CN214409487U - Measuring device for binding impedance of display panel - Google Patents
Measuring device for binding impedance of display panel Download PDFInfo
- Publication number
- CN214409487U CN214409487U CN202120297908.9U CN202120297908U CN214409487U CN 214409487 U CN214409487 U CN 214409487U CN 202120297908 U CN202120297908 U CN 202120297908U CN 214409487 U CN214409487 U CN 214409487U
- Authority
- CN
- China
- Prior art keywords
- impedance
- display panel
- measuring
- chip
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The embodiment of the utility model provides a measuring device that display panel binds impedance, including impedance measurement unit, driver chip, cover brilliant film, flexible circuit board and display panel, impedance measurement unit set up in on the driver chip, driver chip with cover brilliant film electricity and connect, flexible circuit board with display panel passes through cover brilliant film connects. By adding the impedance measuring unit in the driving chip, the driving chip can be used for measuring the bound impedance of the chip on film, the display panel, the flexible circuit board and the chip on film, the bound impedance measuring process is simplified, and additional production sites and measuring equipment are not required to be added.
Description
Technical Field
The utility model relates to a measuring device especially indicates a display panel binds measuring device of impedance.
Background
Chip-on-glass (COG) and flexible printed circuit (FPC-on-glass (FOG)) packaging technologies are widely used in liquid crystal modules. In the process of detecting the liquid crystal module, the contact impedance condition of the COG/FOG joint of the module needs to be detected, and the contact impedance condition of the joint is recorded.
In the production process of the display panel, in order to ensure the yield of the subsequent process and better monitor the production state, the bound impedance is measured and data is uploaded after the binding is completed, wherein the binding includes the binding of the panel and a COF (Chip on film) or a driver IC, and the binding of a FPC (Flexible Printed Circuit) and a COF.
In the prior art, a site is added, and an automatic measuring device is used for measuring the reserved test point on the FPC to measure the impedance. This detection method requires additional equipment and production sites, is cost-effective, and cannot realize real-time impedance measurement.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem who solves is: the existing detection mode needs additional equipment and production sites, and is high in cost and low in efficiency.
In order to solve the technical problem, the embodiment of the utility model provides an adopt technical scheme is:
the embodiment of the utility model provides a measuring device that display panel binds impedance, including impedance measurement unit, driver chip, cover brilliant film, flexible circuit board and display panel, impedance measurement unit set up in on the driver chip, driver chip with cover brilliant film electricity and connect, flexible circuit board with display panel passes through cover brilliant film connects.
Furthermore, there are two groups of impedance measuring units.
Furthermore, each group of impedance measurement unit comprises a constant voltage source, a first resistor, a second resistor, a first analog-digital converter, a second analog-digital converter, an impedance calculation module and a register, wherein the constant voltage source is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, two ends of the first resistor are connected in parallel with the impedance calculation module through the first analog-digital converter and the second analog-digital converter, and the impedance calculation module is connected with the register.
Further, the other end of the second resistor is grounded.
Furthermore, a connector is arranged on one side of the flexible circuit board, and the connector is connected with the PC end through an interface.
Further, the interface comprises a mipi interface.
The embodiment of the utility model provides a beneficial effect lies in: the embodiment of the utility model provides a measuring device that display panel binds impedance, including impedance measurement unit, driver chip, cover brilliant film, flexible circuit board and display panel, impedance measurement unit set up in on the driver chip, driver chip with cover brilliant film electricity and connect, flexible circuit board with display panel passes through cover brilliant film connects. By adding the impedance measuring unit in the driving chip, the driving chip can be used for measuring the bound impedance of the chip on film, the display panel, the flexible circuit board and the chip on film, the bound impedance measuring process is simplified, and additional production sites and measuring equipment are not required to be added.
