TWI559768B - Sampling control circuit for passive pixel and method thereof - Google Patents

Description

Sampling control circuit for animated element and method thereof

The present invention is a sampling control technique, and more particularly to a sampling control circuit for an anthocyanin and a method thereof.

In the photo sensor array architecture of the Passive Pixel Sensor (PPS), an integrator is sometimes used to accumulate the internal charge of the pixel to convert the signal into a voltage. Transfer out. However, due to the difference between the sensor array designs, the accumulated charge is not the same, and the charging time is not the same. The sampling of the signal passes through the sampling signal of the external circuit. Generally speaking, the sampling time depends on the electrical characteristics of the Thin Film Transistor (TFT) and the internal charging state of the pixel, but the external circuit cannot know the actual pixel. The exact time at which the sample is taken can only be set to a fixed value based on past experience, resulting in additional charge build up in the integrator.

Therefore, how to change the sampling time point according to each charging time to accurately obtain the internal charge information of the pixel is one of the current important research and development topics, and has become a goal that needs improvement in the related fields.

In order to determine the sampling signal time point according to the actual charging condition of the pixel, one aspect of the present disclosure is to provide a sampling control circuit for passive pixels, which includes an integrating circuit and correlated double sampling. The CDS) circuit, the current detecting circuit and the sampling arbiter, wherein the integrating circuit is electrically coupled to the pixel switch, and the correlated double sampling circuit is electrically coupled to the integrating circuit. The integrating circuit includes an integrating capacitor. The pixel switch is configured to electrically connect or electrically isolate the integrating circuit and the animated element according to the charging control signal. The current detecting circuit is used to measure related information reflecting the capacitance current of the integrating capacitor. The sampling arbiter is configured to: when detecting the reset signal received by the correlated double sampling circuit, according to the level of the charging control signal, when determining that the relationship between the capacitive current and the current threshold meets a predetermined condition, outputting the control signal To the correlated double sampling circuit, the correlation double sampling circuit is activated to sample the output voltage of the integrating circuit.

A further aspect of the present disclosure is a sampling control method for an anthocyanin, comprising: electrically connecting or electrically isolating an integrating circuit and an animated element according to a charging control signal through a pixel switch, wherein the integrating circuit includes Integral capacitor; the current detecting circuit measures the information of the capacitor current reflecting the integrating capacitor; and the sampling arbiter detects the reset signal received by the correlated double sampling circuit, and according to the level of the charging control signal, When it is determined that the relationship between the capacitance current and the current threshold value meets a predetermined condition, the control signal is outputted to the correlated double sampling circuit, thereby starting the correlated double sampling circuit to sample the output voltage of the integrating circuit.

In summary, the present disclosure detects the current value flowing through the integrating capacitor included in the integrating circuit to determine the time point at which pixel charging is completed, and samples the output voltage of the integrating circuit at this point in time. Compared with the method of sampling the fixed time value in the prior art, the present invention can improve the sampling control circuit according to the pixel sensor coupled with the integration circuit, sampling the output voltage according to the time point when the pixel charging is actually completed. In the range of different pixel design, and at the same time improve the sampling accuracy of the pixel charging voltage.

The above description will be described in detail in the following embodiments, and further explanation of the technical solutions of the present disclosure is provided.

The above and other objects, features, advantages and embodiments of the present disclosure will become more apparent and understood.

100, 200, 300, 400‧‧‧Sampling control circuit for animated

110‧‧‧Integral circuit

120‧‧‧Related double sampling circuit

122‧‧‧Secondary circuit

130‧‧‧ Current detection circuit

140‧‧‧Sampling arbiter

150‧‧‧ pixel switch

G[n]‧‧‧Charging control signal

Cst‧‧‧ pixel capacitor

Vdiode‧‧‧ diode voltage

Vbias‧‧‧ bias

Vout‧‧‧ output voltage

OE‧‧‧ signal

HS‧‧‧ control signal

HR‧‧‧Reset signal

Vreset, Vsignal‧‧‧ sampling voltage

Vdata‧‧‧ data voltage

I‧‧‧Charging current

Ic, Ic’‧‧‧ Capacitance current

Mux_rst‧‧‧ switch

Cfb‧‧‧ integral capacitor

212‧‧‧Operational Amplifier

232‧‧‧ galvanometer

R‧‧‧Resistors

Vr‧‧‧ voltage value across the resistor

Vref‧‧‧reference voltage

432‧‧‧ Differentiator

700,800‧‧‧Sampling control method for animated

S702~S716, S802~S816‧‧‧ steps

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. Schematic diagram of a sampling control circuit of a pixel; FIG. 2 is a schematic diagram of a sampling control circuit for an animated element according to an embodiment of the present disclosure; and FIG. 3 is a diagram for sampling an anthracin of an embodiment of the present disclosure. FIG. 4 is a schematic diagram of a sampling control circuit for an animated element according to an embodiment of the present disclosure; FIG. 5 is a diagram showing an animated element through an electron accumulation according to an embodiment of the present disclosure. Charging signal timing diagram; FIG. 6 is an illustration of an animated element through a hole in the embodiment of the present disclosure a timing sequence diagram of a hole accumulation charging; FIG. 7 is a flow chart showing a sampling control method for an anthocyanin according to another embodiment of the present disclosure, wherein an anthocyanin is charged by electronic accumulation; and 8th The figure illustrates a flow chart of a sampling control method for a hole accumulation type animated element according to another embodiment of the present disclosure, wherein an anthocyanin is cumulatively charged through a hole.

