TWI507946B - Touch sensing panel and sensing circuit therein - Google Patents

Description

Touch sensing panel and sensing circuit therein

The present invention relates to a touch sensing panel, and more particularly to a sensing circuit in a touch sensing panel.

Generally speaking, in the case of a light-sensitive touch display, the light sensor is mainly used to generate a corresponding induced current according to different illumination intensity, and the difference in magnitude between different induced currents is used as the light intensity of the light sensor. Based on the judgment of the touch. For example, in the case of a finger touch, ambient light illumination, and light pen touch, the light sensor respectively generates different induced currents, and when the light intensity received by the light sensor is large, the induced current also follows. Increased, and different inductive currents can be converted to output voltages via the integrator circuit, thereby determining whether there is a touch operation.

However, in the touch display panel, the reset potential received by the touch sensing circuit is different due to the RC loading effect in the panel, thereby giving a reset potential at the end of the signal transmission path. And the reset potential at the front end of the signal transmission path has a different level, so that when the reset potential is applied to the touch sensing circuit and the subsequent output voltage is generated When the output voltage at the front end of the signal transmission path is greater than the output voltage at the end of the signal transmission path, a situation in which the touch operation is misjudged occurs.

The present invention relates to a touch sensing panel and a sensing circuit therefor, thereby improving the occurrence of a misjudgment of the touch operation.

One aspect of the present invention is directed to an inductive circuit that includes an energy storage unit, a light sensing unit, and a charging unit. The light sensing unit is electrically coupled to the energy storage unit for sensing a first color light, and displaying a corresponding conduction state according to the sensed intensity of the first color light to control discharge of the energy storage unit, and The energy storage unit is reset according to a control signal being turned on. The charging unit is electrically coupled to the energy storage unit and charges the energy storage unit during the resetting of the energy storage unit.

In an embodiment of the invention, the charging unit is controlled by a voltage stored by the energy storage unit to selectively charge the energy storage unit.

In another embodiment of the present invention, the energy storage unit further includes a capacitor element, and the charging unit further includes at least one switching element, wherein the switching element is configured to conduct the capacitor element and a supply voltage according to the voltage stored by the capacitor element.

In a second embodiment of the present invention, the charging unit further includes at least one light sensing component for sensing a second color light, and the light sensing unit generates a leakage current according to the second color light. The intensity of the two color lights produces a corresponding compensation current.

Another aspect of the present disclosure is directed to a touch sensing panel including a plurality of sensing circuits, and each of the foregoing sensing circuits Contains capacitive elements, optoelectronic crystals, and charging cells. The photoelectric crystal is electrically coupled to the capacitor element at an operation node for sensing the intensity of a first color light and exhibiting a corresponding conduction state, so that the capacitor element is discharged through the photoelectric crystal, wherein the photoelectric crystal system is controlled by a control signal Turning on, the capacitive element is reset through the photoelectric crystal. The charging unit is electrically coupled to the capacitive element at the operating node, and turns on the capacitive element and a supply voltage during the resetting of the capacitive element.

In an embodiment of the invention, the charging unit further includes a switching component having a control end, a first end, and a second end, wherein the control end and the second end are electrically coupled to the capacitive element at the operating node, first The terminal is used to electrically couple the supply voltage.

In another embodiment of the invention, the charging unit further includes a first switching element and a second switching element. The first switching element has a control end, a first end and a second end, wherein the control end is electrically coupled to the capacitive element at the operating node, and the first end is configured to electrically couple the supply voltage. The second switching element has a control end, a first end and a second end, wherein the control end and the second end are electrically coupled to the capacitive element at the operating node, and the first end is electrically coupled to the second end of the first switching element end.

In a second embodiment of the present invention, the charging unit further includes a first switching element and a second switching element. The first switching element has a control end, a first end and a second end, wherein the control end is electrically coupled to the capacitive element at the operating node, and the first end is configured to electrically couple the supply voltage. The second switching element has a control end, a first end and a second end, wherein the control end and the first end are electrically coupled to the second end of the first switching element, and the second end is electrically coupled to the capacitive element On the operation node.

