14). The contrast adjustment system (100) according to claim 1.

6. The display device includes a visible surface that can be used to display time information or information related to functions realized by the clock (10). The visible surface is disposed facing the crystal (6) of the thermal protection housing (1). The dynamic brightness changing device (7) of the crystal (6) is an illuminating element. The contrast adjustment system (100) according to claim 1.

7. The electronic device (110) includes a communication unit (23) and a controller (22) configured to control the communication unit (23). The contrast adjustment system (100) according to claim 1.

8. The electronic device (110) is configured to be connected to the thermal protection housing (1) using a wireless connection technology. The contrast adjustment system (100) according to claim 1.

9. The interior (4) is under vacuum. The contrast adjustment system (100) according to claim 1.

10. The contrast adjustment system (100) according to claim 1, wherein the crystal (6) has a surface area larger than the surface area of the crystal (11) of the case (12) of the clock (10).

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