TWI385630B - Dot matrix screen data refresh voltage charging control method and ciruit system - Google Patents

Description

Pixel array data update charging control method and circuit system

The present invention relates to a display technology, and more particularly to a pixel array data update charging control method and circuit system, which can be applied to a display device, such as an active liquid crystal display, for the display device. The pixel array on the top provides a data update charging control function.

The active liquid crystal display is a widely used screen display device for various personal computers, especially notebook computers. In a specific implementation, the liquid crystal display has a pixel unit of an array of NxM, that is, a pixel unit having N columns in the horizontal direction and a pixel unit of M rows in the longitudinal direction; wherein each pixel unit is transparent to one pixel unit The charging method is displayed as a specific gray value.

However, in practical applications, the screen resolution of current personal computers has progressed from the early 640x480 to the current high resolution of 1920x1080, or even higher, with the evolution of computer technology. Since the number of pixel units on such a high-resolution liquid crystal display screen is extremely large, in order to maintain the instant display of the picture data, the charging procedure of the data update needs to be accelerated. However, if we want to speed up the charging process, it will reduce the charging time of the pixel unit, which will cause the problem of insufficient charging.

In view of the above problems, an important research topic in the computer industry is to design a new liquid crystal display pixel array data update charging control method, which can complete the pixel unit in a short time. The charging action required for data update to provide a fast scanning rate.

The main object of the present invention is to provide a pixel array data update charging control method and circuit system, which can enable a high-resolution liquid crystal display to complete each time in a shorter time period when performing a screen data update program. The charging action of the pixel unit to thereby provide a fast scanning rate.

The pixel array data update charging control method of the present invention includes at least the following control actions: (M1) temporarily storing a whole screen image when the pixel array displays a full screen; (M2) generating one Periodically updating the control signal, and sequentially outputting the data update control signal to each pixel column in the pixel array, thereby sequentially turning each pixel column into a charging enable state; (M3) performing each time When the screen data update program is performed, each new picture data column and the temporarily stored old picture data column are simultaneously read, and a lock function is provided for each of the read new picture data columns and the old picture data columns; (M4) Converting each pixel data in each new picture data column and old picture data column into a corresponding analog data voltage; and (M5) converting the data voltage of each new picture data column through digital to analog conversion Each old picture data column is compared by a data voltage obtained by digital to analog conversion, thereby obtaining a voltage difference between the two, and the voltage difference is used as a charging voltage to lose To the pixel array, corresponding to the pixel unit so that the charging voltage so that it receives a data voltage value by the current is adjusted to change the voltage value of the new picture data.

The pixel array data update charging control circuit system of the present invention is designed to perform the above control method, and the physical architecture includes at least: (A) a scanning circuit; and (B) a data driving circuit; and wherein the data driving circuit The internal architecture includes at least: (B0) a picture data temporary storage module 201; (B1) a picture data column latch circuit; (B2) a digital to analog converter array module; and (B3) a charging voltage generated Array module.

The pixel array data update charging control method and circuit system of the present invention are characterized in that the voltage value corresponding to the pixel data value in each new picture data column and the old picture data column can be used each time the picture data updating program is performed. For comparison, the voltage difference between the two is obtained, and the voltage difference is output as a charging voltage to the pixel array, so that the corresponding pixel unit receives the charging voltage and makes the existing data voltage The value is changed to be adjusted to the data voltage value of the new screen. This method makes it possible to update the new picture data of each pixel without reapplying the entire charging voltage, and only needs to apply the voltage difference between the picture and the previous picture, so that each time can be completed in a shorter time. The charging action of the pixel unit, thereby providing a faster scanning rate.

Hereinafter, an embodiment of the pixel array data update charging control method and circuit system of the present invention will be described in detail in conjunction with the accompanying drawings.

Application and function of the invention

1A-1B shows the application of the pixel array data update charging control circuitry of the present invention (as indicated by the block indicated by reference numeral 40). As shown in the figure, the pixel array data update charging control circuit system 40 of the present invention is integrated into a display device 10 in practical applications, such as an active liquid crystal display pixel array, and the display device 10 has a pixel. The array 20 and a video memory 30; wherein the pixel array 20 has a pixel unit of an NxM array, that is, a pixel unit having N columns in the horizontal direction and a pixel unit having M rows in the vertical direction. . In actual operation, the pixel array data update charging control circuit system 40 of the present invention can provide a charging control function for updating the data on the pixel array 20 on the display device 10, thereby using the video memory 30. The stored picture data is displayed on the pixel array 20.

