CN106648213B - Display panel, electronic equipment and driving method - Google Patents
Display panel, electronic equipment and driving method Download PDFInfo
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- CN106648213B CN106648213B CN201610933214.3A CN201610933214A CN106648213B CN 106648213 B CN106648213 B CN 106648213B CN 201610933214 A CN201610933214 A CN 201610933214A CN 106648213 B CN106648213 B CN 106648213B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The invention discloses a display panel, an electronic device and a driving method, wherein the display panel comprises: a liquid crystal layer; the color film substrate is positioned on one side of the liquid crystal layer and comprises a first substrate and a first electrode layer arranged on the first substrate; the first electrode layer comprises a plurality of first electrodes; the array substrate is positioned on the other side of the liquid crystal layer and comprises a second substrate and a common electrode layer arranged on the second substrate; the common electrode layer includes a plurality of second electrodes; the second electrode is provided with a plurality of hollow areas; the pressure detection electrode is arranged in the hollow area; the pressure detection electrodes correspond to the hollow areas one by one; in the touch detection time period, the first electrode and the second electrode are used for touch detection; the first electrode and the pressure detection electrode are used for pressure detection; the first electrode is a strip electrode formed by metal wire grids. According to the technical scheme, the pressure detection is realized by multiplexing the common electrode layer, so that the cost is reduced and the thickness is reduced.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, an electronic device, and a driving method.
Background
With the continuous development of science and technology, more and more electronic devices with display panels are widely applied to daily life and work of people, bring great convenience to daily life and work of people, and become an indispensable important tool for life of people as a police.
The conventional display panel is generally a touch display panel, and has only a function of detecting a touch position and no function of detecting pressure. In order to implement the pressure detection function, in the prior art, a pressure detection sensor is generally added in a display panel or two layers of pressure detection electrodes are added, and the pressure is detected through the pressure detection capacitance change after the pressure detection electrodes are pressed.
Therefore, in order to implement pressure detection, the conventional display panel needs to additionally add a pressure detection sensor or a pressure detection electrode in the display panel, which increases the thickness of the display panel and the manufacturing cost.
Disclosure of Invention
In order to solve the above problems, the present invention provides a display panel and an electronic device, wherein a part of a common electrode layer is multiplexed as a pressure detection electrode to realize pressure detection, thereby reducing the thickness of the display panel and the manufacturing cost.
In order to achieve the above purpose, the invention provides the following technical scheme:
a display panel, comprising:
a liquid crystal layer;
the color film substrate is positioned on one side of the liquid crystal layer and comprises a first substrate and a first electrode layer arranged on the first substrate; the first electrode layer comprises a plurality of first electrodes which are arranged in parallel;
the array substrate is positioned on the other side of the liquid crystal layer and comprises a second substrate and a common electrode layer arranged on the second substrate; the common electrode layer comprises a plurality of second electrodes which are arranged in parallel, and the extending direction of the second electrodes is perpendicular to the extending direction of the first electrodes; each second electrode is provided with a plurality of hollow areas;
the pressure detection electrode is arranged in the hollow area; the pressure detection electrodes correspond to the hollow areas one by one;
the first electrode and the second electrode are used for touch detection in a touch detection time period; in the pressure detection time period, the first electrode and the pressure detection electrode are used for pressure detection; the first electrode is a strip electrode formed by metal wire grids.
The invention also provides electronic equipment which comprises the display panel.
The present invention also provides a driving method for the display panel, including:
inputting a common voltage signal to the second electrode and the pressure detection electrode in a display time period to perform display driving;
sequentially inputting touch scanning signals to a second electrode according to a first preset scanning sequence in a touch detection time period, inputting the same touch scanning signals as the second electrode or inputting a common voltage signal to the pressure detection electrode, and performing touch detection according to a touch detection signal at the output end of the first electrode;
and in a pressure detection time period, inputting a pressure detection signal to the pressure detection electrode according to a second preset scanning sequence, inputting the common voltage signal to the second electrode, inputting a fixed direct current voltage signal to the first electrode, and performing pressure detection according to a pressure induction signal output by the pressure detection electrode.
