CN108133671B - Display panel, display device and driving method of display panel - Google Patents
Display panel, display device and driving method of display panel Download PDFInfo
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- CN108133671B CN108133671B CN201711266299.5A CN201711266299A CN108133671B CN 108133671 B CN108133671 B CN 108133671B CN 201711266299 A CN201711266299 A CN 201711266299A CN 108133671 B CN108133671 B CN 108133671B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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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]
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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]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Abstract
The invention relates to the technical field of display, and discloses a display panel, a display device and a driving method of the display panel, so that the display panel can save power consumption, accurately control gray scales and have a better display effect. The display panel comprises a substrate base plate and a plurality of display units arranged on the substrate base plate, wherein each display unit comprises an organic light-emitting display unit and a micro light-emitting diode display unit; when the display unit displays low gray scale, the organic light emitting display unit is started, and the micro light emitting diode display unit is closed; when the display unit displays the high gray scale, the organic light emitting display unit is turned off or turned on, and the micro light emitting diode display unit is turned on, wherein the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, X and Y are positive integers, and Y is the highest gray scale of the display screen.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, a display device, and a driving method of the display panel.
Background
A display panel formed by an Organic Light-Emitting Diode (OLED) has the advantages of being thin, Light, wide in viewing angle, active in Light emission, continuously adjustable in Light emission color, low in cost, fast in response speed, wide in working temperature range, simple in production process, flexible in display, and the like, and is thus regarded as a next generation display technology with great development prospects.
The display panel formed by the OLED in the prior art has the disadvantages of low luminous efficiency and high power consumption, especially when the display panel displays high gray scale. Therefore, how to improve the light emitting efficiency of the display panel and reduce the power consumption is a technical problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a display panel, a display device and a driving method of the display panel, which are used for solving the problems of low luminous efficiency and high power consumption of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including a substrate, and a plurality of display units disposed on the substrate, where each display unit includes an organic light emitting display unit and a micro light emitting diode display unit;
when the display unit displays low gray scale, the organic light emitting display unit is started, and the micro light emitting diode display unit is closed;
when the display unit displays high gray scale, the organic light emitting display unit is turned off or on, the micro light emitting diode display unit is turned on, wherein,
the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, wherein X and Y are positive integers, and Y is the highest gray scale of the display screen.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the display panel described above.
In a third aspect, an embodiment of the present invention further provides a driving method applied to the display panel, where the display panel further includes a driving unit, a first pixel driving circuit and a second pixel driving circuit, where the driving unit turns on or off the organic light emitting display unit through the first pixel driving circuit, and turns on or off the micro light emitting diode display unit through the second pixel driving circuit;
when the display unit displays low gray scale, the organic light emitting display unit is started, and the micro light emitting diode display unit is closed;
when the display unit displays high gray scale, the organic light emitting display unit is turned off or on, the micro light emitting diode display unit is turned on, wherein,
the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, wherein X and Y are positive integers, and Y is the highest gray scale of the display screen.
