TWI461965B - Writing board and writing equipment with the same - Google Patents

Description

Writing board and writing device having the same

The invention relates to a writing board and a writing device, in particular to a writing board and a writing device which are environmentally friendly and do not need to manually remove a writing.

At present, writing devices widely used in teaching include blackboards and chalks, which are written on blackboard using chalk. After writing, you need to erase the writing with a blackboard eraser. This traditional writing device requires manpower and time to erase the writing after writing, and generates a large amount of dust, which not only pollutes the environment, but also seriously threatens human health.

Another writing device includes a whiteboard and a matching red, blue or black writing pen, which uses the ink in the writing pen to write on the whiteboard. After the writing is completed, the writing is also erased. Although the writing device can avoid dust pollution, the ink of the writing pen often contains toxic and harmful solvents such as formaldehyde and halide, which can also pollute the environment and affect people's health.

In view of this, it is necessary to provide an environmentally friendly writing board that does not require manual removal of writing.

A writing board includes a first electrode layer, a writing layer, a second electrode layer, an internal light source first substrate, and a second substrate. The first electrode layer and the second electrode layer are respectively located on opposite sides of the writing layer for supplying a voltage to the writing layer. The writing layer is made of a material having photochromic properties and electroluminescence properties, and is used for The structural change occurs under the illumination of the internal light source to lose the electroluminescence property, and the structure having the electroluminescence property is restored under the illumination of the external light source, so that the writing plate forms a light-emitting trajectory corresponding to the illumination trajectory of the external light source. The first electrode layer is a transparent material. The first substrate is located on a side of the first electrode layer away from the writing layer. The second substrate is located on a side of the second electrode layer away from the writing layer to protect the second electrode layer.

A writing device comprising a writing pen and a writing pad as described above. The external light source is disposed on the writing pen.

The writing device provided by the technical solution uses the writing layer of the writing board to lose the electroluminescence property under the illumination of the internal light source to remove the writing, and restores the property of the electroluminescence under the illumination of the external light source of the writing pen to form another writing It is convenient for writing, and it is not necessary to manually remove the writing and writing, thereby improving writing efficiency. In addition, the use of the writing device does not cause dust pollution, and can also avoid the use of solvents that pollute the environment and endanger health.

100‧‧‧ writing device

11‧‧‧ writing pen

12‧‧‧ writing board

110‧‧‧ grip

111‧‧‧ writing department

112‧‧‧External light source

113‧‧‧First control switch

120‧‧‧First substrate

121‧‧‧First electrode layer

122‧‧‧ writing layer

123‧‧‧Second electrode layer

124‧‧‧second substrate

125‧‧‧Internal light source

126‧‧‧Shell

1250‧‧‧ first light source

1251‧‧‧second light source

FIG. 1 is a schematic structural diagram of a writing device provided by an embodiment of the present technical solution.

Figure 2 is a cross-sectional view taken along line II-II of Figure 1.

The writing board and the writing device provided by the technical solution will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 and FIG. 2 together, the embodiment provides a writing device 100 including a writing pen 11 and a writing pad 12.

The writing pen 11 can be substantially cylindrical, having an opposite grip portion 110 and a book Write unit 111. The writing portion 111 is provided with an external light source 112. The external light source 112 can be a light emitting diode (LED) that emits light having a wavelength of 520-650 nm. The grip portion 110 is provided with a first control switch 113. The first control switch 113 is configured to control the illumination of the external light source 112.

The writing board 12 can be square and used to form a writing track at the illumination of the external light source 112. The tablet 12 includes a first substrate 120, a first electrode layer 121, a writing layer 122, a second electrode layer 123, a second substrate 124, an internal light source 125, and a housing 126.

The first substrate 120 is used for the light emitted by the external light source 112 to pass through, which is a transparent material. In this embodiment, the first substrate 120 is a square transparent glass substrate. The operator can write on the side close to the first substrate 120.

The first electrode layer 121 is located on one side of the writing layer 122 and is a transparent material. The first electrode layer 121 is an anode layer. In this embodiment, the first electrode layer 121 is formed of a transparent Indium-Tin Oxide (ITO) film, which is formed on the first substrate 120 by sputtering.

The writing layer 122 is made of a material having photochromic properties and electroluminescence properties, and is used for structural changes under the illumination of the internal light source 125 to lose electroluminescence properties, and is irradiated by the external light source 112. The structure having electroluminescence properties is restored, so that the writing board 12 forms a luminescent trajectory corresponding to the illuminating trajectory of the external light source 112. The thickness of the writing layer 122 is 180-220 nm, which can be formed on the side of the first electrode layer 121 away from the first substrate 120 by evaporation. In this embodiment, the writing layer 122 is made of a diarylethene compound, and the compound undergoes structural changes under ultraviolet light to lose the characteristics of electroluminescence, and is restored to electricity under illumination of a specific wavelength of light. The structure of the luminescence property is emitted after being energized. In this embodiment, the writing layer 122 has a thickness of 200 nm and is made of stilbene (C ₁₄ H ₁₂ ). 1,2-stilbene (C ₁₄ H ₁₂ ), also known as isoindole, can be obtained by reacting benzylmagnesium bromide with benzaldehyde and by ultraviolet light. 1,2-stilbene can emit fluorescence when it is energized, and a closed-loop reaction occurs under ultraviolet light irradiation, and the electroluminescence property is lost. When the closed-loop body is exposed to light at 520-650 nm, the ring-opening reaction is resumed. The structure is such that it can be re-fluorescent after being energized, and its reaction chemical equation is as follows:

It can be understood that the writing layer 122 does not necessarily use stilbene, but also other diarylethene compounds, such as diarylethene containing maleic anhydride and perfluorocyclopentene bridging groups. The compounds also have superior photochromic properties. Of course, the writing layer 122 may also be other photochromic materials such as spiropyrans, salicylaldehyde aniline-based Schiffs, fulgides, and azobenzenes.