To make the description of the present disclosure more detailed and complete, reference is made to the drawings and the various embodiments described below. The examples are not intended to limit the scope of the invention; the description of the steps is not intended to limit the order of execution thereof, and any device having equal efficiency resulting from recombination is covered by the present invention. range.

In the scope of the embodiments and claims, "one" and "the" may mean a single or plural unless the context specifically dictates the articles.

In addition, as used herein, "coupled" and "connected" 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. "Connected" may also mean that two or more elements operate or interact with each other.

As shown in FIG. 1 , it is a schematic diagram of a sampling control circuit 100 for passive pixels according to an embodiment of the disclosure. The sampling control circuit 100 includes an integrating circuit 110, correlated double sampling Correlation double sampling (CDS) circuit 120, current detecting circuit 130 and sampling arbiter 140, wherein the integrating circuit 110 is electrically coupled to the pixel switch 150, and the correlated double sampling circuit is electrically coupled to Integral circuit 110. The pixel switch 150 is configured to electrically connect or electrically isolate the integrating circuit 110 from the animated element according to the charging control signal G[n]. In one embodiment, when the charging control signal G[n] is at the logic high level, the integrating circuit 110 is electrically connected to the animated element; and when the charging control signal G[n] is at the logic low level, the electrical isolation integrating circuit 110 is electrically isolated. With being animated. The diode is connected to the diode and the pixel capacitor Cst, which are electrically connected in parallel. The end point electrically connected to the pixel switch and the pixel switch has a diode voltage Vdiode, and is electrically connected to the other end of the an anthracin. Bias Vbias.

The sample arbiter 140 is enabled by the OE signal to operate normally. In one embodiment, the OE signal is the same as the charge control signal G[n]. The current detecting circuit 130 is configured to measure related information reflecting the capacitance current of the integrating capacitor to further know the actual charging condition of the anthocyanin. The sampling arbiter 140 is configured to detect the reset signal HR received by the correlated double sampling circuit 120 and determine the relationship between the capacitance current and the current threshold according to the predetermined condition according to the level of the charging control signal G[n]. The control signal HS is outputted to the correlated double sampling circuit 120 to activate the correlated double sampling circuit 120 to sample the output voltage Vout of the integrating circuit 110. In an embodiment, the predetermined condition may be a condition defined by the user to determine that the anthocyin is charged.

In one embodiment, the anesthetic is transmitted through electron accumulation, the reset signal HR is directly supplied from the outside or the external circuit is supplied to the correlation double sampling circuit 120 and the sampling arbiter 140, and the correlated double sampling circuit 120 When the reset signal HR is received, the output voltage Vout of the integrating circuit 110 is sampled at this time, and is stored in the capacitor as the sampling voltage Vreset. When the sampling arbiter 140 detects the reset signal HR, when determining that the charging control signal G[n] is at a logic high level, it indicates that the pixel switch is electrically connected to the integrated circuit 110 and the animated element, and the anthocyanin has been Charging starts with charging current I. Therefore, the predetermined condition is to further determine whether or not the capacitance current Ic is smaller than the current threshold value Ith. When the capacitor current Ic is less than the current threshold value Ith, it indicates that the animation is nearing completion of charging, and the sampling arbiter 140 outputs the control signal HS to the correlated double sampling circuit 120 to sample the output voltage Vout of the integrating circuit 110. The sampling voltage Vsignal is stored in the capacitor. The above current threshold value Ith can be determined according to actual conditions. In an embodiment, the minimum value I _{th_min of the} current threshold value Ith is _determined by the formula (1).

Where t _{Gate_ON_Period} is the time when the _anthocyin is charged, that is, the time when the pixel switch 150 is electrically connected to the integrating circuit 110 and the animated element, and is generally calculated according to the system resolution and the frame rate. In addition, if the pixel switch on time is t _{Gate_ON_Period} , the cross-pressure of the _anthocyanin can be charged to reach 99.75% of (Vref-Vbias). R _ON is the TFT on resistance when the thin film transistor is turned on, Cst is the equivalent capacitance value of the anthocyanin, Vref is the voltage at the connection end of the pixel switch and the integration circuit, and Vbias is the bias voltage. In one embodiment, t _{Gate_ON_Period} is (6R _ON Cst), R _ON is 1M ohms, Vref is 1 volt (V), and Vbias is -6 volts (V), and the calculated minimum current threshold I _{Th_min} is 1.75 x 10 ^-8 amps (A). In an embodiment, if the cross-voltage charging by the an anthraquinone is reached to reach 99% of (Vref-Vbias) as the standard for charging completion, the current threshold value Ith can be calculated as 7 according to formulas (2) and (3). ×10 ^-8 amps (A). In this way, the user can also determine, according to actual needs, the other percentage of the trans-voltage charge of the anthraquinone (Vref-Vbias) as the standard for charging completion, and calculate the corresponding according to the formulas (2) and (3). The current threshold is Ith.