The beneficial effects of the aspects and any possible implementation described above are as follows:
the organic light emitting display unit and the micro light emitting diode display unit are arranged in each display unit, and when the display units display low gray scales, the organic light emitting display unit is started, and the micro light emitting diode display unit is closed; when the display unit displays high gray scale, the organic light emitting display unit is closed or opened, the micro light emitting diode display unit is opened, the requirements of low gray scale display and high gray scale control precision of the display unit are met, the brightness nonuniformity caused by voltage nonuniformity is reduced, meanwhile, the requirements of high gray scale display, high efficiency of the display unit and remarkable reduction of power consumption are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a top view of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic view of a driving current-luminance broken line of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a driving current-luminance broken line of another display panel according to an embodiment of the present invention;
FIG. 4a is a schematic voltage-current curve diagram of a micro LED display unit according to an embodiment of the present invention;
FIG. 4b is a schematic diagram illustrating a current-optical power curve of a micro LED display unit according to an embodiment of the present invention;
FIG. 4c is a schematic voltage-current density curve of an OLED unit according to an embodiment of the present invention;
FIG. 4d is a graph illustrating a current density-luminance curve of an OLED unit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first pixel driving circuit according to an embodiment of the present invention;
FIG. 6 is a diagram of a second pixel driving circuit according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of the display panel shown in FIG. 1 along direction AA';
FIG. 8 is an enlarged schematic view of portion A of FIG. 7;
FIG. 9 is a graph of voltage versus current for a P-type TFT and an N-type TFT;
fig. 10 is a manufacturing method of a display panel according to an embodiment of the invention;
FIG. 11 is a top view of another display panel according to an embodiment of the present invention;
fig. 12 is a schematic view of a display device according to an embodiment of the invention;
fig. 13 is a driving method suitable for the display panel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a top view of a display panel provided in an embodiment of the present invention includes a substrate 1 and a plurality of display units 2 disposed on the substrate 1, where each display unit 2 includes an organic light emitting display unit 3 and a micro light emitting diode display unit 4. The Micro Light Emitting Diode display unit 4 is composed of Micro-Light Emitting diodes (Micro-leds), and the Micro-Led display unit 4 has the advantages of high Light Emitting efficiency, low energy consumption, high resolution and the like, and the size of the Micro-Led display unit is only about 1-100 μm. As shown in fig. 2, which is a broken-line diagram of driving current-luminance of a display panel according to an embodiment of the present invention, with reference to fig. 1, when the display unit 2 displays low gray scale, the organic light emitting display unit 3 is turned on, and the micro-led display unit 4 is turned off; when the display unit 2 displays the high gray scale, the organic light emitting display unit 3 is turned off, and the micro light emitting diode display unit 4 is turned on. As shown in fig. 3, which is a broken-line diagram of driving current-luminance of another display panel according to an embodiment of the present invention, with reference to fig. 1, when the display unit 2 displays low gray scale, the organic light emitting display unit 3 is turned on, and the micro-led display unit 4 is turned off; when the display unit 2 displays the high gray scale, the organic light emitting display unit 3 is turned on, the micro light emitting diode display unit 4 is turned on, and at this stage, the organic light emitting display unit 3 keeps the low gray scale brightness unchanged, and the brightness of the organic light emitting display unit 3 and the brightness of the micro light emitting diode display unit 4 are superposed. The embodiment of the invention can avoid the discontinuity of pixel brightness and chromaticity caused by the change of the light-emitting device when the display is carried out from low gray scale to high gray scale, thereby ensuring better display effect. Meanwhile, since the brightness of the organic light emitting display unit 3 is always kept below the low gray scale, the power consumption can be saved. The gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, wherein X and Y are positive integers, and Y is the highest gray scale of the display screen. For example, X may be 128 and Y may be 256.
As shown in fig. 4a-4b, fig. 4a is a schematic voltage-current curve diagram of a micro led display unit according to an embodiment of the present invention; FIG. 4b is a schematic diagram illustrating a current-optical power curve of a micro LED display unit according to an embodiment of the present invention; FIG. 4c is a schematic voltage-current density curve of an OLED unit according to an embodiment of the present invention; fig. 4d is a graph illustrating a current density-luminance curve of an organic light emitting display unit according to an embodiment of the present invention. Wherein the optical power is the work performed by the light per unit time. The current density vector is a physical quantity describing the intensity and flow direction of a current at a certain point in a circuit. The brightness is a physical quantity of the intensity of light emission (reflection) on the surface of a light-emitting body (reflector). As can be seen from analyzing fig. 4a-4b, the light emitting efficiency and brightness of the micro led display unit are higher than those of the organic light emitting display unit, and thus, the change of the current causes the brightness of the micro led display unit to change greatly, which makes the gray-scale value control difficult. Compared with a micro light-emitting diode display unit, the voltage-current-brightness curve of the organic light-emitting display unit is gentler than that of the micro light-emitting diode display unit, gray scale value accurate control is easier to achieve, the display effect is better, the brightness uniformity is better, and meanwhile, the light-emitting efficiency is low and the power consumption is high. According to the display panel provided by the embodiment of the invention, the organic light-emitting display unit and the micro light-emitting diode display unit are arranged in each display unit, and when the display units display low gray scales, the organic light-emitting display unit is started, and the micro light-emitting diode display unit is closed; when the display unit displays high gray scale, the organic light emitting display unit is closed or opened, the micro light emitting diode display unit is opened, the requirements of low gray scale display and high gray scale control precision of the display unit are met, the brightness nonuniformity caused by voltage nonuniformity is reduced, meanwhile, the requirements of high gray scale display, high efficiency of the display unit and remarkable reduction of power consumption are met.
