Electronic paper display device and driving method thereof

Abstract

The present invention relates to the field of display technology. The present invention discloses an electronic paper display device and a driving method thereof, comprising: a common-level electrode module, configured on the color film substrate side of the electronic paper module, including N independent electrode blocks forming the entire common-level electrode, each independent electrode block having an equal area or resistance value, wherein N ≥ 2; a current-sharing circuit module, for dynamically adjusting the charge and discharge currents of each independent electrode block according to a dynamic adjustment instruction, and controlling the difference in current of each branch within a preset fluctuation range; a drive control module, for receiving the balanced current signal output by the current-sharing circuit module, and sending a dynamic adjustment instruction to the current-sharing circuit module via a control signal line; and the drive control module is further configured to output charge and discharge pulses to each independent electrode block in a preset time-sharing sequence. The device and driving method of the present application reduce the difference in charge and discharge currents and improve the reliability of electronic paper in high-temperature environments.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an electronic paper display device and a driving method thereof. Background Art

[0002] Cholesteric liquid crystals are widely used in electronic paper displays due to their bistable properties. The active cholesteric LCD single-pixel drive architecture primarily consists of a gate line on the thin-film transistor substrate side, a source line, a thin-film transistor, a common line on the color filter substrate side, and a pixel unit. The pixel unit state is controlled by applying a voltage between the common electrode of the color filter substrate and the pixel electrode of the thin-film transistor substrate. The source line is used to send data to the drain of the thin-film transistor, while the gate line controls the gate of the thin-film transistor to turn the thin-film transistor on or off. The pixel unit is connected to the source of the thin-film transistor to receive and store data signals, forming an electric field with the common electrode to control the deflection of the liquid crystal.

[0003] In the existing drive scheme, such as Figure 1-Figure 3 As shown in Figure 1, the panel is charged and discharged by alternately applying a voltage sequence of + common voltage → 0 → - common voltage to control the switching of liquid crystal molecules between H state (vertical alignment state), P state (planar state) or FC state (focal conic state). However, as the panel size increases, the uneven distribution of AC common line resistance leads to significant differences in charge and discharge currents, as shown in Figure 1. Figure 4 As shown in the figure, this is a conventional AC common-level design. The AC common levels of all the traces on both sides are directly short-circuited together in the X PCB, which results in differences in the charge and discharge currents of each trace. Figure 5 and Figure 6 As shown, the edge trace current is as high as 5A, while the center trace current is less than 1A. This current imbalance can cause local overcurrent to burn out the binding pins, leading to a cascading failure. If one set of pins burns out, the current will transfer to another set of pins, ultimately causing the entire module to fail. Existing technologies have not effectively addressed the problem of multi-branch current imbalance under high-capacitance loads, severely limiting the reliability and service life of large-scale e-paper devices. Summary of the Invention

[0004] In order to solve the technical problems existing in the background technology, the present invention provides an electronic paper display device and a driving method thereof.

[0005] The present invention provides an electronic paper display device, comprising:

[0006] The common-level electrode module is configured on the color filter substrate side of the electronic paper module and includes N independent electrode blocks forming the entire common-level electrode. The area or resistance value of each independent electrode block is equal, where N ≥ 2;

[0007] The current-sharing circuit module is used to dynamically adjust the charge and discharge current of each independent electrode block according to the dynamic adjustment instruction, and control the current difference of each branch within the preset fluctuation range;

[0008] A drive control module is used to receive the balanced current signal output by the current balancing circuit module and send a dynamic adjustment instruction to the current balancing circuit module through a control signal line;

[0009] The drive control module is also used to output charge and discharge pulses to each independent electrode block in a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block.

[0010] Preferably, the current balancing circuit module includes N groups of current balancing units, the input end of each group of current balancing units is electrically connected to the corresponding independent electrode block of the common electrode cutting module through a first conductive trace, and the output end of each group of current balancing units is electrically connected to the current distribution port of the drive control module through a second conductive trace, wherein the N groups of current balancing units correspond one-to-one to N independent electrode blocks.

[0011] Preferably, the current balancing unit is specifically a series resistor or an active current balancing integrated circuit.

[0012] Preferably, the dynamic adjustment instruction is specifically a resistance adjustment instruction or a parameter control instruction of an active current sharing integrated circuit.

[0013] Preferably, the drive control module specifically includes:

[0014] The driving unit electrically connects the current distribution port of the driving unit to the output end of the current sharing circuit module through the second conductive trace;

[0015] The time-sharing driving logic unit is electrically connected to each independent electrode block of the common-level electrode cutting module through a third conductive trace.

