KR100539231B1 - Liquid Crystal Display Driver providing for horizontal scroll function and driving method thereof - Google Patents

Abstract

Disclosed are a driving device and a method of a liquid crystal display device having a horizontal scroll function. The driving apparatus of the liquid crystal display device having a horizontal scroll unit separates and stores image data output from a predetermined memory in a predetermined unit, and corresponds to display request information including horizontal scroll information or vertical scroll information. The image data separated in the predetermined unit is scrolled corresponding to the scroll information, and converted into an analog signal for the scrolled image data in synchronization with a row synchronization signal; Amplification to the actual liquid crystal panel drive signal is performed to output the final column signal voltage. Therefore, the image scrolling output from the memory such as SRAM is simply processed and applied to the liquid crystal panel without burdening the MPU, thereby performing a horizontal scrolling function to move the screen to the left and right.

Description

Liquid crystal display driver providing for horizontal scroll function and driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (hereinafter abbreviated as "LCD"), and more particularly to a driving device and a method of a liquid crystal display (LCD).

Liquid crystal displays (LCDs) are in the spotlight as new display devices in today's multimedia era. Liquid crystal display (LCD) is a device for displaying a variety of image information from text messages to moving images are used in various fields in the industry. In particular, liquid crystal displays (LCDs) are commonly used in digital displays such as personal computers and mobile communication terminals.

By the way, although a vertical scroll function is basically provided in a conventional liquid crystal display (LCD), a horizontal scroll function is provided in a limited manner due to difficulty in implementing a driving device. In particular, in a conventional super twisted nematic (hereinafter, referred to as "STN") liquid crystal display (LCD), which is used in a small size, such as a mobile communication terminal, a horizontal scroll from a user is provided to provide a horizontal scroll function. The MPU (main processing unit) of the driving device which receives the predetermined request information to be subjected to the scroll processing corresponding to the predetermined request information extracts horizontally shifted static random access memory (SRAM) data one by one, and then liquid crystals. It is carried out by applying to a panel. Such a drive device for a conventional STN liquid crystal display (LCD) is well described in Korean Unexamined Patent Publication No. KR2002-066243.

Accordingly, in order to perform a horizontal scroll function, a conventional drive device of a liquid crystal display (STN) liquid crystal display (LCD) has an MPU writes horizontally shifted data to an SRAM each time the horizontal scroll is performed, and newly extracts rows by row. Since it must be applied to the liquid crystal panel (panel), there is a problem of increasing the burden on the MPU.

Therefore, the technical problem to be solved by the present invention is when the image data is read from a predetermined memory such as an SRAM and applied to the liquid crystal panel, when the horizontal scroll request is requested from the user or when the image data itself needs to be horizontal scrolled. STN temporarily stores image data applied to the liquid crystal panel by row, and moves the image data stored in the register to the left and right to the liquid crystal panel to move the screen to the left and right. ) And a driving method of the liquid crystal display (LCD).

In order to achieve the above technical problem, a driving apparatus of an STN liquid crystal display (LCD) according to the present invention includes a main controller, a memory unit, and a horizontal scroll unit.

The main controller generates image data read information in response to the input display request information INS, generates display synchronization signals including a shift synchronization signal VS and a row synchronization signal, and controls overall control. Perform.

The memory unit stores one or more frames of image data, and outputs image data P0 to PN-1 row by row at an address corresponding thereto under the control of the image data read information.

The horizontal scroll unit separately stores the image data P0 to PN-1 output from the memory unit in a predetermined unit and corresponds to the display request information INS including horizontal scroll information or vertical scroll information. The image data P0 to PN-1, which are separated in the predetermined unit, is scrolled in synchronization with the shift synchronization signal VS, and the scroll process is synchronized with the row synchronization signal. Conversion of the image data into an analog signal and amplification of the analog signal into an actual liquid crystal panel driving signal are performed to output final column signal voltages D0 to DN-1.

The horizontal scroll unit includes a horizontal scroll control unit, a segment data storage unit, and a data output unit.

The horizontal scroll controller generates segment storage information in synchronization with the shift synchronization signal VS in response to the display request information INS.

The segment data storage unit separately stores the image data P0 to PN-1 output from the memory unit in the predetermined unit, and separates the image data P0 to PN-1 into the predetermined unit in response to the scroll information under the control of the segment storage information. The processed image data P0 to PN-1 are scrolled and output.