In the display panel provided in the embodiment of the present invention, the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, and the gray scale value range of the high gray scale is greater than X and less than or equal to Y, where X and Y are positive integers, and Y is the highest gray scale of the display screen. Alternatively, X may be 128 and Y may be 256.
The display panel provided by the embodiment of the invention further comprises a first pixel driving circuit and a second pixel driving circuit, wherein each organic light-emitting display unit is coupled with one corresponding first pixel driving circuit, and the first pixel driving circuit controls the on and off of the organic light-emitting display unit; each micro light-emitting diode display unit is coupled with one corresponding second pixel driving circuit, and the second pixel driving circuit controls the on and off of the micro light-emitting diode display unit. The first pixel driving circuit comprises a first thin film transistor, the second pixel driving circuit comprises a second thin film transistor, and the first thin film transistor and the second thin film transistor respectively comprise a source electrode, a drain electrode and a grid electrode.
Alternatively, as shown in fig. 5, for the first pixel driving circuit schematic diagram provided in the embodiment of the present invention, one organic light emitting display unit 3 is coupled to a corresponding one of the first pixel driving circuits 51, and the first pixel driving circuit 51 includes a first thin film transistor T1, a switching thin film transistor T, and a storage capacitor Cs. With reference to fig. 5, the display panel according to the embodiment of the invention further includes a first data line 71, a first scan line 81, and a driving unit (not shown). The first thin film transistor T1 is a driving thin film transistor for driving the organic light emitting display unit 3 to emit light, and when the driving unit inputs a first driving signal to the first pixel driving circuit 51 through the first scan line 81, the switching thin film transistor T is turned on, and the driving unit transmits a first data signal to the gate layer G1 of the first thin film transistor T2 through the first data line 71 and simultaneously charges the storage capacitor Cs. Then, the first thin film transistor T1 is turned on, the driving current flows from the power source terminal (Vdd) through the organic light emitting display unit 3 to the ground terminal, and the organic light emitting display unit 3 emits light by the driving current. After the switching thin film transistor T is turned off, due to the holding function of the storage capacitor Cs, the voltage of the gate layer G1 of the first thin film transistor T1 is kept unchanged during one frame of display time period, so that the first thin film transistor T1 is continuously turned on during the whole display time period, and the driving current can flow from the power supply terminal (Vdd) to the ground terminal of the organic light emitting display unit 3 during the whole display time period, thereby ensuring that the organic light emitting display unit 3 can normally emit light during the whole display time period. The above-described switching thin film transistor T, first thin film transistor T1, and storage capacitor Cs may be provided on the substrate base plate.
Alternatively, as shown in fig. 6, for a schematic diagram of a second pixel driving circuit provided in the embodiment of the present invention, one micro light emitting diode display unit 4 is coupled to a corresponding second pixel driving circuit 52, and the second pixel driving circuit 52 includes a second thin film transistor T2, a switching thin film transistor T and a storage capacitor Cs. With continued reference to fig. 6, the display panel according to the embodiment of the invention further includes a second data line 72, a second scan line 82, and a driving unit (not shown). The second tft T2 is a driving tft for driving the micro led display unit 4 to emit light, and when the driving unit inputs a second driving signal to the second pixel driving circuit 52 through the second scan line 82, the switching tft T is turned on, and the driving unit transmits a second data signal to the gate layer G2 of the second tft T2 through the second data line 72 and simultaneously charges the storage capacitor Cs. Then, the second thin film transistor T2 is turned on, and the driving current flows from the power source terminal (Vdd) through the micro-led display unit 4 to the common signal line 62, and the micro-led display unit 4 emits light under the action of the driving current. After the switching thin film transistor T is turned off, due to the holding function of the storage capacitor Cs, the voltage of the gate layer G2 of the second thin film transistor T2 is kept unchanged in one frame display period, so that the second thin film transistor T2 is continuously turned on in the whole display period, and the driving current can flow from the power supply terminal (Vdd) to the common signal line 62 through the micro light emitting diode display unit 4 in the whole display period, thereby ensuring that the micro light emitting diode display unit 4 can normally emit light in the whole display period. The above-described switching thin film transistor T, second thin film transistor T2, and storage capacitor Cs may be provided on the substrate, wherein the common signal line 62 may be a ground line.
