TW543019B - Shared pixel electroluminescent display driver - Google Patents

Abstract

An electroluminescent display and driving method is provided wherein the rows of pixels are divided into sub-pixel sets and several different sets of sub-pixels are then addressed from within a larger superset of adjacent sub-pixels. The image data for the addressed sub-pixels is averaged with that for adjacent sub-pixels and is applied to the reduced number of larger sub-pixels in sequence. Consequently, for a given sequence of input frame data sets the time average over one frame for a portion of the sub-pixels at any location of the panel is substantially the same as that for a conventionally addressed sub-pixel in a prior art pane 1.

Description

543019 V. Description of the invention (1) The scope of the invention relates to 'two:':: J off flat panel display '* * more specifically' is the Γ degree of the high display panel: the method of shared addressing, ^ mentioned Interval resolution. 〃% s efficiency 'or improve the surface empty pattern of the faceplate. Brief description of the background fish of the present invention &#; The following detailed description of the specific embodiments of m々 古 一 彳 土 is addressing the pattern with r ® Related, of which: Figure 1 is a dry plan view of the pixel columns and columns on an electro-optical display according to the previous technology.

Fn am 9 π 2 A single pixel cross-section view of each member; Figure 3 疋 Figure 2-Equivalent circuit of the pixel; Figure 4 is one of the pixel-based addressing methods based on Ben Fajun + one of the pixels of the subframe The first specific embodiment is described, 5: The present invention is a second embodiment of the pixel addressing method of the present invention, and the subfield picture frame is a schematic diagram of Xinsou private animal selection; and FIG. 6 is based on this Yu Riyue # w, +, 2 is a second specific embodiment of the method of pixel addressing of the moon and the moon and it is one of the schemes for selecting pixels in the sub-frame. BACKGROUND OF THE INVENTION Electro-optical display is 9 ^, U 疋 depends on their low work related to the cathode-ray tube: electric \ their best shadow and fast response time, see the angle of view on τ σ Gray harmonic ability and finer than electric >} | gg-contour. Electro-hydraulic faceplate As shown in Figures 1 and 2, _Electro-optic display has parallel conductive sites with two intersection groups

543019 V. Description of the invention (2) Address lines, such columns (any two rows of conducting lines of a phosphor film of COL 1, are called column (R0W 1, R0W 2 etc.) and island "2 etc.) One of the pixels that can be arranged at the intersection between the two dielectric films is applied with a voltage. When one is blocked at the same time, the moment is aligned. The required method according to the above is to combine a modulation voltage with Critical electrical voltage. Opening the circuit in any way leaves all the connections to the image per second. Typically, pixel elements are suitable for addressing. 'When they are not high-resolution display end pixels are defined in a row with One point. Therefore, Fig. 2 is a face-to-face view at the intersection of ROW 4 and C0L 4 in Fig. 1. Each pixel is illuminated by the intersection of a column and a column. A modulation voltage of phase f polarity is applied to Each array of two separate columns needs to provide a voltage below a threshold voltage to a voltage on the shelves. These voltages can be summed to provide a total voltage based on the relative sub-pixels, thereby generating a column of images. The other maximum sub-pixel voltage is supplied to the column and The amplitude of the modulation voltage is as much as the difference between the maximum voltages in order to set the pixels according to the desired image. In one case, as long as each column is addressed, the other column can be addressed by the class' until all The unaddressed columns can be addressed at 0. Continued addressing can form a complete picture frame. Typically, a new picture frame y is addressed about 50 times in order to produce a flashless view of the face of the human eye. The energy efficiency can be quite low, with the result that each sub has a relatively high capacitance. When a range of voltage is provided to each column at the same time, the pixels on the remaining columns will be partially charged and addressed, and these pixels will be f Drift. If there are many columns on a display, for example,

