CN111179768A - Display panel, display device and electronic equipment - Google Patents
Display panel, display device and electronic equipment Download PDFInfo
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- CN111179768A CN111179768A CN201911310007.2A CN201911310007A CN111179768A CN 111179768 A CN111179768 A CN 111179768A CN 201911310007 A CN201911310007 A CN 201911310007A CN 111179768 A CN111179768 A CN 111179768A
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Abstract
The invention discloses a display panel, a display device and electronic equipment. The main technical scheme is as follows: the display panel comprises a TFT substrate, a black matrix layer, an insulating layer, a second electrode layer and an encapsulation layer which are sequentially stacked, wherein the black matrix layer comprises a pixel opening area, the pixel opening area is covered with a first electrode layer, and the insulating layer covers the position of the first electrode layer corresponding to the side wall of the pixel opening area and the black matrix layer; the first electrode layer comprises a first area and a second area which are mutually separated, the second electrode layer comprises a third area and a fourth area which are mutually separated, the orthographic projection of the first area facing the TFT substrate is in the orthographic projection of the third area facing the TFT substrate, and the orthographic projection of the second area and the orthographic projection of the fourth area facing the TFT substrate are completely overlapped; the light-emitting pixel layer is arranged between the first region and the third region; the passivation layer is arranged between the second region and the fourth region; and under the action of external force, the passivation layer deforms to change the capacitance between the second region and the fourth region.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a display panel, a display device and electronic equipment.
Background
The Micro LED is a new generation display technology, the LED structure design is thinned, miniaturized and arrayed, and the size of the Micro LED is only about 1-10 mu m grade; then, transferring the micron RGB Micro LEDs to a circuit substrate in batch mode by a huge Micro transfer technology; and then, finishing the protective layer and the upper electrode by utilizing a physical deposition process, and then packaging to obtain the micro LED display substrate.
Currently, the development of micro-LED display screens mainly has two trends, namely indoor/outdoor display screens with small spacing, large size and high resolution and wearable devices (such as Apple Watch), wherein the display part of the devices requires high resolution, strong portability, low power consumption and high brightness; the current development trend is that a pressure sensing technology is additionally arranged in a micro-LED display screen to detect pressure touch; the commonly adopted technical means is to additionally add a film with a pressure sensing array.
However, when a thin film having a pressure sensing array is additionally added, the thin film cannot be located on the surface of the display screen due to the thickness and the light transmittance of the thin film, which results in an increase in the overall thickness of the display screen.
Disclosure of Invention
In view of this, embodiments of the present invention provide a display panel, a display device, and an electronic apparatus, and mainly aim to solve the problem that the thickness of the display screen is increased due to the introduction of a thin film with a pressure sensing array for pressure measurement and control in a conventional micro-LED display screen.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides a display panel, which includes a TFT substrate, a black matrix layer, an insulating layer, and a second electrode layer sequentially stacked, where the black matrix layer includes a pixel opening area, the pixel opening area is covered with a first electrode layer, and the insulating layer covers a position of the first electrode layer corresponding to a side wall of the pixel opening area and the black matrix layer; wherein:
the first electrode layer comprises a first area and a second area, and the first area and the second area are mutually isolated;
the second electrode layer comprises a third area and a fourth area, the third area and the fourth area are mutually isolated, the orthographic projection of the first area facing the TFT substrate is in the orthographic projection of the third area facing the TFT substrate, and the orthographic projection of the second area and the orthographic projection of the fourth area facing the TFT substrate completely coincide;
a light emitting pixel layer disposed between the first region and the third region, and both the first region and the third region are electrically connected to the TFT substrate;
a passivation layer disposed between the second region and the fourth region, and both the second region and the fourth region are electrically connected to the TFT substrate;
and under the action of external force, the passivation layer deforms to change the capacitance between the second region and the fourth region.