In another embodiment of the present invention, the touch sensing panel further includes a color filter, the color filter includes a plurality of color resists, wherein the color resist further comprises a first color resist having a first color and a first color One of the two colors is a second color resist, the first color resist corresponds to the photonic crystal configuration, and the second color resist corresponds to the charging unit configuration.

In another embodiment of the present invention, the touch sensing panel further includes a color filter, the color filter includes a plurality of color resists, wherein the color resist further comprises a first color resist and a second color resist, the first color The resistance corresponds to the configuration of the photoelectric crystal, and the second color resistance corresponds to the configuration of the charging unit. The charging unit further includes at least one light sensing component, wherein the light sensing component senses a second color light through the second color resist to generate a corresponding compensation current to compensate the photoelectric crystal to pass the first color resist according to the second color Leakage current generated by light.

It can be seen from the above that the application of the foregoing embodiments of the present invention can effectively improve the situation that the induced output signal is incorrect due to the RC loading effect, thereby preventing the occurrence of misjudgment of the touch operation and improving the specific color. The problem of leakage current is prevented by the operation of the light of different color light pens, so as to avoid affecting the generation of normal touch signals.

This summary is intended to provide a simplified summary of the disclosure This Summary is not an extensive overview of the disclosure, and is intended to be illustrative of the embodiments of the invention.

100‧‧‧ touch sensor panel

110‧‧‧gate driver

120, 120a~120g‧‧‧Induction circuit

210, 210a‧‧‧ energy storage unit

220, 220a‧‧‧Light sensing unit

230, 230a~230c‧‧‧Charging unit

1 is a schematic diagram of a touch sensing panel according to an embodiment of the invention; FIG. 2 is a block diagram showing a circuit of a sensing circuit in the touch sensing panel according to the first embodiment of the present invention; 3 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a first embodiment of the present invention; and FIG. 4 is a schematic circuit diagram shown in FIG. 2 according to a second embodiment of the present invention. FIG. 5 is a schematic circuit diagram of a sensing circuit as shown in FIG. 2 according to a third embodiment of the present invention; FIG. 6 is a schematic diagram showing a comparison of spectrum of an LED light pen and color resistance; FIG. 8 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a fourth embodiment of the present invention; FIG. 8 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a fifth embodiment of the present invention; FIG. 9 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a sixth embodiment of the present invention; and FIG. 10 is a diagram showing a second embodiment according to the seventh embodiment of the present invention. Circuit diagram of the sensing circuit Figure.

The following is a detailed description of the embodiments with reference to the drawings, but The embodiments are not intended to limit the scope of the present invention, and the description of the operation of the structure is not intended to limit the order of execution thereof. Any device that is recombined by components and produces equal devices is the present invention. The scope covered. In addition, the drawings are for illustrative purposes only and are not drawn to the original dimensions. For ease of understanding, the same elements in the following description will be denoted by the same reference numerals.

The terms used in the entire specification and the scope of the patent application, unless otherwise specified, generally have the ordinary meaning of each term used in the field, the content disclosed herein, and the particular content. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of the disclosure.

As used herein, "about", "about" or "substantially" generally means that the error or range of the index value is within 20%, preferably within 10%, and more preferably It is within 5 percent. In the text, unless otherwise stated, the numerical values referred to are regarded as approximations, such as an error or range indicated by "about", "about" or "substantial", or other approximations.

The terms "first", "second", etc., as used herein, are not intended to refer to the order or the order, and are not intended to limit the invention, only to distinguish the elements described in the same technical terms. Or just operate.

Secondly, the terms "including", "including", "having", "containing", and the like, as used herein, are all open terms, meaning, but not limited to.

In addition, the term "coupled" or "connected" as used herein may mean that two or more elements are in direct physical or electrical contact with each other, or indirectly in physical or electrical contact with each other, or Multiple components operate or act upon each other.

