TWI448709B - Quality detecting method of a touch panel by different exciting signals with different voltages and a detecting device using the same - Google Patents

Description

Touch panel pros and cons detection method with different voltage stimulation signals Testing device

The invention relates to a method for detecting the pros and cons of a touch panel, in particular to a method for detecting the pros and cons of a touch panel with different voltage stimulation signals.

When the touch panel factory ships the touch panel to the touch panel module assembly factory, the assembly factory will first detect the advantages and disadvantages of the touch panel before assembly, and the most intuitive judgment is whether the touch panel can be correct. The location of the touch object is sensed, but such detection is too time consuming and laborious. Therefore, the touch panel assembly factory can read the analog digital conversion level on the touch panel as long as the touch panel performs the analog digital conversion characteristic adjustment program (ADC Calibration). Setting Value) is used as a conversion sensing value (ADC) in the subsequent execution of the scanning program. Referring to FIG. 8 , the touch panel 10a with n driving lines 11 and m sensing lines 12 is a sensing point because the driving line 11 and the sensing line 12 are interlaced, so that nxm sensing points are included. (not shown in the figure), and when the touch panel performs the analog digital conversion characteristic adjustment program, each sensing point obtains a corresponding analog digital conversion level, as shown in FIG.

The two ends of the driving lines 11 of the touch panel 10a of FIG. 8 are commonly connected to the same supporting pins TX1, TX2 to TXn of an external driving unit (not shown), and the two ends of the respective receiving lines 12 are connected in common. To the same receiving pin RX1, RX2~RXm of the external receiving unit (not shown); therefore, as shown in Fig. 9, the closer the numerical values of the analog-to-digital conversion levels of all sensing points are The higher the value of the two ends of the moving line 11 or the receiving line 12, the lower the value is, the farther the value is from the two ends. Therefore, the value of the analog digital shifting number of the good touch panel 10a will be a bowl-shaped distribution with a high periphery and a low center. Therefore, at present, the touch panel assembly factory finds the following conditions for detecting the good touch panel from the bowl-shaped distribution characteristics of the good touch panel 10a:

1. The difference between the analog value of the analog sensing points of the adjacent sensing points is small: the difference between the analog digital shift value of the adjacent sensing points and a preset good difference range can be used to determine whether the condition is met.

2. The maximum and minimum values of the analog-to-digital conversion file are distributed in a specific value.

3. The average value of the analog-to-digital conversion file has a specific value distribution: several touch panels can be selected from the same batch of touch panels, and the analog digital display of the selected touch panels is consistent. Distribution characteristics, as a comparison condition of other batches of touch panels.

Referring to FIG. 10, the other touch panel 10b is connected to the external driving unit and the receiving unit at both ends of the driving line 11 and the sensing line 12 (not shown). The two ends of the strip driving line 11 or the sensing line 12 are inadvertently broken or broken during the process, and after performing the analog-digital conversion characteristic adjustment procedure, the two ends are broken or broken on the driving line 11 or the sensing line 12 The sensing point has an abnormally low number of values or values of the analog-free digital conversion file, as shown by the number of sensing point positions indicated by the gray bottom in FIG. 11, and thus cannot meet the detection conditions of the above items 1-3. When the line is actually drawn, the touch point of the drive line 11 or the sense line 12, which is broken at either end or broken, will not be able to identify the position of the touch object, causing the drawn line to be broken (as shown in the dotted circle of Figure 12). Therefore, the touch panel 10B of FIG. 10 can be detected by the above items 1-3. Condition detection detects that the inferior product is correct.

Although the above-mentioned several detection conditions can filter out the touch panel of good or inferior products, the touch panel 10c which can correctly recognize the position of the touch object as shown in FIG. 13 also fails to meet the detection conditions of the above items 1-3. The judgement was inferior and was eliminated, so that the returned upstream touch panel factory could not accept it for the following reasons.

Since each of the driving lines 11 and the sensing lines 12 of the touch panel 10c shown in FIG. 13 is connected to an external driving unit and a receiving unit (not shown), it is a plurality of driving lines or sensing lines. If the single end is inadvertently broken during the process, as shown in FIG. 14, the single-ended broken driving line 11 or the sensing point on the sensing line 12 can receive the stimulation signal or the sensing signal through the unbroken or unbroken end. Therefore, the sensing points can still obtain the analog digital conversion file number value or the non-abnormal analog digital conversion file frequency value, and can output the correct sensing value in the subsequent scanning program, and have the ability to identify the touch object position, as shown in FIG. The line can be drawn normally. However, the analog digital shift value of the sensing point where the driving line 11 and the receiving line 12 which are disconnected or broken at one end are too different from the analog digital shift value of the adjacent normal sensing point, and the preset good difference range is exceeded. Moreover, the maximum value and the minimum value are not normally distributed. Therefore, although the touch panel 10c of FIG. 13 can correctly recognize the position of the touch object, it is eliminated as an inferior product because it cannot meet the above-mentioned 1-3 detection conditions, and naturally causes the upstream. The touch panel factory disagreed with the results of the assembly plant test.

