TW594125B - Liquid crystal display device, computer apparatus, and drive control method of LCD panel thereof - Google Patents

Abstract

To lower an operating frequency of a LCD panel and to actually reduce power consumption by shortening a frame period for redrawing image display in the LCD panel. A LCD (liquid crystal display) device according to the present invention includes a LCD panel 11, and a graphic controller 13 which controls display in this LCD panel 11, and this graphic controller 13 shortens a frame period with fixing a refresh rate by shortening a non-display period at the time of redrawing an image when the power consumption is suppressed.

Description

594125 A7 B7 V. Description of the Invention (1) [Field of Invention] The present invention relates to driving control of a liquid crystal display panel in a liquid crystal display element, and a computer device using the driving control. [Background Art] So far, notebook personal computers (hereinafter referred to as PC) having a small space and convenient carrying characteristics have been quite popular. The display of these notebook PCs is mainly LCD. Generally, such LCDs (liquid crystal displays) form an image visual effect on the liquid crystal surface of the LCD panel as follows: arrange a backlight (which is a surface light source for illumination) on the back of an LCD panel (which is a display screen), And a liquid crystal surface having a predetermined range is irradiated with uniform brightness. In addition, in the notebook PC, in addition to the AC (AC) power supply, when used in action, DC (DC) power is also used as the power supply. Therefore, the notebook PC is designed to be driven by a DC battery. [Problems to be Solved by the Invention] To be clear, when DC power is used, extending the continuous driving time of DC batteries has always been a technical target to be broken. To achieve this, efforts must be made to reduce the power consumption of the various parts of p C. Similarly, when using a DC power supply, the LCD must also reduce power consumption. Compared with using an AC power supply, it must automatically reduce the LC: D panel exemption ’and reduce the operating frequency (basic clock). In addition, when a picture is displayed on the L c D panel, the driving mode of the L c D panel is as follows: the picture must be redrawn a predetermined number of times per second. The driving frequency at this time is called the update rate (vertical synchronization frequency). Here, the update speed-4-594125 A7 B7 V. Invention description (2 rate is very close to the operating frequency. Basically, the operating frequency is determined by the LCD update rate. For example, when driving the LCD panel When the update rate is 50 Hz and the display resolution is 14000 × 1050 points, the operating frequency is 90 MHz. Similarly, when the LCD panel is driven at an update rate of 60 × ζ, its operating frequency is It is ι〇8 MHz. Therefore, if only the operating frequency is reduced, the update rate of the L c 〇 panel will also be reduced accordingly. Therefore, if the operating frequency is drastically reduced, a fairly obvious flicker will appear on the screen In addition, I know that reducing the brightness of the LCD panel according to the update rate of the LCD panel can make the flicker in the screen less obvious. However, reducing the brightness of the LCD panel and reducing the visibility of the screen Will

k-difference ', so using this method to reduce the update rate of the LCD panel will also be limited. H On the other hand, the better the continuous driving time of the better DC battery, the better, but it is necessary to further reduce the power consumption. The present invention is made in response to this technical goal, and its goal is to further reduce the power consumption of PC DC. [Summary of the Invention] The present invention can achieve the above-mentioned objective, which can reduce the operating frequency of the LCD panel by shortening the frame period for redrawing the image display in the LCD panel, so as to reduce the power consumption. 8. The L c D element which can achieve this goal according to the present invention is characterized by including an L C D panel; and an image controller, which is intended to reduce power consumption.

