CN103594025A - Flexible display - Google Patents

Abstract

The invention discloses a flexible display, which comprises a display layer, a thin film transistor layer and a flexible substrate. The display layer has a plurality of display elements. The thin film transistor layer is provided with a plurality of pixel control circuits and a plurality of sensing circuits. The pixel control circuits are used for controlling the display elements. Each sensing circuit is used for providing a deformation signal according to the deformation of the flexible display. The flexible substrate and the thin film transistor layer are stacked.

Description

Flexible display

Technical field

The present invention relates to a kind of flexible display, particularly relate to the flexible display of a kind of tool sensing self curvature function.

Background technology

Word or the picture of browing record on paper is the most familiar reading methods of the mankind, and along with the progress of printing technology and the reduction of printing cost, paper is at the record and the transmission medium that are closely used in large quantities for hundreds of years as data.Yet along with the progress of display technique, paper is very likely replaced by flexible display in the near future gradually.Flexible display, due to the characteristic such as have compact, the deflection of similar paper and be easy to carry, therefore can be expected ground will be used for realizing Electronic Paper (Electronic Pa _pand replace paper and become the record of data and transmit medium er) or the application of e-book.

Yet, in previous flexible display technology, the method that shortage can accurately be estimated the curvature of flexible display, and limited the application of flexible display.For example, when flexible display is during because of external force distortion, its shown picture correspondingly can torsional deformation, yet because cannot correctly estimating the curvature of flexible display, therefore cannot proofread and correct the picture of torsional deformation exactly.

Summary of the invention

The object of the present invention is to provide a kind of flexible display, the variable-resistance change in resistance of a plurality of sensing cells by sensing flexible display, can accurately try to achieve at least one curvature (curvature) of flexible display.

For reaching above-mentioned purpose, the invention provides a kind of flexible display.Flexible display comprises display layer, tft layer and bendable substrate.Display layer has a plurality of display elements.Tft layer has a plurality of pixel control circuits and a plurality of sensing circuit.Above-mentioned a plurality of pixel control circuit is in order to control above-mentioned a plurality of display element.Each sensing circuit provides deformation signal in order to the deformation according to flexible display.The stacking setting of bendable substrate and tft layer.

Each sensing circuit of flexible display of the present invention provides deformation signal in order to the deformation according to flexible display, therefore can be according to the deformation of above-mentioned deformation signal judgement flexible display, the operation of according to the deformation of flexible display, flexible display being correlated with again, for example: the feedback of adjustment of image, user's action ... Deng.In addition, above-mentioned a plurality of pixel control circuits and a plurality of sensing circuit are formed on the tft layer of flexible display, and can simplify the manufacture craft of flexible display.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the flexible display of one embodiment of the invention;

Fig. 2 is the functional block diagram of the flexible display of Fig. 1;

Fig. 3 is the schematic diagram of tft layer of the flexible display of Fig. 1;

Fig. 4 is the schematic diagram of partial circuit of the flexible display of Fig. 2;

Fig. 5 is the sequential chart of voltage signal of the multi-strip scanning line of Fig. 4;

Fig. 6 is variable resistor and the equivalent circuit diagram of the first resistance when its corresponding the first transistor conducting of Fig. 4;

Fig. 7 is variable resistor, the first resistance, the second resistance and the 3rd resistance of Fig. 4 equivalent circuit diagram when its corresponding the first transistor conducting;

Fig. 8 is the wiring diagram of first sensing cell of one embodiment of the invention;

Fig. 9 is the wiring diagram of second sensing cell of one embodiment of the invention;

Figure 10 is the wiring diagram of the 3rd sensing cell of one embodiment of the invention;

Figure 11 is in order to illustrate the distribution mode of a plurality of sensing cells of the flexible display of one embodiment of the invention;

Figure 12 utilizes interpolation method to push away to obtain how much of the curves of flexible display in order to illustrate in one embodiment of the invention;

Figure 13 is in order to illustrate the distribution mode of a plurality of sensing cells of the flexible display of another embodiment of the present invention;

Figure 14 has illustrated the corresponding curvature vector of each sensing cell of Figure 13;

Figure 15 is the three-dimensional stereo model of the flexible display of Figure 13;

Figure 16 adjusts display frame in order to the flexible display of key diagram 1 according to the curvature of trying to achieve;

Figure 17 to Figure 19 is respectively the region cut-open view of the flexible display of one embodiment of the invention.

