Multistable display device with local update mode

Abstract

This invention discloses a multistable display device with a local update mode. The multistable display device completes the local image update without affecting the color difference of the other pixels in the same column by outputting a pixel electrode sustaining signal and a line electrode sustaining signal to a pixel electrode and a line electrode corresponding to a non-updating pixel. This further overcomes the problem of brightness and color difference that multistable display devices are prone to when updating local images.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a multistable display device with a local update mode. Prior Technology

[0002] A conventional multistable display, such as a cholesterol liquid crystal display (ChLCD), exhibits bistable liquid crystal display characteristics. Therefore, this multistable display requires multiple voltage configurations to drive it when displaying images. Please refer to Figure 16, which is a schematic diagram of the panel structure of a conventional cholesterol liquid crystal display. The cholesterol liquid crystal display has a display panel unit 30a, which is a passive matrix composed of multiple intersecting pixel electrodes 31a (rows 1 to M) and multiple line electrodes 32a (columns 1 to N). The intersection of each pixel electrode 31a and each line electrode 32a forms a pixel. That is, each pixel has a corresponding pixel electrode 31a and a corresponding line electrode 32a. In Figure 16, the display panel unit 30a has M pixel electrodes 31a and N line electrodes 32a. Generally, the driving method of the display panel unit 30a involves the driver chip outputting line electrode driving signals to multiple line electrodes 32a. For example, the driving circuit unit 20a, which is electrically coupled to the display panel unit 30a, outputs pixel electrode driving signals and line electrode driving signals to multiple pixel electrodes 31a and line electrodes 32a in a scanning manner.

[0003] Cholesterol liquid crystals exhibit bistable properties, meaning they exist in two stable states: a planar state and a focal-conic state. In the planar state, the liquid crystals are neatly aligned and reflect light of a specific wavelength; this is typically called the bright state. In the focal-conic state, the liquid crystals are randomly aligned and scatter incident light; this is typically called the dark state. Traditionally, when updating a portion of the image, it is done column-by-column. This involves the driving circuit unit 20a outputting line electrode drive signals row by row to the line electrode 32a corresponding to the pixel requiring update. Simultaneously, for each column of the pixel requiring update, a pixel electrode drive signal is output to the corresponding pixel electrode 31a, thereby performing the column-by-column update.

[0004] Please refer to Figure 17 again. For ease of explanation, the pixel electrodes 31a and line electrodes 32a in the display panel unit 30a in Figure 16 are simply divided into nine-grid blocks. Each block in the nine-grid can be regarded as a pixel or as a block composed of multiple pixels. Blocks A, B, C, D, E, F, and G, H, I are regarded as line electrodes 32a in the same column, and blocks A, D, G, B, E, H, C, F, I are regarded as pixel electrodes 31a in the same row. Taking the line electrodes 32a of blocks D, E, and F as examples, when updating a local screen, it is done by scanning column by column. For example, in the entire 3x3 grid image, since blocks D and F are located in the same line electrode 32a as block E, when block E is updated, blocks D and F will also be affected, thus changing the color difference of blocks D and F. This further causes color difference between block D and the blocks above and below A and G, as well as color difference between block F and the blocks above and below C and I.

[0005] Therefore, how to provide a multi-stable display device without color difference problems has become an urgent research topic. Summary of the Invention

[0006] This invention discloses a multistable display device with a partial update mode, comprising a timing control circuit unit, a display panel unit, and a driving circuit unit. The timing control circuit unit generates a timing control signal. The display panel unit has a plurality of pixel electrodes and a plurality of line electrodes. Each pixel electrode and each line electrode intersects at a certain position to form a pixel, and the pixel includes at least one pixel to be updated and at least one non-updated pixel. The driving circuit unit is connected to the timing control circuit unit and the display panel unit to receive the timing control signal and generate a plurality of pixel electrode driving signals to the pixel electrodes of the display panel unit, and to generate a plurality of line electrode driving signals to the line electrodes of the display panel unit.

[0007] The timing control signals include a portion of update control signals, multiple data signals, and multiple scan signals. The data signals include multiple pixel electrode waveform data, each corresponding to a specific pixel electrode. The scan signals include multiple line electrode waveform data, each corresponding to a specific line electrode. The update control signals include at least one update control signal and at least one non-update control signal. The update control signal corresponds to the pixel electrode waveform data and line electrode waveform data of the pixel electrode corresponding to the pixel to be updated, and the non-update control signal corresponds to the pixel electrode waveform data and line electrode waveform data of the pixel electrode corresponding to the non-update pixel. The pixel electrode driving signals include at least one pixel electrode update signal and at least one pixel electrode sustaining signal, and the line electrode driving signals include at least one line electrode update signal and at least one line electrode sustaining signal.

[0008] The driving circuit unit outputs the pixel electrode update signal and the line electrode update signal to the pixel electrode and the line electrode corresponding to the pixel to be updated, and outputs the pixel electrode hold signal and the line electrode hold signal to the pixel electrode and the line electrode corresponding to the non-updated pixel. The voltage difference generated by the pixel electrode update signal and the line electrode update signal on the pixel to be updated is greater than or equal to a pixel voltage transition value.