FIG. 1 is a schematic diagram of a touch sensing panel according to an embodiment of the invention. As shown in FIG. 1 , the touch sensing panel 100 includes a gate driver 110 and a plurality of sensing circuits 120 , wherein the gate driver 110 transmits a corresponding gate driving signal through a signal transmission line (eg, a scanning line or a selection line). (eg, gate drive signals G _n , G _n+1 , G _n+2 , ..., etc.) and selection signals (eg, selection signals S _n , S _n+1 , S _n+2 , ..., etc.) ) respectively, to the corresponding sensing circuit 120, so that the sensing circuit 120 generates a corresponding output signal (eg, output signals D ₁ , D ₂ , ..., etc.) according to the gate driving signal and the selection signal in cooperation with the touch sensing operation. Determine if the touch operation is in progress.

It should be noted that, according to different implementation manners and aspects, the touch sensing panel 100 may further include other circuits or components (eg, a data driver, a display pixel, a read circuit for interpreting an output signal, ... Etc., however, for convenience and clarity of description, FIG. 1 is only illustrative of a portion of the circuits and components, but is not intended to limit the invention.

FIG. 2 is a block diagram showing the circuit of the sensing circuit in the touch sensing panel shown in FIG. 1 according to an embodiment of the invention. As shown in FIG. 2, at least one or each of the foregoing sensing circuits 120 may include an energy storage unit 210, a light sensing unit 220, and a charging unit 230, wherein the light sensing unit 220 is electrically coupled to the energy storage device. The unit 210 is configured to sense the first color light, and display a corresponding conduction state according to the intensity of the sensed first color light to control the discharge of the energy storage unit 210, and is configured to be driven according to a control signal (eg, gate drive) The signal G _n+1 ) is turned on to reset the energy storage unit 210. The charging unit 230 is electrically coupled to the energy storage unit 210 and charges the energy storage unit 210 during the resetting of the energy storage unit 210.

The sensing circuit 120 can also include a switching element MR, wherein the switching element MR is electrically coupled to the energy storage unit 210 and is controlled by the gate driving signal G _{n to} be turned on, so that the voltage stored in the energy storage unit 210 can be changed. The output is output via the switching element MR as an output signal D _n for interpretation. In practice, the switching element MR can be an NMOS transistor or a PMOS transistor according to actual needs.

In operation, in the case that the light sensing unit 220 is illuminated, the light sensing unit 220 is turned on according to the intensity of the perceived light, and the energy storage unit 210 is discharged through the light sensing unit 220 according to the degree of the light sensing unit 220 being turned on. such that the change in the voltage of the energy storage unit 210 may be stored as the output signal of the D _n for interpretation via the output switching element MR. On the other hand, in the case that the light sensing unit 220 is not illuminated, the light sensing unit 220 is turned on according to the gate driving signal G _n+1 , and charges the energy storage unit 210 by the selection signal S _n+1 . At the same time, the charging unit 230 also charges the energy storage unit 210 by the power signal according to the control signal being turned on, so that the energy storage unit 210 can be charged to have the required reset potential.

In this way, for the sensing circuit 120 at the end of the signal transmission path, when the energy storage unit 210 is unable to be reset to a certain voltage level by the light sensing unit 220 due to the RC loading effect In the case of the bit, the energy storage unit 210 can still be charged by the charging unit 230, so that the energy storage unit 210 can still be charged to have the required reset potential, and the reset potential at the front end and the end of the signal transmission path is prevented from being subjected to the resistive capacitive load. The (RC loading) effect causes the sensing output signals to be different, thereby preventing the occurrence of misjudgment of the touch operation.

The operation of resetting the energy storage unit 210 as described above mainly refers to charging the energy storage unit 210 to a certain potential (for example, a reset potential) when the light sensing unit 220 is not illuminated. The energy storage unit 210 can be discharged through the light sensing unit 220 according to the intensity of the light perceived by the light sensing unit 220 when the touch operation is performed.