Symbol description

100,900,1100 flexible displays

103 virtual planes

105 patterns

106 rectangle patterns

107 visual angles

110 bendable substrates

112 pixels

114 pixel control circuits

120 sweep circuits

130 treatment circuits

150 sensing circuits

160,160A, 160B, 160C sensing cell

162 stress sensors

170 tft layers

180 display layers

182 display elements

610,620,630 regions

660 first sections

661 first serial connection sections

670 second sections

671 second serial connection sections

680 the 3rd sections

681 the 3rd serial connection sections

1200 curvature vectors

1300 three-dimensional stereo models

1510 cushions

1520 polysilicon layers

1530 protective seams

1540 gate insulators

1550 metal levels

1560 protective seams

1570 anode layers

1580 Organic Light Emitting Diode layers

1590 cathode layers

A, A ' line

two ends

B, B ' line

two ends

D first end; Drain electrode

G control end; Grid

K ₁, K ₂, K ₃, K ₄curvature

O1 first signal line

O2 secondary signal line

Q1 the first transistor

Q2 transistor seconds

R1 the first resistance

R2 the second resistance

R3 the 3rd resistance

Rv variable resistor

S ₁to S _nsweep trace

S _c1to S _cn, S _cxdeformation signal

S the second end; Source electrode

Vdd second system voltage

Vss the first system voltage

Vs sweep signal

V1, V2 voltage

Δ V voltage difference

W third direction

X first direction

(X ₁, Z ₁), (X ₂, Z ₂), (X ₃, Z ₃), (X ₄, Z ₄) coordinate

Y second direction

Z fourth direction

θ ₂angle

Embodiment

Please refer to Fig. 1 and Fig. 2.Fig. 1 is the schematic diagram of the flexible display (flexible display) 100 of one embodiment of the invention, and Fig. 2 is the functional block diagram of Fig. 1 flexible display 100.Flexible display 100 comprises bendable substrate 110, thin film transistor (TFT) (Thin-Film Transistor, TFT) layer 170 and display layer 180.Display layer 180 has a plurality of display elements 182, and display element 182 can be Organic Light Emitting Diode or liquid crystal, but the present invention is not as limit.Tft layer 170 has a plurality of pixel control circuits 114 and a plurality of sensing circuit 150.Pixel control circuit 114 is in order to control a plurality of display elements 182 of display layer 180.150 of each sensing circuits are in order to provide deformation signal S according to the deformation of flexible display 100 _c1to S _cn.Wherein, because a plurality of pixel control circuits 114 and a plurality of sensing circuit 150 are all formed on tft layer 170, therefore a plurality of pixel control circuits 114 and a plurality of sensing circuit 150 can side by side be formed in tft layer 170 by identical manufacture craft, also therefore can simplify the manufacture craft of flexible display 100.In addition bendable substrate 110 and the stacking setting of tft layer 170.Bendable substrate 110 has the not breakable flexible base plate (as: pi (polyimide of impact resistance, PI), polycarbonate (polycarbonate, PC), polyethersulfone (polyethersulfone, PES), poly-field ice alkene (polynorbornene, PNB), the sub-acid amides (polyetherimide of polyethers, PEI), PPTA (poly (p-phenylene terephthalamide) or thinning glass etc.), and can be scratched by curved.

Each pixel control circuit 114 and a display element 182 can form a pixel.Please refer to Fig. 2 and Fig. 3, the schematic diagram of the tft layer 170 of the flexible display 100 that Fig. 3 is Fig. 1.Wherein, each the pixel control circuit 114 in tft layer 170 can form a pixel 112 with a display element 182 in display layer 180.Must understand ground, plain control circuit 114 is formed at tft layer 170, and display element 182 is to be formed at display layer 180, therefore the pixel 112 in Fig. 3 is with dotted line but not represents with solid line.A plurality of pixels 112 are arranged in the mode of matrix, and with the stacking setting of bendable substrate 100, in order to display frame.The pixel control circuit 114 of each pixel 112 is in order to control the renewal operation of the pixel data of pixel 112.