Optionally, the first pixel driving circuit and the second pixel driving circuit may share a scan line, that is, the driving unit inputs driving signals to the first pixel driving circuit and the second pixel driving circuit through the same scan line, inputs a first data signal to the first pixel driving circuit through the first data line, and inputs a second data signal to the second pixel driving circuit through the second data line.
It should be noted that the first pixel driving circuit and the second pixel driving circuit are only examples, and other pixel driving circuits may be used on the substrate provided in the embodiment of the present invention, which is not limited in the embodiment of the present invention.
Optionally, as shown in fig. 7, which is a schematic cross-sectional view of the display panel shown in fig. 1 along the direction AA', the display panel further includes a planarization layer 5, and the organic light emitting display unit 3 includes an anode 31, a light emitting functional layer 32, and a cathode 33 sequentially disposed along a surface of the planarization layer 5 away from the substrate base plate 1. A reflective layer (not shown) may be further disposed between the planarization layer 5 and the anode 31, and the reflective layer can reflect light entering the display panel from the light-emitting layer 32 by adopting the structural design, so that the display brightness is relatively uniform. In the present embodiment, the specific type of the reflective layer is not limited, and may be, for example, a silver reflective layer. The display panel further includes a pixel defining layer 6 disposed between the anode 31 and the cathode 33, wherein the pixel defining layer 6 is used to prevent color mixing of the organic light emitting display unit 3, protect the edge of the anode 31, prevent the organic light emitting display unit 3 from being abnormal due to unevenness of the edge of the anode 31, and the like. With reference to fig. 7, the micro led display unit 4 includes a bottom electrode 41, a micro led 42, and a top electrode 43 sequentially disposed along a direction away from the substrate 1, and in this embodiment, the anode 31 of the organic light emitting display unit 3 and the top electrode 43 of the micro led display unit 4 can be fabricated in the same layer, so as to reduce the fabrication steps and the fabrication cost of the display panel. In the present embodiment, the bottom electrode 41 includes a transparent oxide electrode, such as indium tin oxide ITO or indium zinc oxide IZO.
With continued reference to fig. 7, the organic light-emitting display unit 3 includes an anode 31, a light-emitting functional layer 32, and a cathode 33, as well as a hole transport layer (not shown in the figure) and an electron transport layer (not shown in the figure). A hole transport layer and an electron transport layer are located between the anode 31 and the cathode 33, and a light emitting functional layer 32 is disposed between the hole transport layer and the electron transport layer. The organic light emitting display unit 3 emits light in a principle that when a voltage is applied to the anode 31 and the cathode 33, holes from the anode 31 and electrons from the cathode 33 are transported to the light emitting function layer 32 to form excitons. The excitons transition from an excited state to a ground state, thereby generating light, and the light emitting functional layer 33 emits light.
As shown in fig. 8, which is an enlarged schematic view of a part a of fig. 7, the micro light emitting diode display unit 4 includes a bottom electrode 41, a micro light emitting diode 42 and a top electrode 43, and the micro light emitting diode 42 includes a first electrode 421, a first semiconductor layer 422, a light emitting layer 423, a second semiconductor layer 424 and a second electrode 425. Referring to fig. 6 in combination, the first electrode 421 is electrically connected to the second thin film transistor T2 of the second pixel driving circuit 52 through the bottom electrode 41. After the second pixel driving circuit 52 provides the micro led display unit 4 with the operating voltage, the second electrode 424 of the micro led display unit 4 generates electrons, the first electrode 421 generates holes, the holes and the electrons move to the middle light emitting layer 423 under the action of the electric field between the second electrode 424 and the first electrode 421, and when the holes and the electrons meet in the light emitting layer 423, energy is released, so that the light emitting layer 423 emits light.