The data output unit converts the scrolled image data into the analog signal in synchronization with the row sync signal, and amplifies the analog signal into an actual liquid crystal panel driving signal for the final column signal voltage (D0 to DN). Output -1)

The display request information INS automatically scrolls from the row on which the display and display of the liquid crystal panel are started to the predetermined row, and automatically scrolls from the row on which the display and display of the liquid crystal panel are started to the predetermined row. The scroll information to repeatedly perform the function of performing the function between the row periods, or the scroll information to perform only the scroll function horizontally or vertically at the request of the user in the display state of the liquid crystal panel. It is done.

The segment storing information is information for horizontally moving the video data P0 to PN-1 separated by the predetermined unit with respect to the horizontal scroll information by a predetermined number of pixels, and with respect to the vertical scroll information, the predetermined unit. It is characterized in that the information does not scroll processing the image data (P0 ~ PN-1) separated by.

The horizontal movement is a movement to the left or the right of the display screen, and the segment data storage unit moves the data left and right during the horizontal scrolling in synchronization with the shift synchronizing signal VS. And a shift register for outputting the image data P0 to PN-1 received from the memory unit without moving the data. The predetermined unit is one pixel unit of the liquid crystal panel.

In accordance with another aspect of the present invention, there is provided a method of driving an STN liquid crystal display (LCD), which stores one or more image data according to input display request information (INS). A driving method of a liquid crystal display device which displays image on a screen by reading and processing image data from a memory and performs vertical and horizontal scroll functions, the method comprising the following steps.

That is, in the driving method of the STN liquid crystal display (LCD) according to the present invention, the liquid crystal display (LCD) firstly reads image data read information and shifts in response to the input display request information (INS). And generate display synchronization signals including the synchronization signal VS and the row synchronization signal. Next, the liquid crystal display (LCD) reads the image data P0 to PN-1 row by row from an address corresponding to the image data read information from the predetermined memory, and reads the read image data P0 to. PN-1) is separately stored in predetermined units. Subsequently, the liquid crystal display (LCD) generates segment storage information in synchronization with the shift synchronizing signal VS in response to the display request information INS including the horizontal scroll information or the vertical scroll information. Under the control of the segment storage information, the image data P0 to PN-1 separated by the predetermined unit is scrolled in response to the scroll information. Accordingly, the liquid crystal display (LCD) converts the image data scrolled in synchronization with the row synchronization signal into an analog signal, and amplifies the analog signal into an actual liquid crystal panel driving signal. The final column signal voltages D0 to DN-1 are output.

The display request information INS automatically scrolls from the row on which the display and display of the liquid crystal panel are started to the predetermined row, and automatically scrolls from the row on which the display and display of the liquid crystal panel are started to the predetermined row. And the scroll information to repeatedly perform the function of performing the function between the row periods and the scroll information to perform only the scroll function horizontally or vertically at the request of the user in the display state of the liquid crystal panel. do.

The segment storing information is information for horizontally moving the video data P0 to PN-1 separated by the predetermined unit with respect to the horizontal scroll information by a predetermined number of pixels, and with respect to the vertical scroll information, the predetermined unit. It is characterized in that the information does not scroll processing the image data (P0 ~ PN-1) separated by.

The horizontal movement is a movement to the left or the right of the display screen, and the scroll processing is synchronized with the shift synchronizing signal VS to move the data left and right during the horizontal scrolling and the data during the vertical scrolling. The shift register outputs the image data P0 to PN-1 received from the memory unit as it is without moving. The predetermined unit is one pixel unit of the liquid crystal panel.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a driving device of an styrene (STN) liquid crystal display (LCD) according to an embodiment of the present invention.

Referring to FIG. 1, a driving apparatus of an STN liquid crystal display (LCD) according to an exemplary embodiment of the present invention may include a main controller 110, a memory unit 120, and a horizontal scroll unit 130. Equipped.

The main controller 110 generates image data read information in response to the input display request information INS, generates display synchronization signals including a shift synchronization signal VS and a row synchronization signal, Perform overall control.

In this case, the display request information INS may include horizontal scroll information or vertical scroll information for automatically scrolling the display and the row from which the display is started to a predetermined row. In addition, the display request information INS may include the scroll information for repeatedly displaying the liquid crystal panel and performing a function of automatically scrolling from a row where the display is started to a predetermined row between the row periods. In addition, the display apparatus may include the scroll information for performing only the scroll function horizontally or vertically at the request of the user in the display state of the liquid crystal panel. In addition, the horizontal scroll information may include information about the number of pixels moved when the horizontal scroll.

