CN107871473B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107871473B CN107871473B CN201711057774.8A CN201711057774A CN107871473B CN 107871473 B CN107871473 B CN 107871473B CN 201711057774 A CN201711057774 A CN 201711057774A CN 107871473 B CN107871473 B CN 107871473B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1255—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the invention discloses a display panel and a display device, wherein the display panel comprises a substrate base plate and a display unit, and the display unit comprises a first electrode and a second electrode; the voltage adjusting device is positioned on one side of the display unit and electrically connected with the second electrode, and the voltage adjusting device is not conducted when the potential of the second electrode meets a first preset voltage; when the potential of the second electrode is greater than the first preset voltage, the voltage regulating device is conducted and is used for reducing the potential of the second electrode; or when the potential of the second electrode accords with a second preset voltage, the voltage regulating device is not conducted; and when the potential of the second electrode is less than the second preset voltage, the voltage regulating device is switched on and is used for increasing the potential of the second electrode. According to the technical scheme, the voltage adjusting device is electrically connected with the second electrode, when the potential of the second electrode is abnormal, the potential of the second electrode is adjusted through the voltage adjusting device, the potential of the second electrode is enabled to be recovered to be normal, and the display panel is enabled to work normally.
Description
Technical Field
The embodiment of the invention relates to the technical field of semiconductors, in particular to a display panel and a display device.
Background
With the development of science and technology, the display device with the display panel has more and more extensive applications, and in the prior art, the commonly used display panel includes an organic light emitting diode display panel and a liquid crystal display panel.
When the display panel displays normally, voltage signals with proper electric potentials are respectively input to the two electrodes on the display panel, so that the display panel can display normally. However, when the light emitting current in the display panel is abnormal or the driving IC providing the voltage signal is abnormal, the voltage signal inputted to the electrode of the display panel is abnormal, and the display panel cannot perform normal display, thereby affecting the display effect of the display panel.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a display panel and a display device to solve the technical problem in the prior art that when a potential of an electrode in the display panel changes abnormally, the display panel cannot display normally.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate base plate;
the display unit is positioned on one side of the substrate base plate and comprises a first electrode and a second electrode;
the voltage adjusting device is positioned on one side of the display unit and electrically connected with the second electrode, and the voltage adjusting device is not conducted when the potential of the second electrode meets a first preset voltage; when the potential of the second electrode is greater than the first preset voltage, the voltage regulating device is switched on to reduce the potential of the second electrode;
or when the potential of the second electrode accords with a second preset voltage, the voltage regulating device is not conducted; and when the potential of the second electrode is less than the second preset voltage, the voltage regulating device is switched on and is used for increasing the potential of the second electrode.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel described in the first aspect
According to the display panel and the display device provided by the embodiment of the invention, the display panel comprises the substrate base plate and the display unit positioned on one side of the substrate base plate, the display unit comprises the first electrode and the second electrode, the voltage adjusting device is arranged on one side of the display unit and is connected with the second electrode, when the potential of the second electrode is abnormal, the voltage adjusting device is conducted, the potential on the second electrode is adjusted through the voltage adjusting device, the potential on the second electrode is ensured to be recovered to be normal, the display unit can be ensured to display normally, and the whole display panel can work normally.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the display panel shown in FIG. 1 along the sectional line A-A';
FIG. 3 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be fully described by the detailed description with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without inventive efforts fall within the scope of the present invention.
The embodiment of the invention provides a display panel, which comprises a substrate base plate; the display unit is positioned on one side of the substrate base plate and comprises a first electrode and a second electrode; the voltage adjusting device is positioned on one side of the display unit and electrically connected with the second electrode, and the voltage adjusting device is not conducted when the potential of the second electrode meets a first preset voltage; when the potential of the second electrode is greater than the first preset voltage, the voltage regulating device is switched on to reduce the potential of the second electrode; or when the potential of the second electrode accords with a second preset voltage, the voltage regulating device is not conducted; and when the potential of the second electrode is less than the second preset voltage, the voltage regulating device is switched on and is used for increasing the potential of the second electrode. And a voltage regulating device is arranged to be electrically connected with the second electrode, when the potential of the second electrode is abnormal, the voltage regulating device is switched on, the potential on the second electrode is regulated through the voltage regulating device, the potential on the second electrode is ensured to be recovered to be normal, the display unit is ensured to normally display, and the display panel normally works.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic top view structure diagram of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional structure diagram of the display panel shown in fig. 1 along a sectional line a-a', as shown in fig. 1 and fig. 2, the display panel according to an embodiment of the present invention may include a substrate 10, a display unit 20 located on one side of the substrate 10, and the display unit 20 may include a first electrode 21 and a second electrode 22;
a voltage adjusting device 30 positioned at one side of the display unit 20, the voltage adjusting device 30 being electrically connected to the second electrode 22; when the potential of the second electrode 22 meets the first preset voltage, the voltage regulating device 30 is not conducted; when the potential of the second electrode 22 is greater than the preset first voltage, the voltage adjusting device 30 is turned on to reduce the potential of the second electrode 22;
or, when the electric potential of the second electrode 22 conforms to the second preset voltage, the voltage regulating device 30 is not turned on; when the potential of the second electrode 22 is less than the second preset voltage, the voltage regulating device 30 is turned on for increasing the potential of the second electrode 22.