[0009] As described above, the multistable display device of the present invention completes the update of a partial image without affecting the color difference of the other pixels in the same column by outputting the pixel electrode sustaining signal and the line electrode sustaining signal to the pixel electrode and the line electrode corresponding to the non-updating pixel, thereby further overcoming the problem of brightness and color difference that multistable display devices are prone to produce when updating a partial image. Simple Explanation of the Diagram

[0010] Figure 1 is a block diagram of the first embodiment of the multi-stable display device of the present invention. Figure 2 is a schematic diagram of the panel structure of the multi-stable display device of the present invention. Figures 3A to 3C are schematic diagrams of some update control signals, pixel electrode waveform data, and line electrode waveform data of the multi-stable display device of the present invention. Figures 4A to 4C are schematic diagrams of the header setting signal, pixel electrode waveform data, and line electrode waveform data of the multi-stable display device of the present invention. Figure 5 is a block diagram of a second embodiment of the multi-stable display device of the present invention. Figures 6A to 6C are schematic diagrams of the header setting signal, data section update control signal, and pixel electrode waveform data of the multi-stable display device of the present invention. Figures 7A and 7B are schematic diagrams of pixel electrode waveform data and pixel electrode driving signals of the multi-stable display device of the present invention. Figures 8A to 8C are schematic diagrams of the header setting signal, the scanning part update control signal, and the line electrode waveform data of the multi-stable display device of the present invention. Figures 9A and 9B are schematic diagrams of the line electrode waveform data and line electrode drive signals of the multi-stable display device of the present invention. Figures 10A to 10C are schematic diagrams of the header setting signal, data section update control signal, and pixel electrode waveform data of the multi-stable display device of the present invention. Figures 11A and 11B show the pixel electrode waveform data and pixel electrode driving signals of the multi-stable display device of the present invention. Figures 12A to 12C are schematic diagrams of the header setting signal, the scanning part update control signal, and the line electrode waveform data of the multi-stable display device of the present invention. Figures 13A and 13B show the line electrode waveform data and line electrode drive signals of the multi-stable display device of the present invention. Figures 14A to 14C are schematic diagrams of pixel electrode waveform data, pixel electrode driving signals, and digital-to-analog conversion signals of the multi-stable display device of the present invention. Figures 15A to 15C are schematic diagrams of the line electrode waveform data, line electrode drive signals, and digital-to-analog conversion signals of the multi-stable display device of the present invention. Figure 16 is a schematic diagram of the structure of a conventional cholesterol liquid crystal display panel. Figure 17 is a schematic diagram of a conventional cholesterol liquid crystal display panel with a nine-grid layout. Implementation

[0011] Please refer to Figures 1 and 2. The present invention relates to a multistable display device with a partial update mode. The multistable display device includes a timing control circuit unit 10, a driving circuit unit 20, and a display panel unit 30. The timing control circuit unit 10 generates a timing control signal. The display panel unit 30 has a plurality of pixel electrodes 31 and a plurality of line electrodes 32. A pixel is formed at the intersection of each pixel electrode 31 and each line electrode 32, and the pixel includes at least one pixel to be updated and at least one non-updated pixel. The driving circuit unit 20 is connected to the timing control circuit unit 10 and the display panel unit 30 to receive the timing control signal and generate a plurality of pixel electrode driving signals to the pixel electrodes 31 of the display panel unit 30, and to generate a plurality of line electrode driving signals to the line electrodes 32 of the display panel unit.

[0012] In this embodiment, the timing control circuit unit 10 includes a clock output terminal (clk), a display output enable control terminal (doe), a display output ground control terminal (dog), and a display start signal control terminal (dsp). The functions of the clock output terminal (clk), the display output enable control terminal (doe), the display output ground control terminal (dog), and the display start signal control terminal (dsp) of the timing control circuit unit 10 are the same as those of the timing control circuit unit of a conventional multi-stable display, and will not be described in detail here. In addition, the timing control circuit unit 10 also includes a plurality of data output terminals, such as the first to the (m+1)th data output terminals (data 0 to data m), and a plurality of scan output terminals, such as the first to the (n+1)th scan output terminals (scan 0 to scan n).

[0013] Referring to Figures 3A to 3C, the timing control signal includes a portion of update control signal 101, multiple data signals 11, and multiple scan signals 12. The data signals 11 include multiple pixel electrode waveform data 111, each corresponding to a pixel electrode 31. The scan signals 12 include multiple line electrode waveform data 121, each corresponding to a line electrode 32. In this embodiment, the timing control circuit unit 10 further includes a portion of update signal control port (dzh), which outputs the portion of update control signal 101.

[0014] For example, as shown in Figure 3B, the data signal 11 has first to third data signals data 0~2. The pixel electrode waveform data 111 has first to third pixel electrode waveform data 1111~1114, which correspond to the pixel electrodes 31 in the first to third rows, respectively. The first pixel electrode waveform data 1111 in the first to third data signals data 0~2 is pixel 1 (0)~(2), which corresponds to the pixel electrode 31 in the first row. Pixel 1 (0)~(2) are 1-bit information, which can be combined into a 3-bit binary data. For example, pixel 1 (0)~(2) can be combined into the binary data "100", representing the decimal number 4.

[0015] Similarly, as shown in Figure 3C, the scan signal 12 has first to third scan signals scan 0~2. The line electrode waveform data 121 has first to third line electrode waveform data 1211~1213, which correspond to the line electrodes 32 in the first to third columns, respectively. The first line electrode waveform data 1211 in the first to third data signals scan 0~2 is line 1 (0)~(2), and line 1 (0)~(2) are 1 bit information, which can be combined into a 3 bit binary data. For example, line 1 (0)~(2) can be combined into the binary data "100", which represents the decimal 4.

[0016] Since the pixel is located at the intersection of the pixel electrode 31 and the line electrode 32, each pixel corresponds to one pixel electrode 31 and one line electrode 32. For example, the pixels in the first column and first row correspond to the pixel electrode 31 in the first row and the line electrode 32 in the first column.

[0017] The update control signal 101 includes at least one update control signal 1011 and at least one non-update control signal 1012. The update control signal 1011 corresponds to the pixel electrode waveform data 111 and the line electrode waveform data 121 corresponding to the pixel to be updated, and the non-update control signal 1012 corresponds to the pixel electrode waveform data 111 and the line electrode waveform data 121 corresponding to the non-update pixel. The pixel electrode driving signals include at least one pixel electrode update signal and at least one pixel electrode sustaining signal, and the line electrode driving signals include at least one line electrode update signal and at least one line electrode sustaining signal.