The memory unit 120 stores one or more frames of image data, and outputs image data P0 to PN-1 row by row at an address corresponding thereto under the control of the image data readout information. The image data P0 to PN-1 refer to various types of data for a message, a still image, or a video displayed on a screen of a mobile communication terminal.

The horizontal scroll unit 130 separately stores the image data P0 to PN-1 output from the memory unit 120 in a predetermined unit and includes the horizontal scroll information or the vertical scroll information. In response to (INS), the image data P0 to PN-1 separated in the predetermined unit are scrolled corresponding to the scroll information in synchronization with the shift synchronizing signal VS. In addition, the horizontal scroll unit 130 converts the image data scrolled in synchronization with the row synchronization signal into an analog signal, and amplifies the analog signal into an actual liquid crystal panel driving signal to form a final column. Output signal voltages D0 to DN-1. The final column signal voltages D0 to DN-1 output here are applied to the liquid crystal panel and displayed as an image that the user can directly see.

FIG. 2 is a detailed block diagram of the horizontal scroll unit 130 of FIG. 1.

Referring to FIG. 2, the horizontal scroll unit 130 includes a horizontal scroll controller 131, a segment data storage unit 133, and a data output unit 135.

The horizontal scroll control unit 131 generates segment storage information in synchronization with the shift synchronization signal VS in response to the display request information INS including the horizontal scroll information or the vertical scroll information.

The segment data storage unit 133 separately stores and stores the image data P0 to PN-1 output from the memory unit 120 in the predetermined unit and is controlled to the scroll information under the control of the segment storage information. Correspondingly, the image data P0 to PN-1 separated by the predetermined unit is scrolled. Here, the predetermined unit is one pixel unit of the liquid crystal panel. The segment storing information may be configured to horizontally move (move to the left or right of the display screen) the image data P0 to PN-1 separated by the predetermined unit with respect to the horizontal scroll information by a predetermined number of pixels. The vertical scroll information is information which does not scroll the video data P0 to PN-1 separated by the predetermined unit. The information about the horizontal movement by the predetermined number of pixels is included in the horizontal scroll information as described above.

In this case, the vertical scrolling process is not performed by the segment data storage unit 133 during the vertical scrolling. As in a general case, the image data vertically shifted by the scrolling process of the main controller 110 is stored in the memory. This is because the image is read by the unit 120 and thus outputs the image data P0 to PN-1 received from the memory unit 120 without moving the data.

The segment data storage unit 133 is synchronized with the shift synchronizing signal VS to move data left and right during the horizontal scrolling and received from the memory unit 120 without moving the data during the vertical scrolling. The shift register may output the image data P0 to PN-1 as it is.

The data output unit 135 converts the scrolled image data into the analog signal in synchronization with the row sync signal, and amplifies the analog signal into an actual liquid crystal panel driving signal to obtain a final column signal voltage ( Output D0 ~ DN-1).

The operation of the liquid crystal display (LCD) including the driving device of the STN liquid crystal display (LCD) according to the embodiment of the present invention shown in FIG. 1 will be described in more detail.

FIG. 3 is a flowchart for describing an operation of a liquid crystal display (LCD) including a driving device of the STN liquid crystal display (LCD) of FIG. 1.

Referring to FIG. 3, the driving of a liquid crystal display (LCD) including a driving device of an STN liquid crystal display (LCD) according to an embodiment of the present invention is performed in the following steps.

That is, according to the display request information (INS) input, driving the liquid crystal display device to display the image data by reading and processing the image data from a predetermined memory storing one or more frames and to perform vertical and horizontal scroll functions. In the first embodiment, the main control unit 110 included in the driving device of the liquid crystal display receives input display request information (INS), that is, a command to display image information on a screen (S310). In response to the information INS, display synchronization signals including image data read information, a shift synchronization signal VS, and a row synchronization signal are generated.

Here, the image data read information includes various control signals for reading image data from the memory unit 120 including an address and the like. In addition to the shift synchronizing signal VS and the row synchronizing signal, the display synchronizing signals include a frame synchronizing signal and various clock signals necessary for driving. The row sync signal is a signal that is activated whenever the row lines of the liquid crystal panel are selected one by one, and the frame sync signal is a signal that is activated after every row line of the liquid crystal panel, that is, every frame. One frame frequency varies depending on the resolution or vertical driving frequency of the liquid crystal display, and usually ranges from 30 Hz to 80 Hz.