Therefore, it is necessary to further improve the detection method of the advantages and disadvantages of the touch panel without considering the use of the hand-painted touch panel for time-consuming detection.

In view of the above-mentioned advantages and disadvantages of the touch panel, there is a certain probability that the touch panel can be eliminated. The main purpose of the present invention is to provide a touch panel pros and cons detection method and a detection device thereof with different voltage stimulation signals.

The main technical means for achieving the above purpose is that the touch panel pros and cons detection method comprises the following steps: performing an analog digital conversion characteristic adjustment program to obtain an analog digital conversion level of each sensing point of the touch panel; The voltage stimulation signal scans the touch panel, and obtains the first sensing value of each sensing point according to the analog digital conversion level of each sensing point; and scans the touch panel with the second voltage stimulation signal, according to each sensing point Analogizing the digital conversion level to obtain a second sensing value of each sensing point; wherein the second voltage is less than the first voltage; and determining whether the degree of difference falls within a pre-determination according to the degree of difference between the first sensing value and the second sensing value Set a good detection range; if it is, the test result is good.

The main technical means for achieving the above purpose is that the touch panel superiority and inferior detecting device comprises: a driving unit comprising a plurality of output terminals, wherein each output terminal is connected to each driving line of the touch panel; The driving unit has an analog-digital conversion characteristic adjustment program and a scan detection program, and the driving unit first performs the analog-to-digital conversion characteristic adjustment program, and then performs at least two scanning procedures, wherein in at least two scanning programs, The high-voltage stimulation signal is scanned, and then the voltage of the stimulation signal is gradually decreased, and the scanning process is performed in sequence; and a receiving unit includes a plurality of input terminals, and each input terminal is provided for the Each receiving line of the touch panel is connected; the receiving unit performs an analog digital conversion characteristic adjustment program after the driving unit, and senses and stores the analog digital conversion gear position of each sensing point, and uses the same analog number in each scanning program. The conversion gear shifts the sensing value of each sensing point, and then compares the sensing value obtained by different scanning programs with the preset good detection range. If it falls within the preset good detection range, it represents the current touch panel. It is good; on the contrary, it is inferior.

The above-mentioned invention is not detected by the analog value of the analog digital conversion file but by the actual sensing value, and after multiple scanning with different voltage stimulation signals, the difference degree of the sensing values of the same sensing point is taken as the detection basis, and can be closer. Determine the detection result of touching the position of the object by drawing the line, and reduce the probability of eliminating the available touch panel.

The present invention is a method for detecting the advantages and disadvantages of a touch panel. First, referring to FIG. 1 , it is a flowchart of a preferred embodiment of the detection method of the present invention, which includes the following steps: performing analog digital conversion with an initial voltage stimulation signal The characteristic adjustment program is configured to obtain an analog digital conversion level S10 of each sensing point of the touch panel; the first voltage stimulating signal is used to scan the touch panel, and the analog digital conversion level is obtained according to the analog points of each sensing point, and the sensing points are obtained. a sensing value S11; scanning the touch panel with the second voltage stimulation signal, converting the grade according to the analog digits of each sensing point to obtain a second sensing value S12 of each sensing point; wherein the second voltage is smaller than the first Voltage, and first and second voltage The difference can be 1V, 2V, 3V. . . And determining whether the degree of difference falls within a predetermined good detection range according to the degree of difference between the first sensing value and the second sensing value; if yes, the detection result is good S13.

Referring to FIG. 2, it is a flowchart of a second preferred embodiment of the detection method of the present invention. The method includes the following steps: performing an analog digital conversion characteristic adjustment program by using an initial voltage stimulation signal to obtain each of the touch panels. The analog-to-digital conversion level of the sensing point is S21; the touch panel is scanned by the first voltage stimulation signal to obtain the first sensing value S22 of each sensing point; and the second voltage stimulation signal is used to scan the touch panel to Obtaining a second sensing value S23 of each sensing point; wherein the second voltage is less than the first voltage; and scanning the touch panel with the third voltage stimulation signal to obtain a third sensing value S24 of each sensing point; The third voltage is less than the second voltage; and determining whether the degree of difference falls within the preset good detection range corresponding to the difference between the first sensing value and the second sensing value and the difference between the second and third sensing values If it falls, the test result is good S25, and if it does not fall into or only falls into one of them, it is judged to be inferior.