Alternatively, in an embodiment, the animated element is electronically accumulatively charged, and the reset signal HR is directly supplied from the outside or the external circuit is supplied to the correlated double sampling circuit 120 and the sampling arbiter 140, and the correlated double sampling circuit 120 receives When the signal HR is reset, the output voltage Vout of the integrating circuit 110 at this time is sampled and stored in the capacitor as the sampling voltage Vreset. When the sampling arbiter 140 detects the reset signal HR, when determining that the charging control signal G[n] is at a logic low level, it indicates that the pixel switch is electrically isolated integrated circuit 110 and the animated element, and the anthocyanin has not yet started. Charging. Therefore, the predetermined condition is to first determine whether the capacitor current Ic is greater than the current threshold value Ith, that is, First judge that the anthocyanin starts charging. When the capacitance current Ic is greater than the current threshold value Ith, it means that the anthocyanin is being charged by the charging current I at this time, and then it is determined whether the capacitance current Ic is smaller than the current threshold Ith. When the capacitor current Ic is less than the current threshold value Ith, it indicates that the animation is nearing completion of charging, and the sampling arbiter 140 outputs the control signal HS to the correlated double sampling circuit 120 to sample the output voltage Vout of the integrating circuit 110. The sampling voltage Vsignal is stored in the capacitor. The current threshold value Ith can be determined according to the actual demand elasticity through the above formulas (1) to (3), and will not be described here.

In another embodiment, the animation is accumulating through holes, and the reset signal HR is directly supplied from the outside or external circuit is supplied to the correlated double sampling circuit 120 and the sampling arbiter 140, and the correlated double sampling is performed. When the circuit 120 receives the reset signal HR, the output voltage Vout of the integrating circuit 110 is sampled at this time, and is stored in the capacitor as the sampling voltage Vreset. When the sampling arbiter 140 detects the reset signal HR, when determining that the charging control signal G[n] is at a logic high level, it indicates that the pixel switch is electrically connected to the integrated circuit 110 and the animated element, and the anthocyanin has been The charging current I starts to be charged, and the current direction is opposite to the current direction when the electronic cumulative charging is performed, that is, the capacitive cumulative charging capacitor current Ic' is opposite to the electronic cumulative charging capacitive current Ic (defining the second figure) ~ The capacitance current direction in Figure 4 is positive to the right). Therefore, the predetermined condition is to further determine whether or not the capacitance current Ic' is larger than the current threshold value Ith'. When the capacitor current Ic' is greater than the current threshold Ith', it indicates that the animation is nearing completion of charging, and the sampling arbiter 140 outputs the control signal HS to the correlated double sampling circuit 120 to sample the output voltage Vout of the integrating circuit 110. As The sampling voltage Vsignal is stored in the capacitor. The current threshold value Ith' can be determined according to the actual demand elasticity through the above formulas (1) to (3), and will not be described here.

Alternatively, in an embodiment, the animated element is accumulatively charged through the hole, and the reset signal HR is directly supplied from the outside or the external circuit is supplied to the correlated double sampling circuit 120 and the sampling arbiter 140, and the correlated double sampling circuit 120 receives When the reset signal HR is reached, the output voltage Vout of the integrating circuit 110 is sampled at this time, and stored as a sampling voltage Vreset in the capacitor. When the sampling arbiter 140 detects the reset signal HR, when determining that the charging control signal G[n] is at a logic low level, it indicates that the pixel switch is electrically isolated integrated circuit 110 and the animated element, and the anthocyanin has not yet started. Charging. Therefore, the predetermined condition is to first judge whether or not the capacitance current Ic' is smaller than the current threshold value Ith', that is, to judge that the animation is started to be charged. When the capacitance current Ic' is smaller than the current threshold value Ith', it indicates that the anthocyanin is being charged by the charging current I at this time, and then it is judged whether or not the capacitance current Ic' is larger than the current threshold value Ith'. When the capacitor current Ic' is greater than the current threshold Ith', it indicates that the animation is nearing completion of charging, and the sampling arbiter 140 outputs the control signal HS to the correlated double sampling circuit 120 to sample the output voltage Vout of the integrating circuit 110. , stored as a sampling voltage Vsignal in the capacitor. The current threshold value Ith' can be determined according to the actual demand elasticity through the above formulas (1) to (3), and will not be described here.

