CN102360257A - Light sensation type touch device and drive method thereof - Google Patents
Light sensation type touch device and drive method thereof Download PDFInfo
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- CN102360257A CN102360257A CN2011103173723A CN201110317372A CN102360257A CN 102360257 A CN102360257 A CN 102360257A CN 2011103173723 A CN2011103173723 A CN 2011103173723A CN 201110317372 A CN201110317372 A CN 201110317372A CN 102360257 A CN102360257 A CN 102360257A
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- light sensation
- photoinduction
- control device
- driving voltage
- contactor control
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Abstract
The invention provides a light sensation type touch device and a drive method thereof. The drive method comprises the step of: defining a scheduled period, wherein the scheduled period comprises a sensation period and an updating period, a first drive voltage is provided to the light sensation type touch device in the sensation period, and a second drive voltage is provided to the light sensation touch type touch device in the updating period. The light sensation type touch device and the drive method provided by the invention are used for correction deviation of a light sensation type film crystal in the updating period, thereby overcoming the problem of deviation of a leakage current-bias voltage curve and further ensuring that whether the light sensation type touch device is more accurately touched.
Description
Technical field
The present invention relates to display, relate in particular to light sensation formula contactor control device and driving method thereof in the display.
Background technology
In recent years; The electronic product of tool panel input mechanism has become the product fashion trend; Utilize input display as the communication interface between user and electronic product; Can let the user directly control the operation of electronic product, and need not pass through keyboard or mouse, like electric resistance touch-control panel display, capacitance type touch-control panel display, light sensation formula contact panel display through display.
For light sensation formula contact panel display, also have photoinduction element in it, like the photoinduction transistor, its principle is to utilize the leakage current difference of the photoinduction element that different irradiation intensity are caused, and judges thereby carry out touch-control.Such as, in the irradiation of finger touches, surround lighting and light pen touch-control following time, the leakage current of photoinduction element is respectively I
D-a, I
D-bAnd I
D-c, and it is big more that photoinduction element is accepted irradiation intensity, and leakage current is also big more, and then can know I
D-a＜I
D-b＜I
D-c, handle according to subsequent conditioning circuit afterwards, can know that whether photoinduction element is by touch-control.
Yet when photoinduction element is pressed or irradiation for a long time for a long time, its leakage current-bias plot will squint, promptly squint to the negative direction of bias voltage.Even and when photoinduction element by touch-control because its leakage current-bias plot squinted, follow-uply judge whether photoinduction element is prone to make mistakes by touch-control, promptly produce the erroneous judgement problem.
Summary of the invention
Judge that in order to solve whether photoinduction element is by the issuable erroneous judgement problem of touch-control.
One side of the present invention has proposed a kind of driving method, is used for a light sensation formula contactor control device, comprises: define a predetermined period; Said predetermined period comprises between a sensitive period and a reproducting periods; Wherein, between said sensitive period, provide one first driving voltage to said light sensation formula contactor control device; In said reproducting periods, provide one second driving voltage to said light sensation formula contactor control device.
Preferably, said first driving voltage is greater than or equal to zero, and said second driving voltage is less than zero.
Preferably, can regulate with the time size of said reproducting periods between said sensitive period.
Preferably, perhaps unequal between said sensitive period with the time equal and opposite in direction of said reproducting periods.
Another aspect of the present invention has proposed a kind of light sensation formula contactor control device, comprises: a photoinduction unit, in order to produce a photocurrent according to an input optical signal and a driving voltage; One energy-storage units is coupled to said photoinduction unit, and wherein, when said photoinduction unit produced photocurrent, said energy-storage units discharged to said photoinduction unit; And a sensing element, be coupled to said photoinduction unit and said energy-storage units, in order to produce an output voltage; Wherein, between a sensitive period, provide one first driving voltage, in a reproducting periods, provide one second driving voltage, constitute a predetermined period with said reproducting periods between said sensitive period to drive said photoinduction unit to drive said photoinduction unit.