Please refer to Fig. 2 and Fig. 4, the schematic diagram of the partial circuit of the flexible display 100 that Fig. 4 is Fig. 2.Each sensing circuit 150 comprises first signal line O1, the first resistance R 1 and a plurality of sensing cell 160.The first resistance R 1 is electrically coupled between first signal line O1 and the first system voltage Vss, and above-mentioned a plurality of sensing cell 160 is electrically coupled between first signal line O1 and second system voltage Vdd, and sensing circuit 150 provides deformation signal S by first signal line O1 _c1to S _cn.Above-mentioned the first system voltage Vss can be ground voltage, and second system voltage Vdd can be positive voltage.Each sensing cell 160 has the first transistor Q1 and stress sensor 162, the first transistor Q1 electric property coupling stress sensor 162.Stress sensor 162 is in order to sensing suffered stress of flexible display 100 on its position, and the first transistor Q1 is in order to On/Off stress sensor 162.Stress sensor 162 can comprise variable resistor or other can change because of suffered stress the element of its physical characteristics.Flexible display 100, by the stress sensor 162 of above-mentioned a plurality of sensing cells 160, is tried to achieve at least one curvature (curvature) of flexible display 100.

Furthermore, in an embodiment of the present invention, the resistance value of each stress sensor 162 can change with the size of its suffered external force, therefore the resistance value of stress sensor 162 can be used as the foundation while estimating the suffered strain of stress sensor 162 (strain) and stress (stress).In an embodiment of the present invention, each stress sensor 162 can comprise variable resistor Rv, and the material of variable resistor Rv can be metal (as: molybdenum (Mo), aluminium (Al), titanium (Ti) ... Deng) or semiconductor material (as: indium tin oxide (ITO), polysilicon (Poly-Si) ... Deng).

In an embodiment of the present invention, flexible display 100 also can comprise sweep circuit 120 and treatment circuit 130.Sweep circuit 120 is in order to pass through in order sweep trace S ₁to S _n, sweep signal V is provided _sto a plurality of sensing cells 160 in a plurality of sensing circuits 150, so that the deformation signal S that treatment circuit 130 can be exported according to the first signal line O1 of each sensing circuit 150 _c1to S _cntry to achieve at least one curvature of flexible display 100.The first transistor Q1 has in order to self-scanning circuit 120 reception sweep signal V _scontrol end G, the first end D of electric property coupling second system voltage Vdd and the second end S of electric property coupling stress sensor 162.In the present embodiment, the first transistor Q1 can be N-type metal oxide semiconductcor field effect transistor (NMOSFET), and control end G, first end D and the second end S are respectively grid, drain electrode and the source electrode of the first transistor Q1.Yet, the present invention is not as limit, the first transistor Q1 also can be the transistor of other types, for example: P-type mos field-effect transistor (PMOSFET), NPN type double carriers junction transistor (NPN BJT), positive-negative-positive double carriers junction transistor (PNP BJT) ... Deng.

Please refer to Fig. 5 while with reference to Fig. 4, the multi-strip scanning line S that Fig. 5 is Fig. 4 ₁to S _nthe sequential chart of voltage signal.As shown in Figure 5, sweep trace S ₁to S _ncurrent potential can be promoted in order sweep signal V _s, to make in order sweep trace S ₁to S _nthe first transistor Q1 conducting coupling.Wherein, in same sensing circuit 150, the first transistor Q1 that the same time only has a sensing cell 160 can be switched on, and a sweep trace S in the end _nbestowed sweep signal V _safter, sweep circuit 120 can be again by article one sweep trace S ₁start scanning and (bestow sweep signal V _s).Wherein, the every run-down sweep trace S intactly of sweep circuit 120 ₁to S _nthe required time can be described as a scan period, and the length of scan period can be adjusted according to different specification or user demands.In an embodiment of the present invention, the scan period of sweep circuit 120 can be adjusted between 1/120 second to 1/15 second, but the present invention is not as limit.In addition, must understand ground, the sweep trace S that Fig. 5 illustrates ₁to S _nthe waveform of current potential be applicable to the embodiment that the first transistor Q1 is NMOSFET or NPN BJT.And be in the embodiment of PMOSFET or PNP BJT at the first transistor Q1, sweep trace S ₁to S _nthe waveform of current potential be respectively the complementary signal (complementary signals) of the voltage signal that Fig. 5 illustrates, that is in Fig. 5, current potential, originally for the place of electronegative potential can become noble potential, and is sweep signal V originally _splace can become electronegative potential.