[0016] Preferably, it also includes:

[0017] The routing layout module is integrated on the thin-film transistor substrate side of the electronic paper module and includes a symmetrically distributed AC common-level routing network. The AC common-level routing network is electrically connected to the power output end of the drive control module through a third conductive routing to provide charging and discharging voltage to the common-level electrode cutting module.

[0018] Preferably, the AC common-level wiring network and the source signal lines and gate signal lines of the electronic paper module are all insulated from each other.

[0019] Preferably, the preset time-sharing sequence is specifically that when a preset temperature range is reached, the independent electrode blocks at the edge are activated first.

[0020] Preferably, the preset time-sharing sequence is specifically to output charge and discharge pulses from the independent electrode block at the center to the independent electrode block at the edge in sequence, and the pulse intervals between adjacent independent electrode blocks are .

[0021] The present invention provides an electronic paper driving method, which is applied to any of the electronic paper display devices described above, and includes:

[0022] Cut the entire common-level electrode on the color filter substrate side of the electronic paper module into N independent electrode blocks;

[0023] A current-sharing circuit is configured for each independent electrode block, and the charge and discharge current of each branch is dynamically adjusted through series resistors or active current-sharing integrated circuits;

[0024] Receive the balanced current signal output by the current balancing circuit module, and send a dynamic adjustment instruction to the current balancing circuit module through the control signal line;

[0025] Outputting charge and discharge pulses to each independent electrode block in sequence according to a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block;

[0026] The branch current data corresponding to each independent electrode block is collected in real time, and the branch current data is fed back to the drive control module to dynamically correct the current sharing circuit parameters or preset the time-sharing sequence.

[0027] The electronic paper display device and its driving method proposed in the present invention divide the entire common-level electrode on the color filter substrate side of the electronic paper module into N independent electrode blocks; configure a current-sharing circuit for each independent electrode block, and dynamically adjust the charge and discharge current of each branch through a series resistor or an active current-sharing integrated circuit; receive the balanced current signal output by the current-sharing circuit module, and send a dynamic adjustment instruction to the current-sharing circuit module through a control signal line; output charge and discharge pulses to each independent electrode block in sequence according to a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block; collect branch current data corresponding to each independent electrode block in real time, and feed the branch current data back to the drive control module to dynamically modify the current-sharing circuit parameters or the preset time-sharing sequence. By dividing the common-level electrodes, dynamically adjusting the current through the current-sharing circuit, using a time-sharing drive strategy and a symmetrical wiring layout, the difference in charge and discharge current is reduced, thereby reducing the temperature of the binding pins and significantly improving the reliability of the electronic paper in high-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of a cholesteric electronic paper module;

[0029] Figure 2 Schematic diagram of substrate distribution of cholesteric electronic paper module;

[0030] Figure 3 Schematic diagram of the co-level distribution of the cholesteric electronic paper module;

[0031] Figure 4 Schematic diagram of AC common-stage charging and discharging of cholesteric electronic paper module;

[0032] Figure 5 It is a schematic diagram of the driving structure of the prior art;

[0033] Figure 6 for Figure 5 Schematic diagram of current overcharge of driving structure;

[0034] Figure 7 This is a schematic diagram of the implementation structure of an electronic paper display device proposed by the present invention being cut into six independent electrode blocks;

[0035] Figure 8 An electronic paper display device proposed by the present invention Figure 7 Schematic diagram of the equivalent circuit of six independent electrode blocks;

[0036] Figure 9 A schematic diagram of a driving architecture of an electronic paper display device proposed by the present invention;

[0037] Figure 10 This is a schematic diagram of the workflow of an electronic paper driving method proposed in the present invention. DETAILED DESCRIPTION

[0038] Reference Figure 7-Figure 9 , an electronic paper display device proposed in this embodiment includes:

[0039] The common-level electrode module is configured on the color filter substrate side of the electronic paper module and includes N independent electrode blocks that form the entire common-level electrode. The area or resistance value of each independent electrode block is equal, where N ≥ 2.

[0040] The current sharing circuit module is used to dynamically adjust the charge and discharge current of each independent electrode block according to the dynamic adjustment instruction, and control the current difference of each branch within a preset fluctuation range.

[0041] In this embodiment, the current-sharing circuit module includes N groups of current-sharing units. The input of each group of current-sharing units is electrically connected to the corresponding independent electrode block of the common-level electrode cutting module via a first conductive trace, and the output of each group of current-sharing units is electrically connected to the current distribution port of the drive control module via a second conductive trace. The N groups of current-sharing units correspond one to each of the N independent electrode blocks. The current-sharing circuit module dynamically adjusts the charge and discharge current of each independent electrode block through series resistors or an active current-sharing integrated circuit, controlling the current difference between each branch to within 10%, suppressing the risk of local overcurrent and thermal loss caused by uneven resistance distribution. It also collaborates with the drive control module to achieve balanced current distribution, ensuring stable operation and extended life of the electronic paper module in high-temperature environments.

