JP2003532148A - Power saving LCD drive system - Google Patents

Abstract

(57) [Summary] A method of driving a passive liquid crystal display device at a lower power level than that of a conventional driving method will be described. A modified amplitude selection scheme is used, where multiple row scan orders are utilized to calculate display operating states that display the same information with low power requirements. Using the row scan order, the display is scanned by sequentially cycling through the plurality of orders and selecting one of the resulting sequences that results in reduced power. The present invention describes a method and apparatus for scanning, cycling, and triggering a scanning display to find a power saving state. Other embodiments include a fixed, non-sequential row scan order. The present invention has the further advantage of being compatible with the conventional passive liquid crystal display unit and extending the convenience of the passive liquid crystal display unit.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to methods of displaying information on liquid crystal display devices. The present invention further relates to a method for appropriately selecting the scanning order for reducing the power requirement of the passive liquid crystal display device.

[0002]

[Prior art]

Liquid crystal display devices are used in various devices such as mobile phones, pagers, and personal information equipment devices. Since many of these display devices are used in portable battery-powered devices, power saving is an important display attribute. Many prior art systems, such as LCD displays, are equipped with circuitry to power the display through matrix electrodes having overlapping regions forming pixels. The displayed information is
Converted to row address and column data signals according to one of various techniques. These techniques work within the physical limits and specifications of LCD materials by outputting the appropriate signals to the display electrodes.

Typical for use in passive LCD displays is a multiplexing technique based on the principle that the optical properties of the display respond to an average or RMS signal. Al
A common implementation of this technique, such as the to-Pleshko technique, uses row signals to select rows to receive information and column signals as data signals that carry the information to be presented. Variations of the above techniques have been developed for the purpose of driving display devices using AC, limiting DC damage to the liquid crystal, and maintaining the applied voltage within a certain range.
This variant of the display technology is illustrated by the improved Alt and Pleshko technique (IAPT). In addition to the IAPT approach to the control display device, frame rate modulation (FRM) that produces density by multiple scanning of the display device and multiple line addressing (MLA) that simultaneously scans multiple lines are performed. There are many other techniques for performing such a display. In particular, the prior art technique involves progressive scanning of rows from one edge of the display to the other,
It limits scanning to a certain set pattern that is not strictly necessary for multiplexing.

Reducing power requirements, and thus allowing, for example, extended battery life in portable devices, has long been a goal of LCD display development. Among the approaches that have been attempted to reduce power requirements are the development of new crystal applications, the incorporation of more sophisticated electronics into displays, and the computation of centralized display driver algorithms such as MLA techniques. There is development. The present invention utilizes a simple driving algorithm and introduces a new, low power LCD panel addressing scheme that is compatible with existing liquid crystal materials and LCD manufacturing techniques.

[0005]

[Problems to be Solved by the Invention]

The present invention aims to reduce the driving power requirements of LCD displays by providing a method and apparatus for scanning a display. In the display driving technique developed by the prior art, the display is driven with a fixed progressive row scan pattern.
Row-by-row scanning, but another possible scanning pattern that could have lower power requirements was not utilized. The present invention allows for a reduction in power requirements compared to the power requirements obtained using prior art scanning techniques by changing the scan order to find lower power requirements.

In one embodiment, the display device responds to input data by selecting or calculating a scan order with a lower power requirement. In another implementation, the scan order is fixed in a non-sequential order to provide an overall lower power requirement. In yet another embodiment, the display logic drives the display using a plurality of scan orders,
The display value of the display power is measured, the optimum order is selected, and the display device is driven in the optimum order. In another embodiment, there is the step of triggering the display logic element based on a measured power change, a measured display input signal change, or a fixed time interval, thereby further comprising: Low power requirements are constantly being pursued by the display logic.

Accordingly, the present invention enables the provision of a scan order that is not utilized in the prior art to reduce the power requirements of display devices. The provision of this scanning order allows reduction of power consumption by adding some circuit configuration or programming of components, and is compatible with current liquid crystal display devices.

[0008]

[Means for Solving the Problems]

It is an advantage of the present invention to provide a new method and device for use in a liquid crystal display device, and to configure the display device to operate for a longer time with a given amount of energy.

It is another advantage of the present invention to provide a new method and apparatus that provides a row scanning order associated with a multiplexing technique for reducing the power requirements of a display device.

It is a further advantage of the present invention to provide a new method and apparatus that seeks to reduce the display power requirements of LCD displays by appropriately modifying the row scan order.

It is yet another advantage of the present invention to provide a new method and device that is compatible with current liquid crystal display devices.

It is an advantage of the present invention to provide a new method and apparatus that provides a row scan order for scanning a display device while skipping one or more pixel rows.

[0013]   It is an advantage of the present invention to provide multiple row scan orders for driving a display device.

It is another advantage of the present invention to provide a new method and apparatus for selecting a row scan order for driving a display device based on a display input signal.

It is an advantage of the present invention to provide a new method and apparatus for controlling the display power of a display device that measures the figure of merit indicating the power required to drive the display device.

It is yet another advantage of the present invention to provide a new method and apparatus that is simple to manufacture, inexpensive and easy to use.

Additional objects, advantages and novel features of the present invention will be mentioned in part in the following description. These features will also become partially apparent to those of ordinary skill in the art upon reviewing the following description, which may be learned by practice of the present invention. The above objects and advantages of the invention may be realized and attained by means of the combination with the means as recited in the appended claims.

A further understanding of the invention can be obtained from the detailed description of specific embodiments that follow. For clarity, the following discussion refers to apparatus, methods and concepts with specific examples. However, the method of the present invention can work with various types of devices. Moreover, it is well known in the art that a logical system can comprise a wide variety of different hardware and programmable components and different functions in a modular fashion. Various implementations of the system may include various mixtures of elements and functions, and may group various functions as part of various elements.

For purposes of clarity, the present invention is described in terms of a system that includes many different innovative components and innovative combinations of components. The invention is not limited to combinations containing all of the innovative component lists listed in any of the exemplary embodiments herein.

All documents, patents, and patent applications cited herein are incorporated herein by reference in their entirety for all purposes.

Reference symbols in the figures are used to indicate certain components, aspects or features shown in the figures, and reference signs common to more than one figure show the same elements, aspects or features shown in the figures. I shall. Reference signs used herein should not be confused with any reference signs used in the literature items incorporated by reference herein.

