Flow gradient color-changing electronic paper

Abstract

The invention discloses flow gradient color-changing electronic paper which comprises a display screen, a first voltage source, a second voltage source, an upper common electrode layer located on a display interface of the display screen and a lower common electrode layer located on the back face of the display screen. The first voltage source is used for outputting first driving voltage changing along with time from the left side of the display screen to the upper common electrode layer and the lower common electrode layer in each preset period; the second voltage source is used for outputting second driving voltage changing along with time to the upper common electrode layer and the lower common electrode layer from the right side of the display screen in each period; wherein the change rules of the first driving voltage and the second driving voltage are the same, and the voltages at any moment in the same period are the same in magnitude but opposite in voltage direction. Therefore, the color-changing electronic paper disclosed by the invention can present a flowing gradually-changing color-changing effect, and can meet the requirements of more use scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic paper, and in particular to a flowing and gradually changing color electronic paper. Background Art

[0002] E-paper ink screen display has the characteristics of ultra-low power consumption, low-frequency display, and power saving. It has a wide range of applications in price tags, educational tablets, and bus stop signs. Currently, the e-paper display forms on the market include dot matrix screens and segment code screens. The dot matrix screen controls the opening or closing of the unit pixel TFT device through the voltage changes of the scan line and data line to achieve dot matrix screen display; while the segment code screen connects each segment unit directly to the FPC through a conductive line to achieve simple screen and digital display;

[0003] Color-changing electronic paper module screen is a new branch of segment code screen application. It can display the same color on the whole screen, has fast refresh and rich color display features, and has important application potential in color-changing tiles, digital electronic product shells, automobiles, clothing, etc. However, the shortcoming of the current color-changing electronic paper is that the change of a single color on the whole screen is very monotonous, which is difficult to meet many usage scenarios. Summary of the invention

[0004] The embodiment of the present invention provides a flowing and gradually changing color electronic paper, which can present a gradually changing and flowing color changing effect and meet the needs of more usage scenarios.

[0005] An embodiment of the present invention provides a flow-gradient color-changing electronic paper, comprising: a display screen, a first voltage source, a second voltage source, an upper common electrode layer located at a display interface of the display screen, and a lower common electrode layer located at the back of the display screen; wherein a plurality of first capsule particles carrying positive charges and second capsule particles carrying negative charges are arranged in the display screen, and the first capsule particles and the second capsule particles are different colors;

[0006] The first voltage source is connected to the upper common electrode layer and the lower common electrode layer on the left side of the display screen respectively; the second voltage source is connected to the upper common electrode layer and the lower common electrode layer on the right side of the display screen respectively;

[0007] The first voltage source is used to output a first driving voltage that varies with time from the left side of the display screen to the upper common electrode layer and the lower common electrode layer in each preset period;

[0008] The second voltage source is used to output a second driving voltage that changes with time from the right side of the display screen to the upper common electrode layer and the lower common electrode layer in each cycle; wherein the first driving voltage and the second driving voltage have the same changing pattern, and at any time in the same cycle, the voltages are the same in magnitude but opposite in direction.

[0009] Furthermore, the change rule includes: linear change, cosine change, or sine change.

[0010] Furthermore, the flowing gradient color-changing electronic paper as described in the above embodiment further includes: a third voltage source and a fourth voltage source;

[0011] The third voltage source is connected to the upper common electrode layer and the lower common electrode layer respectively on the upper side of the display screen; the second voltage source is connected to the upper common electrode layer and the lower common electrode layer respectively on the right side of the display screen;

[0012] The third voltage source is used to output a first driving voltage from the upper side of the display screen to the upper common electrode layer and the lower common electrode layer;

[0013] The fourth voltage source is used to output a second driving voltage from the bottom of the display screen to the upper common electrode layer and the lower common electrode layer.

[0014] Furthermore, the third voltage source is also used to output a second driving voltage from the upper side of the display screen to the upper common electrode layer and the lower common electrode layer;

[0015] The fourth voltage source is further used to output a first driving voltage from the bottom of the display screen to the upper common electrode layer and the lower common electrode layer.