When arbitrary the first transistor Q1 is switched on, the voltage of the first signal line O1 of its electric property coupling (is deformation signal S _c1to S _cnthe wherein current potential of a deformation signal) can equal the variable resistor Rv of stress sensor 162 and the dividing potential drop between the first resistance R 1.Please refer to Fig. 6, the variable resistor Rv that Fig. 6 is Fig. 4 and the first resistance R 1 equivalent circuit diagram when its corresponding the first transistor Q1 conducting.The voltage V1 of first signal line O1 can represent as follows:

$\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA0000411698080000041.png,HDA0000411698080000051.png"\; state="\{\{state\}\}">V</figure-callout>}1=\frac{R1(\mathrm{Vdd}-\mathrm{Vss})}{\mathrm{Rv}+\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA0000411698080000041.png,HDA0000411698080000051.png"\; state="\{\{state\}\}">R</figure-callout>}1}+\mathrm{Vss}$

When Vss is ground voltage, the voltage V1 of first signal line O1 can be expressed as:

$\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA0000411698080000041.png,HDA0000411698080000051.png"\; state="\{\{state\}\}">V</figure-callout>}1=\frac{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA0000411698080000041.png,HDA0000411698080000051.png"\; state="\{\{state\}\}">R</figure-callout>}1\&times;\mathrm{Vdd}}{\mathrm{Rv}+\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA0000411698080000041.png,HDA0000411698080000051.png"\; state="\{\{state\}\}">R</figure-callout>}1}$

Because the resistance value of the first resistance R 1 is fixed haply, therefore at the first resistance R 1 resistance value and second system voltage Vdd known in the situation that, treatment circuit 130 can (be deformation signal S according to the voltage V1 of first signal line O1 _c1to S _cnthe wherein current potential of a deformation signal), infer the resistance value of variable resistor Rv, and according to the resistance value of variable resistor Rv, calculate the suffered external force of variable resistor Rv.Moreover, because sweep circuit 120 is that sweep signal V is provided in order _sto each sweep trace S ₁to S _n, to make in order each sweep trace S ₁to S _nthe first transistor Q1 conducting coupling, therefore the voltage V1 of each first signal line O1 that treatment circuit 130 can detect according to different scanning time point within a scan period calculates the resistance value of each variable resistor Rv.In addition, because the size possibility of the suffered external force of each variable resistor Rv is different, therefore the voltage V1 of each first signal line O1 may have different numerical value at different somes sweep time.Therefore, within a scan period, treatment circuit 130 can be according to the variation of the voltage V1 of each first signal line O1, try to achieve the resistance value of each variable resistor Rv, and try to achieve flexible display 100 suffered strain (strain) everywhere and at least one curvature of flexible display 100 according to the resistance value of each variable resistor Rv.

Refer again to Fig. 4, each sensing circuit 150 can separately comprise secondary signal line O2, the second resistance R 2 and the 3rd resistance R 3.Wherein, secondary signal line O2 is electrically coupled to treatment circuit 130, and the resistance value of the second resistance R 2 and the 3rd resistance R 3 is constant haply.The second resistance R 2 is electrically coupled between second system voltage Vdd and secondary signal line O2, and the 3rd resistance R 3 is electrically coupled between secondary signal line O2 and the first system voltage Vss.That is one end of the second resistance R 2 is subject to the bias voltage of second system voltage Vdd, and one end of the 3rd resistance R 3 is subject to the bias voltage of the first system voltage Vss.Treatment circuit 130 can, according to the first signal line O1 of each sensing circuit 150 and the variation of the voltage difference between secondary signal line O2, be tried to achieve at least one curvature of flexible display 100.Please refer to Fig. 7 while with reference to Fig. 4, the variable resistor Rv that Fig. 7 is Fig. 4, the first resistance R 1, the second resistance R 2 and the equivalent circuit diagram of the 3rd resistance R 3 when its corresponding the first transistor Q1 conducting.If the voltage of secondary signal line O2 represents with V2, when Vss is ground voltage, the voltage difference delta V between first signal line O1 and secondary signal line O2 can represent as follows:

$\mathrm{\&Delta;V}=\frac{\mathrm{RvR}3-R1R2}{(\mathrm{Rv}+R1)(R2+R3)}\&times;\mathrm{Vdd}$