Alternatively, with reference to fig. 5 and 7, the first Thin film transistor T1 included in the first pixel driving circuit 51 according to the embodiment of the present invention is a low temperature polysilicon Thin film transistor (LTPS TFT), and the anode 31 included in the organic light emitting display unit 3 is electrically connected to the drain D1 of the first Thin film transistor T1. Because the organic light-emitting display unit has low light-emitting efficiency, a larger current is needed for driving, and therefore the driving thin film transistor needs to output a larger current, the mobility requirement is high, and the mobility of the low-temperature polysilicon thin film transistor is very high, so that the organic light-emitting display unit is suitable for the requirement of the organic light-emitting display unit on larger current driving. The low-temperature polycrystalline silicon thin film transistor is preferably a P-type low-temperature polycrystalline silicon thin film transistor, and the problems of uneven display brightness and residual images can be effectively avoided.
Optionally, with reference to fig. 6 and fig. 7, the second thin film transistor T2 of the second pixel driving circuit 52 provided in the embodiment of the present invention is an oxide thin film transistor, and the bottom electrode 41 of the micro light emitting diode display unit 4 is connected to the drain D2 of the second thin film transistor T2. As shown in fig. 9, a voltage-current graph of the low temperature polysilicon thin film transistor and the oxide thin film transistor, a current-voltage graph B1 of the low temperature polysilicon thin film transistor is steeper than a voltage-current graph B2 of the oxide thin film transistor, and thus, the same current change (I1 → I2) is larger than a voltage change Δ V2 of the oxide thin film transistor than a voltage change Δ V1 of the low temperature polysilicon thin film transistor. Therefore, when the oxide thin film transistor is used as a driving thin film transistor of the micro light emitting diode display unit in low gray scale display, the requirement on the output precision of the driving unit is reduced, and the gray scale can be controlled more accurately. Among them, the oxide thin film transistor is preferably an n-type oxide thin film transistor
As shown in fig. 10, a method for manufacturing a display panel according to an embodiment of the present invention, with reference to fig. 7, includes:
step 101, sequentially forming a bottom electrode 41 and a micro light-emitting diode 42 of a micro light-emitting diode display unit 4 on a substrate 1, as shown in fig. 10 (a);
step 102, forming a flat layer 5 on the side of the micro light-emitting diode 42 away from the substrate base plate 1, as shown in fig. 10 (b);
step 103, forming the top electrode 43 on the side of the planarization layer 5 away from the substrate base plate 1, as shown in fig. 10 (c).
In step 101, as shown in fig. 10 (a), a bottom electrode 41 is first formed on a substrate base plate 1, and then a micro light emitting diode 42 is formed on a side of the bottom electrode 41 away from the substrate base plate 1, wherein the micro light emitting diode 42 can be fabricated by a transfer process; in step 102, as shown in fig. 10 (b), a planarization layer 5 is formed on the side of the micro light emitting diode 42 away from the substrate 1, and a via hole 7 is opened from the side of the planarization layer 5 away from the substrate 1; in step 103, as shown in fig. 10 (c), a top electrode 43 is formed on a side of the planarization layer 5 away from the substrate 1, the top electrode 43 is connected to the micro light emitting diode 42 through the via 7, and the anode 31 is disposed on a side of the planarization layer 5 away from the substrate 1. As shown in fig. 10 (d), a light-emitting function layer 32 and a pixel defining layer 6 are formed on the side of the anode 31 remote from the base substrate 1. As shown in fig. 10 (e), a cathode 33 is formed on the side of the light-emitting function layer 32 away from the base substrate 1.
In the embodiment provided by the invention, each display unit comprises an organic light-emitting display unit, and at least one micro light-emitting diode display unit is arranged around the organic light-emitting display unit.
