TW201217879A - Driving method for an electrophoretic display - Google Patents

Abstract

A driving method of an electrophoretic display device includes when beginning to display a first frame, applying a common voltage to all pixels of the first frame. When completing applying the common voltage to at least one pixel displaying a first grey level in the first frame, driving the at least one pixel to an initial state. After driving the at least one pixel to the initial state, driving the at least one pixel to the first grey level. This way, when displaying a frame of multiple grey levels, pixels displaying different grey levels will not enter the refresh process altogether, thereby reducing flickers when switching frames.

Description

201217879 VI. Description of the Invention: [Technical Field] The present invention relates to a method of driving electronic paper, and more particularly to a driving method for improving the flicker caused when an electronic paper is updated. [Prior Art] Paper is a widely used display device because paper has a wide viewing angle, is light and soft, and is easy to carry. However, the production of traditional paper consumes a lot of natural resources, and the information on traditional paper is not renewable or can only be updated a few times. Recently, the electronic paper display device (EpD) has been able to take advantage of the advantages of paper and the electronic device can be more difficult to hide, and is gradually being widely used. »Refer to Figure 1 for the month. Fig. 1 is a view showing a conventional driving method for driving an electronic paper display device to display a different gray scale G _Gg in the first frame T1. The electronic paper display device can be divided into three stages when the display of different gray scales is displayed, and the sequence is as follows: the material removal stage 10 data writing stage 1〇2 and the data stationary stage ι〇3. For the second =: leave a residual image when the screen is displayed. 'The electronic paper display will be set before the data is written. The initial recording of the element can be based on different needs. For example, the electronic paper display device can drive all the display devices, such as self- or gray, before writing the data. More specifically, the data clearing phase 1〇1 is performed before the electronic paper ., , and the data writing stage 102. 201217879 When performing the f frame, the __ method_e-paper display device is ordered. In the turn-and-clear stage (9), the drive is all recorded to - initial (four) " for example, electronic, = no device, the display of the black-faced display is displayed on the axis display, and the device is not driven. After the face is written, the data is written to the step: the data is cleared to the screen again - the black screen is displayed repeatedly and then the white surface is displayed (or the white:: number is displayed first. As shown in Fig. 1, regardless of the electronic paper display == except stage (8)' The electronic paper display device 2 drives the black screen and then applies it to drive the white screen. g, (4) Time period Tw

In the graying stage 102, the 'electronic paper display device drives the element to the second to be displayed. = The corresponding gray value is Gg' to output different driving voltages. - Two: -Tgg. For example, the electronic paper display device applies a positive voltage Vpos through the __ 昼 显 显 显 显 显 显 , 或 或 或 或 或 或 或 或 或 或 或 或 或 或 显 显 显 显 显 显 显 显 显 显 显 显 显 显 显 显 显 显 显This type of push. By: All the gray scales that the pixels want to display are not the same, but the different gray scales need: and not, so all the elements need not complete the data clearing phase 101 and the data writing step 12 The same as the 'thus electronic_display device in the data static phase 103 applies a common voltage to the first reaction of the completed halogen (C〇m_ vokage) 201217879