[0018] In this embodiment, the control signal to be updated 1011 is a low voltage level signal, and the non-updating control signal 1012 is a high voltage level signal.

[0019] For example, as shown in Figures 3A to 3C, the update control signal 1011 corresponds to the first pixel electrode waveform data 1111 and the first line electrode waveform data 1211. The non-update control signal 1012 corresponds to the second to fourth pixel electrode waveform data 1112~1114 and the second to fourth line electrode waveform data 1212~1214.

[0020] In other words, the pixels at the intersection of the pixel electrode 31 in the first row and the line electrode 32 in the first column of the pixel system to be updated. And the pixels at the intersection of the pixel electrode 31 in the second to fourth rows and the line electrode 32 in the second to fourth columns of the non-updated pixel system.

[0021] The driving circuit unit 20 outputs the pixel electrode update signal and the line electrode update signal to the pixel electrode 31 and the line electrode 32 corresponding to the pixel to be updated, and outputs the pixel electrode sustain signal and the line electrode sustain signal to the pixel electrode 31 and the line electrode 32 corresponding to the non-updated pixel. The voltage difference generated by the pixel electrode update signal and the line electrode update signal on the pixel to be updated is greater than or equal to a pixel voltage transition value.

[0022] The multi-stable display device updates a partial image without affecting the color difference of the other pixels in the same column by outputting the pixel electrode sustain signal and the line electrode sustain signal to the pixel electrode 31 and the line electrode 32 corresponding to the non-updating pixel. This further overcomes the problem of brightness and color difference that multi-stable display devices are prone to when updating a partial image.

[0023] In other words, the multi-stable display device updates only the pixel to be updated using the pixel electrode update signal and the line electrode update signal, while for the non-updated pixel, it maintains its color difference using the pixel electrode hold signal and the line electrode hold signal.

[0024] In other words, the pixel electrode sustaining signal and the line electrode sustaining signal maintain the color difference between the pixel to be updated and the non-updated pixel. In this embodiment, the pixel electrode sustaining signal and the line electrode sustaining signal are respectively a high-impedance (HiZ) voltage signal or a high-frequency voltage signal. Furthermore, the voltage difference generated by the pixel electrode sustaining signal and the line electrode sustaining signal on the non-updated pixel is less than the pixel voltage transition value.

[0025] The high-impedance voltage signal signifies that by generating an open-circuit voltage signal, the energy of the output voltage to the pixel is stopped. Furthermore, unlike the pixel that needs updating, the non-updating pixel does not require updating; that is, it maintains its original color difference without needing to be updated. In other words, there is no need to provide voltage energy to the non-updating pixel to cause its cholesteric liquid crystal to transition. Therefore, the driving circuit unit 20 stops the output voltage energy to the non-updating pixel by outputting the high-impedance voltage signal, thereby maintaining the color difference of the non-updating pixel.

[0026] The principle of this high-frequency voltage signal is to generate a rapidly alternating positive and negative voltage signal to the cholesteric liquid crystal of the non-renewing pixel. Since the high-frequency voltage signal is a high-frequency signal, even though the cholesteric liquid crystal can receive the alternating positive and negative voltage energy, under the rapid frequency switching, the voltage signal level received by the cholesteric liquid crystal is equivalent to the signal level of the same voltage value. The cholesteric liquid crystal also has a charging and discharging characteristic curve like a capacitor. If it cannot continuously accumulate enough voltage energy to be charged, that is, if it cannot obtain enough voltage energy to change state, the non-renewing pixel can maintain the original color difference without changing state, that is, without renewal.

[0027] Please refer to Figures 4A to 4C. In a first embodiment, the data signals 11 include pixel electrode header setting data 110 and pixel electrode waveform data 111.

[0028] When the driving circuit unit 20 receives the pixel electrode header setting data 110, the driving circuit unit 20 sets a data voltage configuration truth table according to the pixel electrode header setting data 110. When the driving circuit unit 20 receives the pixel electrode waveform data 111, the driving circuit unit 20 generates the pixel electrode driving signal according to the pixel electrode waveform data 111 and the data voltage configuration truth table.

[0029] The scan signals 12 include line electrode header setting data 120 and line electrode waveform data 121. When the drive circuit unit 20 receives the line electrode header setting data 120, the drive circuit unit 20 sets a scan voltage configuration truth table according to the line electrode header setting data 120. When the drive circuit unit 20 receives the line electrode waveform data 121, the drive circuit unit 20 generates the line electrode drive signal according to the line electrode waveform data 121 and the scan voltage configuration truth table.

[0030] In addition, the timing control signal also includes a header setting signal 102. When the data signals 11 are pixel electrode header setting data 110 or the scan signals 12 are line electrode header setting data 120, the header setting signal 102 is a high voltage level. And when the data signals 11 are pixel electrode waveform data 111 or the scan signals 12 are line electrode waveform data 121, the header setting signal 102 is a low voltage level.

[0031] Please refer to Figure 5. In this embodiment, the partial update signal control port (dzh) of the timing control circuit unit 10 includes a data partial update signal control terminal (data_dzh) and a scan partial update signal control terminal (scan_dzh).

[0032] For example, as shown in Figures 6A to 6C, the data partial update signal control terminal (data_dzh) outputs a data partial update control signal 101a. This data partial update control signal 101a includes a data update control signal 1011a and a data non-update control signal 1012a. According to the data partial update control signal 101a, the data update control signal 1011a corresponds to the first pixel electrode waveform data 1111, while the data non-update control signal 1012a corresponds to the second to fourth pixel electrode waveform data 1112~1114. In other words, the driving circuit unit 20 generates a pixel electrode driving signal to the pixel electrode 31 in the first row and generates a pixel electrode maintenance signal to the pixel electrodes 31 in the second to fourth rows.