543019 _ V. Description of the invention (3) _ = Compared with the energy of the reaction, the non-addressable image content rate of partial charging will be quite low. As the resolution increases, the efficiency will decrease: a reduction of the resistance loss associated with pixel charging Can increase-=-quantity efficiency. This loss can be reduced by reducing the peak value of the component resistance in the charging circuit = "the current situation can be implemented during current charging." Amount: The rate is also improved by recovering a part of the energy stored in the capacitor in j pixels, which is more complicated. * The charging range of the pixel portion on the non-address column is. The Midnight method has been used to improve the efficiency of electro-optic display. 4,847, (309 series of thick sound through a phosphor film " '1 wood block

The description of the dielectric layer capacitance shown in the second and AT two uses of beauty = job 5, 856, 81 3 series describes the time spent in the frame, used to require the same blocking voltage in the column, through, a The voltage on these columns reduces the power consumption of the system. This method: Compare one of the image data of the continuous frame is complicated = Case No. 5,5 1 7,207 discloses the use of a 3 element to drive the electrical waste shown in Figure 2, so that one of these voltage elements can be prime To reduce the power consumption of non-illuminated pixels. A more effective = there is an imager in the US patent case No. 0 9/504, 472 | "Shishi" does not drive e ^ / L ^ H ^ Jiaqi table 'where energy recovery and loss can be minimized. Although The above method is helpful for the improvement of the measurement efficiency, but-the competitive selectivity is provided to the traditional cathode ray tube video display: operation: 543019 5. Invention description (4) The method needs to be further improved. Inventor Confirm the relative energy loss associated with the pixel of this invention. The purpose of the viewpoint is to provide-electricity can increase brightness and energy efficiency, and: ::, dynamic method, line driver, and previous technology department] The system can have an address group of '2 f, and the columns of large pixels are divided into sub-pixel groups or primes and completed in the present invention. The sub-pixels of the addressed sub-pixel = second order are provided to a reduced number of larger sub-locations. '-Part of the sub-pixels-two on the frame; both ,: U first: a traditionally-addressed sub-pixel phase in the art palette:. Sentence: The present analysis and analysis between lighting and energy efficiency. ^ With a defined number of pixels-the display surface is empty, the other and further inventions-further advantages and characteristics can be seen from the following with the drawings, The description of the preferred embodiment is described here. The best embodiment is the description of the 'specific embodiment', the lighting, the type of image displayed, and the quality of the image. The pixel sharing and multi-scanning methods invented above are ideal for use. Colors with a thick thin-film dielectric layer discussed above in Figures 1 and 2 543019 5. Description of the invention (5) Electro-optical display. The thick thin film electro-optical display is different from the traditional thin thin film electro-optical display in that one of the two dielectric layers (refer to FIG. 2) may include a thick thin film layer having a high dielectric constant. Although not shown in Figure 2, since the second dielectric layer does not need to resist a dielectric breakdown (that is, a thick layer can provide this function), the second dielectric layer can actually be thinner than those used in thin-film electro-optical displays. Layers reached. Wu et al. (U.S. Patent No. 5,432,015) describe one method of forming a thick thin film dielectric layer for this display.

Due to the nature of the dielectric layer in the thick thin-film electro-optical display, the equivalent circuit value shown in Figure 3 is substantially different from the thin-film electro-optic display. In particular, the value of Cd is significantly larger than that used for thin-film electro-optical displays. This makes the panel capacitance larger than that used for thin film displays as a function of applying column and column voltages, and further provides a reduction in the relative power consumption of non-addressed columns. Example 1-Dual Line Scan Display

According to a special case of the present invention, a double-column or double-line scanning method can be provided, so that two adjacent columns of a display can be addressed using the same data, thereby reducing the amount of image data to be addressed in an image frame. This means that the number of consecutive addressing steps per frame addressing required for the address display can be reduced, and the frame rate of the result display can be increased. Since the displayed illumination is approximately proportional to the frame rate, the displayed illumination is approximately twice. Two-line scanning can take effect by using one of two methods: progressive scanning and interlaced scanning. The progressive scan method makes use of the same column pairs for each frame. It can be understood that the two-line progressive scanning will cause a loss of resolution. As mentioned above, the image data displayed with each frame of the image is

