Electronic paper panel and high voltage driving method

Abstract

The present invention provides an electronic paper panel and a high-voltage driving method, which relates to the field of display technology, and includes: a glass substrate and a plurality of pixel units arranged on the glass substrate; each of the pixel units is provided with a first pixel capacitor, a second pixel capacitor and a parasitic capacitor; and each of the pixel units further includes an active layer, a pixel electrode layer and a semiconductor layer; the active layer and the pixel electrode layer are respectively arranged on a part of the surface of the glass substrate, and the pixel electrode layer is connected to the drain of the semiconductor layer through the first pixel capacitor; the drain of the semiconductor layer is in direct contact with the second electrode of the second pixel capacitor through the parasitic capacitor, and the first electrode of the second pixel capacitor is connected to the pixel electrode. The method can maintain the full-color display of the electronic paper ink screen while shortening the screen display time.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an electronic paper panel and a high-voltage driving method. 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 application markets in price tags, educational tablets, and bus stop signs. With the large-scale production and application of e-paper modules, the application of full-color display of e-paper is the future trend. In order to achieve full-color display and fast-swipe application, a higher panel drive voltage is required to achieve it. To achieve a higher panel drive voltage, it is a major challenge to the existing driver IC and panel TFT design. Summary of the invention

[0003] The problem solved by the present invention is how to maintain the full-color display of the electronic paper ink screen while shortening the screen refresh display time.

[0004] In order to solve the above problems, the present invention provides an electronic paper panel, comprising:

[0005] A glass substrate and a plurality of pixel units arranged on the glass substrate;

[0006] Each of the pixel units is provided with a first pixel capacitor, a second pixel capacitor and a parasitic capacitor; and each of the pixel units further includes an active layer, a pixel electrode layer and a semiconductor layer;

[0007] The active layer and the pixel electrode layer are respectively arranged on a partial surface of the glass substrate, and the pixel electrode layer is connected to the drain of the semiconductor layer through the first pixel capacitor; the drain of the semiconductor layer is directly in contact with the second electrode of the second pixel capacitor through the parasitic capacitor, and the first electrode of the second pixel capacitor is connected to the pixel electrode; through the high-voltage driving timing, the pre-charging signal of the second pixel capacitor and the boost charging signal of the first pixel capacitor are turned on in sequence, and when the polarities of the two sets of signals are the same, the high-voltage driving is completed.

[0008] In the above structure, each pixel unit is provided with a first pixel capacitor and a second pixel capacitor of two vertically stacked structures. The second pixel capacitor is closed and in a floating state after pre-charging. After the first pixel capacitor is boosted and charged, the voltage of the second pixel capacitor is raised, and the voltage of the pixel electrode can be raised at the same time, thereby achieving a high-voltage driving effect.

[0009] Furthermore, the second electrode of the parasitic capacitor is arranged in a different layer from the active layer, and is arranged in the same layer as the source electrode of the semiconductor layer and the drain electrode of the semiconductor layer.

[0010] Furthermore, an electronic paper film is connected to the pixel electrode.

[0011] Furthermore, an interlayer insulating layer is provided between the source electrode of the semiconductor layer and the drain electrode of the semiconductor layer.

[0012] Furthermore, the second pixel capacitor is a pre-charge capacitor, and the first pixel capacitor is a boost charging capacitor.

[0013] A high voltage driving method for an electronic paper panel comprises the steps of:

[0014] S1: a first pixel capacitor and a second pixel capacitor of a vertical stacking structure are provided in each pixel unit;

[0015] S2: pre-charge the second pixel capacitor and then turn it off and put it in a floating state;

[0016] S3: boost charging the first pixel capacitor, increase the voltage of the second pixel capacitor, and complete high-voltage driving.

[0017] Furthermore, the step S3 comprises:

[0018] S31: After each frame ends, the residual charges of the first pixel capacitor and the second pixel capacitor are released first, and then charging of the next frame is started.

