LIGHT SENSING TOUCH PANEL AND LOW-POWER DRIVING CONTROL METHOD THEREOF

Abstract

Provided is a low-power driving control method of a light sensing touch panel, which includes the following steps: measuring an ambient light field intensity of the light sensing touch panel and outputting a light field intensity signal; outputting an amplification signal adapting to a touch signal according to the light field intensity signal; amplifying the touch signal according to the amplification signal and driving the light sensing touch panel. A light sensing touch panel is also disclosed. The light sensing touch panel and the low-power driving control method can reduce the power consumption of the touch panel without affecting the touch sensitivity.

Claims

1. A low-power driving control method of a light sensing touch panel, which comprises the following steps: measuring an ambient light field intensity of the light sensing touch panel and outputting a light field intensity signal; outputting an amplification signal adapting to a touch signal according to the light field intensity signal, which comprises the following steps: a step of a driving circuit of the light sensing touch panel being turned on when there is no touch and being turned off when there is touch; a step of determining if the light field intensity signal is larger than a predetermined value of a stored light field intensity signal, such that if it is YES, a first magnification of stored amplification value is selected to adapt to the touch signal; and if it is No, a second magnification of stored amplification value is selected to adapt to the touch signal; wherein the first magnification is larger than the second magnification; and a step of adjusting the amplification value to adapt to the touch signal; and amplifying the touch signal according to the amplification signal, and driving the light sensing touch panel.

2. A low-power driving control method of a light sensing touch panel, which comprises the following steps: measuring an ambient light field intensity of the light sensing touch panel and outputting a light field intensity signal; outputting an amplification signal adapting to a touch signal according to the light field intensity signal; and amplifying the touch signal according to the amplification signal and driving the light sensing touch panel.

3. The low-power driving control method of the light sensing touch panel as claimed in claim 2, wherein the step of outputting an amplification signal adapting to a touch signal according to the light field intensity signal comprises the following steps: a step of a driving circuit of the light sensing touch panel being turned on when there is no touch and being turned off when there is touch; and a step of determining if the light field intensity signal is larger than a predetermined value of a stored light field signal, such that if it is YES, a first magnification of stored amplification value is selected to adapt to the touch signal; and if it is No, a second magnification of stored amplification value is selected to adapt to the touch signal; wherein the first magnification is larger than the second magnification.

4. The low-power driving control method of the light sensing touch panel as claimed in claim 2, wherein the step of outputting an amplification signal adapting to a touch signal according to the light field intensity signal further comprises: a step of adjusting the amplification value to adapt to the touch signal.

5. The low-power driving control method of the light sensing touch panel as claimed in claim 2, wherein the step of outputting an amplification signal adapting to a touch signal according to the light field intensity signal comprises the following steps: a step of a driving circuit of the light sensing touch panel being turned off when there is no touch and being turned on when there is touch; and a step of determining if the light field intensity signal is larger than a predetermined value of a stored light field signal, such that if it is YES, a first magnification of stored amplification value is selected to adapt to the touch signal; and if it is No, a second magnification of stored amplification value is selected to adapt to the touch signal; wherein the first magnification is smaller than the second magnification.

6. The low-power driving control method of the light sensing touch panel as claimed in claim 2, wherein the step of outputting an amplification signal adapting to a touch signal according to the light field intensity signal further comprises: a step of adjusting the amplification value to adapt to the touch signal.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a first flow diagram of the low-power driving control method of light sensing touch panel according to the present invention;

[0022] FIG. 2 is a second flow diagram of the low-power driving control method of light sensing touch panel according to the present invention;

[0023] FIG. 3 is a schematic view illustrating the structure of the driving circuit of the light sensing touch panel according to the present invention;

[0024] FIG. 4 is a circuit diagram of the driving circuit of the light sensing touch panel according to the present invention; and

[0025] FIG. 5 is a schematic view illustrating the use of the photosensitive type in-cell touch technology according to the existing technology.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] A clear and complete description of the technical solution according to the embodiment of the present invention will be given as follows accompanying with the drawings. Apparently, the embodiments described below show only example embodiments of the present invention and not all embodiments. For those having ordinary skills in the art, other embodiments obtained from these drawings without paying any creative effort are considered encompassed in the scope of protection defined by the clams of the present invention.

[0027] Referring to FIGS. 1 and 2, it shows the flow diagram of the low-power driving control method of light sensing touch panel according to the present invention.