The present disclosure exemplifies different implementations for current sensing circuit 130. Please refer to FIG. 2, which is a schematic diagram of a sampling control circuit 200 for an animated element according to an embodiment of the present disclosure. Sampling control The hardware structure of the circuit 200 is substantially the same as that of the sampling control circuit 100, except that the integrating circuit 110 further includes an operational amplifier 212 having an inverting input terminal, a non-inverting input terminal and an output terminal, and the inverting input terminal is electrically coupled to the integral. The first end of the capacitor Cfb is electrically coupled to the reference voltage Vref. The current detecting circuit 130 can be used as the current meter 232. The first end of the current meter 232 is electrically coupled to the second end of the integrating capacitor Cfb, and the second end of the current meter 232 is electrically coupled to the output end. The current meter 232 It is used to detect the capacitive current Ic or Ic' and output the capacitive current Ic or Ic' to the sampling arbiter 140.

In one embodiment, the ammeter 232 detects the capacitive current Ic or Ic' flowing through the integrating capacitor Cfb, and outputs the capacitive current Ic or Ic' to the sampling arbiter 140 to facilitate the sampling arbiter 140 to perform the above-described determination of the capacitive current Ic. (or Ic') is related to the current threshold value Ith (or Ith'), that is, the process of determining whether or not the anthocyanin is charged.

Alternatively, please refer to FIG. 3, which is a schematic diagram of a sampling control circuit 300 for an animated element according to an embodiment of the present disclosure. The hardware structure of the sampling control circuit 300 is substantially the same as that of the sampling control circuit 100, except that the integrating circuit further includes an operational amplifier 212 having an inverting input terminal, a non-inverting input terminal, and an output terminal, and the non-inverting input terminal is electrically coupled to the reference. Voltage Vref. The current detecting circuit 130 can be implemented as a resistor R. The first end of the resistor R is electrically coupled to the inverting input terminal, and the second end of the resistor R is electrically coupled to the first end of the integrating capacitor Cfb. The second end of the capacitor Cfb is electrically coupled to the output end.

In one embodiment, the capacitor current Ic or Ic' flows through the resistor R, and a voltage across the resistor R is formed. The sampling arbiter 140 receives the voltage value Vr across the resistor R, and uses the voltage value Vr. And relation Vr=R× Ic (or Vr = R × Ic') to calculate the capacitance current Ic or Ic' to facilitate the sampling arbiter 140 to determine the relationship between the capacitance current Ic (or Ic') and the current threshold Ith (or Ith'). , that is, the process of judging whether or not the anthocyanin is charged.

Alternatively, please refer to FIG. 4, which is a schematic diagram of a sampling control circuit 400 for an animated element according to an embodiment of the present disclosure. The sampling control circuit 400 has a hardware architecture substantially the same as that of the sampling control circuit 100, except that the integrating circuit 110 further includes an operational amplifier 212 having an inverting input terminal, a non-inverting input terminal, and an output terminal, and the inverting input terminal is electrically coupled to the The first end of the integrating capacitor Cfb is electrically coupled to the reference voltage Vref. The current detecting circuit is implemented as a differentiator 432. The input end of the differentiator 432 is electrically coupled to the second end of the integrating capacitor Cfb and the output end of the integrating circuit 110. The output of the differentiator 432 is electrically coupled to the output end. The sample arbiter 140.

In one embodiment, the differentiator 432 receives the output voltage Vout of the integrating circuit 110 and outputs its rate of change to the sampling arbiter 140, that is, the output voltage change rate (dVout/dt) to the sampling arbiter 140. The sampling arbiter 140 is configured to receive a voltage change rate (dVout/dt) of the integrating capacitor Cfb output from the differentiator 432, using a voltage change rate (dVout/dt) and a relationship Ic=Cfb×(dVout/dt) (or Ic' =Cfb×(dVout/dt)) to calculate the capacitance current Ic or Ic' to facilitate the sampling arbiter 140 to determine the relationship between the capacitance current Ic (or Ic') and the current threshold Ith (or Ith'). That is, it is judged whether or not the anesthetic is charged.

In order to further explain the electronic accumulation charging of the animated element in the charging process, the sampling control circuit internal signal changes, please refer to 2 to 5, FIG. 5 is a timing chart showing the signal transmission by an ancinizing element through electron accumulation charging according to an embodiment of the present disclosure. In an embodiment, when the correlated double sampling circuit 120 receives the reset signal HR, the output voltage Vout of the integrating circuit 110 is sampled at this time; at this time, the switch Mux_rst is turned on, and the output voltage Vout is Vref, so Vref is used as the sampling voltage. Vreset is stored in a capacitor. The sampling arbiter 140 determines that the charging control signal G[n] is at a logic low level while detecting the reset signal HR, indicating that the pixel switch is electrically isolated integrated circuit 110 and the animated element, and the anthocyanin has not yet started. Charging. Therefore, the predetermined condition is to first determine whether the capacitive current Ic is greater than the current threshold value Ith, that is, to first determine that the anesthetic starts charging. When the capacitance current Ic is greater than the current threshold value Ith, it indicates that the anthocyin is being charged, Vout is greater than Vref, and then it is determined whether the capacitance current Ic is smaller than the current threshold Ith. When the capacitor current Ic is smaller than the current threshold value Ith (as indicated by the arrow of the Ic curve and the Ith dotted line in the arrow in FIG. 5), it indicates that the antherin has reached the above-mentioned user-defined charging completion condition, and the sampling arbiter 140 outputs the control signal. The HS to the correlated double sampling circuit 120 samples the output voltage Vout of the integrating circuit 110; at this time, the output voltage Vout is (ΔV × Cst / Cfb + Vref), so (ΔV × Cst / Cfb + Vref) as the sampling voltage Vsignal It is stored in a capacitor, where Vout is derived from the following formulas (4) to (6).