[0019] The present invention adopts the above technical solution to achieve the following beneficial effects:

[0020] The present invention adds a first pixel capacitor, a second pixel capacitor and a parasitic capacitor to the film layer structure of the electronic paper panel, and the first pixel capacitor, the second pixel capacitor and the parasitic capacitor overlap each other in the vertical direction of the film layer structure, and then combines the driving signal timing to increase the electronic paper driving voltage from 15V to 30V, thereby achieving full-color display while also shortening the screen refresh time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of an electronic paper panel provided in Embodiment 1 of the present invention;

[0022] Figure 2 A schematic diagram of the architecture of an electronic paper panel provided in Embodiment 1 of the present invention;

[0023] Figure 3 A schematic diagram of a driving screen of an electronic paper panel provided in the first embodiment of the present invention;

[0024] Figure 4 A conventional front and rear frame driving timing diagram of the electronic paper panel provided in the first embodiment of the present invention;

[0025] Figure 5A timing diagram of residual charge removal driving of an electronic paper panel provided in the first embodiment of the present invention;

[0026] Figure 6 A driving timing diagram for removing residual charges in the electronic paper panel provided in the first embodiment of the present invention in the 1 / 2 working area;

[0027] Figure 7 The electronic paper panel and high voltage driving method provided by the second embodiment of the present invention Figure 1 ;

[0028] Figure 8 The electronic paper panel and high voltage driving method provided by the second embodiment of the present invention Figure 2 ;

[0029] Wherein: Cst1-first pixel capacitor, Cst2-second pixel capacitor. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] Embodiment 1

[0033] This embodiment provides an electronic paper panel, such as Figure 1 As shown, including:

[0034] A glass substrate and a plurality of pixel units arranged on the glass substrate;

[0035] Each pixel unit is provided with a first pixel capacitor Cst1, a second pixel capacitor Cst2 and a parasitic capacitor; and each pixel unit further includes an active layer, a pixel electrode layer and a semiconductor layer;

[0036] The active layer and the pixel electrode layer are respectively arranged on part of the surface of the glass substrate, and the pixel electrode layer is connected to the drain of the semiconductor layer through the first pixel capacitor Cst1; the drain of the semiconductor layer is directly in contact with the second electrode of the second pixel capacitor Cst2 through the parasitic capacitance, and the first electrode of the second pixel capacitor Cst2 is connected to the pixel electrode; through the high-voltage driving timing, the pre-charge signal of the second pixel capacitor Cst2 and the boost charging signal of the first pixel capacitor Cst1 are turned on in sequence, and when the polarities of the two sets of signals are the same, the high-voltage driving is completed.

[0037] Specifically, each pixel unit is provided with a first pixel capacitor Cst1 and a second pixel capacitor Cst2 having two vertically stacked structures. The second pixel capacitor Cst2 is closed and in a floating state after being pre-charged. After the first pixel capacitor Cst1 is boosted and charged, the voltage of the second pixel capacitor Cst2 is raised, thereby raising the voltage of the pixel electrode to ±30V, thereby achieving a high-voltage driving effect.

[0038] Specifically, the parasitic capacitance will cause the voltage to be boosted to ±30V only in the first frame, but the boost effect cannot be achieved in the second frame and beyond. Therefore, after each frame, the residual charge of the first pixel capacitor Cst1 and the second pixel capacitor Cst2 is released first, and then charging is started for the next frame. Figure 2 As shown, G1 to G4 represent gate signal lines, D1 to D12 represent data signal lines, and FPC represents a flexible circuit board, so as to achieve the following Figure 3 The screen shown is an example of the driving sequence. Figure 4 , there will be a blanking area in the two frames before and after the conventional driving sequence, which is usually set to GND signal. Figure 5 The driving timing for removing the residual charge is turned on once with the gate signal in the blanking area, and the data and com signals are both set to GND, so that the residual charge in the first pixel capacitor Cst1 and the second pixel capacitor Cst2 is completely released, thereby avoiding the residual charge of the previous frame in the parasitic capacitor, and thus each frame can achieve a high-voltage driving effect.

[0039] The second electrode of the parasitic capacitor is arranged in a different layer from the active layer, and is arranged in the same layer as the source electrode of the semiconductor layer and the drain electrode of the semiconductor layer. An electronic paper film is connected to the pixel electrode. An interlayer insulating layer is arranged between the source electrode of the semiconductor layer and the drain electrode of the semiconductor layer. The second pixel capacitor Cst2 is a pre-charge capacitor, and the first pixel capacitor Cst1 is a boost charging capacitor.

[0040] Specifically, there are at least two groups of pixel capacitors in the pixel unit, and they overlap each other in the vertical direction on the film structure; at least one group of pixel capacitors is a pre-charge capacitor, and another group of pixel capacitors is a boost charge capacitor. In terms of driving timing, the pre-charged data signal is turned on before the pre-boosted data signal. When the two groups of data signals have the same polarity (positive or negative), high-voltage driving can be achieved. The two groups of data signals can be different, and they can be combined to achieve driving within the range of +30 to -30V.