As shown in fig. 1, the embodiment of the present invention is exemplified by arranging a plurality of first electrodes 21 in an array, and taking the second electrode 22 as a whole surface electrode. The voltage regulating device 30 may be located on a side of the film layer where the display unit 20 is located near the substrate base plate 10, as shown in fig. 2; or may be located on a side (not shown in the drawings) of the film layer where the display unit 20 is located away from the substrate base plate 10, the embodiment of the present invention does not limit the upper and lower positional relationship between the film layer where the display unit 20 is located and the film layer where the voltage regulating device 30 is located, and fig. 2 only illustrates an example where the voltage regulating device 30 is located on a side of the film layer where the display unit 20 is located close to the substrate base plate 10.
A first electrode potential signal is applied to the first electrode 21, a second electrode potential signal is applied to the second electrode 22, and the first electrode 21 and the second electrode 22 display according to a normal potential signal. When the electric potential of the second electrode 22 conforms to the first preset voltage, for example, the normal electric potential of the second electrode 22 may be zero electric potential or a certain value of negative electric potential, the first preset voltage may be a voltage less than or equal to zero, and at this time, the electric potential of the second electrode 22 conforms to the first preset voltage, and the voltage regulating device is not turned on. When the light emitting current of the display unit 20 or a driving IC (not shown in the figure) providing a potential signal is abnormal, the potential signal connected to the second electrode 22 becomes suddenly large, when the potential of the second electrode 22 is greater than a first preset voltage, the potential of the second electrode 22 belongs to an abnormal potential, the voltage adjusting device 30 electrically connected to the second electrode 22 is turned on, and the voltage adjusting device 30 may be configured to reduce the potential value of the second electrode 22 to return to the first preset voltage range, so as to ensure that the potential of the second electrode 22 is normal.
Alternatively, when the potential of the second electrode 22 conforms to a second preset voltage, for example, the normal potential of the second electrode 22 may be zero potential or a certain value of negative potential, the second preset voltage may be a voltage less than or equal to zero and greater than or equal to a certain value (for example, -12V), and at this time, the potential of the second electrode 22 conforms to the second preset potential, and the voltage regulating device 30 is not turned on; when the light emitting current of the display unit 20 or a driving IC (not shown in the figure) providing a potential signal is abnormal, the potential signal connected to the second electrode 22 is suddenly decreased, when the potential of the second electrode 22 is smaller than a second preset voltage, the potential of the second electrode 22 belongs to the abnormal potential, the voltage adjusting device 30 electrically connected to the second electrode 22 is turned on, and the voltage adjusting device 30 may be configured to increase the potential value of the second electrode 22 to be within a second preset voltage range, so as to ensure that the potential of the second electrode 22 is normal.
In summary, in the embodiments of the present invention, by adding the voltage adjustment device electrically connected to the second electrode, when the potential of the second electrode is abnormal, the potential of the second electrode is reduced or increased by turning on the voltage adjustment device, so that the potential of the second electrode is restored to the normal potential range, thereby ensuring that the display unit displays normally and the display panel operates normally.
Optionally, the voltage adjusting device 30 may be a diode, a triode, or other devices capable of performing voltage adjustment, which is not limited in the embodiment of the present invention, and is described by taking a diode as an example.
With continued reference to fig. 2, the voltage regulating device 30 may be a rectifying diode that may include a first anode 31, a first cathode 32, and a first semiconductor layer 33; the first anode 31 is electrically connected to the second electrode 22 in the display unit 20; a third predetermined voltage is applied to the first cathode 32. Specifically, when the potential of the second electrode 22 meets the first preset voltage, the difference between the first preset voltage and the third preset voltage is smaller than the threshold voltage of the rectifier diode, and the rectifier diode is not conducted; when the potential of the second electrode 22 is greater than the first preset voltage and rises to a fourth preset voltage, a difference value between the fourth preset voltage and the third preset voltage is greater than a threshold voltage of the rectifier diode, and the rectifier diode is turned on and used for reducing the potential of the second electrode to a fifth preset voltage; and the difference value between the fifth preset voltage and the third preset voltage is smaller than the threshold voltage of the rectifier diode, and the rectifier diode is not conducted.