In an embodiment, the energy storage unit 210 may include a capacitive element, and the light sensing unit 220 may include a light sensing element (eg, a photoelectric crystal). Secondly, the control signal received by the charging unit 230 may be a pixel control signal, a scan driving signal, a selection signal or a voltage signal on other corresponding operating nodes in the circuit; in other words, those skilled in the art may adopt the Any signal of the charging unit 230 is turned on at an appropriate point in time. Similarly, the power signal received by the charging unit 230 can also be a pixel control signal, a scan driving signal, a selection signal, or a DC voltage signal. In other words, those skilled in the art can use the energy storage unit 210 according to actual needs. Any signal to charge.

FIG. 3 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to the first embodiment of the present invention. As shown in FIG. 3, in the sensing circuit 120a, the energy storage unit 210a includes a capacitive element C1, and the light sensing unit 220a includes a photoelectric crystal MP, wherein the photoelectric crystal MP is electrically coupled to the capacitive element C1 at the operating node Va and used to Sensing the intensity of the first color light to exhibit a corresponding conduction state (for example, when the light intensity is large, the conduction current flowing through the photoelectric crystal MP is correspondingly increased, and when the light intensity is small, the conduction current flowing through the photoelectric crystal MP is correspondingly (Reduced), the capacitive element C1 is discharged through the photo-optical crystal MP. Secondly, the photo-crystal system is controlled by a control signal (eg, gate drive signal G _n+1 ), so that the capacitor element C1 is reset through the optoelectronic crystal MP, and the signal S _{n+ is} selected during the reset process. ₁ Charge. The charging unit 230a is electrically coupled to the capacitive element C1 at the operating node Va, and turns on the capacitive element C1 and a supply voltage V _D during the resetting of the capacitive element C1, so that the charging unit 230a is charged by the selection signal Sn ₊₁ . At the same time, charging is also performed by the supply voltage V _D to ensure that the capacitive element C1 can be charged to have the desired reset potential.

In an embodiment, the charging unit 230a is controlled by the voltage stored by the energy storage unit 210a to selectively charge the energy storage unit 210a. As shown in FIG. 3, the charging unit 230a further includes at least one switching element (such as the switching element M1). The switching element M1 has a control end, a first end and a second end, wherein the control end of the switching element M1 The second end is electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M1 is electrically coupled to the supply voltage V _D .

In practice, the photo transistor MP and the switching element M1 may be an NMOS transistor or a PMOS transistor according to different control modes and circuit connection modes. Taking the switching element M1 as an NMOS transistor as an example, the gate and the source of the switching element M1 are electrically coupled to the capacitive element C1 at the operating node Va, and the drain of the switching element M1 is electrically coupled to the supply voltage V. _D.

Here, in the case where the voltage V _C coupled to one end of the capacitive element C1 is a constant value, the voltage change of the operating node Va may correspond to the voltage change stored by the capacitive element C1; in other words, the switching element M1 may be equivalent to The voltage stored by the capacitive element C1 is controlled or equivalent to the voltage of the operating node Va.

In operation, in the case where the photoelectric crystal MP is illuminated, the photoelectric crystal MP is turned on according to the intensity of the perceived light, and the capacitive element C1 is discharged through the photoelectric crystal MP according to the degree of conduction of the photoelectric crystal MP, and the switching element MR is driven by the gate at this time. control signal G _n is turned on, so that the variation of the voltage stored in the capacitance element C1 as the output signal D _n for interpretation via the output switching element MR.

Next, when the capacitive element C1 is to be charged, the photo transistor MP is controlled to be turned on by the gate driving signal Gn ₊₁ , and the selection signal Sn ₊₁ is transmitted to the capacitive element C1 via the phototransistor MP to charge the capacitive element C1. At this time, in the case where the voltage stored in the capacitive element C1 (or the voltage of the operating node Va) is charged to a certain voltage level by the selection signal S _n+1 , the switching element M1 is controlled by the voltage stored by the capacitive element C1 and correspondingly The capacitive element C1 is electrically connected to the supply voltage V _D such that the capacitive element C1 can be simultaneously charged by the supply voltage V _D via the switching element M1.