Because the resistance value of the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3 is fixed haply, therefore in the situation that the resistance value of second system voltage Vdd and the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3 is all known, treatment circuit 130 can be according to voltage difference delta V, infer the resistance value of variable resistor Rv, and according to the resistance value of variable resistor Rv, calculate the suffered stress of variable resistor Rv.Moreover, because sweep circuit 120 is that sweep signal V is provided in order _sto each sweep trace S ₁to S _n, with each sweep trace of conducting S in order ₁to S _nthe first transistor Q1 coupling, therefore treatment circuit 130 can, according to the first signal line O1 of each sensing circuit 150 that different scanning time point detects within a scan period and the voltage difference delta V between secondary signal line O2, calculate the resistance value of each variable resistor Rv.In addition, because the size possibility of the suffered external force of each variable resistor Rv is different, therefore the first signal line O1 of each sensing circuit 150 may have different numerical value from the voltage difference delta V between secondary signal line O2 at different somes sweep time.Therefore, within a scan period, treatment circuit 130 can be according to the variation of first signal line O1 and the voltage difference delta V between secondary signal line O2 of each sensing circuit 150, try to achieve the resistance value of each variable resistor Rv, and try to achieve flexible display 100 strain everywhere and at least one curvature of flexible display 100 according to the resistance value of each variable resistor Rv.

How below to put up with according to the resistance value of each variable resistor Rv, try to achieve flexible display 100 suffered strain everywhere and at least one curvature of flexible display 100 and be described further.Suppose that the resistance value of variable resistor Rv in the situation that not being subject to external stress is R, and the variable quantity of its resistance value is Δ R in the situation that being subject to external stress, the suffered strain stress of variable resistor Rv can be expressed as follows:

$\mathrm{\&epsiv;}=\frac{\mathrm{\&Delta;R}}{R\&times;\mathrm{Gf}}$

Wherein, Gf is resistance rule coefficient (gauge factor).Curvature Κ as for variable resistor Rv whereabouts can be expressed as:

$K=\frac{\mathrm{\&epsiv;}}{y}$

Wherein, y is that variable resistor Rv is apart from the distance of the zero stress face of flexible display 100.

In an embodiment of the present invention, the sensing cell 160 in flexible display 100 can be dissimilar sensing cell, for example: the first sensing cell 160A that Fig. 8 to Figure 10 illustrates, the second sensing cell 160B and/or the 3rd sensing cell 160C.The first sensing cell 160A, the second sensing cell 160B and the 3rd sensing cell 160C be the suffered stress along first direction X, second direction Y and third direction W in order to sensing flexible display 100 respectively, and wherein first direction X, second direction Y and third direction W can be any three uneven directions.In a preferred embodiment of the present invention, second direction Y is haply perpendicular to first direction X, and third direction W is between first direction X and second direction Y.In another preferred embodiment of the present invention, the angle between third direction W and first direction X and second direction Y is 45 degree angles haply, but the present invention is not as limit.In addition, the region in each sensing cell 610,620 and 630 forms respectively grid, drain electrode and the source electrode of the first transistor Q1.The stress sensor 162 of the first sensing cell 160A has the first section 660 of a plurality of serial connections, the stress sensor 162 of the first sensing cell 160A also has serial connection the first serial connection section 661 of the first section 660 between two, the first serial connection section 661 is vertical or substantially vertical with the first section 660, and the first section 660 of a plurality of serial connections is connected in series with a plurality of the first serial connection sections 661 the S type of going into mutually.And these first sections 660 are roughly parallel to first direction X, and the line of the central point of every two the first sections 660 (for example: line ) be approximately perpendicular to first direction X.The stress sensor 162 of the second sensing cell 160B has the second section 670 of a plurality of serial connections, and these second sections 670 are roughly parallel to second direction Y, and the line of the central point of every two the second sections 670 (for example: line

) be approximately perpendicular to second direction Y.The stress sensor 162 of the second sensing cell 160B also has serial connection the second serial connection section 671 of the second section 670 between two, the second serial connection section 671 is vertical or substantially vertical with the second section 670, and the second section 670 of a plurality of serial connections is connected in series with a plurality of the second serial connection sections 671 the S type of going into mutually.The stress sensor 162 of the 3rd sensing cell 160C has the 3rd section 680 of a plurality of serial connections, and these the 3rd sections 680 are haply perpendicular to third direction W.The stress sensor 162 of the 3rd sensing cell 160C also has serial connection the 3rd serial connection section 681 of the 3rd section 680 between two, the 3rd serial connection section 681 is vertical or substantially vertical with the 3rd section 680, and the 3rd section 680 of a plurality of serial connections is connected in series with a plurality of the 3rd serial connection sections 681 the S type of going into mutually.