[0022]

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides improved methods and apparatus for driving and outputting drive signals for liquid crystal display devices. Display technologies with which the present invention is concerned include passive LCDs, active LCDs, electroluminescent and plasma display devices,
The display technology is not limited to these display devices. The method and apparatus of the present invention may be used to reduce the power requirements of a display device over prior art techniques. Make these power requirements the lowest possible requirement, or
As a compromise to design considerations, the present invention can either be configured to display information with significantly lower power requirements than prior art systems. However, it is not absolutely necessary to display the lowest power.

Since the present invention is directed to a drive circuit for an image producing display device, prior to discussing a further novel aspect of the present invention, the physical layout of a display device such as the image producing display device described above. It is instructive to describe the power requirements, and in particular the circuitry and methods of driving the display to reduce their power consumption.

LCD Layout FIG. 1 shows a prior art physical layout of a passive liquid crystal display device, particularly with respect to the physical layout of the display device and its response to input signals.
1 is a general representation of the type of display device covered by the present invention. The description of FIG. 1 is directed to the display technology according to the prior art, but is not intended to limit the scope of the present invention, and is a description of the configuration and operation of the prior art LCD related to the present invention. Is intended to do. FIG. 1 is a plan view showing a liquid crystal display device 101 together with a display control circuit configuration including a column driver 103 and a row driver 105. The display device 101 includes a set of M column electrodes 111 and a set of N row electrodes 109 arranged on the opposite side in the thickness direction of the display device. Row electrode 10
9 is numbered consecutively from one side of the display to the other, from 1 to N,
The column electrodes 111 are similarly numbered from 1 to M. The column electrode 111 receives M column data signals 115 from the column driver 103, while the row electrode 1 receives the M column data signals 115.
09 receives N row addressing signals 107 from the row driver 105. Display device 101 has a material that is optically detectably responsive to a potential difference across the display device in association with associated components not shown. Therefore, N × M arrays of individual pixels 113 formed by overlapping electrodes are optically switched on / off to apply a voltage to electrodes 109 and 111 on the opposite side of display device 101. An image is produced by applying the voltage. The electrodes 109 and 111 are arranged such that each pixel 113 is associated with a combination of two electrodes.

General Display Driving Considerations Passive LCDs are adapted to respond to temporally averaged or RMS signals applied across individual pixels. An image is produced on the display by "scanning" across the image by sending appropriate signals to the display. Therefore, image scanning is performed by applying row and column signals that produce the optical response required for image generation by optical manipulation of individual pixels. Each row addressing signal 107 and column data signal 115 scans the display while varying with time and produces an image using the time varying signals. These two sets of time varying signals then produce the desired voltage difference at the pixels that intersect across the electrode plate. The voltage difference at this pixel modulates the orientation of the liquid crystal molecules, which in turn modulate the incident light, producing reflections or transmissions of various shades. These pixels are then recombined by the human eye to produce an image.

Without limiting the invention, one general method of producing the required RMS voltage difference at each pixel is to use a row addressing signal with amplitude used to "select" individual rows. One of the pixels in the selected row is "on" or "off" based on the appropriate optical response to the applied voltage during sequential application.
A column data signal with an amplitude used to indicate is simultaneously applied. Thus, the row signal contains scan order information, while the column signal contains data information for the selected row. The row and column signals each vary with time, each row is typically selected once each time the display is scanned, and the RMS voltage across each pixel is optically selected to produce an image according to the display technique. It is driven to a certain value needed to produce responsiveness. In this way, information is transmitted to the display device by scanning the display device in chronological order on the selected row. The column data signals are timed to correspond to the row times, producing the required voltage difference at the intersections of the matrix electrodes. Especially in the case of the present invention, it is useful to consider that the time order of the selected rows is such that it is given by a row scanning order that can be selected, modified and controlled. The driving of the display device according to various row scanning orders affects the display power, and further,
It will be shown below that a row scanning sequence that can be changed and controlled can be used to reduce display power.

Power Requirements for Display The power required to drive an LCD display is the sum of the power required to drive the matrix electrodes using row address and column data signals. Outputting information to the display device one or more lines at a time is a feature of many prior art techniques. The row address signals signal one or more individual rows, while the column data signals provide the output of data associated with the pixels corresponding to the selected row. The power consumption when driving the row LCD electrodes or the column LCD electrodes is directly proportional to CfV ² . Where C
Is the load capacitance, f is the toggle count, and V is the swing voltage. However, the swing voltage with respect to any one of the specific electrodes is a value obtained by subtracting the minimum voltage from the maximum voltage applied to the electrode while a certain image is displayed. Predetermined LC
For the D design, both C and V are constant. Thus, the indication of power driving any particular row or column is such that the voltage on that line changes polarity ("toggle").
) Correlation with frequency. Since each row is scanned exactly once per frame, the row power requirement for row scanning is constant. Since the column toggle rate depends on the row scanning order, a change in the row scanning order that provides a method for reducing power consumption will be described later.

[0028] More simply, the power requirement (PCOI) of the column driver is the pixel charge (Q).
, Capacitance (C), voltage (V) and average column toggle frequency (f),
It is expressed by the following formula. P _col = (N · M) QVf = (N · M) CV ² f Typical values of pixel capacitance and voltage are 2-4 pF and 2-3 V, respectively.
And the number of pixels (N × M) is constant for a given display device, where N and M are in the range 30-500. Therefore, the total power consumption for a given display unit will be proportional to the average column toggle rate f. The toggle rate is calculated both by the image being displayed and the order in which the rows of the LCD display are scanned. Effectively, the image pattern and row scan order control the column toggle frequency, which is directly proportional to the display power. Therefore, as described above, it is possible to provide the method of reducing the display power by the row scanning order.

Power Saving Demonstration for Display Due to Modified Row Scanning Order The variation in power requirements during image display is significant, as evidenced by the signals used for checkerboard display. there is a possibility. In this case, each pixel has an opposite on / off state with each of its immediate neighbors. FIG. 2 shows a checkerboard pattern displayed using a conventional sequential row-scan pattern, but the checkerboard pattern consumes a large amount of power, especially due to the alternating column signals required for pattern generation using the sequential row-scan sequence. Will have requirements. FIG. 2 shows a signal diagram for a passive liquid crystal display device, where the combination of selected row addressing and column data column signals is suitable for display devices with N = 4 rows and M = 4 columns. Information is presented at various matrix positions. In general, a display device may have many rows and columns, and it is not uncommon to have hundreds of rows and columns each. The row addressing signal 107 is labeled VR _i (i is a row designating number), and the column data signal 115 is labeled VC _j (j is a column designating number).