4 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to a second embodiment of the present invention. In contrast to the embodiment shown in FIG. 3, in the sensing circuit 120b shown in FIG. 4, the charging unit 230b includes switching elements M2 and M3. The switching element M2 has a control end, a first end and a second end, wherein the control end of the switching element M2 is electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M2 is electrically coupled Supply voltage V _D . In addition, the switching element M3 has a control end, a first end and a second end, wherein the control end and the second end of the switching element M3 are electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M3 The second end of the switching element M2 is electrically coupled.

Compared with the embodiment shown in FIG. 3, since the charging unit 230b further includes the switching element M2, the switching element M2 can be further used as a switch for regulating the supply voltage V _D to ensure that the photoelectric crystal MP is not used for illumination. Charging action.

In practice, the switching elements M2, M3 may be NMOS transistors or PMOS transistors according to different control modes and circuit connection modes. Taking the switching elements M2 and M3 as NMOS transistors as an example, the gate of the switching element M2 and the gate and source of the switching element M3 are electrically coupled to the capacitive element C1 at the operating node Va, and the drain of the switching element M2 is used. electrically coupled to the supply voltage V _D, a source electrically coupled to the drain of the switching element M2 is connected to the switching element M3 pole. In addition, taking the switching elements M2 and M3 as PMOS transistors as an example, the circuit connection manner can be similar to the foregoing, and only the voltage setting is different, and thus will not be described herein. Further, the size of the switching elements M2, M3 is smaller than the size of the photo transistor MP in terms of the size of the actual implementation.

Similarly, in operation, in the case of a phototransistor MP by illumination of the capacitive element C1 based on the degree of photo transistor MP is turned on it through a phototransistor MP discharge switching element MR driving signal G _n is controlled by the gate is turned on so that the capacitive element the change in the voltage stored in C1 as the output signal D _n MR element via the switching output for interpretation. Next, in the case where the photo-crystal MP is not illuminated, the photo-crystal MP is controlled to be turned on by the gate driving signal G _n+1 , and the selection signal S _n+1 is transmitted to the capacitive element C1 via the photo-crystal MP to the capacitive element C1. Charging, at this time, in the case where the voltage stored in the capacitive element C1 (or the voltage of the operating node Va) is charged to a certain voltage level by the selection signal S _{n+1 , the} voltages of the switching elements M2 and M3 stored by the capacitive element C1 The capacitive element C1 and the supply voltage V _D are controlled to be turned on accordingly, so that the capacitive element C1 can be simultaneously charged by the supply voltage V _D via the switching elements M2 and M3.

FIG. 5 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to a third embodiment of the present invention. In contrast to the embodiment shown in FIG. 3, in the sensing circuit 120c shown in FIG. 5, the charging unit 230b includes switching elements M4 and M5. The switching element M4 has a control end, a first end and a second end, wherein the control end of the switching element M4 is electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M4 is electrically coupled Supply voltage V _D . In addition, the switching element M5 has a control end, a first end and a second end, wherein the control end and the first end of the switching element M5 are electrically coupled to the second end of the switching element M4, and the second end of the switching element M5 The capacitive coupling element C1 is electrically coupled to the operating node Va.

In practice, the switching elements M4, M5 may be NMOS transistors or PMOS transistors according to different control methods and circuit connections. Taking the NMOS transistors as the switching elements M4 and M5 as an example, the gate of the switching element M4 is electrically coupled to the capacitive element C1 at the operating node Va, and the drain of the switching element M4 is electrically coupled to the supply voltage V _D , the switch The gate and the drain of the component M5 are electrically coupled to the source of the switching element M4. The source of the switching component M5 is electrically coupled to the capacitive component C1 at the operating node Va. In addition, taking the switching elements M4 and M5 as PMOS transistors as an example, the circuit connection manner can be similar to the foregoing, and only the voltage setting is different, so no further details are provided herein. Further, the size of the switching elements M4, M5 is smaller than the size of the photo transistor MP in terms of the size of the actual implementation.