Optionally, the rectifying diode may be a common silicon diode or a germanium diode, and in the embodiment of the present invention, a silicon diode is taken as an example for description, and a threshold voltage of the silicon diode is about 0.7V. When the potential of the second electrode 22 meets the first predetermined voltage, for example, the first predetermined voltage is 0V, the third predetermined voltage may be a fixed voltage, for example, -0.4V, and the difference between the first predetermined voltage and the third predetermined voltage is 0.4V. Since the second electrode 22 is electrically connected to the first anode 31 of the rectifier diode, at this time, the voltage applied to the first anode 31 of the rectifier diode is 0V, the voltage applied to the first cathode 32 of the rectifier diode is-0.4V, the voltage difference between the first anode 31 and the first cathode 32 of the rectifier diode is 0.4V, which is smaller than the threshold voltage of the rectifier diode, and the rectifier diode is not conductive. When the potential on the second electrode 22 abnormally rises to a fourth preset voltage, for example, 1V, at this time, the voltage applied to the first anode 31 of the rectifying diode is 1V, the voltage applied to the first cathode 32 of the rectifying diode is-0.4V, the voltage difference between the first anode 31 and the first cathode 32 of the rectifying diode is 1.4V, which is greater than the threshold voltage of the rectifying diode, and the rectifying diode is turned on. When the rectifying diode is turned on, the rectifying diode may pull down the potential of the second electrode 22 to a fifth preset voltage, where the fifth preset voltage is smaller than the fourth preset voltage, and a difference between the fifth preset voltage and the third preset voltage is smaller than a threshold voltage of the rectifying diode, at this time, the rectifying diode is not turned on, and the voltage on the second electrode 22 maintains the fifth preset voltage. When the potential on the second electrode 22 abnormally rises again, the rectifier diode is turned on again to decrease the voltage on the second electrode 22.
Optionally, the fifth preset voltage may be equal to the first preset voltage, or due to an influence caused by a temperature change or other external factors during the operation of the rectifier diode, the fifth preset voltage may be slightly greater than the first preset voltage, for example, when the first preset voltage is 0V, the fifth preset voltage may be 0.1V. However, the difference between the fifth preset voltage and the third preset voltage must be smaller than the threshold voltage of the rectifier diode, which is not conductive.
To sum up, according to the technical solution of the embodiment of the present invention, the first anode of the rectifier diode is electrically connected to the second electrode in the display unit, and the voltage value of the first cathode of the rectifier diode is reasonably set, so that the rectifier diode is not conducted when the potential of the second electrode is normal, when the potential of the second electrode abnormally rises, the rectifier diode is conducted to pull down the potential of the second electrode to a normal potential, the display unit is protected by the rectifier diode, so that the display unit can normally display, and the whole display panel can normally work.
Alternatively, with continued reference to fig. 2, the first anode 31 and the first cathode 32 may be disposed in the same layer and on the side of the first semiconductor layer 33 away from the substrate base plate 10; the first semiconductor layer 33 may include an N-type first semiconductor layer 331 and a P-type first semiconductor layer 332, wherein there is an overlapping region between a vertical projection of the first anode 31 on the substrate base plate 10 and a vertical projection of the P-type first semiconductor layer 332 on the substrate base plate 10; an overlapping region exists between the vertical projection of the first cathode 32 on the substrate base plate 10 and the vertical projection of the N-type first semiconductor layer 331 on the substrate base plate 10. Exemplarily, the first anode 31 is disposed on one side of the first semiconductor layer 33 away from the substrate base plate 10 and close to one side of the second electrode 22, so as to ensure that there are few film layers between the second electrode 22 and the first anode 31, and the preparation process is simple when the second electrode 22 and the first anode 31 are connected; the first anode 31 and the first cathode 32 are arranged on the same layer, and the rectifier diode film layer can be simply arranged; and the first anode 31 and the first cathode 32 are synchronously prepared, and the preparation process is simple. The first semiconductor layer 33 is arranged to include an N-type first semiconductor layer 331 and a P-type first semiconductor layer 332, the N-type first semiconductor layer 331 and the P-type first semiconductor layer 332 can be obtained by doping ions of different types in the same semiconductor layer, the N-type first semiconductor layer 331 and the P-type first semiconductor layer 332 are simple in preparation process, and film arrangement of the rectifier diode is reduced.