The row addressing signal 107 and the column data signal 115 vary with time and are synchronized to send display information to each pixel on the display. This display information is a fixed checkerboard pattern in the example shown in FIG. These matrix electrodes are on opposite sides of the display device 101, resulting in a voltage across each pixel. The voltage difference between the row signal and a column signal (V _ij = VR _i -VC _j, where the subscript ij denotes the i-th row and j th pixel) is. In this way, the display information is sent to each pixel in this scanning technique by selecting one row at a time while sending a display signal to all columns and to each pixel in that row. To maintain zero average voltage, the IAPT scans the display in two fields per frame using a signal with alternating polarity for alternating fields. By the row address signal 107,
While row addressing is done sequentially (in this case rows 1 to 4 as can be seen in FIG. 2), the column data signal 115 contains information about the display image and the addressed row. . In frame 1 of FIG. 2, the S volt row addressing signal indicates that a row has been selected, the 0 volt signal indicates that the row has not been selected, while the D volt column data signal indicates An "off" pixel is indicated and a -D volt column data signal indicates an "on" pixel. The frame 2 voltage is inverted from the frame 1 voltage so that the average voltage of the two frames is approximately zero. The voltage difference produced by the row and column signals is a typical "on" pixel 201 (V14).
And as a time-varying signal for the "off" pixel 203 (V24) is shown on the right side of FIG. For the particular passive LCD shown in this figure, the on-state average voltage will be greater than the off-state average voltage.

The checkerboard pattern is one of the maximum power consumption patterns in a progressive row scanning order with scanning from one end of the display to the other. Therefore, the checkerboard display power improvement is a suitable display showing the magnitude of the power savings that can be obtained using the present invention. For the checkerboard pattern using the progressive scanning technique of FIG. 2 (row order 1, 2, 3, 4), the power requirement per frame is given by the 4 row toggle and the 16 column toggle.

The improvement in display power is apparent when one considers the reduced column frequency utilizing the optimized row scan order. FIG. 3 shows a row addressing signal 303, which is implemented in the same physical display device 101 and uses the same pixel layout and checkerboard pattern as in FIG. Scan the image according to 3, 2, 4. The signals of a typical "on" pixel 305 and "off" pixel 307 are also shown in this FIG. The average voltage in each case is the same as for the typical prior art pixel of FIG. However, when utilizing the scanning technique of the present invention, the checkerboard pattern requires that each frame have a 4 row toggle and a 4 column toggle. Thus, although the present invention produces the same pattern as the prior art technique with the same number of row toggles, it can be seen that the number of column toggles is only one quarter that of the prior art. According to the invention, the power consumed by the column driver is reduced in this example to 1/4 of the power consumption of the prior art.

The power savings illustrated herein are not limited to the addressing scheme illustrated in FIG. Other schemes, including multiple line addressing schemes (MLA), also benefit from the present invention. In the present invention, the scanning order is checked and the scanning order is selected so that the power consumed by the display device is minimized. Another application of the invention is in gray shade modulation systems involving the use of frame rate modulation. When this frame rate modulation is utilized, each frame consists of an integer that represents a field and is scanned to produce a density at each pixel location.
For such applications, an implementation similar to the applications described herein will be utilized. In that case, each scan order of the rows is held long enough (at least twice as long) to be able to scan through each field of the frame, thereby allowing all frame scans utilizing both polarities. Become.

Moreover, the row scan order described in connection with FIG. 3 is only one of many row scan orders that can result in display power savings. Other orders of interest include a row-scanning order for scanning display rows by combining the order of skipping multiple rows, and a pseudo-random row sequence (but not limited to these sequences). Not what is done). Generate these and other sequences,
A method and apparatus for reducing the power by appropriately changing the row scanning order and other problems associated with the implementation of the present invention will be discussed later. In addition, flat panel
Similar power savings may be achieved using display technology. In this flat panel display technology, an array of pixels is scanned to produce an image, and the column drivers experience significant power dissipation due to the capacitive loading present on the column electrodes of the particular display architecture. Examples of such display devices include AC plasma display panels and thin film EL-based display panels. Therefore, the methods described herein are generally applicable to driving a wide variety of display devices.

Examples The discussion so far has shown that a change in the row scan order of a multiplexed display can significantly reduce the power requirements of the display. Using this concept,
A detailed description of some embodiments of the method and apparatus of the present invention will be provided. First, we present an embodiment of a display driver that is capable of producing all of the advantages of the invention. This embodiment is followed by information display with reduced display power, or some embodiments available for information display.

In a first embodiment, the predetermined information is incorporated into a look-up table to generate an optimal order of predetermined display input signals. In a second embodiment, a predictive value is generated in the display driver that indicates which of several available row scan orders is optimal, and then that optimal order is utilized. In both the first and second embodiments, the images are generated in a known or predicted optimal order, which results in a significant saving of display power. In another embodiment, several row scan orders are cycled sequentially, each of which is used to generate an image, the display of power for display is measured, and then the order of lower power operation is selected. To be done. In particular, some row scan orders are checked as the lowest possible power order, and then the "optimal" order is used to drive the display. The circuitry of the display device is capable of generating various row scan orders either through hardware or software. These orders determine the scanning order of the rows of the image. Figure of Power showing display power for each of the possible row scan orders.
The merit (FOM) is measured and calculated. As a result of the change in the scanning order of the rows, the display power changes as described above, and as a result, the FOM changes. The figures of merit are compared, and the row scanning order corresponding to the figures of merit satisfying a certain criterion is selected to drive the display device. This figure of merit may be either a measurement value taken from the display device, a display driver, or one obtained from a calculation result based on the image pattern attribute before the generation of the image display. In these alternative embodiments, it is desirable that the scan order of each row be maintained long enough (2x or more) to scan the image, thereby allowing accurate figure-of-merit measurements.

