A waveform debugging method for improving white brightness of four-color electronic paper

Abstract

The application provides a waveform debugging method for improving white brightness of four-color electronic paper, and relates to the technical field of electronic paper display, and comprises the following steps: when waveform debugging is performed, a negative voltage of white charged particles and a positive voltage of yellow charged particles are first given to a display area, the negative voltage of the white charged particles is kept for a set time, and then a negative voltage pulse of the white charged particles is given. In the debugging of the display part, the push-pull structure of the positive voltage of the yellow charged particles and the negative voltage of the white charged particles is adopted before the negative voltage of the white charged particles. Since the volumes of the yellow charged particles and the white charged particles are different, the movement of the white charged particles lags behind that of the yellow charged particles. By using the push-pull vibration mode, the white charged particles are gradually moved to the upper part, and the yellow charged particles are gradually moved to the lower part, so that the purpose of separating the white charged particles and the yellow charged particles is achieved, and the problem of yellowish white is solved.

Description

Technical Field

[0001] This invention belongs to the field of electronic paper display technology, and particularly relates to a waveform adjustment method for enhancing the white brightness of four-color electronic paper. Background Technology

[0002] Electronic paper, as the name suggests, is a screen that resembles paper. Since current electronic paper uses electronic ink to achieve imaging, the "electronic paper" we commonly see is also called an electronic ink screen. In principle, an electronic ink screen consists of two substrates coated with electronic ink composed of countless tiny transparent particles. These particles are formed within sealed liquid microcapsules, creating positively charged black particles, red particles, and negatively charged white and yellow particles. These four colored charged particles move in different directions depending on the electric field, thus displaying black, red, yellow, and white effects on the screen surface. Waveform adjustment is necessary to ensure good display effects for electronic paper products. The quality of each batch of newly produced electronic paper will vary slightly, and the manufacturing process will also have slight differences. Therefore, we need to modify the waveform to correct these differences and ensure that each batch of products achieves the same display effect. Some electronic paper modules may exhibit a yellowish tint after being left to stand for a long time. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a waveform adjustment method for improving the white brightness of four-color electronic paper, which effectively solves the problem of the white color turning yellowish after the electronic paper module has been left to stand for a long time.

[0004] To achieve the above-mentioned objective, this invention provides a waveform adjustment method for enhancing white brightness in four-color electronic paper, comprising the following steps: Step 1: In the voltage balancing region, apply a voltage with the opposite polarity to the charged particles to neutralize the voltage; Step 2: Apply voltages of opposite polarities to the charged particles four times in the vibration zone: the first time, the step size of both the positive and negative voltages is N2; the second time, the step size of the positive voltage is N3 and the step size of the negative voltage is N4, and N3 < N4; the third time, the step size of both the positive and negative voltages is N5; the fourth time, the step size of the positive voltage is N6 and the step size of the negative voltage is N7, and N6 < N7. Step 3: Apply negative voltage to the white charged particles and positive voltage to the yellow charged particles in two separate stages in the display area, and then apply negative voltage to the white particles after a period of time.

[0005] Preferably, in step two, after applying voltages of opposite polarities to the charged particles four times, a fifth voltage application process is included: applying a positive voltage to the charged particles with a step size of N8.

[0006] Preferably, in the first step, the process of applying voltage in the voltage balancing area is cycled 1 time; in the second step, the process of applying voltage for the first time in the vibration area is cycled 44 times, the process of applying voltage for the second time is cycled 20 times, the process of applying voltage for the third time is cycled 23 times, the process of applying voltage for the fourth time is cycled 10 times, and the process of applying voltage for the fifth time is cycled 10 times; in the third step, the process of applying voltage in the first stage is cycled 3 times, the process of applying voltage in the second stage is cycled 10 times, and the process of applying voltage to the white particles is cycled 1 time.

[0007] Preferably, in the third step, in the first stage, when a negative voltage is applied to the white charged particles and a positive voltage is applied to the yellow charged particles, the step size of the negative voltage of the white particles is N9, and the step size of the positive voltage of the yellow particles is N10, and N10 < N9; in the second stage, when a negative voltage is applied to the white charged particles and a positive voltage is applied to the yellow charged particles, the step size of the negative voltage of the white particles is N11, and the step size of the positive voltage of the yellow particles is N12, and N12 < N11; at the same time, it also satisfies N12 < N10 and N9 > N11.