As can be seen from the above description, in the display panel, the electronic device and the driving method provided in the technical solution of the present invention, a part of the common electrode layer is multiplexed as the pressure detection electrode to implement pressure detection, so that the thickness of the display panel and the manufacturing cost are reduced. Meanwhile, the first electrode on the color film substrate is a strip electrode formed by metal wire grids. The metal grid can be invisible by arranging the pattern structure of the metal grid, so that the first electrode can be prepared by adopting a metal material with the conductivity larger than that of ITO (indium tin oxide), the resistance of the first electrode is reduced, and the sensitivity of pressure detection is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a top view of an array substrate of the display panel shown in FIG. 1;
fig. 3 is a top view of a color film substrate of the display panel shown in fig. 1;
fig. 4 is a schematic structural diagram of a first electrode according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another first electrode according to an embodiment of the present invention;
FIG. 6 is an enlarged, partial top view of a first electrode according to an embodiment of the present invention;
FIG. 7 is a cut view in the PP' direction of FIG. 6;
FIG. 8 is a top view of a portion of yet another first electrode provided in accordance with an embodiment of the present invention;
FIG. 9 is a partial top view of yet another first electrode provided in accordance with an embodiment of the present invention;
FIG. 10 is a top view of a portion of yet another first electrode provided in accordance with an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
FIG. 12 is a timing diagram of a driving method according to an embodiment of the present invention;
fig. 13 is another timing diagram of the driving method according to the embodiment of the invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the existing display panel, in order to implement the pressure detection function, one way is to add a pressure sensor directly in the display panel, which may greatly increase the thickness of the display panel and the manufacturing cost.
Another method is to add two layers of pressure detection electrodes in the display panel, and realize pressure detection through pressure detection capacitance change between the pressure detection electrodes. In this implementation, the pressure detection electrodes are all ITO transparent surface electrodes. However, in order to ensure good light transmittance, the ITO transparent surface electrode has a small thickness, which causes a large resistance of the pressure detection electrode, and affects the accuracy of pressure detection.
In order to solve the above problem, an embodiment of the present invention provides a display panel, including:
a liquid crystal layer;
the color film substrate is positioned on one side of the liquid crystal layer and comprises a first substrate and a first electrode layer arranged on the first substrate; the first electrode layer comprises a plurality of first electrodes which are arranged in parallel;
the array substrate is positioned on the other side of the liquid crystal layer and comprises a second substrate and a common electrode layer arranged on the second substrate; the common electrode layer comprises a plurality of second electrodes which are arranged in parallel, and the extending direction of the second electrodes is vertical to the extending direction of the first electrodes; each second electrode is provided with a plurality of hollow areas;
the pressure detection electrode is arranged in the hollow area; the pressure detection electrodes correspond to the hollow areas one by one;
the first electrode and the second electrode are used for touch detection in a touch detection time period; in the pressure detection time period, the first electrode and the pressure detection electrode are used for pressure detection; the first electrode is a strip electrode formed by metal wire grids.
Therefore, in the embodiment of the invention, the pressure detection is realized through the first electrode and the pressure detection electrode, and the part of the common electrode layer is reused as the pressure detection electrode so as to realize the pressure detection, thereby reducing the thickness of the display panel and the manufacturing cost. Meanwhile, the first electrode on the color film substrate is a strip electrode formed by metal wire grids. Through the pattern structure who sets up the metal mesh, can make the metal mesh invisible, need not to adopt transparent ITO face electrode, can adopt the electric conductivity to be greater than the first electrode of the opaque metal material preparation of ITO, for traditional ITO face electrode, reduce the resistance of first electrode, increase pressure detection's sensitivity.
In order to make the technical solutions provided by the embodiments of the present invention clearer, the above solutions are described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to fig. 3, fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, fig. 2 is a top view of an array substrate of the display panel shown in fig. 1, and fig. 3 is a top view of a color filter substrate of the display panel shown in fig. 1.
The display panel includes: a liquid crystal layer; the color film substrate 11 is located on one side of the liquid crystal layer, and the color film substrate 11 comprises a first substrate 111 and a first electrode layer arranged on the first substrate 111; the first electrode layer includes a plurality of first electrodes 112 arranged in parallel; an array substrate 12 positioned at the other side of the liquid crystal layer, the array substrate 12 including a second substrate 121 and a common electrode layer disposed on the second substrate 121; the common electrode layer includes a plurality of second electrodes 122 arranged in parallel, and the extending direction of the second electrodes 122 is perpendicular to the extending direction of the first electrodes 112; each second electrode 122 is provided with a plurality of hollow-out regions 123; a pressure detection electrode 124 disposed within the hollowed-out area 123; the pressure detection electrodes 124 correspond to the hollow areas 123 one to one.
In the touch detection time period, the first electrode 112 and the second electrode 122 are used for touch detection; in the pressure detection time period, the first electrode 112 and the pressure detection electrode 124 are used for pressure detection; the first electrode 112 is a stripe electrode formed by a metal wire grid.
