CN213401208U - OLED display screen with adjustable transparency - Google Patents
OLED display screen with adjustable transparency Download PDFInfo
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- CN213401208U CN213401208U CN202022261546.6U CN202022261546U CN213401208U CN 213401208 U CN213401208 U CN 213401208U CN 202022261546 U CN202022261546 U CN 202022261546U CN 213401208 U CN213401208 U CN 213401208U
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Abstract
The utility model provides a but OLED display screen of adjustable transparency, this display screen includes substrate base plate and OLED display panel, OLED display panel installs on the substrate base plate, OLED display panel includes the cathode layer that sets gradually from the top down, first transmission layer, the luminescent layer, second transmission layer and anode layer, be provided with liquid crystal dimming layer in substrate base plate inside, the light transmittance of liquid crystal dimming layer is changed through the rotation of liquid crystal molecule in the control liquid crystal dimming layer to realize the regulation of liquid crystal dimming layer transparency. The liquid crystal dimming layer can adjust the transparency of the liquid crystal euphotic layer by controlling the magnitude of the driving voltage through the host, and when the background light source is too strong, the liquid crystal dimming layer can reduce the influence of the background light source on the display effect by reducing the self transparency, thereby avoiding the influence on the display effect of the display screen caused by too strong light of the background light source.
Description
Technical Field
The utility model relates to a display screen technical field, in particular to OLED display screen of adjustable transparency.
Background
OLEDs, i.e. organic light emitting diodes, are reputed to be "illusive displays". The display principle of the OLED is mainly that the OLED is driven by an electric field, and the organic semiconductor material and the light-emitting material emit light after being injected and compounded by a carrier. In essence, an ITO glass transparent electrode is used as an anode of the device, a metal electrode is used as a cathode, electrons are transmitted to an electron transmission layer from the cathode through power supply driving, holes are injected to the hole transmission layer from the anode and then are respectively transferred to a light-emitting layer, excitons are generated after the holes meet each other, luminous molecules are excited, and a light source is generated after radiation.
In the existing OLED display, the OLED display is generally mounted on a substrate, and the substrate is made of a transparent material and serves as a background of the OLED display. However, if the light source behind the substrate is too strong, the overall display effect of the OLED display screen is affected.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims at providing a can adjust OLED display screen of base plate transparency.
In order to realize above-mentioned purpose, the utility model provides an OLED display screen includes substrate base plate and OLED display panel, OLED display panel installs on the substrate base plate, OLED display panel includes the cathode layer that sets gradually from the top down, first transmission layer, luminescent layer, second transmission layer and anode layer, is provided with liquid crystal dimming layer in substrate base plate inside, changes the light transmittance of liquid crystal dimming layer through the rotation of liquid crystal molecule in the control liquid crystal dimming layer to realize the regulation of liquid crystal dimming layer transparency.
In above-mentioned scheme, if the ambient light is too strong, can suitably reduce the transmittance through liquid crystal dimming layer, alleviate the ambient light to OLED display screen display effect's interference, if the ambient light is not strong, need not to reduce the transmittance through liquid crystal dimming layer, no matter the ambient light is strong like this or weak, as long as adjust the transmittance through liquid crystal dimming layer, all can avoid the influence of ambient light source to OLED display screen display effect.
Preferably, the substrate layers include a first substrate layer and a second substrate layer, the first substrate layer is located above the second substrate layer, and the liquid crystal dimming layer is disposed between the first substrate layer and the second substrate layer.
Further, a receiving cavity is formed between the first substrate layer and the second substrate layer, and the liquid crystal dimming layer is arranged inside the receiving cavity.
In a further aspect, the first substrate layer and the second substrate layer are sealed with a sealant.
In the above scheme, the substrate layers include a first substrate layer and a second substrate layer, and in the process of laminating the first substrate layer and the second substrate layer together, a receiving cavity is formed between the first substrate layer and the second substrate layer, and a liquid crystal material is injected into the receiving cavity to form the liquid crystal dimming layer. And then sealing between the first substrate layer and the second substrate layer by using a sealant, so that the liquid crystal material can be prevented from leaking from between the first substrate layer and the second substrate layer.