[0028] The low-power driving control method of light sensing touch panel according to the present invention mainly comprises the step S204 of the driving circuit of the light sensing touch panel being turned on when there is no touch and being turned off when there is touch, which specifically comprises the following steps: [0029] S10, measuring the ambient light field intensity of the light sensing touch panel, and outputting a light field signal; [0030] S20, outputting an amplification signal adapting to a touch signal according to the intensity of the light field signal; and [0031] S30, amplifying the touch signal according to the amplification signal, and driving the light sensing touch panel.

[0032] In step 10, the function of measuring the ambient light field intensity of the light sensing touch panel is as follows. Because the signal to noise ratio of the touch signal of the light sensing touch panel is greatly affected by ambient light field, in regard to the driving circuit of the light sensing touch panel being turned on when there is no touch and being turned off when there is touch, the signal to noise ratio of the touch signal is higher when the intensity of the ambient light field is larger, and the signal to noise ratio of the touch signal is poor when the intensity of the ambient light field is weaker. Namely, the signal to noise ratio of the touch signal changes with the light field intensity. By measuring the ambient light field intensity of the light sensing touch panel, it can obtain the signal to noise ratio of the touch signal, and output the light field signal.

[0033] Referring to FIG. 2, the step S20 further comprises: step S201, considering if the intensity of the light field signal is larger than the predetermined value of the stored light field signal, if it is YES, indicating that the light field signal is larger, then proceeding with the step S202 of choosing a first magnification from the stored amplification value to adapt to the touch signal; when considering if the intensity of the light field signal is not larger than the predetermined value of the stored light field signal, then proceeding with the step S203 of choosing a second magnification from the stored amplification value to adapt to the touch signal; wherein, the step S20 further comprises step S205 of the first magnification being larger than the second magnification.

[0034] In the present embodiment, the function of the first magnification being larger than the second magnification is as follows. When the light field signal is stronger, indicating that the external ambient light or background light is higher and the signal to noise ratio thereof is relatively low, such as 10 dB, then the larger magnification adapt to the touch signal, which allows the signal to noise ratio to achieve an appropriate level, such as 5 dB. When the light field signal is weaker, indicating that the external ambient light or background light is lower and the signal to noise ratio thereof is relatively high, such as 40 dB-50 dB, then the smaller magnification adapt to the touch signal, which allows the signal to noise ratio to achieve an appropriate level, such as 15 dB. Namely, make judgments according to the intensity of the light field, and choose an appropriate magnification to adapt to the touch signal, which can avoid the problems of too large magnification leading to the increase of the power consumption, or too less magnification leading to low sensitivity of the light sensing touch panel especially in the light field with larger signal to noise ratio.

[0035] Specifically, it can adjust the magnification value to adapt to the touch signal. For example, increasing or decreasing the magnification value through an external switch, and outputting an appropriate magnification to adapt to the touch signal, can also achieve the same technical effects.

[0036] In an another embodiment of the step S20, which is mainly applied in the step S204 of the driving circuit of the light sensing touch panel being turned on when there is no touch and being turned off when there is touch, the selected magnification value is contrary to the first embodiment mentioned above. Specifically, consider if the intensity of the light field signal is larger than the predetermined value of the stored light field signal, if it is YES, choose a first magnification from the stored amplification value to adapt to the touch signal; if it is No, choose a second magnification from the stored amplification value to adapt to the touch signal; wherein, the step S20 further comprises step S205 of the first magnification being smaller than the second magnification.

[0037] Step S30, adjust the amplification value to adapt to the touch signal to drive the light sensing touch panel.

[0038] In the low-power driving control method of light sensing touch panel according to the present embodiment, it chooses the amplification value of the touch signal of the light sensing touch panel according to the intensity of ambient light, and further reduces the power consumption of the light sensing touch panel

[0039] Referring to FIGS. 3 and 4, they are the embodiments of the driving circuit of the light sensing touch panel according to the present invention.

[0040] The light sensing touch panel according to the present embodiment comprises a driving circuit. The driving circuit is turned on when there is no touch on the light sensing touch panel and is turned off when there is touch on the light sensing touch panel.

[0041] The driving circuit at least comprises: a light sensor 1, which is used to measure the ambient light field intensity of the light sensing touch panel and output a light field signal; a touch signal amplifying controller 2, which is used to output an amplification signal adapting to a touch signal according to the intensity of the light field signal; and an amplifier 3, which is used to amplify the touch signal according to the amplification signal and drive the light sensing touch panel. Wherein, the light sensor 1, the touch signal amplifying controller 2, and the amplifier 3 are connected in sequence.