Optionally, with continued reference to fig. 2, the display panel provided in the embodiment of the present invention may further include a driving circuit layer, where the driving circuit layer may include a thin film transistor 40; the first semiconductor layer 33 in the rectifying diode may be disposed in the same layer as the active layer 41 in the thin film transistor 40; the first anode 31 and the first cathode 32 in the rectifying diode may be disposed in the same layer as the gate electrode layer 42 or the source/drain electrode layer 43 in the thin film transistor 40, and fig. 2 illustrates an example in which the first anode 31 and the first cathode 32 are disposed in the same layer as the source/drain electrode layer 43. It can be understood that the first semiconductor layer 33 and the active layer 41 of the thin film transistor are disposed in the same layer, and the first anode 31 and the first cathode 32 are disposed in the same layer as the gate electrode layer 42 or the source/drain electrode layer 43 of the thin film transistor 40, which ensures to simplify the manufacturing process of the display panel and improve the manufacturing efficiency of the display panel.
Fig. 3 is a schematic cross-sectional structure of another display panel according to an embodiment of the present invention, and as shown in fig. 3, the rectifying diode may include a first cathode 32, a first semiconductor layer 33 and a first anode 31 sequentially stacked on the substrate 10, the first semiconductor layer 33 may include an N-type first semiconductor layer 331 and a P-type first semiconductor layer 332, where a vertical projection of the first anode 31 on the substrate and a vertical projection of the P-type first semiconductor layer 332 on the substrate 10 have an overlapping region; an overlapping region exists between the vertical projection of the first cathode 32 on the substrate base plate 10 and the vertical projection of the N-type first semiconductor layer 331 on the substrate base plate 10. Optionally, the first anode 31 is sequentially stacked on the first cathode 32 and the first semiconductor layer 33, and is close to one side of the second electrode 22, so that a small number of films are ensured between the second electrode 22 and the first anode 31, and the preparation process is simple when the second electrode 22 and the first anode 31 are connected. Optionally, the display panel may further include a driving circuit layer, the driving circuit layer may include a thin film transistor 40, the first semiconductor layer 33 may be disposed on the same layer as the active layer 41 of the thin film transistor 40, the first anode 31 may be disposed on the same layer as the source/drain electrode layer 43 of the thin film transistor 40, and the first cathode 32 may be disposed on the same layer as the gate electrode 42 of the thin film transistor 40, so that the display panel manufacturing process may be simplified, and the display panel manufacturing efficiency may be improved.
With continued reference to fig. 1, 2, and 3, the display panel may include a display region 11 and a non-display region 12 surrounding the display region 11, the rectifying diode may be located in the non-display region 12, and the second electrode 22 may extend to the non-display region 12 to be electrically connected to the first anode 31 of the rectifying diode. Optionally, the rectifier diode is disposed in the non-display area 12 of the display panel, so that it is ensured that the rectifier diode does not affect the opening area of the display panel and does not affect the display of the display panel. It can be understood that, because there are other film layers between the first anode 31 and the second electrode 22 of the rectifying diode, when the display panel is manufactured, only an opening needs to be left on the other film layers between the first anode 31 and the second electrode 22 of the rectifying diode and in the area corresponding to the first anode 31 of the rectifying diode, and when the second electrode 22 is manufactured, the second electrode 222 naturally fills the opening and is electrically connected to the first anode 31 of the rectifying diode through the opening.
Fig. 4 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 4, the voltage regulator device 30 may be a zener diode, and the zener diode may operate in a unidirectional conducting state or a reverse breakdown state. Alternatively, the zener diode may include a second anode 34, a second cathode 35, and a second semiconductor layer 36; the second anode 34 is electrically connected to the second electrode 22 in the display unit 20; a sixth predetermined voltage is applied to the second cathode 35. Specifically, when the potential of the second electrode 22 meets the first preset voltage, the difference between the first preset voltage and the sixth preset voltage is smaller than the threshold voltage of the zener diode, and the zener diode is not conducted; when the potential of the second electrode 22 is greater than the first preset voltage and rises to a seventh preset voltage, the difference between the seventh preset voltage and the sixth preset voltage is greater than the threshold voltage of the zener diode, and the zener diode is turned on to reduce the potential of the second electrode to an eighth preset voltage; the difference value between the eighth preset voltage and the sixth preset voltage is smaller than the threshold voltage of the voltage stabilizing diode, and the voltage stabilizing diode is not conducted;
or when the potential of the second electrode 22 meets the second preset voltage, the difference between the sixth preset voltage and the second preset voltage is smaller than the reverse breakdown voltage of the zener diode, and the zener diode is not broken down;
when the potential of the second electrode 22 is lower than the second preset voltage and drops to a ninth preset voltage, the difference between the sixth preset voltage and the ninth preset voltage is larger than the reverse breakdown voltage of the zener diode, the zener diode is in reverse breakdown, and the potential of the second electrode 22 is increased to a tenth preset voltage after the zener diode is in reverse recovery; and the difference value between the sixth preset voltage and the tenth preset voltage is smaller than the reverse breakdown voltage of the voltage stabilizing diode, and the voltage stabilizing diode is not broken down.