As shown in FIG. 2, the N pixel columns in the pixel array 20 are represented, for example, as PIXEL_ROW(1), PIXEL_ROW(2), ....., PIXEL_ROW(N), where each pixel column includes M. a pixel unit; and the data column of each frame stored in the video memory 30 is represented, for example, as DATA_ROW (1), DATA_ROW (2), . . . , DATA_ROW (N), and each of the picture data The column includes M sets of pixel data, and each set of pixel data represents the gray value to be displayed by the corresponding pixel unit.

The function performed by the pixel array data update charging control circuit system 40 of the present invention is to write the picture data column DATA_ROW(1) to the pixel column PIXEL_ROW(1) and the picture data column DATA_ROW(2) to The pixel column PIXEL_ROW (2), the picture data column DATA_ROW (3) is written to the pixel column PIXEL_ROW (3), and so on.

Architecture of the present invention

As shown in FIG. 1B, the architecture of the pixel array data update charging control circuit system 40 of the present invention includes at least: (A) a scanning circuit 100; and (B) a data driving circuit 200; and wherein the data driving circuit 200 The internal architecture includes at least: (B0) a picture data temporary storage module 201; (B1) a picture data column latch circuit 210; (B2) a digital to analog converter array mode as shown in FIG. Group 220; and (B3) a charging voltage generator array module 230. The individual properties and functions of these components are first described separately below.

Scan circuit 100

The scan circuit 100 is configured to generate a data update control signal OE with a predetermined scan period T _scan , and sequentially output the data update control signal OE to each pixel column in the pixel array 20, thereby sequentially The pixel sequence is turned on as the charge enable state; that is, in the first scan cycle T _scan , the data update control signal OE turns on the first pixel column PIXEL_ROW(1) to be in a charge enable state; scanning period T _scan information is updated so that the control signal OE to the second column pixels pIXEL_ROW (2) opening a charging enabling state; and so on.

Since the function of this scanning circuit 100 is basically the same as that of the prior art, the internal architecture will not be described in detail below.

Data driving circuit 200

The internal architecture of the data driving circuit 200 includes at least: (B0) a picture data temporary storage module 201; (B1) a picture data column latch circuit 210; (B2) a digit to analogy as shown in FIG. a converter array module 220; and (B3) a charging voltage generator array module 230. The individual attributes and functions of these components are described below.

Picture data temporary storage module 201

The screen data temporary storage module 201 is a memory device or a data buffer for temporarily storing a backup of one of the screen data displayed by the pixel array 20; that is, whenever the display device 10 is After the image data of the grid is updated to the pixel array 20, the entire screen data is copied and temporarily stored in the screen data temporary storage module 201.

Picture data column latch circuit 210

The screen data column latch circuit 210 can sequentially read out each data column in the new screen from the video memory 30 when the display device 10 performs the screen data update program for each time, and the following is expressed as [NEW_DATA__ROW(1), NEW_DATA_ROW(2), ....., NEW_DATA_ROW(N)]; and at the same time, each data column in the old picture is read from the above-mentioned picture data temporary storage module 201, and the following is expressed as [OLD_DATA__ROW(1), OLD_DATA_ROW (2), ........, OLD_DATA_ROW(N)]; and provide a sequential latching function for each new picture data column and old picture data column read.

When the screen data update program is actually performed, the screen data column latch circuit 210 reads one new screen data column and its corresponding old screen data column in each scan period T _scan ; that is, in the first scan video memory 30 is read in a first row a new picture NEW_DATA_ROW (1) and the aiming period T _scan module 201 temporarily stores the picture data in the same column corresponding to rows of the old picture OLD_DATA_ROW (1); on the first The second new picture data column NEW_DATA_ROW (2) in the video memory 30 and the corresponding old picture data column OLD_DATA_ROW (2) in the picture data temporary storage module 201 are read in the two scan periods T _scan ; analogy.

Digital to analog converter array module 220

The digital-to-analog converter array module 220 includes an array of digital-to-analog converters (DACs), and is connected to the above-mentioned picture data column latch circuit 210 for using the above picture The digitized data of each pixel in the new picture data column and the old picture data column latched by the data column latch circuit 210 is converted into a corresponding analog voltage.

