JP2012059054A - Manufacturing method for display with touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a display with a resistive film touch panel in which a position input process such as touching a specific point on the touch panel is omitted and inspection of a touch function of the display with the touch panel is simplified to reduce the number of processes and its cost.SOLUTION: A resistive film touch panel is attached to a top face of a display. When the resistive film touch panel is in a static state, each terminal is connected to an inspection circuit and then power source voltage is applied to determine whether each divided voltage potential of an X-axis terminal and a Y-axis terminal is within a specification range.

Description

  The present invention relates to a method for manufacturing a display device mounted with a resistive touch panel used in an electronic terminal such as a mobile phone or an electronic dictionary.

  In recent years, electronic terminal devices such as mobile phones and electronic dictionaries in which a resistive touch panel is mounted on the surface of a display device have been widely used. Conventionally, in the manufacturing method of a display device incorporating a resistive touch panel, the position information data that is discharged when a specific point in the recognition effective area on the touch panel is touched with a finger or a touch pen in the touch function inspection process is analyzed. A method for determining whether the touch panel function is good or bad using an inspection apparatus that performs the inspection is used. In such an inspection apparatus, a power supply voltage is applied to a resistance film type touch panel including a first resistance film having a pair of X electrodes and a second resistance film having a pair of Y-axis electrodes, and corresponds to a predetermined input position. It is known to inspect electrical characteristics by measuring a power voltage value (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-274225 (FIG. 1)

  However, in the conventional manufacturing method, in order to touch a specified point on the touch panel, an inspection apparatus having a mechanical mechanism structure and an input operation of a detection position by manual work are required. For this reason, the mechanism of the apparatus used for the inspection is complicated, and an expensive apparatus must be used. In addition, the number of processes has increased, such as the generation of work man-hours due to input of detection positions.

  A resistance film type touch panel is attached to the upper surface of the display device, and whether or not the resistance between the terminals of each resistance film in the static state of the resistance film type touch panel is within a standard range is determined using an inspection circuit. That is, the X-axis terminal and the Y-axis terminal of each resistance film of the resistance film type touch panel are respectively connected to the inspection circuit, and the power supply voltage is applied. Then, the power supply voltage is resistance-divided by the inter-terminal resistance and the external resistance, and the divided potential of the X-axis terminal and the divided potential of the Y-axis terminal are set. Further, the divided potential and the upper limit voltage and the lower limit voltage generated by the variable resistor in the inspection circuit are determined by a comparator.

  According to the manufacturing method of the present invention, manual position input work is not required, and the touch function inspection of the display device with a touch panel can be simplified, and the number of steps and cost can be reduced.

It is a top view which shows typically the structure of the display apparatus with a touchscreen of this invention. It is a figure which shows the test | inspection circuit used for the manufacturing method of the display apparatus with a touchscreen of this invention.

  In the method for manufacturing a display device with a touch panel according to the present invention, a resistive film type touch panel having a first resistive film provided with a pair of X-axis terminals and a second resistive film provided with a pair of Y-axis terminals is an upper surface of the display device. Are pasted together. And a test | inspection of a touch function or a terminal connection state is implemented by performing standard determination about the resistance between terminals of each resistive film in the static state of this resistive touch panel.

  In the inspection process, each terminal provided on each resistive film of the resistive touch panel is connected to an inspection circuit and applied with a power supply voltage. Then, it is determined whether or not the divided potential at the X-axis terminal and the divided potential at the Y-axis terminal are within the standard range.

  The divided potential at the X-axis terminal and the divided potential at the Y-axis terminal are set by dividing the power supply voltage by resistance between terminals and external resistance, respectively.

  In addition, a variable resistor is provided in the inspection circuit, and an upper limit potential and a lower limit potential that are within a standard range are set. The divided potential of the X axis terminal and the divided potential of the Y axis terminal are the upper limit potential and the lower limit potential. It is judged whether it is in the range.

  Such a manufacturing method can detect not only the inspection of the touch function, but also the conduction failure such as disconnection or short circuit of the touch panel circuit and the deterioration of the static function that have occurred in the process of incorporating the resistive touch panel into the product.

  A manufacturing method of the display device with a touch panel of this embodiment will be described with reference to FIGS. FIG. 1 is a top view showing a configuration of a display device 4 with a touch panel according to the present embodiment. A resistive touch panel 1 is attached to the upper surface of the display device 2, and a touch panel terminal substrate 3 is drawn from the resistive touch panel 1. In the manufacturing method of this embodiment, first, the resistive touch panel 1 provided with the touch panel terminal substrate 3 is attached to the upper surface of the display device 2. The display device 2 and the resistive film type touch panel 1 may be attached using an optical adhesive. The resistive film type touch panel 1 is formed such that a first resistive film having a pair of X-axis terminals and a second resistive film having a pair of Y-axis terminals are opposed to each other.

  Next, an inspection circuit is connected to each terminal (not shown) of the terminal board 3 of the resistive touch panel 1. At this time, the resistive touch panel 1 is in a static state. The inspection circuit divides the potential difference between the power supply voltage with reference to the ground potential by the resistance between the terminals of each resistance film of the touch panel and the external resistance provided in the inspection circuit. The divided voltage value is designed to be individually standard-determined by comparing with a separately set upper limit voltage and lower limit voltage by a comparator circuit. Then, the touch function of the resistive touch panel 1 is inspected by this inspection circuit.

  Next, the inspection method will be described in detail with reference to FIG. FIG. 2 is a diagram showing the configuration of the inspection circuit of this embodiment. Here, the terminals connected to the inspection circuit are YU terminals, YD terminals, XL terminals, and XR terminals.