Next, the memory unit 120 included in the driving device reads the image data P0 to PN-1 one row at an address corresponding to the image data read information. The read image data P0 to PN-1 may be input to the horizontal scroll unit 130 (S320), and the segment data storage unit 133 provided in the horizontal scroll unit 130 may read the read image data P0. -PN-1 is stored separately in a predetermined unit, and the horizontal scroll control unit 131 corresponds to the display request information INS including the horizontal scroll information or the vertical scroll information. In order to generate the segment storage information. Accordingly, the segment data storage unit 133 horizontally or vertically scrolls the image data P0 to PN-1 separated by the predetermined unit in response to the scroll information under the control of the segment storage information. (S330).

Here, the predetermined unit is one pixel unit of the liquid crystal panel. In addition, the segment storing information is configured to horizontally move the video data P0 to PN-1 separated by the predetermined unit with respect to the horizontal scroll information by the predetermined number of pixels (movement to the left or right of the display screen). The vertical scroll information is information which does not scroll the video data P0 to PN-1 separated by the predetermined unit. In this case, the vertical scrolling process is not performed by the segment data storage unit 133 during the vertical scrolling. As in a general case, the image data vertically scrolled by the processing of the main controller 110 is stored in the memory. This is because the image is read by the unit 120 and thus outputs the image data P0 to PN-1 received from the memory unit 120 without moving the data.

On the other hand, the data output unit 135 receiving the scrolled image data (P0 ~ PN-1) is converted into an analog signal for the scrolled image data, and the actual liquid crystal panel drive signal for the analog signal The final column signal voltages D0 to DN-1 are output by amplifying (S340). The final column signal voltages D0 to DN-1 output here are applied to the liquid crystal panel and displayed as an image that the user can directly see.

The driving apparatus of the STN liquid crystal display (LCD) according to the exemplary embodiment of the present invention performs various scroll functions by changing the display request information INS. That is, the display request information INS may include the scroll information for automatically scrolling the display of the liquid crystal panel from a row where the display is started to a predetermined row. Alternatively, the display request information INS may include the scroll information for repeatedly displaying the liquid crystal panel and performing a function of automatically scrolling from a row where the display is started to a predetermined row between the row periods ( For example, periodically moving a message displayed on the screen to the left or right). In addition, the display request information INS may include the scroll information for performing only a scroll function horizontally or vertically at the request of the user in the display state of the liquid crystal panel.

As described above, the driving device of the STN liquid crystal display (STN LCD) according to the embodiment of the present invention includes a horizontal scroll unit 130, and the horizontal scroll control unit 131 is horizontal In response to the display request information INS including the scroll information or the vertical scroll information, when segment storage information is generated in synchronization with the shift synchronization signal VS, the segment data storage unit 133 is configured to generate the memory unit. The image data P0 to PN-1 output from the 120 are separated and stored in the predetermined unit, and the image data separated in the predetermined unit in correspondence to the scroll information are controlled under the segment storage information. Scroll through P0 to PN-1). Accordingly, the data output unit 135 converts the scrolled image data into the analog signal in synchronization with the row sync signal, amplifies the analog signal into the actual liquid crystal panel driving signal, and generates a final column signal voltage. Outputs (D0 ~ DN-1). The final column signal voltages D0 to DN-1 are applied to the liquid crystal panel and displayed as an image that the user can directly see.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the driving apparatus of the STN liquid crystal display (LCD) according to the present invention has a horizontal scroll request from the user or when the image data is read from a predetermined memory such as SRAM and applied to the liquid crystal panel. In the case where the data itself is automatically scrolled horizontally, image data applied to the liquid crystal panel may be temporarily stored in a register one row at a time, and the image data stored in the register may be moved left and right and applied to the liquid crystal panel. have. Accordingly, the horizontal scrolling function to move the screen to the left and right by simply processing image data output from a predetermined memory such as an SRAM and applying the same to the liquid crystal panel without burdening the control unit such as the MPU. .

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a driving device of an styrene (STN) liquid crystal display (LCD) according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of the horizontal scroll unit 130 of FIG. 1.

FIG. 3 is a flowchart for describing an operation of a liquid crystal display (LCD) including a driving device of the STN liquid crystal display (LCD) of FIG. 1.