Where Δt is the time when the charging control signal G[n] is at the logic high level, that is, the above pixel switch opening time t _{Gate_ON_Period} , Cst is the equivalent capacitance value of the _anthocyanin , Vref is the reference voltage, and the diode voltage Vdiode Vbias is the bias voltage for the voltage between the pixel switch and the anemone. The correlated double sampling circuit 120 performs sampling of the sampled voltage Vreset before being charged by the an anthraquinone and the sampled voltage Vsignal charged by the anthocyanin, and can pass through the operation of the secondary circuit 122 to output the data voltage Vdata. In the present embodiment, the calculated value of Vdata is (ΔV × Cst / Cfb).

On the other hand, in order to further explain the variation of the signal inside the sampling control circuit during the charging process of the accumulative charging of the hole, please refer to FIG. 2 to FIG. 4, FIG. 6 and FIG. A signal timing diagram for accumulative charging of an anisin through a hole according to an embodiment of the present disclosure. In an embodiment, when the correlated double sampling circuit 120 receives the reset signal HR, the output voltage Vout of the integrating circuit 110 is sampled at this time; at this time, the switch Mux_rst is turned on, and the output voltage Vout is Vref, so Vref is used as the sampling voltage. Vreset is stored in a capacitor. The sampling arbiter 140 determines that the charging control signal G[n] is at a logic low level while detecting the reset signal HR, indicating that the pixel switch is electrically isolated integrated circuit 110 and the animated element, and the anthocyanin has not yet started. Charging. Therefore, the predetermined condition is to first judge whether or not the capacitance current Ic' is smaller than the current threshold value Ith', that is, to judge that the animation is started to be charged. When the capacitance current Ic' is smaller than the current threshold Ith', it means that this time While the anthocyanin is being charged, Vout is greater than Vref, and then it is determined whether the capacitance current Ic is less than the current threshold Ith. When the capacitor current Ic' is greater than the current threshold Ith' (as indicated by the arrow in Figure 6, the intersection of the Ic' curve and the Ith' line), indicating that the antherin has reached the above-mentioned user-defined charging completion condition, and sampling is performed at this time. The arbiter 140 outputs the control signal HS to the correlated double sampling circuit 120 to sample the output voltage Vout of the integrating circuit 110; at this time, the output voltage Vout is (ΔV × Cst / Cfb + Vref), so (ΔV × Cst / Cfb + Vref) is stored in the capacitor as the sampling voltage Vsignal, wherein Vout is derived from the above formulas (4) to (6). The correlated double sampling circuit 120 completes the sampling of the sampled voltage Vreset before being charged by the an anthraquinone and the sampled voltage Vsignal after being charged by the anthocyanin, and then passes through the operation of the secondary circuit 122 to output the data voltage Vdata. In the present embodiment, the calculated value of Vdata is (ΔV × Cst / Cfb).

Figure 7 is a flow chart illustrating a method for sampling control of an anthocyanin in another embodiment of the present disclosure in which an anisin is charged by electronic accumulation. The sampling control method 700 for an anthracis includes a plurality of steps S702 to S716, which can be applied to the sampling control circuits 100 to 400 for an animating elements as shown in FIGS. 1 to 4, but familiar with the present case. It should be understood by those skilled in the art that the steps mentioned in this embodiment can be adjusted according to actual needs, except that the order is specifically described, and may be performed simultaneously or partially simultaneously.

First, in step S702, the pixel circuit is electrically connected or electrically isolated according to the charging control signal to be an anisin, wherein the integrating circuit includes an integrating capacitor. In an embodiment, when the charging control signal is located The logic high level is on time, the integration circuit is electrically connected with the animated element; and when the charging control signal is at the logic low level, the integration circuit is electrically isolated and the animated element. In step S704, the current detecting circuit measures the related information of the capacitive current reflecting the integrating capacitor to further know the actual charging condition of the anthocyanin. In step S706, it is determined by the sampling arbiter whether a reset signal is detected. If the reset signal is not detected, step S706 is performed until a reset signal is received. If the reset signal is received, step S708 is performed to determine whether the charging control signal is at a logic high level, and then set different predetermined conditions regarding the relationship between the capacitor current and the current threshold, and output the control signal to the correlation when the predetermined condition is met. Double sampling circuit. If it is determined that the charging control signal is at a logic high level, it indicates that the pixel switch is electrically connected to the integrated circuit and the animated element, and the anthocyanin has begun to charge with the charging current. Therefore, in step S710, the predetermined condition is to further determine whether the capacitance current is less than the current threshold. If the capacitor current is still greater than the current threshold, indicating that the anthocyanin has not been charged, step S710 is performed until it is determined that the capacitor current is less than the current threshold. When the capacitance current is less than the current threshold, indicating that the animation is nearing completion of charging, step S716 is performed, and the control signal is outputted to the correlated double sampling circuit through the sampling arbiter to sample the output voltage of the integrating circuit and stored in In the capacitor. The current threshold can be determined by the above formulas (1) to (3) according to the actual demand elasticity, and will not be described here.