[0016] Furthermore, the first voltage source and the second voltage source are also used to output a rated voltage, or stop outputting a voltage;

[0017] The third voltage source is further used to output a first driving voltage from the upper side of the display screen to the upper common electrode layer and the lower common electrode layer;

[0018] The fourth voltage source is further used to output a second driving voltage from the bottom of the display screen to the upper common electrode layer and the lower common electrode layer.

[0019] Furthermore, the first voltage source, the second voltage source, the third voltage source, and the fourth voltage source are also used to output a third driving voltage that varies with time and is completely the same to the upper common electrode layer and the lower common electrode layer.

[0020] Furthermore, the display screen is provided with a plurality of hollow areas without the first capsule particles or the second capsule particles.

[0021] The following beneficial effects are achieved by implementing the present invention:

[0022] The present invention discloses a color-changing electronic paper with a flowing gradient, comprising: a display screen, a first voltage source, a second voltage source, an upper common electrode layer located at a display interface of the display screen, and a lower common electrode layer located at the back of the display screen; when the first voltage source outputs a first driving voltage that changes with time from the left side of the display screen to the upper common electrode layer and the lower common electrode layer in each cycle, and the second voltage source outputs a second driving voltage that changes with time from the right side of the display screen to the upper common electrode layer and the lower common electrode layer in each cycle, since in one cycle, the first driving voltage and the second driving voltage have the same changing rule and the voltages are the same in magnitude but opposite in direction at any time, the display interface of the display screen is smooth and smooth. There is a potential difference between the back sides constructed by the first driving voltage and the second driving voltage, and because the first driving voltage and the second driving voltage change with time within a cycle, there are different potential differences in the left and right directions of the display screen, so that the distribution of the first capsule particles and the second capsule particles in the left and right directions of the display screen is different, and under the effect of ambient light reflection, the display interface presents a gradient display effect in the left and right directions, and with the periodic changes of the first driving voltage and the second driving voltage, the distribution of the first capsule particles and the second capsule particles will also show periodic dynamic changes, and the gradient effect of the display interface can also change dynamically, thereby presenting a flowing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a flowing gradient color-changing electronic paper provided by an embodiment of the present invention.

[0024] Figure 2 This is a diagram showing a change trend of a driving voltage within a cycle provided by an embodiment of the present invention.

[0025] Figure 3 The display effect of the display screen at each moment in a cycle provided by an embodiment of the present invention is

[0026] Figure 4 This is a distribution diagram of capsule particles of a display screen provided by an embodiment of the present invention at a certain moment.

[0027] Figure 5 Schematic diagram of the potential difference of a display screen at a certain moment provided by an embodiment of the present invention

[0028] Figure 6 Schematic diagram of voltage change achieved by PWM pulse width modulation provided by an embodiment of the present invention

[0029] Figure 7 Schematic diagram of the structure of a display screen with a hollow area provided by an embodiment of the present invention

[0030] Figure 8 1 is a top view of a color-changing electronic paper provided with four voltage sources according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] See also Figure 1 , is a schematic structural diagram of a flow-gradient color-changing electronic paper provided by an embodiment of the present invention, comprising: a display screen 1, a first voltage source 2, a second voltage source 3, an upper common electrode layer 4 located at the display interface of the display screen 1, and a lower common electrode layer 5 located at the back of the display screen 1; wherein the display screen 1 is provided with a plurality of first capsule particles 11 carrying positive charges and second capsule particles 12 carrying negative charges, and the first capsule particles 11 and the second capsule particles 12 are of different colors;

[0039] The first voltage source 2 is connected to the upper common electrode layer 4 and the lower common electrode layer 5 on the left side of the display screen 1; the second voltage source 3 is connected to the upper common electrode layer 4 and the lower common electrode layer 5 on the right side of the display screen 1;

[0040] The first voltage source 2 is used to output a first driving voltage that varies with time from the left side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5 in each preset period;

[0041] The second voltage source 3 is used to output a second driving voltage that changes with time from the right side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5 in each cycle; wherein the first driving voltage and the second driving voltage have the same changing pattern, and at any time in the same cycle, the voltages are the same in magnitude but opposite in direction.

[0042] Preferably, the change rule includes: linear change, cosine change, or sine change.