The second electrode layer 123 is located on the other side of the writing layer 122 away from the first electrode layer 121 for common connection with the first electrode layer 121 to an external circuit, thereby providing the writing layer 122 Voltage. The second electrode layer 123 is a cathode layer, which may also be formed on the writing layer 122 by evaporation. The second electrode layer 123 is generally made of a metal or metal alloy material, such as aluminum, aluminum lithium alloy, magnesium silver alloy, and the like.

The second substrate 124 is located on a side of the second electrode layer 123 away from the writing layer 122 for protecting the second electrode layer 123. In this embodiment, the second substrate 124 is also glass. Of course, the material of the second substrate 124 is not limited to glass. It does not necessarily require transparency.

The internal light source 125 is for emitting ultraviolet light. In this embodiment, the internal light source 125 includes a first light source 1250 and a second light source 1251. The first light source 1250 and the second light source 1251 are respectively located at opposite ends of the writing layer 122, and the emitted ultraviolet light can be uniformly irradiated onto the writing layer 122 to completely remove the writing track. Of course, the internal light source 125 can also be a backlight module including a light source and a light guide plate. Thus, the writing layer 122 can also be irradiated with ultraviolet light. The internal light source 125 can be controlled by a second control switch (not shown).

The outer casing 126 is used to encapsulate the first substrate 120, the first electrode layer 121, the writing layer 122, the second electrode layer 123, the second substrate 124, and the internal light source 125 together. The shape of the outer casing 126 matches the shape of the first substrate 120 and the second substrate 124. In this embodiment, the outer casing 126 is slightly longer than the first substrate 120, and has a thickness slightly larger than the first substrate 120, the first electrode layer 121, the writing layer 122, the second electrode layer 123, and the second substrate. The square frame of the total thickness of 124.

When writing using the writing device 100 of the present technical solution, the following steps may be taken: first, the writing layer 122 is energized, and the internal light source 125 is turned on by the second control switch, at which time the writing layer 122 has a closed loop reaction. Loss of electroluminescence, thereby removing possible writing on the writing board 12; secondly, turning off the internal light source 125, opening the external light source 112 of the writing pen 11 by the first control switch 113, causing the external light source 112 illuminates the writing board 12 where it is desired to form a writing, and the writing layer 122 is re-opened by the external light source 112 to restore the original structure, thereby emitting fluorescence and forming a writing. If the writing board 12 is full, the above steps can be repeated to remove the original writing and writing a new book writing.

Of course, the shape of the writing board 12 is not limited to a square shape, and may be a circular shape, a polygonal shape or other irregular shapes. The tablet 12 can have a large surface area for classroom teaching or a small writing pad that can be carried.

The writing device provided by the technical solution uses the writing layer of the writing board to lose the electroluminescence property under the illumination of the internal light source to remove the writing, and restores the property of the electroluminescence under the illumination of the external light source of the writing pen to form a writing writing. It is convenient to write, and it is not necessary to manually remove the writing and writing, which improves the writing efficiency. In addition, the use of the writing device does not cause dust pollution, and can also avoid the use of solvents that pollute the environment and endanger health.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧ writing device

11‧‧‧ writing pen

12‧‧‧ writing board

110‧‧‧ grip

111‧‧‧ writing department

112‧‧‧External light source

113‧‧‧First control switch

120‧‧‧First substrate

126‧‧‧Shell

Claims (8)

A writing board comprising a first electrode layer, a writing layer, a second electrode layer and an internal light source, wherein the first electrode layer and the second electrode layer are respectively located on opposite sides of the writing layer for the writing layer Providing a voltage, the writing layer being made of a material having photochromic properties and electroluminescence properties for structural changes under the illumination of the internal light source to lose electroluminescence properties and recovering under illumination from an external light source a structure having electroluminescence properties, such that the writing plate forms a light-emitting track corresponding to an illumination path of an external light source, the first electrode layer is a transparent material, and the writing plate further includes a first substrate and a second substrate. The first substrate is located on a side of the first electrode layer away from the writing layer, and the second substrate is located on a side of the second electrode layer away from the writing layer to protect the second electrode layer . The writing board of claim 1, wherein the writing layer has a thickness of 180-220 nm. The writing board of claim 1, wherein the writing layer material is a diarylethene compound. The writing board of claim 1, wherein the internal light source is for emitting ultraviolet light. The writing board of claim 1, wherein the internal light source comprises a first light source and a second light source, and the first light source and the second light source are respectively located at opposite ends of the writing layer. The writing board of claim 1, further comprising a housing for using the first substrate, the first electrode layer, the writing layer, the second electrode layer, the internal light source, and the second substrate Packaged in one. A writing device comprising a writing pen and a book as claimed in any one of claims 1 to 6 a writing board, the external light source being disposed on the writing pen. The writing device of claim 7, wherein the external light source emits light at a wavelength of 520-650 nm.