The purpose and the technical problem to be solved can be further realized by adopting the following technical measures;
optionally, in the display panel, the second region is disposed adjacent to the first region.
Optionally, the first region includes a first sub-region and a second sub-region, the first sub-region and the second sub-region are disposed at an interval, and the second region is disposed between the first sub-region and the second sub-region.
Optionally, in the display panel, the first sub-region, the second sub-region and the second sub-region are all disposed in a ring shape in the pixel opening region.
Optionally, in the display panel, the first sub-region, the second region, and the second sub-region are sequentially disposed along a first direction in the pixel opening region; wherein the first direction is a single linear direction within the pixel opening area.
Optionally, in the display panel, the first region includes a first sub-region, a second sub-region and a third sub-region, and the second region is disposed between the first sub-region and the second sub-region, and the second region is disposed between the second sub-region and the third sub-region.
Optionally, in the display panel, the passivation layer is disposed on a circumferential direction of the light emitting pixel layer.
Optionally, in the display panel, the first region and the second region are both electrically connected to a row driving circuit of the TFT substrate;
the third region and the fourth region are both electrically connected to a common electrode of the TFT substrate.
In another aspect, an embodiment of the present invention provides a display device, which includes any one of the foregoing display panels.
In another aspect, an embodiment of the present invention provides an electronic device, which includes the foregoing display device.
By the technical scheme, the display panel, the display device and the electronic equipment at least have the following advantages: in order to solve the problem that the whole thickness of the display screen is increased due to the fact that a film with a pressure sensing array is introduced into the traditional micro-LED display screen for realizing pressure measurement and control, the pressure sensor is arranged in the pixel opening area, namely the second area and the fourth area which are matched with the passivation layer to form pressure sensing are manufactured on the first area and the third area corresponding to the light-emitting pixel layer in the same layer, so that the passivation layer deforms when external force is applied, and the capacitance between the second area and the fourth area changes to measure and control the pressure; according to the technical scheme, the passivation layer, the first electrode layer and the second electrode layer are used for forming the pressure sensor on the basis of the traditional display panel, additional introduction is not needed, integrated light emitting and pressure touch control are compatible, detection of pressure touch control can be guaranteed, and the size of the display panel or the display device can be guaranteed against being influenced.
Drawings
Fig. 1 is a schematic partial cross-sectional view of a display panel according to an embodiment of the invention;
fig. 2 is another schematic cross-sectional view of a display panel according to an embodiment of the invention;
FIG. 3 is a top view of the display panel of FIG. 2;
fig. 4 is a top view of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of the display panel of FIG. 4;
fig. 6 is a circuit diagram of a driving circuit of a display panel according to an embodiment of the invention;
fig. 7 is a plan structure diagram of a display panel according to an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to the embodiments, structures, features and effects of the display panel, the display device and the electronic device according to the present invention with reference to the accompanying drawings and the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In order to solve the technical problems, the embodiment of the invention has the following general idea:
referring to fig. 1, a display panel according to an embodiment of the present invention includes a TFT substrate 1, a black matrix layer 2, an insulating layer 4, and a second electrode layer 5, which are sequentially stacked, where the black matrix layer 2 includes a pixel opening area 21, the pixel opening area 21 is covered with a first electrode layer 3, and the insulating layer 4 is covered on the first electrode layer 3 and the black matrix layer 2 except for a bottom of the pixel opening area 21; wherein: the first electrode layer 3 comprises a first region 31 and a second region 32, and the first region 31 and the second region 32 are isolated from each other; the second electrode layer 5 comprises a third region 51 and a fourth region 52, the third region 51 and the fourth region 53 are isolated from each other, the orthographic projection of the first region 31 towards the TFT substrate is in the orthographic projection of the third region 51 towards the TFT substrate, and the orthographic projection of the second region 32 and the orthographic projection of the fourth region 52 towards the TFT substrate completely coincide;
the TFT substrate also comprises a light-emitting pixel layer 6 and a passivation layer 7, wherein the light-emitting pixel layer 6 is arranged between the first region 31 and the third region 51, and the first region 31 and the third region 51 are electrically connected with the TFT substrate 1; the passivation layer 7 is disposed between the second region 32 and the fourth region 52, and both the second region 32 and the fourth region 52 are electrically connected to the TFT substrate 1;
wherein, the passivation layer 7 deforms under the action of an external force to change the capacitance between the second region 32 and the fourth region 52.