[0043] In a preferred embodiment of the present invention, the first capsule particles 11 and the second capsule particles 12 are black and white respectively. Then, in a period t, the first driving voltage and the second driving voltage change linearly, and the change rule of the first driving voltage during t0-t4 is as follows: Figure 2 As shown in Figure a, the variation rule of the second driving voltage during t0-t4 is as follows Figure 2 As shown in Figure b, the positive and negative in the figure represent the direction of voltage. Then in a cycle t, the display effect of display screen 1 is as follows Figure 3 As shown, the dynamic display effect from all black, gradually changing from black to white, to all white is a flowing screen display.

[0044] Take time t2 as an example, Figure 4 As shown in FIG. 1 , the distribution of black and white capsule particles in the vertical cross section of the display screen 1 shows that the concentration of black particles on the display interface gradually decreases from left to right, while the concentration of white particles gradually increases. Under the effect of ambient light reflection, a gradient display effect is presented from left to right. At the same time, the vertical electric field strength and electric field direction of the capsule particles in the 6 sections of the gradient display effect from left to right are as follows: Figure 5 As shown, the area above the X-axis represents a positive electric field, and the area below the X-axis represents a negative electric field. The distribution of different electric fields in different areas is achieved by the combined action of the first voltage source 2 and the second voltage source 3.

[0045] It should be noted that the voltage variation over time can be achieved through PWM pulse width modulation, such as Figure 6 As shown, for example Figure 6 In the figure, t represents a cycle. The principle of using PWM voltage modulation to achieve a linear voltage change curve in a cycle is: for example, first divide t into 10 equal parts, each part is t / 10, and 10 pulses are made in each part. Each pulse width is t / 100, and the pulse width voltage is 15V. Therefore, 10 pulses are made in the t / 10 time period, and the average voltage is 15*10*(t / 100) / (t / 10)=15V. Similarly, 9 pulses are made in the 2t / 10 time period, and the average voltage is 15*9*(t / 100) / (t / 10)=13.5V. By analogy, if you want to achieve different voltages in each time period, you only need to control the number of pulses. The method of generating linear and sine and cosine voltages is the same. It can be understood that by adjusting the duration of the cycle T, the speed of the color-changing electronic paper can be adjusted, and by adjusting the change rule, the flow effect of the color-changing electronic paper can be adjusted.

[0046] It should be further explained that the present invention does not limit the shape of the display screen 1, which may be circular, square, trapezoidal or other irregular shapes. Based on the same principle, no matter what shape the display screen 1 is, it can present a gradual flow display effect.

[0047] Preferably, Figure 8 As shown, the flowing gradient color-changing electronic paper described in the above embodiment further includes: a third voltage source 6 and a fourth voltage source 7;

[0048] The third voltage source 6 is connected to the upper common electrode layer 4 and the lower common electrode layer 5 at the upper side of the display screen 1; the second voltage source 3 is connected to the upper common electrode layer 4 and the lower common electrode layer 5 at the right side of the display screen 1;

[0049] The third voltage source 6 is used to output a first driving voltage from the upper side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5;

[0050] The fourth voltage source 7 is used to output a second driving voltage from the bottom of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5 .

[0051] Preferably, the third voltage source 6 is further used to output a second driving voltage from the upper side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5;

[0052] The fourth voltage source 7 is further used to output a first driving voltage from the bottom of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5 .

[0053] In a preferred embodiment of the present invention, the same Figure 8 As shown, by arranging a third voltage source 6 and a fourth voltage source 7 above and below the display screen 1 respectively, and making the two adjacent voltage sources output the same driving voltage, the display screen 1 can present a gradual flow effect in the diagonal direction.

[0054] Preferably, the first voltage source 2 and the second voltage source 3 are also used to output a rated voltage, or stop outputting a voltage;

[0055] The third voltage source 6 is further used to output a first driving voltage from the upper side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5;

[0056] The fourth voltage source 7 is further used to output a second driving voltage from the bottom of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5 .

[0057] In a preferred embodiment of the present invention, when the first voltage source 2 and the second voltage source 3 in the left and right directions output the rated voltage, or stop outputting the voltage, the third voltage source 6 is controlled to output the first driving voltage from the upper side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5, and the fourth voltage source 7 is controlled to output the second driving voltage from the lower side of the display screen 1 to the upper common electrode layer 4 and the lower common electrode layer 5. Based on the above principle, the color-changing electronic paper can present a dynamic effect of gradual flow up and down.