As shown in fig. 11, in another top view of the display panel according to the embodiment of the present invention, each display unit 2 includes an organic light emitting display unit 3, and 2 micro led display units 4 are disposed around the organic light emitting display unit 3. When the plurality of micro light emitting diode display units 4 are arranged around the organic light emitting display unit 3, the plurality of micro light emitting diode display units 4 can be uniformly distributed around the organic light emitting display unit, and the display brightness of the display panel can be more uniform by adopting the structural design. As shown in fig. 1, each display unit 2 of the display panel provided in the embodiment of the present invention further includes an organic light emitting display unit 3, and 1 micro light emitting diode display unit 4 is disposed around the organic light emitting display unit 3.
As shown in fig. 12, a schematic view of a display device according to an embodiment of the present invention is provided, the display device includes the display panel 100, and the working principle of the display panel 100 is described in detail above and is not repeated herein.
It should be noted that the display device according to the embodiment of the present invention may include, but is not limited to, a Personal Computer (PC), a Personal Digital Assistant (PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), a mobile phone, an MP3 player, an MP4 player, and the like.
As shown in fig. 13, in a driving method suitable for the display panel, the display panel further includes a driving unit, a first pixel driving circuit and a second pixel driving circuit, wherein the driving unit turns on or off the organic light emitting display unit through the first pixel driving circuit, and turns on or off the micro light emitting diode display unit through the second pixel driving circuit. The first driving method is: when the display unit displays the low gray scale, the organic light emitting display unit is started, the micro light emitting diode display unit is closed, and when the display unit displays the high gray scale, the organic light emitting display unit is closed, and the micro light emitting diode display unit is started. The second driving method is: when the display unit displays the low gray scale, the organic light emitting display unit is started, the micro light emitting diode display unit is closed, and when the display unit displays the high gray scale, the organic light emitting display unit is started, and the micro light emitting diode display unit is started. The first and second driving methods enable the micro light emitting diode display unit to be turned on when the display panel displays in the low gray scale, so that the requirement of high gray scale control accuracy of the display unit in the low gray scale display is met, the brightness nonuniformity caused by voltage nonuniformity is reduced, and the requirements of high efficiency and remarkably reduced power consumption of the display unit in the high gray scale display are met. In the second driving method, when displaying the high gray scale, the organic light emitting display unit 3 keeps the brightness of the low gray scale unchanged, and the brightness of the organic light emitting display unit 3 and the brightness of the micro light emitting diode display unit 4 are overlapped, so that the discontinuity of pixel brightness and chromaticity caused by the change of a light emitting device when displaying from the low gray scale to the high gray scale can be avoided, and the display effect is better. Meanwhile, since the brightness of the organic light emitting display unit 3 is always maintained at the low gray scale brightness, the power consumption can be saved.
The gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, wherein X and Y are positive integers, and Y is the highest gray scale of the display screen. When the display panel is driven, the first driving method may be used alone, the second driving method may be used alone, or the first and second driving methods may be used in a time-sharing manner.
Optionally, in an embodiment of the present invention, the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to 128, and the gray scale value range of the high gray scale is greater than 128 and less than or equal to 256.
Alternatively, referring to fig. 5, 6 and 13 in combination, the display panel further includes a first data line 71, a second data line 72, a first scan line 81 and a second gate line 82. For each display unit 2, when the driving unit inputs a first driving signal to the first pixel driving circuit 51 through the first scanning line 81, the organic light emitting display unit 3 is turned on, and the first data line 71 inputs a first data signal to the first pixel driving circuit 51; when the second driving signal is input to the second pixel driving circuit 52 through the second scanning line 82 and the micro-led display unit 4 is turned off, the display unit 2 displays low gray scales. For each display unit 2, when the driving unit inputs a first driving signal to the first pixel driving circuit 51 through the first scanning line 81, the organic light emitting display unit 3 is turned on, the first data line 71 inputs a first data signal to the first pixel driving circuit 51, or the organic light emitting display unit 3 is turned off; when a second driving signal is input to the second pixel driving circuit 52 through the second scanning line 82, the micro-led display unit 4 is turned on, and a second data signal is input to the second pixel driving circuit 52 through the second data line 72, the display unit 2 displays high gray scale.