Preferably, said photoinduction unit comprises: a photoinduction thin film transistor (TFT), the difference of the input voltage of its grid and source electrode are said first driving voltage or said second driving voltage.
Preferably, said energy-storage units comprises: an electric capacity, it sees through the drain electrode that a node is coupled to said photoinduction thin film transistor (TFT).
Preferably, said sensing element comprises: a thin film transistor (TFT), and its source electrode is coupled to said node, and its grid couples a gate line, said second voltage of its drain electrode output.
Preferably, said first driving voltage is greater than or equal to zero, and said second driving voltage is less than zero.
One side more of the present invention has proposed a kind of display, and it comprises above-mentioned one or more light sensation formula contactor control device.
To sum up; Light sensation formula contactor control device and driving method thereof proposed by the invention; At reproducting periods the photoinduction thin film transistor (TFT) is carried out positive bias, thereby overcome leakage current-bias plot offset problem, and then make and follow-uply judge whether light sensation formula contactor control device is more accurate by touch-control.
Description of drawings
Fig. 1 has illustrated the synoptic diagram of the light sensation formula contactor control device of an embodiment of the present invention;
Fig. 2 has illustrated the driving method control timing figure of the light sensation formula contactor control device of another embodiment of the present invention;
Fig. 3 has illustrated the control timing figure of first embodiment of embodiment shown in Figure 2;
Fig. 4 has illustrated the control timing figure of second embodiment of embodiment shown in Figure 2;
Fig. 5 has illustrated the control timing figure of the 3rd embodiment of embodiment shown in Figure 2; And
Fig. 6 has illustrated the control timing figure of the 4th embodiment of embodiment shown in Figure 2.
Embodiment
Below will and specify clear explaination embodiment of the present invention with accompanying drawing, for the purpose of simplifying accompanying drawing, some known habitual structures and assembly will illustrate with the mode of simple signal in the accompanying drawings.
With reference to Fig. 1, Fig. 1 has illustrated the synoptic diagram of the light sensation formula contactor control device of an embodiment of the present invention.
As shown in Figure 1, light sensation formula contactor control device 100 comprises: a photoinduction unit 110, an energy-storage units 120 and a sensing element 130.Photoinduction unit 110 is in order to produce a photocurrent according to an input optical signal and a driving voltage; Energy-storage units 120 is coupled to photoinduction unit 110, and energy-storage units 120 can be used for when photoinduction unit 110 produces photocurrent, and the electric charge that it is stored discharges to photoinduction unit 110; Sensing element 130 is coupled to photoinduction unit 110 and energy-storage units 120, and it is in order to produce an output voltage.
In this embodiment, photoinduction unit 110 can be the photoinduction transistor, preferably, is photoinduction thin film transistor (TFT) P (Photo TFT), but not as limit, also can is other photoinduction transistor.Its grid inserts a voltage signal W
N+1, so that form voltage V at its grid place
g, its source electrode inserts a voltage signal S
N+1, so that form voltage V at its source electrode place
s, and voltage V
gWith voltage V
sDifference be the driving voltage V of photoinduction thin film transistor (TFT) P
Gs
In this embodiment, energy-storage units 120 can be a capacitor C, and an end of capacitor C is coupled to a node N mutually with the drain electrode of photoinduction thin film transistor (TFT) P, the voltage V at this node N place
aRelevant with the electric charge that capacitor C is stored.