According to the preferred embodiment of the above two detection methods, the present invention performs the analog digital conversion characteristic adjustment procedure after the touch panel to be detected, and then performs at least two scanning procedures with the same analog-to-digital conversion gear position, wherein at least two scanning procedures are performed. In the second scanning process, the high-frequency stimulation signal is first scanned, and then the voltage of the stimulation signal is gradually decreased, and the scanning process is performed sequentially. According to the degree of difference between the two sets of sensing values, compared with the preset good detection range, if it falls within the preset good detection range, it means that the current touch panel is good; otherwise, it is inferior.

Referring to FIG. 3, the detecting device for detecting the advantages and disadvantages of the touch panel of the present invention is characterized in that the touch panel 10 includes n driving lines and m receiving lines, and the detecting device includes There is: a driving unit 20, comprising a plurality of output terminals TX1~TXn, wherein the output terminals TX1~TXn are connected to the two ends of the driving lines of the touch panel 10; wherein the driving unit 20 has an analog-digital conversion The characteristic adjustment program and a scan detection program, the driving unit 20 first performs the analog digital conversion characteristic adjustment program with the highest voltage stimulation signal, and then performs at least two scanning procedures, wherein in at least two scanning programs, the first high The voltage stimulation signal is scanned, and then the voltage of the stimulation signal is gradually lowered into the (14V) line for several scanning procedures, as shown in FIG. 4, four scanning procedures are performed at 14V, 13V, 11V, and 8V, respectively; 30, comprising a plurality of input terminals RX1 R RXn, wherein the input terminals RX1 R RXn are connected to the two ends of the receiving lines RX1 R RXn of the touch panel 10; the receiving unit 30 performs an analog digital conversion on the driving unit 20 After the sexual adjustment procedure, the analog digital conversion gears of each sensing point are sensed and stored, and the sensing values of the sensing points are converted by the same analog digital conversion gear in each scanning program, and then the sensing is obtained according to different scanning procedures. The difference in value is compared with the preset good detection range. If it falls within the preset good detection range, it means that the current touch panel is good; otherwise, it is inferior.

Since the voltage of the stimulation signal of the invention is adjustable, and in the scanning process The sensing value of each sensing point is obtained according to the analog digital conversion conversion of each sensing point. Therefore, the present invention performs the analog digital conversion characteristic adjustment procedure with the highest voltage stimulation signal, so that each sensing point obtains a higher analog digital position. When the conversion level is changed, the subsequent stimulation of the lower voltage stimulation signal will not be able to obtain the correct sensing value due to saturation.

In addition, the preset good detection range described above may be a range of values. In actual application, the difference between the first and second sensing values may be directly taken, and compared with the preset value range to determine whether the difference falls within the preset numerical range; if it is judged to fall within the preset numerical range, it represents The sensing point is normal, otherwise it is abnormal. For example, if the 14V stimulation signal is used for scanning, the sensing value of the sensing point falls between 0x1200-0x1300, and then the scanning is performed with the 13V stimulation signal, and the sensing value of the sensing point falls between 0x1000-0x1100. Therefore, the preset value range is 0x100-0x300. If the first sensing value is deducted from the second sensing value below 0x100 or exceeds 0x300, it is regarded as abnormal.

In the following, the advantages and disadvantages of different touch panels are further tested by the present invention. First, an analog digital conversion characteristic adjustment procedure is performed on the good touch panel 10a shown in FIG. 8 to obtain an analog digital conversion characteristic of each sensing point. The grade (as shown in Figure 9), and then the first scanning program is performed with the highest pressure stimulation signal, and the analog digital conversion level is matched to convert and obtain the first sensing value of each sensing point, as shown in Fig. 5A; Each sensing point is between 0x1200 and 0x1300; and the second scanning process is performed with a 13V voltage stimulation signal, and the second sensing value of each sensing point can be obtained, as shown in FIG. 5B, wherein each sensing point is about 0x1000-0x1100. And then subtracting the first and second sensing values of the sensing points to obtain the sensing difference value as shown in FIG. 5C, and comparing the sensing difference of each sensing point to a preset value range (0x100-0x300), the detection result of the present invention represents that the current touch panel is a good product.

