CN109742130B - Organic electroluminescent display device and control method - Google Patents
Organic electroluminescent display device and control method Download PDFInfo
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- CN109742130B CN109742130B CN201910092031.7A CN201910092031A CN109742130B CN 109742130 B CN109742130 B CN 109742130B CN 201910092031 A CN201910092031 A CN 201910092031A CN 109742130 B CN109742130 B CN 109742130B
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Abstract
The invention discloses an organic electroluminescent display device and a control method. The organic electroluminescent display device includes: the substrate is a transparent substrate; the light-emitting device comprises a plurality of light-emitting element groups, wherein each light-emitting element group comprises an organic light-emitting diode, a long afterglow thin film, a voltage regulating element and a light intensity sensor, the organic light-emitting diodes are arranged on a substrate, the light-emitting sides of the organic light-emitting diodes face the substrate, the long afterglow thin film is arranged on one side, far away from the organic light-emitting diodes, of the substrate, the light-emitting color of the long afterglow thin film after being excited by the organic light-emitting diodes is the same as the light-emitting color of the organic light-emitting diodes, the organic light-emitting diodes are connected with the voltage regulating element, the light intensity sensor is arranged on one. Therefore, the organic electroluminescent display device has the advantages of low energy consumption, long service life and high display quality.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic electroluminescent display device and a control method.
Background
The color mixing of three primary color sub-pixels of red, green and blue (R, G, B) is adopted to compound the sub-pixels into a color pixel element, which is a common method for realizing full-color display devices. Firstly, R, G, B Organic Light Emitting Diodes (OLEDs) are prepared, the three-color organic light emitting diodes independently emit light to form a pixel, and then the color mixing ratio of the colors of the three-color organic light emitting diodes is adjusted to generate true color.
However, the current full-color organic electroluminescent display device has the problems of high energy consumption and short service life. Specifically, in the use process of the organic electroluminescent display device, the R, G, B organic light emitting diode is always in a higher excitation state, on one hand, the energy consumption is higher, and on the other hand, the service life of the organic light emitting diode is shortened faster, wherein the service life of the blue organic light emitting diode is shorter, and with the use of the organic electroluminescent display device, the difference of the service lives of the organic light emitting diodes is larger and larger, so that the color difference of the organic electroluminescent display device is further caused, and the display is influenced.
Disclosure of Invention
The present invention aims to alleviate or solve at least to some extent at least one of the above mentioned problems.
In one aspect of the present invention, an organic electroluminescent display device is provided. The organic electroluminescent display device includes: a substrate, which is a transparent substrate; and a plurality of luminous element groups, luminous element group includes organic light emitting diode, long afterglow film, voltage control element and light intensity sensor, wherein, organic light emitting diode sets up on the base plate, just organic light emitting diode's light-emitting side orientation the base plate, long afterglow film sets up the base plate is kept away from one side of organic light emitting diode, just long afterglow film receives luminous colour after organic light emitting diode arouses with organic light emitting diode's luminous colour is the same, organic light emitting diode with voltage control element links to each other, light intensity sensor sets up long afterglow film is kept away from one side of base plate, light intensity sensor with voltage control element links to each other. Therefore, the organic electroluminescent display device has the advantages of low energy consumption, long service life and high display quality.
According to an embodiment of the invention, the long afterglow film consists of a transparent polymer doped with a long afterglow material, said transparent polymer comprising at least one of a polyester, a polyether, a polyamide. Therefore, the transparent polymer can be used for forming the long afterglow material into a film so as to form the long afterglow thin film corresponding to the organic light emitting diodes one by one.
According to an embodiment of the present invention, the organic light emitting diode includes a red organic light emitting diode, a green organic light emitting diode, or a blue organic light emitting diode. Therefore, the organic light emitting diodes with three primary colors of red, green and blue can be used for spatial color mixing and compounding to form the color pixel so as to realize full-color display.
According to the embodiment of the invention, the long afterglow material in the long afterglow thin film corresponding to the red light organic light emitting diode comprises SrTiO3:Pr3+And CaTiO3:Pr3+The long afterglow material in the long afterglow thin film corresponding to the green light organic light emitting diode comprises SrAl2O4:Eu2+,Dy3+And Ca2MgSi2O7The long afterglow material in the long afterglow thin film corresponding to the blue light organic light emitting diode comprises CaAl2O4:Eu2+,Nd3+And Sr4Al11O25:Eu2+,Dy3+At least one of (1). Therefore, after being excited by light, the long afterglow film can emit light with the same color as the corresponding organic light emitting diode, the voltage of the organic light emitting diode can be reduced under the condition of maintaining the preset brightness, the effect of saving energy consumption is achieved, and meanwhile the service life of the organic light emitting diode can be prolonged.
