TW200421221A - Active matrix display devices - Google Patents

Abstract

An active matrix display device having current-driven light emitting display pixels uses a modelling circuit outside the display area for modelling the behaviour of a plurality of the display pixels. The modelling circuit is provided with a pixel drive signal derived from the pixel drive signals for the plurality of display pixels. A transistor characteristic of the drive transistor in the modelling circuit is measured and the pixel drive signals for the plurality of display pixels are modified in response to the measured transistor characteristic. This can be used to provide an average correction for threshold voltage drift, and can thereby enable the use of amorphous silicon drive transistors whilst maintaining a simple pixel circuit.

Description

200421221 Description of the invention: The technical field to which the invention belongs] is limited to the present invention pertaining to an active matrix display. "Beibu Lai, especially but not, one, has a thin film exchange with the mother and one pixel. Device [Prior Technology 1—The matrix display device of Xingdian Sunray ’s active matrix electro-optical device is an organic thin-film electro-optic device for polymer materials or light-emitting diode compounds, especially a display device for polymer The ability of these materials to display one or more semiconducting polymers using electroluminescence, light emission, etc. The display elements of the temple include, for example, LEDs or conventional light-emitting semiconductor light elements. Recently organic electricity The development of electroluminescent materials has shown that their practical use in video materials usually includes a layer sandwiched between a pair of electrodes, one of which is transparent and the other a material suitable for injecting holes or electrons into a polymer layer. The sigma material can be processed by chemical vapor deposition or just spin-coated with a solution of easy-to-combine sigma complex. It can also be inkjet printed Organic electroluminescent materials can be arranged to display diode-like characteristics, so that they can provide display functions and exchange functions, and thus can be used in passive display. On the other hand, these materials can be used to have Each pixel includes a display element and an active matrix display device to control the current flowing through the display element. This i display device has a display element addressed by current so that the traditional analog drive plan must supply a Control current to display element. It is known to provide a current source transistor as part of the pixel configuration to supply to the current source transistor.

The gate voltage of O: \ 92 \ 92233.DOC determines the current flowing through 彳 I # Μ ^ pieces at this address stage. A storage capacitor maintains the gate voltage after setting a white slave. Figure 1 shows -ρ, which is placed on the image path, and is used for active matrix addressing electroluminescence display equipment. The display device includes-as shown in box 1 in the figure, it has a row and a matrix array and contains columns (select ） And 仃 （贝 枓） address guide I # 4 溆 A _ 1 k ♦ /, the luminescence display element of the parent and the wood together with related exchange components 2 $ ff »4c & 1 apricot board. For simplicity, only a few images are shown in the figure, and there are hundreds of columns and rows of pixels. The pixels 1 are addressed via column-disk addressing conductors-including peripheral drive circuits connected to the end of each conductor set-column scan drive circuit 8 and-row data drive circuit 9. • The electroluminescence display device 2 includes—here, led is used as its representative symbol and contains one of the active layers of one or more organic electroluminescent materials sandwiched therebetween—the organic light emitting of the counter electrode: the polar body. The display elements of the material together with the relevant active matrix circuit are carried on the side of the -insulating support. The cathode or anode of these display elements is formed of a transparent conductive material. The support is a transparent material such as glass and the electrode of the display element 2 closest to the substrate contains a transparent conductive material such as indium tin oxide (IT0) to allow light emission from the electroluminescent layer to pass through these electrodes and support. Seat so that the viewer can see on the other side of the stand. Throughout the book, the thickness of the organic electroluminescent material layer is between ⑽ and 200 nm. Typical examples of suitable organic electroluminescent materials that can be used for element 2 are known and described in EP-A-0 717446. A combination of polymeric materials as described in W096 / 36959 can also be used. _ Figure 2 shows a known pixel and driver circuit arrangement for providing voltage addressing operation. Each pixel 1 includes the electroluminescent display element 2 and related O: \ 92 \ 92233 DOC -7- 200421221 driving circuit. The driving circuit has an address transistor 16 which is turned on by a column conductor 4 ± _ column address pulse. When the address transistor is turned on, the private voltage on the row conductor 6 can be transmitted to the remaining pixels. In particular, the address transistor M supplies the row of conductor voltage to the source 20 including the driving transistor 22 and the storage capacitor. The row voltage is supplied to the gate of the driving transistor 22, and the interrogator is held at this voltage by the storage capacitor M even after the column address pulse has ended. Is an n-type thin film transistor. The driving transistor 22 in this circuit is implemented.