Binding

594125

It can be used to control the display of the LCD panel and use a fixed update rate to shorten the frame period. In more detail, the image controller can shorten the frame period by reducing the non-display period when redrawing the image. In addition, when it is desired to control any one of the plurality of LCD panels, the image controller shortens the non-display period in a range where the plurality of LCD panels can operate. Furthermore, the image controller can shorten at least one of the horizontal non-display period of the image redraw and the vertical non-display period of the image redraw individually. In addition, another L c D according to the present invention is characterized in that it includes an LCD panel; and an image controller for controlling the display of the LCD panel, wherein the image controller is used to redraw the period of the image Including: the display period equivalent to the display resolution of the LCD panel, and the non-display period shorter than the standard value. Here, the image controller has the identification information of the controlled LCD panel, and the period for redrawing the image includes a non-display period shortened in a range in which the LCD panel specified by the identification information can operate. There is another LCD device, which is characterized by including an LCD panel; and an image controller for driving the LCD panel, wherein the image controller drives the LCD panel under the following conditions: · The operating frequency set according to the preset update rate, and the replacement cycle is shorter than the standard value in the range that the LCD panel can operate. Here ', this image controller drives the L c d panel under the following conditions. The operating frequency is set based on shortening the image replacement period shortened by the non-display period when the image is redrawn. -6-The paper size is suitable for domestic use (CNS) A4 specification (21GX297 public love) 4 ^ 5?

594125 A7

Furthermore, the present invention can also be implemented as a computer device using the above-mentioned LCD as an output member. Therefore, the computer device is equipped with an LCD (liquid crystal display) panel as a display element, which is characterized by: a timing table, which is registered to drive the timing parameters of the LCD panel; and M and a drive controller, The timing parameters in the timing table drive the LCD panel. Among them, the first timing parameter is set to a standard value, and the second timing parameter is green in the timing table. By shortening the frame period of the image display, Reduce operating frequency. Here, the = drive_component drives the LCD panel according to the second timing parameter when the battery is used as the power source for driving. In addition, the second timing parameter shortens the frame period to reduce the operation frequency in the range where the plurality of LCD panels to be used can operate. The structure of the computer device further includes a timing parameter generating unit for obtaining identification information of the LCD panel, generating a second timing parameter in a range that the lc and d panels can operate specified by Xiao identification information, and The two timing parameters are registered in the timing table. This timing parameter generation component will obtain the EDID (Extended Display Identification Data) of the LCD panel as identification information. In addition, the present invention is a driving control method of an LC D panel, which is characterized by including the following steps: detecting the material, that is, the LCD panel becomes an operating state in which power consumption must be reduced; and the LCD is fixed when the event is detected. The panel update rate reduces the frame period of the image display. In more detail, the LCD panel driving control method shortens the non-display period by redrawing the image in the LCD panel to shorten the information.

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Box cycle. Furthermore, the present invention is characterized in that it includes the following steps: obtaining the identification information of the LcD (liquid crystal display) panel; generating the timing parameters, and shortening the image display by the operating range of the LCD panel specified by the obtained identification information; Frame cycle to reduce the operating frequency; and drive the LCD panel according to the generated timing parameters. In addition, the present invention can also be implemented as a program (for example, bios), which is also known to perform a driving control method of some LCD panels. This program can be stored in distributed storage media, such as magnetic disks, optical disks, or semiconductor memory, or provided through the network. [Preferred Embodiment] The present invention will be described in detail with reference to specific embodiments shown in the drawings. In addition, in these specific embodiments, although the present invention is applied to the aforementioned notebook PC as an example, the present invention can of course be applied to a desktop PC equipped with an LCD as a display member. [Embodiment 1] FIG. 1 is a schematic structural diagram for explaining a notebook PC as a computer device in the first embodiment. In FIG. 1, a notebook PC according to this embodiment is provided with an LCD element 10 and a PC main body 20. The LCD element 10 includes an LCD panel π, in which signal lines, gate lines, and other elements are stacked, such as a TFT (thin film transistor) (in which an amorphous stone layer and the like are formed) and a color filter. And then