Drawings
The following detailed description of the embodiments of the present invention with reference to the drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an impedance measuring unit according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, an embodiment of the present invention provides a measurement apparatus for binding impedance of a display panel, including an impedance measurement unit 1, a driving chip 2, a chip on film 3, a flexible circuit board 4 and a display panel 5, wherein the impedance measurement unit 1 is disposed on the driving chip 2, the driving chip 2 is electrically connected to the chip on film 3, and the flexible circuit board 4 is connected to the display panel 5 through the chip on film 3.
In this embodiment, the flexible circuit board 4 is bonded to the chip on film 3, the display panel 5 is bonded to the chip on film 3, and compared with the existing method of adding a station and measuring the impedance by using an automatic measuring device to measure the reserved test points on the flexible circuit board 4, in this embodiment, the impedance measuring unit 1 is added in the driver chip 2, so that the driver chip 2 can be used to measure the bonding impedance between the chip on film 3 and the display panel 5, and between the flexible circuit board 4 and the chip on film 3, and the bonding impedance measuring process is simplified without adding additional production stations and measuring devices, thereby reducing the cost.
Further, there are two sets of impedance measuring units 1. The two groups of impedance measuring units 1 can be used for measuring the bound impedance between the chip on film 3 and the display panel 5 and between the flexible circuit board 4 and the chip on film 3 respectively, so that a better measuring effect is achieved, and data are more accurate.
Further, referring to fig. 2, each of the impedance measuring units 1 includes a constant voltage source V, a first resistor R1, a second resistor R2, a first ADC1, a second ADC2, an impedance calculating module 11 and a register 12, the constant voltage source V is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2, two ends of the first resistor R1 are connected in parallel to the impedance calculating module 11 through the first ADC1 and the second ADC2, and the impedance calculating module 11 is connected to the register 12.
Further, the other end of the second resistor R2 is grounded.
In this embodiment, the first resistor R1 is a precision resistor, when the impedance measuring unit 1 receives a measurement command, the constant voltage source V, the first analog-to-digital converter ADC1 and the second analog-to-digital converter ADC2 are started, the voltages V1 and V2 at two ends of the precision resistor are detected at the same time, and the result is stored in the register 12 according to the ohm law I (V1-V2)/R1 and the second resistor (binding resistor) R2 (V2/I), wherein the register 12 inputs the command into the impedance calculating module 11, and the impedance calculating module 11 outputs the measurement result to the register 12. The register 12 is mainly used for temporarily storing data participating in an operation and an operation result, and has functions of receiving data, storing data, and outputting data. The register 12 has very high read-write speed, and the data transmission between the registers 2 is very fast; the impedance calculation module 11 is configured to detect voltages V1 and V2 at two ends of the precision resistor, and calculate impedances of the first resistor R1 and the second resistor R2 according to ohm's law I (V1-V2)/R1 and the second resistor (binding resistor) R2 (V2/I). The first and second analog-to-digital converters ADC1 and ADC2 sample the input analog signal at predetermined time intervals and compare the sampled signal with a series of standard digital signals, and the digital signals are converged one by one until the two signals are equal to each other, and then a binary number representing the signal is displayed.
In this embodiment, the resistance is calculated by detecting the precise resistance inside the driving chip 2, which is more simplified than the conventional method of calculating the resistance by outputting different voltage sources.
Further, referring to fig. 1, a connector 6 is disposed on one side of the flexible circuit board 4, and the connector 6 is connected to the PC terminal through an interface.
In this embodiment, the PC sends an impedance measurement command to the driver chip 2 through the interface, and the driver chip 2 returns measured impedance data to the PC through the same interface for storage after measuring the bound impedances of the flip chip 3 and the display panel 5 and the flexible circuit board 4 and the flip chip 3. At any moment, the real-time impedance measurement can be carried out in a command issuing mode.
Further, the interface comprises a mipi interface. Likewise, other types of interfaces may be employed, not limited to the mipi interface.
It should be noted that the present invention is not only applicable to flip chip, but also applicable to cog (chip on glass) or cop (chip on plastic).