In a further embodiment, the first transport layer comprises an electron injection layer and an electron transport layer, the electron injection layer being connected to the cathode layer and the electron transport layer being connected to the light-emitting layer.
In a further embodiment, the second transport layer comprises a hole injection layer and a hole transport layer, the hole injection layer is connected to the anode layer, and the hole transport layer is connected to the light-emitting layer.
In the above scheme, the hole injection layer has the function of preventing the anode material from generating oxygen in long-time operation, and further oxidizing the organic layer to generate dark spots, so the hole injection layer needs to be inserted between the substrate and the hole transport layer to prolong the service life. The hole transport layer functions to help positively charged holes move to the organic light emitting layer. The electron transport layer functions to output electrons to the organic light emitting layer for light emission in combination with holes.
In a further embodiment, the anode layer is formed from indium tin oxide.
In the above scheme, indium tin oxide, also called ITO, has good conductivity and light transmittance. The organic polymer material has good electrical property, can become a special conductor material after being added with proper conductive materials, and can be used for transmitting electrical signals. The materials are transparent under the condition of no light emission, and the display effect of the light-emitting layer cannot be influenced.
In a further aspect, the cathode layer is made of a metal material, and the metal material includes silver, aluminum, magnesium, and lithium.
In the above scheme, the cathode layer in the OLED display screen is usually made of a metal material, but the metal material is easily oxidized, so that the service life of the cathode layer is shortened. In order to enhance the stability of the cathode layer, a low work function metal with active properties and a high work function metal with stable chemical properties are evaporated together to form a metal cathode, so that the quantum efficiency and the stability of the device are improved. For example, magnesium-silver alloy and aluminum-lithium alloy are used to make the cathode.
The liquid crystal dimming layer comprises a plurality of dimming areas, and the light transmittance of each dimming area is changed by controlling the driving voltage value output to each dimming area, so that the regional dimming is realized.
In the scheme, the liquid crystal dimming layer can be divided into a plurality of dimming areas, and each dimming area is electrically connected with the host through the flexible circuit board. The host can respectively and independently output driving voltage to each dimming area, and different transparency effects of each dimming area can be achieved by outputting different driving voltages to each dimming area, so that regional dimming of the liquid crystal dimming layer is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an OLED display screen provided by an embodiment of the present invention.
Detailed Description
In order to facilitate a better understanding of the invention, the invention will be further explained below with reference to the accompanying drawings of the related embodiments. The embodiments of the invention are shown in the drawings, but the invention is not limited to the preferred embodiments described above. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, the OLED display panel provided in this embodiment includes a substrate base plate and an OLED display panel, and the OLED display panel is mounted on the substrate base plate. The OLED display panel comprises a cathode layer 1, a first transmission layer, a light emitting layer 4, a second transmission layer and an anode layer 7 which are sequentially arranged from top to bottom. The first transport layer comprises an electron injection layer 2 and an electron transport layer 3, the electron injection layer 2 is connected with the cathode layer 1, and the electron transport layer 3 is connected with the light emitting layer 4. The second transport layer comprises a hole injection layer 6 and a hole transport layer 5, the hole injection layer 6 is connected with the anode layer 7, and the hole transport layer 5 is connected with the light-emitting layer 4. The substrate includes a first substrate layer 8 and a second substrate layer 10, the first substrate layer 8 is located above the second substrate layer 10, a receiving cavity (not shown in the figure) is formed between the first substrate layer 8 and the second substrate layer 10, and the liquid crystal light modulation layer 9 is disposed inside the receiving cavity.
In this embodiment, the hole injection layer 6 serves to prevent the anode layer 7 from generating oxygen during a long-term operation and further oxidize the hole transport layer 5 and the light emitting layer 4, so that the hole injection layer 6 needs to be interposed between the anode layer 7 and the hole transport layer 5 to protect the hole transport layer 5 and the light emitting layer 4. The hole transport layer 5 functions to assist positively charged holes to move to the light emitting layer 4. The electron transport layer 3 functions to output electrons to the light emitting layer 4 for light emission in combination with holes.