_Source voltage is fixed. In this way, the storage capacitor 24 keeps the gate-fixed source-no-electrode current flowing through the transistor, thus providing the pixel with the desired current source operation. The n-type driving transistor can be implemented with amorphous silicon. The driving transistor can be implemented as a _ρ type transistor, and this is usually suitable for using polysilicon to implement 0. In the above-mentioned basic pixel circuit, 'for polysilicon circuits, t, due to the statistics of polysilicon particles in the transistor channel Distribution, the threshold voltage of the transistor changes. However, the polysilicon transistor is relatively stable under current and voltage stress, so the critical voltage remains substantially constant. There are many benefits to using an amorphous dream pixel circuit for an active matrix light emitting diode (LED) display. This can be done because the current demand of LED farming equipment decreases with the improvement of device efficiency. For example, organic LED devices and solution-treated organic LED devices have recently made calendering extremely efficient. The threshold voltage variation in non-crystalline silicon transistors is small, at least over a short distance on the substrate, but its threshold voltage is extremely sensitive to voltage stress. The driving transistor needs to apply a high electrical transition beyond the threshold to cause a large change in the threshold voltage, and this

O: \ 92 \ 92233.DOC 200421221 A change depends on the information content of the displayed image. This aging is a serious problem in LED displays driven by amorphous stone transistors. There have been many proposals for voltage-addressed pixel circuits that change the threshold voltage of the driving transistor, usually due to aging. Some suggestions are in per-pixel: the introduction of additional circuit elements so that the threshold voltage for driving the transistor can be measured on each frame: One way to measure the critical voltage is to switch on the driving transistor as part of the address sequence, and to block the driving transistor so that the driving transistor current discharges a capacitor at the gate-source contact of the driving transistor. " At a certain point in time, the capacitor is discharged to a point where the critical voltage of the driving transistor is maintained, and the driving transistor stops conducting. The critical voltage is then stored (ie, measured) on the capacitor. This critical voltage can then be applied To-data input voltage (still use the circuit elements in the pixel) so that the gate voltage provided to the driving transistor is considered within the threshold voltage. These supplementary plans require more complicated pixel configurations and driving plans. [Summary of the Invention] The display device includes a driving transistor including a current-driven light-emitting display display element in a display area, wherein the behavior of a plurality of display pixels is provided. The present invention provides an active matrix display and a display pixel array. Each pixel element And a device for driving the current through the display device further comprises a light-emitting display element for driving the current outside the display area and a current drive, and a At least one board-building circuit of the power transistor '4 At least one modeling circuit is provided with a pixel driving signal taken from one of the pixel driving signals for a plurality of display pixels, wherein the device further includes: Li Jian; ^ the transistor characteristics of the circuit-driven transistor; and

O: \ 92 \ 92233.DOC -9- 200421221 No

A component for modifying a pixel driving signal for a pixel in response to a measured transistor characteristic. U In this device ', the display is modeled with a dummy pixel (or multiples) and the pixel drive signals are appropriately corrected. This allows ^ d pixels to be used in the display area, or it can be modified to adjust the characteristics of the driving transistor. The characteristics of Baori solar body may be the threshold voltage of snow crystals. The analysis of the fake silly sounds and the false pixels determines the generation of a given electricity

Or the gate / source voltage required for some currents ;, L β Therefore, the modeling should take into account other changes in the electrical crystal, such as changes in mobility. Bao Yueyi A single modeling circuit can be used to model all or-0 0 pixels, or to provide a plurality of modeling circuits, each with v n τ +. Should be a subset of the behavior of the pixel subset. For example, the '-display pixel subset may include-columns of display pixels. The image provided to the modeled circuit is turned over ... It can be taken from the supply to a plurality of one-to-one average pixel drive signals. Although this does not correct the characteristics of a driving transistor, this-correction is sufficient in some cases, and the average brightness of the pixels is relatively time-dependent, which is related to television applications. The average of the pixel driving signals can be averaged by using the digital image data for complex images. This digital data is provided to the line, the circuit is moved and immediately available for _ times, and the μ processor is used to correct the information from the pixel building chess circuit. Another option is that the average of the pixel drive signals can be obtained by averaging the supply to the complex number which should display like Xin's experience; If this is the case, a circuit is required to measure the current to different parts of the indicator + σ or. For example, the modeling circuit may include a fixed-scale pixel circuit of a display.