To sum up, the measuring device for the display panel bound impedance provided by the utility model simplifies the bound impedance measuring process without adding additional production sites and measuring equipment; at any moment, the real-time impedance measurement can be carried out in a command issuing mode.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (6)
1. A device for measuring the bound impedance of a display panel is characterized in that: the impedance measuring unit is arranged on the driving chip, the driving chip is electrically connected with the chip on film, and the flexible circuit board is connected with the display panel through the chip on film.
2. The apparatus for measuring the bound impedance of a display panel as claimed in claim 1, wherein: there are two sets of impedance measurement units.
3. The apparatus for measuring the bound impedance of a display panel as claimed in claim 2, wherein: every group impedance measurement unit includes constant voltage source, first resistance, second resistance, first analog-to-digital converter, second analog-to-digital converter, impedance calculation module and register, the constant voltage source with the one end of first resistance is connected, the other end of first resistance with the one end of second resistance is connected, first resistance both ends are passed through first analog-to-digital converter, second analog-to-digital converter with impedance calculation module parallel connection, impedance calculation module with the register is connected.
4. The apparatus for measuring the bound impedance of a display panel as claimed in claim 3, wherein: the other end of the second resistor is grounded.
5. The apparatus for measuring the bound impedance of a display panel as claimed in claim 4, wherein: and one side of the flexible circuit board is provided with a connector, and the connector is connected with the PC end through an interface.
6. The apparatus for measuring the bound impedance of a display panel as claimed in claim 5, wherein: the interface comprises a mipi interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120297908.9U CN214409487U (en) | 2021-02-02 | 2021-02-02 | Measuring device for binding impedance of display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120297908.9U CN214409487U (en) | 2021-02-02 | 2021-02-02 | Measuring device for binding impedance of display panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214409487U true CN214409487U (en) | 2021-10-15 |
Family
ID=78021085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120297908.9U Expired - Fee Related CN214409487U (en) | 2021-02-02 | 2021-02-02 | Measuring device for binding impedance of display panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214409487U (en) |
-
2021
- 2021-02-02 CN CN202120297908.9U patent/CN214409487U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9013197B2 (en) | Chip on glass substrate and method for measuring connection resistance of the same | |
| US7834972B2 (en) | Display circuits | |
| CN108594017B (en) | Bonding impedance detection system and method | |
| CN107610625B (en) | Bound impedance testing device and bound impedance testing method | |
| US20120161660A1 (en) | Driving Integrated Circuit and Display Apparatus Including the Same | |
| CN113160729B (en) | Display module, test method thereof and display device | |
| CN101442312A (en) | Analog to digital converter | |
| CN206179483U (en) | LCD module's test keysets | |
| CN203055406U (en) | Signal line detecting device and display device for substrate | |
| US20150160276A1 (en) | System for inspecting display panel | |
| CN101661418A (en) | Keyboard testing system | |
| CN104807594A (en) | Automatic measuring system based on matrix switch | |
| CN106932643A (en) | A kind of binding effect detection device and detection method for AMOLED products | |
| CN203949973U (en) | A kind of impedance measurement device | |
| CN214409487U (en) | Measuring device for binding impedance of display panel | |
| CN102339251A (en) | Test system and USB (universal serial bus) interface test connection card thereof | |
| CN101846709A (en) | Short circuit test board for circuit of flexible circuit board and test method thereof | |
| CN101680923B (en) | Electronic device and electronic device testing method | |
| CN205506989U (en) | Point screen tool | |
| CN104569605A (en) | FOG bonding structure impedance detection circuit and method | |
| CN104090167A (en) | Impedance measuring device and method of liquid crystal module | |
| CN204463780U (en) | Short bar tool | |
| WO2023206894A1 (en) | Driving chip, display apparatus and bonding resistor test system | |
| CN207965406U (en) | Measurement jig and test system | |
| TW200821597A (en) | Bonding impedance detecting method for integrated circuit system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211015 Termination date: 20220202 |