Vcom passes through a period of inactivity and ends with a frame τι. A check count "remembers that the charged particles enter a stationary state until the first suffix in the bedding write phase 102 of the writing period τ τ corresponds to a different static segment Τ _ Τ 私 私 私 Tg "Tgg is the same period, that is, When the book wants to show the total response of each gray scale, the longer the write _ segment required for the gray level is (for example, a south gray level), the corresponding stationary period _, and vice versa. And 'this traditional driving method in the data clearing stage (10), the electronic paper display device = drive all the pixels to make the display screen display the black surface and display the time of the white surface. Therefore, the user will watch the electronic paper display device Obviously, there will be a phenomenon of black-alternate display on the face. For example, the user receives the reflected light (black screen) of the electronic paper display factory and the device king _a surface at the time & At the time of receiving the electronic paper display device, the reflected light (black screen) of 〇% is converted to 1% of the reflected light (white enamel surface). Therefore, the electronic paper display device is switched at each frame. The process of kneading will have a noticeable flickering effect, which will easily affect the user's viewing. SUMMARY OF THE INVENTION The present invention discloses a method of driving an electronic paper. The driving method includes simultaneously starting to display a first frame while simultaneously applying a common voltage to all of the elements of the first frame; In the first frame of the first frame, the at least one of the -th gray scales is used to 'drive the at least one element to the initial state; and when the element is driven to the initial state Driving the at least one pixel to the first gray level. [Embodiment] 201217879 The display element has 4 colors. The spirit of the present invention is to control the time of the electronic paper display device: ===! The pixels are not caused by the different gray scales," q. In addition to the stage, the degree of flickering is reduced in the process of switching between the faces. Please refer to Figure 2. Fig. 2 is a schematic diagram showing the driving method of the invention driving the electronic paper display device in a first frame T1 showing different gray scales G wide G 〆. The driving method of the present invention can be divided into three stages when driving the pixels of the electronic paper display device to display different gray levels. The sequence is as follows: the data inactivity phase 2 and the data erasing phase plus the data writing phase 203. When the first frame is displayed, the electronic paper display device enters the data stationary phase 2 (Π, to apply a common voltage to each element according to the gray scale to be displayed by each element (common ν〇1_Vcom a stationary period) Different gray scales G _Gg correspond to different static periods TcomrTcomg, where g is a positive integer. In the data stationary stage 201, the static period TC〇mrTCOm# different for each pixel in displaying different gray levels GrGg Therefore, the time for each pixel to enter the clearing phase 2〇2 φ when displaying different gray levels is also different. According to the static period T_rT_g' required for each pixel to display different gray levels GrGg, when the electronic paper display device ends to the first When the halogen applies a common voltage Vcom, the first element enters the data clearing stage 2〇2. In the material clearing stage 202, the electronic paper display device drives the first pixel to an initial state. In the embodiment, all the pixels of the first frame T1 are driven to the initial state for the same length of time, that is, the data length of the data clearing stage 202 201217879 corresponding to all the gray levels GrGg is the same (ie, the corresponding The gray scale is called the time period Tb and π. When the electronic paper display device drives the first element to the initial state, the first book Xin enters the data writing stage 203, that is, the electronic paper display device drives the first element to the display. Gray scale. Assuming that the gray level G1 is a minimum gray level, when the first element wants to display the gray level G1, the first element requires the shortest writing period Tgi and the longest stationary period τ_!; and the gray level ^ is - The highest gray level, when the first-picture element wants to display the gray-scale Gg, the first-side surface is the longest g-writing period and the shortest static period Tc〇mg; the gray level q and the gray ash are both Corresponding to the writer period and the stationary period, and so on. Taking Figure 2 as an example, when a painting with multiple gray scales is displayed, 'the pixels belonging to the higher gray level (with a shorter stationary period) will enter first. The data clearing phase is 2〇2, while the lower grayscale pixels (having a longer stationary period) enter the data clearing phase 2〇2 later. In other words, the higher grayscale first pixel response enters the data write. Stage 203' shows the lower gray level pixels and then reacts to the data writing stage 2〇3. Therefore, The electronic paper display device is sequentially entered into the data clearing phase 2〇2 and the data writing phase 2〇3 according to its gray scale. In other words, the user will see gray-like switching during the face-to-face switching process. The effect of order diffusion is so that no obvious black and white flickering surface is visible. The driving method of the present invention is not limited to the advance reaction of the pixel showing the higher gray level into the data writing stage 203, and the display is lower. The gray scale element is then reacted into the data writing stage 203. In another embodiment, the gray level G1 is assumed to be a highest gray level, and when the first element is to display the gray level Gi, the first element needs to be The shortest writing period Tgi and the longest static period Tcom!; and the gray level Gg is a minimum gray level. When the first element wants to display the 201217879 gray level Gg, the first reading is the longest writing period % and the shortest Static period