Optionally, when the device works in the unidirectional conduction state and silicon is selected as a preparation material of the zener diode, the threshold voltage of the zener diode is about 0.7V. When the potential of the second electrode 22 meets the first preset voltage, for example, the first preset voltage is 0V, the sixth preset voltage may be a fixed voltage, for example, -0.4V, and the difference between the first preset voltage and the sixth preset voltage is 0.4V. Since the second electrode 22 is electrically connected to the second anode 33 of the zener diode, at this time, the voltage applied to the second anode 34 of the zener diode is 0V, the voltage applied to the second cathode 35 of the zener diode is-0.4V, the voltage difference between the second anode 34 and the second cathode 35 of the zener diode is 0.4V, which is smaller than the threshold voltage of the zener diode, and the zener diode is not conducted. When the potential on the second electrode 22 abnormally rises to a seventh preset voltage, for example, 1V, at this time, the voltage applied to the second anode 34 of the zener diode is 1V, the voltage applied to the second cathode 35 of the zener diode is-0.4V, the voltage difference between the second anode 34 and the second cathode 35 of the zener diode is 1.4V, which is greater than the threshold voltage of the zener diode, and the zener diode is turned on. When the zener diode is turned on, the zener diode may pull down the potential of the second electrode 22 to an eighth preset voltage, where the eighth preset voltage is smaller than the seventh preset voltage, and a difference between the eighth preset voltage and the sixth preset voltage is smaller than a threshold voltage of the zener diode, at this time, the zener diode is not turned on, and the voltage on the second electrode 22 maintains the eighth preset voltage. When the potential on the second electrode 22 abnormally rises again, the zener diode is turned on again to decrease the voltage on the second electrode 22.
Optionally, the eighth preset voltage may be equal to the first preset voltage, or due to an influence caused by a temperature change or other external factors during the operation of the zener diode, the eighth preset voltage may be slightly greater than the first preset voltage, for example, when the first preset voltage is 0V, the eighth preset voltage may be 0.1V. However, the difference between the eighth preset voltage and the sixth preset voltage is definitely smaller than the threshold voltage when the zener diode is in one-way conduction, and the zener diode is not in conduction.
Alternatively, when the zener diode operates in the reverse breakdown state, the reverse breakdown electrode of the zener diode for a particular signal is assumed to be 7V. When the potential at the second electrode 22 meets the second predetermined voltage, for example, the second predetermined voltage is-6V, the sixth predetermined voltage may be a fixed voltage, for example, -0.4V, and the difference between the sixth predetermined voltage and the second predetermined voltage is 5.6V. Since the second electrode 22 is electrically connected to the second anode 33 of the zener diode, at this time, the voltage applied to the second anode 34 of the zener diode is-6V, the voltage applied to the second cathode 35 of the zener diode is-0.4V, and the voltage difference between the second cathode 35 of the zener diode and the second anode 34 is 5.6V, which is smaller than the reverse breakdown voltage of the zener diode, so that the zener diode does not break down in the reverse direction. When the potential on the second electrode 22 abnormally decreases to a ninth predetermined voltage, for example, -10V, at this time, the voltage applied to the second anode 34 of the zener diode is-10V, the voltage applied to the second cathode 35 of the zener diode is-0.4V, the voltage difference between the second cathode 35 and the second anode 34 of the zener diode is 9.6V, which is greater than the reverse breakdown voltage of the zener diode, and the zener diode is reversely broken down. When the zener diode is reversely broken down, the potential of the second electrode 22 is stably increased to the tenth preset voltage after the zener diode is reversely recovered, the tenth preset voltage is greater than the ninth preset voltage, and the difference between the sixth preset voltage and the tenth preset voltage is smaller than the reverse breakdown voltage of the zener diode, at this time, the zener diode is not reversely broken down, and the voltage on the second electrode 22 maintains the tenth preset voltage. When the potential on the second electrode 22 abnormally drops again, the zener diode again breaks down in the reverse direction-recovers in the reverse direction to increase the voltage on the second electrode 22.