Stress sensor 162 patterns by different, can detect flexible display 100 strain in different directions easily.And according to the method for Mohrcircle (method of the Mohr ' s circle), principal strain (Principle strain) ε ₁₁and ε ₂₂direction and size can be pushed away by the strain of any three not parallel directions:

${\mathrm{\&epsiv;}}_{11}=\frac{1}{2}[{\mathrm{\&epsiv;}}_X+{\mathrm{\&epsiv;}}_Y+\sqrt{2[{({\mathrm{\&epsiv;}}_X-{\mathrm{\&epsiv;}}_W)}^2+{({\mathrm{\&epsiv;}}_W-{\mathrm{\&epsiv;}}_Y)}^2]}]$

${\mathrm{\&epsiv;}}_{22}=\frac{1}{2}[{\mathrm{\&epsiv;}}_X+{\mathrm{\&epsiv;}}_Y-\sqrt{2[{({\mathrm{\&epsiv;}}_X-{\mathrm{\&epsiv;}}_W)}^2+{({\mathrm{\&epsiv;}}_W-{\mathrm{\&epsiv;}}_Y)}^2]}]$

Wherein, ε _x, ε _yand ε _wbe respectively the strain of flexible display 100 on first direction X, second direction Y and third direction W.Principle stress (Principle stress) σ as for flexible display 100 ₁₁and σ ₂₂, can be expressed as:

${\mathrm{\&sigma;}}_{11}=\frac{E}{1-v^2}({\mathrm{\&epsiv;}}_{11}+{\mathrm{v\&epsiv;}}_{22})$

${\mathrm{\&sigma;}}_{22}=\frac{E}{1-v^2}({\mathrm{\&epsiv;}}_{22}+{\mathrm{v\&epsiv;}}_{11})$

Wherein, E is young's modulus (Young's modulus), and ν is Bai Song than (Poisson ' s ratio).

As shown in figure 11, in an embodiment of the present invention, all sensing cells 160 of the flexible display 900 of another embodiment of the present invention with the mode annular distribution at edge of being close to flexible display 100 in flexible display 100.Treatment circuit 130 can be according to the sensing cell 160 on contiguous flexible display 100 each limits, try to achieve the curvature function on flexible display 100 each limits, and the curvature function according to three limits or four limits of flexible display 100, push away to obtain three limits of flexible display 100 or the curve how much on four limits, and calculate again according to three limits of flexible display 100 or the curve on four limits the surface geometry that the Curves on three limits thus or four limits forms for how much.Please refer to Figure 12, Figure 12 has illustrated the curve of a side of flexible display 100 and four corresponding curvature K of sensing circuit 150 on this curve ₁, K ₂, K ₃and K ₄.X in Figure 12 represents above-mentioned first direction, and Z is the fourth direction perpendicular to first direction X and second direction Y.Four sensing circuits 150 coordinate on first direction X and fourth direction Z is respectively (X ₁, Z ₁), (X ₂, Z ₂), (X ₃, Z ₃) and (X ₄, Z ₄), coordinate (X wherein ₁, Z ₁) be set to initial point, and coordinate (X ₁, Z ₁) to (X ₂, Z ₂) angle between line and first direction X is θ ₂.Suppose at coordinate (X ₁, Z ₁) to (X ₂, Z ₂) between cutting be n section, can utilize interpolation method push away flexible display 100 in coordinate (X ₁, Z ₁) to (X ₂, Z ₂) between how much of the approximate curves of n section.Similarly, coordinate (X ₂, Z ₂) to (X ₃, Z ₃) between and coordinate (X ₃, Z ₃) to (X ₄, Z ₄) between also can utilize interpolation method to try to achieve corresponding approximate curve how much.