Specifically, in order to solve the problem that the whole thickness of a conventional micro-LED display screen is increased due to the introduction of a thin film with a pressure sensing array for pressure measurement and control, an embodiment of the present invention provides a display panel, which includes the TFT substrate 1, the black matrix layer 2, the first electrode layer 3, the insulating layer 4, the second electrode layer 5, the light emitting pixel layer 6, and the passivation layer 7; the TFT substrate 1, the black matrix layer 2, the insulating layer 4 and the second electrode layer 5 are sequentially stacked from bottom to top, the black matrix layer 2 comprises a plurality of inverted-trapezoid-shaped pixel opening areas 21 or inverted-trapezoid-shaped grooves, and the first electrode layer 3 covers the pixel opening areas 21, namely the first electrode layer 3 covers the bottom and the side walls of the inverted-trapezoid-shaped grooves; the insulating layer 4 is arranged upwards from the side wall of the inverted trapezoidal groove and covers a part of the first electrode layer 3 and the black matrix layer 2 exposed outside the first electrode layer 3; the first electrode layer 3 includes a first region 31 and a second region 32 isolated from each other (the first region 31 and the second region 32 are isolated by photolithography or the like when the first electrode layer 3 is manufactured), the second electrode layer 5 includes a third region 51 and a fourth region 52 isolated from each other on the upper side (the second region 32 and the fourth region 52 are isolated by photolithography or the like when the second electrode layer 5 is manufactured), the first sub-region 311 and the fourth region 511 are disposed on the lower and upper sides of the light emitting pixel layer 6 (the light emitting pixel layer 6 is electrically connected to the first region 31) as the bottom electrode and the top electrode of the light emitting pixel layer 6, and referring to fig. 7, the first region 31 is electrically connected to the row driving circuit (Gate driving circuit, Gate) of the TFT substrate 1, and the third region 51 is electrically connected to the common electrode (Vcom) of the TFT substrate 1 (shown in fig. 1) to realize the isolation of the first electrode layer 3 from the common electrode (shown in fig. 1) The light-emitting pixel layer 6 is driven to emit light, and the light-emitting pixel layer 6 is provided with a passivation layer 7 in the circumferential direction between the first region 31 and the third region 51; the second region 31 and the fourth region 52 are disposed on the lower and upper sides of the passivation layer 7 to form a pressure sensor 8, the second region 31 and the fourth region 52 are respectively used as a bottom electrode and a top electrode of the pressure sensor 8, so that the second region 32 is electrically connected to a row driving circuit (Gate driving circuit, Gate) of the TFT substrate 1, and the fourth region 52 is electrically connected to a common electrode (Vcom) (not shown in fig. 1) of the TFT substrate 1 to collect capacitance changes between the second region 32 and the fourth region 52, specifically, when an external force is applied, the passivation layer 7 is deformed to change the capacitance between the second region 32 and the fourth region 52, and then the magnitude of the external force is determined or measured, which is a manner known to those skilled in the art for measuring the magnitude of pressure through the capacitance changes, will not be described in detail herein; the TFT substrate 1 is the same as the prior art and is known by the technicians in the field; the black matrix layer 2 forms the pixel opening area 21 for preventing light mixing between adjacent light emitting sub-pixels, and is a black matrix which is the same as the prior art and is well known to those skilled in the art; the first electrode layer 3 is an electrode layer known to those skilled in the art, which is the same as the prior art, and adopts an opaque reflective material such as aluminum/molybdenum/titanium