Flow-gradient variable color electronic paper

Abstract

The application discloses a flow gradual change color-changing electronic paper, comprising 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 a back surface of the display screen; the first voltage source is used for outputting a first driving voltage changing with time from a 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 a second driving voltage changing with time from a right side of the display screen to the upper common electrode layer and the lower common electrode layer in each period; wherein, the first driving voltage and the second driving voltage have the same change rule, and the voltage sizes are the same but the voltage directions are opposite at any moment in the same period. Therefore, the color-changing electronic paper disclosed by the application can present a flow gradual change color-changing effect, and can meet the needs of more use scenarios.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic paper, and particularly relates to a flow gradual change color electronic paper. BACKGROUND

[0002] Electronic paper ink screen display has the characteristics of ultra-low power consumption, low frequency display and power saving, and has a wide application market in price tags, education tablets and bus stop boards. At present, dot matrix screens and segment screens are used in the market. The dot matrix screen controls the opening or closing of a unit pixel TFT device through the voltage change of the scanning line and the data line to realize dot matrix picture display. The segment screen directly connects each segment unit to the FPC through a conductive circuit to realize simple picture and digital display.

[0003] The color-changing electronic paper module screen is a new branch of the application of the segment screen, can display the same color on the whole screen, has the characteristics of fast refreshing and rich color display, and has important application potential in color-changing ceramic tiles, digital electronic product housings, automobiles and clothing. SUMMARY

[0004] The embodiment of the present application provides a flow gradual change color electronic paper, which can present the effect of gradual flow color change and meet the needs of more use scenarios.

[0005] An embodiment of the present application provides a flow gradual change color 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 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 in color.

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

[0007] The first voltage source is configured to output a first driving voltage varying 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 configured to output a second driving voltage varying 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 variation law, and the voltage values are the same but the voltage directions are opposite at any time in the same cycle.

[0009] Further, the variation law comprises linear variation, cosine variation, or sine variation.

[0010] Further, the flow gradient variable color electronic paper as described in the above embodiment further comprises 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 at the upper side of the display screen respectively, and the second voltage source is connected to the upper common electrode layer and the lower common electrode layer at the right side of the display screen respectively.

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

[0014] Further, the third voltage source is further configured 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 configured to output a first driving voltage from the lower side of the display screen to the upper common electrode layer and the lower common electrode layer.

[0016] Further, the first voltage source and the second voltage source are further configured to output a rated voltage or stop outputting voltage.

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

[0019] Further, the first voltage source, the second voltage source, the third voltage source, and the fourth voltage source are further configured to output a third driving voltage varying with time and being the same to the upper common electrode layer and the lower common electrode layer.

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

[0021] By implementing the present application, the following beneficial effects are achieved:

[0022] The application discloses flow-gradual color-changing electronic paper, comprising 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 a back surface of the display screen; when the first voltage source outputs a first driving voltage varying with time to the upper common electrode layer and the lower common electrode layer from a left side of the display screen in each cycle, and the second voltage source outputs a second driving voltage varying with time to the upper common electrode layer and the lower common electrode layer from a right side of the display screen in each cycle, a potential difference formed by the first driving voltage and the second driving voltage exists between the display interface and the back surface of the display screen due to the same change rule of the first driving voltage and the second driving voltage and the same voltage size and opposite directions at any moment in a cycle, and different potential differences exist in the left-right direction of the display screen due to the time-varying first driving voltage and second driving voltage in a cycle, so that the distribution of the first capsule particles and the second capsule particles in the left-right direction of the display screen is different, and the display interface presents a gradual display effect in the left-right direction under the action of ambient light reflection, and the distribution of the first capsule particles and the second capsule particles presents periodic dynamic changes with the periodic changes of the first driving voltage and the second driving voltage, so that the gradual display effect of the display interface can also dynamically change, and a flow state is presented. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of flow-gradual color-changing electronic paper provided by an embodiment of the application.

[0024] Figure 2 is a change trend diagram of driving voltage in a cycle provided by an embodiment of the application.

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

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

[0027] Figure 5 is a potential difference schematic diagram of the display screen at a moment provided by an embodiment of the application.

[0028] Figure 6 is a schematic diagram of PWM pulse width modulation for realizing voltage change provided by an embodiment of the application.

[0029] Figure 7 is a structural schematic diagram of a display screen with a hollowed-out area provided by an embodiment of the present application

[0030] Figure 8 is a top view of a color-changing electronic paper provided with four voltage sources. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[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 “a plurality of” is two or more, unless otherwise explicitly and specifically limited.

[0034] Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can 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, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character “ / ” herein generally represents an “or” relationship between the associated objects before and after it.

[0036] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled 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] Referring to Figure 1 , a structural schematic diagram of a flow-gradually-changing color-changing electronic paper provided by an embodiment of the present application, comprising: a display screen 1, a first voltage source 2, a second voltage source 3, an upper common electrode layer 4 located at a 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 a plurality of second capsule particles 12 carrying negative charges, and the first capsule particles 11 and the second capsule particles 12 are different colors;

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

[0040] The first voltage source 2 is configured to output a first driving voltage varying 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 predetermined period.

[0041] The second voltage source 3 is configured to output a second driving voltage varying 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 period; wherein the first driving voltage and the second driving voltage have the same variation law, and the voltage size is the same but the voltage direction is opposite at any time in the same period.

[0042] Preferably, the variation law comprises linear variation, cosine variation, or sine variation.