O: \ 92 \ 92233 DOC, 10- 200421221 This circuit has been provided for other tests. As described above, the pixel driving signals may be modified in the row driving circuit. However, the pixel driving signals for the plurality of display pixels may be modified by an additional circuit in every two pixels. For example, a green and thunder ^ idle electrode is provided between the driving transistor and the source ... the row data line and the driving transistor, ', address transistor. The additional circuit can then be provided in the form of a second address transistor between the second stub and the source of the drive transistor. So = storage capacitor hold-depending on the pixel data input and the second line of data, the source voltage of the gate. The two plus circuit may also include a second storage capacitor, and the first and second storage valleyrs are connected in series between the gate and the source of the driving transistor. In this arrangement-the capacitor is used for the data signal and the other-the capacitor is used for the threshold voltage. The present invention also provides a method for driving an active matrix display device. The active matrix display device includes an array of display pixels in a display area. The element includes-a current-driven light-emitting display element and-㈣ electricity ^ ,, second reading The driving transistor of the display element includes: providing a model circuit for modeling the behavior of a plurality of display pixels outside the display area and including a current-driven light-emitting display element and a __ driving transistor crystal mode circuit; ^ Taken from at least one modeling circuit for a plurality of display pixels, some pixel driving signals, one pixel driving signal; testing the electrical and crystal characteristics of the modeling circuit driving transistor; and responding to measured transistor characteristics Modified for a plurality of display pixel driving signals. ,

O: \ 92 \ 92233.DOC -11-200421221 [Embodiment] The display device widely shown in the present invention includes a display area 30 and a line outside the display 2 and a ττ drive circuit 8. Provided-test Unit 32, == false pixels. These additional pixels outside the display area 32 have been provided for testing purposes and are often referred to as processing control modules or test circuits.素 电路。 Circuit. In all cases, the dummy pixel circuit represents that the actual pixel circuit has similar components and operations to ensure accurate correction. The dummy pixel circuit includes an additional sensing line 40 and a sensing transistor 42 connected between the sensing line 40 and the source of the driving transistor 22. The dummy pixel circuit is subjected to the average driving condition of the representative pixel array (or a portion of the array is driven averagely). Circuit elements 2, 22, 24 shown in FIG. 4 which are dummy pixels used to model the behavior of the pixel circuit in FIG. 2 can be Among the pixels ^ The dummy circuit may include a fixed-ratio form of the pixel circuit. Therefore, the dummy circuit may include a number of pixels connected in parallel so that the circuit behaves the same as the pixel circuit but has a larger current on the same electricity. —The pixel circuit is easy to measure. Another option is that the physical size of the circuit components can be larger, although all circuit components are increased in size by the same factor. The focus is on the driving conditions of the circuit's behavior like the same image condition). The dummy circuit is then used to measure the threshold voltage of the driving transistor. To measure the threshold voltage of the driving transistor, a sensing line 40 is connected to a virtual ground current sensor 50 as shown in FIG. This device tests the current without any change in the voltage on the sense line 40, so that a small current can be sensed. The current sensor controls the operation of a ramp voltage generator 52. The dummy pixel circuit is used to perform the O: \ 92 \ 92233 DOC -12- 200421221 threshold voltage measurement operation at the beginning of each field period of the display. During the rest of the field period, the dummy circuit is driven to a voltage representing the driving conditions of the array pixels. To perform a critical measurement operation, the address transistor 16 and the sensing transistor 42 are turned on. The gate of the driving transistor 22 is discharged to the voltage on the data line 6, and the voltage of the driving transistor is arranged to be smaller than the threshold voltage of the driving transistor 22 to break it. The anode of the LED display element 2 is also held at the voltage of the ground sense line 40. Power runway 26 is now high. The ramp voltage generator 52 then increases the voltage on line 6 in a linear or stepwise manner, for example by increasing the voltage output of the buffer or injecting charge into the line. The gate of the driving transistor 22 follows the row voltage until the driving transistor is switched on, and the current is injected into the sensing line 40 and detected by the current sensor 42. The voltage output of the ramp voltage generator is now stored and used to measure the critical voltage of the driving transistor. During the remaining time of the% guard period, a signal is provided from the data source 54 to the dummy pixel. During this time, the dummy pixel is driven by the average of the remaining display driving conditions. The average of the pixel driving signals can be obtained by digitally averaging digital image materials used to correspond to a plurality of display pixels. Another option is that the average of the pixel driving L number can be obtained by averaging the driving currents supplied to the corresponding display pixels. If so, a circuit is needed to measure the current supplied to the monitor or different parts of the display. The dummy pixel is then driven by the average current value, or it is driven by a fixed ratio of the current depending on the circuit group in the dummy pixel. As mentioned above, there can be a measurement of the threshold voltage in each field period, but there can be more