[0042] Specifically, the current balancing unit is a series resistor or an active current balancing integrated circuit.

[0043] Specifically, the dynamic adjustment instruction is a resistance adjustment instruction or a parameter control instruction of an active current sharing integrated circuit.

[0044] The drive control module is used to receive the balanced current signal output by the current balancing circuit module and send a dynamic adjustment instruction to the current balancing circuit module through the control signal line.

[0045] The drive control module is also used to output charge and discharge pulses to each independent electrode block in a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block.

[0046] In this embodiment, the drive control module specifically includes: a drive unit, whose current distribution port is electrically connected to the output terminal of the current balancing circuit module via a second conductive trace; and a time-sharing drive logic unit, which is electrically connected to each independent electrode block of the common electrode cutting module via a third conductive trace. This ensures balanced current distribution, prevents local overcurrent, and maintains stable driving and long-life operation of the electronic paper module in high-temperature environments.

[0047] Specifically, when the electronic paper is driven normally, the preset time-sharing sequence is to output charge and discharge pulses from the independent electrode block in the center to the independent electrode block at the edge in sequence, and the pulse interval between adjacent independent electrode blocks is When the temperature of the corresponding position of the electronic paper display device reaches a preset temperature range, such as when the temperature is ≥80°C, the preset order is to prioritize activating the independent electrode blocks at the edge.

[0048] In this embodiment, it also includes:

[0049] The routing layout module is integrated on the thin-film transistor substrate side of the electronic paper module and includes a symmetrically distributed AC common-level routing network. The AC common-level routing network is electrically connected to the power output end of the drive control module through a third conductive routing to provide charging and discharging voltage to the common-level electrode cutting module.

[0050] In this embodiment, the AC common-level wiring network and the source signal lines and gate signal lines of the electronic paper module are all insulated from each other.

[0051] Example 1

[0052] The entire common-level electrode is cut into 6 independent electrode blocks P1-P6. The area of each independent electrode block is equal. The layout is as follows: Figure 7 As shown in the figure, assuming that the total area of the common electrode is S, the area of each independent electrode block is S / 6, and the cutting path spacing is divided proportionally according to the total size. During the drive control process, the drive control module outputs charge and discharge pulses in the order of P1→P4→P2→P5→P3→P6, with an interval of 15 , preventing instantaneous current concentration. After adjustment, the current per channel can be limited to approximately 2.9A, while ensuring the total discharge current is close to normal charge and discharge speeds. Since the current output of all channels is essentially the same after adjustment, the port is less likely to burn out, ensuring reliable normal flow.

[0053] Taking the existing medium-sized products (25 inches to 35 inches) with an AC common voltage of 30V as an example, Figure 3 The panel structure shown is equivalent to Figure 8 In the circuit model shown, the AC common voltage charges and discharges P1-P6 from the left and right sides. Due to the proximity of the charge and discharge paths for P1-P6, the 0.5Ω resistor between them is negligible, and the two paths in each branch are equivalent to parallel resistors. The equivalent parallel resistance of P1-P6 is 2.8Ω per pair. The intermediate series resistors are shown in the figure as follows: 2.3Ω, 32.2Ω, 100Ω, 32.1Ω, and 2.4Ω. The initial currents flowing through P1-P6 (assuming an AC common voltage of 30V) are calculated as: 10.89A, 6.06A, 1.02A, 1.01A, 5.95A, and 10.89A.

[0054] according to Figure 7The segmentation scheme shown divides the AC common-state into six equal-sized independent electrode blocks, as shown in the diagram. Because these blocks have equal areas, the equivalent capacitance C has the same value: C = εS / 4πkd, where C is capacitance, ε is dielectric constant, S is the area of the independent electrode block, π is pi, k is the electrostatic force constant, and d is the vertical distance. The applied voltage is the same, so the charge calculation formula Q = CV, where Q is charge, C is capacitance, and V is voltage. Calculations show that the color filter substrate-side electrode plates P1 through P6 have the same charge. Therefore, the inrush current in each block is 1 / 6 of the total inrush current before segmentation.

[0055] The total impact current before segmentation is calculated based on the charge current calculation formula, which is I=Q / t, where I is the total impact current before segmentation; Q is the total charge; and t is the unit time. Figure 8 As shown, each block corresponds to two discharge paths, and the discharge current corresponding to a single discharge path is 1 / 2 of the inrush current of each block.

