The utility model content
The purpose of this utility model is to provide a kind of display device, is intended to solve the problem that induction technology is subjected to ambient light effects easily.
The utility model is to realize like this, a kind of display device, comprise display panel, wherein said display panel comprises array basal plate (Array Substrate), and described display device also comprises at least one environment light sensor, a plurality of touch-control sensor, reading unit and touch-control control module.Environment light sensor is arranged on the array base palte, in order to detect surround lighting and to produce first influence value.Touch-control sensor is arranged on the array base palte of display panel equally, in order to detect position of touch and to produce second influence value.Reading unit is connected to environment light sensor and touch-control sensor, in order to read first influence value and second influence value.The touch-control control module is connected to reading unit, when surround lighting changes, compensates second influence value in order to corresponding first influence value, so that second influence value of touch-control sensor meets correct touch detection standard after compensation.
More specifically, described reading unit comprises:
One operational amplifier has an inverting input, a non-inverting input and an output terminal, and described inverting input is connected to described environment light sensor and described a plurality of touch-control sensor, and described non-inverting input is connected to a reference voltage;
One electric capacity has one first end and be connected to described inverting input, and one second end is connected to described output terminal;
One switch has one first end and be connected to described inverting input, and one second end is connected to described output terminal; And
One analog/digital converter is connected to described output terminal, is converted to numeral output in order to the simulation output with described output terminal.
More specifically, described operational amplifier, electric capacity, switch and analog/digital converter are integrated in an integrated circuit.
More specifically, described environment light sensor is a thin film transistor (TFT) optical inductor.
More specifically, each described touch-control sensor is a thin film transistor (TFT) optical inductor.
More specifically, described display device also comprises:
A plurality of pixel cells in order to show image;
At least one gate drive unit is connected with a plurality of pixel cells by many gate lines, drives described a plurality of pixel cell;
At least one source drive unit is connected with a plurality of pixel cells by many source electrode lines, and the output pixel shows signal is to described a plurality of pixel cells; And
One indicative control unit is connected to described gate drive unit and described source drive unit, in order to control described gate drive unit and described source drive unit.
More specifically, described environment light sensor is connected in described many gate lines one.
More specifically, described touch-control sensor is connected in described many gate lines one.More specifically, described indicative control unit and described touch-control control module are integrated in a module.
Display device of the present utility model is detected surround lighting by environment light sensor, according to the second influence value compensation of varying environment light to touch-control sensor, avoids the power of surround lighting to cause the touch-control sensing mistake or respond to bad problem generation.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model embodiment, display device comprises display panel, and display panel comprises array basal plate, and display device also comprises at least one environment light sensor, a plurality of touch-control sensor, reading unit and touch-control control module.Environment light sensor is arranged on the array base palte, touch-control sensor is arranged on the array base palte of display panel equally, reading unit is connected to environment light sensor and touch-control sensor, the touch-control control module is connected to reading unit, realized of the second influence value compensation of varying environment light, avoided the power of surround lighting to cause the touch-control sensing mistake or respond to bad touch-control sensor.
See also Fig. 1, Fig. 1 shows the system architecture diagram of the display device 100 that the utility model embodiment provides.Display panel 102 comprises array basal plate (scheming not shown).The display device 100 of tool display panel 102 comprises environment light sensor 108, a plurality of touch-control sensor 110, reading unit 104 and touch-control/indicative control unit 106, gate drive unit 114 and source drive unit 116.Display panel 102 also comprises a plurality of pixel cells 112.Environment light sensor 108 is arranged at (seeing below literary composition describes in detail) on the array base palte, in order to detect the strong and weak of display panel 102 context light and to produce first influence value, in the utility model embodiment, environment light sensor 108 is arranged on four corners of display panel 102, the reason that is arranged at the corner is that the corner is less by touch-control, more can not influence the detecting of surround lighting.Touch-control sensor 110 is arranged at (seeing below literary composition describes in detail) on the array base palte of display panel 102, in order to detect position of touch and to produce second influence value, because the area of finger touch is contained a plurality of pixel cells 112 usually, therefore every plurality of pixel cells 112 touch-control sensor 110 is set in the horizontal direction of display panel 102 and vertical direction and gets final product, four touch-control sensors 110 are set among the utility model embodiment altogether.What pay special attention to is, the quantity of environment light sensor 108 and touch-control sensor 110 can increase and decrease according to actual demand, and quantity shown in Figure 1 only is non-limiting usefulness for example.