Tcomg’; l Yuxiong Gi and the gray-speaking writer's writing period and static time and so on. Thus, when a surface with multiple gray levels is displayed, the pixels belonging to the lower gray level are fortunately still in the stationary period, and will enter the data clearing stage 2〇2, while the higher gray level is longer (longer) The stationary period) enters the data clearing phase 202 later. In other words, the 44 不 不 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先 先In this way, the screen can be switched to private, and the effect of similar gray scales can be achieved, and the obvious whispering can be reduced. ... value sister is that the scale waveform of different gray level GA (different gray scale G drive and the gray level GrGg data static phase 20 data clearing stage 202 靡 ^ ^ MW are pre-calculated. For example, Different gray scale Gl_Gg pairs: 廄 °. Read can be stored as a look-up table flCK) kUP fiber) form. Gray-scale Gi-Gg memory drive _ age-appropriate electronic storage device (such as flash memory) or can be stored in an external storage device switched to an electronic paper display device. Another embodiment of the present invention In the 'when the start of the display - the first frame scale pair - difficult financial 昼 New Zealand - common voltage pass _Ve in the gray scale Gl to display all the first - 昼 施加 施加 施加 VC VC VC VC VC VC VC VC VC VC VC VC VC VC VC After the 4 n^ slightly coffee 1 , the crane wants to show the initial state of the ash after the ash, when driving all the first enamel to the initial state - the electronic paper display device drives all the first pixels to the gray scale & When ending the application of the common voltage Vcom to all the second elements of the 201217879 slave gray g2, after all the $1 checksums of the corresponding grayscale G, the Tcom丨 is driven, the driver wants to display the grayscale & The electron to the complement (four). The surface _ has the second pixel initial state, the second pixel to the pick & so, when the display begins. The scorpion paper display device does not display the grayscale <^ the first painting Sustainability and desire (4)%%. Reading the static period of the steel away from the 21st - the pixel and the second pixel will not enter the initial shape L at the same time 'Can achieve the effect of similar gray-scale diffusion in order, reduce the black-and-white _ picture. 凊 Refer to Figure 3. The third _ is the gray level of the audible display and the gray level of the previous frame, then (4) Figure 2 is a diagram of a crane-to-electronic paper display device. Figure 3 is similar to Figure 2, except that the electronic paper display device is based on the grayscale of the frame and the grayscale of the front-frame. Comparing the results, the corresponding driving waveform is generated to drive the pixel display gray scale. For example, when the picture is smashed, the picture frame is to be read_previous_picture_weight gray level_ (such as Na gray ^Gi, toda (6) Time or difference (for example, when switching gray scales G1 to (8), the electronic paper display device generates a corresponding driving waveform. If the current version of the frame is different from the previous gray scale, the electronic paper display device is not based on the fairy The drive waveform of the mechanical response should be generated to a different degree, for example, when the grammatical switching gray scale G, to G2, or the gray scale Gi to G3, the electronic paper display device generates a corresponding driving waveform. The comparison result of the gray scale of the order and the front-frame is shown in the data static phase 3〇1 system applies the common voltage A pixel is added to complement the data clearing phase 302 and the data writing phase 303 outside the first brewing T1; the data clearing phase 3〇2 defines the required 201217879 clearing waveform due to different grayscale comparison results; The human phase 3G3 also defines the required write waveform for different grayscale comparison results. Taking the waveform corresponding to the grayscale GiG2 as an example, a first pixel displays the grayscale G in the previous frame, ' At the present time, the brewer displays the gray scale & When the first frame τι is started, the electronic paper display device applies a common voltage to the side-by-side phase 3m through the stationary period Te〇mi_2 in the side stationary phase 3m. After the stage 3 (1), the electronic paper display device applies the grayscale & to & required clear waveform to the first pixel in the data clearing phase 3〇2 to pass the corresponding time period. After completing the data clearing phase 3〇2, the electronic paper display device applies grayscale & to (4) to the first pixel in the data writing phase 3〇3, and the ___ writer writes Tg(1) the rest of the gray call & Driven wave 2: 2, C and 11 are positive integers. In addition, the clear waveform or write wave required in the data clear phase 302 or the Becco write phase 303 can be a plurality of square waves or other predetermined waveforms.砰疋为方 ^宗上上'Electric cutting, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ In this way, in the second stage, the display of the grayscale of the magazine will be _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The preferred embodiment of the invention is intended to be within the scope of the present invention. 201217879 [Simplified illustration] 103 > 201 101, 202, 302 102, 203, 303 GrGg data stationary phase data clearing phase data writing phase grayscale

TcompTcortig, Tcomu-Tcom^n, Stationary Temple

Tcomun ' Tcomc.n

Tb, Tw, Trefreshu-Trefresl^-n, time period

Trefresh2_i ' Trefreshc.n

TgrTgg, TgM-Tgh, Tg2-1, Tgc_n Write period Vpos Positive voltage

Vneg Vcom T1 Negative Voltage Common Voltage First Frame

[Description of main component symbols] Fig. 1 is a schematic view showing that the conventional driving method drives the electronic paper display device to display different gray levels in a first frame. Figure 2 is a schematic view showing that the driving method of the present invention drives the electronic paper display device to display different gray levels in a first frame. Figure 3 is a schematic diagram showing that the driving method of the present invention drives the electronic paper display device when the gray scale to be displayed in the lower frame is different from the gray scale displayed in the previous frame.

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Claims (1)

201217879 VII. Application for Patent Park: 1. A method for driving electronic paper, comprising: when starting to display a first frame, simultaneously starting to apply a common voltage to all the elements of the first frame; When the application of the common voltage to at least one of the pixels of the first frame to display a first gray level is ended, 'driving the at least one element to the initial state; and when driving the § 至少 at least - the 昼 至After the initial state, the at least one element is driven to the first gray level.瓦, 〇乂 2. The method of claim 1 is directed to driving the pixel to be displayed in a different gray level to the initial state at a different time. :=::::phase:_1 all the pixels of the box to the lowest gray level I ======= == The method described in which the at least - pixel is driven to the initial state 〇 3 n ” At least - the pixel to the lowest gray level, and then the at least - pixel to the most gray level. 5. 201217879 6. The method of claim i, wherein the at least one element is driven to the first gray The method is to drive the at least one element to the first gray level according to a look-up table method. The method of claim 1, wherein the common voltage is applied to the at least one pixel according to a look-up table method. a predetermined time period. 8. A method for driving electronic paper, comprising: • #starting to display a first frame, simultaneously starting to apply a common voltage to all pixels of the first stick; Driving the at least one first pixel to an initial state when the at least one first pixel of the first gray level is to be displayed in the first frame to drive the at least one first pixel to the initial state; After the initial state, driving the at least one first pixel to the first gray level; • when ending the first frame Depressing at least one second element of a second gray level to apply the common voltage to drive the at least one second element to the initial state; and § the horse area moving at least one first element to the initial After the state, the at least one second pixel is driven to the second gray level. The method of claim 8, wherein the applying the common voltage to the at least one first pixel is The method of claim 8, wherein the driving of the at least one first element to the first gray level is driven by the method of claim 8 The length of time from the at least one second element to the second gray level is different. 8. Pattern: 16