[0008] Preferably, in the two stages of the third step, the absolute value of the amplitude of the negative voltage of the white particles is greater than the absolute value of the amplitude of the positive voltage of the yellow charged particles.

[0009] Preferably, in the third step, after a period of time, the step size of applying a negative voltage to the white particles is N14, and the step size of the pulse gap is N13, and N13 < N14.

[0010] Preferably, in the first step, the second step and the third step, the voltage waveforms applied to the charged particles are all square waves.

[0011] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides a strong versatility, which can effectively improve the white optical display effect and solve the problem that the white color turns yellow after the four-color electronic paper stands still for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the driving voltage timing diagram of the present invention; Figure 2 It is the electronic paper display state diagram after the debugging method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments.

[0014] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0015] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0016] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] like Figure 1 As shown, the waveform adjustment method for enhancing white brightness in four-color electronic paper according to the present invention includes the following steps: Step 1: Reference Figure 1 In the first part, a voltage with opposite polarity to its own voltage is applied to the charged particles in the voltage balancing region to neutralize the voltage. The step size N1 of this voltage is determined by the absolute value of the difference between the positive and negative charges in the display area.

[0018] Step Two: Reference Figure 1 Parts ②, ③, ④, ⑤, and ⑥ involve applying voltages of opposite polarity and equal amplitude to the charged particles in the vibration zone to ensure uniform distribution of the particles and eliminate afterimages. Specifically, the vibration zone applies voltages of opposite polarity and equal amplitude to the charged particles twice, with the first step size being N2. Figure 1In the second part, the second step size is N5, that is Figure 1 In the fourth part, N2 = N5. In addition, the vibration distinguishes the voltages with opposite polarities and different amplitudes for the positive and negative charged particles. The first step sizes are N3 and N4 respectively, and N3 < N4, that is Figure 1 In the third part. The second step sizes are N6 and N7 respectively, and N6 < N7, that is Figure 1 In the fifth part. The sixth part applies a positive voltage to the charged particles, and the step size is N8.

[0019] Step 3: Apply a negative voltage to the white charged particles and a positive voltage to the yellow charged particles in two stages in the display area. After a period of time, apply a negative voltage to the white particles again. Refer to Figure 1 In the seventh, eighth, and ninth parts, apply a negative voltage to the white charged particles and a positive voltage to the yellow charged particles in two stages in the display area. After a period of time, apply a negative voltage to the white particles again. Specifically, in the first stage of the display area, when applying a negative voltage to the white charged particles and a positive voltage to the yellow charged particles, the step size of the negative voltage of the white particles is N9, the step size of the positive voltage of the yellow particles is N10, and N10 < N9, and the absolute value of the amplitude of the negative voltage of the white particles is greater than the absolute value of the amplitude of the positive voltage of the yellow charged particles, that is Figure 1 In the seventh part. In the second stage of the display area, when applying a negative voltage to the white charged particles and a positive voltage to the yellow charged particles, the step size of the negative voltage of the white particles is N11, the step size of the positive voltage of the yellow particles is N12, and N12 < N11, and the absolute value of the amplitude of the negative voltage of the white particles is greater than the absolute value of the amplitude of the positive voltage of the yellow charged particles, that is Figure 1 In the eighth part, N12 < N10 and N9 > N11. When applying a negative voltage to the white particles in the display area, the step size of the negative voltage of the white particles is N14, and the step size of the pulse gap is N13, and N13 < N14, that is Figure 1 In the ninth part.

[0020] In this embodiment, in Step 1, Step 2, and Step 3, the voltages applied to the charged particles are all square waves. The first part cycles once, the second part cycles 44 times, the third part cycles 20 times, the fourth part cycles 23 times, the fifth part cycles 10 times, the sixth part cycles 10 times, the seventh part cycles 3 times, the eighth part cycles 10 times, the ninth part cycles once, and the absolute value of the negatively charged particles is equal to the absolute value of the positively charged particles.

[0021] Next, use two waveforms before and after improvement to test the white optical values (L value, a value, b value) of the same color e-paper module at room temperature Data before modification is as follows: Data after modification is as follows: Figure 2 This is a diagram showing the state of the electronic paper display after the debugging method of the present invention.