In addition, as shown in figure 13, the mode that all sensing cells 160 of the flexible display 1100 of another embodiment of the present invention are arranged with matrix is arranged in flexible display 100.In the present embodiment, each sensing cell 160 can comprise the first transistor Q1 and the variable resistor R of two groups of serial connections, for example, in order to detect the strain on two different directions (: first direction X and second direction Y), and treatment circuit 130 is by the strain of each sensing cell 160 two different directions of detecting, can obtain the three-dimensional stereo model 1300 of the corresponding curvature vector of each sensing cell 160 (curvature vector) 1200 as shown in figure 14 and/or flexible display as shown in figure 15 1100.

In an embodiment of the present invention, treatment circuit 130 can be adjusted the shown picture of flexible display 100 according at least one curvature of flexible display 100 of trying to achieve or the case of bending of flexible display 100.Please refer to Figure 16, Figure 16 adjusts display frame in order to the flexible display 100 of key diagram 1 according to the curvature of trying to achieve.When flexible display 100 is originally to display while being a picture with rectangle pattern, if flexible display 100 is scratched by curved, treatment circuit 130 can be adjusted the shown picture of flexible display 100 according at least one curvature of the flexible display 100 of trying to achieve, although and make flexible display 100 shown be the picture of a pattern that comprises distortion 105, but when beholder is during from visual angle 107 viewing graphic pattern 105, what watch can be but a picture that is presented on virtual plane 103 and includes a rectangle pattern 106.

In addition, in other embodiments of the invention, the pixel control circuit 114 of each above-mentioned pixel 112 separately includes transistor seconds Q2, and above-mentioned the first transistor Q1 and transistor seconds Q2 are formed among the tft layer 170 of flexible display 100 by identical manufacture craft.Wherein, flexible display 100 can provide the grid of periodic sweep signal to transistor seconds Q2, so that periodically conducting of transistor seconds Q2.When transistor seconds Q2 conducting, flexible display 100 can apply voltages to by the transistor seconds Q2 of conducting the pixel electrode of pixel 112, to upgrade the show state (as: GTG) of pixel 112.

Please refer to Figure 17, the region cut-open view of the flexible display 100 that Figure 17 is one embodiment of the invention.As shown in the figure, the structural sheet of flexible display 100 includes bendable substrate 110, polysilicon layer (poly-silicon layer) 1520, protective seam (passivation layer) 1530, gate insulator (gate insulator layer) 1540, metal level 1550, protective seam 1560, anode (anode) layer 1570, Organic Light Emitting Diode (OLED) layer 1580 and negative electrode (cathode) layer 1590.Wherein, polysilicon layer 1520, protective seam 1530, each grid G and gate insulator 1540 form above-mentioned tft layer 170, and anode layer 1570, Organic Light Emitting Diode layer 1580 and cathode layer 1590 form above-mentioned display layer 180.In addition, between bendable substrate 110 and tft layer 170, can separately form cushion (buffer layer) 1510, and can separately form protective seam 1560 between tft layer 170 and display layer 180.1580, Organic Light Emitting Diode layer can comprise luminescent layer (emissive layer) and the conductive layer (conductive layer) being comprised of special organic molecule.The source S of the transistor seconds Q2 of pixel 112 and the first transistor Q1 of sensing cell 160 and drain D are all formed in the polysilicon layer 1520 between cushion 1510 and protective seam 1530, and the grid G of transistor seconds Q2 and the first transistor Q1 is all formed in the same structure layer between protective seam 1530 and gate insulator 1540.In addition, the source S of transistor seconds Q2 and drain D and stress sensor 162 are all formed in the polysilicon layer 1520 of flexible panel extends roller.

In other embodiments of the invention, stress sensor 162 also can be formed in other structural sheets of flexible panel extends roller.As shown in figure 18, stress sensor 162 is formed in the same structure layer of flexible panel extends roller with grid (or title " the control end ") G of transistor seconds Q2.Or as shown in figure 19, the source S of transistor seconds Q2 and drain D are electrically coupled to metal level 1550, and stress sensor 162 is formed in metal level 1550.The mode of the first transistor Q1 and stress sensor 162 by above-mentioned various formation sensing cells 160, the sensing circuit 150 that includes a plurality of the first transistor Q1 must can not be formed on the transistor seconds Q2 of pixel 112 in same structure body by viscose glue, and the deviation owing to can avoid metamorphosis because of viscose glue to cause calculating strain and stress time, therefore can guarantee further the accuracy of the present invention when calculating the curvature of flexible display 100.