In order to make the detection result clearer, the third and fourth scanning procedures of the touch panel 10a can be performed again, that is, the 11V stimulation signal can be scanned to obtain the third sensing value, so that the 13V and 11V can be calculated. Inductive difference (as shown in Figure 5C); then the fourth scan program is performed with the 8V stimulus signal to obtain the fourth sensing value (as shown in Figure 5D) to calculate the sensing difference between 11V and 8V. . Since the voltage of the stimulation signal is different, the difference in the inductance is also different. Therefore, the sensing values after scanning with different voltage stimulation signals are subtracted, and the sensing difference is naturally different (as shown in FIGS. 6A, 6B and 6C). ); that is, the sensing value obtained by scanning the different voltage stimulation signals may be compared with the sensing difference value in the middle, and then reading the sensing difference range (preset value range) corresponding to the voltage difference of the different voltage stimulation signals. Yes, if they all meet the preset difference range, it means that the current touch panel is indeed a good product.

In the present invention, the touch panel 10b of the inferior product shown in FIG. 10 is detected. Since some of the driving lines 11 or the sensing lines 12 are disconnected or broken at both ends and cannot receive the stimulation signal or the sensing signal, the two ends are disconnected. Or the sensing point on the broken driving line 11 or the sensing line 12 will not be able to obtain the analog digital conversion level, or obtain an abnormal analog digital conversion level (as shown in FIG. 11), so the sensing points are scanned by different voltage stimulation signals. That is, the sensing value cannot be obtained, and no sensing difference is available for comparison, and it is surely out of the preset value range, and is judged to be inferior.

The touch panel 10c of FIG. 13 is further detected by the present invention. Since only a part of the driving lines 11 or the sensing lines 12 of the touch panel 10c are disconnected or broken at one end, However, after performing the analog-to-digital conversion characteristic adjustment procedure, the analog point on the single-ended broken or broken drive line 11 or the sensing line 12 can still obtain an analog digital conversion level (as shown in FIG. 14), so the voltage is stimulated with different voltages. After the signal is scanned, the sensing points can still obtain the normal sensing value; therefore, the sensing difference of the sensing points (as shown in FIGS. 7A, 7B and 7C) will fall within the preset value range. And this touch panel will judge as good, not inferior.

As can be seen from the above description, since the touch panel of the present invention first performs an analog digital conversion characteristic adjustment procedure, at least two scanning procedures are respectively performed, wherein in the secondary scanning procedure, the high voltage stimulation signal is first scanned. Then, scanning with a lower voltage stimulation signal, so that each sensing point obtains two sets of sensing values respectively, and then compares with the preset good detection range according to the difference degree of the two sets of sensing values, and if it falls into the preset good detection In the range, it means that the current touch panel is good; otherwise, it is inferior; because the invention is not based on the analog digital value, but the actual sensing value, plus the stimulation signal with different voltages. After the second scan, the difference of the sensing values of the same sensing point is taken as the detection basis, and the detection result of the position of the touching object can be judged closer to the drawing line, and the probability of eliminating the available touch panel is reduced.

10, 10a, 10b, 10c‧‧‧ touch panel

11‧‧‧Drive line

12‧‧‧Induction line

20‧‧‧Drive unit

30‧‧‧ Receiving unit

50a, 50b‧‧‧ display

Figure 1 is a flow chart of a preferred embodiment of the detection method of the present invention.

Figure 2 is a flow chart showing another preferred embodiment of the detection method of the present invention.

Figure 3 is a schematic illustration of the detection device of the present invention.

Fig. 4 is a timing chart showing the output of different voltage stimulation signals by the driving unit of the detecting device of the present invention.

5A to 5D are diagrams showing the sensing values obtained by scanning the touch panel of FIG. 10 with different voltage stimulation signals according to the detection method of the present invention.

Figure 6A is a graph showing the difference in inductance of the sensed values of Figures 5A and 5B.

Figure 6B is a graph showing the difference in inductance of the sensed values of Figures 5B and 5C.

Figure 6C is a graph showing the difference in inductance of the sensed values of Figures 5C and 5D.

7A to 7C are diagrams showing the difference between the sensing values of the sensing method of the present invention by scanning the touch panel of FIG. 13 with different voltage stimulation signals.

Figure 8: A schematic diagram of a good touch panel.

Figure 9 is a numerical diagram of the analog-to-digital conversion gear of Figure 8.