In this embodiment, the anode layer 7 is made of indium tin oxide, and the cathode layer is made of metal materials, including silver, aluminum, magnesium, and lithium. Indium tin oxide, also known as ITO, has good electrical conductivity and light transmittance. The organic polymer material has good electrical property, can become a special conductor material after being added with proper conductive materials, and can be used for transmitting electrical signals. These materials are transparent when they do not emit light, and do not affect the display effect of the light-emitting layer 4. The cathode layer 1 is generally made of a metal material, but since the metal material is easily oxidized, the service life of the cathode layer 1 is shortened. In order to enhance the stability of the cathode layer 1, a low work function metal with active properties and a high work function metal with stable chemical properties are usually mixed together to form the cathode layer 1, so that the quantum efficiency and the stability of the device are improved. For example, magnesium: silver (10:1), lithium: an aluminum (0.6% Li) alloy was made into the cathode. This prevents the cathode layer 1 from being oxidized, and the service life of the cathode layer 1 is prolonged.
In this example, the hole transport layer 5 was made of N, N '-diphenyl-N, N' -di (2-naphthyl) -1, 1 '-biphenyl-4, 4' -diamine (NPB for short). The electron transport layer 3 is made of 8-hydroxyquinoline aluminum (Alq3), and the 8-hydroxyquinoline aluminum (Alq3) has good light-emitting performance. The light-emitting layer 4 is made of an organic polymer material.
In this embodiment, the OLED display screen passes through the flexible circuit board and is connected with the host computer electricity, the host computer passes through the flexible circuit board to OLED display screen output signal of telecommunication, the signal of telecommunication gets into from anode layer 7 and cathode layer 1, then reach luminescent layer 4 through first transmission layer and second transmission layer, be provided with a plurality of pixel on luminescent layer 4, every pixel can send red, green, the light of three kinds of different colours of blue, the pixel can adjust red through the received signal of telecommunication, green, the shared proportion of three kinds of different chromatic lights of blue, thereby reach the display effect of different colours. A liquid crystal dimming layer 9 is arranged in the substrate layer, the liquid crystal dimming layer 9 is electrically connected with a host through a flexible circuit board, and the host outputs driving voltage to the liquid crystal dimming layer 9. The light sensing device senses the intensity of background light and feeds the sensed light intensity back to the host, the host adjusts the magnitude of driving voltage through the received sensing effect, and the host controls the rotation of liquid crystal molecules in the liquid crystal dimming layer 9 to change the light transmittance of the liquid crystal dimming layer, so that the adjustment of the transparency of the liquid crystal dimming layer 9 is realized. If the background light is too strong, the transmittance can be properly reduced through the liquid crystal dimming layer 9 to reduce the interference of the background light on the display effect of the OLED display screen, if the background light is not strong, the transmittance does not need to be reduced through the liquid crystal dimming layer 9, so that the influence of the background light on the display effect of the OLED display screen can be avoided as long as the transmittance is adjusted through the liquid crystal dimming layer 9 no matter the background light is strong or weak. If the substrate layer is directly made of opaque materials, although the influence of a background light source on the OLED display screen can be avoided, the display screen looks darker, and the transparency of the background of the display screen cannot be adjusted, so that the overall visual effect is influenced. The working principle of the liquid crystal dimming layer 9 can refer to the chinese patent application publication No. CN 110286527A. The working principle of the liquid crystal dimming layer 9 belongs to the prior art, but does not belong to the protection scope of the utility model.