For pressure detection, the first electrode 112 is one electrode of a pressure detection capacitor, and the pressure detection electrode 124 is the other electrode of the pressure detection capacitor. After the display panel receives pressure, the distance between the two electrodes of the pressure detection capacitor is changed, so that the pressure detection capacitor is changed, the pressure can be calculated according to the variation of the pressure detection capacitor, and pressure detection is realized.
The common electrode layer and the pressure detection electrode 124 may be prepared from the same ITO layer. In this embodiment, the display panel detects pressure through the first electrode 112 and the pressure detection electrode 124. The pressure detection electrode 124 and the common electrode layer are made of the same conductive layer, that is, the portion of the common electrode layer is reused as the pressure detection electrode 124, so that pressure detection is realized, and the thickness and the manufacturing cost of the display panel are reduced. Meanwhile, the first electrode 112 located on the color film substrate is a strip electrode formed by metal wire grids, the metal grids can be invisible through the arrangement of the pattern structure of the metal grids, a transparent ITO surface electrode is not needed, the first electrode can be made of an opaque metal material with the conductivity larger than that of ITO, and compared with a traditional ITO surface electrode, the resistance of the first electrode is reduced, and the sensitivity of pressure detection is improved.
Note that, for convenience of illustration, the liquid crystal layer is not shown in fig. 1. The display panel further includes: a bonding region 13 disposed at one end of the first substrate 111; and a control chip 14 disposed at one end of the second substrate 121. The first electrode 112 is connected to a pin of the bonding region 13 through a wire. The second electrode 122 and the pressure detection electrode 124 are respectively connected to corresponding pins of the control chip 14 through corresponding leads. The pins of the bonding area 13 are connected with the control chip through the FPC 15.
In the touch detection time period, the control chip 14 is configured to input a touch scanning signal to the second electrode 122, input the same touch scanning signal as the second electrode 122 or input a common voltage signal to the pressure detection electrode 124, and the first electrode 112 is used as an output end of the touch detection; the control chip 124 performs touch detection according to the touch detection signal output by the first electrode 112; in the pressure detection time period, the control chip 14 is configured to input a pressure detection signal to the pressure detection electrode 124 and receive a pressure sensing signal output from the pressure detection electrode 124, input a common voltage signal to the second electrode 122, and input a fixed dc voltage signal to the first electrode 112; the control chip 14 performs pressure detection according to the pressure sensing signal.
To facilitate the layout of the leads of the first electrode 112, the leads of the second electrode 122, and the pressure detection electrode 124, the control chip is disposed at one end of the second electrode 122 in the extending direction, and the bonding region 13 and the control chip 14 are disposed at least partially opposite to each other in the direction perpendicular to the first substrate 11. The extending direction of the binding region 13 is parallel to the extending direction of the first electrode 112. In this way, the second electrode 122 may be directly electrically connected to the control chip 14 through a separate wire. The pressure detection electrode 124 is electrically connected to the corresponding lead through the via hole, and is further electrically connected to the control chip 14. The lead of the pressure detection electrode 124 is different from the lead of the first electrode 112. As shown in fig. 1, in the embodiment, the binding region 13 and the control chip can be located at the same end of the display panel, so that the width of the left and right frame regions of the display panel is reduced, and the narrow frame design of the display panel is facilitated.
In the embodiment of the present invention, the number of the first electrodes 112, the number of the second electrodes 122, and the number of the touch detection electrodes 124 are not particularly limited, and may be set according to the size and the detection precision of the display panel, including but not limited to the embodiment shown in fig. 1.
In the present embodiment, the pressure detection electrodes 124 are arranged in an array. In the embodiment shown in fig. 1, the first electrodes 112 extend in a direction parallel to the row direction X of the array, and the second electrodes 122 extend in a direction parallel to the column direction Y of the array. A column of pressure sensing electrodes 124 is located within the same second electrode 122. At this time, a row of the pressure detection electrodes 124 is disposed opposite to one first electrode 112 in a direction perpendicular to the first substrate 11. In the direction perpendicular to the first substrate 11, the projections of the pressure detection electrodes 124 in the first electrode layer are both located in the first electrode 112; the projections of the same row of pressure sensing clicks 124 within the first electrode layer are located within the same first electrode 112; the projections of the pressure detecting clicks 124 of different rows within the first electrode layer are located within different first electrodes 112.