Page 10 543019 Five 'invention description (6) The amount can be reduced. On the other side:: Intersection = into two different groups. In women's drawings, these pixels show that the even array consists of m and columns; and the even array. As shown in Figure 4, starting with the last two columns (nl) and π, the line pairs Columns 3 and 4 and so on. The numbers are from Column 2 and Column 3 = as shown in the right side of Figure 4. , Column] and column n start at 2 2 5 * temple, until (n_2) and the end of the page and the bottom cause the image data can be addressed out of frame, this will gradually appear :; a simple change on the same display. Yes Ϊ: Why can complex addresses be used for addressing with the skin-driven matrix software? =, Below, other display technologies ^ wrong scanning, and vice versa. = Advanced line scanning can be converted to the invented line scanning method f ^ this 禝The need for miscellaneous electronics, this simple circuit. Because of the &, ^: technology requires fewer components to work on the frame rate-4 8 0 column is not less than 2 60, a field update rate of Hz image It can be seen by double-line scanning using NTSC interlaced shadow comparison without loss of image resolution (Tianren's progressive line scan phase can be divided into the odd-numbered field and each complete column of even-numbered images). Feeling and balance, even figure. The video image can be scanned through the lines of the present invention. The increase in display energy efficiency inherent in the use of one-line two is an alternative to the traditional scanning display and the use of the two-line efficiency of the present invention is determined by comparison between display 1 :; display. Because energy pixels , 22 cm pair ^ ~, so the comparison can be achieved using the two test patterns of 320x240, 7 hair color display. First picture page 11 543019

543019 V. Description of the invention (8) Table 1 Comparison of energy efficiency of half-screen stripe pattern Modulation voltage scanning method Brightness column power column Power efficiency ratio (volts) (cd / m2) (watts) (watts) (lumens / watts) ) 30 single line 12 8.1 10.8 0.62 30 double line 16 10.1 12.8 0.67 1.1 40 single line 27 9.1 17.2 1.04 40 double line 38 12.2 18.5 1.24 1.2 50 single line 43 11.0 24.2 1.23 50 double line 74 16.2 27.0 1.72 1.4 60 single line 56 13.1 33.2 1.22 60 Double line 102 20.0 37.0 1.78 1.5 Table 2 Comparison of energy efficiency of full screen lighting Modulation voltage scanning method Brightness column power bar Power efficiency ratio (volts) (cd / m2) (watts) (watts) (lumens / watts) 30 single lines 8 8.9 9.6 0.42 30 Two-line 8 11.2 10.6 0.34 0.8 40 Single-line 25 12.3 12.9 1.00 40 Two-line 28 17.0 14.8 0.88 0.9 50 Single-line42 42 16.0 17.8 1.22 50 Two-line 56 22.4 20.8 1.29 1.1 60 Single-line 56 19.9 24.7 1.26 60 Two-line 87 29.0 29.5 1.49 1.2 A simplified analysis of the relative energy efficiency of a dual-row scan versus a single-row scan is shown below. If Px is the power consumption of a certain address column and Py is the power consumption of a non-addressed column, then for a single-line scan with one of the n columns displayed

Page 13 543019 V. Description of the invention (9), the entire electric pair of the display and '^ χ / (Ρχ + npv) F = T Jiuyu energy efficiency Es can be passed through the following table, where p is a certain address of the electric ^ '^ Γχ 十 nry) (1) The efficiency of optical energy conversion under the load condition of single-line scanning, and ^ is the efficiency of Satan's electric power transmission to the faceplate using double-line scanning. Such as F-9, the attack rate can be expressed by the following ^ " 2 ^ dPx / (2P χ η λ / where w is the efficiency of the negative χ η y) in the two-line scan (2), and other parameters: Ho In case N, the transmission of electric power to the faceplate is restricted, that is, where ^ is previously defined. F 11 y > px displayed at high resolution, these formulas can be simplified as shown below and s n Px / nPy (3)