In sum, the flexible display of the embodiment of the present invention can be tried to achieve in flexible panel extends roller variable-resistance resistance value everywhere according to the change in voltage of many first signal lines, and according to each variable-resistance resistance value, accurately tries to achieve at least one curvature of flexible display.After trying to achieve the accurate curvature of flexible display, can be according to tried to achieve curvature, the operation that flexible display is correlated with, for example: the feedback of adjustment of image, user's action ... Deng.Therefore,, when user is curved while scratching flexible display, the present invention can accurately judge the mutual-action behavior between user and flexible panel extends roller, and can give accurate feedback to user's action.In addition, above-mentioned a plurality of pixel control circuits and a plurality of sensing circuit are formed on the tft layer of flexible display, and can simplify the manufacture craft of flexible display.

The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to embodiment of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (10)

1. a flexible display, comprises:

Display layer, has a plurality of display elements;

Tft layer, this tft layer has a plurality of pixel control circuits and a plurality of sensing circuit, and those pixel control circuits are in order to control those display elements, and each those sensing circuit is in order to provide a deformation signal according to the deformation of this flexible display; And

Bendable substrate, with the stacking setting of this tft layer.

2. flexible display as claimed in claim 1, wherein each sensing circuit comprises:

First signal line, this deformation signal providing in order to transmit each sensing circuit;

The first resistance, is electrically coupled between this first signal line and a first system voltage; And

A plurality of sensing cells, are electrically coupled between this first signal line and a second system voltage, and each those sensing cell comprises:

The first transistor, has control end, first end and the second end, and this control end is in order to receive one scan signal, and this second system voltage of this first end electric property coupling; And

Stress sensor, is electrically coupled between this second end and this first resistance of this first transistor, and this stress sensor is in order to change its resistance value according to the size of the suffered external force of this stress sensor;

This flexible display also comprises a treatment circuit, is electrically coupled to those first signal lines of those sensing circuits, tries to achieve at least one curvature of this flexible display in order to this deformation signal transmitting according to each those first signal line.

3. flexible display as claimed in claim 2, wherein each those sensing circuit separately comprises:

Secondary signal line;

The second resistance, is electrically coupled between this second system voltage and this secondary signal line; And

The 3rd resistance, is electrically coupled between this first system voltage and this secondary signal line;

Wherein this treatment circuit is electrically coupled to those secondary signal lines of those sensing circuits, and in order to the voltage difference between this deformation signal according to each those sensing circuit and this secondary signal line, tries to achieve at least one curvature of this flexible display.

4. flexible display as claimed in claim 2, wherein those sensing cells comprise:

A plurality of the first sensing cells, suffered stress in order to this flexible display of sensing along a first direction, this stress sensor of each those the first sensing cell has a plurality of first sections of serial connection, and those first sections are roughly parallel to this first direction, and the line of the central point of every two those the first sections is approximately perpendicular to this first direction; And

A plurality of the second sensing cells, suffered stress in order to this flexible display of sensing along a second direction, this second direction is haply perpendicular to this first direction, this stress sensor of each those the second sensing cell has a plurality of second sections of serial connection, and those second sections are roughly parallel to this second direction, and the line of the central point of every two those the second sections is approximately perpendicular to this second direction.

5. flexible display as claimed in claim 2, wherein each pixel control circuit comprises transistor seconds, and those stress sensors of the source electrode of this transistor seconds and drain electrode and those sensing cells are formed in the same structure layer of this flexible display.

6. flexible display as claimed in claim 2, wherein each pixel control circuit comprises transistor seconds, and those stress sensors of a control end of this transistor seconds and those sensing cells are formed in the same structure layer of this flexible display.

7. flexible display as claimed in claim 2, wherein each pixel control circuit comprises transistor seconds, and the source electrode of this transistor seconds and drain electrode are electrically coupled to a metal level, and those stress sensors of those sensing cells are formed in this metal level.

8. flexible display as claimed in claim 2, wherein each pixel control circuit comprises transistor seconds, and a control end of this transistor seconds and each this control end of those the first transistors are formed in the same structure layer of this flexible display.

9. flexible display as claimed in claim 2, the mode that wherein all sensing cells of those sensing circuits are arranged with matrix or the mode around this flexible display is arranged in this flexible display with the edge of contiguous this flexible display.

10. flexible display as claimed in claim 2, the picture that wherein this flexible display shows is this at least one curvature adjustment according to this flexible display.

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