Electronic paper display module, VCOM uniformity control method for electronic paper display module

Abstract

The present invention relates to an electronic paper display module and a method for controlling the VCOM uniformity of the electronic paper display module. Among them, the electronic paper display module includes a glass backplane, a display area is provided on the glass backplane, a common electrode is provided in the display area, and a driving IC module electrically connected to the display area is further provided on the glass backplane. A driving waveform for controlling the display area is configured in the driving IC module. Among them, the electronic paper display module further includes a plurality of voltage sensors, and the plurality of voltage sensors are arranged in sub-regions at the common electrode, and each voltage sensor is connected to the driving IC module through a wire. This application can detect the VCOM voltage of each different block of the common electrode, and then obtain and determine the optimal VCOM voltage value through the VCOM uniformity control method, thereby improving the display quality of the electronic paper display module.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and specifically to an electronic paper display module and a method for controlling the VCOM uniformity of an electronic paper display module. Background Art

[0002] Electronic paper is a technology that drives electronic ink through an array substrate to achieve black-and-white or color display. Due to its extremely low power consumption and the advantage of being suitable for human eyes to read, it has gradually attracted people's attention. In order to promote paperless, electronic billboards such as electrophoretic display devices (EPDs) or electronic paper display devices can replace traditional printed billboards. Electronic billboards are not only light in weight and thin in thickness but also flexible, so they have been quickly promoted to fields such as electronic tags, billboards, word cards, digital name tags, digital table cards, subway pull rings, and digital currencies. As a result, the requirements for the display quality of electronic paper display modules are even higher. One of the factors affecting the display quality of electronic paper display modules lies in the part of the common electrode. Since there are differences in the impedance of the common electrode on the entire glass backplane, there will be certain differences in the VCOM voltage values in different regions at the common electrode, which in turn leads to the problem of uneven display.

[0003] Therefore, how to improve the structure of the electronic paper display module and how to more optimally determine the optimal value of the VCOM voltage are the technical problems that need to be solved currently. Summary of the Invention

[0004] The purpose of the present invention is to provide an electronic paper display module that can detect the VCOM voltage of each different block of the common electrode, and then determine the optimal VCOM voltage value through the VCOM uniformity control method, thereby improving the display quality of the electronic paper display module.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] The present invention provides an electronic paper display module. The electronic paper display module includes a glass backplane, a display area is provided on the glass backplane, a common electrode is provided in the display area, and a driving IC module electrically connected to the display area is further provided on the glass backplane. A driving waveform for controlling the display area is configured in the driving IC module. Among them, the electronic paper display module further includes a plurality of voltage sensors, and the plurality of voltage sensors are arranged in sub-regions at the common electrode, and each voltage sensor is connected to the driving IC module through a wire.

[0007] For the above technical solution, the applicant has further optimization measures.

[0008] Optionally, the common electrode is evenly divided into a six-grid block or a nine-grid block, and a voltage inductor for detecting the VCOM voltage is respectively arranged in each grid block.

[0009] Further, the voltage inductor is arranged at the center position of each grid block.

[0010] Furthermore, the impedances of the respective wires connecting the respective voltage inductors to the driving IC module are equal.

[0011] Specifically, the present invention provides a method for controlling the VCOM uniformity of an electronic paper display module. The common electrode is evenly divided into multiple grid blocks, and voltage inductors are respectively arranged in each grid block. The driving IC module of the electronic paper display module leads out multiple wires, and each wire is respectively connected to a voltage inductor. The VCOM uniformity control method includes the following processing steps:

[0012] Turn on the electronic paper display module, and each voltage inductor respectively reads the VCOM voltage value of the voltage inductor in each grid block and feeds it back to the driving IC module;

[0013] The driving IC module obtains the average value of all the feedback VCOM voltage values as the final VCOM voltage value;

[0014] Burn the final VCOM voltage value into the driving IC, and then turn off the electronic paper display module.

[0015] Optionally, when turning on the electronic paper display module to detect and feedback the VCOM voltage values of each block, all the pixel points in the display area are turned on.

[0016] Optionally, the driving IC module calculates the difference between every two VCOM voltage values according to the collected VCOM voltage values. If the difference is greater than the threshold value, it is determined that the corresponding electronic paper display module is a defective product, wherein the threshold value is 0.15 - 0.25V.

[0017] Further, the common electrode is evenly divided into a six-grid block or a nine-grid block, and a voltage inductor for detecting the VCOM voltage is respectively arranged in each grid block.