as a bottom electrode, and is electrically connected to a row driving circuit (Gate driving circuit, Gate) of the TFT substrate 1 (including the first region 31 and the second region 32 which are isolated); the second electrode layer 5 is the same as the prior art and is well known to those skilled in the art, and transparent materials such as a-Si/ITO/IZO/carbon nanotube are used as a top electrode; the insulating layer 4 is the same as the prior art and is well known to those skilled in the art, and adopts SiO/SiN/PMMA/PI, etc. with a thickness of 1um-1.05um, and the bottom area of the pixel opening area 21 is left by means of photolithography, etc. and is used for insulating the first electrode layer 3 and the second electrode layer 5; the passivation layer 7 is made of the same material as the prior art, which is well known to those skilled in the art, such as PMMA/PI, etc., in order to prevent the second electrode layer 5 from short-circuiting with the first electrode layer 3; the light-emitting pixel layer 6 is formed by a plurality of light-emitting sub-pixels, the thickness is 3-5um generally, the light-emitting sub-pixels are PN junction diodes, and the light-emitting sub-pixels are well known to those skilled in the art; when a forward bias is applied to the first electrode layer 3 and the second electrode layer 5 in the Micro LED, so that current flows through the electrodes, electrons and holes are combined in the active region, and single color light is emitted; it should be noted that the pressure sensor 8 composed of the second region 32, the passivation layer 7 and the fourth region 52 corresponds to at least one sub-pixel; the plurality of pressure sensors 8 are all electrically connected to each other.
According to the above list, the display panel, the display device and the electronic apparatus of the present invention have at least the following advantages: arranging a pressure sensor 8 in the pixel opening area 21, namely manufacturing a second area 32 and a fourth area 52 which are matched with the passivation layer 7 to form pressure sensing on the first area 31 and the third area 51 corresponding to the light-emitting pixel layer 6 in the same layer, so that the passivation layer deforms when external force is applied, and the capacitance between the second area 32 and the fourth area 52 changes to measure and control the pressure; according to the technical scheme, the passivation layer 7, the first electrode layer 3 and the second electrode layer 5 are used for forming the pressure sensor 8 on the basis of the traditional display panel, additional introduction is not needed, integrated light emitting and pressure touch control are compatible, detection of pressure touch control can be guaranteed, and the size of the display panel or the display device cannot be influenced.
The term "and/or" herein is merely an associative relationship describing an associated object, meaning that three relationships may exist, e.g., a and/or B, specifically understood as: both a and B may be included, a may exist alone, or B may exist alone, and any of the three cases can be provided.
Further, in a specific implementation of the display panel provided in the embodiment of the present invention, the second region 32 is disposed adjacent to the first region 31.
Specifically, in order to realize that the pressure sensor 8 and the original light-emitting pixel share the upper and lower electrodes, avoid additional introduction of a process flow and ensure the requirement of the product on the thickness, in the technical scheme adopted by the invention, the second region 32 and the first region 31 are adjacently arranged, and the corresponding fourth region 52 and the corresponding third region 51 are also adjacently arranged.
Example 1
Further, referring to fig. 1 to 5, in an implementation, the first region 31 includes a first sub-region 311 and a second sub-region 312, the first sub-region 311 and the second sub-region 312 are disposed at an interval, and the second region 32 is disposed between the first sub-region 311 and the second sub-region 312.