Similarly, in operation, in the case of a phototransistor MP by illumination of the capacitive element C1 based on the degree of photo transistor MP is turned on it through a phototransistor MP discharge switching element MR driving signal G _n is controlled by the gate is turned on so that the capacitive element the change in the voltage stored in C1 as the output signal D _n MR element via the switching output for interpretation. Next, when the capacitive element C1 is to be charged, the photo transistor MP is controlled to be turned on by the gate driving signal Gn ₊₁ , and the selection signal Sn ₊₁ is transmitted to the capacitive element C1 via the phototransistor MP to charge the capacitive element C1. At this time, in a case where the voltage stored in the capacitive element C1 (or the voltage of the operating node Va) is charged to a certain voltage level by the selection signal S _n+1 , the switching element M4 is controlled by the voltage stored by the capacitive element C1 and correspondingly The ground is turned on, and the switching element M5 is also turned on according to the operation of the switching element M4, thereby turning on the capacitive element C1 and the supply voltage V _D so that the capacitive element C1 can be simultaneously charged by the supply voltage V _D via the switching elements M2 and M3.

On the other hand, in the embodiment shown in FIG. 1 , the touch sensing panel 100 further includes a color filter 150 , wherein the color filter 150 is disposed relative to the substrate where the sensing circuit 120 is located, and the color filter is configured. The light sheet 150 includes a plurality of color resists (such as the red, green, and blue color resists shown in the following embodiments) for the light emitted by the backlight to penetrate to provide a display image. Red, green or blue light.

However, since the color filter covers a large spectral range, in the case where the color filter 150 is disposed relative to the sensing circuit 120, when the light sensing unit (or the photoelectric crystal) receives a light source of a specific color (eg, : Single-color LED light pen) When lighting and performing touch operation, there will be a situation of mixed colors, which may cause misjudgment of touch operation.

For example, FIG. 6 is a schematic diagram showing a comparison of spectrums between an LED light pen and a color resistor, wherein CF_R, CF_G, and CF_B represent spectral ranges in which red, green, and blue color resists respectively, and LED_R, LED_G, and LED_B represent red, respectively. The spectrum range in which the green, blue LED stylus emits light. It can be seen from Fig. 6 that because the spectral range of the LED light pen and the color resistance overlaps greatly, when the light sensing unit is configured with respect to the blue color resistance, the light of the green light pen passes through the blue color resistance, so that the light sensing unit is based on The light of the green light pen generates leakage current, which causes a misjudgment of the touch. In addition, when the light sensing unit is configured with respect to the red color resist, the light of the blue light pen passes through the red color resist, so that the light sensing unit is based on the blue light pen. The light generates a leakage current, causing a misjudgment of the touch; secondly, when the light sensing unit is configured with respect to the green color resist, the light of the red light pen passes through the green color resist, so that the light sensing unit generates a leakage current according to the light of the red light pen, resulting in a leakage current. The situation of misjudgment of touch.

According to the above, in the foregoing embodiment, the charging unit may further include at least one light sensing component for sensing a second color light, and the light sensing unit generates a leakage current according to the second color light. The intensity of the second color of light produces a corresponding compensation current. For example, the switching element M1 shown in FIG. 3, the switching elements M2 and M3 shown in FIG. 4, or the fifth drawing The switching elements M4 and M5 shown may each be a light sensing component, or the charging unit may further comprise a light sensing component, so that a corresponding compensation current is generated in the case of a leakage current to avoid a situation in which the touch is misjudged.

Figure 7 is a circuit diagram showing a sensing circuit as shown in Figure 2 in accordance with a fourth embodiment of the present invention. Compared with the embodiment shown in FIG. 3, in the sensing circuit 120d shown in FIG. 7, the photo transistor MP corresponds to the green color resistance CF_G, and the switching element M1 (or the charging unit) corresponds to the red color resistance. The CF_R is configured, and the switching element M1 is a light sensing element and can be in a corresponding conduction state according to the corresponding light intensity.