O: \ 92 \ 92233.DOC -13- 200421221 multiple times. The measured threshold voltage is then applied to the analog or digital data voltage desired for each pixel, such as in the source drive circuit (digital) or in the pixels themselves (analog). The pixel driving signals thus used for a plurality of display pixels are modified in response to the measured critical voltages of the critical voltages of the driving crystals. It should be noted that the driving of the dummy pixels must consider the compensation for the pixels, so that the aging of the driving pixels of the dummy pixels accurately reflects the aging of the corresponding array pixels. FIG. 6 shows a first pixel arrangement that enables a threshold voltage to be applied to a pixel. The first and second capacitors (^ and C2 are connected in series between the gate and the source of the driving transistor 22. The address transistor 16 provides pixel data input to the driving transistor gate. This input charges the first capacitor Ci To the pixel data voltage. The second capacitor C2 is used to store the threshold voltage of the driving transistor (determined by the arrangement of the dummy pixels). The junction between the first and second capacitors is connected to an additional line 60 via the third transistor 62. This line is used to provide the threshold voltage to the pixel. The fourth transistor 64 is connected between the source of the driving transistor 22 and the ground. This is used to drain from the driving transistor without illuminating the display element, especially in the pixel In the programming sequence, the two storage capacitors can include an additional storage capacitor (such as the circuit in Figure 2) or the capacitance of the 5H display element. The transistors 16, 62, and 64 are called k ^ 5 by i. The bucket is connected to the control of each conductor of the gate of the temple. It can be seen in the following that the transistors 62 and 64 can share a -conductor. Only the transistor 22 is driven to select a mine, a finger bucket, and a U battery. , L type. All other thin film transistors in the circuit Field 16,62,64½ private 4.a w 64 are used to open my Bookbag Help for the task of a short cycle

O: \ 92 \ 92233.DOC -14- 200421221 off. Therefore, these devices make the threshold voltage drift small. Figure 7 shows the timing diagram. ~ Remarks 16, 62, 64 in the circuit diagram represent the closed 1 applied to each transistor. Representation 60 represents the voltage applied to the additional line 60. "Data", * ... represents the timing of the data signal on the details. . The hatched area: 2: The time on the data line 6 for other pixel columns. From the second explanation below ;: For other pixel-shaped ㈣ can be applied at this time so that the data is almost even applied to the data line 32 and has a pipeline operation. 、 Bepi is stored on 1 ′ and then stores the threshold 22 gate-source data voltage plus the operation of this circuit is to transfer the data voltage to C2 to drive the critical voltage on the transistor. The operation of this circuit includes the following steps. The address transistor 16 is turned on 'and the third transistor 62 is turned on. At this time, a ground voltage is provided on the line 60 as shown by the marked line 60. In this way, one side of the capacitor Q is grounded and the other side is connected to the data circuit |, so that the data circuit is stored on C1. The address transistor 16 is then turned off to make Ci float. The critical voltage "is then provided on line 60 to charge the second capacitor Q in this way, and the opposite terminal of capacitor c is connected to ground via the fourth transistor 64. Finally, the crystals 62 and 64 are disconnected and the transistor is driven The combined voltage of the two capacitors is applied to their gate-source contacts. Figure 7 shows that the data only has to be on row 6 for a period of time corresponding to the address pulses used for the address transistor 16 columns. Addressing The second half of the phase can overlap the first half of the addressing phase for adjacent columns, making a pipelined address sequence available.