Charging voltage generator array module 230

The charging voltage generator array module 230 includes an array of charging voltage generators 300 as shown in FIG. 4A, and the new picture data columns latched by the above-mentioned picture data column latch circuit 210 and corresponding ones The analog pixel data of the old picture data column is respectively transmitted to the input terminals ( V ₁ , V ₂ ) of the respective charging voltage generators 300 by the analog voltages converted by the digital to analog converter array module 220. In comparison, the voltage difference between the two is used as a charging voltage, and the obtained charging voltage is output to the corresponding pixel in the pixel array 20 via its output terminal V _OUT . The M charging voltages outputted by the charging voltage generator array module 230 are expressed as [ΔV(1), ΔV(2), . . . , ΔV(M)].

Taking the data update of the first pixel sequence PIXEL_ROW (1) as an example, the data update control signal OE generated by the scan circuit 100 in the first scan cycle T _scan causes the first pixel column PIXEL_ROW. (1) is turned on to be in a charge enable state. At the same time, the picture data column latch circuit 210 reads and latches the corresponding new picture data column in the first new picture data column NEW_DATA_ROW (1) and the picture data temporary storage module 201 in the video memory 30. OLD_DATA_ROW(1), so that the M digitized pixel data respectively in NEW_DATA_ROW(1) and OLD_DATA_ROW(1) are converted into analog voltage by the digit to the analog converter array module 220, and respectively transmitted to each charging. The input terminals ( V ₁ , V ₂ ) of the voltage generator 300 are compared to obtain a voltage difference between the two as a charging voltage, and the obtained M charging voltages [ΔV (1) ), ΔV(2), . . . , ΔV(M)] is output to the pixel array 20 via its output terminal V _OUT .

If the data value of one of the pixels in the new picture data column NEW_DATA_ROW(1) is larger than the corresponding pixel in the old picture data column OLD_DATA_ROW(1), the generated charging voltage is a positive value; if equal, the charging voltage is Zero value; if it is less than, the charging voltage is negative.

In a specific implementation, each of the charging voltage generators 300 in the charging voltage generator array module 230 can have a plurality of different circuit design manners. Ideally, the charging voltage generator 300 can be implemented directly using an analog voltage comparator. However, in the current liquid crystal display technology, since the pixel units in the pixel array 20 have a long connection line from the data driving circuit 200, the longer connection lines may be caused during the charging process. It has a large capacitance and causes its circuit to have a large charging time constant. For this reason, for a pixel column far from the data driving circuit 200, in theory, we should correspondingly adjust the charging voltage generated by the charging voltage generator array module 230 upward.

According to the above concept, we can set the N pixel columns PIXEL_ROW(1), PIXEL_ROW(2), ....., PIXEL_ROW(N) on the pixel array 20 to a pre-designed segment according to the transmission line model. The method is divided into a plurality of segments, and the charging time constant of the line corresponding to the pixel column of the specific position in each segment is the common charging time constant of the segment; and when the charging voltage generator 300 is designed, the different regions are The charging time constant of the segment of the pixel is taken into account to produce an enhanced charging voltage. The circuit structure of the charging voltage generator 300 according to the concept is as shown in FIG. 4B, and the circuit architecture includes a timing controller 310, an analog voltage comparator 320, and a resistor array 330; and timing control thereof The internal circuit architecture of the device 310 is as shown in FIG. 4C. The charging voltage generator 300 can control the switching of different resistors in the resistor array 330 through the timing controller 310 to provide a segment adjustment function for the currently output charging voltage. In the present specification, the circuit structure shown in FIG. 4B-4C will hereinafter be referred to as a "segment-adjusted charging voltage generator". The principle of the internal circuit architecture of the sector-adjusted charging voltage generator shown in Figure 4B-4C and the theory on which it is based have been disclosed in detail in the following scientific paper " ACTIVE AND ADAPATIVE CHARGING METHOD ON DATA LINES FOR DELAY COMPENSATION "and" PRECISE CHARGING METHOD WITH MULTIPLE ROWS "(Chun-Hsi Chen et al); therefore, it will not be described in detail in this specification.

It should be noted here that the circuit structure of the charging voltage generator 300 used in the present invention is not limited to the segment-adjusting charging voltage generator disclosed in FIG. 4B-4C, and there are many other different circuit designs. the way.

In addition, if there is a liquid crystal display technology in the future, the line distance between all the pixel columns and the data driving circuit is the same (that is, the charging time constants are the same), then in this case, it is not necessary to consider different The pixel array has different charging time constants without using a charging voltage generator having a segmentation adjustment function; that is, in this case, each charging voltage generator 300 can directly utilize a analog voltage comparator to specifically achieve.