In other embodiments, a row of pressure detection electrodes 124 may be disposed opposite to one first electrode 112 in a direction perpendicular to the first substrate 11. At this time, the extending direction of the first electrode 112 is parallel to the column direction Y, and the extending direction of the second electrode 122 is parallel to the row direction X. A row of pressure sensing electrodes 124 is located within the same second electrode 122. In the direction perpendicular to the first substrate 11, the projections of the pressure detection electrodes 124 in the first electrode layer are both located in the first electrode 112; the projections of the pressure sensing clicks 124 of the same column in the first electrode layer are located in the same first electrode 112; the projections of the pressure detecting clicks 124 of different columns within the first electrode layer are located within different first electrodes 112.
As described above, the first electrode 112 is a stripe electrode formed by a metal wire grid. The structure of the first electrode 112 can be as shown in fig. 4, where fig. 4 is a schematic structural diagram of a first electrode according to an embodiment of the present invention, and the strip-shaped electrodes of the first electrode 112 include: a plurality of first wires 41 arranged in parallel and a plurality of second wires 42 arranged in parallel; the first wires and the second wires are connected in a cross mode to form grid units. In the embodiment shown in fig. 4, the first trace 41 and the second trace 42 are both straight lines and perpendicular to each other, and have a rectangular grid unit 43.
Fig. 5 shows a strip-shaped electrode of the first electrode 112, where fig. 5 is a schematic structural diagram of another first electrode provided in an embodiment of the present invention, and the implementation shown in fig. 5 is different from the implementation shown in fig. 4 in that the first trace 41 and the second trace 42 are not perpendicular to each other, and intersect to form a grid unit 43 in a parallelogram shape. Alternatively, the grid cells 43 may be a diamond grid.
In other embodiments, the first trace 41 and the second trace 42 are not limited to a straight line structure, and may be a smooth curve or a polygonal line.
Referring to fig. 6 and 7, fig. 6 is a partially enlarged top view of a first electrode according to an embodiment of the present invention, and fig. 7 is a sectional view of fig. 6 in a direction PP'. Fig. 7 is a cross-sectional view perpendicular to the extending direction of the first trace 41. At this time, the first trace 41 is perpendicular to the second trace 42, and the two are crossed to form a rectangular grid unit 43.
A first electrode layer is disposed on one side of the first substrate 111, and a color film layer 61 and a black matrix layer 62 are disposed on the other side of the substrate 111. The black matrix layer 62 is provided with a plurality of pixel openings 63 arranged in an array. The color film layer 61 includes a plurality of pixel color film units 64 corresponding to the pixel openings 63 one by one.
In a direction Z perpendicular to the first substrate 11, a projection of the first trace 41 on the first substrate 111 and a projection of the second trace 42 on the first substrate 111 are not overlapped with a projection of the pixel opening 63 on the first substrate.
It should be noted that only the first routing line 41, the second routing line 42, the grid unit 43 and the pixel opening 63 are shown in fig. 6, and other structures shown in fig. 7 are not shown. The pixel color film unit 64 includes: the pixel color filter comprises an R pixel color filter unit, a G pixel color filter unit and a B pixel color filter unit. The arrangement includes, but is not limited to, the arrangement shown in fig. 6.
In the embodiment shown in fig. 7, the top view of the first electrode can be as shown in fig. 4, and the first trace 41 and the second trace 42 intersect to form a rectangular grid unit 43. The black matrix layer 62 shields the first trace 41 and the second trace 4242 from visibility. At this time, the extending direction of the first trace 41 is parallel to the row of pixel openings 63; the second trace 42 is parallel to the column of pixel openings 63. In other embodiments, the extending direction of the first trace 41 may be parallel to the pixel openings 63 in one column; the second routing line 42 is parallel to a row of pixel openings 63.
As described above, in the embodiment shown in fig. 6 and 7, two adjacent first traces 41 and two adjacent second traces 42 intersect to form a rectangular grid unit 43. In a direction Z perpendicular to the first substrate 111, a projection of the grid unit 43 on the first substrate 111 at least overlaps a projection of the pixel color film unit 64 on the first substrate 111.
The grid unit 43 may cover at least one pixel color film unit 64 in the extending direction of the first trace 41, and may cover at least one pixel color film unit 64 in the extending direction of the second trace 42, which is not limited to the embodiment shown in fig. 6.
In the embodiment shown in fig. 6 and 7, in the direction X, the first trace 41 and the second trace 42 of the first electrode are shielded from light by the black matrix layer 62 and are not visible, so that the problem of the first electrode pattern being visible under heavy load and a specific screen can be avoided. In the direction Z, the cell 43 of each grid corresponds to at least one pixel color film cell 64. Optionally, each grid unit 43 may be arranged to correspond to a plurality of pixel color film units 64 in the direction Z.