  First, the YU terminal 20 and the YD terminal 21 are connected to the touch panel Y direction resistor 10 between the reference power source 24 and the GND 25, and the voltage of the reference power source 24 is divided by the voltage dividing resistor 30 and the touch panel Y direction resistor 10. In this embodiment, the voltage of the reference power supply 24 is set to 5.0V. Here, since the reference power supply 24 is a high-precision voltage and the voltage dividing resistor 30 is a high-precision fixed resistor, the divided potential of the YU terminal 20 is a high-precision potential that is directly proportional to the touch panel Y-direction resistance 10. It becomes. The divided potential of the YU terminal 20 is compared and determined by the comparator 40 with the upper limit standard potential adjusted and set by the standard setting variable resistor 33, and further adjusted and set by the standard setting variable resistor 34. The potential is compared with the comparator 41 for determination. When the divided potential of the YU terminal 20 is within the standard, the comparator 40 and the comparator 41 output the Hi level, and the AND gate 44 outputs the Hi level.

  Similarly, the XL terminal 22 and the XR terminal are connected to the touch panel X direction resistor 11, and the voltage of the reference power supply 24 is divided by the voltage dividing resistor 31, the voltage dividing resistor 32, and the touch panel X direction resistor 11. A high-precision fixed resistor is used for the voltage-dividing resistor 31 and the voltage-dividing resistor 32, and the potential of the divided XR terminal is a high-precision potential that is directly proportional to the touch panel X-direction resistor 11. The divided potential of the XR terminal is compared and determined by the comparator 42 with the upper limit standard potential adjusted and set by the standard setting variable resistor 35, and further adjusted and set by the standard setting variable resistor 36. And the comparator 43 makes a comparison determination. When the divided potential of the XR terminal is within the standard, the comparator 42 and the comparator 43 output the Hi level, and the AND gate 45 outputs the Hi level.

  When the determination results in both the X direction and the Y direction are good, the Hi level is also output from the AND gate 46 and the LED 48 is lit through the current limiting resistor 47, so that it can be determined as good by visual observation. If there is an abnormality in either or both of the touch panel Y-direction resistance 10 and the touch panel X-direction resistance 11, a low level is output from the AND gate 46, and the LED 48 is not lit, so that it can be determined as defective.

  Further, the inspection circuit may be connected to the automatic determination system. The automatic determination of the touch panel inspection can be realized by fetching the comprehensive determination result 50 into the input port on the inspection system side. In this case, even if there is a defect in the inspection system, the LED 48 is not turned on as in the case of the defect determination, so that a system defect can be detected early.

  2, when different types of touch panel products are inspected using the inspection circuit of FIG. 2, the setting values of the standard setting variable resistors 33, 34, 35, and 36 are changed to change the different types of touch panel products. It is possible to correspond to the inspection.

  Thus, in the above-described manufacturing method, it is not necessary to touch the touch panel structure 61 with a stylus pen or the like, and the viewing angle is not obstructed, so that the display image can be inspected at the same time, and the inspection man-hours can be reduced. Moreover, it is not necessary to manually touch the designated point on the touch panel, and the time required for determination can be shortened.

  In addition, when the touch panel X-direction resistance 11 is determined, a voltage dividing resistor is arranged on both the reference power supply 24 side and the GND 25 side, so that the range of the standard potential used for the determination can be freely set. By adjusting the set value of the standard potential, it is possible to detect a short circuit between the YU terminal 20, the YD terminal 21, the XL terminal 22, and the XR terminal 23. As a result, it is possible to detect problems such as opening and short-circuiting of the touch panel terminals that occur during processing such as solder mounting.

  It can be used for inspection of electronic equipment with a resistive touch panel.

DESCRIPTION OF SYMBOLS 1 Resistance film type touch panel 2 Display apparatus 3 Touch panel terminal board 10 Touch panel Y direction resistance 11 Touch panel X direction resistance 20 YU terminal 21 YD terminal 22 XL terminal 23 XR terminal 24 Reference power supply 25 GND
30, 31, 32 Voltage dividing resistor 33, 34, 35, 36 Standard setting variable resistor 40, 41, 42, 43 Comparator 44, 45, 46 AND gate 47 Current limiting resistor 48 LED
50 Comprehensive judgment result 61 Touch panel structure 62 Display device 63 Touch panel terminal board

Claims (3)

With a touch panel in which a resistance film type touch panel in which a first resistance film provided with a pair of X-axis terminals and a second resistance film provided with a pair of Y-axis terminals are opposed to each other is bonded to the upper surface of the display device In the manufacturing method of the display device,
The pair of X-axis terminals and the pair of Y-axis terminals are connected to an inspection circuit and a power supply voltage is applied, and whether the divided potential of the X-axis terminal and the divided potential of the Y-axis terminal are within the standard range, respectively The manufacturing method of the display apparatus with a touch panel which test | inspects the function and connection state of the said resistive film type touch panel by determining whether or not.   2. The divided potential of the X-axis terminal and the divided potential of the Y-axis terminal are potentials obtained by dividing the power supply voltage by an inter-terminal resistance and an external resistance, respectively. Manufacturing method of display device with touch panel. In the inspection circuit, an upper limit potential and a lower limit potential for the divided potential of the X-axis terminal and the divided potential of the Y-axis terminal are set by a variable resistor,
3. The touch panel according to claim 1, wherein it is determined whether the divided potential of the X-axis terminal and the divided potential of the Y-axis terminal are within the upper limit potential and the lower limit potential, respectively. A method for manufacturing an attached display device.

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