[0042] The function of the light sensor 1 is to measure the ambient light field intensity of the light sensing touch panel. Because the signal to noise ratio of the touch signal of the light sensing touch panel is greatly affected by ambient light field, in regard to the driving circuit of the light sensing touch panel being turned on when there is no touch and being turned off when there is touch, the signal to noise ratio of the touch signal is higher when the intensity of the ambient light field is larger, and the signal to noise ratio of the touch signal is poor when the intensity of the ambient light field is weaker. Namely, the signal to noise ratio of the touch signal changes with the light field intensity. By measuring the ambient light field intensity of the light sensing touch panel, it can obtain the signal to noise ratio of the touch signal, and output the light field signal.

[0043] Furthermore, the touch signal amplifying controller 2 comprises: a storage 21, which is used to store the amplification value; a determiner 22, which is used to consider the intensity of the light field signal according to the light field signal; a selection controller 23, which is used to choose a magnification adapting to the touch signal, the storage 21 and the determiner 22 being respectively connected with the selection controller 23. Wherein, the determiner 22 considers if the intensity of the light field signal is larger than the predetermined value of the stored light field signal, if it is YES, indicating the light field signal is stronger, the selection controller 23 chooses a first magnification from the amplification value stored in the storage 21 to adapt to the touch signal; if the determiner 22 considers that the intensity of the light field signal is not larger than the predetermined value of the stored light field signal, the selection controller 23 chooses a second magnification from the amplification value stored in the storage 21 to adapt to the touch signal; wherein, the first magnification is larger than the second magnification.

[0044] In the present embodiment, the function of the first magnification being larger than the second magnification, which is selected by the touch signal amplifying controller 2, is as follows. When the light field signal is stronger, indicating that the external ambient light or background light is higher and the signal to noise ratio thereof is relatively low, such as 10 dB, then the larger magnification adapt to the touch signal, which allows the signal to noise ratio to achieve an appropriate level, such as 5 dB. When the light field signal is weaker, indicating that the external ambient light or background light is lower and the signal to noise ratio thereof is relatively high, such as 40 dB-50 dB, then the smaller magnification adapt to the touch signal, which allows the signal to noise ratio to achieve an appropriate level, such as 15 dB. Namely, the selection controller 23 of the touch signal amplifying controller 2 can make judgments according to the intensity of the light field, and choose an appropriate magnification to adapt to the touch signal, which can avoid the problems of too large magnification leading to the increase of the power consumption, or too less magnification leading to low sensitivity of the light sensing touch panel especially in the light field with larger signal to noise ratio.

[0045] Furthermore, the touch signal amplifying controller 2 is further connected with an external switch 4 used to adjust the amplification value to adapt to the touch signal. By adjusting the external switch 4, the touch signal amplifying controller 2 chooses the amplification value to adapt to the touch signal, and outputs an amplification signal adapting to the touch signal.

[0046] In addition, the driving circuit further comprises a photodiode 5 connected to the amplifier. The function of the photodiode 5 is to convert the driving circuit, so that the driving circuit can be turned off when there is no touch on the light sensing touch panel and is turned on when there is touch on the light sensing touch panel. In the embodiment, the magnification value selected by the touch signal amplifying controller 2 is contrary to the embodiment mentioned above. Specifically, the determiner 22 considers if the intensity of the light field signal is larger than the predetermined value of the stored light field signal, if it is YES, the selection controller 23 chooses a first magnification from the amplification value stored in the storage 21 to adapt to the touch signal; if the determiner 22 considers that the intensity of the light field signal is not larger than the predetermined value of the stored light field signal, the selection controller 23 chooses a second magnification from the amplification value stored in the storage 21 to adapt to the touch signal; wherein, the first magnification is smaller than the second magnification. In the embodiment, the structure of the light sensor 1, the touch signal amplifying controller 2, and the amplifier 3 provided in the driving circuit can still achieve the same technical effect as the above embodiment.

[0047] The light sensing touch panel and the low-power driving control method thereof according to the embodiment of the present invention have the following beneficial effects. Because the light sensor can measure the ambient light field intensity of the light sensing touch panel and output the light field signal to the touch signal amplifying controller, the touch signal amplifying controller outputs an amplification signal adapting to the touch signal according to the intensity of the light field signal, the amplifier amplifies the touch signal according to the amplification signal and drives the light sensing touch panel, which avoids the high power consumption problems of the touch panel resulted from using the default magnification to amplify the signal. It can reduce the power consumption of the touch panel without affecting the touch sensitivity.