When sequentially cycling through several row scan orders, it is expected that some non-optimal order will drive the display device, resulting in increased power consumption. Therefore, it is desirable to limit the order selection frequency. To do this, in a third embodiment it is possible to perform cyclic triggering at set time intervals. The fourth embodiment is triggered by a change in the display input signal, and is triggered by a change in the display power indicator in the fifth embodiment. In a sixth embodiment, the row scan order is calculated to have a suitably reduced power, and a predetermined row scan order is used that is presumably selected for certain intended applications.

For clarity, this description refers to apparatus, methods and concepts for specific examples. However, the method of the present invention is capable of working with various types of devices. Moreover, it is well known in the art that a logical system can comprise a wide variety of different hardware, programmable components, and different functions in a modular fashion. Various mixes and functionality of elements may be included in various implementations of the system, and various functions may be grouped as part of various elements. It is understood that the examples and embodiments described herein are for purposes of illustration only, and that various modifications or variations of the examples and embodiments described above are within the spirit and scope of the present application and the appended claims. It is to be understood that within the scope of the section, it is suggested to one skilled in the art.

Display Driver Implementation It is possible to achieve the advantages of the present invention with a display driver that has the ability to generate images in a specified row scan order. Although information can be displayed by another method as described above, FIG. 4 shows one of the embodiments as described above. In particular, the display device 101
Receives the display input signal 431, and the display input signal 431 is stored in the display data RAM 403. All references to display device 101 include display devices of that type described elsewhere in the specification, claims and drawings, as well as non-sequential or varying row scan order, power saving. Should be understood to include any other type of display device that operates at. The display input signal 431 may be composed of bit map information to be displayed. Alternatively, it may consist of a string of characters or some other higher level display that is converted into bit mapped display data, containing multiple layers of information for a color display. The display data 431 is stored in the display data RAM 403, held therein, and finally the column data signal 413 is generated.

The scanning order generation device 437 controls the scanning order by generating the row scanning order 433. A decoder 407, which produces a plurality of signals corresponding to each row, outputs a row addressing signal 411 using a row scanning order 433, and each row is amplified by a row driver 409 to produce an addressing signal. . The row scanning order 433 also corresponds to the order of reading display information from the display data RAM 403, and the row scanning order 433 is also used to generate the corresponding column data signal 413. More specifically, the row scanning order 433 is converted by the RAM address generation device 401 to obtain the data R
AM address is displayed. These addresses correspond to the row and column addresses of the display information stored in the display data RAM 403. As described above, by using the row scanning order 433, the generation of the row address signal 411 and the instruction of generating the appropriate address signal for reading from the data RAM 403 are simultaneously issued to the RAM address generation device 401. Row and column drivers 409 and 413
Of the CMOS implementation consists of typical CMOS logic elements, multiplexers, demultiplexers, counters, level shifters and output driver stages, all of which are well known to those skilled in the art of mixed mode CMOS circuit design.

The use of a scan order generator or another component that allows a scan order that differs from the conventional row scan order allows for non-sequential ordering or switching between multiple orders that reduces display power. Become. The display input signal 431 can be displayed on the LCD 101 using the designated row scanning order by an instruction by the input to the order generation device 437 to generate one of the plurality of row scanning orders 433. Since the display power depending on the row scanning order 433 is shown, the input to the sequence generator 437 can be used to modify or change the display power.

In the scanning order according to the related art, since the pixel rows of the display device 101 are sequentially scanned, this scanning order can be represented by the order {1, 2, ..., N}. Each row is then progressively scanned from row 1 to N across the display. As previously mentioned, optimizing the row scan order allows for a significant reduction in the power consumed by the display device. For example, for a display device as small as 100 pixel lines, the order {1, 3, 5, ...} that precedes {2, 4, 6, ...} causes the power consumed by the column driver to be reduced. It can be reduced by several digits. As another important order, the order of skipping two lines indicated by {1, 4, 7, ...} that precedes {2, 5, 8, ...} that precedes {3, 6, 9, ...}, There are pseudo-random orders and rows and other orders that skip non-sequential orders. All of these orders are included within the scope of the invention. Another important aspect of the invention is the ability to change between row scan orders and the ability to power the display using only one of the orders. Some of the many methods and techniques for generating these sequences include adders with selectable preloads and programmable increment values, which are generally known to those skilled in the art of logic circuit design, and pseudorandom. Includes bit swapping counter bit order to generate order and another pseudo-random order generator technique.

In some embodiments of the present invention, the display value of the power consumed by the display in association with the control logic is used to calculate the optimum row scan order. The display value of the power consumed by the display device is the figure of merit 435, and this figure of merit 435 is calculated by the figure of merit measurement 415. There are many ways to create a figure of merit for the minimization of display power, and some alternative techniques are shown as dashed lines in FIG. Various figure-of-merit measurement techniques are not meant to limit the scope or intent of the present invention. There are also other techniques for measuring or obtaining an indication of the approximate power consumed by the display device 101. As mentioned above, the power consumption of the row driver is approximately constant during various row scanning orders. This is because each row receives power the same number of times. Some methods of performing figure of merit calculations based on the power requirements of the column driver 413 are shown in FIG. In another implementation, some combination of row and column power can be a useful indicator of power consumption. As a direct way to generate a figure of merit measurement of column power, meter 417 is used to directly monitor the power or current requirement of column driver 405, and then column power or current measurement 423.
Is used to generate a signal proportional to the power or current. Apart from the above, the power of the column driver 405 is controlled through the charge pump 421 and the regulator 419. The charge pump counter 425 provides another way of measuring figure of merit. Yet another method of measuring the figure of merit is to monitor the column signal via the toggle counter 427. The toggle counter 427 displays the frequency at which the column data signal 413 is toggled.