[0018] Furthermore, the voltage inductor is arranged at the center position of each grid block.

[0019] Optionally, the impedances of the respective wires connecting the respective voltage inductors to the driving IC module are equal.

[0020] Compared with the prior art, the advantages of the present invention patent application are as follows:

[0021] For the electronic paper display module of the present application, by adding multiple voltage sensors to the common electrode within the display area on the glass backplane, it can detect the VCOM voltage values of different regions of the common electrode. The VCOM uniformity control method is based on the aforementioned structure, calculates an average value of the VCOM voltage as the standard VCOM voltage corresponding to the electronic paper display module, thereby improving the voltage consistency of a single electronic paper display module, and further improving the display uniformity of the electronic paper display module.

[0022] Meanwhile, the VCOM uniformity control method of the present application can more accurately determine the standard VCOM voltage of the electronic paper display module, reduce the difference between sheets of the electronic paper display module, and improve the uniformity of the electronic paper display modules of the same batch.

[0023] In addition, based on the detection of the VCOM voltage of each region, the difference between the VCOM voltage values of different regions is compared. If the difference is greater than the threshold, the product of the electronic paper display module is judged as a defective product, thereby improving the yield rate of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0025] Figure 1 is a schematic structural diagram of an electronic paper display module according to an embodiment of the present invention;

[0026] Figure 2 is a schematic processing flow diagram of a VCOM uniformity control method for an electronic paper display module according to another embodiment of the present invention.

[0027] The description of the reference numerals is as follows:

[0028] 1. Glass backplane, 2. Display area, 3. Common electrode, 4. Driver IC module, 5. Voltage sensor, 6. Conductive wire. Embodiments

[0029] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Embodiment

[0032] This embodiment describes an electronic paper display module. As Figure 1 shown, the electronic paper display module includes a glass backplane 1. A display area 2 is provided on the glass backplane 1. A common electrode 3 is provided in the display area 2. A driving IC module 4 electrically connected to the display area 2 is further provided on the glass backplane 1. A driving waveform for controlling the display area 2 is configured in the driving IC module 4. Among them, the electronic paper display module further includes a plurality of voltage sensors 5. The plurality of voltage sensors 5 are provided in a divided area at the common electrode 3. Each voltage sensor 5 is connected to the driving IC module 4 through a wire 6 respectively.

[0033] In this embodiment, the common electrode 3 is evenly divided into a nine-grid block. A voltage sensor 5 for detecting the VCOM voltage is provided in each block. The voltage sensor 5 is provided at the center position of each block. Of course, the block division of the common electrode 3 can be other numbers of blocks, such as a six-grid block, a twelve-grid block, etc. Considering cost and detection effectiveness and other aspects, this embodiment preferably divides it into a nine-grid block, which neither increases the cost by dividing it into more blocks nor reduces the detection accuracy due to too few divisions.

[0034] In order to ensure that the impedance from each block to the bottom driving IC module 4 is equal, so as to ensure that the consistency of the feedback VCOM voltage value is more accurate, in this embodiment, the impedances of the respective wires 6 connecting each voltage sensor 5 to the driving IC module 4 are set to be equal. Embodiment

[0035] This embodiment provides a method for controlling the VCOM uniformity of an electronic paper display module. The common electrode 3 is evenly divided into multiple grid blocks, and voltage sensors 5 are respectively arranged in each grid block. The driving IC module 4 of the electronic paper display module leads out multiple wires 6, and each wire 6 is respectively connected to a voltage sensor 5. The VCOM uniformity control method includes the following processing steps:

[0036] Turn on the electronic paper display module, and each voltage sensor 5 reads the VCOM voltage value of the voltage sensor 5 in each grid block and feeds it back to the driving IC module 4. Among them, when turning on the electronic paper display module to detect and feedback the VCOM voltage values of each block, all pixel points in the display area 2 are turned on;

[0037] The driving IC module 4 obtains the average value of all the feedback VCOM voltage values as the final VCOM voltage value;

[0038] Burn the final VCOM voltage value into the driving IC, and then turn off the electronic paper display module.