In this embodiment, sensing element 130 can be a thin film transistor (TFT) T, and its source electrode is coupled to node N, promptly couples mutually with photoinduction thin film transistor (TFT) P and capacitor C, and its grid couples a gate line (not illustrating), and this gate line is used to provide a voltage signal G
n, this voltage G
nCan with voltage V
aBe used for drive thin film transistors T, so that thin film transistor (TFT) T conducting, and then make thin film transistor (TFT) T produce an output voltage V through its source electrode
Out
In this embodiment, as the driving voltage V that grid and source electrode provided of photoinduction thin film transistor (TFT) P
Gs, when promptly photoinduction thin film transistor (TFT) P is in the negative bias state, will make photoinduction thin film transistor (TFT) P produce leakage current I so at＜0 o'clock
Ds, and then make capacitor C discharge to photoinduction thin film transistor (TFT) P.Because photoinduction thin film transistor (TFT) P is the light sensation assembly, so its leakage current I
DsThe big young pathbreaker of (photocurrent) changes along with environment light source to some extent.So in 100 last times of light sensation formula contactor control device, environment light source is covered, the leakage current I of photoinduction thin film transistor (TFT) P as finger touches
DsTherefore can reduce, on the contrary, in 100 last times of light sensation formula contactor control device, light source will be strengthened, so the leakage current I of photoinduction thin film transistor (TFT) P as the light pen touch-control
DsTo increase.In addition, owing to capacitor C is discharged to photoinduction thin film transistor (TFT) P, with the voltage V that makes node N place
aChange, specifically change the leakage current I of big young pathbreaker according to photoinduction thin film transistor (TFT) P
DsSize and discharge time are relevant.Since V
aVariation will cause the output voltage V of thin film transistor (TFT) T
OutChange, and then according to output voltage V
OutVariation judge that whether photo induction touch-control device 100 is by touch-control.In brief, in this embodiment, because the change of the incident intensity of photoinduction thin film transistor (TFT) P will make its leakage current I
Ds, change, and then cause the output voltage V of thin film transistor (TFT) T
OutChange, and then can judge that whether light sensation formula contactor control device 100 is by touch-control.But because the skew of leakage current-bias plot possibly cause judging whether light sensation formula contactor control device 100 is made mistakes by touch-control.
Therefore, in this embodiment, provide driving voltage necessarily to adjust for photoinduction thin film transistor (TFT) P; Specifically, in a predetermined period, and be divided between sensitive period this predetermined period and reproducting periods; In between sensitive period, the driving voltage V that provides
GsLess than zero, in reproducting periods, the driving voltage V that provides
GsBe greater than or equal to zero, and as driving voltage V
GsGreater than zero the time, at this moment, can charge to capacitor C through photoinduction thin film transistor (TFT) P, thereby to the voltage V of node N place
aCompensate, and then overcome leakage current-bias plot offset problem, specifically can be with reference to description.
With reference to Fig. 2, Fig. 2 has illustrated the driving method control timing figure of the light sensation formula contactor control device of another embodiment of the present invention.
Under request in person simultaneously with reference to Fig. 1 and shown in Figure 2, will do further elaboration to the driving and the running thereof of light sensation formula contactor control device 100.
As shown in Figure 2, predetermined period t can be divided into t between sensitive period
sWith reproducting periods t
r
At first, t between sensitive period
sIn, the voltage signal W that the grid that makes photoinduction thin film transistor (TFT) P is provided
N+1The voltage signal S that provides with its source electrode
N+1Form negative bias, i.e. V
Gs＜0, thus make photoinduction thin film transistor (TFT) P produce leakage current I
Ds, and then capacitor C is discharged to photoinduction thin film transistor (TFT) P.
Then, at reproducting periods t
rIn, the voltage signal W that the grid that makes photoinduction thin film transistor (TFT) P is provided
N+1The voltage signal S that provides with its source electrode
N+1Form positive bias, i.e. V
Gs＞0, at this moment, can charge to capacitor C through photoinduction thin film transistor (TFT) P.At this embodiment, the driving voltage that also can make photoinduction thin film transistor (TFT) P is zero, i.e. V
Gs=0, photoinduction this moment thin film transistor (TFT) P does not produce leakage current, thereby can stop capacitor C thin film transistor (TFT) P is discharged.In this embodiment, can also define t between a reading duration
Out, t between this reading duration
OutIn, the output voltage V that can read thin film transistor (TFT) T
Out, but need explanation be, in some other embodiment, also can be with t between reading duration
OutBe defined in t between sensitive period
sIn, not as limit.