Binding

594125 A7 B7 V. Description of the invention (6 will further fill the liquid crystal, and a display curtain is constructed between the two glass substrates. The backlight 12 is located on the back of the LCD panel 11 and serves as a light source to emit flat light for illumination. Next 'An image controller 1 3 will be provided in the LCD panel 11 to control the display screen' The image controller 13 includes a frequency control unit 14 to control the update rate of the LCD panel 11. In addition, the backlight 12 is equipped with a backlight controller 15 to control the intensity of the light source. The PC main body 20 includes a CPU 21; a nonvolatile memory 2 2 for storing preset data; and is connected to the PC main body. The event controller 23 of 20 is used to monitor the event input of each element and output events to each element as a component of display control of the LCD panel 10. In addition, the system shown in FIG. 2 is used to explain Schematic diagram of the software structure for driving control of [c D element 10 in the notebook p of FIG. I. In FIG. 2, the application program 11 will be stored in a storage body (such as a magnetic disk) equipped with the notebook PC. And load it The CPU 21 can access the main memory to control the CPU 21. Then, the application program will output a command to reduce the operating frequency by the method of the specific embodiment described later to reduce the power consumption of the LCD element 10. And let L (: d element μ operate in the power saving mode. Here, when it is detected that the LCD element 10 has become an operating state that must reduce power consumption, the application program 110 will output a command through the event controller 2 3 Can also detect the specific input of the user: the event of the industry, or the event that the LCD element 10 is in a specific operating private environment (for example, when the operating environment is detected at startup, DC battery driven). The command output by the application 11 can make the video 594125 A7 B7 V. Description of the invention (BI0S (Basic Input / Output System) 130 processing through the interface (API) layer 120. Video BIOS 130 is stored in In the non-volatile memory 22, and by controlling the CPU 21 to control the operation of the image controller 1 3. In addition, the video BIOS 130 has a timing table 31, according to which timing parameters can be determined, such as the operating frequency Update rate, display period and non-display period (blank period) of the video replay, and send them to the image controller 1 3. Therefore, the image controller 13 can drive lc D according to the received timing parameters The panel binding LCD element 10 constructed in this way can be displayed on the LCD panel 11 under the control of the image controller 13 according to the data transmitted by the PC body 20. At the same time, the image controller 丨The frequency control unit 14 of 3 drives the LCD panel 11 at a preset update rate, and redraws the display screen at a preset number of times per second. In addition, the backlight controller 15 that controls the light source intensity of the backlight 2 sets the brightness of the display screen of the LCD panel 1. The update rate and brightness setting of the line L · CD panel 1 1 are stored in the non-volatile memory 2 2 'and when the memory PC is turned on, it is stored in the non-volatile memory by reference. The set point in 2 2 can set the update rate and brightness of the LCD panel 11. In this embodiment, the power consumption of the LCD element 10 can be reduced by reducing the operating frequency of the LCD panel 1. Here, if only the operating frequency is reduced, the update rate of the L · C D panel 11 will also decrease accordingly, and therefore, a considerable flicker will occur. To prevent this from happening, -10-

44! V. Description of the invention (8 In this specific embodiment, it reduces the non-display week-month and reduces the operating frequency when redrawing on the image, but it is not suitable. LCD panel! The update rate of i. Will be explained in detail later. = The period required to redraw the image (hereafter referred to as the replacement period):; jc Hsync, and horizontal display 128 o points make the image display status (de 1) of the replacement cycle of D panel 1 丨. Here, the replacement cycle claimed in HSync is equivalent to the recheck: the cycle required for the secondary image, also That is, the age at which the operating frequency is specified

Number of clocks. In addition, the state of the display unit in the display unit (DE 1) shows the display period and the non-display period in the LCD panel 11. As shown in Fig. 3, in DE1, a display period of 128 dots depends on a non-display period of dots, so there are 1688 dots in total. That is, in this L C D panel 1 1, if the clock signal of the specified operating frequency is to be horizontal