Figure 10: Schematic diagram of a poor quality touch panel.

Figure 11 is a numerical diagram of the analog-to-digital conversion gear position of Figure 10.

Figure 12: Figure 10 is a schematic diagram showing the touch object in combination with the display.

Figure 13: Schematic diagram of a half-good touch panel.

Figure 14 is a numerical diagram of the analog-to-digital conversion gear position of Figure 13.

Figure 15: Figure 13 is a schematic diagram showing the touch object in line with the display.

Claims (38)

A method for detecting the quality of the touch panel by using different voltage stimulation signals, comprising: performing an analog digital conversion characteristic adjustment program by using an initial voltage stimulation signal to obtain an analog digital conversion level of each sensing point of the touch panel; and stimulating the signal pair with the first voltage The touch panel performs a first scanning process, and obtains a first sensing value of each sensing point according to an analog digital conversion level of each sensing point; after the first scanning process, a second voltage different from the first voltage is further used. The stimulating signal performs a second scanning process on the touch panel, and converts the grade according to the analog digits of each sensing point to obtain a second sensing value of each sensing point; and determines whether the touch panel is superior or inferior according to the first sensing value. The degree of difference from the second sensing value determines whether the degree of the difference falls within a predetermined good detection range; if so, the detection result is good. The touch panel detection method according to claim 1, wherein the second voltage is smaller than the first voltage. The method for detecting the advantages and disadvantages of the touch panel according to claim 2, further comprising: scanning the touch panel with the third voltage stimulation signal according to the step of determining the advantages and disadvantages of the touch panel, and converting the analog pixels according to the analog points of each sensing point a grade to obtain a third sensed value of each sensing point; wherein the third voltage is less than the second voltage. The method for detecting the quality of the touch panel described in claim 3 is to determine whether the degree of difference falls within another preset good detection according to the difference between the second sensing value and the third sensing value in the step of determining the quality of the touch panel. Fan If it is, the test result is good. The method for detecting the quality of the touch panel according to claim 3, wherein the voltage difference between the first voltage and the second voltage is less than the voltage difference between the second voltage and the third voltage. The method for detecting the quality of the touch panel according to claim 2, wherein the difference between the first and second sensing values is a difference between the first and second sensing values. The method for detecting the quality of the touch panel according to claim 6, wherein the preset good detection range is a preset value range. The method for detecting the quality of the touch panel according to claim 7, wherein the preset digit range is a range of the sensing difference corresponding to the voltage difference between the first voltage and the second voltage. The method for detecting the quality of the touch panel according to claim 3 or 4, wherein the difference between the second and third sensing values is a difference between the second and third sensing values. The touch panel pros and cons detection method according to claim 9, wherein the preset good detection range is a preset value range. The method for detecting the quality of the touch panel according to claim 10, wherein the preset digit range is a range of the sensing difference corresponding to the voltage difference between the second and third voltages. The touch panel pros and cons detection method according to any one of claims 1 to 8, wherein the initial voltage is not less than the first voltage. A touch panel superiority and inferior detecting device, wherein the touch panel comprises n driving lines and m receiving lines to form a plurality of sensing points, and the detecting device comprises: a driving unit, comprising a plurality of output ends, each The output is for this Each driving line of the touch panel is connected; wherein the driving unit has an analog digital conversion characteristic adjustment program and a scan detection program, and the driving unit first performs the analog digital conversion characteristic adjustment program, and then performs a second scanning procedure. a voltage stimulating signal, after performing the first scanning process on the touch panel, performing a second scanning process on the touch panel with a second voltage stimulating signal different from the first voltage; and a receiving unit The input terminal is connected to each receiving line of the touch panel; after receiving the analog digital conversion characteristic adjustment program, the receiving unit senses and stores the analog digital conversion gear of each sensing point. And obtaining, in the first and the second scanning procedures, the first and second sensing values of each sensing point by using the same analog-to-digital conversion position, and then according to the first and second The difference degree of the sensing value is compared with a preset good detection range. If it falls within the preset good detection range, it means that the current touch panel is good; Of, it was inferior. The detecting device of claim 13, wherein the second voltage is less than the first voltage. The detecting device of claim 14, wherein each output end of the driving unit is connected to two ends of each driving line of the touch panel, and each input end of the receiving unit is provided for each receiving line of the touch panel. End connection. The detecting device according to claim 15, wherein the driving unit executes the analog digital conversion characteristic adjusting program, performs the highest voltage stimulation signal, and executes the first scanning process with the highest voltage stimulation signal. The detecting device according to any one of