Reading unit 104 is connected to environment light sensor 108 and touch-control sensor 110, in order to read the influence value of environment light sensor 108 and touch-control sensor 110, i.e. and first influence value and second influence value.Touch-control/indicative control unit 106 comprises the touch-control control module in order to control reading unit 104, and indicative control unit is in order to control grid driver element 114 and source drive unit 116.In the present embodiment, both are integrated in a module touch-control control module and indicative control unit, also can divide certainly to be arranged.Touch-control/indicative control unit 106 is connected to reading unit 104, judges in order to first influence value of foundation environment light sensor 108 whether surround lighting changes.When surround lighting changes, second influence value of touch-control/indicative control unit 106 compensating touch control inductors 110, so that second influence value meets correct touch detection standard after compensation, compensation way will be in being explained in detail after a while.
Gate drive unit 114 drives pixel cell 112 by many gate lines 118.Source drive unit 116 by many source electrode lines 120 output pixel shows signal to pixel cell 112.Touch-control/indicative control unit 106 is connected to gate drive unit 114 and source drive unit 116, in order to control grid driver element 114 and source drive unit 116.
Environment light sensor 108 and touch-control sensor 110 are thin film transistor (TFT) (Thin FilmTransistor, TFT) optical inductor.Please consult Fig. 2 A and Fig. 2 B simultaneously, show the structural drawing and the sectional view of the environment light sensor 108 that the utility model embodiment provides respectively.Environment light sensor 108 comprises photistor Q
S, oxide-semiconductor control transistors Q
GAnd storage capacitors C
SPhotistor Q
SAnd oxide-semiconductor control transistors Q
GBe made on the array base palte 202 of display panel 102 storage capacitors C
SWhere qualification is made in, and generally is made in oxide-semiconductor control transistors Q
GNear.(Black Matrix, BM) 208 have opening 206 to the black matrix" of colored filter substrate (Color FilterSubstrate) 204, for the usefulness of surround lighting irradiation.As photistor Q
SBehind the irradiation, because photoelectric effect produces current i PHOTO, current i PHOTO is to storage capacitors C
SCharging is by oxide-semiconductor control transistors Q
GConducting to read storage capacitors C
SStored charge, can detect the power of surround lighting.Because current i
PHOTOUsually comparatively small, so oxide-semiconductor control transistors Q
GEvery Δ t time conducting once, accumulation is read than being easy to behind the multi-charge.Above-mentioned oxide-semiconductor control transistors Q
GThe control voltage V that conducting is required
GATE, can provide by the gate line 118 of Fig. 1, so environment light sensor 108 is connected to a wherein gate line 118, promptly share gate lines 118 with pixel cell 112.The Δ t time then is expression gate drive unit 114 each gate line 118 twice interlude of scanning.
Stored charge Q among the above-mentioned storage capacitors CS
OUTPUTBe calculated as follows:
Q
OUTPUT=i
PHOTOxΔt
Below will illustrate how to read stored charge Q
OUTPUTSee also Fig. 3 A, the reading unit 104 that Fig. 3 A shows Fig. 1 that the utility model embodiment provides reads the synoptic diagram of the numerical value of environment light sensor 108.Reading unit 104 comprises operational amplifier 302, capacitor C
F, switch SW
1And analog/digital converter 304.Operational amplifier 302 has inverting input, non-inverting input and output terminal.Inverting input is connected to environment light sensor 108, and non-inverting input is connected to reference voltage V
REFCapacitor C
FHave first end and be connected to inverting input, and second end is connected to output terminal.Switch SW
1Have first end and be connected to inverting input, and second end is connected to output terminal.Analog/digital converter 304 is converted to numeral output in order to the simulation output with output terminal.Above-mentioned operational amplifier 302, capacitor C
F, switch SW
1And analog/digital converter 304 can be integrated in an integrated circuit.