According to an embodiment of the present invention, the organic electroluminescent display device further includes: a control switch connected to the plurality of voltage regulating elements; a gate line connected to the control switch, the gate line configured to control the on/off of the control switch; a data line connected to the control switch, the data line configured to apply a voltage to the plurality of organic light emitting diodes. Therefore, the on-off of the control switch can be controlled through the grid line, the on-off of the organic light emitting diode is further controlled, and when the organic light emitting diode is switched on, voltage can be applied to the organic light emitting diode through the data line, so that the organic light emitting diode works.
According to an embodiment of the present invention, the organic electroluminescent display device further includes: and the transparent fuel thin-film solar cell is positioned on one side of the organic light-emitting diode, which is far away from the substrate, and is electrically connected with the plurality of light-emitting element groups. On the one hand, the solar cell can convert afterglow of the long afterglow film or natural light absorbed by the long afterglow film into electric energy to provide electric energy for the organic light-emitting diode, so that the aim of saving energy consumption is further fulfilled, and on the other hand, when an external circuit connected with the grid line and the data line breaks down, the organic light-emitting diode can be maintained to continuously work through the transparent fuel film solar cell, so that an emergency effect is achieved.
According to an embodiment of the present invention, the organic electroluminescent display device further includes: an electrochromic layer disposed on a side of the transparent fuel thin film solar cell proximate the organic light emitting diode, the electrochromic layer configured to be switchable between a reflective state and a transparent state. When the organic light-emitting diode works, the electrochromic layer is in a reflection state, on one hand, the light emitted by the organic light-emitting diode can be completely used for displaying, the utilization rate of the light is improved, and on the other hand, the solar cell can be prevented from absorbing the light emitted by the organic light-emitting diode. When the organic light-emitting diode does not work, the electrochromic layer is in a transparent state, on one hand, the solar cell can absorb afterglow in the long afterglow film through the electrochromic layer and convert the afterglow into electric energy, on the other hand, the long afterglow film can absorb natural light, store energy and continuously emit light, and the solar cell absorbs the light emitted by the long afterglow film and converts the light into electric energy.
According to an embodiment of the invention, the time for switching the electrochromic layer between the reflective state and the transparent state is 50-2000ms and the switching voltage is 0.25-3V. Therefore, the time for the electrochromic layer to switch between the reflective state and the transparent state is short, the voltage is low, and the effect of the electrochromic layer can be well realized.
In another aspect of the present invention, a method of controlling an organic electroluminescent display device is provided. According to an embodiment of the present invention, the organic electroluminescent display device is as described above, the method comprising: and the organic light emitting diode is made to emit light to excite the long afterglow film corresponding to the organic light emitting diode to emit light, the total light intensity signals of the organic light emitting diode and the long afterglow film are induced by the light intensity sensor, and the voltage applied to the organic light emitting diode is determined to control the light emitting intensity of the organic light emitting diode so as to maintain the total light intensity of the organic light emitting diode and the long afterglow film at a preset value. Therefore, on one hand, the organic electroluminescent display device can be always maintained at preset brightness, the problems of color difference and the like are avoided, the display quality is higher, on the other hand, the voltage of the organic light emitting diode can be reduced, the purpose of saving energy consumption is achieved, on the other hand, the light emitting intensity of the organic light emitting diode can be reduced, and the service life of the organic light emitting diode is prolonged.
According to an embodiment of the present invention, maintaining the total light intensity of the organic light emitting diode and the long persistence film at a predetermined value includes: the light intensity sensor converts the induced light intensity signal into a voltage signal, transmits the voltage signal to the voltage adjusting element, and adjusts the voltage applied to the organic light emitting diode in real time by using the voltage adjusting element so as to maintain the total light intensity of the organic light emitting diode and the long afterglow film at the preset value. Thus, the voltage adjusting element can adjust the voltage applied to the organic light emitting diode in real time according to the voltage signal sensed by the light intensity sensor, so that the organic electroluminescent display device is always maintained at a predetermined brightness.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic configuration diagram of an organic electroluminescent display device according to an embodiment of the present invention;
fig. 2 is a diagram showing an electrical connection relationship of structures of an organic electroluminescent display device according to an embodiment of the present invention;
fig. 3 is a view showing an electrical connection relationship of structures of an organic electroluminescent display device according to another embodiment of the present invention;
fig. 4 shows a schematic configuration diagram of an organic electroluminescent display device according to an embodiment of the present invention; and
fig. 5 is a diagram showing an electrical connection relationship of structures of an organic electroluminescent display device according to an embodiment of the present invention.