Specifically, on the premise that the second region 32 is disposed adjacent to the first region 31, in the technical solution adopted by the present invention, referring to fig. 1, the first region 31 is divided into the first sub-region 311 and the second sub-region 312, the second region 32 is disposed between the first sub-region 311 and the second sub-region 312, and the second region 32, the first sub-region 311, and the second sub-region 312 are both in a blocking state; correspondingly, the third region 51 also includes a fourth sub-region 511 and a fifth sub-region 512, the fourth sub-region 511 corresponds to the first sub-region 311, and the fifth sub-region 512 corresponds to the second sub-region 312; specifically, the first sub-region 311, the second region 32, and the second sub-region 312 are sequentially disposed in the pixel opening region 21 along a first direction; the first direction here may be left to right, right to left, front to back, back to front, taking fig. 1 as an example; taking fig. 1 as an example, the first sub-region 311, the second region 32 and the second sub-region 312 are disposed from left to right in the pixel opening region 21, that is, the second region 32 is on the right side of the first region 31, that is, the pressure sensor 8 is on the right side of the light-emitting pixel.
Specifically, on the premise that the second region 32 is disposed adjacent to the first region 31, in the technical solution adopted by the present invention, referring to fig. 4 and 5, the first sub-region 311, the second region 32, and the second sub-region 312 are all disposed in a ring shape in the pixel opening region 21; that is to say, in fig. 5, the fourth area 52 surrounds the third sub-area 511, the fourth sub-area 512 surrounds the fourth area 52, and the first electrode layer 3 is correspondingly disposed according to the disposing manner of the second electrode layer 5, which is not described herein again; in fig. 4, the second regions 32 are disposed on both left and right sides of the first sub-region 311, and the second sub-regions 312 are disposed on both sides of the second regions 32 away from the first region 31, so that the coverage area of the pressure sensor 8 in the pixel opening region 21 is larger, and the sensitivity of the product is improved.
Example 2
Further, reference is made to fig. 3 and 2; in a specific implementation, the first region 31 includes a first sub-region 311, a second sub-region 312, and a third sub-region 313, and the second region 312 is disposed between the first sub-region 311 and the second sub-region 312, and the second region 312 is disposed between the second sub-region 312 and the third sub-region 313.
Specifically, on the premise that the third region 51 is arranged adjacent to the first region 31, in the technical scheme adopted by the present invention, the first region 31 is divided into a three-section first sub-region 311, a second sub-region 312 and a third sub-region 313, and the second region 32 is arranged between each two sections; correspondingly, the third region 51 is also correspondingly partitioned into a three-segment fourth sub-region 511, a fifth sub-region 512 and a sixth sub-region 513, the fourth sub-region 511, the fifth sub-region 512 and the sixth sub-region 513 correspond to the first sub-region 311, the second sub-region 312 and the third sub-region 313 in sequence, and referring to fig. 2, the cross-sectional view thereof is similar to the cross-sectional view of the ring-shaped arrangement manner in the previous embodiment, but actually, in this embodiment, the pressure sensors 8 are disposed on two sides of the light-emitting pixels, for example, on the left and right sides or the front and back sides of the light-emitting pixels, and referring to fig. 4, the pressure sensors 8 are disposed on the left and right sides of the light-emitting pixels, which also has the effect of increasing the coverage area of the pressure sensors 8 in the.
Further, referring to fig. 6, in a specific implementation of the display panel provided in the embodiment of the present invention, in order to implement compatibility between pixel display and pressure touch, the present invention designs a circuit diagram as shown in fig. 6, where C1 is a TFT storage capacitor, C2 is a capacitor between the second region 32 and the fourth region 52 of the pressure sensor 8 in the above embodiment, T3 and T6 are driving transistors and switching transistors commonly known to those skilled in the art, and D1 is the aforementioned P-N junction light emitting diode; the circuit is a part of a TFT circuit, and the working principle is as follows:
a charging stage: the control line (Vscan) receives a high level signal from the TFT circuit, the switching transistor T6 is turned on, the current generated by the data line current charges the capacitors C1 and C2, the control line Vscan is set low after charging, and T6 is turned off;
a light emitting stage: c1 continuous discharge maintains the driving tube T3 to be turned on, D1 outputs stable current through VDD to make it emit light;
a pressure touch stage: when the passivation layer 7 deforms and the capacitor C2 changes during touch control by external pressure, the detected change of the C2 value is sent to a control chip of the display device through a TFT circuit, and then the pressure identification calculation is realized;
it should be noted that the light-emitting stage and the pressure touch stage are time-sharing control, and the time-sharing control is difficult to implement in the prior art and in the information known to those skilled in the art, for example, in the time-sharing control of display and touch of the existing touch screen, a control chip of the display device sends out a driving frequency to perform display driving, and drives touch in a gap of the frequency, which is not described herein in detail; the information acquisition of the capacitor C2 is carried out in the gap of the driving frequency according to the scheme.