In this embodiment, what need explanation is t between sensitive period
sWith reproducting periods t
rTime span can regulate, and can regulate that the time span that makes both equates or unequal.
With respect to only there being t between sensitive period in the prior art
s, and in this embodiment, t between sensitive period has been proposed not only
sAfter, reproducting periods t has also been proposed
r, and at reproducting periods t
rIn, can be through photoinduction thin film transistor (TFT) P to the capacitor C (V that charges
Gs＞0) perhaps make capacitor C stop discharge to photoinduction thin film transistor (TFT) P, thereby with respect to prior art, the voltage V at node N place
aHigher relatively, thus overcome the drawback of leakage current-bias plot skew, and then make that follow-up to judge whether that light sensation formula contactor control device 100 is carried out touch-control more accurate.
With reference to Fig. 3, Fig. 3 has illustrated the control timing figure of first embodiment of embodiment shown in Figure 2 below.
As shown in Figure 3, predetermined period t comprises t between sensitive period
sWith reproducting periods t
r, t between sensitive period
sIn, V
Gs=[10-(6)]=-4V, less than 0, at reproducting periods t
rIn, V
Gs=(20-16)=and 4V, greater than 0.
With reference to Fig. 4, Fig. 4 has illustrated the control timing figure of second embodiment of embodiment shown in Figure 2 below.
As shown in Figure 4, the difference of the present embodiment and first embodiment is t between sensitive period
sWith reproducting periods t
rTime span adjust.And, in the present embodiment, t between sensitive period
sIn, V
Gs=-4V is less than 0, at reproducting periods t
rIn, V
Gs=4V is greater than 0.
With reference to Fig. 5, Fig. 5 has illustrated the control timing figure of the 3rd embodiment of embodiment shown in Figure 2 below.
As shown in Figure 5, the difference of the present embodiment and first embodiment is, the input voltage signal W of the grid of photoinduction thin film transistor (TFT) P
N+1Not only comprise 20V ,-10V, also comprise another magnitude of voltage 0.7V.In the present embodiment, t between sensitive period
sIn, V
Gs=-4V is less than 0, at reproducting periods t
rIn, V
Gs=0.7V is greater than 0.
With reference to Fig. 6, Fig. 6 has illustrated the control timing figure of the 4th embodiment of embodiment shown in Figure 2 below.
As shown in Figure 6, the difference of present embodiment and the 3rd embodiment is t between sensitive period
sWith reproducting periods t
rTime span adjust and t between sensitive period
sWith reproducting periods t
rUnequal.In the present embodiment, t between sensitive period
sIn, V
Gs=-4V is less than 0, at reproducting periods t
rIn, V
Gs=0.7V is greater than 0.
To sum up can know t between sensitive period
sWith reproducting periods t
r, time span can regulate arbitrarily, and between sensitive period t
sPerhaps reproducting periods t
rIn, can also regulate the driving voltage of photoinduction thin film transistor (TFT) P, only need meet t between sensitive period
sIn, V
Gs＜0, at reproducting periods t
rIn, V
Gs＜0 or V
Gs=0.
In the preceding text, illustrate and describe embodiment of the present invention.But those skilled in the art can understand, and under situation without departing from the spirit and scope of the present invention, can also specific embodiments of the invention do various changes and replacement.These changes and replacement all drop in claims of the present invention institute restricted portion.
Claims (10)
1. a driving method is used for a light sensation formula contactor control device, it is characterized in that, comprises:
Define a predetermined period, said predetermined period comprises between a sensitive period and a reproducting periods,
Wherein, between said sensitive period, provide one first driving voltage, in said reproducting periods, provide one second driving voltage to said light sensation formula contactor control device to said light sensation formula contactor control device.
2. driving method according to claim 1 is characterized in that, said first driving voltage is greater than or equal to zero, and said second driving voltage is less than zero.
3. driving method according to claim 1 is characterized in that, can regulate with the time size of said reproducting periods between said sensitive period.
4. driving method according to claim 1 is characterized in that, and is perhaps unequal with the time equal and opposite in direction of said reproducting periods between said sensitive period.