[0041] Specifically, after each frame ends, the residual charge of the pixel capacitor needs to be released. The charge release method is to turn on all gate signals in the blanking area at least once before the start of the second frame, and set the data and com signals to GND. The time when all gate signals for charge release are turned on can also drive the working area. For example, if it is turned on once, it is inserted once at 1 / 2 of all rows; if it is turned on twice, it is inserted at 1 / 3 of all rows. The method for removing residual charge can be not only in the blanking area, but also in the working area, such as at the 1 / 2 position, see Figure 6 shown.

[0042] The present invention adds a first pixel capacitor, a second pixel capacitor and a parasitic capacitor to the film layer structure of the electronic paper panel, and the first pixel capacitor, the second pixel capacitor and the parasitic capacitor overlap each other in the vertical direction of the film layer structure. Combined with the driving signal timing, the electronic paper driving voltage is increased from 15V to 30V, thereby achieving full-color display while also shortening the screen refresh time.

[0043] Embodiment 2

[0044] This embodiment provides an electronic paper panel and a high voltage driving method. Figure 7 and Figure 8 As shown, the method comprises the steps of:

[0045] S1: a first pixel capacitor and a second pixel capacitor of a vertical stacking structure are provided in each pixel unit;

[0046] S2: pre-charge the second pixel capacitor and then turn it off and put it in a floating state;

[0047] S3: boost charging the first pixel capacitor, increase the voltage of the second pixel capacitor, and complete high-voltage driving.

[0048] See also Figure 8 , wherein step S3 comprises:

[0049] S31: After each frame ends, the residual charges of the first pixel capacitor and the second pixel capacitor are released first, and then charging of the next frame is started.

[0050] The method increases the driving voltage of the electronic paper from 15V to 30V by adding a first pixel capacitor and a second pixel capacitor to the film structure of the electronic paper panel and combining the driving signal timing. Specifically, the second pixel capacitor is closed and in a floating state after pre-charging, and the first pixel capacitor raises the voltage of the second pixel capacitor after boost charging, and can raise the voltage of the pixel electrode to 30V, thereby achieving full-color display while also shortening the screen refresh time.

[0051] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A high voltage driving method for an electronic paper panel, the electronic paper panel comprising: A glass substrate and a plurality of pixel units arranged on the glass substrate; Each of the pixel units is provided with a first pixel capacitor (Cst1), a second pixel capacitor (Cst2) and a parasitic capacitor; and each of the pixel units further includes an active layer, a pixel electrode layer and a semiconductor layer; The active layer and the pixel electrode layer are respectively arranged on a part of the surface of the glass substrate, the pixel electrode layer is connected to the drain of the semiconductor layer through the first pixel capacitor (Cst1); the drain of the semiconductor layer is directly in contact with the second electrode of the second pixel capacitor (Cst2) through the parasitic capacitor, and the first electrode of the second pixel capacitor (Cst2) is connected to the pixel electrode; Through the high-voltage driving timing, the signal for precharging the second pixel capacitor (Cst2) and the signal for boosting and charging the first pixel capacitor (Cst1) are turned on in sequence, and when the polarities of the two sets of signals are the same, the high-voltage driving is completed; The second electrode of the parasitic capacitor is arranged in a different layer from the active layer, and is arranged in the same layer as the source electrode of the semiconductor layer and the drain electrode of the semiconductor layer; The pixel electrode is connected with an electronic paper film; An interlayer insulating layer is provided between the source electrode of the semiconductor layer and the drain electrode of the semiconductor layer; The second pixel capacitor (Cst2) is a pre-charge capacitor, and the first pixel capacitor (Cst1) is a boost charging capacitor; Characterized in that the high voltage driving method comprises the steps of: S1: a first pixel capacitor and a second pixel capacitor of a vertical stacking structure are provided in each pixel unit; S2: pre-charge the second pixel capacitor and then turn it off and put it in a floating state; S3: boost charging the first pixel capacitor, increase the voltage of the second pixel capacitor, and complete high-voltage driving; S31: After each frame ends, the residual charges of the first pixel capacitor and the second pixel capacitor are released first, and then charging of the next frame is started.

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