Description of reference numerals:
100: a substrate; 200: an organic light emitting diode; 300: a long afterglow film; 400: a light intensity sensor; 500: an electrochromic layer; 600: a transparent fuel thin film solar cell; 700: packaging the film; 800: a light emitting element group; 10: a voltage regulating element; 30: a control switch; 40: a gate line; 50: and a data line.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the present invention, an organic electroluminescent display device is provided. According to an embodiment of the present invention, referring to fig. 1 and 2, the organic electroluminescent display device includes: a substrate 100 and a plurality of light emitting element groups 800 (shown in phantom in fig. 2). Wherein, the substrate 100 is a transparent substrate, each light emitting element group 800 includes an organic light emitting diode 200, a long afterglow film 300, a voltage regulating element 10 and a light intensity sensor 400, the organic light emitting diode 200 is disposed on the substrate 100, and the light emitting side of the organic light emitting diode 200 faces the substrate 100, that is, the side of the substrate 100 away from the organic light emitting diode 200 is the light emitting side, the long afterglow film 300 is disposed on the side of the substrate 100 away from the organic light emitting diode 200, the long afterglow films 300 correspond to the organic light emitting diodes 200 one by one, for example, the long afterglow film 300A corresponds to the organic light emitting diode 200A, the long afterglow film 300B corresponds to the organic light emitting diode 200B, the long afterglow film 300C corresponds to the organic light emitting diode 200C, and the light emitting color of the long afterglow film 300 excited by the organic light emitting diode 200 is the same as the light emitting color of the organic light emitting diode 200, the light intensity sensor 400 is disposed on the side of the long-afterglow thin film 300 away from the substrate 100, the organic light emitting diode 200 is connected to the voltage regulating element 10, and the light intensity sensor 400 is connected to the voltage regulating element 10 of the organic light emitting diode 200 corresponding to the long-afterglow thin film 300. Therefore, the organic electroluminescent display device has the advantages of low energy consumption, long service life and high display quality.
For ease of understanding, the following first briefly describes an organic electroluminescent display device according to an embodiment of the present invention:
as mentioned above, when the current full-color organic electroluminescent display device works, the organic light emitting diode is always in a higher excited state, the energy consumption is higher, and the service life of the organic light emitting diode is shortened faster, so that the difference of the service life of the organic light emitting diode is aggravated, the problems of color difference and the like are caused, and the display is affected.
According to the embodiment of the present invention, by providing the long-afterglow thin film, the light intensity sensor and the voltage adjusting element in the organic electroluminescent display device, when the organic light emitting diode operates, the light emitted by the organic light emitting diode excites the corresponding long-afterglow thin film to emit light, the sum of the light intensities of the organic light emitting diode and the long-afterglow thin film is used as the light emitting intensity of the sub-pixel, and the voltage of the organic light emitting diode can be reduced under the condition that the sub-pixel maintains a predetermined brightness, so that the energy consumption can be reduced, and the light intensity of the organic light emitting diode is reduced, so that the service life of the organic light emitting diode can be prolonged, the light intensity sensor can sense the total light intensity of the organic light emitting diode and the long-afterglow thin film, and convert the light intensity signal into the voltage signal to be sent to the voltage adjusting element, and the voltage adjusting element can adjust, each sub-pixel is kept at the preset brightness, the problems of color difference and the like are avoided, and the organic electroluminescent display device has high display quality.
Compared with the full-color organic electroluminescent display device in the prior art, according to the organic electroluminescent display device of the embodiment of the invention, the light emitted by the organic light emitting diode can excite the long afterglow thin film to emit light, that is, the voltage of the organic light emitting diode can be reduced by means of the long afterglow thin film to emit light under the condition of maintaining the preset brightness, and further the light intensity of the organic light emitting diode can be reduced, and the organic electroluminescent display device can utilize the voltage adjusting element to adjust the voltage applied to the organic light emitting diode in real time according to the voltage signal induced by the light intensity sensor, so that the organic light emitting diode does not need to be always kept in a higher excitation state, thereby achieving the effects of saving energy and prolonging the service life of the device, and simultaneously, the voltage applied to the organic light emitting diode can be adjusted in real time, so that the brightness of the sub-pixel can, the long afterglow film will not be affected by delayed luminescence.