Ed ηρ / ηρυ From the viewpoint of the above equation, ^ (4) will be more efficient than single line scanning. ：： 二 丫 2 'Dual-line scanning is less than that, due to 雔 绿 catastrophe' Tian Ran, it should be noted that although the heart is usually not equal, the s-type can be higher in the load of the driver, but the above is quite low? Satisfaction, especially if the driver impedance is the ratio of 11 and ：: can be understood from the above analysis point of view. For non-addressed conditions, the uniform illumination panel (Table 2) is quite low. In this case, the voltages on the barriers are the same, and because of the capacitive coupling of the barriers, the power consumption for the MW array is the smallest. And it should be noted that the luminosity is not significantly higher in the scanning, especially for Lower modulation voltage. The reduced filter means that there is a noticeable voltage on the pixels formed from a voltage drop due to the increased load of the two-line scan. Similarly, the two-line

543019 V. Description of the invention (10) :: The ratio of the efficiency of tracing and single-line scanning is connected-individuals with lower modulation voltage. In fact, it is slightly different from A, for the half-screen stripe pattern (Table 1), and the ancient, power consumption is higher, and relative to the column power ° 'in non-addressed columns, power, and for single-line scanning; ， 5 映 Higher measured higher ratio 'Although the column and the drive drive cry :: know: the measurement efficiency is there, and the electric power transmission efficiency t and β phase. The relative power consumption of an overall higher load column is obliquely increased; in this case, it is greatly reduced. Since it is non-located, increasing the gain is the best for the highest modulation voltage. Efficiency of Line Scanning The test pattern in Table 2 is a table of the energy efficiency improvement of the invention of the dual line scanning method, and it explains the impedance driver of this invention. The dual line scanning ^ i =, 丄 if lower. 9 ▲ Even two or more of the previous descriptions Example 2 Sub-pixel design for common drought Figure 5 illustrates a further and group pixel design of the present invention that can be provided to a full color display. γ example 'of which-three-the actual display pixels of red, green, and blue may be, vertical X specific embodiment, the sub-image selected, taken or addressed in two adjacent columns of other sub-pixels, as described in detail In a specific embodiment, the sub-corner array is used. The number of display pixels at this time is five. The number of sub-pixels of the real red, green, and blue sub-pixels ^ in the super group selected by 纟 ',,, &&; is 3 (— the number of image data pixels described is also θ,' And through each selection group, the person can be a set of three pixels. ^ He is familiar with the art. The shared sub-pixel construction in Figure 5 is a concept of construction through the use of progressive scanning. 543019 V. Description of the invention (11) --- Pixel sharing among R1 and R2, followed by R3 and ^, etc.) Or, as discussed in detail in Figure 6 below, interlaced scanning can be used (that is, in 3 columns ^ And pixel sharing in R2, followed by R2 and "etc.". In order to achieve a frame rate of 50 to 60 Hz in the specific embodiment of Figure 5, the pixel update rate must be 3 times that rate. Video frame can be divided into 3 separate fields displayed continuously. Therefore, in the first field, red (R1 Crl), blue