On the other hand, if it is determined in step S708 that the charging control signal is at a logic low level, it indicates that the pixel switch is electrically isolated integrated circuit and the animated element at this time, and the anthocyanin has not started charging. Therefore, the predetermined condition is that it is first determined in step S712 whether the capacitance current is greater than a current threshold value, that is, the first judgment is The animation is starting to charge. If the capacitor current is less than the current threshold, indicating that the anthocyanin has not yet started charging, step S712 is performed until the capacitor current is greater than the current threshold. When the capacitance current is greater than the current threshold, it means that the anthocyanin is being charged by the charging current, and then it is determined in step S714 whether the capacitance current is less than the current threshold. If the capacitor current is still greater than the current threshold, indicating that the anthocyanin has not been charged, step S714 is performed until it is determined that the capacitor current is less than the current threshold. When the capacitance current is less than the current threshold, indicating that the animation is nearing completion of charging, step S716 is performed, and the control signal is outputted to the correlated double sampling circuit through the sampling arbiter to sample the output voltage of the integrating circuit and stored in the capacitor. in. The current threshold can be determined by the above formulas (1) to (3) according to the actual demand elasticity, and will not be described here.

Figure 8 is a flow chart illustrating a method for sampling control of a hole accumulating animated element in another embodiment of the present disclosure in which an anthocyanin is cumulatively charged through a hole. The sampling control method 800 for an anthracis includes a plurality of steps S802 to S816, which can be applied to the sampling control circuits 100 to 400 for an animated elements as shown in FIGS. 1 to 4, but familiar with the present case. It should be understood by those skilled in the art that the steps mentioned in this embodiment can be adjusted according to actual needs, except that the order is specifically described, and may be performed simultaneously or partially simultaneously.

First, in step S802, the pixel circuit is electrically connected or electrically isolated according to the charging control signal to be an anisin, wherein the integrating circuit includes an integrating capacitor. In an embodiment, when the charging control signal is at a logic high level, the integration circuit is electrically connected to the animated element; and when the charging control is performed The signal is located at the logic low level, and the electrical isolation integral circuit and the animated element. In step S804, the current detecting circuit measures the related information of the capacitive current reflecting the integrating capacitor to further know the actual charging condition of the anthocyanin. In step S806, it is determined by the sampling arbiter whether a reset signal is detected. If the reset signal is not detected, step S806 is performed until a reset signal is received. If the reset signal is received, step S808 is performed to determine whether the charging control signal is at a logic high level, and then set different predetermined conditions regarding the relationship between the capacitance current and the current threshold, and output the control signal to the correlation when the predetermined condition is met. Double sampling circuit. If it is determined that the charging control signal is at a logic high level, it indicates that the pixel switch is electrically connected to the integrated circuit and the animated element, and the anthocyanin has begun to charge with the charging current. Therefore, in step S810, the predetermined condition is to further determine whether the capacitance current is less than the current threshold. If the capacitor current is still greater than the current threshold, indicating that the anthocyanin has not been charged, step S810 is performed until it is determined that the capacitor current is less than the current threshold. When the capacitor current is less than the current threshold, indicating that the animation is nearing completion of charging, step S816 is performed, and the control signal is outputted to the correlated double sampling circuit through the sampling arbiter to sample the output voltage of the integrating circuit and stored in In the capacitor. The current threshold can be determined by the above formulas (1) to (3) according to the actual demand elasticity, and will not be described here.

On the other hand, if it is determined in step S808 that the charging control signal is a logic low level, it indicates that the pixel switch is electrically isolated and the animated element is turned on, and the anthocyanin has not started charging. Therefore, the predetermined condition is that it is first determined in step S812 whether the capacitance current is greater than the current threshold value, that is, it is first determined that the animation is started to be charged. If the capacitor current is less than the current threshold, it means that it is animated. If the charging has not yet started, step S812 is performed until the capacitance current is greater than the current threshold. When the capacitance current is greater than the current threshold, it means that the anthocyanin is being charged by the charging current, and then it is determined in step S814 whether the capacitance current is less than the current threshold. If the capacitor current is still greater than the current threshold, indicating that the anthocyanin has not been charged, step S814 is performed until it is determined that the capacitor current is less than the current threshold. When the capacitance current is less than the current threshold, indicating that the animation has been nearly completed by charging, step S816 is performed, and the control signal is outputted to the correlated double sampling circuit through the sampling arbiter to sample the output voltage of the integrating circuit and stored in the capacitor. in. The current threshold can be determined by the above formulas (1) to (3) according to the actual demand elasticity, and will not be described here.