In operation, in the case of green LED light pen illumination, the photoelectric crystal MP will normally operate to be turned on to generate a corresponding induced current; in addition, in the case of a red LED light pen, the light of the red LED light pen passes through the green color resistance CF_G, Therefore, the photoelectric crystal MP generates a leakage current according to the red light. At this time, the component M1 senses the red light through the red color resistance CF_R to generate a corresponding compensation current to compensate the leakage of the photoelectric crystal MP through the green color resistance CF_G according to the red light. The current causes the leakage current generated by the photo-electric crystal MP to not affect the presentation of the normal touch operation signal, and can also avoid the distortion of the light-sensitive signal corresponding to the green color resistance CF_G caused by the red light, thereby improving the specific color resistance and the different color light pens. The problem of light matching operation.

FIG. 8 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to a fifth embodiment of the present invention. Compared with the embodiment shown in FIG. 4, in the sensing circuit 120e shown in FIG. 8, the photo transistor MP corresponds to the green color resistance CF_G, and the switching elements M2 and M3 (or the charging unit) correspond to the red color. Color resistance CF_R configuration, and switching elements M2 and M3 For the light sensing component, it can be in a corresponding conduction state according to the corresponding light intensity.

In operation, in the case of green LED light pen illumination, the photoelectric crystal MP will normally operate to be turned on to generate a corresponding induced current; in addition, in the case of a red LED light pen, the light of the red LED light pen passes through the green color resistance CF_G, Therefore, the photo-electric crystal MP generates leakage current according to the red light. At this time, the components M2 and M3 sense red light through the red color resistance CF_R to generate a corresponding compensation current to compensate the photoelectric crystal MP to generate the green color resistance CF_G according to the red light. The leakage current can avoid the distortion of the optical sensing signal corresponding to the green color resistance CF_G caused by the red light, thereby improving the problem of the light matching operation between the specific color resistance and the different color light pens.

Figure 9 is a circuit diagram showing a sensing circuit as shown in Figure 2 in accordance with a sixth embodiment of the present invention. Compared with the embodiment shown in FIG. 5, in the sensing circuit 120f shown in FIG. 9, the photo transistor MP corresponds to the green color resistance CF_G, and the switching elements M4 and M5 (or the charging unit) correspond to the red color. The color resistance CF_R is configured, and the switching elements M4 and M5 are light sensing elements and can be in a corresponding conduction state according to the corresponding light intensity.

Similarly, in the case of red LED light pen illumination, since the light of the red LED light pen passes through the green color resistance CF_G, the photoelectric crystal MP generates a leakage current according to the red light, and at this time, the components M4 and M5 are transmitted through the red color resistance CF_R. The red light generates a corresponding compensation current to compensate the leakage current generated by the photoelectric crystal MP through the green color resistance CF_G according to the red light, thereby avoiding the distortion of the light sensing signal corresponding to the green color resistance CF_G caused by the red light, thereby improving the specific color resistance. The problem of working with light of different color light pens.

Figure 10 is a diagram showing the second embodiment according to the seventh embodiment of the present invention. The circuit diagram of the sensing circuit shown in the figure. Compared with the embodiment shown in FIG. 9, in the sensing circuit 120g shown in FIG. 10, the photo transistor MP corresponds to the blue color resistance CF_B, and the switching elements M4 and M5 (or the charging unit) correspond to the green. The color resistance CF_G is configured, and the switching elements M4 and M5 are light sensing elements and can be in a corresponding conduction state according to the corresponding light intensity.

Similarly, in the case of green LED light pen illumination, since the light of the green LED light pen passes through the blue color resistance CF_B, the photoelectric crystal MP generates a leakage current according to the green light, and at this time, the components M4 and M5 are sensed by the green color resistance CF_G. The green light generates a corresponding compensation current to compensate the leakage current generated by the photoelectric crystal MP through the blue color resistance CF_B according to the green light, thereby avoiding the distortion of the optical sensing signal corresponding to the blue color resistance CF_B caused by the green light, thereby improving the specific color resistance. The problem of working with light of different color light pens.