When reading storage capacitors C
SIn stored charge Q
OUTPUTThe time, switch SW
1Conducting (ON), because operational amplifier 302 has negative feedback and the infinitely-great characteristic that gains, therefore two input ends can be considered imaginary short (Virtual Short Circuit), operational amplifier 302 output voltage V
OUTAccurate position can drop to the reference voltage V of the non-inverting input of operational amplifier 302
REF, shown in Fig. 3 B, Fig. 3 B shows the control voltage V of Fig. 3 A that the utility model embodiment provides
GATEAnd output voltage V
OUTOscillogram.Treat subsequently again with switch SW
1Lead disconnection (OFF) and gate line 118 oxide-semiconductor control transistors Q is provided
GThe control voltage V that conducting is required
GATEThe time, storage capacitors C
STo being connected in data line 122 discharges between environment light sensor 108 and the reading unit 104, operational amplifier 302 output voltage variation delta V
OUTFor:
ΔV
OUT=Q
OUTPUT/C
F=i
PHOTOxΔt/C
F
By following formula as can be known, capacitor C
FThe size of value can influence operational amplifier 302 output voltage variation delta V
OUT, through the numerical value after analog/digital converter 304 conversions also influence to some extent simultaneously.In brief, capacitor C
FNumerical value after value and 304 conversions of process analog/digital converter is inverse relation.With table 1 is example, when same surround lighting, i.e. and storage capacitors C
SStored charge Q
OUTPUTWhen being all 4pC, different capacitor C
FValue causes operational amplifier 302 output voltage variation delta V
OUTDifference is therefore also different through the numerical value after analog/digital converter 304 conversions.
Table 1
| Q
OUTPUT |
C
FValue
|
ΔV
OUT=Q
OUTPUT/C
F |
Numerical value (Δ V
OUT/8×1024)
|
| 4pC |
4pF |
1V |
128 |
| 4pC |
0.5pF |
8V |
1024 |
On the contrary, when surround lighting weakens, current i
PHOTODiminish stored charge Q
OUTPUTTail off, also diminish, if suitably select less C through the numerical value after analog/digital converter 304 conversions
FValue can increase through the numerical value after analog/digital converter 304 conversions, avoid low numerical value to make the touched situation of full wafer display panel 102 inductions.It is suitable capacitor C
FValue can make numerical value after the conversion not be subjected to the influence of surround lighting.
As mentioned above, environment light sensor 108 and touch-control sensor 110 are the thin film transistor (TFT) optical inductor, have same process and structure, also can be connected to gate line 118 provides the influence value that reads touch-control sensor 110 required voltage, its value of reading method is identical with said process, so repeat no more.
Below will explain the compensation mechanism of the utility model embodiment under the situation of varying environment light.Please consult Fig. 1 again:
1. when the display device 100 that comprises display panel 102 is in high ambient light, suppose the stored charge Q of touch-control sensor 110 when the user points touch-control not
OUTPUTBe 2pC, if stored charge Q
OUTPUTBe considered as by touch-control when being less than or equal to 1.2pC.
(1). the capacitor C of touch-control/indicative control unit 106 set environment optical inductors 108
FValue is for certain value, 0.5pF for example, and this value is fixing under the situation of any surround lighting.
(2). environment light sensor 108 detecting surround lightings, touch-control/indicative control unit 106 sees through reading unit 104 and reads environment light sensor 108 through first influence value after the analog/digital conversion, and is as shown in table 2.
Table 2
| Q
OUTPUT |
C
FValue
|
ΔV
OUT=Q
OUTPUT/C
F |
First influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 2pC |
0.5pF |
4V |
512 |
High ambient light |
(3). detecting the result as shown in Table 2 is high ambient light, the capacitor C of touch-control/indicative control unit 106 setting touch inductors 110
FValue is an initial value, for example 2pF.
(4). demonstration/touch-control control module 106 sees through reading unit 104 and reads touch-control sensor 110 through second influence value after the analog/digital conversion, and is as shown in table 3.
Table 3
| Q
OUTPUT |
C
FSetting value
|
ΔV
OUT=Q
OUTPUT/C
F |
Second influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 2pC |
2.0pF |
1V |
128 |
Touch-control not |
| 1.2pC |
2.0pF |
0.6V |
76 |
The touch-control threshold value |
(5). as shown in Table 3, be considered as by touch-control when second influence value of touch-control sensor 110 is less than or equal to 76, touch-control sensing control module 106 will be detected the system end that the result exports the display device 100 that comprises display panel 102 to.