[0022] The debugging principle of this invention is as follows: The phenomenon of a white electronic paper module turning yellowish after prolonged static placement indicates that in addition to white particles, a small amount of yellow particles are also present at the top. Therefore, the white appears slightly yellowish. This yellowish tint is related to the manufacturing process. In this case, if a structure with a negative voltage for the white particles is used, the yellow particles will move to the top of the module first, making the white appear yellowish.

[0023] Considering that the presence of yellow particles mixed with white particles can result in a yellowish tint to the white display, this application provides a push-pull structure in the display section that uses a positive voltage for yellow particles and a negative voltage for white particles before the negative voltage for white particles. Because yellow and white particles have different volumes, the movement of white particles lags behind that of yellow particles. This push-pull method allows white particles to gradually move upwards and yellow particles to gradually move downwards, thus separating the white and yellow particles and solving the problem of a yellowish tint to the white display.

[0024] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A waveform adjustment method for enhancing white brightness in four-color electronic paper, characterized in that, It includes the following steps: Step 1: In the voltage balancing region, match a voltage with the opposite polarity to the self-voltage of the charged particles to neutralize the voltage; Step 2: Apply voltages with opposite polarities to the charged particles four times in the vibration region: The step sizes of the positive and negative polarity voltages applied for the first time are both N2; the step size of the positive polarity voltage applied for the second time is N3, and the step size of the negative polarity voltage is N4, and N3 < N4; the step sizes of the positive and negative polarity voltages applied for the third time are both N5; the step size of the positive polarity voltage applied for the fourth time is N6, and the step size of the negative polarity voltage is N7, and N6 < N7; Step 3: Apply a negative voltage to the white charged particles and a positive voltage to the yellow charged particles in two stages in the display region. After a period of time, apply a negative voltage to the white particles again.

2. The waveform adjustment method for enhancing white brightness in four-color electronic paper according to claim 1, characterized in that, In Step 2 described above, after applying voltages with opposite polarities to the charged particles four times, it further includes a process of applying a voltage for the fifth time: Apply a positive polarity voltage to the charged particles, and the step size is N8.

3. The waveform adjustment method for enhancing white brightness in four-color electronic paper according to claim 1, characterized in that, In Step 1 described above, the process of applying voltage in the voltage balancing region is cycled 1 time; In Step 2 described above, the process of applying voltage for the first time in the vibration region is cycled 44 times, the process of applying voltage for the second time is cycled 20 times, the process of applying voltage for the third time is cycled 23 times, the process of applying voltage for the fourth time is cycled 10 times, and the process of applying voltage for the fifth time is cycled 10 times; in Step 3 described above, the process of applying voltage in the first stage is cycled 3 times, the process of applying voltage in the second stage is cycled 10 times, and the process of applying voltage to the white particles again is cycled 1 time.

4. The waveform adjustment method for enhancing white brightness in four-color electronic paper according to claim 1, characterized in that, In Step 3 described above, when applying a negative voltage to the white charged particles and a positive voltage to the yellow charged particles in the first stage, the step size of the negative voltage of the white particles is N9, and the step size of the positive voltage of the yellow particles is N10, and N10 < N9; when applying a negative voltage to the white charged particles and a positive voltage to the yellow charged particles in the second stage, the step size of the negative voltage of the white particles is N11, and the step size of the positive voltage of the yellow particles is N12, and N12 < N11; at the same time, it also satisfies N12 < N10 and N9 > N11.

5. The waveform adjustment method for enhancing white brightness in four-color electronic paper according to claim 1, characterized in that, In the two stages of Step 3 described above, the absolute value of the amplitude of the negative voltage of the white particles is greater than the absolute value of the amplitude of the positive voltage of the yellow charged particles.

6. The waveform adjustment method for enhancing white brightness in four-color electronic paper according to claim 1, characterized in that, In Step 3 described above, the step size of applying a negative voltage to the white particles again after a period of time is N14, and the step size of the pulse interval is N13, and N13 < N14.

7. The waveform adjustment method for enhancing white brightness in four-color electronic paper according to claim 1, characterized in that, In Step 1, Step 2 and Step 3 described above, the voltage waveforms applied to the charged particles are all square waves.

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