A driving waveform debugging method for electronic paper

Abstract

The present invention discloses a driving waveform debugging method for electronic paper, comprising: arbitrarily selecting an EPD as an experimental product, each basic voltage in the driving waveform of the EPD is turned on by adopting the same line scanning rate, and recording the line scanning rate as V1; for the driving waveform of the EPD selected in step S1, a plurality of continuous basic voltages of the same magnitude in the driving waveform of the EPD is used as a debugging voltage, and calculating the line scanning rate V2 required to turn on each debugging voltage in the driving waveform; initializing T-CON hardware of the EPD of the same model; storing the line scanning rate V2 obtained in step S2 and the corresponding debugging voltage magnitude in an internal memory of an FPGA; outputting a driving waveform by the FPGA according to the line scanning rate V2 and the corresponding debugging voltage magnitude stored in the internal memory thereof, and sending the output driving waveform to an EPD electronic module at the same time, and displaying a picture by the EPD electronic module. The method is simple to operate and can greatly improve the superiority of electronic paper display.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic paper, and in particular to a driving waveform debugging method for electronic paper. Background Art

[0002] Electronic paper (EPD) is a display screen made using electrophoretic display technology. It displays images by outputting row scan signals through the gate of the driver IC to open the voltage of the driving waveform that is continuously applied to each pixel.

[0003] In EPD display, the display effect and grayscale are inseparable from the driving waveform. The driving waveform of electronic paper will be affected by the electrical characteristics of the TFT substrate (gate frequency, TFT charging rate, TFT holding voltage, source and gate impedance and capacitance), the batch of electronic paper film, the capacitance of electronic paper, the response speed of electronic paper, the driving mode of the driver IC, the driving voltage and current. In the case of a fixed display module, we usually change the effect of the displayed image by adjusting the driving waveform.

[0004] For daily electronic paper, the rate of its line scan signal is usually only 100k, and the frame length of a driving waveform of a reading membrane is at least 50 frames (this frame length is the frame length without pursuing display effect). Each frame length corresponds to a waveform segment. If it is assumed that the height of the gate (that is, the height of the screen resolution) is 1000, then the time required to complete a frame length of the driving waveform is calculated as follows: s = 1 / 100k / 1000, that is, it takes 10ms to complete a waveform segment. It can be seen that if the electronic paper adds one waveform segment, the frame length will produce a completion time of 10ms; and there is a line break interval of 1-2ms between the frame lengths corresponding to each waveform segment; currently, the frame length corresponding to a driving waveform is 50, so the time required to light up a picture is 0.5s, which is a long time, but relatively speaking, this time is already the shortest time. If the length of the jitter frame in the driving waveform needs to be increased for the sake of effect, then the time taken to light up a picture will be longer, which may reach the time consumed by the frame length of 128 to 150 frames. Such an electronic paper will take longer to display a frame of image. Therefore, in scenarios with high requirements for time and effect, it is particularly important to improve the efficiency of the driving waveform. For example: in the reading scenario, users have speed requirements in the process of reading.

[0005] If the frequency of the line scan signal is opened and the time required for each waveform segment is accurately adjusted, the adjustment of the drive waveform will be more precise, and the entire drive waveform will not need to be adjusted once the line scan signal frequency is adjusted. Only the line scan time of a single part needs to be adjusted. That is, the completion time of the drive waveform can be flexibly controlled, and it is also easier to adjust the drive waveform without moving the entire body due to the line scan time. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a driving waveform debugging method for electronic paper, which improves the driving waveform efficiency by flexibly controlling the line scanning signal rate, thereby improving the display rate of the electronic paper.

[0007] The technical solution adopted by the present invention is a method for debugging a driving waveform of an electronic paper, the method comprising the following steps:

[0008] S1. Randomly select an EPD as an experimental product. For the driving waveform of the display module used to drive the EPD, each basic voltage in the driving waveform is turned on with the same row scanning rate, and the row scanning rate is recorded as V1.