To redraw an image line in the gimbal, it is necessary to have enough clocks to control the display of 1688 points. "T Here 'the non-display period represents the period inserted when the image is replaced, and the image will not be displayed in it. Although a CRT display element is used as a display element, this timing parameter must be present, but when the = When the LCD is used as a display element, this parameter may not be necessary. However, because the CRT and LCD are currently the main display of a PC, the non-display period will still be provided to maintain interchangeability with the CRT display element. In the notebook PC, in addition to the LCD element 10, in order to be able to use an external display (including CRT display elements), some will have two CRTC (CRT controller) in the image controller 13 ) As 594125 A7 B7 frequency control unit 14. In this case, when using CRTC that controls the L c D component process 0, it is not necessary to provide a non-display period suitable for the .rt display element. Because there is no need to consider the interchangeability with the c RT display element. For example, in the LCD PC 1 of the notebook PC, 14 0χ 1 can be achieved by changing the non-display period. The resolution of 50 points. The system shown in DE 2 in Figure 3 is to change the display period and non-display period rate in one Hsync cycle to achieve the state of horizontal resolution of 4,000 points. Refer to this figure Formula, the Hsync period is fixed at 1688 points, and by reducing the standard non-display period of 408 points to 288 points, a display period of μ㈧ points can be generated. The same is done for the vertical replacement period. The operation shortens the non-display period, and the resolution of 14000 × 1050 points can be obtained without changing the operation frequency and update rate. In addition, although it is mentioned in this article, if the L c D element is used as the display element, it will not When a CRT display element is used, the image controller] 3 can have two CRTCs, but the same control can be performed even if the image controller 3 has only one CRTC. According to this method, when the display to be used is When the element is limited to L c D element ^ 〇, it is not necessary to consider the exchangeability with the c R τ display element, so the non-display period in the image replacement cycle can be enlarged or compressed ^ This can be considered as a utilization Set update rate in order to reduce the frequency of operation. Department of a table shown in FIG. 4, for explaining the same panel L c d [eta] (resolution 1400 X 1050 dots) decreases during its operation frequency concept.

Binding line-12- 594125 A7 B7 V. Description of the invention (10. In Fig. 4, column 1 shows the original operation mode of the L c D panel 11 (remaining interchangeable with the C RT display element) Operation mode). That is, when the LCD panel 11 is driven with a resolution of 1280 X 1024 points and an update rate of 60 Hz, its horizontal non-display period is 408 (1688-1280) points and its vertical non-display period is 44 (1068-1〇24) lines, and the operating frequency is 108 MHz. As shown in DE2 of Figure 3, the system shown in column 2 only improves the resolution without changing the operating frequency and update rate. That is, when the LCD panel 1 1 is driven at a resolution of 1400 X 1050 points and an update rate of 60 Hz, its operating frequency remains at 108 MHz, but the horizontal non-display period is 2 8 8 (1688-1400 ) Points, the vertical non-display period is 8 (1068-1050) lines. The system shown in column 3 only reduces the operating frequency as a guide to shorten the non-display period of this specific embodiment to reduce the operating frequency. Phase operation mode. That is, when the LCD is driven with a resolution of 1400 X 105 points At panel 1 1 ', the horizontal non-display period is 2 8 8 (1688-1400) points, and the vertical non-display period is 1 8 (1068-1050) lines. Because the update rate is reduced to 50 to 40 Hz, the job The frequency becomes 90 to 72 MHz. Here, because the update rate and operating frequency values vary depending on the type (manufacturer or model difference) of the Lc D element, the values described in column 3 are variable. In addition, I assume that reducing the brightness of the LCD panel 1 丨 and reducing the update rate at the same time can reduce the flicker of the screen. No problem, because reducing the brightness of the LCD panel 1 1 'the visibility of the working screen will become worse', so using this method to reduce 13-