2. when the display device 100 of tool display panel 102 is in low ambient light, suppose the stored charge Q of touch-control sensor 110 when the user points touch-control not
OUTPUTBe 0.8pC, if stored charge Q
OUTPUTBe considered as by touch-control when being less than or equal to 0.6pC.
(1). as mentioned above, the capacitor C of environment light sensor 108
FValue is for fixing, and promptly 0.5pF does not need to reset.Environment light sensor 108 detecting surround lightings, touch-control/indicative control unit 106 sees through reading unit 104 and reads environment light sensor 108 through first influence value after the analog/digital conversion, and is as shown in table 4.
Table 4
| Q
OUTPUT |
C
FSetting value
|
ΔV
OUT=Q
OUTPUT/C
F |
First influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 0.8pC |
0.5pF |
1.6V |
204 |
Low ambient light |
(2). as shown in Table 4, the detecting result is a low ambient light, when touch-control/indicative control unit 106 judges that first influence value of environment light sensor 108 is reduced to second threshold value (low ambient light influence value 204) by first threshold (high ambient light influence value 512), the capacitor C of touch-control/indicative control unit 106 setting touch inductors 110
FValue is reduced to 1pF from 2pF, in order to compensate second influence value of following step (3) when reading touch-control sensor 110.
(3). touch-control/indicative control unit 106 sees through reading unit 104 and reads touch-control sensor 110 through second influence value after the analog/digital conversion, and is as shown in table 5.
Table 5
| Q
OUTPUT |
C
FSetting value
|
ΔV
OUT=Q
OUTPUT/C
F |
Second influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 0.8pC |
1pF |
0.8V |
102 |
Touch-control not |
| Q
OUTPUT |
C
FSetting value
|
ΔV
OUT=Q
OUTPUT/C
F |
Second influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 0.6pC |
1pF |
0.6V |
76 |
The touch-control threshold value |
(4). as shown in Table 5, after over-compensation, when being less than or equal to 76, second influence value of touch-control sensor 110 is considered as by touch-control, and identical with the threshold value of high ambient light, can not cause low influence value because of the low current of low ambient light, cause full wafer display panel 102 all to be considered as by touch-control.Touch-control/indicative control unit 106 will be detected the system end that the result exports the display device 100 that comprises display panel 102 to.
3. to be in the environment auroral poles low during as the darkroom when the display device 100 that comprises display panel 102, owing to almost do not have surround lighting, so when finger touch display panel 102, finger can reflect the light of backlight module downwards, shown in Fig. 4 A.Reflect the light of backlight module during touch-control owing to finger, so stored charge Q
OUTPUTHigher during than touch-control not, shown in Fig. 4 B, during with above-mentioned high and low surround lighting, the stored charge Q of touch-control
OUTPUTRatio is the stored charge Q of touch-control not
OUTPUTLow situation is opposite.Suppose the stored charge Q of touch-control sensor 110 when the user points touch-control not
OUTPUTBe 0.3pC, if stored charge Q
OUTPUTBe considered as by touch-control during more than or equal to 0.35pC.
(1). as mentioned above, the capacitor C of environment light sensor 108
FValue still is fixed as 0.5pF, does not need to reset.Environment light sensor 108 detecting surround lightings, touch-control/indicative control unit 106 sees through reading unit 104 and reads environment light sensor 108 through first influence value after the analog/digital conversion, and is as shown in table 6.
Table 6
| Q
OUTPUT |
Touch-control threshold value C
FSetting value
|
ΔV
OUT=Q
OUTPUT/C
F |
First influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 0.3pC |
0.5pF |
0.6V |
76 |
The darkroom |
(2). as shown in Table 6, the result is for being in the darkroom in detecting, when touch-control/indicative control unit 106 judged that the influence value of environment light sensors 108 is reduced to second threshold value (darkroom influence value 76) by first threshold (high ambient light influence value 512 or low ambient light influence value 204), touch-control/indicative control unit 106 was again with the capacitor C of touch-control sensor 110
FValue is reduced to 0.5pF, in order to compensate second influence value of following step (3) when reading touch-control sensor 110.