The respective structures of the organic electroluminescent display device will be described in detail below according to specific embodiments of the present invention:
according to an embodiment of the present invention, referring to fig. 1, the organic light emitting diode 200 may include a red organic light emitting diode 200A, a green organic light emitting diode 200B, or a blue organic light emitting diode 200C. Therefore, the organic light emitting diodes with three primary colors of red, green and blue can be used for spatial color mixing and compounding to form the color pixel so as to realize full-color display.
According to the embodiment of the present invention, the long afterglow thin film 300 is made of a transparent polymer doped with a long afterglow material, and the specific type of the transparent polymer is not particularly limited as long as the long afterglow material can be formed into a film without affecting the stimulated emission of the long afterglow material, and those skilled in the art can design the film according to the specific situation. For example, according to a specific embodiment of the present invention, the transparent polymer may include at least one of polyester, polyether, and polyamide. Therefore, the transparent polymer can be used for forming the long afterglow material into a film so as to form the long afterglow thin film corresponding to the organic light emitting diodes one by one.
According to the embodiment of the present invention, the long afterglow films 300 correspond to the organic light emitting diodes 200 one to one, and the excited light emitting color of the long afterglow films 300 is the same as the light emitting color of the corresponding organic light emitting diode 200. For example, the light emitting color of the organic light emitting diode 200A and the light emitting color of the long-afterglow film 300A after being excited are red, the light emitting color of the organic light emitting diode 200B and the light emitting color of the long-afterglow film 300B after being excited are green, and the light emitting color of the organic light emitting diode 200C and the light emitting color of the long-afterglow film 300C after being excited are blue, so that the total light intensity of the long-afterglow film and the organic light emitting diode can be used as the light intensity of the sub-pixel, and the display of the sub-pixel is realized.
According to an embodiment of the present invention, the long persistence material in the long persistence film 300A corresponding to the red organic light emitting diode 200A may include SrTiO3:Pr3+And CaTiO3:Pr3+The long persistence material in the long persistence thin film 300B corresponding to the green organic light emitting diode 200B may include SrAl2O4:Eu2+,Dy3+And Ca2MgSi2O7The long afterglow material in the long afterglow thin film 300C corresponding to the blue organic light emitting diode 200C may include CaAl2O4:Eu2+,Nd3+And Sr4Al11O25:Eu2+,Dy3+At least one of (1). Therefore, after being excited by light, the long afterglow film can emit light with the same color as the corresponding organic light emitting diode, the voltage of the organic light emitting diode can be reduced under the condition of maintaining the preset brightness, the effect of saving energy consumption is achieved, and meanwhile the service life of the organic light emitting diode can be prolonged.
According to an embodiment of the present invention, referring to fig. 3, the organic electroluminescent display device may further include: a control switch 30, a gate line 40 and a data line 50, wherein the control switch 30 is connected to the plurality of voltage regulating elements 10, the gate line 40 is connected to the control switch 30, the gate line 40 is configured to control the opening and closing of the control switch 30, the data line 50 is connected to the control switch 30, and the data line 50 is configured to apply a voltage to the plurality of organic light emitting diodes 200. Therefore, the on-off of the control switch can be controlled through the grid line, the on-off of the organic light emitting diode is further controlled, and when the organic light emitting diode is switched on, voltage can be applied to the organic light emitting diode through the data line, so that the organic light emitting diode works.
According to an embodiment of the present invention, the circuit elements, such as the voltage adjusting element 10, the control switch 30, the gate line 40, and the data line 50, are disposed on the substrate to control the organic light emitting diode, and fig. 3 only shows the electrical connection relationship among the elements, and is not to be construed as limiting the positions of the elements.
According to an embodiment of the present invention, the control switch 30 may be a thin film transistor, the gate line 40 and the data line 50 are respectively connected to an external circuit, the external circuit applies a voltage to the gate line 40, and may control the control switch 30 to be turned on and off, when the control switch 30 is turned on, the external circuit applies a voltage to the data line 50, and the data line 50 transmits the voltage to the organic light emitting diode 200, so as to implement the operation of the organic light emitting diode.
For ease of understanding, the operation of the organic electroluminescent display device according to an embodiment of the present invention will be briefly described as follows:
according to an embodiment of the present invention, referring to fig. 3, an external circuit connected to the gate line 40 applies a voltage to the gate line 40, so that the control switch 30 is turned on, and an external circuit connected to the data line 50 applies a voltage to the data line 50 and transmits the voltages to the plurality of voltage adjusting elements 10, respectively, the voltage adjusting elements 10 adjust the voltage to a voltage required for the operation of the organic light emitting diode 200, so that the organic light emitting diode 200 emits light, the light emitted from the organic light emitting diode 200 excites the long afterglow film 300 corresponding thereto to emit light, the light intensity sensor 400 senses the total light intensity of the organic light emitting diode 200 and the long afterglow film 300 and converts the light intensity signal into a voltage signal, and transmits the voltage signal to the voltage adjusting elements 10, and the voltage adjusting elements 10 adjust the voltage applied to the organic light emitting diode 200.