[0043] In a preferred embodiment of the present invention, the first capsule particle 11 and the second capsule particle 12 are black and white, respectively. Then, assuming that within one period t, the first driving voltage and the second driving voltage change linearly, and the variation law of the first driving voltage from t0 to t4 is as follows... Figure 2 As shown in Figure a, the variation of the second driving voltage from t0 to t4 is as follows: Figure 2 As shown in Figure b, the positive and negative signs indicate the voltage direction. Therefore, within one period t, the display effect of display screen 1 is as follows: Figure 3 As shown, the dynamic display effect, which transitions from pure black to a gradual black-and-white gradient and then to pure white, is called a flowing screen display.

[0044] Taking time t2 as an example, such as Figure 4 As shown, the distribution of black and white capsule particles in the vertical cross-section of display screen 1 shows that the concentration of black particles gradually decreases and the concentration of white particles gradually increases from left to right. Under the influence of ambient light reflection, this results in a gradient display effect from left to right. Simultaneously, the vertical electric field intensity and direction of the capsule particles within the six segments 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. This distribution of different electric fields in different regions is achieved through the combined action of the first voltage source 2 and the second voltage source 3.

[0045] It should be noted that voltage changes over time can be achieved using PWM pulse width modulation, such as... Figure 6 As shown, for example Figure 6 In this context, t represents a period. The principle of achieving a linear voltage change curve using PWM voltage modulation within one period is as follows: For example, divide t into 10 equal parts, each with a time interval of t / 10. In each time interval, apply 10 pulses, each with a pulse width of t / 100 and a pulse voltage of 15V. Therefore, applying 10 pulses within a t / 10 time interval results in an average voltage of 15 * 10 * (t / 100) / (t / 10) = 15V. Similarly, applying 9 pulses within a 2t / 10 time interval results in an average voltage of 15 * 9 * (t / 100) / (t / 10) = 13.5V, and so on. To achieve different voltages within each time interval, simply control the number of pulses. The method for generating linear and cosine voltages is the same. Therefore, it can be understood that by adjusting the duration of the period T, the speed of the color-changing electronic paper's flow can be adjusted; by adjusting the pattern of change, the flow effect of the color-changing electronic paper can be adjusted.

[0046] It should be further noted that the present invention does not limit the shape of the display screen 1, and it can be a circle, a square, a trapezoid or other irregular shape. Based on the same principle, no matter what shape the display screen 1 is, it can present a gradient flow display effect.

[0047] Preferably, as shown in Figure 8 The flow gradient color-changing electronic paper described in the above embodiments further comprises 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 edge of the display screen 1, and the second voltage source 3 is connected to the upper common electrode layer 4 and the lower common electrode layer 5 at the right edge of the display screen 1.

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

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

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

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

[0053] In a preferred embodiment of the present application, as shown in Figure 8 By arranging the third voltage source 6 and the fourth voltage source 7 at the upper and lower edges of the display screen 1 respectively and making the adjacent two voltage sources output the same driving voltage, the display screen 1 can present a diagonal flow gradient effect.

[0054] Preferably, the first voltage source 2 and the second voltage source 3 are further configured to output a rated voltage or stop outputting voltage.

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

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

[0057] In a preferred embodiment of the present application, when the first voltage source 2 and the second voltage source 3 in the left-right direction output rated voltage or stop outputting voltage, the third voltage source 6 is controlled to output a first driving voltage from the upper edge 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 a second driving voltage from the lower edge 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 flowing from top to bottom.

[0058] Preferably, the first voltage source 2, the second voltage source 3, the third voltage source 6, and the fourth voltage source 7 are further configured to output a third driving voltage that changes over time and is identical to the upper common electrode layer 4 and the lower common electrode layer 5.

[0059] In a preferred embodiment of the present application, based on the same principle, when the voltage sources in four directions output a third driving voltage that changes over time and is identical 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 flowing display effect of gathering to the center or spreading to 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 application, as shown in Figure 7 The display screen 1 can also be provided with a plurality of hollow areas without the first capsule particles or the second capsule particles for embedding text, images, etc., so as to present a dynamic change effect when the display screen 1 presents a flowing effect, and the color-changing electronic paper disclosed in the present application can be better applied in the field of advertising, etc.

[0062] The above is a preferred embodiment of the present application, and it should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A color-changing electronic paper with a flowing gradient, characterized in that, include: The display screen comprises a first voltage source, a second voltage source, an upper common electrode layer located on the display interface of the display screen, and a lower common electrode layer located on 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 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 time-varying first driving voltage from the left side of the display screen to the upper common electrode layer and the lower common electrode layer in each preset cycle. The second voltage source is used to output a time-varying second driving voltage 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 variation law, and the voltage magnitude is the same but the voltage direction is opposite at any moment in the same cycle.

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

3. The color-changing electronic paper with a flowing gradient as described in claim 2, characterized in that, Also includes: The third voltage source and the fourth voltage source; The third voltage source is connected to the upper common electrode layer and the lower common electrode layer on the top of the display screen, respectively. The fourth voltage source is connected to the upper common electrode layer and the lower common electrode layer at the bottom of the display screen, respectively. The third voltage source is used to output a first driving voltage from the top 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 described in claim 3, characterized in that, The third voltage source is also used to output a second driving voltage from the top of the display screen to the upper common electrode layer and the lower common electrode layer; The fourth voltage source is also 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 described in claim 4, characterized in that, The first voltage source and the second voltage source are also used to output a rated voltage or to stop outputting voltage; The third voltage source is also used to output a first driving voltage from the top of the display screen to the upper common electrode layer and the lower common electrode layer; The fourth voltage source is also 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 described in claim 5, characterized in that, 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 exactly 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 described in claim 1, characterized in that, The display screen has several hollow areas that do not contain the first capsule particles or the second capsule particles.

Images