[0033] Furthermore, the driving circuit unit 20 sets the output of the data voltage configuration truth table according to the content of the pixel electrode header setting data 110, and the driving circuit unit 20 uses the pixel electrode waveform data 111 as the input of the data voltage configuration truth table, and generates the voltage value of the pixel electrode driving signal by looking up the table. For example, the data voltage configuration truth table can be set as shown in Table 1 below. Pixel electrode waveform data (input) Voltage value (output) of pixel electrode drive signal 00 V2 01 V3 10 V5 11 V6 Table 1

[0034] For example, as shown in Figures 6B and 6C, the pixel electrode waveform data to be updated corresponding to the pixel to be updated is the first pixel electrode waveform data 1111. As shown in Figures 7A and 7B, when the pixel electrode waveform data to be updated, i.e., the first pixel electrode waveform data 1111, is "00", the driving circuit unit 20 generates a pixel electrode driving signal 211 with a voltage value of a second voltage V2 to the pixel electrode 31 of the first row of the display panel unit 30. And when the pixel electrode waveform data to be updated, i.e., the first pixel electrode waveform data 1111, is sequentially adjusted to "01", "10", and "11", the driving circuit unit 20 sequentially generates a pixel electrode driving signal 211 with a voltage value of a third voltage V3, a fifth voltage V5, and a sixth voltage V6 to the pixel electrode 31 of the first row of the display panel unit 30.

[0035] The principle of these scan signals 12 is similar to that of the data signals 11. For example, as shown in Figures 8A to 8C, the scan partial update signal control terminal (scan_dzh) outputs a scan partial update control signal 101b. This scan partial update control signal 101b includes a scan to-be-updated control signal 1011b and a scan non-updated control signal 1012b. According to the scan partial update control signal 101b, the scan to-be-updated control signal 1011b corresponds to the first line electrode waveform data 1211, while the scan non-updated control signal 1012b corresponds to the second to fourth line electrode waveform data 1212~1214. In other words, the drive circuit unit 20 generates a line electrode drive signal to the line electrode 32 in the first column and generates a line electrode maintenance signal to the line electrode 32 in the second to fourth columns.

[0036] Furthermore, the drive circuit unit 20 also determines the line electrode drive signal by looking up a table, but the difference is that the drive circuit unit 20 determines the line signal waveform of the line electrode drive signal by looking up a table. For example, since the line signal waveform of the line electrode drive signal is one of several fixed waveforms, the scan voltage configuration truth table can be a pre-set table that sets several fixed waveforms of the line signal waveform. For example, the scan voltage configuration truth table can be set as shown in Table 2 below, where waveform A can be a reset waveform (RESET) and waveform B is a display waveform (CDS). Line electrode waveform data (input) Voltage value of the line electrode drive signal (output) 00 Waveform A 01 B waveform Table 2

[0037] For example, as shown in Figures 8B and 8C, the line electrode waveform data to be updated corresponding to the pixel to be updated is the first line electrode waveform data 1211. As shown in Figures 9A and 9B, when the line electrode waveform data to be updated, i.e., the first line electrode waveform data 1211, is "01", the line signal waveform of the line electrode drive signal 221 generated by the drive circuit unit 20 is the B waveform. For example, the B waveform is a waveform that first outputs the sixth voltage V6 and then outputs the third voltage V3. And the drive circuit unit 20 outputs the line electrode drive signal 221 to the line electrode 32 of the first column of the display panel unit 30.

[0038] Referring to Figure 10C, in a second embodiment, the data signals 11 also include the pixel electrode header setting data 110 and the pixel electrode waveform data 111. The driving circuit unit 20 determines a pixel electrode voltage value of the pixel electrode driving signal based on the pixel electrode header setting data 110, and the driving circuit unit 20 determines a pixel driving duration for outputting the pixel electrode voltage value based on the pixel electrode waveform data 111.

[0039] Please refer to Figure 12C. The scan signals 12 also include the line electrode header setting data 120 and the line electrode waveform data 121. The drive circuit unit 20 determines the line signal waveform of the line electrode drive signal based on the line electrode waveform data 121.

[0040] Furthermore, as shown in Figures 10A to 10C, the pixel electrode header setting data 110 includes a first pixel electrode positive voltage value 1101, a second pixel electrode positive voltage value 1102, a first pixel electrode negative voltage value 1103, and a second pixel electrode negative voltage value 1104.

[0041] The pixel electrode waveform data 111 at least includes the pixel electrode waveform data to be updated, and the pixel electrode waveform data to be updated includes a number of pixel electrode voltage units to be updated. In this embodiment, the pixel electrode waveform data to be updated is the first pixel electrode waveform data 1111, and the number of pixel electrode voltage units to be updated is a first pixel electrode voltage unit number of the first pixel electrode waveform data 1111. The driving circuit unit 20 has a total pixel electrode duty count, and the driving circuit unit 20 subtracts the number of pixel electrode voltage units to be updated from the total pixel electrode duty count to determine a remaining number of pixel electrode voltage units to be updated. When the driving circuit unit 20 determines the pixel driving duration based on the pixel electrode waveform data 111, the driving circuit unit 20 determines a first pixel driving duration based on the number of pixel electrode voltage units to be updated in the pixel electrode waveform data 111, which outputs a pixel electrode driving signal having the first pixel electrode positive voltage value 1101 to the pixel to be updated; the driving circuit unit 20 determines a second pixel driving duration based on the number of remaining pixel electrode voltage units to be updated, which outputs a pixel electrode driving signal having the second pixel electrode positive voltage value 1102 to the pixel to be updated; the driving circuit unit 20 determines a third pixel driving duration based on the number of pixel electrode voltage units to be updated in the pixel electrode waveform data 111, which outputs a pixel electrode driving signal having the first pixel electrode negative voltage value 1103 to the pixel to be updated; and the driving circuit unit determines a fourth pixel driving duration based on the number of remaining pixel electrode voltage units to be updated, which outputs a pixel electrode driving signal having the second pixel electrode negative voltage value 1104 to the pixel to be updated.