First Embodiment: Selection of Row Scanning Order Based on Lookup Tables FIGS. 5 and 6 are a first embodiment of the lookup embodiment of the present invention. Figure 5
Of the plurality of row addressing signals 41 generated from the display input signal 431.
A display logic element for driving the display device 101 using 1 and the column data signal 413 is provided. In detail, the display logic element of this embodiment includes a lookup table 501, a scan order generation device 437, a RAM address generation device 401, a display data RAM 403, a decoder 407, a row driver 409, and a column driver 405. To do. The display input 415 may consist of the displayed bit map information. Alternatively, it may consist of a string of characters, or some other higher level symbol that is converted to bit-mapped display data, that contains multiple layers of information for a color display. Good. Information related to the display input signal 431 is stored and held in the display data RAM 403 and is finally used when the column data signal 413 is generated. Further, the display input signal 431 is output to the look-up table 501. With the look-up table 501, the minimum power used at the time of generating the input signal image to be displayed on the display device 101 or some other optimum power. The "best" order is calculated. The details of the look-up table 501 depend on the type and number of different displays for which it is intended. Thus, for example, the optimally selected row scan order may differ between alphanumeric patterns, image patterns, blank displays, or gaming display patterns. The look-up table 501 further includes, for example, which line scan order is best for a given menu to be displayed, or which line scan order is best for a combination of letters and numbers. It may include unique information. The information in look-up table 501 is based on predicted values calculated using certain algorithms, or based on statistical analysis that calculated the optimum row scan order for a class of input signals for display. It is possible to either calculate with measurements made on a similar display unit or to calculate the above information by some other technique.

The lookup table 501 communicates with the scan order generator 437 by indicating which order should be generated. In one embodiment, the look-up table 501 and the scan order generator 437 include a shorthand expression that includes an index that indicates which of several preset orders the scan order generator 437 should generate. Use to communicate. For example, if it is predetermined that only three scan orders will be used for all of the images, then three orders can be represented by an index that can take the values 1, 2, or 3. The lookup table 501 then analyzes the display input signal 431 to look up the index corresponding to the optimal order (index of the optimal order) and passes the index onto the order generator 437. An optimal order corresponding to the optimal order index is then generated. In another embodiment, the look-up table and the scan order generator are configured in a single unit that directly generates the order in response to an input, thus eliminating the use of indexes. You can also do it.

Decoder 407 produces a row addressing signal 411 using the row scan order.
In synchronization with the row addressing signal 411, and in accordance with the row addressing signal 411, some other component is functional, for example, as described above in connection with the signaling scheme of FIG. 413 is created. In particular, RAM address generator 401 uses a row scan order to generate a display RAM address corresponding to each addressed row, each addressed row being bit mapped. Produce appropriate display target information. This information is stored in the column driver 40.
5, and the column driver 405 generates the column data signal 413.
In this way, the display input signal 431 is interpreted, and the optimum row scanning order is generated. Rows and columns are driven using this optimum row scanning order, and image generation is performed using power saving requirements.

FIG. 6 presents a flowchart of the first embodiment. The functions of the decoder 407, row driver 409, RAM address generator 401, display data RAM 403, and column driver 405 are represented by the decoder / driver function block 605 in FIG. The functions of look-up table 501 and scan order generator 437 are represented by blocks 601 and 603, respectively. In the flowchart of FIG. 6,
The flow of information from the display input signal 431 to the display device 101 is emphasized. Further, the use of a display input signal for generating the driving order of the display device is particularly pointed out.

Second Embodiment: Predicting Power Requirements Before Image Display Using Available Row Scan Order FIGS. 7 and 8 show screen display using a row scan order calculated to perform a power saving display operation. 2 shows a second embodiment for performing. As mentioned above, changing the row scan order changes the display power and therefore the FOM. A second embodiment of the present invention includes sequential cycling of available sequences, prediction of power requirements by a figure of merit of power for display, and selection of sequences based on this predicted power. Calculation of the optimal row scan order by driving the display device using only order is included. Thus, the row scan order is selected from among a plurality of row scan orders using circuitry to predict power requirements while driving the display device in the selected order. The similarity between the second and the first embodiment facilitates the present description. In detail, FIGS. 6 and 7 show the first
And a flow chart of the second embodiment. Lookup of the first embodiment
The function of the table 601 is that the row order ID, that is, the index
Passing to 3 replaces a series of steps that sequentially cycle through a set of S row scan orders. The lookup table 601 of the first embodiment is the decoder 70
1, the figure of merit prediction device 703, the trigger circuit 705, the order selection device 707, and the order generation device 709. When receiving the information from the display input signal 431 and the currently selected row scan order from the order generator 709, the decoder 701 is a column indicating the signal to be sent to the column electrodes of the display. A signal proportional to the address signal is reproduced, approaches the signal, or otherwise generates the signal. The output of decoder 701 is utilized by figure of merit predictor 703 to predict figure of merit by techniques including any of the techniques described above, while the output of decoder 701 is It is not limited. If there is a significant change in the calculated figure of merit due to a change in either the value change or the change associated with the preset trigger level, a signal is sent to the order selector 707. The order selector 707 then sequentially cycles through each of the S row scan orders to obtain an order index,
Both the corresponding figures of merit are accumulated. After the sequential cycling of this sequence, the sequence selection device 707 selects the sequence with the figure of merit corresponding to the minimum power, and this sequence becomes the selected sequence.

FIG. 8 is a block diagram combining the hardware layout and flowchart of the second embodiment of the present invention, in which the row scanning order is calculated before image generation. As in the first embodiment, the display device 101 is driven using the display input signal 431 and the selected row scanning order. The selected row scanning order is the display data RAM 801, the column driver 803, the figure of merit prediction device 805, and the figure of merit drive trigger 8.
07, the row scan order generator 809, the scan order generator 811, and the RAM address generator 813. Each of the components 801 to 813 reproduces the function of the counter part of the component that generates the display signal, but the component may be a different circuit. This is because the above components produce the displayed image and are therefore not utilized to operate at lower current levels. Alternatively, due to the presence of functional overlap, some of the components having similar functions may be combined together to serve two purposes.

Starting with a preselected row scanning order and corresponding RAM addresses, the display data RAM 801 receives display target information via the circuit configuration described in the description of FIG. 4, and the column driver 803 and figure Of Merit Prediction Device 805
Figure of Merit Measurement Techniques for calculating predicted figure of merit. If the predicted figure of merit exceeds a certain predetermined threshold or change by the figure of merit driven trigger 807, then order selection to cycle through the available row scan orders. Device 809 is triggered. Also, the order selection device 809 constantly pays attention to each predicted figure of merit of the row scanning order, selects the row scanning order, and passes an appropriate order ID to the scanning order generation device 437. By separating the figure-of-merit calculation from the drive of the display device, it is possible in this embodiment to select the row scanning order prior to the image display. One useful figure-of-merit predictor for this embodiment is the average column toggle frequency set by analysis of the column data signal prior to image display. Apart from the above,
Circuits that provide the functionality of blocks 811, 813, 801, 803 by the corresponding counter part circuits 437, 401, 403, 405 of the blocks, with the penalty of increased power due to the sequential cycling of the unoptimized row scan order. It is possible to reduce the complexity of the.