Specifically, when the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 exceeds a preset value, the light intensity sensor 400 sends the sensed voltage signal to the voltage adjusting element 10, and the voltage adjusting element 10 decreases the voltage applied to the organic light emitting diode 200, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 is maintained at the preset value. After the voltage of the organic light emitting diode 200 is decreased, the light emitting intensity of the long-afterglow film 300 is also decreased, and the voltage regulating element 10, after receiving the voltage signal sensed by the light intensity sensor 400, increases the voltage applied to the organic light emitting diode 200, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow film 300 is maintained at the preset value. In the above working process, the voltage adjusting element 10 can adjust the voltage applied to the organic light emitting diode 200 in real time according to the voltage signal sensed by the light intensity sensor 400, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 is always maintained at the preset value.
According to the embodiment of the invention, the light intensity of the sub-pixel comprises the light emitting intensity of the organic light emitting diode and the light emitting intensity of the long afterglow film, so that the voltage of the organic light emitting diode can be reduced under the condition that the sub-pixel keeps the preset brightness, the purpose of saving energy consumption is achieved, meanwhile, the light intensity of the organic light emitting diode is reduced, the service life of the organic light emitting diode can be prolonged, even if the light intensity of the long afterglow film is weakened and the voltage of the organic light emitting diode is required to be increased, the voltage of the organic light emitting diode does not exceed the voltage required by the organic light emitting diode to emit light independently, therefore, the organic light emitting diode is not required to be in a higher excitation state all the time, the energy consumption can be saved.
According to the embodiment of the present invention, when the voltage of the organic light emitting diode 200 is decreased, the light intensity of the long-afterglow film 300 may decrease, when the voltage of the organic light emitting diode 200 is increased, the light intensity of the long-afterglow film 300 may increase, and there may be a delay in the decrease or increase of the light intensity of the long-afterglow film 300 after the voltage of the organic light emitting diode 200 is decreased, that is, after the voltage of the organic light emitting diode 200 is decreased, the light intensity of the long-afterglow film 300 may decrease with a certain delay time, and further, when the voltage of the organic light emitting diode 200 is decreased, the light intensity of the long-afterglow film 300 may still be maintained in a strong state, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow film 300 may be maintained at a preset value, and the organic electroluminescent display device may sense the light intensity sensor 400 in real time, and when the light intensity of the long-, the voltage of the organic light emitting diode 200 is reduced, and when the light intensity of the long afterglow film 300 is weakened, the voltage of the organic light emitting diode 200 is increased, so that the total light intensity of the organic light emitting diode 200 and the long afterglow film 300 is always maintained at a preset value, thereby achieving the effects of saving energy and prolonging the service life of the device, and enabling the organic electroluminescent display device to present high-quality full color display.
It should be noted that the "preset value" refers to a light intensity value when the sub-pixel displays a predetermined brightness, and the "voltage required for the operation of the organic light emitting diode" refers to a voltage required when the organic light emitting diode displays the predetermined brightness.
According to the embodiment of the present invention, the external circuit transmits the voltages to the red, green and blue oleds 200A, 200B and 200C through the data line 50, i.e., the sum of the voltages applied to the red, green and blue oleds 200A, 200B and 200C is the voltage transmitted to the data line 50 by the external circuit, and the voltage adjusting element 10 adjusts the voltages applied to the red, green and blue oleds 200A, 200B and 200C, respectively, without affecting each other and independently controlling each other.
According to the embodiment of the present invention, each organic light emitting diode 200 corresponds to one long persistence film 300, one light intensity sensor 400 and one voltage adjusting element 10, so that the red organic light emitting diode, the green organic light emitting diode and the blue organic light emitting diode can be independently controlled, and the color proportion of the three organic light emitting diodes can be controlled according to the actually required color degree, so as to realize true color.