O: \ 92 \ 92233.DOC -15-200421221 The length of this 'address sequence' does not imply long pixel programming time, and the effective line time is only limited by the charge of capacitor Ci when the address transistor is turned on. Take time. This time is the same as that used for a standard active matrix addressing sequence. Figure 8 shows a second pixel arrangement that allows a threshold voltage to be applied to a pixel. The circuit of Fig. 8 is actually the same as the dummy pixel circuit of Fig. 4, but the sensing line 40 is replaced by an additional input line 70 and the sensing transistor 42 is replaced by an additional input transistor 72. The pixel is driven by charging one side of the storage capacitor 24 to the data voltage and charging the other side to a negative voltage equal to the threshold voltage amplitude. Therefore, the total voltage on the storage capacitor is the data voltage plus the voltage: Figure 9 shows the timing of the operation. There are still two phases to addressing time. In the first stage, the input line 72 is grounded, and the capacitor 24 is charged to the data voltage via the address transistor ^. In the second phase, a reverse threshold voltage is provided on line 72. In the above example, the pixel is modified so that a threshold voltage can be applied. This keeps the voltage required on the row conductors within limits when a threshold voltage is applied to the pixel. The threshold voltage can also be added to the pixel driving signal by a capacitive coupling effect, such as adding a voltage to the so-called "4-level driving plan" for the active matrix liquid crystal display. As mentioned above, the correction can compensate for the aging of the pixel circuit components, especially the aging of the Wei Jingdian. The invention < circuit and method also provide compensation for changes in the temperature of the display. The characteristics of the non-crystalline 视 circuit depend on the temperature, and this = the temperature dependence of the pair of dummy pixels can be compensated by placing the dummy pixel circuit in an area subject to similar temperature conditions as the pixels of the display. So that the dummy pixel

O: \ 92 \ 92233.DOC, 16- 200421221 The temperature near the circuit is representative of the temperature of the active pixel area. The only circuits that are used are those using n-type transistors. Many technologies are available, such as silicon, hydrogenated amorphous silicon, polysilicon, and even semiconductive polymers. These are considered to be within the scope of the present invention. The display can be a polymer led device, an organic LED device, a dish-containing material, and other light-emitting structures. There are other ways to apply voltage to the pixel, and many ways to implement the pixel drive ^ change before the line is provided to illuminate traditional pixel designs. The various data processing techniques used to implement data modification in the line driver circuit are not described in detail because they are routine work for those skilled in the art. In the above example, an average illuminance value is used as the basis for the correction signal. Those skilled in this technology will understand the complicated schemes that can be used to determine the correct one. ⑨τ can consider not only the + uniform illumination, but also changes in illumination values or other statistical parameters. A single correction signal can be applied to the entire array. However, the correction can be performed column by column 'or even based on the square area of the pixel array. It all depends on the nature of the data to be displayed on the device. It will be apparent to those skilled in the art that various other modifications are possible. [Brief description of the drawings] The present invention has been described with reference to the attached drawings. In the drawings: FIG. 1 is a known electroluminescence display device; FIG. 2 is a circuit for addressing the current of the electroluminescence display device. A schematic diagram of a known pixel circuit; Figure 3 is a display device of the present invention; Figure 4 is a circuit used in the device of Figure 3;

O: \ 92 \ 92233.DOC • 17- 200421221 Figure 5 is a test circuit related to the circuit of Figure 4; Figure 6 is the first pixel circuit used in the device of Figure 3; Figure 7 is a timing diagram explaining the operation of the circuit of Figure 6 Figure 8 is a second pixel circuit used in the device of Figure 3; and Figure 9 is a timing diagram explaining the operation of the circuit of Figure 8. It should be understood that these drawings are simplified and not drawn to scale. The size and proportion of each part in the figure are clear and convenient, and have been enlarged or reduced. [Illustration of representative symbols of the figure] 1 pixel 2 display element 4, 6 address conductor 8 scan drive circuit 9 data drive circuit 16 address transistor 20 current source 22 drive transistor 24 storage capacitor 26 power track 3 0 display area 3 2 Test unit 40 Sense line 42 Sense transistor-50 Virtual ground current sensor 52 Ramp voltage generator O: \ 92 \ 92233 DOC -18-54 200421221 60 62 64 65 70 72 Four transistor critical voltage additional input line Additional input transistor O: \ 92 \ 92233 DOC -19

Claims (1)