[0042] In this embodiment, the pixel electrode header setting data 110 includes pixel electrode voltage data and a total number of active pixel electrodes data. The driving circuit unit 20 determines the pixel electrode voltage value of the pixel electrode driving signal based on the pixel electrode voltage data in the pixel electrode header setting data 110. Furthermore, the driving circuit unit 20 sets the total number of active pixel electrodes based on the total number of active pixel electrodes data in the pixel electrode header setting data 110.

[0043] For example, as shown in Figure 1, the timing control circuit unit 10 includes first to third data output terminals (data 0 to data 2), but is not limited thereto. The pixel electrode waveform data packet includes first to third pixel electrode waveform data 1111 to 1113, but is not limited thereto. The number of pixel electrode waveform data depends on the number of pixel electrodes 31. For example, in this embodiment, the example is given where the display panel unit 30 includes four pixel electrodes 31.

[0044] In this embodiment, as shown in FIG10C, the positive voltage value 1101 of the first pixel electrode is the first value of the first to third data output terminals (data 0 to data 2), and the positive voltage value 1101 of the first pixel electrode is represented by a 3-bit binary scan, namely V2(0) to V2(2), corresponding to a second voltage V2. The positive voltage value 1102 of the second pixel electrode is the second value of the first to third data output terminals (data 0 to data 2), and the positive voltage value 1102 of the second pixel electrode is also represented by a 3-bit binary scan, namely V3(0) to V3(2), corresponding to a third voltage V3. Similarly, the negative voltage value 1103 of the first pixel electrode is the third value of the first to third data output terminals (data 0 to data 2), and the negative voltage value 1103 of the first pixel electrode is represented by a 3-bit binary scan, namely V5(0) to V5(2), corresponding to a fifth voltage V5. The negative voltage value 1104 of the second pixel electrode is the fourth value of the first to third data output terminals (data 0 to data 2), and the negative voltage value 1104 of the second pixel electrode is also represented by a 3-bit binary scan, namely V6(0) to V6(2), corresponding to a sixth voltage V6.

[0045] The number of pixel electrode voltage units to be updated is the value of the first to third data output terminals (data 0 to data 2), and the number of pixel electrode voltage units to be updated is represented by a 3-bit binary scan. For example, the pixel to be updated corresponds to the first pixel electrode waveform data 1111, i.e., pixel 1 (0) to pixel 1 (2). In addition, the second to fourth pixel electrode waveform data 1112 to 1114 each contain a second to fourth pixel electrode voltage unit. Similarly, the number of second pixel electrode voltage units is the value of the first to third data output terminals (data 0 to data 2), and the number of first pixel electrode voltage units is also represented by a 3-bit binary scan, i.e., pixel 2 (0) to pixel 2 (2). The remaining third to fourth pixel electrode voltage units are represented in the same way.

[0046] Assume the total number of working pixel electrodes is set to 7. When the voltage unit number of the first pixel electrode in the waveform data 1111 is 100, it represents a decimal value of 4. At this time, the total number of working pixel electrodes minus the voltage unit number of the pixel electrode to be updated, i.e. the voltage unit number of the fifth pixel electrode, is 7-4=3. The driving circuit unit 20 sets the remaining voltage unit number of the pixel electrode to be updated to 3.

[0047] Please refer to Figures 11A and 11B. Since the number of pixel electrode voltage units to be updated, i.e., the first pixel electrode voltage units, is 100, the first pixel driving duration of the pixel electrode driving signal 211 with the first pixel electrode positive voltage value 1101, i.e., the second voltage V2, output by the driving circuit unit 20 to the pixel to be updated is 4 working hours (duty). And since the total number of pixel electrode working is 7, and the number of remaining pixel electrode voltage units to be updated is 3, the second pixel driving duration of the pixel electrode driving signal 211 with the second pixel electrode positive voltage value 1102, i.e., the third voltage V3, output by the driving circuit unit 20 to the pixel to be updated is 3 working hours (duty). Furthermore, after the driving circuit unit 20 outputs the pixel electrode driving signal 211 with the third voltage V3 to the pixel to be updated, the driving circuit unit 20 enters the negative half-cycle time. The driving circuit unit 20 then outputs the pixel electrode driving signal 211 with the first pixel electrode negative voltage value 1103 and the fifth voltage V5 to the pixel to be updated for a first pixel driving duration of 4 working hours (duty). Since the total number of working pixel electrodes is 7, and the number of remaining pixel electrode voltage units to be updated is 2, the second pixel driving duration of the pixel electrode driving signal 211 with the second pixel electrode negative voltage value 1104, i.e., the sixth voltage V6, output by the driving circuit unit 20 to the pixel to be updated is 3 working hours (duty).

[0048] Furthermore, the drive circuit unit 20 determines the line signal waveform of the line electrode drive signal based on the line electrode waveform data 121. Referring to Figures 12A to 12C, the line electrode waveform data 121 at least includes the line electrode waveform data to be updated. In this embodiment, the line electrode waveform data to be updated is the first line electrode waveform data 1211. The drive circuit unit 20 then determines the line signal waveform of the line electrode drive signal output to the line electrode 32 in the first column based on the first line electrode waveform data 1211.

[0049] In this embodiment, the line electrode header setting data 120 includes a scan voltage data and a total number of working line electrodes data. The drive circuit unit 20 sets the total number of working line electrodes according to the total number of working line electrodes data in the line electrode header setting data 120.