Optionally, the tenth preset voltage may be equal to the second preset voltage, or due to an influence caused by a temperature change or other external factors during the operation of the zener diode, the tenth preset voltage may be slightly smaller than the second preset voltage, for example, when the second preset voltage is-6V, the tenth preset voltage may be-6.1V. However, the difference between the sixth preset voltage and the tenth preset voltage is definitely smaller than the threshold voltage of the reverse breakdown of the zener diode, and the zener diode does not breakdown in the reverse direction.
To sum up, according to the technical scheme of the embodiment of the present invention, the second anode of the zener diode is electrically connected to the second electrode in the display unit, and the voltage value of the second cathode of the zener diode is reasonably set, so that when the potential of the second electrode is normal, the zener diode is unidirectional and non-conductive, and when the potential of the second electrode abnormally rises, the zener diode is conductive to pull down the potential of the second electrode to the normal potential; or when the potential on the second electrode is ensured to be normal, the voltage stabilizing diode does not break down in the reverse direction, and when the potential on the second electrode is abnormally reduced, the voltage stabilizing diode recovers in the reverse direction and then raises the potential on the second electrode to the normal potential. The voltage stabilizing diode protects the display unit, so that the display unit can normally display, and the whole display panel can normally work.
Alternatively, with continued reference to fig. 4, the second anode 34 and the second cathode 35 may be disposed in the same layer and on the side of the second semiconductor layer 36 away from the base substrate 10; the second semiconductor layer 36 may include an N-type second semiconductor layer 361 and a P-type second semiconductor layer 362, wherein there is an overlap region between a vertical projection of the second anode 34 on the substrate base plate 10 and a vertical projection of the P-type second semiconductor layer 362 on the substrate base plate 10; an overlapping region exists between the vertical projection of the second cathode 35 on the substrate base plate 10 and the vertical projection of the N-type first semiconductor layer 361 on the substrate base plate 10. For example, the second anode 34 is disposed on a side of the second semiconductor layer 36 away from the substrate base plate 10 and close to a side of the second electrode 22, so that a few film layers are ensured between the second electrode 22 and the second anode 34, and a preparation process is simple when the second electrode 22 and the second anode 34 are connected; the second anode 34 and the second cathode 35 are arranged on the same layer, and the film layer of the voltage stabilizing diode can be simply arranged; and the second anode 34 and the second cathode 35 are synchronously prepared, and the preparation process is simple. The second semiconductor layer 36 includes an N-type second semiconductor layer 361 and a P-type second semiconductor layer 362, the N-type second semiconductor layer 361 and the P-type second semiconductor layer 362 can be obtained by doping ions of different types in the same semiconductor layer, the preparation process of the N-type second semiconductor layer 361 and the P-type second semiconductor layer 362 is simple, and meanwhile, the film arrangement of the zener diode is reduced.
Optionally, with continued reference to fig. 4, the display panel provided in the embodiment of the present invention may further include a driving circuit layer, where the driving circuit layer may include a thin film transistor 40; the second semiconductor layer 36 in the zener diode may be disposed in the same layer as the active layer 41 in the thin film transistor 40; the second anode 34 and the second cathode 35 in the zener diode may be disposed in the same layer as the gate electrode layer 42 or the source/drain electrode layer 43 in the thin film transistor 40, and fig. 4 illustrates an example in which the second anode 34 and the second cathode 35 are disposed in the same layer as the source/drain electrode layer 43. It can be understood that the second semiconductor layer 36 and the active layer 41 of the thin film transistor are disposed in the same layer, and the second anode 34 and the second cathode 35 are disposed in the same layer as the gate electrode layer 42 or the source/drain electrode layer 43 of the thin film transistor 40, which ensures to simplify the manufacturing process of the display panel and improve the manufacturing efficiency of the display panel.
Fig. 5 is a schematic cross-sectional structure of another display panel according to an embodiment of the present invention, and as shown in fig. 5, the zener diode may include a second cathode 35, a second semiconductor layer 36 and a second anode 34 sequentially stacked on the substrate 10, where the second semiconductor layer 36 may include an N-type second semiconductor layer 361 and a P-type second semiconductor layer 362, where a vertical projection of the second anode 34 on the substrate 10 and a vertical projection of the P-type second semiconductor layer 362 on the substrate 10 have an overlapping region; there is an overlap region between the vertical projection of the second cathode 35 on the base substrate 10 and the vertical projection of the N-type second semiconductor layer 361 on the base substrate 10. Optionally, the second anode 34 is sequentially stacked on the second cathode 35 and the second semiconductor layer 36, and is close to one side of the second electrode 22, so that a small number of films are ensured between the second electrode 22 and the second anode 34, and the preparation process is simple when the second electrode 22 and the second anode 34 are connected. Optionally, the display panel may further include a driving circuit layer, the driving circuit layer may include a thin film transistor 40, the second semiconductor layer 36 may be disposed on the same layer as the active layer 41 of the thin film transistor 40, the second anode 34 may be disposed on the same layer as the source/drain electrode layer 43 of the thin film transistor 40, and the second cathode 35 may be disposed on the same layer as the gate electrode 42 of the thin film transistor 40, so that the display panel manufacturing process may be simplified, and the display panel manufacturing efficiency may be improved.