Optionally, the first pixel driving circuit and the second pixel driving circuit may share the same scan line, and for each display unit, when the driving unit inputs a driving signal to the first pixel driving circuit and the second pixel driving circuit through the scan line, the organic light emitting display unit is turned on, the micro light emitting diode display unit is turned off, and the first data line inputs a first data signal to the first pixel driving circuit, the display unit performs low gray scale display;
for each display unit, when the driving unit inputs driving signals to the first pixel driving circuit and the second pixel driving circuit through the scanning line, the organic light-emitting display unit is closed, the micro light-emitting diode display unit is opened, and second data signals are input to the second pixel driving circuit through the second data line, the display unit displays high gray scale.
Alternatively, in another embodiment of the present invention, referring to fig. 5 and 6 in combination, the first pixel driving circuit 51 includes a first thin film transistor T1, the first thin film transistor T1 may be a low temperature polysilicon thin film transistor, and preferably, the first thin film transistor T1 may be a P-type low temperature polysilicon thin film transistor. The second pixel driving circuit 52 includes a second thin film transistor T2, and the second thin film transistor T2 may be an oxide thin film transistor, and preferably, the second thin film transistor T1 may be an n-type oxide thin film transistor.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (20)
1. A display panel comprising a substrate base plate, and a plurality of display units disposed on the substrate base plate, each of the display units comprising an organic light emitting display unit and a micro light emitting diode display unit,
when the display unit displays low gray scale, the organic light emitting display unit is started, and the micro light emitting diode display unit is closed;
when the display unit displays high gray scale, the organic light emitting display unit is turned off or on, the micro light emitting diode display unit is turned on, wherein,
the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, wherein X and Y are positive integers, and Y is the highest gray scale of the display screen.
2. The display panel according to claim 1, wherein the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to 128, and the gray scale value range of the high gray scale is greater than 128 and less than or equal to 256.
3. The display panel of claim 1, further comprising a first pixel driving circuit and a second pixel driving circuit, the first pixel driving circuit comprising a first thin film transistor and the second pixel driving circuit comprising a second thin film transistor, wherein each of the organic light emitting display units is coupled to a corresponding one of the first pixel driving circuits, each of the micro light emitting diode display units is coupled to a corresponding one of the second pixel driving circuits, and each of the first thin film transistor and the second thin film transistor comprises a source, a drain, and a gate.
4. The display panel according to claim 3, further comprising a driving unit, a first data line, a second data line, a first scanning line, and a second scanning line;
the driving unit inputs a first driving signal to the first pixel driving circuit through the first scan line, inputs a first data signal to the first pixel driving circuit through the first data line, inputs a second driving signal to the second pixel driving circuit through the second scan line, and inputs a second data signal to the second pixel driving circuit through the second data line.
5. The display panel according to claim 3, further comprising a driving unit, a first data line, a second data line, a scan line;
the driving unit inputs driving signals to the first pixel driving circuit and the second pixel driving circuit through the scan line, inputs a first data signal to the first pixel driving circuit through the first data line, and inputs a second data signal to the second pixel driving circuit through the second data line.
6. The display panel according to claim 3, wherein the second thin film transistor is an oxide thin film transistor.
7. The display panel according to claim 6, wherein the second thin film transistor is an n-type oxide thin film transistor.
8. The display panel according to claim 6, wherein the micro light emitting diode display unit comprises a bottom electrode, a micro light emitting diode and a top electrode which are sequentially arranged along a direction away from the substrate base plate, and the bottom electrode is electrically connected with the drain electrode of the second thin film transistor.
9. The display panel according to claim 3, wherein the first thin film transistor is a low temperature polysilicon thin film transistor.
10. The display panel according to claim 9, wherein the first thin film transistor is a P-type low temperature polysilicon thin film transistor.
11. The display panel according to claim 9, further comprising a planarization layer, wherein the organic light emitting display unit comprises an anode, a light emitting functional layer, and a cathode sequentially disposed along a surface of one side of the planarization layer away from the substrate, and wherein the anode is electrically connected to the drain of the first thin film transistor.