594125 A7

V. Description of the invention The low operating frequency will also be limited. Although it is a very subjective feature that the visibility is affected by the flicker and the decrease in the ancientness of the screen, in general, the update rate of 50 to 40 Hz described in column 3 is the limit. A row 4 indicates an operation mode when the operation frequency is further reduced from the state of FIG. 3 by shortening the non-display period of this specific embodiment. That is, the horizontal non-display period is reduced to 3 (1430-1400) points, and the vertical non-display period is reduced to 3 (1053-1050) lines, and the 14000 × 1050 points are maintained. Resolution and update rate of 50 to 40Hz are reached, so the operating frequency will be reduced to 75 to 60 MHz. The method of reducing the operation frequency by shortening the non-display period will be described in further detail later. The horizontal synchronization sequence (Hsync ^ and Hsync2) of the image replacement cycle shown in FIG. 5 and the image display status (de3, 4) 'in the replacement cycle correspond to the operation modes of columns 3 and 4 in FIG. In FIG. 5, DE3 corresponds to the operation mode of column 3, and OE4 corresponds to the operation mode of column 4. As shown in FIG. 5, in DE 3, the display period has 4 00 points, and the non-display period has 2 88 points. Therefore, one Hsync 1 cycle has a total of 1688 points. This total length is the same as DE 1 and DE 2 in FIG. 3. In DE4, there are 1400 points in the display period, but there are only 30 points in the non-display period. Therefore, there are 1,430 points in one Hsync 1 period. Shortened; the total length of the image replacement cycle (ie, the number of clocks required to re-image one of the lines in the horizontal direction), but the display cycle is not changed. This is the same as the vertical display, so it means that if it is fixed to represent the shadow -14- This paper size applies the Chinese National Standard (CNS) A4 specification (21〇 X 297 mm)

Binding 594 125 A7 B7

V. Description of the invention (12 If the update rate of the image redrawing frequency, the operating frequency will be reduced. In this way, by shortening the non-display period when the image is redrawn, and maintaining the display resolution of the LCD panel 11, you can Only the operating frequency of the lCD panel u is reduced, but the update rate is fixed. The power consumption of the L c D element 10 can be reduced. In addition, in the above example, although the system resolution is 14000 ^ 1050 Point LCD panel 1 1, but of course the same operation can also be applied to LCD panels 11 of different resolutions. Furthermore, the method of reducing the operating frequency by shortening the non-display period in this specific embodiment can also be applied to the update In the state of the LC panel with a frequency of 60 Hz, the method according to this embodiment can also be applied to a state with a resolution of 1280 X 1024 points. Again, in the above example, although This method reduces the operating frequency to near the bottom line by reducing the horizontal non-display period 4 to 30 points and reducing the vertical non-display period to 3 lines, but it is also possible to This is used to reduce the setting value of the narrow range of operating frequency. For example, if the horizontal non-display period is 200 (MOO-14 ^) points and the non-display period is i 2 (丨 〇62 -1 〇5〇) lines, the update rate may be 50 to 40 Hz 'and the operating frequency is 85 to 68 MHz. Use 乂 to reduce the power consumption of the L c D element 10 according to the specific embodiment described above. The method can be implemented in the notebook PC shown in Figures 1 and 2. In the first step, in addition to the operation control parameters during normal operation, the parameters in the private mode are also registered in the non-volatile memory. 2 In the timing list 131 of the video BIOS 130 in 2 2. For example, if [⑶ panel-15 10X297 ^^ 7 446 594125 A7 B7