Third Embodiment: Selection of Row Scanning Order Using Measured Figure of Merit Triggered at Set Time Intervals The following three embodiments show the sequence of several row scanning orders. Circulation and figures
The selected row scanning order is calculated by measuring the of merit, selecting the row scanning order that meets a certain criterion, and driving the display device using the order. Each of these embodiments, as well as any of the other embodiments including measurement of the figure of merit from the display device, performs a cycle while retaining images for two or more frames, thereby providing an accurate figure. It becomes possible to measure of merit. Because each row scan order can have different power requirements, and some of these power requirements can be higher than the power the pre-trigger order requires, pre-triggering in this order of sequential cycles In some cases, more power may be drawn than is drawn using the sequence. Therefore, when calculating the figure of merit from the driven display, it is expected that there will be a trade-off that considers the frequency and timing of attempts to discover lower power states. Using a fixed trigger ratio implementation, it is desirable to maintain each row scan order by a sequential cycle of S orders for 10 to 30 times the period required to calculate the desired scan order. In this third embodiment, the scan cycles are triggered at regular time intervals.

FIG. 9 is a block diagram in which the hardware layout and the flowchart of the third embodiment of the present invention are combined, and in this embodiment, the selection of the row scanning order triggers the cycle counter. In this embodiment, the order selection device 903 and the cycle counter 901 are incorporated in the display driver shown in FIG. The order selector 903 passes the index or some other display value of the selected row scan order onto the scan order generator 437. The operation of the display device based on the output from the sequence generator has been described in detail above. At programmed time intervals, the period counter 901 triggers the order selector 903 to cycle through all the row scan orders of the generator. For most LCD displays, a time interval of about 5 seconds between successive triggers gives good results. However, this cycle may differ between the display technology and the displayed information. When triggered, the order selector 903 proceeds to the next and instructs the display to sequentially generate an image using each of several scan orders. Figure of the
Merit measure 415 is generated by any suitable technique. The figure of merit measurement output value is stored in an order selection device with an associated representation of the scan order (this is shown schematically in FIG. 9 by the circled block labeled "A"). ing). When all of the scan orders have been checked and the figures of merit of those scan orders have been stored, one of the row scan orders is selected by the order selector 903 based on the figures of merit, thereby , The display device is driven using the row scanning order, which is the optimum order available to the order generator 437. As mentioned above, each scan order is retained long enough to obtain an accurate figure of merit calculation.

[0053] Fourth embodiment: OF 10 row scanning sequence using the Configuration A of merit, which is determined triggered by a change in the display input signal, the fourth embodiment of the present invention the hardware Is a block diagram combining the layout of FIG. 1 and a flowchart, and in the above embodiment, the selection of the row scanning order is triggered by a display input signal. In particular, the fourth embodiment sequentially cycles through a number of row scan orders in response to changes in the input display while measuring the figure of merit for each order. A row scanning order is selected based on a predetermined criterion, and the display device is driven by using the selected row scanning order.

In the embodiment of FIG. 10, the order selection device 903 and the input drive trigger generation device 100.
1 is incorporated in the display driver of FIG. By the order selection device 903,
The index or some other display value is passed onto the scan order generator 437. The operation of the display device based on the output of the sequence generator used in the trigger circuit of the description of the third embodiment will be described in detail with reference to FIG. Input drive trigger generator 1
001 monitors the display input signal 431, and ((E)
Trigger the order selector 903 (through the circled block labeled) to cycle through all or some of the available row scan orders. As with the third embodiment, the order selector 903, once triggered, sequentially cycles through the row scan order, stores the measured figure of merit, and displays until further triggers. Compute the selected row scan order for driving the.

[0055] Fifth embodiment: utilizing the measured figure of merit, OF 11 row scan order triggered by a change in Configuration A of merit is, the fifth embodiment of the present invention FIG. 3 is a block diagram combining the hardware layout and the flowchart of FIG. 1, in which the selection of the row scanning order is triggered by the change of the figure of merit. In particular, the fifth embodiment sequentially cycles through a number of row scan orders while making a figure-of-merit measurement for each order in response to changes in the measured figure-of-merit. A row scanning order is selected based on a predetermined selection criterion, and the selected row scanning order is used to drive the display device.

In the embodiment of FIG. 11, the order selection device 903 and the figure of merit drive trigger generation device 1101 are incorporated in the display driver of FIG. The order selector 903 passes the index or some other display value of the selected row scan order onto the scan order generator 701. The operation of the display device based on the sequence generator output used in the trigger circuit of the description of the third embodiment will be described in detail with reference to FIG. Figure of Merit Drive Trigger Generator 110
1 monitors the output of the figure of merit measurement 415 and then triggers the sequence selector 903 based on changes in the figure of merit to sequentially cycle through all or some of the available row scan sequences. To do. As with the third and fourth embodiments, the order selector 903, once triggered, sequentially cycles through the row scan order, stores the measured figure of merit, and until further triggered. , Calculate the selected row scan order for driving the display.

Sixth Embodiment: Fixed Row Scan Order As outlined in the previous embodiments, in addition to runtime detection of the optimal row scan order, it is also possible to preselect the order of the entire class of applications. It is possible.
This embodiment may be particularly useful for devices such as mobile messaging cell phones, personal digital assistants or pagers and the like. For example, the order {2
The order {1, 3, 5, ...} preceding the 4,6, ...} check pattern (often used to simulate gray on 1 pixel / 1 bit displays such as STN LCDs) Column drivers drastically reduce power consumption for patterns and on / off stripes (often used to create on-screen GUI menus), whereas all other patterns It is known that the reduction in power consumption is moderate. The sequence {1, 3, 5, ..., Which precedes the sequence {2, 4, 6, ...}
}, Etc. It is also possible to incorporate such an implementation with a scan order generator as shown in FIG. 4 having a fixed non-sequential row scan order such as. Swapping the LSB and MSB of the digital counter allows the generation of such a series of sequences. For example, a 7-bit counter is used to control 128 rows of LCDs. Then, swapping bit-7 and bit-0 of the counter produces a series {0,2,4,6,8, ...} + {1,3,5,7, ...}. Apart from the above, constructing a non-sequential row scan order into the decoder, and R
It is possible to produce the same result with an AM address generator.