claims 14 to 16, wherein the receiving unit determines that the degree of difference in the sensed value is a difference between the sensed values before and after. The detecting device according to claim 17, wherein the preset good detection range is a preset value range. The detecting device according to claim 18, wherein the preset value range is a range of sensing differences corresponding to the voltage difference between the first and second voltages. A method for detecting the quality of the touch panel by using different voltage stimulation signals includes: performing a first scanning process on the touch panel with the first voltage stimulation signal to obtain a first sensing value of each sensing point; after the first scanning procedure And performing a second scanning process on the touch panel with a second voltage stimulation signal different from the first voltage to obtain a second sensing value of each sensing point; and determining whether the touch panel is superior or inferior according to the first sensing value The degree of difference from the second sensing value determines whether the degree of the difference falls within a predetermined good detection range; if so, the detection result is good. The touch panel detection method according to claim 20, wherein the second voltage is smaller than the first voltage. The method for detecting the quality of the touch panel according to claim 21, further comprising: scanning the touch panel with the third voltage stimulation signal to obtain the third sensing value of each sensing point before the step of determining the quality of the touch panel Wherein the third voltage is less than the second voltage. The method for detecting the quality of the touch panel described in claim 22 is to determine whether the degree of difference falls within another preset good detection according to the difference between the second sensing value and the third sensing value in the step of determining the quality of the touch panel. Range; if yes, the test result is good. The touch panel of any one of claims 21 to 23 In the step of scanning the touch panel by using the first voltage stimulation signal, the touch panel is performed by performing an analog digital conversion characteristic adjustment program on the touch panel with an initial voltage stimulation signal not less than the first voltage. The analog-to-digital conversion level of each sensing point is used to convert the sensing value in the analog digital conversion level of each sensing point in each scanning program. The method for detecting the quality of the touch panel according to claim 24, wherein the voltage difference between the first voltage and the second voltage is less than the voltage difference between the second voltage and the third voltage. The method for detecting the quality of the touch panel according to claim 21, wherein the difference between the first and second sensing values is a difference between the first and second sensing values. The method for detecting the quality of the touch panel according to claim 26, wherein the preset good detection range is a preset value range. The method for detecting the quality of the touch panel according to claim 27, wherein the preset value range is based on a range of the sensing difference corresponding to the voltage difference between the first and second voltages. The method for detecting the quality of the touch panel according to claim 23, wherein the difference between the second and third sensing values is a difference between the second and third sensing values. The method for detecting the quality of the touch panel according to claim 29, wherein the preset good detection range is a preset value range. The method for detecting the quality of the touch panel according to claim 30, wherein the preset good detection range is based on a range of the sensing difference corresponding to the voltage difference between the second and third voltages. Touch panel pros and cons detecting device, wherein the touch panel is packaged The plurality of sensing lines and the m receiving lines form a plurality of sensing points, and the detecting device comprises: a driving unit, comprising a plurality of output ends, wherein the output ends are connected to the driving lines of the touch panel; The driving unit first performs a first scanning process on the touch panel with a first voltage stimulation signal, and then performs a second scanning process on the touch panel with a second voltage stimulation signal different from the first voltage; And a receiving unit, comprising: a plurality of input ends, wherein each input end is connected to each receiving line of the touch panel; and the receiving unit obtains the first of the sensing points in the first time and the second scanning process The first and second sensing values are compared with the preset good detection range according to the difference between the first sensing value and the second sensing value, and if the difference falls within the preset good detection range, it represents the current Wait for the touch panel to be good; otherwise, it is inferior. The detecting device of claim 32, wherein the second voltage is less than the first voltage. The detecting device of claim 33, the driving unit performs an analog-to-digital conversion characteristic adjustment program before the scanning process, and the receiving unit senses and stores the analog digital conversion gears of each sensing point for each scanning procedure. The same analogy digital conversion position is used to convert the sensing value of each sensing point. The detecting device of claim 34, wherein the driving unit performs the analog digital conversion characteristic adjustment program by using the highest voltage stimulation signal. The detecting device according to any one of claims 32 to 35, wherein the receiving unit determines that the difference degree of the sensing value is a difference between the first and second sensing values. The detecting device according to claim 36, wherein the preset good detection range is a preset value range. The detecting device of claim 37, wherein the preset value range is a range of sensing differences corresponding to voltage differences of different voltage stimulation signals according to the first and second scanning procedures.