[0050] For example, referring to Figures 13A and 13B, assuming the waveform data of the line electrode to be updated, i.e., the first line electrode waveform data, is 100, the driving circuit unit 20 determines, based on the first line electrode waveform data, that the line signal waveform of the line electrode driving signal 221 output to the pixel to be updated is to first output the sixth voltage V6, then output the third voltage V3, and the output duration of the sixth voltage V6 is 1:1 with the output duration of the third voltage V3. Assuming the total number of working line electrodes is 7, the line signal waveform of the line electrode driving signal 221 output by the driving circuit unit 20 to the pixel to be updated is to first output the sixth voltage V6, and the line driving duration is 7 working hours (duty). Next, the driving circuit unit 20 enters the negative half-cycle time, and the line signal waveform output by the driving circuit unit 20 to the line electrode driving signal 221 of the pixel to be updated is to re-output the third voltage V3, and the line driving time is 7 working hours (duty).

[0051] Furthermore, as shown in FIG5, in a third embodiment, the timing control circuit unit 10 further includes a digital-to-analog conversion control terminal (d2a), and the digital-to-analog conversion control terminal (d2a) outputs a digital-to-analog conversion signal.

[0052] Please refer to Figures 14A to 14C. These data signals 11 also include pixel electrode blank data 112, and the pixel electrode blank data 112 follows the pixel electrode waveform data 111.

[0053] The timing control signal also includes the digital-to-analog conversion signal 103. When the data signal 11 is the blank data 112 of the pixel electrode, the digital-to-analog conversion signal 103 is an even multiple of the total number of working pixels.

[0054] As shown in Figure 10C, the pixel electrode header setting data 110 includes a first pixel electrode positive voltage value 1101, a second pixel electrode positive voltage value 1102, a first pixel electrode negative voltage value 1103, and a second pixel electrode negative voltage value 1104. The pixel electrode waveform data 111 includes at least one pixel electrode waveform data to be updated, and this pixel electrode waveform data to be updated includes a number of pixel electrode voltage units to be updated. The pixel electrode waveform data to be updated corresponds to the pixel to be updated. In this embodiment, the pixel electrode waveform data to be updated is the first pixel electrode waveform data 1111, and the number of pixel electrode voltage units to be updated is a number of first pixel electrode voltage units.

[0055] As shown in Figures 14A to 14C, when the driving circuit unit 20 determines the pixel driving duration based on the pixel electrode waveform data 111, the driving circuit unit 20 outputs a pixel electrode driving signal 211 with the first pixel electrode positive voltage value 1101 to the pixel to be updated between the counting signals of the digital-to-analog conversion signal 103 when it is the 1st to the Ath signal, and the driving circuit unit 20 outputs a second pixel electrode positive voltage value 1102 between the counting signals of the digital-to-analog conversion signal 103 when it is the (A+1)th to the Bth signal. The pixel electrode driving signal 211 is sent to the pixel to be updated, and the driving circuit unit 20 outputs the pixel electrode driving signal 211 with the first pixel electrode negative voltage value 1103 to the pixel to be updated between the (B+1)th and (A+B)th counting signals of the digital-to-analog conversion signal 103, and the driving circuit unit 20 outputs the pixel electrode driving signal 211 with the second pixel electrode negative voltage value 1104 to the pixel to be updated between the (A+B+1)th and (2B)th counting signals of the digital-to-analog conversion signal 103. In this embodiment, A is the number of voltage units of the pixel electrode to be updated, and B is the total number of working pixel electrodes.

[0056] For example, as shown in Figure 10C, assuming the number of units of the pixel electrode voltage to be updated, i.e., the number of units of the first pixel electrode voltage (pixel 1 (0) ~ pixel 1 (2)) in the first pixel electrode waveform data 1111, is 100, the first pixel driving duration of the pixel electrode driving signal 211 with the first pixel electrode positive voltage value 1101, i.e., the second voltage V2, output by the driving circuit unit 20 to the pixel to be updated is 4 working hours (duty). Therefore, as shown in Figures 14A to 14C, the driving circuit unit 20 outputs the first to fourth counting signals (1 to 4) at the digital-to-analog conversion control terminal (d2a). duty~ The pixel electrode drive signal 211, which has the first pixel electrode positive voltage value 1101, i.e., the second voltage V2, is output between the digital-to-analog conversion control terminal (d2a) and the pixel electrode drive signal 211, is output to the pixel to be updated. The drive circuit unit 20 outputs the 5th to 7th count signals at the digital-to-analog conversion control terminal (d2a). duty~ The pixel electrode drive signal 211, which has the second pixel electrode positive voltage value 1102, i.e. the third voltage V3, is output between the duty and the pixel electrode drive signal 211 to the pixel to be updated.

[0057] And when the driving circuit unit 20 outputs the pixel electrode driving signal 211 with the third voltage V3 to the pixel to be updated, the driving circuit unit 20 enters the negative half-cycle time, and the driving circuit unit 20 outputs the 8th to 11th counting signals at the digital-to-analog conversion control terminal (d2a). duty~ The drive circuit unit 20 outputs a pixel electrode drive signal 211 with the negative voltage value 1103 of the first pixel electrode, i.e., the fifth voltage V5, to the pixel to be updated. Furthermore, the drive circuit unit 20 outputs the 12th to 14th count signals from the digital-to-analog conversion control terminal (d2a). duty~ The driving circuit unit 20 outputs a pixel electrode driving signal 211 with the negative voltage value 1104 of the second pixel electrode, i.e., the sixth voltage V6, to the pixel to be updated. In this embodiment, the driving circuit unit 20 outputs the pixel electrode driving signal 211 to the pixel electrode 31 corresponding to the pixel to be updated, for example, the pixel electrode 31 in the first row. The driving circuit unit 20 also outputs a pixel electrode maintenance signal to the remaining pixel electrodes 31, for example, the driving circuit unit 20 outputs a high impedance (HiZ) voltage signal or a high frequency voltage signal to the pixel electrodes 31 in the second to fourth rows.