Example 3
Further, an embodiment of the present invention provides a display device, which includes any one of the display panels described in the above embodiments or a display panel obtained by combining the above embodiments.
Specifically, the display device is inevitably provided with a control chip, and therefore, the specific working principle of display driving and pressure touch of the display device refers to the content of the above embodiments, and will not be described in detail herein.
The display panel in this embodiment is the display panel described in any one of embodiments 1 to 2 or a display panel obtained by combining the display panels; the above embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto in any way, so that the above embodiments can be combined, and any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention
Example 4
Further, an electronic device provided in an embodiment of the present invention includes the display device described in embodiment 3.
It is to be noted that the display device in this embodiment is the display device described in embodiment 3; the above embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto in any way, so that the above embodiments can be combined, and any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A display panel comprises a TFT substrate, a black matrix layer, an insulating layer, a second electrode layer and an encapsulation layer which are sequentially stacked, wherein the black matrix layer comprises a pixel opening area, the pixel opening area is covered with a first electrode layer, and the insulating layer covers the position of the first electrode layer corresponding to the side wall of the pixel opening area and the black matrix layer; the method is characterized in that:
the first electrode layer comprises a first area and a second area, and the first area and the second area are mutually isolated;
the second electrode layer comprises a third area and a fourth area, the third area and the fourth area are mutually isolated, the orthographic projection of the first area facing the TFT substrate is in the orthographic projection of the third area facing the TFT substrate, and the orthographic projection of the second area and the orthographic projection of the fourth area facing the TFT substrate completely coincide;
a light emitting pixel layer disposed between the first region and the third region, and both the first region and the third region are electrically connected to the TFT substrate;
a passivation layer disposed between the second region and the fourth region, and both the second region and the fourth region are electrically connected to the TFT substrate;
and under the action of external force, the passivation layer deforms to change the capacitance between the second region and the fourth region.
2. The display panel according to claim 1, wherein:
the second region is disposed adjacent to the first region.
3. The display panel according to claim 2, wherein:
the first area comprises a first sub-area and a second sub-area, the first sub-area and the second sub-area are arranged at intervals, and the second area is arranged between the first sub-area and the second sub-area.
4. The display panel according to claim 3, wherein:
the first sub-region, the second region, and the second sub-region are all arranged in a ring shape in the pixel opening region.
5. The display panel according to claim 3, wherein:
the first sub-area, the second area and the second sub-area are sequentially arranged in the pixel opening area along a first direction;
wherein the first direction is a single linear direction within the pixel opening area.
6. The display panel according to claim 2, wherein:
the first area comprises a first sub-area, a second sub-area and a third sub-area, and the second area is arranged between the first sub-area and the second sub-area and between the second sub-area and the third sub-area respectively.
7. The display panel according to any one of claims 3 or 6, wherein:
the passivation layer is arranged on the periphery of the light-emitting pixel layer.
8. The display panel according to claim 1, wherein:
the first region and the second region are electrically connected with a row driving circuit of the TFT substrate;
the third region and the fourth region are both electrically connected to a common electrode of the TFT substrate.
9. A display device, characterized in that:
comprising a display panel as claimed in any one of the claims 1-8.
10. An electronic device, characterized in that:
comprising a display device as claimed in claim 9.
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