(3). touch-control/indicative control unit 106 sees through reading unit 104 and reads touch-control sensor 110 through second influence value after the analog/digital conversion, and is as shown in table 7.
Table 7
| Q
OUTPUT |
C
FSetting value
|
ΔV
OUT=Q
OUTPUT/C
F |
Second influence value (Δ V
OUT/8×1024)
|
The detecting result |
| 0.3pC |
0.5pF |
0.6V |
76 |
Touch-control not |
| 0.35pC |
0.5pF |
0.7V |
89 |
The touch-control threshold value |
(4). as shown in Table 7, after over-compensation, when second influence value of touch-control sensor 110 is considered as by touch-control more than or equal to 89 the time.Touch-control sensing control module 106 will be detected the system end that the result exports the display device 100 that comprises display panel 102 to.
Table 8 is that more identical touch-control action reaches under varying environment light before and after the compensation, second influence value after touch-control sensor 110 process reading units 104 analog/digital conversion.As can be known, low ambient light and darkroom are in the capacitor C of touch-control sensor 110 from table
FValue is constant to be under the uncompensated situation, and influence value is respectively 36 and 22, causes the situation of full wafer display panel 102 induction touch-controls easily.In the capacitor C of suitably adjusting touch-control sensor 110
FAfter value was compensated, second influence value rose to 76 and 89 respectively, can avoid the problems referred to above to take place.
Table 8
What specify is, the capacitor C of above-mentioned compensation mechanism touch-control sensor 110 during with high ambient light
FValue is an initial value, when surround lighting is changed into low ambient light or darkroom, and the capacitor C of touch-control sensor 110 during with low ambient light
FValue is initial value, and when low ambient light was changed into the darkroom, compensation mechanism was the capacitor C that downgrades touch-control sensor 110
FValue avoids second influence value low excessively to improve second influence value, causes full wafer display panel 102 to be considered as by touch-control.Opposite, if the capacitor C of touch-control sensor 110 during with low ambient light
FValue is initial value, when surround lighting is changed into high ambient light, and the capacitor C of touch-control sensor 110 during with the darkroom
FValue is initial value, when surround lighting is changed into low ambient light or high ambient light, that is to say that when touch-control/indicative control unit 106 judged that first influence value of environment light sensor 108 increases to second threshold value by first threshold, compensation mechanism was then for increasing the capacitor C of touch-control sensor 110
FValue avoids display panel 102 by behind the touch-control to reduce by second influence value, still have the second too high influence value cause induction less than situation take place, its compensation process is similar to the above, repeats no more.
At least one can reach the purpose of the detecting surround lighting of the utility model embodiment the quantity of environment light sensor 108, yet can do different configurations according to actual demand.Framework with Fig. 1 is an example, respectively at four corners of display panel 102 environment light sensor 108 is set, be about to display panel 102 and be divided into four zones, as shown in Figure 5, this moment can be respectively at touch-control sensor in each zone (as Fig. 1 110) capacitor C
FValue is done different the adjustment, so that different compensation are done in each zone.Compensate process flow diagram as shown in Figure 6:
Among the step S610, the initial capacitor C of set environment optical inductor and touch-control sensor
FValue:
Among the step S620, read first influence value of four regional environment optical inductors;
Among the step S630, judge whether surround lighting changes, when changing as if surround lighting, execution in step S640, when not changing as if surround lighting, execution in step S650;
Among the step S640,, adjust the capacitor C of touch-control sensor in each zone respectively according to the height of each regional environment light
FValue;
Among the step S650, read second influence value of each regional touch-control sensor; And
Among the step S660, export second influence value to system end.
The thin film transistor (TFT) optical inductor of the display device that the utility model provides by utilizing same process and structure be as the light detection element, but be divided into two kinds of different purposes: the one, and environment light sensor is in order to the power of detecting surround lighting; The 2nd, touch-control sensor is in order to the detecting position of touch.When environment light sensor detecting surround lighting changed, second influence value of compensating touch control inductor so that second influence value meets correct touch detection standard after compensation, avoided the power of surround lighting to cause the touch detection mistake or detect bad problem generation.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.