The following describes various implementations for the current detecting circuit in the above-described sampling control method 700 or 800 for the hole accumulating anthracis. In one embodiment, the current detecting circuit is an ammeter, the capacitive current is detected by the ammeter, and the capacitive current is output to the sampling arbiter. The above determines the relationship between the capacitance current Ic (or Ic') and the current threshold value Ith (or Ith') through the sampling arbiter, that is, the flow of determining whether or not the anthocyanin is charged.

In another embodiment, the current detecting circuit is a resistor; the voltage value across the resistor is received by the sampling arbiter, and the voltage value is used to calculate the capacitor current. The capacitor current Ic (or Ic') is calculated by the sampling arbiter using the voltage value and the relation Vr=R×Ic (or Vr=R×Ic′) to facilitate the determination of the capacitor current Ic through the sampling arbiter ( Or Ic') is related to the current threshold value Ith (or Ith'), that is, the process of determining whether or not the anthocyanin is charged.

In another embodiment, the current detecting circuit is a differentiator, and the differentiator is electrically coupled between the integrating circuit and the sampling arbiter; and the voltage change rate of the integrating capacitor of the output of the differentiator is received by the sampling arbiter, and the voltage change is utilized. Rate to calculate the capacitor current. The voltage change rate (dVout/dt) of the integrating capacitor outputted by the differentiator is received by the sampling arbiter, and the voltage change rate (dVout/dt) is used and the relationship Ic=Cfb×(dVout/dt) (or Ic'=Cfb×( dVout/dt)) to calculate the capacitance current Ic (or Ic') to determine the relationship between the capacitance current Ic (or Ic') and the current threshold Ith (or Ith') through the sampling arbiter, that is, the judgment The flow that is completed by the animation.

In summary, the present disclosure can detect the current value flowing through the integrating capacitor included in the integrating circuit to determine the time point at which the pixel charging is completed, and sample the output voltage of the integrating circuit at this time point. Compared with the method of sampling the fixed time value in the prior art, the present invention can improve the sampling control circuit according to the pixel sensor coupled with the integration circuit, sampling the output voltage according to the time point when the pixel charging is actually completed. Range, and at the same time improve the sampling accuracy of the pixel charging voltage.

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

100‧‧‧Sampling control circuit for animated

110‧‧‧Integral circuit

120‧‧‧Related double sampling circuit

122‧‧‧Secondary circuit

130‧‧‧ Current detection circuit

140‧‧‧Sampling arbiter

150‧‧‧ pixel switch

G[n]‧‧‧Charging control signal

Cst‧‧‧ pixel capacitor

Vdiode‧‧‧ diode voltage

Vbias‧‧‧ bias

Vout‧‧‧ output voltage

OE‧‧‧ signal

HS‧‧‧ control signal

HR‧‧‧Reset signal

Vdata‧‧‧ data voltage

I‧‧‧Charging current

Vreset, Vsignal‧‧‧ sampling voltage

Claims (16)