In the present embodiment, the OLED display panel is mounted on a substrate base plate. The substrate base plate comprises a first substrate layer 8 and a second substrate layer 10, a containing cavity is formed between the first substrate layer 8 and the second substrate layer 10 in the process of pressing the first substrate layer 8 and the second substrate layer 10 together, and the liquid crystal dimming layer 9 can be formed by injecting liquid crystal materials into the containing cavity. Then, the space between the first substrate layer 8 and the second substrate layer 10 is sealed with a sealant, and the liquid crystal material can be prevented from leaking from the space between the first substrate layer 8 and the second substrate layer 10. The thickness of the liquid crystal dimming layer 9 is preferably in the range of 0.4mm to 0.5mm, and of course, the thickness of the liquid crystal dimming layer 9 can also be determined according to the actual requirement of the display screen space. The liquid crystal dimming layer 9 is not in a fixed shape, and the shape of the liquid crystal dimming layer 9 corresponds to the shape of the display screen, so that the shape of the liquid crystal dimming layer 9 can be rectangular, circular or even a curved surface.
In this embodiment, the liquid crystal dimming layer 9 may be divided into a plurality of dimming areas, and each dimming area is electrically connected to the host through a flexible circuit board. The host can respectively output driving voltage to each dimming region independently, and different transparency effects of each dimming region can be achieved by outputting different driving voltages to each dimming region, so that the partition dimming of the liquid crystal dimming layer 9 is realized. The diversified display requirements of the OLED display screen can be met by the regional dimming of the liquid crystal dimming layer 9, for example, when a plurality of pictures are displayed on the OLED display screen at the same time, if the requirements of each picture on the background transparency are different, the visual requirements of each picture can be met by the regional dimming of the liquid crystal dimming layer 9.
The above-described embodiments describe the technical principles of the present invention, and these descriptions are only for the purpose of explaining the principles of the present invention, and should not be interpreted as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. An OLED display screen of adjustable transparency which characterized in that:
the OLED display screen comprises a substrate base plate and an OLED display panel, the OLED display panel is installed on the substrate base plate, the OLED display panel comprises a cathode layer, a first transmission layer, a light emitting layer, a second transmission layer and an anode layer which are sequentially arranged from top to bottom, a liquid crystal dimming layer is arranged inside the substrate base plate, the light transmittance of the liquid crystal dimming layer is changed by controlling the rotation of liquid crystal molecules in the liquid crystal dimming layer, and therefore the transparency of the liquid crystal dimming layer is adjusted.
2. The OLED display screen of claim 1, wherein:
the substrate comprises a first substrate layer and a second substrate layer, the first substrate layer is positioned above the second substrate layer, and the liquid crystal dimming layer is arranged between the first substrate layer and the second substrate layer.
3. The OLED display screen of claim 2, wherein:
an accommodating cavity is formed between the first substrate layer and the second substrate layer, and the liquid crystal dimming layer is arranged inside the accommodating cavity.
4. The OLED display screen of claim 3, wherein:
the first substrate layer and the second substrate layer are sealed by a sealant.
5. The OLED display screen of claim 1, wherein:
the first transport layer comprises an electron injection layer and an electron transport layer, the electron injection layer is connected with the cathode layer, and the electron transport layer is connected with the light emitting layer.
6. The OLED display screen of claim 1, wherein:
the second transmission layer comprises a hole injection layer and a hole transmission layer, the hole injection layer is connected with the anode layer, and the hole transmission layer is connected with the luminous layer.
7. The OLED display screen of claim 1, wherein:
the anode layer is made of indium tin oxide.
8. The OLED display screen of claim 1, wherein:
the cathode layer is made of metal materials, and the metal materials comprise silver, aluminum, magnesium and lithium.
9. The OLED display screen of any one of claims 1-8, wherein:
the liquid crystal dimming layer comprises a plurality of dimming areas, and the light transmittance of each dimming area is changed by controlling the driving voltage value output to each dimming area, so that regional dimming is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022261546.6U CN213401208U (en) | 2020-10-11 | 2020-10-11 | OLED display screen with adjustable transparency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022261546.6U CN213401208U (en) | 2020-10-11 | 2020-10-11 | OLED display screen with adjustable transparency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815363A (en) * | 2022-05-17 | 2022-07-29 | 武汉华星光电半导体显示技术有限公司 | Display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815363A (en) * | 2022-05-17 | 2022-07-29 | 武汉华星光电半导体显示技术有限公司 | Display device |
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