For example, according to the embodiment of the present invention, when the total light intensity of the red organic light emitting diode and the corresponding long afterglow film exceeds a preset value, the voltage adjusting element connected to the red light element may be controlled to decrease the voltage applied to the red organic light emitting diode, and when the light intensity of the long afterglow film decreases, the voltage adjusting element connected to the red light element may be controlled to increase the voltage applied to the red organic light emitting diode. Similarly, when the total light intensity of the green organic light emitting diode and the corresponding long afterglow film exceeds the preset value, the voltage regulating element connected with the green element can be controlled to lower the voltage applied to the green organic light emitting diode, and when the light intensity of the long afterglow film is weakened, the voltage regulating element connected with the green element can be controlled to raise the voltage applied to the green organic light emitting diode. When the total light intensity of the blue light organic light emitting diode and the long afterglow thin film corresponding to the blue light organic light emitting diode exceeds a preset value, the voltage regulating element connected with the blue light element can be controlled to reduce the voltage applied to the blue light organic light emitting diode, and when the light intensity of the long afterglow thin film is weakened, the voltage regulating element connected with the blue light element can be controlled to increase the voltage applied to the blue light organic light emitting diode.
According to an embodiment of the present invention, referring to fig. 4, the organic electroluminescent display device may further include a transparent fuel thin film solar cell 600, and the transparent fuel thin film solar cell 600 is located on a side of the organic light emitting diode 200 away from the substrate 100 and connected to the plurality of light emitting element groups. On one hand, the solar cell can convert afterglow of the long afterglow film or natural light absorbed by the long afterglow film into electric energy to provide electric energy for the organic light emitting diode, so that the purpose of saving energy consumption is further achieved, and on the other hand, when components such as an external power supply and the like break down, the organic light emitting diode can be maintained to continuously work through the transparent fuel film solar cell, so that an emergency effect is achieved.
According to the embodiment of the invention, the transparent fuel thin-film solar cell 600 can be in a cover-type structure, so that the absorption of light emitted by the long afterglow thin film can be further improved, and the light is further converted into electric energy, and the effect of saving energy is further achieved.
The manner of electrically connecting the transparent fuel thin-film solar cell and the light-emitting element group is not particularly limited as long as emergency can be performed by using the solar cell after a failure occurs, and a person skilled in the art can design the solar cell according to actual conditions. For example, referring to fig. 5, the transparent fuel thin-film solar cell 600 may be connected to the data line 50, and after a failure occurs in a component such as an external power source, the transparent fuel thin-film solar cell 600 may serve as a standby power source to provide power for the light-emitting element group, so that the light-emitting element group can continue to operate after the failure occurs in the component such as the external power source, thereby playing an emergency role.
According to an embodiment of the present invention, referring to fig. 4, the organic electroluminescent display device may further include an electrochromic layer 500, the electrochromic layer 500 is disposed at a side of the transparent fuel thin film solar cell 600 near the organic light emitting diode 200, and the electrochromic layer 500 is configured to be switchable between a reflective state and a transparent state. When the organic light-emitting diode works, the electrochromic layer is in a reflection state, on one hand, the light emitted by the organic light-emitting diode can be completely used for displaying, the utilization rate of the light is improved, and on the other hand, the solar cell can be prevented from absorbing the light emitted by the organic light-emitting diode. When the organic light-emitting diode does not work, the electrochromic layer is in a transparent state, on one hand, the solar cell can absorb afterglow in the long afterglow film through the electrochromic layer and convert the afterglow into electric energy, on the other hand, the long afterglow film can absorb natural light, store energy and continuously emit light, and the solar cell absorbs the light emitted by the long afterglow film and converts the light into electric energy.
According to an embodiment of the present invention, the electrochromic layer 500 includes a reflective transition metal oxide, so that the electrochromic layer may have a reflective state and a transparent state, and the electrochromic layer 500 may maintain a stable state without additional power after completing the conversion. According to an embodiment of the present invention, the time for the electrochromic layer 500 to be switched between the reflective state and the transparent state may be 50-2000ms, and the switching voltage may be 0.25-3V. Therefore, the time for the electrochromic layer to switch between the reflective state and the transparent state is short, the voltage is low, and the effect of the electrochromic layer can be well realized.
According to an embodiment of the present invention, referring to fig. 4, the organic electroluminescent display device may further include an encapsulation film 700, and the encapsulation film 700 is disposed at a side of the transparent fuel thin film solar cell 600 away from the organic light emitting diode 200, whereby sealing of the solar cell, the electrochromic layer, the organic light emitting diode, and the like may be achieved.