If the display resolution of 1 1 is 1400 x 1050 points, the information described in column 2 of Fig. 4 can be registered as the operation control parameters during normal operation. In addition, for example, the information described in FIG. 4 column 4 can be registered as a parameter in the power saving mode. In the initial state, the video BI0S 130 executes the job control of the image controller [3] according to the job control parameters during the normal job that is green in the timetable ΐ3ι. Therefore, the image controller 3 will drive the LCD panel 11 at the initial operating frequency and update rate. When the operating state becomes necessary to reduce power consumption (for example, when the power supply is switched to a DC battery), the application 11 will detect this state and output a command to allow the PC to operate in the power saving mode. under. After receiving the command, the video 〇8 i30 will refer to the timing table 131, and perform the job control of the image controller 3 according to the parameters in the power saving mode. Therefore, the image controller 3 drives the L c D panel 11 at a lower operating frequency in the power saving mode, and redraws the image at a corresponding update rate and replacement cycle. In addition, the method of reducing the update rate described in FIG. 4 and column 3 can also be used at this time. In this case, the backlight controller 15 can be used to drive and control the backlight 12 to reduce the brightness of the LCD panel 1 and reduce the flicker in the screen. In addition, if the operating frequency is reduced when the update rate is fixed, the range will depend on how much time can be shortened during the non-display cycle. Here, although the non-display period can be shortened to zero in theory, in reality, there is a fixed reduction limit due to the relationship between the display capability of the LCD panel 11 and the total processing capability of the image controller 13. Then, because of the currently used 16-paper ruler_ Jia Pi (CNS)-594125 A7 ------- One B7 V. Description of the invention (i) ~-Differences in I c circuit structure Therefore, this value will change with the type of the L c D panel. Next, regarding the operation frequency control of the plurality of LCD panels 11 according to this specific embodiment, the specifications of the horizontal and vertical replacement periods (Hsync and Vsync) and the possible minimum value of the non-display period will be compared. In addition, a value that can be found in all L c d panels 11 and can reduce the operating frequency to the maximum is defined as a representative specification, and can be registered in the timing table 131. Therefore, operation control can be performed in the power saving mode of all the LCD panels n. The table shown in FIG. 6 compares the representative specifications obtained after the four [c d panels 1 1 (ie, LCD-A to LCD_D). Regarding the specifications of the LCD panel 1 i and the image controller i 3, the minimum, standard, and maximum values of the vertical and horizontal replacement cycles shown in FIG. 6 and the minimum, standard, and maximum values of the operating frequency are shown. In addition, Fig. 6 also shows the non-display period, leading edge and trailing edge in the minimum value of the replacement period. Referring to FIG. 6, in the vertical direction, the specified efficiency of LCD_D is the lowest. In addition, the LCD-A's specified performance is the lowest in terms of the minimum possible replacement cycle and non-display cycle in the horizontal direction. In terms of leading edge and trailing edge, LCD-D's specified performance is the lowest. Therefore, by selecting these values, the representative specifications can be defined, and then the operating frequency in the power saving mode can be determined according to the representative specifications. As shown in Figure 6, I can see that because the determined operating frequency is greater than the LCD-A value with the largest possible minimum operating frequency, it can be found in all L · CD panels 1 1 Power saving mode set by operating frequency.

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594125 V. Description of Invention

[Specific Embodiment 2] Next, a specific embodiment which will be described is driving control of individual set values of a liquid crystal display corresponding to a plurality of L c D panels 丨 丨. Fig. 7 is a block diagram for explaining a schematic configuration of a notebook PC as a computer device in the second embodiment. FIG. 8 is a flowchart for explaining a software structure for driving control of the LC component of the notebook PC of FIG. 7 < Note PC. The same components in Figs. 7 and 8 as those of the first embodiment shown in Fig. 丨 have the same reference numerals and will not be explained again. Referring to FIG. 7, the notebook PC in this embodiment is different from the first embodiment in that the notebook PC is equipped with an L c D panel identification unit 72, which makes the image controller 7 丨 recognizable. Each [c D panel 11 °] Furthermore, in the specific embodiment shown in FIG. 8, the system BI0s 140 will find the L c D panel according to the recognition result of the LCD panel identification unit 72 to execute the video BIOS The required setting in 130. Regarding the technology for identifying a specific LCD panel 11, the EDID (Extended Display Identification Data) originally assigned to the LCD panel 11 or the unique I 0 (identification data) unique to each LCD panel 11 to be used can be used. Although it is often necessary to read and use the EDID stored in the memory provided with the LCD panel 11 when using the EDID, the memory storing the EDID can be located in the LCD panel 11 and the LCD panel identification unit 7 Anywhere between 2. In addition, the memory can also be placed in the image controller 71, or a small substrate can be inserted and installed in a line connecting the LCD panel 11 and the image controller 71. Note-18- This paper size applies to China National Standard (CNS) A4 specification (210X 297mm) 44¾ A7 B7 V. Description of the invention (16) Memories. When the id unique to each LCD panel 11 is assigned, the high-level and low-level signals can be assigned to each LCD panel 1 in the ID identification leads of the LCD panel 11 to provide D to the LCD panel.丨 1. In this case, 'for example, if the number of the LCD panel 1 to be used is two,' only one bit of information is sufficient for identification. In addition, if one of the signal lines in the line connecting the LCD panel 11 and the image controller 7 is used for ID identification, the high-level and low-level signals in the signal line can also be used to provide IDs to the LCDs. Panel 11. Furthermore, 'the memory of the unique I 〇 is stored at an arbitrary position (for example, the line connecting the LCD panel 11, the image controller 71, and the line connecting the LCD panel 11 to the image controller 71), and Each LCD panel 11 can be identified by each ID stored in the memory. In this specific embodiment, it is the same as the first specific embodiment. By shortening the non-display period in the replacement period of the image displayed on the LCD panel 11, the operating frequency of the LCD panel 11 is reduced. Reduce the update rate 'to reduce power consumption. Here, as described above, the possible value of the non-display period to be shortened varies depending on the type of the LCD panel 11. According to this specific embodiment, by identifying the type of the specific L c D panel 1 1 to be used ', the most effective Angstrom mode can be realized according to the specified performance of the L C D panel 11. For example, when the four LCD panels 11 shown in FIG. 6 are used, since the power saving mode that can be realized in all the L c D panels 11 has been set in the first specific embodiment, among various parameters, Can be used with a minimum of -19- This paper size applies to Chinese National Standard (CNS) A4 specifications (210 X 297 mm) 594125 A7