[0056] To summarize, the value is ((10.89A + 6.06A + 1.02A + 1.01A + 5.95A + 10.89A) / 6) / 2 = 2.98A. Therefore, the single discharge path is approximately 2.98A. Through the calculation in this example, the high inrush current path can be reduced to a safe range without reducing the overall discharge rate.

[0057] Reference Figure 7-10 The present invention proposes an electronic paper driving method, which is applied to any of the above electronic paper display devices, and the method includes:

[0058] Cut the entire common-level electrode on the color filter substrate side of the electronic paper module into N independent electrode blocks;

[0059] A current-sharing circuit is configured for each independent electrode block, and the charge and discharge current of each branch is dynamically adjusted through series resistors or active current-sharing integrated circuits;

[0060] Receive the balanced current signal output by the current balancing circuit module, and send a dynamic adjustment instruction to the current balancing circuit module through the control signal line;

[0061] Outputting charge and discharge pulses to each independent electrode block in sequence according to a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block;

[0062] The branch current data corresponding to each independent electrode block is collected in real time, and the branch current data is fed back to the drive control module to dynamically correct the current sharing circuit parameters or preset the time-sharing sequence.

[0063] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An electronic paper display device, characterized in that: include: The common-level electrode module is configured on the color filter substrate side of the electronic paper module and includes N independent electrode blocks forming the entire common-level electrode. The area or resistance value of each independent electrode block is equal, where N ≥ 2; The current-sharing circuit module is used to dynamically adjust the charge and discharge current of each independent electrode block according to the dynamic adjustment instruction, and control the current difference of each branch within the preset fluctuation range; A drive control module is used to receive the balanced current signal output by the current balancing circuit module and send a dynamic adjustment instruction to the current balancing circuit module through a control signal line; The drive control module is also used to output charge and discharge pulses to each independent electrode block in a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block.

2. The electronic paper display device according to claim 1, wherein: The current balancing circuit module includes N groups of current balancing units, the input end of each group of current balancing units is electrically connected to the corresponding independent electrode block of the common electrode cutting module through a first conductive trace, and the output end of each group of current balancing units is electrically connected to the current distribution port of the drive control module through a second conductive trace, wherein the N groups of current balancing units correspond one-to-one to N independent electrode blocks.

3. The electronic paper display device according to claim 2, wherein: The current balancing unit is specifically a series resistor or an active current balancing integrated circuit.

4. The electronic paper display device according to claim 3, wherein: The dynamic adjustment instruction is specifically a resistance adjustment instruction or a parameter control instruction of an active current sharing integrated circuit.

5. The electronic paper display device according to claim 1, wherein: The drive control module specifically includes: The driving unit electrically connects the current distribution port of the driving unit to the output end of the current sharing circuit module through the second conductive trace; The time-sharing driving logic unit is electrically connected to each independent electrode block of the common-level electrode cutting module through a third conductive trace.

6. The electronic paper display device according to claim 1, wherein: Also includes: The routing layout module is integrated on the thin-film transistor substrate side of the electronic paper module and includes a symmetrically distributed AC common-level routing network. The AC common-level routing network is electrically connected to the power output end of the drive control module through a third conductive routing to provide charging and discharging voltage to the common-level electrode cutting module.

7. The electronic paper display device according to claim 6, wherein: The AC common-level wiring network and the source signal lines and gate signal lines of the electronic paper module are all insulated from each other.

8. The electronic paper display device according to claim 1, wherein: The preset time-sharing sequence is specifically to give priority to activating the independent electrode blocks at the edge when the preset temperature range is reached.

9. The electronic paper display device according to claim 1, wherein: The preset time-sharing sequence is specifically to output charge and discharge pulses from the independent electrode block at the center to the independent electrode block at the edge, and the pulse interval between adjacent independent electrode blocks is .

10. An electronic paper driving method, characterized in that: Applied to the electronic paper display device according to any one of claims 1 to 9, the method comprises: Cut the entire common-level electrode on the color filter substrate side of the electronic paper module into N independent electrode blocks; A current-sharing circuit is configured for each independent electrode block, and the charge and discharge current of each branch is dynamically adjusted through series resistors or active current-sharing integrated circuits; Receive the balanced current signal output by the current balancing circuit module, and send a dynamic adjustment instruction to the current balancing circuit module through the control signal line; Outputting charge and discharge pulses to each independent electrode block in sequence according to a preset time-sharing sequence to reduce the instantaneous current peak and coordinate the voltage switching of each independent electrode block; The branch current data corresponding to each independent electrode block is collected in real time, and the branch current data is fed back to the drive control module to dynamically correct the current sharing circuit parameters or preset the time-sharing sequence.

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