Alternatively, the second semiconductor layer 36 in the zener diode may be a silicon semiconductor layer.
Alternatively, as shown with continued reference to fig. 1, 4 and 5, the display panel may include a display region 11 and a non-display region 12 surrounding the display region 11, the zener diode may be located in the non-display region 12, and the second electrode 22 may extend to the non-display region 12 to be electrically connected to the second anode 34 of the zener diode. Optionally, the zener diode is disposed in the non-display region 12 of the display panel, so as to ensure that the zener diode does not affect the opening region of the display panel and does not affect the display of the display panel. It can be understood that, because there are other film layers between the second anode 34 and the second electrode 22 of the zener diode, when the display panel is manufactured, only an opening needs to be left in the other film layers between the second anode 34 and the second electrode 22 of the zener diode and corresponding to the second anode 34 of the zener diode, and when the second electrode 22 is manufactured, the second electrode 222 naturally fills the opening and is electrically connected to the second anode 34 of the zener diode through the opening.
Optionally, the display panel provided in the embodiment of the present invention may be an organic light emitting display panel, and may also be a liquid crystal display panel. When the display panel is an organic light emitting display panel, the first electrode 21 may be an anode electrode in the organic light emitting display panel, and the second electrode 22 may be a cathode electrode in the organic light emitting display panel; when the display panel is a liquid crystal display panel, the first electrode 21 may be a pixel electrode in the liquid crystal display panel, and the second electrode 22 may be a common electrode in the liquid crystal display panel. The embodiment of the present invention does not limit the type of the display panel.
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 6, the display device 100 may include the display panel 101 according to any embodiment of the present invention. The display device 100 may be a mobile phone as shown in fig. 6, or may be a computer, a television, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A display panel, comprising:
a substrate base plate;
the display unit is positioned on one side of the substrate base plate and comprises a first electrode and a second electrode;
the voltage adjusting device is positioned on one side of the display unit and electrically connected with the second electrode, and the voltage adjusting device is not conducted when the potential of the second electrode meets a first preset voltage; when the potential of the second electrode is greater than the first preset voltage, the voltage regulating device is switched on to reduce the potential of the second electrode;
or when the potential of the second electrode accords with a second preset voltage, the voltage regulating device is not conducted; when the potential of the second electrode is less than the second preset voltage, the voltage regulating device is switched on to increase the potential of the second electrode;
the display panel is an organic light-emitting display panel, the display unit is an organic light-emitting display unit, the first electrode is an anode electrode of the organic light-emitting display unit, and the second electrode is a cathode electrode of the organic light-emitting display unit.
2. The display panel according to claim 1, wherein the voltage adjusting device is a rectifying diode including a first anode, a first cathode, and a first semiconductor layer; the first anode is electrically connected with the second electrode; a third preset voltage is applied to the first cathode;
when the potential of the second electrode accords with a first preset voltage, the difference value between the first preset voltage and the third preset voltage is smaller than the threshold voltage of the rectifier diode, and the rectifier diode is not conducted;
when the potential of the second electrode is greater than the first preset voltage and rises to a fourth preset voltage, the difference value between the fourth preset voltage and the third preset voltage is greater than the threshold voltage of the rectifier diode, and the rectifier diode is conducted and used for reducing the potential of the second electrode to a fifth preset voltage; and the difference value between the fifth preset voltage and the third preset voltage is smaller than the threshold voltage of the rectifier diode, and the rectifier diode is not conducted.