[0058] Furthermore, the driving circuit unit 20 determines the line signal waveform of the line electrode driving signal based on the line electrode waveform data 121. As shown in Figure 12C, assuming the line electrode waveform data to be updated, i.e., the first line electrode waveform data, is 100, the driving circuit unit 20 determines the line signal waveform of the line electrode driving signal 221 output to the pixel to be updated based on the first line electrode waveform data, which is to first output the sixth voltage V6, then output the third voltage V3, and the output duration of the sixth voltage V6 and the output duration of the third voltage V3 are 1:1. And assuming the total number of working line electrodes is 7, as shown in Figures 15A to 15C, the driving circuit unit 20 outputs the first to seventh count signals at the digital-to-analog conversion control terminal (d2a). duty~ The line electrode drive signal 221 with the sixth voltage V6 is output between the duty and the line electrode drive signal 221 to the pixel to be updated.

[0059] And when the driving circuit unit 20 outputs the line electrode driving signal 221 with the sixth voltage V6 to the pixel to be updated, the driving circuit unit 20 enters the negative half-cycle time, and the driving circuit unit 20 outputs the 8th to 14th counting signals at the digital-to-analog conversion control terminal (d2a). duty~ The line electrode drive signal 221 with the third voltage V3 is output between the duty and the line electrode drive signal 221 to the pixel to be updated. In this embodiment, the drive circuit unit 20 outputs the line electrode drive signal 221 to the line electrode 32 corresponding to the pixel to be updated, for example, the line electrode 32 of the first column.

[0060] Furthermore, in the multistable display device with local update mode of the present invention, the counting signal of the digital-to-analog conversion signal 103 output by the digital-to-analog conversion control terminal (d2a) is used for counting. The data output terminals only need to complete the transmission of waveform data before the rising edge of the first counting signal. Therefore, after the waveform data of the last frame is output, the data output terminals do not need to output the waveform data again. In other words, after the waveform data of the last frame is output, the data output terminals do not need to output waveform data during the period of the counting signal output by the digital-to-analog conversion control terminal (d2a). For example, assuming the voltage waveform of the last frame has four duty periods, the data output terminals need to complete the transmission of the waveform data of the last frame before the rising edge of the first counting signal, and during the counting period of the first to fourth counting signals of the last frame, the data output terminals do not need to transmit waveform data again.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0062] 10: Timing control circuit unit 101: Partial Update Control Signal 1011: Control signal to be updated 1012: Non-updating control signal 101a: Data Partial Update Control Signal 1011a: Data pending update control signal 1012a: Data Non-Update Control Signal 101b: Scan Partial Update Control Signal 1011b: Scan for control signals to be updated 1012b: Scanning Non-Update Control Signal 11: Data Signal 110: Pixel electrode header setting data 1101: Positive voltage value of the first pixel electrode 1102: Positive voltage value of the second pixel electrode 1103: Negative voltage value of the first pixel electrode 1104: Negative voltage value of the second pixel electrode 111: Pixel electrode waveform data 1111~1114: Electrode waveform data for the first to fourth pixels 112: Pixel Electrode Blank Data 12: Scanning signal 120: Line electrode reference head setting data 1201: Positive voltage value of the first line electrode 1202: Positive voltage value of the second circuit electrode 1203: Negative voltage value of the first line electrode 1204: Negative voltage value of the second circuit electrode 121: Line electrode waveform data 1211~1214: Waveform data of the first to fourth line electrodes 122: Blank data for circuit electrodes 20: Drive circuit unit 30: Display panel unit 31: Pixel Electrode 32: Circuit Electrode clk: Clock output terminal doe: Display output enable control terminal dog: Display output ground control terminal d2a: Digital-to-Analog Conversion Control Terminal DSP: Display Start Signal Control Terminal dsh: Header setting control terminal dzh: Partial update signal control port data_dzh: Data section updates signal control terminal scan_dzh: Scan part update signal control terminal scan 0~scan n: First to (n+1)th scan output terminals scan[2:0]: Output terminals for the first to third scans data 0~data m: First to m+1 data output terminals data[2:0]: First to third data output terminals

Claims

1. A multistable display device with a local update mode, comprising: a timing control circuit unit for generating a timing control signal; and a display panel unit having a plurality of pixel electrodes and a plurality of line electrodes; wherein, Each pixel electrode and each line electrode intersect at one of their respective locations to form a pixel, and the pixel includes at least one pixel to be updated and at least one non-updated pixel; and a driving circuit unit is connected to the timing control circuit unit and the display panel unit to receive the timing control signal and generate a plurality of pixel electrode driving signals to the pixel electrodes of the display panel unit, and generate a plurality of line electrode driving signals to the line electrodes of the display panel unit; wherein the timing control signal includes a portion of update control signal, a plurality of data signals and a plurality of scan signals; wherein the data signals include a plurality of pixel electrode waveform data, and the pixel electrode waveform data respectively correspond to the pixel electrodes; wherein the scan signals include a plurality of line electrode waveform data, and the line electrode waveform data respectively correspond to the line electrodes; The update control signal includes at least one update control signal and at least one non-update control signal. The update control signal corresponds to the pixel electrode waveform data of the pixel electrode and the line electrode waveform data of the line electrode corresponding to the pixel to be updated, and the non-update control signal corresponds to the pixel electrode waveform data of the pixel electrode and the line electrode waveform data of the line electrode corresponding to the non-update pixel. The pixel electrode driving signals include at least one pixel electrode update signal and at least one pixel electrode sustaining signal, and the line electrode driving signals include at least one line electrode update signal and at least one line electrode sustaining signal. The driving circuit unit outputs the pixel electrode update signal and the line electrode update signal to the pixel electrode and the line electrode corresponding to the pixel to be updated, and outputs the pixel electrode sustaining signal and the line electrode sustaining signal to the pixel electrode and the line electrode corresponding to the non-update pixel. Wherein, the voltage difference generated by the pixel electrode update signal and the line electrode update signal on the pixel to be updated is greater than or equal to a pixel voltage transition value, and the other voltage difference generated by the pixel electrode sustain signal and the line electrode sustain signal on the non-updated pixel is less than the pixel voltage transition value.