The value of the LCD panel U with the specified performance defines the representative specifications, and the operating frequency in the power saving mode can be determined according to the representative specifications. However, the specified performance of LCD-B and LCD-C in all parameters exceeds the representative specifications; LCD_A and LCD_D will exceed the representative specifications in some parameters. Therefore, by identifying each LCD panel u and individually determining the operating frequency in the power saving mode suitable for the specified performance, the power consumption of each LCD panel 11 can be reduced to the maximum extent. In addition, in order to individually set the operating frequency in its power saving mode according to each type of LCD panel, it is not enough to identify each type of LCD panel, and it is necessary to obtain the specifications related to each of the LCD panels to be used. = News. Next, as shown in FIG. 6, it is understandable that I can make a table of information related to the specifications of all LCD panels 1 1 and store the table in the memory of the PC body 20 to facilitate the acquisition according to the obtained information. Edid and ID refer to the relevant table in order to set the operating frequency that can reduce power consumption to the maximum extent. In this case, although the related tables can be stored in the non-volatile memory 22 that stores the video BIOS 130 and the system BIOS 140, the storage capacity of the non-volatile memory 22 is usually very small. Therefore, Preferably, a memory is additionally provided for storing the above table. In addition, various information can also be obtained from the EDID, such as the operating frequency, update rate, and non-display period of the LCD panel 11 during normal operations. Therefore, only the difference values and formulas in the power saving mode from these values can be stored in the non-volatile memory 2 2, and then according to the information in the EDID obtained from the LCD panel 1 1 Calculate the operating frequency and non-display period in the power saving mode. -20- Extremely $ paper size applies to China National Standard (CNS) A4 specifications (210 X 297 public love) 594125

Fig. 9 is a flowchart for explaining the operation of this embodiment during the startup of the notebook PC. Here, an example will be described in which the EDID is read from the memory of the L c D panel 1 1 and the operation of one of the LCD panels 11 is identified. As shown in FIG. 9, after the PC is turned on (step 901), the system BI 0s 14 0 transmits a command for identifying one of the LCD panel 11 to the video BIOS 130 (step 902). The video BIOS 130 receives the command to control the LCD panel identification unit 72 of the image controller 71, and obtains ^ 1) 113 of the specific LCD panel 11 from the memory of the lcd panel 11 and transmits the remote EDID to the system. BIOS 140 (step 903). The system BIOS 140 will indicate the type of the specific LCD panel 1 1 according to the received EDID, so as to determine various parameters that can reduce the power consumption of the specific LCD panel 1] to a maximum extent, such as operating frequency and non- The period is displayed (step 904). Then, the determined value can be registered in the timing list of the video BIOS 130, 3 i, and used as a parameter in the power saving mode (step 905). In this way, when the PC is turned on, The recognition result of the specific L c D panel 11 determines the parameters for performing job control in the power saving mode, and registers them in the time sequence table 13 i of the video BI 0s 13o. Next, as in the first specific embodiment, in the initial state, the job control of the image controller 71 is performed based on the job control parameters at the time of the job. Then, according to the command sent from the application program, the job control of the image controller 71 can be performed according to the parameters in the power saving mode. As mentioned above, in the first and second specific embodiments of the present invention, only the figures ^ -21-