In summary, the organic electroluminescent display device is provided with the long afterglow thin film, the organic light emitting diode can emit light to excite the long afterglow thin film to emit light, and the voltage of the organic light emitting diode can be reduced under the condition that the sub-pixel keeps the preset brightness, so that the energy consumption can be saved, meanwhile, the luminous intensity of the organic light emitting diode is reduced, and the service life of the organic light emitting diode can be prolonged. In addition, the organic electroluminescent display device is also provided with an electrochromic layer and a transparent fuel film solar cell, the solar cell can absorb the afterglow of the long afterglow film and the natural light absorbed by the long afterglow film and convert the light into electric energy, so that the energy consumption can be further saved, and when parts such as an external power supply and the like break down, the solar cell can be utilized to provide electric energy for the organic light-emitting diode, so that an emergency effect is achieved.
In another aspect of the present invention, a method of controlling an organic electroluminescent display device is provided. According to an embodiment of the present invention, the organic electroluminescent display device is the organic electroluminescent display device described above, the method including: the organic light emitting diode is made to emit light to excite the long afterglow film corresponding to the organic light emitting diode to emit light, the total light intensity signal of the organic light emitting diode and the long afterglow film is sensed by the light intensity sensor, and the voltage applied to the organic light emitting diode is determined to control the light emitting intensity of the organic light emitting diode, so that the total light intensity of the organic light emitting diode and the long afterglow film is maintained at a preset value. Therefore, on one hand, the organic electroluminescent display device can be always maintained at preset brightness, the problems of color difference and the like are avoided, the display quality is higher, on the other hand, the voltage of the organic light emitting diode can be reduced, the purpose of saving energy consumption is achieved, on the other hand, the light emitting intensity of the organic light emitting diode can be reduced, and the service life of the organic light emitting diode is prolonged.
According to an embodiment of the present invention, the organic electroluminescent display device further includes a control switch, a gate line, and a data line, and the connection relationship among the control switch, the gate line, and the data line has been described in detail above and is not described herein again.
According to the embodiment of the invention, the total light intensity of the organic light emitting diode and the long afterglow film is maintained at the preset value by the following processes:
referring to fig. 3, an external circuit connected to the gate line 40 applies a voltage to the gate line 40 to turn on the control switch 30, and an external circuit connected to the data line 50 applies a voltage to the data line 50 and transmits the voltage to the plurality of voltage adjusting elements 10, respectively, the voltage adjusting elements 10 adjust the voltage to a voltage required for the operation of the organic light emitting diode 200 to allow the organic light emitting diode 200 to emit light, the light emitted from the organic light emitting diode 200 excites the long-afterglow thin film 300 corresponding thereto to emit light, the light intensity sensor 400 senses the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 and converts the light intensity signal into a voltage signal to be transmitted to the voltage adjusting elements 10, and the voltage adjusting elements 10 adjust the voltage applied to the organic light emitting diode 200.
Specifically, when the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 exceeds a preset value, the light intensity sensor 400 sends the sensed voltage signal to the voltage adjusting element 10, and the voltage adjusting element 10 decreases the voltage applied to the organic light emitting diode 200, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 is maintained at the preset value. After the voltage of the organic light emitting diode 200 is decreased, the light emitting intensity of the long-afterglow film 300 is also decreased, and the voltage regulating element 10, after receiving the voltage signal sensed by the light intensity sensor 400, increases the voltage applied to the organic light emitting diode 200, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow film 300 is maintained at the preset value. In the above working process, the voltage adjusting element 10 can adjust the voltage applied to the organic light emitting diode 200 in real time according to the voltage signal sensed by the light intensity sensor 400, so that the total light intensity of the organic light emitting diode 200 and the long-afterglow thin film 300 is always maintained at the preset value.
According to the embodiment of the invention, the light intensity of the sub-pixel comprises the light emitting intensity of the organic light emitting diode and the light emitting intensity of the long afterglow film, so that the voltage of the organic light emitting diode can be reduced under the condition that the sub-pixel keeps the preset brightness, the purpose of saving energy consumption is achieved, meanwhile, the light intensity of the organic light emitting diode is reduced, the service life of the organic light emitting diode can be prolonged, even if the light intensity of the long afterglow film is weakened and the voltage of the organic light emitting diode is required to be increased, the voltage of the organic light emitting diode does not exceed the voltage required by the organic light emitting diode to emit light independently, therefore, the organic light emitting diode is not required to be in a higher excitation state all the time, the energy consumption can be saved.