Cbl), green (Rl Cgl); red (R1 Cr2), blue (R2 Cb3), and green sub-pixel groups (eg, cg3) can be illuminated. In the second field, the sub-pixel groups defined by (R2 Cbl), green (R1 Cgl), red (R2 Cr2); blue (R2 Cb3), green solitary (R ^ g3), red (R2 Cr3), etc. It can be illuminated, and in the second field, it can be illuminated through the sub-pixel group defined by green (R1 Cgl), red (R2 Cr2), and blue (R1 Cb2) $. When the viewer sees it, the eyes can optically average the image frame and appear as a frame that looks similar to a traditional image. , V According to the specific embodiment of FIG. 5, the reduction of the number of sub-pixels by 60% is achieved by two daggers: the number of sub-pixels displayed exclusively by the passive matrix ㈣. A similar reduction is achieved with the number of column drivers with obvious resolution, which can provide one of the cost of display and any device cost associated with display (such as TV products). Substantial reduction of shared sub-pixel design with dual-row scanning. The two technologies described in Examples 1 and 2 can be combined as shown in FIG. 6 to generate ::: faceplate display improvement in brightness and energy efficiency, and reduce costs. In the specific embodiment described above, the number of pixels in the super group selected from the sub-pixel group is 7, and the number of pixels is 7. The number of sub-pixels in a selected pixel group

Page 16 543019 V. Description of the invention (12) Li 3 (—Red, Green, and Blue] = Example 1 shared / a group of pixel design is to make / double-line diagram scan tool 2 — ' In the specific embodiment of FIG. 6, the interlaced scanning can be used instead of the progressive broom. The 30 Hz input video frame rate of standard NTSC images can be divided into 6 different fields: the 3 that can be displayed continuously are even numbers Picture field and 3 odd picture fields. As discussed above, these 6 picture fields can be optically averaged through the human eye to form a picture frame of NTSC data. Although multiple specific embodiments of the present invention have been described herein, However, through the technology in the art, it can be understood that many changes can be achieved without departing from the spirit of the present invention or the scope of the patent application in the appendix.

Page 17 543019 Schematic description

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Claims (1)

Case No. 90100736 > March-Amendment-flf Special Enclosing Method 1. A method for driving a passive matrix display with a plurality of addressable columns and columns, a continuous frame of image data can be applied to the display, Moreover, the columns can be cross-cut to form a plurality of sub-pixels. When they are grouped into a group, a pixel can be formed. The improvement includes continuous simultaneous addressing of the columns to select a fixed number of the pixels forming the pixel. A unique group of sub-pixels, the selection is made for each sub-frame of a set of sub-frames within a frame of the image data, and is made from a super group of one of the sub-pixels near the pixel, The time average of the image data on the frame is provided to each of the groups of sub-pixels according to the way of a video image to be displayed on the frame. 2. For the method of applying for the first item of the patent scope, wherein the improvement has two groups of 6 sub-pixels, each of which is defined by the intersection of three fixed adjacent bars and two selected adjacent columns, where the columns can be based on one Progressive format selection. 3. For the method of applying for the first item of the patent scope, the improvement has two groups of 6 sub-pixels, each of which is defined by the intersection of three fixed adjacent columns and two selected adjacent columns, where the columns can be The interleaved format is selected so that the columns can be alternately aggregated into odd and even arrays. 4. The method according to item 1 of the patent application scope, wherein the improvement has a set of three groups of three sub-pixels in three groups to expand two columns selected from five adjacent sub-pixels of a super group, of which Each group has a common sub-pixel. 5. The method according to item 2 or 3 of the scope of patent application, wherein the sub-pixels of each group are composed of two red, two green, and two blue sub-pixels displayed in full color. 6. The method of claim 4 in the scope of patent application, in which 3 sub-images of each group O: \ 68 \ 68543.ptc Page 19 _ Rain? L No. 90100736_ March 31st of the Year of the Rabbit Amendment_ ^ Sixth, the scope of patent application The element is composed of a red, green, and blue pixels with a full color display. 7. The method of claim 1 in the scope of patent application, wherein the improvement has a configuration of six subgroups of three subpixels as a group of three subpixels, and the two columns extended are 7 phases from a supergroup extended to three columns. Adjacent sub-pixel selection, where each group has a common sub-pixel. 8. The method according to item 7 of the patent application range, wherein the three sub-pixels of each group are composed of a red, green, and blue sub-pixel of a full color display. O: \ 68 \ 68543.ptc Page 20