Fig. 5 is a view showing a physical circuit architecture specifically designed by the data driving circuit 200 in accordance with the conceptual basic structure shown in Fig. 3. However, it should be noted that the conceptual basic architecture shown in FIG. 3 is not limited to the physical circuit architecture disclosed in FIG. 5, and there are many other different physical circuit design methods.

The mode of operation of the present invention

Hereinafter, an application example will be used to explain the operation mode of the pixel array data update charging control circuit system 40 of the present invention in practical application.

After the display device 10 displays the image data of a whole cell in the video memory 30 on the pixel array 20, the pixel array data update charging control circuit system 40 of the present invention copies the picture data of the whole cell. And temporarily store it in the screen data temporary storage module 201.

Then, when the display device 10 performs a screen data update program on the pixel array 20, the data update control signal OE generated by the scan circuit 100 in the first scan period T _scan causes the first pixel column PIXEL_ROW. (1) is turned on to be in a charge enable state. At the same time, the screen data column latch circuit 210 reads and latches the first new screen data column NEW_DATA_ROW (1) in the video memory 30 and the corresponding old screen temporarily stored in the screen data temporary storage module 201. The data column OLD_DATA_ROW(1) is such that the M pixel unit data respectively of NEW_DATA_ROW(1) and OLD_DATA_ROW(1) are converted into analog voltage by the digit to the analog converter array module 220. The analog voltages are then transmitted to the input terminals ( V ₁ , V ₂ ) of the M charging voltage generators 300 in the charging voltage generator array module 230 for comparison, thereby obtaining a voltage between the two. The difference is used as a charging voltage, and the obtained M charging voltages [ΔV(1), ΔV(2), . . . , ΔV(M)] are passed through the output terminal V _{OUT thereof} . It is output to the corresponding pixel unit in the pixel array 20, whereby the charging voltage can be applied to the corresponding pixel unit.

If the data value of one of the pixels in the new picture data column NEW_DATA_ROW(1) is larger than the corresponding pixel in the old picture data column OLD_DATA_ROW(1), the generated charging voltage is a positive value; if equal, the charging voltage is That is, it is a zero value; if it is less than, the charging voltage is a negative value.

The M charging voltages outputted by the charging voltage generator array module 230 are transmitted to the pixel array 20, so that the M charging voltages [ΔV(1), ΔV(2), . . . , ΔV (M)] is applied to the M pixel units in the first pixel column PIXEL_ROW(1), respectively. If the charging voltage is positive, the current data voltage of the corresponding pixel unit will be increased, thereby adjusting the data voltage of the pixel unit upward to the data voltage value that should be possessed after the data update. . On the other hand, if the charging voltage is negative, the current data voltage of the corresponding pixel unit will be lowered, thereby adjusting the data voltage of the pixel unit downward to the data update. Data voltage value.

After the data update of the first pixel column PIXEL_ROW(1) is completed, the data update control signal OE generated by the scan circuit 100 in the second scan cycle T _scan causes the second pixel column PIXEL_ROW ( 2) being turned into a charge enable state; and at the same time, the picture data column latch circuit 210 reads and latches the second new picture data column NEW_DATA_ROW(2) in the video memory 30 and temporarily stores the picture data. The corresponding old picture data column OLD_DATA_ROW(2) in the module 201 is repeatedly executed once to update the data of the second pixel column PIXEL_ROW(2).

The above data update action will be repeated until the last pixel column PIXEL_ROW(N) completes the data update. After the last pixel column PIXEL_ROW(N) completes the data update, the next screen data update procedure is performed in the same manner.

In summary, the present invention provides a pixel array data update charging control method and circuit system, which is characterized in that each time a picture data update program is performed, the pixel data values in each new picture data column and the old picture data column can be The corresponding voltage value is compared to obtain a voltage difference between the two, and the voltage difference is output as a charging voltage to the pixel array, so that the corresponding pixel unit receives the charging voltage. The existing data voltage value is changed to be adjusted to the data voltage value of the new screen. This method makes it possible to update the new picture data of each pixel without reapplying the entire charging voltage, and only needs to apply the voltage difference between the picture and the previous picture, so that each time can be completed in a shorter time. The charging action of the pixel unit, thereby providing a faster scanning rate. The invention thus has better advancement and utility than the prior art.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the technical scope of the present invention. The technical contents of the present invention are broadly defined in the following claims. Any technical entity or method performed by any other person that is identical to, or equivalent to, the ones defined in the scope of the claims below will be considered to be included in the scope of the invention.