Referring to fig. 8, fig. 8 is a partial top view of another first electrode according to an embodiment of the present invention. In fig. 8, the extending direction of the first trace 41 is not parallel to a row of color filter units 64 and is not parallel to a row of color filter units 64; the extending direction of the second routing line 42 is not parallel to a row of color filter units 64 and not parallel to a row of color filter units 64. The two adjacent first routing lines 41 and the two adjacent second routing lines 42 intersect to form a rectangular, parallelogram or rhombic grid unit. In the cross-sectional view of the first electrode shown in fig. 8, the hierarchical structures of the array substrate, the first electrode, the color film layer and the black matrix layer are the same as the hierarchical structure of the embodiment shown in fig. 6, except that the grid structure formed by the first routing lines 41 and the second routing lines 42 in the first electrode layer is different.
Meanwhile, in the embodiment shown in fig. 8, the row direction or the column direction of the first trace 41 and the pixel color film unit 64 is not in parallel, and the extending direction of the second trace 42 is not in parallel with the row direction or the column direction of the pixel color film unit 64, so that the first trace 41 and the second trace 42 cannot be completely shielded by the black matrix layer. Compared with the embodiment shown in fig. 6, the first trace 41 and the second trace 42 with smaller widths can be disposed, and under the condition that the first trace 41 and the second trace 42 are sufficiently thin, the first trace 41 and the second trace 42 are not visible when the display panel displays through the diffraction effect of light, so as to ensure the display effect.
In order to make the first trace 41 and the second trace 42 thin enough to achieve a better diffraction effect of light, the width of the first trace 41 and the second trace 42 is set to be in a range of 2.5 μm to 10 μm, inclusive.
Referring to fig. 9, fig. 9 is a partial top view of another first electrode according to an embodiment of the present invention, the first electrode 112 includes: a first region 112b facing the pressure detection electrode in a direction perpendicular to the first substrate; and a second region 112a outside the first region 112 b. The density of the mesh cells 43 in the first region 112b is greater than the density of the mesh cells 43 in the second region 112a in the direction perpendicular to the first substrate.
In the embodiment shown in fig. 9, the extending direction of the first traces is parallel to the row direction X of the pressure detection electrodes, and the extending direction of the second traces is perpendicular to the column direction Y of the pressure detection electrodes. The direction perpendicular to the first substrate is perpendicular to the column direction Y and perpendicular to the row direction X.
In the embodiment of the present invention, the pressure detection is realized by the pressure detection capacitor formed by the first electrode 112 and the pressure detection electrode. The density of the grid unit 43 of the first area 112b is set to be greater than the density of the grid unit 43 of the second area 112a, so that the area occupied by the first wire and the second wire in the first area 112b can be increased, the dead area of the pressure detection capacitor is further increased, the pressure detection capacitor is further improved, and the sensitivity of pressure detection is improved.
Fig. 9 illustrates an example where the grid cells 43 corresponding to the first area 112b and the second area 112a are rectangles, in another embodiment, the grid cells 43 corresponding to the first area 112b and the second area 112a are also parallelograms, as shown in fig. 10, fig. 10 is a top view of a part of another first electrode provided in an embodiment of the present invention, in this embodiment, the grid cells 43 corresponding to the first area 112b and the second area 112a are rectangles having a parallelogram shape, and at this time, the first trace and the second trace are not perpendicular. Different shapes of the grid cells can be realized by designing the layout of the first wire and the second wire.
As described above, in order to reduce the width of the left and right frames, the control chip is disposed at one end of the second electrode in the extending direction. The second electrode is perpendicular to the first electrode. The first electrode needs to be connected with the binding area through wiring and then connected with the control chip through the FPC. Thus, the longer the first electrode is away from the control chip, the longer the corresponding trace length is, and the higher the impedance is. In order to enable different first electrodes to have the same impedance, the grid density of the second area in each first electrode is set to be the same, the first electrode with the larger distance from the control chip is set, and the density of grid units in the first area is larger, so that the impedance difference of different first electrodes is reduced, and the touch detection precision is improved. In the embodiment of the invention, the layout of the first area and the second area is set to be different for the same first electrode, so as to avoid the problem of moire fringes. Setting the grid units in the second area to be rectangular, enabling the first routing and the second routing of the rectangular grid units not to be overlapped with the pixel color film unit, and hiding the first routing and the second routing in the second area through the black matrix layer; and setting the grid units in the first area to be rhombic, wherein the first routing line and the second routing line are not perpendicular to each other at the moment, and the first routing line and the second routing line are overlapped with the pixel color film unit in the direction perpendicular to the first substrate. Thus, the problem of moire can be effectively avoided. In the same first electrode, a third area can be arranged between the first area and the second area, and the density of the grid units in the third area is set to be between the density of the grid units in the first area and the density of the grid units in the second area, so that the density of the grid units in the same first electrode is changed smoothly, and the display quality is ensured.