Alternative Embodiments Other combinations or rearrangements of components that perform the same functions described herein are known in the art. Other functionally equivalent configuration examples include, but are not limited to, the following configurations. A configuration having a decoder / driver function implemented by two or more separate components in which a decoding circuit and a driving circuit are separated, generating a sequence, storing power values, and determining an optimum sequence after measuring power in the last sequence. A configuration that combines an order selection device and a generation device in a single module to be selected, an increase row generation device, a decrease row generation device, and a plurality of order generation devices that generate various types of orders such as a pseudo-random generation device, A configuration that passes the row order index to the order generator instead of the actual row scan order. In addition, another algorithm, derived using algorithms such as state machine theory or neural networks, has the ability to cycle through a series of row-scan orders, optimally using the optimum order to power the display. Some perform order calculations. Among the alternatives of calculating the figure of merit and selecting the optimal row scan order is pre-calculating the figure of merit for a given display information and row scan order, and pre-calculating these. It is also possible to include the step of calculating the order based on the values.

[Brief description of drawings]

FIG. 1 is a plan view of a prior art liquid crystal display device that defines the pixel geometry and includes some schematic diagrams of prior art display drive circuits.

[Fig. 2]   2 shows a waveform according to a conventional technique used for driving a passive liquid crystal display device.

[Figure 3]   7 shows a display drive waveform of the present invention.

FIG. 4 is a block diagram of drive hardware for display showing measurement of the figure of merit of the present invention.

FIG. 5 is a block diagram hardware layout of a first embodiment of the present invention in which a display input signal is used to calculate an optimum row scan order.

FIG. 6 is a flow chart of a first embodiment of the present invention in which a display input signal is used to calculate an optimum row scan order.

FIG. 7 is a flow chart of a second embodiment of the invention in which the row scan order is calculated before image generation.

FIG. 8 is a block diagram combining the hardware layout and flowchart of the second embodiment of the present invention, in which the row scan order is calculated before image generation.

FIG. 9 is a block diagram combining the hardware layout and flowchart of the third embodiment of the present invention, in which the selection of the row scan order triggers the period counter.

FIG. 10 is a block diagram combining the hardware layout and flowchart of the fourth embodiment of the present invention, in which the row scan order selection is triggered by a display input signal.

FIG. 11 is a block diagram combining the hardware layout and flowchart of the fifth embodiment of the present invention, in which row scan order selection is triggered by a change in figure of merit. .

[Procedure amendment]

[Submission date] November 5, 2002 (2002.1.1)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Contents of correction]

[Claims]

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Claims (43)