[0009] S2, for the driving waveform of the display module of the EPD selected in step S1, the continuous and same-size basic voltages in the driving waveform of the EPD are used as a debugging voltage to obtain a plurality of debugging voltages, and the row scanning rate V2 required to turn on each debugging voltage in the driving waveform is calculated, V2=V1 / n, where n represents the number of continuous and same-size basic voltages contained in one debugging voltage; the row scanning rates corresponding to each debugging voltage in the driving waveform are arranged in the order of the debugging voltages;

[0010] S3. Perform waveform debugging on the same type of EPD. The specific process is as follows:

[0011] S3.1. Initialize the T-CON hardware of the same model of EPD, wherein the T-CON hardware includes: FPGA, flash memory, DDR3 fast memory, serial port and display module;

[0012] S3.2, storing the row scan rate V2 and the corresponding debug voltage values ​​arranged in the order of the debug voltages obtained in step S2 into the internal memory of the FPGA;

[0013] S3.3, the FPGA outputs a driving waveform according to the row scanning rate V2 stored in its internal memory and the voltage value of the corresponding debugging voltage, and sends the output driving waveform to the display module, which displays the picture.

[0014] The beneficial effects of the present invention are: by adopting the above-mentioned driving waveform debugging method for electronic paper, a dynamic line scanning rate is used to output the driving waveform, thereby improving the output efficiency of the driving waveform, thereby improving the display rate of the electronic paper. This method replaces the method of outputting the driving waveform at a fixed line scanning rate in the original technology, is simple to operate, and can greatly improve the superiority of the electronic paper display.

[0015] Preferably, in step S3.1, the specific process of initializing the T-CON hardware of the EPD of the same model is:

[0016] S3.01. Before powering on the T-CON hardware, the FPGA program in the T-CON hardware is placed in the flash memory, the initial information of the display module is saved in the flash memory, and the image data to be displayed is also pre-stored in the flash memory; the initial information of the display module includes the size of the EPD, the debugging time of the driving waveform, the resolution of the EPD, and the type of the reading film;

[0017] S3.02, power on the T-CON hardware, the FPGA starts the on-chip initialization process, and completes the reading of the program in the flash memory. After the program is loaded, the program will read the initial information of the display module from the flash according to the program instructions;

[0018] S3.03, reset and charge the DDR3 fast memory in the T-CON hardware, and after the reset and charging are completed, read the image data to be displayed stored in the flash memory back to the DDR3 fast memory. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of a method for debugging a driving waveform of an electronic paper according to the present invention;

[0020] Figure 2 This is a driving waveform diagram obtained by using a fixed line scanning rate in the prior art;

[0021] Figure 3 The driving waveform diagram is obtained by a driving waveform debugging method for electronic paper of the present invention. DETAILED DESCRIPTION

[0022] The invention will be further described below with reference to the accompanying drawings and in combination with specific implementations, so that those skilled in the art can implement the invention with reference to the description. The protection scope of the invention is not limited to the specific implementations.

[0023] The present invention relates to a driving waveform debugging method for electronic paper, such as Figure 1 As shown, the method comprises the following steps:

[0024] S1. Randomly select an EPD as an experimental product. For the driving waveform of the display module used to drive the EPD, each basic voltage in the driving waveform is turned on with the same row scanning rate, and the row scanning rate is recorded as V1.

[0025] S2, for the driving waveform of the EPD selected in step S1, the continuous and same-size basic voltages in the driving waveform of the EPD are used as a debugging voltage to obtain a plurality of debugging voltages, and the row scanning rate V2 required to turn on each debugging voltage in the driving waveform is calculated, V2=V1 / n, where n represents the number of continuous and same-size basic voltages contained in one debugging voltage; the row scanning rate corresponding to each debugging voltage in the driving waveform is arranged in the order of the debugging voltages;

[0026] S3. Perform waveform debugging on the same type of EPD. The specific process is as follows:

[0027] S3.1. Initialize the T-CON hardware of the same model of EPD, wherein the T-CON hardware includes: FPGA, flash memory, DDR3 fast memory, serial port and display module;

[0028] S3.2, storing the row scan rate V2 and the corresponding debug voltage size arranged in the order of debug voltage obtained in step S2 into the internal memory of FPGA;

[0029] S3.3, the FPGA outputs a driving waveform according to the row scanning rate V2 stored in its internal memory and the corresponding debugging voltage, and sends the output driving waveform to the display module, which displays the picture.