As can be seen from the above description, in the embodiment of the present invention, the display panel locates the pressure detection electrode and the common electrode layer in the same layer, a part of the common electrode layer can be reused as the pressure detection electrode, and the common electrode layer and the pressure detection electrode are made of the same ITO layer, so as to implement pressure detection, and reduce the thickness of the display panel and the manufacturing cost. Meanwhile, the first electrode on the color film substrate is a strip electrode formed by metal wire grids. The metal grid can be invisible by arranging the pattern structure of the metal grid, so that the first electrode can be prepared by adopting a metal material with the conductivity larger than that of ITO (indium tin oxide), the resistance of the first electrode is reduced, and the sensitivity of pressure detection is increased.
Another embodiment of the present invention further provides an electronic device, where fig. 11 is shown as an example, and fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, where the electronic device includes a display panel 110, and the display panel is the display panel according to the embodiment.
The electronic equipment can be mobile phones, tablet computers, televisions and other electronic equipment with a display function. The electronic equipment adopts the display panel in the embodiment, the pressure detection is realized by multiplexing the part of the common electrode layer, and the manufacturing cost and the thickness are lower. Meanwhile, the pressure detection device has extremely high pressure detection sensitivity.
Another embodiment of the present invention further provides a driving method for a display panel in the above embodiments, the driving method including:
inputting a common voltage signal to the second electrode and the pressure detection electrode in a display time period to perform display driving;
in a touch detection time period, sequentially inputting touch scanning signals to the second electrode according to a first preset scanning sequence, inputting the same touch scanning signals as the second electrode or inputting a common voltage signal to the pressure detection electrode, and performing touch detection according to the touch detection signals at the output end of the first electrode;
and in the pressure detection time period, inputting a pressure detection signal to the pressure detection electrode according to a second preset scanning sequence, inputting a common voltage signal to the second electrode, inputting a fixed direct current voltage signal to the first electrode, and performing pressure detection according to a pressure induction signal output by the pressure detection electrode.
Fig. 12 shows a timing chart of the driving method, and fig. 12 is a timing chart of the driving method according to the embodiment of the invention. The display panel is set to have N second electrodes, and when the second electrodes are scanned one by one, scanning signals of the N second electrodes are TX1, TX2, … and TXN in sequence. The signal of the first electrode is RX.
In the timing chart shown in fig. 12, in the driving period of one frame picture: the display period has a plurality of sub-display periods, and the sub-display periods are not adjacent to each other. In each sub-display period, the second electrodes serve as common electrodes for image display, and all the second electrodes input a common voltage signal. The signal RX of the first electrodes is GND, i.e. all the first electrodes are grounded, so as to avoid affecting the image display effect. All the pressure detection electrodes input signals as common voltage signals, and the common electrodes are used for image display. Alternatively, the low level of each waveform in fig. 12 is a common voltage.
The touch detection time period is provided with a plurality of sub-touch detection time periods corresponding to a first preset scanning sequence; the sub-touch detection time periods are not adjacent. In each sub-touch detection time period, the first electrode and the second electrode are used for touch position detection. Scanning signals (such as square wave pulse signals input by the first electrodes in fig. 12) are sequentially input to the first electrodes according to a first preset scanning sequence. And receiving a touch detection signal output by the first electrode in each sub-touch detection time period to perform touch detection. In fig. 12, in the sub-touch detection period, the common voltage signal input for each pressure detection electrode is a constant dc voltage.
And the sub-display time periods and the sub-touch detection time periods are alternately distributed.
The pressure detection period has 1 pressure period or a plurality of adjacent sub-pressure periods. As shown in fig. 12, the pressure detection time period has 1 pressure time period, and provides a pressure detection signal (for example, a square wave pulse signal input by the pressure detection electrode in fig. 12) for each pressure detection electrode, at this time, signals input by the first electrode and the second electrode are both direct current constant voltages, and may be both common voltage signals. At this time, the second preset scanning order may scan all the pressure detection electrodes simultaneously.
Fig. 13 is another timing diagram of the driving method according to the embodiment of the present invention, and in the timing diagram of fig. 13, similarly, in a driving period of one frame of picture: the display period has a plurality of sub-display periods, and the sub-display periods are not adjacent to each other. In each sub-display period, the second electrodes serve as common electrodes for image display, and all the second electrodes input a common voltage signal. The signal RX of the first electrodes is GND, i.e. all the first electrodes are grounded, so as to avoid affecting the image display effect. All the pressure detection electrodes input signals as common voltage signals, and the common electrodes are used for image display. Alternatively, the low level of each waveform in fig. 12 is a common voltage.