A sampling control circuit for passive pixels, comprising: an integrating circuit, comprising an integrating capacitor, the integrating circuit is electrically coupled to a pixel switch, wherein the pixel switch is used to control a signal according to a charge Electrically connecting or electrically isolating the integrating circuit and the animated element; a correlated double sampling circuit electrically coupled to the integrating circuit; and a current detecting circuit for measuring the reflected An information about a capacitive current of the integrating capacitor; and a sampling arbiter for detecting a reset signal received by the correlated double sampling circuit according to the level of the charging control signal, When it is determined that the relationship between the capacitance current and a current threshold value meets a predetermined condition, a control signal is outputted to the correlated double sampling circuit, thereby starting the correlated double sampling circuit to sample an output voltage of the integrating circuit. The sampling control circuit of claim 1, wherein the anesthetic is charged by electronic accumulation, and the sampling arbiter detects the reset signal while determining that the charging control signal is at a logic high level, the predetermined condition To further determine whether the capacitive current is less than the current threshold; when the capacitive current is less than the current threshold, the sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control circuit of claim 1, wherein the anesthetic is charged by electronic accumulation, and the sampling arbiter detects the reset signal while determining that the charging control signal is at a logic low level, the predetermined condition To determine whether the capacitor current is greater than the current threshold, when the capacitor current is greater than the current threshold, determine whether the capacitor current is less than the current threshold, and when the capacitor current becomes less than the current threshold, The sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control circuit of claim 1, wherein the anesthetic is cumulatively charged through a hole, and the sampling arbiter detects the reset signal while determining that the charging control signal is at a logic high level, the predetermined The condition is to determine whether the capacitor current is greater than the current threshold. When the capacitor current is greater than the current threshold, the sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control circuit of claim 1, wherein the anesthetic is cumulatively charged through a hole, and the sampling arbiter detects the reset signal while determining that the charging control signal is at a logic low level, the predetermined The condition is first to determine whether the capacitor current is less than the current threshold. When the capacitor current is less than the current threshold, it is determined whether the capacitor current is greater than the current threshold, and when the capacitor current becomes greater than the current threshold At the time of the value, the sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control circuit of claim 1, wherein the integrating circuit further includes an operational amplifier having an inverting input terminal, a positive phase input terminal, and an output terminal, the inverting input terminal being electrically coupled to the a first end of the integrating capacitor, the positive phase input is electrically coupled to a reference voltage; the current detecting circuit is an ammeter, and the first end of the current meter is electrically coupled to one of the integrating capacitors The second end of the galvanometer is electrically coupled to the output end. The galvanometer is configured to detect the capacitive current and output the capacitive current to the sampling arbiter. The sampling control circuit of claim 1, wherein the integrating circuit further comprises an operational amplifier having an inverting input terminal, a positive phase input terminal and an output terminal, the positive phase input terminal being electrically coupled to the The current detecting circuit is a resistor, and the first end of the resistor is electrically coupled to the inverting input terminal, and the second end of the resistor is electrically coupled to one of the integrating capacitors The first end, the second end of the integrating capacitor is electrically coupled to the output end; the sampling arbiter is configured to receive a voltage value of one end of the resistor, and use the voltage value to calculate the capacitor current. a sampling control circuit as claimed in claim 1, wherein the The integrating circuit further includes an operational amplifier having an inverting input terminal, a positive phase input terminal and an output terminal, the inverting input terminal being electrically coupled to the first end of the integrating capacitor, the positive phase input terminal Electrically coupled to a reference voltage; the current detecting circuit is a differentiator, and one input end of the differentiating device is electrically coupled to the second end of the integrating capacitor and the output end of the integrating circuit, the differential One of the output terminals is electrically coupled to the sampling arbiter; the sampling arbiter is configured to receive a voltage change rate of the one of the integrated capacitors output by the differentiator, and use the voltage change rate to calculate the capacitive current. A sampling control method for passive pixel, comprising: electrically connecting or electrically isolating an integrating circuit and the animated element according to a charging control signal through a pixel switch, wherein the integrating circuit comprises a Integrating capacitance; measuring a capacitance current reflecting one of the integrating capacitors through a current detecting circuit; receiving a correlated double sampling circuit through a sampling arbiter Simultaneously, according to the level of the charging control signal, when it is determined that the relationship between the capacitance current and a current threshold value meets a predetermined condition, a control signal is outputted to the correlated double sampling circuit, thereby starting the correlation. A double sampling circuit samples the output voltage of one of the integrating circuits. The sampling control method as described in claim 9 is further included The predetermined condition is to determine whether the capacitor current is less than the current when the charging arbiter determines that the charging control signal is at a logic high level while detecting the reset signal while the sampling arbiter detects the reset signal. Threshold value; when the capacitor current is less than the current threshold, the sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control method of claim 9, further comprising: the animated element is electronically accumulatively charged, and the sampling arbiter detects the reset signal while determining that the charging control signal is at a logic low level, The predetermined condition is to first determine whether the capacitor current is greater than the current threshold, and when the capacitor current is greater than the current threshold, determine whether the capacitor current is less than the current threshold, when the capacitor current becomes less than the current threshold The sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control method of claim 9, further comprising: the anesthetic is cumulatively charged through the hole, and the sampling arbiter detects the reset signal while determining that the charging control signal is at a logic high level. The predetermined condition is to further determine whether the capacitor current is greater than the current threshold; when the capacitor current is greater than the current threshold, the sampling arbitration The controller outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control method of claim 9, further comprising: accumulating charging by the anthocyanin through the hole, the sampling arbiter detecting the reset signal while determining that the charging control signal is at a logic low level, The predetermined condition is to first determine whether the capacitor current is less than the current threshold, and when the capacitor current is less than the current threshold, determine whether the capacitor current is greater than the current threshold, and when the capacitor current becomes greater than the current threshold The sampling arbiter outputs the control signal to the correlated double sampling circuit to sample the output voltage of the integrating circuit. The sampling control method of claim 9, wherein the current detecting circuit is an ammeter, the capacitor current is detected by the current meter, and the capacitor current is output to the sampling arbiter. The sampling control method of claim 9, wherein the current detecting circuit is a resistor; the voltage value of one of the two ends of the resistor is received by the sampling arbiter, and the voltage value is used to calculate the capacitor current. The sampling control method of claim 9, wherein the current detecting circuit is a differentiator, the differentiator is electrically coupled between the integrating circuit and the sampling arbiter; and the differential is received by the sampling arbiter The voltage change rate of one of the integral capacitors output by the device is used to calculate the capacitor current.