[0039] Specifically, when performing the detection and control of VCOM uniformity, as Figure 2 shown, first, the driving IC module 4 drives all pixel points in the display area 2 to turn on, and then scans each voltage sensor 5 at each grid block one by one and reads the VCOM voltage value fed back by each voltage sensor 5. After reading and recording the VCOM voltage values of each grid block, the average value of all the VCOM voltage values of the nine blocks is obtained through an average value calculation function such as a simple average function or a weighted average function. The obtained average value of the VCOM voltage value is used as the final VCOM voltage value. During the waveform debugging stage or the OTP stage, the previously obtained final VCOM voltage value is burned into the driving IC module 4, and after the burning is completed, all pixel points are turned off.

[0040] In addition, the driving IC module 4 calculates the difference between every two VCOM voltage values according to the collected VCOM voltage values. If the difference is greater than the threshold, it is determined that the corresponding electronic paper display module is a defective product. Among them, the threshold is 0.15 - 0.25V, and a further preferred threshold is 0.2V. Based on the detection of the VCOM voltage of each regional block, the difference between the VCOM voltage values of different blocks is compared. If the difference is greater than the threshold, it is determined that the product of the electronic paper display module is a defective product, thereby improving the yield rate of the final product.

[0041] In the electronic paper display module of this embodiment, by adding a plurality of voltage sensors 5 to the common electrode 3 in the display area 2 of the glass backplane 1, it is possible to detect the VCOM voltage values of different regions of the common electrode 3. The VCOM uniformity control method is based on the aforementioned structure, calculates an average value of the VCOM voltage as the standard VCOM voltage corresponding to the electronic paper display module, thereby improving the voltage consistency of a single electronic paper display module, and further improving the display uniformity of the electronic paper display module. At the same time, the VCOM uniformity control method of this application can more accurately determine the standard VCOM voltage of the electronic paper display module, reduce the difference between the electronic paper display modules of different pieces, and improve the uniformity of the electronic paper display modules of the same batch.

[0042] In this embodiment, the common electrode 3 is evenly divided into a nine-grid block, and a voltage sensor 5 for detecting the VCOM voltage is respectively arranged in each grid block. The voltage sensor 5 is arranged at the center position of each grid block. Of course, the block division of the common electrode 3 can be other numbers of blocks, such as a six-grid block, a twelve-grid block, etc. Considering cost and detection effectiveness, etc., this embodiment preferably divides it into a nine-grid block, which neither increases the cost by dividing it into more blocks nor reduces the detection accuracy due to too few divisions.

[0043] In order to ensure that the impedance from each grid block to the bottom driving IC module 4 is equal, so as to ensure that the consistency of the feedback VCOM voltage value is more accurate, in this embodiment, the impedances of the respective wires 6 connecting the voltage sensors 5 to the driving IC module 4 are set to be equal.

[0044] The above embodiments are only for explaining the technical concept and features of the present invention, and their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for controlling the VCOM uniformity of an electronic paper display module, characterized in that, The common electrode (3) is evenly divided into multiple grid blocks, and a voltage inductor (5) is respectively arranged in each grid block. The driving IC module (4) of the electronic paper display module leads out multiple wires (6), and each wire (6) is respectively connected to a voltage inductor (5). The impedances of the respective wires (6) connecting the respective voltage inductors (5) to the driving IC module (4) are equal. The VCOM uniformity control method includes the following processing steps: Turn on the electronic paper display module. Each voltage inductor (5) respectively reads the VCOM voltage value of the voltage inductor (5) in each grid block and feeds it back to the driving IC module (4), and when turning on the electronic paper display module to detect and feedback the VCOM voltage value of each block, all pixel points in the display area (2) are turned on; The driving IC module (4) obtains the average value of all the feedback VCOM voltage values as the final VCOM voltage value; Burn the final VCOM voltage value into the driving IC, and then turn off the electronic paper display module.

2. The method for controlling the VCOM uniformity of the electronic paper display module according to claim 1, characterized in that, The driving IC module (4) calculates the difference between every two VCOM voltage values according to the collected VCOM voltage values. If the difference is greater than the threshold, it is determined that the corresponding electronic paper display module is a defective product. Among them, the threshold is 0.15 - 0.25V.

3. The method for controlling the VCOM uniformity of the electronic paper display module according to claim 1, wherein, The common electrode (3) is evenly divided into a six-grid block or a nine-grid block, and a voltage inductor (5) for detecting the VCOM voltage is respectively arranged in each grid block.

4. The method for controlling the VCOM uniformity of the electronic paper display module according to claim 3, wherein The voltage inductor (5) is arranged at the center position of each grid block.

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