12. The display panel according to claim 1, wherein each of the display units comprises one of the organic light emitting display units, and at least one of the micro light emitting diode display units is disposed around the organic light emitting display unit.
13. The display panel according to claim 12, wherein one of the micro light emitting diode display units is disposed around the organic light emitting display unit in each of the display units.
14. A display device characterized in that it comprises a display panel according to any one of claims 1 to 13.
15. A driving method applied to the display panel of claim 1,
the display panel further comprises a driving unit, a first pixel driving circuit and a second pixel driving circuit, wherein the driving unit turns on or off the organic light emitting display unit through the first pixel driving circuit and turns on or off the micro light emitting diode display unit through the second pixel driving circuit;
when the display unit displays low gray scale, the organic light emitting display unit is started, and the micro light emitting diode display unit is closed;
when the display unit displays high gray scale, the organic light emitting display unit is turned off or on, the micro light emitting diode display unit is turned on, wherein,
the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to X, the gray scale value range of the high gray scale is greater than X and less than or equal to Y, wherein X and Y are positive integers, and Y is the highest gray scale of the display screen.
16. The method according to claim 15, wherein the gray scale value range of the low gray scale is greater than or equal to 0 and less than or equal to 128, and the gray scale value range of the high gray scale is greater than 128 and less than or equal to 256.
17. The method for driving a display panel according to claim 15,
and further includes a first data line, a second data line, a first scan line and a second scan line, wherein,
for each display unit, when the driving unit inputs a first driving signal to the first pixel driving circuit through the first scanning line, the organic light emitting display unit is started, and the first data line inputs a first data signal to the first pixel driving circuit; inputting a second driving signal to the second pixel driving circuit through the second scanning line, and when the micro light-emitting diode display unit is closed, displaying the display unit in a low gray scale;
for each display unit, when the driving unit inputs a first driving signal to the first pixel driving circuit through the first scanning line, the organic light-emitting display unit is turned on, and the first data line inputs a first data signal to the first pixel driving circuit, or the organic light-emitting display unit is turned off; and inputting a second driving signal to the second pixel driving circuit through the second scanning line, starting the micro light-emitting diode display unit, and displaying high gray scale by the display unit when a second data signal is input to the second pixel driving circuit through the second data line.
18. The method for driving a display panel according to claim 15,
also includes a drive unit, a first data line, a second data line, and a scan line
For each display unit, when the driving unit inputs driving signals to the first pixel driving circuit and the second pixel driving circuit through the scanning line, the organic light-emitting display unit is started, the micro light-emitting diode display unit is closed, and the first data line inputs a first data signal to the first pixel driving circuit, the display unit displays in a low gray scale;
for each display unit, when the driving unit inputs driving signals to the first pixel driving circuit and the second pixel driving circuit through the scanning line, the organic light emitting display unit is closed, the micro light emitting diode display unit is opened, and second data signals are input to the second pixel driving circuit through the second data line, the display unit displays high gray scale.
19. The method for driving a display panel according to claim 15, wherein the first pixel driving circuit includes a first thin film transistor, and the first thin film transistor is a low temperature polysilicon thin film transistor; the second pixel driving circuit comprises a second thin film transistor, and the second thin film transistor is an oxide thin film transistor.
20. The method for driving a display panel according to claim 19, wherein the first thin film transistor is a P-type low temperature polysilicon thin film transistor; the second thin film transistor is an n-type oxide thin film transistor.
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| US10634949B1 (en) * | 2018-10-17 | 2020-04-28 | a.u. Vista Inc. | Display systems and methods involving MIM diodes |
| CN113574585B (en) * | 2018-12-28 | 2024-03-08 | 荣耀终端有限公司 | Display screen, electronic equipment and display screen manufacturing method |
| CN109979981B (en) * | 2019-03-29 | 2021-05-14 | 上海天马微电子有限公司 | Display panel, manufacturing method thereof and display device |
| CN110853512B (en) * | 2019-11-11 | 2022-06-03 | 昆山国显光电有限公司 | Display device and display panel thereof |
| CN114038874B (en) * | 2021-07-27 | 2023-03-24 | 重庆康佳光电技术研究院有限公司 | Display panel and display screen |
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