[Claims] 1. A row addressing signal and a column data signal for addressing a display device having a two-dimensional array of pixels arranged in rows and columns and applying to one or more pixel rows at a time. A method of addressing the array by applying in a sequence specified by a row scan order, the method comprising: obtaining a preferred row scan order based on a corresponding figure of merit of the preferred row scan order. The method of including, wherein the figure of merit is indicative of power consumed by the display device for generating an image. 2. The method of claim 1, wherein the figure of merit is a measurement of the power consumed by the display device. 3. The method of claim 1, wherein the figure of merit is a measurement of current for driving the column data signal. 4. The method of claim 1, wherein the figure of merit is a measurement of column data signal toggle frequency. 5. The method of claim 1, wherein the figure of merit is a measurement of multiple charge pumping cycles of the column data signal. 6. The method according to claim 1, wherein the acquisition step comprises a look-up table indicating the preferred row scan order based on the target image to be generated. 7. The method of claim 6, further comprising driving the display device with the row addressing signal and the column data signal based on the preferred row scan order. . 8. The method of claim 1, wherein the obtaining step comprises the steps of: a) a plurality of row scanning orders and a figure-of-pieces corresponding to the plurality of row scanning orders.
Obtaining a merit and b) selecting a preferred row scan order from one of the plurality of row scan orders based on a corresponding figure of merit of the plurality of row scan orders. The method of including, further comprising driving the display device with the row addressing signal and a column data signal based on the preferred row scan order. 9. Method according to claim 8, characterized in that steps a) and b) are carried out at regular time intervals. 10. The method according to claim 8, wherein steps a) and b) are performed when a change in the image is detected, the method further comprising detecting the change in the image. A method characterized by the following. 11. The method according to claim 8, further comprising the step of setting a threshold, wherein when the figure of merit exceeds the threshold, steps a) and b) are performed. A method characterized by being exposed. 12. The method of claim 11, wherein the threshold is a figure of merit of a previously displayed image using the row addressing signal and the column data signal based on a previous preferred row scan order. A method characterized by being. 13. The method of claim 8, wherein the figure of merit is obtained without generating the image on the display device. 14. The method of claim 8, wherein the figure of merit is measured while step a) is performed. 15. The method of claim 8 wherein each row scan order specifies that each pixel row is addressed once. 16. The method of claim 15, wherein the row scan order comprises a pseudo-random order. 17. The method of claim 15, wherein the rows include 1 through N (N
, And in which case the row scanning order addresses the pixel row by the row number of the pixel row according to at least one arithmetic sequence. 18. The method of claim 17, wherein the at least one or more arithmetic sequences are: a) a first sequence {1, 3, 5, ..., i ≦ N}, and c) a second sequence. , I ≦ N}, wherein the row addressing signals are sequentially applied to the rows numbered according to the first number sequence and then according to the second number sequence. A method characterized in that the numbered rows are sequentially applied. 19. The method of claim 17, wherein the at least one or more arithmetic sequences are a) a first sequence {1, 4, 7, ..., i ≦ N} and b) a second sequence. , I ≦ N}, and c) a third sequence {3, 6, 9, ..., i ≦ N}, wherein the row addressing signal is the first Sequentially applied to rows numbered according to a sequence of numbers, then sequentially applied to rows numbered according to the second sequence of numbers, and further applied to rows numbered according to the third sequence of numbers. A method characterized by: 20. A method of addressing a display device for generating an image based on a row scanning order, the display device comprising a two-dimensional array of pixels arranged in rows and columns, the method comprising: In this case, the array is addressed by applying a row addressing signal and a column data signal based on the target image to be generated, and further, the row scanning order is to address one or more pixel rows in the array. A method configured to specify an order of execution, the method comprising the step of obtaining a preferred row scan order, wherein the preferred row scan order is such that the pixel rows are addressed in a skipped adjacent row order. A method characterized by specifying. 21. The method of claim 20, wherein the pixel rows are numbered from 1 to N (inclusive), and the row scan order is: i) a first sequence {1, , 5, ..., i ≦ N} and ii) a second sequence {2, 4, 6, ..., i ≦ N}, wherein the row addressing signals are numbered according to the first sequence. A method wherein the applied rows are sequentially applied, and then sequentially applied to the numbered rows according to the second sequence. 22. A method of calculating the power required by a display device to generate an image, the display device comprising a two-dimensional array of pixels arranged in rows and columns, wherein: The array is addressed by applying a row addressing signal and a column data signal based on the target image to be generated, and further a figure of power showing the power consumed by the display device to generate the image. A method characterized by having a step of acquiring a merit. 23. The method of claim 22, wherein the figure of merit is power consumed by the display device, current for driving the column data signal, column data signal toggle frequency, or A method comprising: including the number of charge pumping cycles for the column data signal. 24. A device for reducing display power for generating an image by changing a row scanning order, said display device comprising a two-dimensional array of pixels arranged in rows and columns, In this case, the array is addressed by applying a row addressing signal and a column data signal based on the target image to be generated, and the order of addressing one or more pixel rows in the array is the row. In a device configured to specify a scan order, the driver providing information for driving a display device, the driver comprising a display logic element for periodically selecting the row scan order. An apparatus comprising: selecting the selected row scanning order so as to reduce display power for generating an image. 25. The apparatus according to claim 24, wherein the display logic element periodically selects the row scanning order according to a change in an image to be generated. 26. The apparatus of claim 24, wherein at least one of the plurality of row scanning orders specifies that pixel rows are addressed in an order that skips one or more rows. . 27. The apparatus according to claim 24, further comprising a display device for generating an image in response to the display input signal, wherein the display device is the selected row scanning order. A device for generating the image from the row address and column data signals based on 28. The device according to claim 27, wherein the display device comprises a passive LCD display device, an active LCD display device, an electroluminescence display device, or a plasma display device. 29. A device for reducing display power for generating an image by changing a row scanning order, said display device comprising a two-dimensional array of pixels arranged in rows and columns, In this case, the array is addressed by applying a row addressing signal and a column data signal based on the target image to be generated, and the order of addressing one or more pixel rows in the array is the row. An apparatus configured to specify a scan order, comprising an order generator for generating the row scan order. 30. The apparatus of claim 29, wherein the order generator is controllable to generate a specified row scan order. 31. The apparatus of claim 30, further comprising a sequence selection device that controls the sequence generation device to generate a preferred row scan sequence. 32. The apparatus of claim 29, wherein the sequence generator can be configured to sequentially generate a plurality of row scan orders. 33. The apparatus of claim 32, wherein the order generator can be triggered to generate a plurality of row scan orders. 34. The apparatus according to claim 29, further comprising a display device that generates an image in response to the display input signal, wherein the display device is based on the row scanning order. An apparatus for generating the image from the row address and the column data signal. 35. The device according to claim 34, wherein the display device comprises a passive LCD display device, an active LCD display device, an electroluminescence display device, or a plasma display device. 36. The apparatus of claim 29, wherein the rows include 1 through N (N
In addition, the order generation device generates a row scanning order that specifies that the pixel rows are addressed in an order that addresses are specified once for each of the pixel rows. In addition, in that case, the order {1, 2,
, N}, in which the row addressing signals are applied to each of the pixel rows in a different order. 37. The apparatus according to claim 36, wherein the order generation device comprises: i) a first sequence of numbers {1, 3, 5, ..., i ≦ N}; and ii) a second sequence of numbers {2, , 6, ..., i ≦ N}, in which case the output of the order sequentially addresses the rows according to the order of the first sequence, and further the second order. Apparatus for sequentially addressing rows according to the above order of the sequence of numbers. 38. A device for controlling the power required to generate an image on a display device, said display device comprising a two-dimensional array of pixels arranged in rows and columns, in which case Figure of merit measuring apparatus configured to address the array by applying a row addressing signal and a column data signal based on a target image, the figure of merit measuring apparatus A device comprising: the figure of merit corresponding to the display input signal and the row scan order is a function of the display power consumption. 39. The apparatus according to claim 38, wherein said figure of merit measurement is power consumed by said display device, current for driving said column data signal, column data signal toggle frequency, or An apparatus comprising the number of charge pumping cycles for the column data signal. 40. An apparatus for generating an image on a display device in a fixed row scanning order, said display device comprising a two-dimensional array of pixels arranged in rows and columns, the target image being generated. Addressing the array by applying a row addressing signal and a column data signal based on, and further, the row scanning order specifies an order of addressing one or more pixel rows in the array. The apparatus of claim 1, having a row scan order that skips one or more pixel rows. 41. The apparatus of claim 40, wherein the rows include 1 through N (N
)), In which case the row scanning order specifies that the pixel rows are addressed in the order in which each of the pixel rows is addressed once, and further, in that case, Apparatus for applying the row addressing signal to each of the pixel rows in a different order than the order {1, 2, ..., N}. 42. The apparatus according to claim 41, wherein the order generation device is: i) a first sequence of numbers {1, 3, 5, ..., i ≦ N}; ii) a second sequence of numbers {2, , 6, ..., i ≦ N}, in which case the output of the order sequentially addresses the rows according to the order of the first sequence, and further the second order. Apparatus for sequentially addressing rows according to the above order of the sequence of numbers. 43. A mobile phone comprising a display device having a fixed row scanning order, said display device comprising a two-dimensional array of pixels arranged in rows and columns, in which case it is generated. Addressing the array by applying a row addressing signal and a column data signal based on the target image, and further adding 1 to the array
In a device configured such that the row scanning order specifies the order of addressing the pixel rows described above, the apparatus having a row scanning order skipping one or more pixel rows. .