[0030] The above-mentioned driving waveform debugging method for electronic paper adopts a dynamic line scanning rate to output the driving waveform, which improves the output efficiency of the driving waveform, thereby improving the display rate of the electronic paper. This method replaces the method of outputting the driving waveform at a fixed line scanning rate in the original technology. It is simple to operate and can greatly improve the superiority of the electronic paper display.

[0031] In step S3.1, the specific process of initializing the T-CON hardware of the same model of EPD is as follows:

[0032] S3.01. Before powering on the T-CON hardware, put the FPGA program in the T-CON hardware into the flash memory, save the initial information of the display module in the flash memory, and also pre-store the image data to be displayed in the flash memory; the initial information of the display module includes the size of the EPD, the debugging time of the driving waveform, the resolution of the EPD, and the type of the reading film; in the prior art, the EPD film includes a label film, a reading film, and a low-temperature film;

[0033] S3.02, power on the T-CON hardware, the FPGA starts the on-chip initialization process, and completes the reading of the program in the flash memory. After the program is loaded, the program will read the initial information of the display module from the flash according to the program instructions;

[0034] S3.03, reset and charge the DDR3 fast memory in the T-CON hardware, and after the reset and charging are completed, read the image data to be displayed stored in the flash memory back to the DDR3 fast memory.

[0035] The driving waveform is represented by mathematical symbols: 2222211111222221110000000000000002222200000000000001111111111, wherein the number 2 represents a +15v voltage, the number 1 represents a -15v voltage, and the number 0 represents a voltage of 0; wherein 22222 represents five basic voltages whose continuous voltage magnitudes are all +15v, and 11111 represents five basic voltages whose continuous voltage magnitudes are all -15v; Figure 2 The driving waveform of the original technology with the same line scanning rate V1 turned on is shown, V1 = 120k. Figure 3 It shows that the driving waveform is opened with a dynamic line scanning rate, and the dynamic line scanning rates corresponding to the driving waveform are: 24k, 24k, 24k, 40k, 9.5k, 24k, 12k, 9.5k and 13.3k.

Claims

1. A method for debugging a driving waveform of an electronic paper, characterized in that: The method comprises the following steps: S1. Randomly select an EPD as an experimental product. For the driving waveform of the display module used to drive the EPD, each basic voltage in the driving waveform is turned on with the same row scanning rate, and the row scanning rate is recorded as V1. S2, for the driving waveform of the display module of the EPD selected in step S1, the continuous and identical basic voltages in the driving waveform are used as a debugging voltage to obtain a plurality of debugging voltages, and the row scanning rate V2 required to turn on each debugging voltage in the driving waveform is calculated, V2=V1 / n, where n represents the number of continuous and identical basic voltages contained in one debugging voltage; the row scanning rates corresponding to each debugging voltage in the driving waveform are arranged in the order of the debugging voltages; S3. Perform waveform debugging on the same type of EPD. The specific process is as follows: S3.

1. Initialize the T-CON hardware of the same model of EPD, wherein the T-CON hardware includes: FPGA, flash memory, DDR3 fast memory, serial port and display module; S3.2, storing the row scan rate V2 and the corresponding debug voltage values ​​arranged in the order of the debug voltages obtained in step S2 into the internal memory of the FPGA; S3.3, the FPGA outputs a driving waveform according to the row scanning rate V2 stored in its internal memory and the voltage value of the corresponding debugging voltage, and sends the output driving waveform to the display module, which displays the picture.

2. The driving waveform debugging method of electronic paper according to claim 1, characterized in that: In step S3.1, the specific process of initializing the T-CON hardware of the same model of EPD is as follows: S3.

01. Before powering on the T-CON hardware, the FPGA program in the T-CON hardware is placed in the flash memory, the initial information of the display module is saved in the flash memory, and the image data to be displayed is also pre-stored in the flash memory; the initial information of the display module includes the size of the EPD, the debugging time of the driving waveform, the resolution of the EPD, and the type of the reading film; S3.02, power on the T-CON hardware, the FPGA starts the on-chip initialization process, and completes the reading of the program in the flash memory. After the program is loaded, the program will read the initial information of the display module from the flash according to the program instructions; S3.03, reset and charge the DDR3 fast memory in the T-CON hardware, and after the reset and charging are completed, read the image data to be displayed stored in the flash memory back to the DDR3 fast memory.

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