Claims (19)

A main controller configured to generate image data read information in response to input display request information, generate display synchronization signals including a shift synchronization signal and a row synchronization signal, and perform overall control; A memory unit which stores one or more frames of image data and outputs image data one row at an address corresponding thereto under the control of the image data read information; A horizontal scroll controller for generating segment storage information in synchronization with the shift synchronization signal in response to the display request information including horizontal scroll information or vertical scroll information; Segmented data which separately stores and stores the image data output from the memory unit in the predetermined unit, and scrolls and outputs the image data separated in the predetermined unit in response to the scroll information under the control of the segment storage information. Storage unit; And And a data output unit configured to convert the scrolled image data into an analog signal in synchronization with the row synchronization signal, amplify the analog signal into an actual liquid crystal panel driving signal, and output the final column signal voltage. The segment storing information is information for horizontally moving the image data separated by the predetermined unit with respect to the horizontal scroll information by a predetermined number of pixels, and scrolling the image data separated by the predetermined unit with respect to the vertical scroll information. It is information which is not made, The drive apparatus of the liquid crystal display device characterized by the above-mentioned. delete The method of claim 1, wherein the display request information, And the scroll information for automatically scrolling the display of the liquid crystal panel from a row where the display is started to a predetermined row. The method of claim 3, wherein the display request information, And the scroll information for repeatedly displaying the liquid crystal panel and performing a function of automatically scrolling from a row where the display is started to a predetermined row between the row periods. The method of claim 1, wherein the display request information, And the scroll information for performing only a scroll function horizontally or vertically at the request of the user in the display state of the liquid crystal panel. delete delete The method of claim 1, wherein the horizontal movement, A drive device for a liquid crystal display device, characterized by moving to the left or right side of the display screen. The method of claim 1, wherein the segment data storage unit, And a shift register synchronized with the shift synchronizing signal to move data left and right during horizontal scrolling and to output image data received from the memory unit without moving data during vertical scrolling. Driving device. The method of claim 1, wherein the predetermined unit, A drive device for a liquid crystal display device, characterized in that one pixel unit of the liquid crystal panel. A driving method of a liquid crystal display device which performs a vertical and horizontal scrolling function by displaying image data on a screen by reading and processing image data from a predetermined memory storing one or more frame data according to input display request information. Generating, by the liquid crystal display device, display synchronization signals including image data read information, a shift synchronization signal, and a row synchronization signal in response to the input display request information; Reading out image data row by row from the predetermined memory at the address corresponding to the image data read information from the predetermined memory; Separately storing the read image data by a predetermined unit by the liquid crystal display; Generating, by the liquid crystal display, segment storage information in synchronization with the shift synchronizing signal in response to the display request information including the horizontal scroll information or the vertical scroll information; Scrolling, by the liquid crystal display, the image data separated by the predetermined unit in response to the scroll information under the control of the segment storing information; And The liquid crystal display converts the image data scrolled in synchronization with the row synchronization signal into an analog signal, and amplifies the analog signal into an actual liquid crystal panel driving signal to obtain a final column signal voltage. And outputting the liquid crystal display device. The method of claim 11, wherein the display request information, And the scroll information for automatically scrolling the display of the liquid crystal panel from a row where the display is started to a predetermined row. The method of claim 12, wherein the display request information, And the scroll information for repeatedly displaying between a row section and a function of automatically displaying a liquid crystal panel and scrolling from a row where the display is started to a predetermined row. The method of claim 11, wherein the display request information, And the scroll information for performing only a scroll function horizontally or vertically at the request of the user in the display state of the liquid crystal panel. The method of claim 11, wherein the segment storage information, The horizontal scroll information is information for horizontally moving the image data separated by the predetermined unit by a predetermined number of pixels. The method of claim 11, wherein the segment storage information, The vertical scroll information is information which does not scroll the image data separated by the predetermined unit. The method of claim 15, wherein the horizontal movement, A method of driving a liquid crystal display device, which is a movement to the left or the right of the display screen. The method of claim 11, wherein the scroll processing, In response to the shift synchronizing signal, a shift register for shifting data to the left and right during the horizontal scroll, and outputting the image data received from the memory unit without moving the data during the vertical scrolling; Driving method of liquid crystal display device. The method of claim 11, wherein the predetermined unit, A driving method of a liquid crystal display device, characterized in that one pixel unit of the liquid crystal panel.