[0058] Preferably, the first voltage source 2, the second voltage source 3, the third voltage source 6, and the fourth voltage source 7 are also used to output a third driving voltage that varies with time and is completely the same to the upper common electrode layer 4 and the lower common electrode layer 5.

[0059] In a preferred embodiment of the present invention, based on the same principle, when voltage sources in four directions output a third driving voltage that changes with time and is exactly the same to the upper common electrode layer 4 and the lower common electrode layer 5 from four directions, the color-changing electronic paper can present a flow display effect that gathers toward the center or diffuses toward the outside.

[0060] Preferably, the display screen 1 is provided with a plurality of hollow areas without the first capsule particles or the second capsule particles.

[0061] In a preferred embodiment of the present invention, Figure 7 As shown, the display screen 1 can also be provided with a number of hollow areas without the first capsule particles or the second capsule particles for embedding text, images, etc., so that when the display screen 1 presents a flow effect, a background dynamic change effect is presented. In addition, the color-changing electronic paper disclosed in the present invention can be better applied to fields such as advertising.

[0062] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A color-changing electronic paper with a flowing gradient, characterized in that: include: A display screen, a first voltage source, a second voltage source, an upper common electrode layer located at a display interface of the display screen, and a lower common electrode layer located at the back of the display screen; wherein the display screen is provided with a plurality of first capsule particles carrying positive charges and second capsule particles carrying negative charges, and the first capsule particles and the second capsule particles are of different colors; The first voltage source is connected to the upper common electrode layer and the lower common electrode layer on the left side of the display screen respectively; the second voltage source is connected to the upper common electrode layer and the lower common electrode layer on the right side of the display screen respectively; The first voltage source is used to output a first driving voltage that varies with time from the left side of the display screen to the upper common electrode layer and the lower common electrode layer in each preset period; The second voltage source is used to output a second driving voltage that changes with time from the right side of the display screen to the upper common electrode layer and the lower common electrode layer in each cycle; wherein the first driving voltage and the second driving voltage have the same changing pattern, and at any time in the same cycle, the voltages are the same in magnitude but opposite in direction.

2. The color-changing electronic paper with a flowing gradient as claimed in claim 1, characterized in that: The change rule includes: linear change, cosine change, or sine change.

3. The color-changing electronic paper with a flowing gradient as claimed in claim 2, characterized in that: Also includes: a third voltage source and a fourth voltage source; The third voltage source is connected to the upper common electrode layer and the lower common electrode layer respectively on the upper side of the display screen; The second voltage source is respectively connected to the upper common electrode layer and the lower common electrode layer on the right side of the display screen; The third voltage source is used to output a first driving voltage from the upper side of the display screen to the upper common electrode layer and the lower common electrode layer; The fourth voltage source is used to output a second driving voltage from the bottom of the display screen to the upper common electrode layer and the lower common electrode layer.

4. The color-changing electronic paper with a flowing gradient as claimed in claim 3, characterized in that: The third voltage source is further used to output a second driving voltage from the upper side of the display screen to the upper common electrode layer and the lower common electrode layer; The fourth voltage source is further used to output a first driving voltage from the bottom of the display screen to the upper common electrode layer and the lower common electrode layer.

5. The color-changing electronic paper with a flowing gradient as claimed in claim 4, characterized in that: The first voltage source and the second voltage source are further used to output a rated voltage, or stop outputting a voltage; The third voltage source is further used to output a first driving voltage from the upper side of the display screen to the upper common electrode layer and the lower common electrode layer; The fourth voltage source is further used to output a second driving voltage from the bottom of the display screen to the upper common electrode layer and the lower common electrode layer.

6. The color-changing electronic paper with a flowing gradient as claimed in claim 5, characterized in that: The first voltage source, the second voltage source, the third voltage source, and the fourth voltage source are further used to output a third driving voltage that varies with time and is completely the same to the upper common electrode layer and the lower common electrode layer.

7. The color-changing electronic paper with a flowing gradient as claimed in claim 1, characterized in that: The display screen is provided with a plurality of hollow areas without the first capsule particles or the second capsule particles.

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