2. A multistable display device with a local update mode as described in claim 1, wherein, The control signal to be updated is a low voltage level signal, and the non-updating control signal is a high voltage level signal.

3. A multistable display device with a local update mode as described in claim 2, wherein, The pixel electrode sustain signal and the line electrode sustain signal are both high-impedance voltage signals.

4. A multistable display device with a local update mode as described in claim 1, wherein, The pixel electrode sustain signal and the line electrode sustain signal are both high-frequency voltage signals.

5. A multistable display device with a local update mode as described in claim 1, wherein, These data signals include pixel electrode header setting data and pixel electrode waveform data; wherein, when the driving circuit unit receives the pixel electrode header setting data, the driving circuit unit sets a data voltage configuration truth table according to the pixel electrode header setting data; wherein, when the driving circuit unit receives the pixel electrode waveform data, the driving circuit unit generates the pixel electrode driving signal according to the pixel electrode waveform data and the data voltage configuration truth table.

6. A multistable display device with a local update mode as described in claim 5, wherein, The timing control signal also includes a header setting signal; wherein, when the data signals are the pixel electrode header setting data, the header setting signal is a high voltage level.

7. A multistable display device with a local update mode as described in claim 1, wherein, These data signals include pixel electrode header setting data and pixel electrode waveform data; wherein, the driving circuit unit determines the pixel electrode voltage value of the pixel electrode driving signal based on the pixel electrode header setting data, and the driving circuit unit determines the pixel driving duration for outputting the pixel electrode voltage value based on the pixel electrode waveform data.

8. A multistable display device with a local update mode as described in claim 7, wherein, The pixel electrode header setting data includes a first pixel electrode positive voltage value, a second pixel electrode positive voltage value, a first pixel electrode negative voltage value, and a second pixel electrode negative voltage value; wherein, the pixel electrode waveform data includes at least one pixel electrode waveform data to be updated, and the pixel electrode waveform data to be updated includes a number of pixel electrode voltage units to be updated; wherein, the driving circuit unit has a total number of working pixel electrodes, and the driving circuit unit subtracts the number of pixel electrode voltage units to be updated from the total number of working pixel electrodes to determine a remaining number of pixel electrode voltage units to be updated; Specifically, when the driving circuit unit determines the pixel driving duration based on the pixel electrode waveform data, the driving circuit unit determines a first pixel driving duration based on the number of units of the pixel electrode voltage to be updated in the pixel electrode waveform data, and outputs a pixel electrode driving signal with the first pixel electrode positive voltage value to the pixel to be updated. The driving circuit unit determines a second pixel driving duration based on the number of units of the remaining pixel electrode voltage to be updated, and outputs a pixel electrode driving signal with the second pixel electrode positive voltage value to the pixel to be updated. The driving circuit unit determines a third pixel driving duration based on the number of units of the pixel electrode voltage to be updated in the pixel electrode waveform data, and outputs a pixel electrode driving signal with the first pixel electrode negative voltage value to the pixel to be updated. The driving circuit unit determines a fourth pixel driving duration based on the number of units of the remaining pixel electrode voltage to be updated, and outputs a pixel electrode driving signal with the second pixel electrode negative voltage value to the pixel to be updated.

9. A multistable display device with a local update mode as described in claim 7, wherein, The data signals also include pixel electrode blank data, which is contiguous after the pixel electrode waveform data; wherein the driving circuit unit has a total number of active pixel electrodes; wherein the timing control signal also includes a digital-to-analog conversion signal; wherein when the data signal is the pixel electrode blank data, the digital-to-analog conversion signal is an even multiple of the total number of active pixel electrodes.

10. A multistable display device with a local update mode as described in claim 9, wherein, The pixel electrode header setting data includes a first pixel electrode positive voltage value, a second pixel electrode positive voltage value, a first pixel electrode negative voltage value, and a second pixel electrode negative voltage value; wherein, the pixel electrode waveform data includes at least one pixel electrode waveform data to be updated, and the pixel electrode waveform data to be updated includes a number of pixel electrode voltage units to be updated; wherein, when the driving circuit unit determines the pixel driving duration based on the pixel electrode waveform data, the driving circuit unit outputs a pixel electrode driving signal with the first pixel electrode positive voltage value to a pixel to be updated between the counting signals of the first to the Ath pixel electrode voltage units of the digital-to-analog conversion signal, and the driving circuit unit outputs a pixel electrode driving signal with the second pixel electrode positive voltage value between the counting signals of the A+1th to the Bth pixel electrode voltage units of the digital-to-analog conversion signal. The driving circuit unit outputs a pixel electrode driving signal with the first pixel electrode negative voltage value to the pixel to be updated between the counting signals of the (B+1)th to the (A+B)th pixel electrode voltage units, and outputs a pixel electrode driving signal with the second pixel electrode negative voltage value to the pixel to be updated between the counting signals of the (B+B+1)th to the 2Bth pixel electrode voltage units; wherein A is the number of pixel electrode voltage units to be updated, and B is the total number of working pixel electrodes.

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