3. The display panel according to claim 1, wherein the voltage adjusting device is a zener diode including a second anode, a second cathode, and a second semiconductor layer; the second anode is electrically connected with the second electrode; a sixth preset voltage is applied to the second cathode;
when the potential of the second electrode accords with a first preset voltage, the difference value between the first preset voltage and the sixth preset voltage is smaller than the threshold voltage of the voltage stabilizing diode, and the voltage stabilizing diode is not conducted;
when the potential of the second electrode is greater than the first preset voltage to a seventh preset voltage, the difference value between the seventh preset voltage and the sixth preset voltage is greater than the threshold voltage of the zener diode, and the zener diode is turned on and used for reducing the potential of the second electrode to an eighth preset voltage; the difference value between the eighth preset voltage and the sixth preset voltage is smaller than the threshold voltage of the voltage stabilizing diode, and the voltage stabilizing diode is not conducted;
or when the potential of the second electrode meets a second preset voltage, the difference value between the sixth preset voltage and the second preset voltage is smaller than the reverse breakdown voltage of the voltage stabilizing diode, and the voltage stabilizing diode is not broken down;
when the potential of the second electrode is lower than the second preset voltage and is reduced to a ninth preset voltage, the difference value between the sixth preset voltage and the ninth preset voltage is larger than the reverse breakdown voltage of the voltage regulator diode, the voltage regulator diode is in reverse breakdown, and the potential of the second electrode is increased to a tenth preset voltage after the voltage regulator diode is in reverse recovery; and the difference value between the sixth preset voltage and the tenth preset voltage is smaller than the reverse breakdown voltage of the voltage stabilizing diode, and the voltage stabilizing diode is not broken down.
4. The display panel according to claim 2, wherein the first anode and the first cathode are disposed on the same layer and located on a side of the first semiconductor layer away from the substrate base plate; the first semiconductor layer comprises an N-type first semiconductor layer and a P-type first semiconductor layer;
an overlapping area exists between the vertical projection of the first anode on the substrate base plate and the vertical projection of the P-type first semiconductor layer on the substrate base plate; an overlapping area exists between the vertical projection of the first cathode and the substrate base plate and the vertical projection of the N-type first semiconductor layer on the substrate base plate.
5. The display panel according to claim 4, wherein the display panel further comprises a driver circuit layer including a thin film transistor;
the first semiconductor layer and the active layer of the thin film transistor are arranged on the same layer;
the first anode and the first cathode are arranged on the same layer with a grid electrode layer or a source drain electrode layer of the thin film transistor.
6. The display panel according to claim 2, wherein the rectifying diode comprises a first cathode, a first semiconductor layer, and a first anode which are stacked in this order.
7. The display panel according to claim 6, wherein the display panel further comprises a driver circuit layer including a thin film transistor;
the first semiconductor layer and the active layer of the thin film transistor are arranged on the same layer;
the first anode and the source drain electrode layer of the thin film transistor are arranged on the same layer;
the first cathode and the thin film transistor gate electrode layer are arranged on the same layer.
8. The display panel according to claim 2, wherein the display panel includes a display area and a non-display area surrounding the display area;
the rectifier diode is positioned in the non-display area;
the second electrode extends to the non-display region and is electrically connected to the first anode of the rectifying diode.
9. The display panel according to claim 3, wherein the second anode and the second cathode are disposed on the same layer and located on a side of the second semiconductor layer away from the substrate; the second semiconductor layer comprises an N-type second semiconductor layer and a P-type second semiconductor layer;
an overlapping region exists between the vertical projection of the second anode on the substrate base plate and the vertical projection of the P-type second semiconductor layer on the substrate base plate; and an overlapping region exists between the vertical projection of the second cathode and the substrate base plate and the vertical projection of the N-type second semiconductor layer on the substrate base plate.
10. The display panel according to claim 9, wherein the display panel further comprises a driver circuit layer including a thin film transistor;
the second semiconductor layer and the active layer of the thin film transistor are arranged on the same layer;
the second anode and the second cathode are arranged on the same layer with the gate electrode layer or the source/drain electrode layer of the thin film transistor.
11. The display panel according to claim 3, wherein the second semiconductor layer is a silicon semiconductor layer.
12. The display panel according to claim 3, wherein the display panel includes a display area and a non-display area surrounding the display area;
the voltage stabilizing diode is positioned in the non-display area;
the second electrode extends to the non-display area and is electrically connected with the second anode of the voltage stabilizing diode.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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| CN105301814A (en) * | 2015-11-26 | 2016-02-03 | 深圳市华星光电技术有限公司 | Power supply circuit with detection function and display panel |
| CN107037656A (en) * | 2017-05-27 | 2017-08-11 | 厦门天马微电子有限公司 | A kind of array base palte and its application method, display panel, display device |
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| CN105867033B (en) * | 2016-06-13 | 2019-06-14 | 厦门天马微电子有限公司 | Array substrate and liquid crystal display panel |
| CN107290912A (en) * | 2017-07-24 | 2017-10-24 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and its driving method |
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| CN105301814A (en) * | 2015-11-26 | 2016-02-03 | 深圳市华星光电技术有限公司 | Power supply circuit with detection function and display panel |
| CN107037656A (en) * | 2017-05-27 | 2017-08-11 | 厦门天马微电子有限公司 | A kind of array base palte and its application method, display panel, display device |
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