10. . . Display device (liquid crystal display screen)

20. . . Pixel array

30. . . Video memory

40. . . The pixel array data update charging control circuit system of the invention

100. . . Scanning circuit

200. . . Data drive circuit

201. . . Screen data temporary storage module

210. . . Picture data column latch circuit

220. . . Digital to analog converter array module

230. . . Charging voltage generator array module

300. . . Charging voltage generator

310. . . Timing controller

320. . . Analog voltage comparator

330. . . Resistor array

1A and 1B are application diagrams for showing the application mode of the pixel array data update charging control circuit system of the present invention integrated into a liquid crystal display; FIG. 2 is a conceptual diagram for showing the video memory of the present invention. One of the whole picture data is written to the basic concept of the pixel array; FIG. 3 is a schematic diagram showing the internal basic structure of the data driving circuit used in the present invention; FIGS. 4A to 4C are schematic diagrams of the structure An embodiment for respectively showing the internal architecture of the charging voltage generator array module used in the present invention and the internal circuit architecture of each charging voltage generator therein; FIG. 5 is a schematic structural view showing the present invention. A feasible circuit structure design method for the specific implementation of the data driving circuit.

20. . . Pixel array

30. . . Video memory

200. . . Data drive circuit

201. . . Screen data temporary storage module

210. . . Picture data column latch circuit

220. . . Digital to analog converter array module

230. . . Charging voltage generator array module

Claims (6)

A pixel array data update charging control method, which can be applied to a display device, and the display device has a pixel array and a video memory for providing a data update charging control program for the pixel array; The pixel array data update charging control method at least includes: temporarily storing a whole frame of the image data when the pixel array displays a full screen; generating a periodic data update control signal, and updating the data The control signal is sequentially outputted to each pixel column in the pixel array, so that each pixel column is sequentially turned into a charge enable state; when each screen data update program is performed, each new picture data column is simultaneously read and The old picture data column is temporarily stored, and provides a latching function for each of the read new picture data columns and the old picture data columns; each pixel data column in the new picture data column and the old picture data column will be latched Converting into a corresponding analog data voltage; and converting the data voltage of each new picture data column to digital analog to analogy and each old picture The data column is compared by a data voltage obtained by digital to analog conversion, thereby obtaining a voltage difference between the two, and outputting the voltage difference as a charging voltage to the pixel array, so that the corresponding painting The prime unit receives the charging voltage and adjusts its existing data voltage value to a new screen. The data voltage value; wherein the generation process of each charging voltage further includes a segment adjustment function, which can adjust each charging correspondingly according to the charging time constant of the segment of the pixel column currently being turned on as the charging enable state Voltage. The pixel array data update charging control method according to claim 1, wherein the display device is an active liquid crystal display. A pixel array data update charging control circuit system can be integrated into a display device, and the display device has a pixel array and a video memory for providing a data update charging control function for the pixel array; The pixel array data update charging control method system at least includes: a scanning circuit for generating a periodic data update control signal, and sequentially outputting the data update control signal to each pixel column in the pixel array. By sequentially turning on each pixel column into a charging enable state; and a data driving circuit, the architecture includes at least: a picture data temporary storage module, which can temporarily store one of the picture frames currently displayed by the pixel array Data; a picture data column latching circuit, which can sequentially read each new picture data column from the video memory body and temporarily store the data from the picture data when the display device performs each picture data update program. The module reads each corresponding old picture data column, and provides a latching function for each of the read new picture data columns and the old picture data columns; a digital to analog converter array module, which can Each pixel data in the new picture data column and the old picture data column latched by the data column latch circuit is converted into a corresponding analog data voltage; and a charging voltage generator array module can be used for the picture Comparing the data voltages converted by the digits to the analog converter array module and the data voltages corresponding to the old image data columns by the data column of the data column latched digit circuit The voltage difference between the two is obtained, and the voltage difference is outputted to the pixel array as a charging voltage, so that the corresponding pixel unit receives the charging voltage and the existing data voltage value is changed. Adjust the data voltage value of the new screen. The pixel array data update charging control circuit system according to claim 3, wherein the display device is an active liquid crystal display. The pixel array data update charging control circuit system of claim 3, wherein the charging voltage generator array module comprises an array of charging voltage generators, wherein each charging voltage generator is a analog voltage comparison Device. The pixel array data update charging control circuit system of claim 3, wherein the charging voltage generator array module comprises an array of charging voltage generators, wherein each charging voltage is generated. The device has a segment adjustment function, and the pixel voltages of the pixels in the pixel array are correspondingly adjusted according to the charging time constant of the segment in which the pixel is located.