The touch detection time period is provided with a plurality of sub-touch detection time periods corresponding to a first preset scanning sequence; the sub-touch detection time periods are not adjacent. In each sub-touch detection time period, the first electrode and the second electrode are used for touch position detection. And sequentially inputting scanning signals to the first electrodes according to a first preset scanning sequence. And receiving a touch detection signal output by the first electrode in each sub-touch detection time period to perform touch detection. In fig. 13, in the sub-touch detection period, the common voltage signal input for each pressure detection electrode is a constant dc voltage.
The pressure detection period has a plurality of sub-pressure detection periods corresponding to a second preset scanning order; the sub-pressure detection periods are not adjacent to each other. At this time, the second preset scanning order is to scan each pressure detection electrode one by one, or scan each pressure detection electrode row by row, or scan each pressure detection electrode column by column. In the sub-pressure detection time period, a square wave pulse signal is provided for the pressure detection electrode in a scanning state, the second electrode input signal RX is GND, and the first electrode input signals are all common voltage signals. And carrying out pressure detection according to the signal output by the pressure detection electrode, namely realizing pressure detection by self-emitting and self-receiving of the second electrode in a scanning state.
Wherein the driving period comprises a plurality of sub-periods; each sub-period has a sub-display time period, a sub-touch detection time period, and a sub-pressure detection time period.
It should be noted that, in the embodiment of the present invention, the scanning order of each electrode includes, but is not limited to, the scanning order shown in fig. 12 and fig. 13.
As can be seen from the above description, the driving method provided in the embodiment of the present invention can implement pressure detection, display driving, and touch detection by multiplexing the pressure detection electrodes located in the common electrode layer, and does not need to separately add a pressure sensor, so that the cost is low, and the driving method is simple.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A display panel, comprising:
a liquid crystal layer;
the color film substrate is positioned on one side of the liquid crystal layer and comprises a first substrate and a first electrode layer arranged on the first substrate; the first electrode layer comprises a plurality of first electrodes which are arranged in parallel;
the array substrate is positioned on the other side of the liquid crystal layer and comprises a second substrate and a common electrode layer arranged on the second substrate; the common electrode layer comprises a plurality of second electrodes which are arranged in parallel, and the extending direction of the second electrodes is perpendicular to the extending direction of the first electrodes; each second electrode is provided with a plurality of hollow areas;
the pressure detection electrode is arranged in the hollow area; the pressure detection electrodes correspond to the hollow areas one by one;
the first electrode and the second electrode are used for touch detection in a touch detection time period; in the pressure detection time period, the first electrode and the pressure detection electrode are used for pressure detection; the first electrode is a strip electrode formed by metal wire grids; the strip-shaped electrode includes: the circuit comprises a plurality of first wires arranged in parallel and a plurality of second wires arranged in parallel, wherein the first wires and the second wires are connected in a cross mode to form grid units; the first electrode includes: a first region facing the pressure detection electrode in a direction perpendicular to the first substrate, and a second region outside the first region, wherein a density of the mesh cells in the first region is greater than a density of the mesh cells in the second region.
2. The display panel according to claim 1, wherein the pressure detection electrodes are arranged in an array;
in a direction perpendicular to the first substrate, a row of the pressure detection electrodes is disposed opposite to one of the first electrodes, or a column of the pressure detection electrodes is disposed opposite to one of the first electrodes;
in a direction perpendicular to the first substrate, projections of the pressure detection electrodes in the first electrode layer are located in the first electrode.
3. The display panel according to claim 1, wherein one side of the first substrate is provided with the first electrode layer;
the other side of the first substrate is also provided with a color film layer and a black matrix layer;
the black matrix layer is provided with a plurality of pixel openings which are arranged in an array;
the color film layer comprises a plurality of pixel color film units which are in one-to-one correspondence with the pixel openings;
in a direction perpendicular to the first substrate, a projection of the first trace on the first substrate and a projection of the second trace on the first substrate are not overlapped with a projection of the pixel opening on the first substrate.
4. The display panel according to claim 3, wherein the extending direction of the first wire is parallel to a row of the pixel openings; the second routing lines are parallel to the pixel openings in one row;
or the extending direction of the first routing line is parallel to the pixel openings in a row; the second routing line is parallel to the pixel openings in one row.