The configuration of other different color resists and the operation of different color light matching operations are similar to the above-mentioned compensation methods, and can be deduced by analogy, and thus will not be described herein.

It can be seen from the above that the application of the foregoing embodiments of the present invention can effectively improve the situation that the induced output signal is incorrect due to the RC loading effect, thereby preventing the occurrence of misjudgment of the touch operation and improving the specific color. The problem of leakage current is prevented by the operation of the light of different color light pens, so as to avoid affecting the generation of normal touch signals.

The present invention has been disclosed in the above embodiments, but it is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

120‧‧‧Induction circuit

210‧‧‧ Energy storage unit

220‧‧‧Light sensing unit

230‧‧‧Charging unit

Claims (10)

An inductive circuit includes: an energy storage unit; a light sensing unit electrically coupled to the energy storage unit for sensing a first color light and displaying the intensity of the first color light according to the sensing Corresponding conduction state to control the discharge of the energy storage unit, and to reset the energy storage unit according to a control signal being turned on; and a charging unit electrically coupled to the energy storage unit and at the storage The energy storage unit is charged during the reset of the energy unit. The sensing circuit of claim 1, wherein the charging unit is controlled by a voltage stored by the energy storage unit to selectively charge the energy storage unit. The sensing circuit of claim 1 or 2, wherein the energy storage unit further comprises a capacitive component, the charging component further comprising at least one switching component, wherein the at least one switching component is configured to conduct the voltage according to the voltage stored by the capacitive component The capacitive element is supplied with a voltage. The sensing circuit of claim 1 or 2, wherein the charging unit further comprises: at least one light sensing component for sensing a second color light, and generating, according to the second color light, the light sensing unit In the case of leakage current, a corresponding compensation current is generated according to the intensity of the second color light. A touch sensing panel comprising: a plurality of sensing circuits, each of the sensing circuits comprising: a capacitive element; a photoelectric crystal electrically coupled to the capacitive element at an operating node for sensing the intensity of a first color of light and presenting a corresponding a conducting state, wherein the capacitor element is discharged through the photo-crystal, wherein the photo-crystal system is controlled by a control signal to be turned on, so that the capacitor element is reset through the photo-electric crystal; and a charging unit electrically coupled to the The capacitive element is at the operating node and turns on the capacitive element and a supply voltage during the resetting of the capacitive element. The touch sensing panel of claim 5, wherein the charging unit further comprises: a switching element having a control end, a first end and a second end, wherein the control end and the second end are electrically coupled The capacitor element is connected to the operating node, and the first end is configured to electrically couple the supply voltage. The touch sensing panel of claim 5, wherein the charging unit further comprises: a first switching component having a control terminal, a first terminal and a second terminal, wherein the control terminal is electrically coupled to the capacitor The first end is configured to electrically couple the supply voltage; and the second switch element has a control end, a first end, and a second end, wherein the control end and the second end The first end is electrically coupled to the second end of the first switching element. The touch sensing panel of claim 5, wherein the charging unit further comprises: a first switching component having a control terminal, a first terminal and a second terminal, wherein the control terminal is electrically coupled to the capacitor The first end is configured to electrically couple the supply voltage, and the second switch element has a control end, a first end, and a second end, wherein the control end and the first end The second end is electrically coupled to the second end of the first switching element, and the second end is electrically coupled to the capacitive element to the operating node. The touch sensing panel of any one of claims 5 to 8, further comprising: a color filter comprising a plurality of color resists, wherein the color resists further comprise a first color having a first color And a second color resist having a second color corresponding to the photonic crystal configuration, the second color resist corresponding to the charging unit configuration. The touch sensing panel of claim 5, further comprising: a color filter comprising a plurality of color resists, wherein the color resists further comprise a first color resist and a second color resist, the first color The second color resist is disposed corresponding to the charging unit, wherein the charging unit further includes at least one light sensing component, and the at least one light sensing component transmits the second color resisting sensor The two color lights generate a corresponding compensation current to compensate for the leakage current generated by the photoelectric crystal through the first color resistance according to the second color light.