421221 Patent application scope: An active matrix display device including one display pixel array in the display area ⑼), each pixel includes a current-driven light-emitting display element (2) and a current driven through the display element. The driving transistor (22), wherein the device further includes a light-emitting display element (2) for modeling one of the plurality of display pixels outside the display area (30) and having a% current driving, and a driving transistor ( 22) at least one modeling circuit (32), the at least one modeling circuit is provided with one pixel driving signal taken from a plurality of pixel driving signals for a plurality of display pixels, which makes the device further include ... A component (50, 52, 54) for measuring the transistor characteristics of the modelling circuit driving transistor; and for modifying the pixel driving signals for the plurality of display pixels in response to the measured characteristics of the thunder crystal member. 2. The device according to item 1 of the scope of patent application, i ^, where the early modeling circuit is used to model the behavior of all display pixels. 3. ^ Please refer to the first item of the patent application, which is provided with a plurality of modeling circuits, each for modeling the behavior of a subset of the display pixels. 4. If the third item of the scope of the patent application includes a subset of T pixels and no pixels, a row of pixels is displayed. 5. If the patent application scope of the first, second, third, or fourth $ ^^^^ is broken, the pixel driving signal provided to the built-in circuit is taken from (, should be corresponding to the pixel driving signal of a plurality of display pixels 6. If the device in the scope of patent application No. 5 is used, the flat sentence of the pixel driving signal in the em /, will be used to flatten digital image data corresponding to a plurality of display pixels O: \ 92 \ 92233. DOC 8. Both are obtained. For example, if the scope of the patent application is ^ ^ m, the level of the pixel driving signal will be obtained by supplying to the pair.… Set the driving current of several display pixels to be averaged as The patent application scope includes the second display: 3 or 4 devices, in which the modeled electric pixel circuit is in a fixed ratio form. • For devices with patent scope 1, 1, 3, or 4, it also includes providing Use & .¾ to drive the circuit (9) after the voltage of the array is higher than the output voltage, and modify it in the bean to use it. For example, V 7 I /, ^ ,,,,,, and several displays The components of the pixel driving signal of the pixel "text § line driving circuit (9) and the like Output: 1 〇 The device according to the scope of patent application No. 1, M >, 3 or 4, wherein the component for modifying the pixels of a plurality of display pixels is included in the additional circuit of each display pixel Declared the device of the patent No. 10, where each pixel includes a / ^ ~ storage capacitor (22) storage capacitor (24) between the gate and the source and the material line (6) The address transistor ⑽ between the driving transistor (22) and the additional circuit includes a second address transistor between the second row line ⑽ and the source of the driving transistor (22) ( 72). 2: The device of the patent No. 10 of the monthly patent, wherein each pixel includes a first storage capacitor (C1) between the order material line (6) and the driving transistor (22). And an address transistor (16), and wherein the additional circuit includes a first storage valley (C2), the first and second storage capacitors (c) connected in series to the gate of the driving transistor (22) and Between Sources: 3 types of drivers & an array of display pixels in a display area, each O: \ 92 \ 92233.DOC 200421221 The elements each include a current-driven light-emitting display element (2) and an active matrix display device that drives a current through a driving transistor (22) of the display element. The method includes: providing a complex number outside the display area; Model the behavior of each display pixel and include a pen /; IL 'driving at least one modeling circuit (32) for driving the light-emitting display element (2) and a driving transistor (22); Pixels—at least one modeling circuit for one of the pixel driving signals; driving the transistor characteristics of the transistor; and modifying the measured transistor characteristics for the plurality of displays in response to the measured transistor characteristics Pixel driving signals for pixels. 14. The method as claimed in claim 13 wherein the transistor characteristics include the threshold voltage. 15. If the method in the scope of patent application No. 13 or 14 is used, the model in the list is used to model the behavior of all display pixels. 16. If the scope of the patent application is 13 or 14 ^ Λ < Wanfa, which provides a plurality of modular circuits, each of which is used to model the behavior of a subset of the display image Xin Jing. 17. If the patent application range is 13 or 14K, the pixel drive signal provided to the phase% channel is taken from the average of the pixel drive signals corresponding to a plurality of display images. / 18. The method in which the pixel driving signal's display image and pixel digit map I data is added. If the average of the 17th patent application range is averaged, it will be obtained by corresponding multiple averages. 19. According to item 17 of the scope of patent application, the average of the pixel driving signal ° ^ 2 \ 92233.DOC 200421221 is obtained by averaging the supply of ~ .¾¾ to the corresponding plurality of display pixels. 2．If the method of claim 13 or 14 is applied for, the method of “display image to go + you” ^ sigh for a plurality of pixels includes adding a voltage to the pixels to drive the pixels signal. O: \ 92 \ 92233 DOC -4-