5. The display panel according to claim 4, wherein two adjacent first traces and two adjacent second traces intersect to form a rectangular grid unit, and in a direction perpendicular to the first substrate, a projection of the grid unit on the first substrate covers at least a projection of one pixel color filter unit on the first substrate.
6. The display panel according to claim 3, wherein an extending direction of the first trace is not parallel to a row of the pixel color film units and is not parallel to a row of the pixel color film units;
the extending direction of the second routing is not parallel to the rows of the pixel color film units and not parallel to the rows of the pixel color film units;
the two adjacent first wires and the two adjacent second wires are crossed to form a rectangular, parallelogram or rhombic grid unit.
7. The display panel according to claim 6, wherein the first wire and the second wire have a width in a range of 2.5 μm to 10 μm, inclusive.
8. The display panel according to claim 1, wherein the second electrode and the pressure detection electrode are formed of the same layer of ITO.
9. The display panel according to claim 1, further comprising: a control chip;
in a touch detection time period, the control chip is configured to input a touch scanning signal to the second electrode, input the same touch scanning signal as the second electrode or input a common voltage signal to the pressure detection electrode, and the first electrode is used as an output end of touch detection; the control chip performs touch detection according to the touch detection signal output by the first electrode;
in a pressure detection time period, the control chip is used for inputting a pressure detection signal to the pressure detection electrode and receiving a pressure induction signal output by the pressure detection electrode, inputting the common voltage signal to the second electrode, and inputting a fixed direct-current voltage signal to the first electrode; and the control chip performs pressure detection according to the pressure sensing signal.
10. An electronic device, comprising: the display panel of any one of claims 1-9.
11. A driving method for a display panel according to any one of claims 1 to 9, the driving method comprising:
inputting a common voltage signal to the second electrode and the pressure detection electrode in a display time period to perform display driving;
sequentially inputting touch scanning signals to a second electrode according to a first preset scanning sequence in a touch detection time period, inputting the same touch scanning signals as the second electrode or inputting a common voltage signal to the pressure detection electrode, and performing touch detection according to a touch detection signal at the output end of the first electrode;
in a pressure detection time period, inputting a pressure detection signal to the pressure detection electrode according to a second preset scanning sequence, inputting the common voltage signal to the second electrode, inputting a fixed direct current voltage signal to the first electrode, and performing pressure detection according to a pressure induction signal output by the pressure detection electrode;
in a display time period, the second electrodes are used as common electrodes for displaying images, common voltage signals are input into all the second electrodes, and the first electrodes are grounded; the first electrode is a strip electrode formed by metal wire grids; the strip-shaped electrode includes: the circuit comprises a plurality of first wires arranged in parallel and a plurality of second wires arranged in parallel, wherein the first wires and the second wires are connected in a cross mode to form grid units; the first electrode includes: a first region facing the pressure detection electrode in a direction perpendicular to the first substrate, and a second region outside the first region, wherein a density of the mesh cells in the first region is greater than a density of the mesh cells in the second region.
12. The driving method according to claim 11, wherein in a driving period of one frame of picture:
the display time period is provided with a plurality of sub-display time periods which are not adjacent;
the touch detection time period is provided with a plurality of sub-touch detection time periods corresponding to the first preset scanning sequence; the sub-touch detection time periods are not adjacent;
the pressure detection period has 1 pressure period or a plurality of adjacent sub-pressure periods;
wherein the sub-display time periods and the sub-touch detection time periods are alternately distributed.
13. The driving method according to claim 11, wherein in a driving period of one frame of picture:
the display time period is provided with a plurality of sub-display time periods which are not adjacent;
the touch detection time period is provided with a plurality of sub-touch detection time periods corresponding to the first preset scanning sequence; the sub-touch detection time periods are not adjacent;
the pressure detection period has a plurality of sub-pressure detection periods corresponding to the second preset scanning order; the sub-pressure detection time periods are not adjacent;
wherein the driving period comprises a plurality of sub-periods; each sub-period has one sub-display period, one sub-touch detection period, and one sub-pressure detection period.
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| US11853508B2 (en) | 2021-02-25 | 2023-12-26 | Huizhou China Star Optoelectronics Display Co., Ltd. | Touch panel and touch device |
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| CN108153445B (en) | 2017-11-30 | 2020-07-31 | 云谷（固安）科技有限公司 | Touch display panel and touch display device |
| CN111158533B (en) * | 2019-11-28 | 2024-04-23 | 京东方科技集团股份有限公司 | Detection substrate and display device |
| CN111179768A (en) * | 2019-12-18 | 2020-05-19 | 京东方科技集团股份有限公司 | Display panel, display device and electronic equipment |
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