5. a light sensation formula contactor control device is characterized in that, comprises:
One photoinduction unit is in order to produce a photocurrent according to an input optical signal and a driving voltage;
One energy-storage units is coupled to said photoinduction unit, and wherein, when said photoinduction unit produced photocurrent, said energy-storage units discharged to said photoinduction unit; And
One sensing element is coupled to said photoinduction unit and said energy-storage units, in order to produce an output voltage;
Wherein, between a sensitive period, provide one first driving voltage, in a reproducting periods, provide one second driving voltage, constitute a predetermined period with said reproducting periods between said sensitive period to drive said photoinduction unit to drive said photoinduction unit.
6. light sensation formula contactor control device according to claim 5 is characterized in that, said photoinduction unit comprises:
One photoinduction thin film transistor (TFT), the difference of the input voltage of its grid and source electrode are said first driving voltage or said second driving voltage.
7. light sensation formula contactor control device according to claim 6 is characterized in that said energy-storage units comprises:
One electric capacity, it sees through the drain electrode that a node is coupled to said photoinduction thin film transistor (TFT).
8. light sensation formula contactor control device according to claim 7 is characterized in that said sensing element comprises:
One thin film transistor (TFT), its source electrode is coupled to said node, and its grid couples a gate line, said second voltage of its drain electrode output.
9. light sensation formula contactor control device according to claim 5 is characterized in that, said first driving voltage is greater than or equal to zero, and said second driving voltage is less than zero.
10. a display is characterized in that, comprises:
Light sensation formula contactor control device described in one or more said claim 5 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103173723A CN102360257A (en) | 2011-10-12 | 2011-10-12 | Light sensation type touch device and drive method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103173723A CN102360257A (en) | 2011-10-12 | 2011-10-12 | Light sensation type touch device and drive method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103123554A (en) * | 2012-11-16 | 2013-05-29 | 友达光电股份有限公司 | Light sensing circuit and light sensing control method |
| CN105044952A (en) * | 2015-08-27 | 2015-11-11 | 京东方科技集团股份有限公司 | Optical sensor and driving method thereof |
| TWI634469B (en) * | 2017-05-04 | 2018-09-01 | 友達光電股份有限公司 | Light sensing circuit |
| CN112527153A (en) * | 2020-07-16 | 2021-03-19 | 友达光电股份有限公司 | Pixel circuit for touch sensing and light sensing |
-
2011
- 2011-10-12 CN CN2011103173723A patent/CN102360257A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123554A (en) * | 2012-11-16 | 2013-05-29 | 友达光电股份有限公司 | Light sensing circuit and light sensing control method |
| CN103123554B (en) * | 2012-11-16 | 2016-04-06 | 友达光电股份有限公司 | Light sensing circuit and light sensing control method |
| CN105044952A (en) * | 2015-08-27 | 2015-11-11 | 京东方科技集团股份有限公司 | Optical sensor and driving method thereof |
| WO2017032232A1 (en) * | 2015-08-27 | 2017-03-02 | Boe Technology Group Co., Ltd. | Optical sensing device, semiconductor device containing the same, and method for driving the same |
| CN105044952B (en) * | 2015-08-27 | 2018-05-22 | 京东方科技集团股份有限公司 | A kind of optical sensor and its driving method |
| US10788919B2 (en) | 2015-08-27 | 2020-09-29 | Boe Technology Group Co., Ltd. | Optical sensing device, semiconductor device containing the same, and method for driving the same |
| TWI634469B (en) * | 2017-05-04 | 2018-09-01 | 友達光電股份有限公司 | Light sensing circuit |
| CN112527153A (en) * | 2020-07-16 | 2021-03-19 | 友达光电股份有限公司 | Pixel circuit for touch sensing and light sensing |
| CN112527153B (en) * | 2020-07-16 | 2023-05-26 | 友达光电股份有限公司 | Pixel circuit for touch sensing and light sensing |
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Application publication date: 20120222 |