According to the embodiment of the invention, when the voltage of the organic light emitting diode is reduced, the light intensity of the long-afterglow thin film is weakened, when the voltage of the organic light emitting diode is increased, the light intensity of the long-afterglow thin film is strengthened, and after the voltage of the organic light emitting diode is decreased or increased, the weakening or strengthening of the light intensity of the long-afterglow thin film is delayed, namely, after the voltage of the organic light emitting diode is decreased, the light intensity of the long-afterglow thin film is weakened after being delayed for a certain time, further, when the voltage of the organic light emitting diode is decreased, the light intensity of the long-afterglow thin film is still maintained in a stronger state, so that the total light intensity of the organic light emitting diode and the long-afterglow thin film is maintained at a preset value, and the organic electroluminescent display device can sense the light intensity in real time through the light intensity sensor, when the light intensity of the long-afterglow thin film is increased, the voltage of the organic, the voltage of the organic light-emitting diode is increased, so that the total light intensity of the organic light-emitting diode and the long afterglow film is always maintained at a preset value, the effects of saving energy and prolonging the service life of the device are achieved, and the organic electroluminescent display device presents high-quality full-color display.
In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. An organic electroluminescent display device, comprising:
a substrate, which is a transparent substrate;
the light-emitting device comprises a plurality of light-emitting element groups, a plurality of light-emitting element groups and a plurality of light-emitting element groups, wherein each light-emitting element group comprises an organic light-emitting diode, a long-afterglow thin film, a voltage regulating element and a light intensity sensor, the organic light-emitting diodes are arranged on a substrate, the light-emitting sides of the organic light-emitting diodes face the substrate, the long-afterglow thin film is arranged on one side, away from the organic light-emitting diodes, of the substrate, the light-emitting color of the long-afterglow thin film after being excited by the organic light-emitting diodes is the same as the light-emitting color of the organic light-emitting diodes, the organic light-emitting diodes are connected with the voltage regulating element, the light intensity sensors are;
the transparent fuel thin-film solar cell is positioned on one side of the organic light-emitting diode, which is far away from the substrate, and is electrically connected with the plurality of light-emitting element groups;
an electrochromic layer disposed on a side of the transparent fuel thin film solar cell proximate the organic light emitting diode, the electrochromic layer configured to be switchable between a reflective state and a transparent state.
2. The organic electroluminescent display device according to claim 1, wherein the long persistence thin film is composed of a transparent polymer doped with a long persistence material, the transparent polymer including at least one of polyester, polyether, and polyamide.
3. The organic electroluminescent display device according to claim 1, wherein the organic light emitting diode comprises a red organic light emitting diode, a green organic light emitting diode, or a blue organic light emitting diode.
4. The organic electroluminescent display device according to claim 3, wherein the long persistence material in the long persistence thin film corresponding to the red organic light emitting diode comprises SrTiO3:Pr3+And CaTiO3:Pr3+At least one of the above-mentioned (B),
the long afterglow material in the long afterglow thin film corresponding to the green light organic light emitting diode comprises SrAl2O4:Eu2+,Dy3+And Ca2MgSi2O7ToOne of the number of the components is less than the total number of the components,
the long afterglow material in the long afterglow film corresponding to the blue light organic light emitting diode comprises CaAl2O4:Eu2+,Nd3+And Sr4Al11O25:Eu2+,Dy3+At least one of (1).
5. The organic electroluminescent display device according to claim 1, characterized by further comprising:
a control switch connected to the plurality of voltage regulating elements;
a gate line connected to the control switch, the gate line configured to control the on/off of the control switch;
a data line connected to the control switch, the data line configured to apply a voltage to the plurality of organic light emitting diodes.
6. The organic electroluminescent display device according to claim 1, wherein the electrochromic layer is switched between the reflective state and the transparent state for a time of 50-2000ms and a switching voltage of 0.25-3V.
7. A method of controlling an organic electroluminescent display device, wherein the organic electroluminescent display device is the organic electroluminescent display device according to any one of claims 1 to 6, the method comprising:
and the organic light emitting diode is made to emit light to excite the long afterglow film corresponding to the organic light emitting diode to emit light, the total light intensity signals of the organic light emitting diode and the long afterglow film are induced by the light intensity sensor, and the voltage applied to the organic light emitting diode is determined to control the light emitting intensity of the organic light emitting diode so as to maintain the total light intensity of the organic light emitting diode and the long afterglow film at a preset value.
8. The method of claim 7, wherein maintaining the total light intensity of the organic light emitting diode and the long persistence film at a predetermined value comprises:
the light intensity sensor converts the induced light intensity signal into a voltage signal, transmits the voltage signal to the voltage adjusting element, and adjusts the voltage applied to the organic light emitting diode in real time by using the voltage adjusting element so as to maintain the total light intensity of the organic light emitting diode and the long afterglow film at the preset value.
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