Binding

Line 594125 A7 ______B7 V. The note PC structure of the invention description (19) and 7 serves as a hardware example of these specific embodiments. Therefore, it is of course possible to adopt any structure other than the structure derived from the gist of the present invention. For example, although the structure of the L c D element in FIG. 1 and FIG. 7 includes image controllers 3 and 7 i, the image controllers 13 and 71 may also be included in the Pc main body 2. In. In addition, as described above, the above-mentioned first or second embodiment can also be applied to a desktop PC equipped with an LCD element i 0 and the like as a display element. In addition, in the first and second embodiments described above, although the non-display period of horizontal and vertical scanning is shortened when the image in the LCD panel 11 is redrawn, it is also possible to shorten the non-display period. Reduce operating frequency to reduce power consumption. Therefore, by reducing the horizontal non-display period and the vertical non-display period independently when redrawing the image, the degree of power consumption reduction can also be controlled. [Advantages of the Invention] As described above, according to the present invention, the update rate of the LCD panel of the LCD can be fixed to reduce the operating frequency. Therefore, the power consumption can be effectively reduced without causing flicker in the screen. In addition, when the pc is driven by a DC battery, the continuous driving time can be extended. [Brief description of the drawings] FIG. 1 is a schematic diagram for explaining the general structure of a notebook PC as a computer device in the first embodiment; FIG. 2 is a diagram for explaining the first embodiment. Schematic diagram of software structure for drive control by L c D; -22 ·

This paper is suitable for size_household ^ rNS) A4 size (21GX 297 male sauce) 594125 A7 B7 V. Description of the invention (20) The timing sequence of the image replacement cycle in the horizontal direction of the LCD panel shown in Figure 3, Image display status in this replacement cycle; Figure 4 is a table to explain the conceptual process of reducing the operating frequency of the CD panel; Figure 5 is the image replacement cycle in the horizontal direction of the CD panel The synchronization sequence and the image display status in the replacement cycle correspond to the operation modes of columns 3 and 4 in FIG. 4; the table shown in FIG. 6 compares four representative specifications obtained after the CD panel; FIG. 7 is a diagram for explaining the general structure of a notebook PC as a computer device in the second embodiment; FIG. 8 is a diagram for explaining the drive control of [c D in the second embodiment. Schematic diagram of the software structure; and the flowchart shown in Figure 9 is used to explain the operation of the specific embodiment during the startup of the notebook PC. -23-This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm)

Claims (1)

594125 A8 B8 C8 1. An L c D (liquid crystal display) element, comprising: an LCD panel; and an image controller, when the power consumption of the LCD panel is to be reduced, the frame period of the monitor is at a fixed update rate. It can be used to shorten the image display in a controlled manner. 2. For example, the LCD device in the scope of patent application No. 1 can shorten the non-display period when redrawing the image. Among them, the image control cycle is to shorten the LCD element of the second frame of the patent application scope. When the image controller wants to control any one of the plurality of LCD panels, the image controller will In the example cycle in which the plurality of LCD panels can be operated. ·, 4. The LCD element of the second patent application range 'wherein the image controller shortens at least one of the non-display period of the horizontal redrawing of the image and the non-display period of the vertical border of the image. 5. An LCD (liquid crystal display) element, comprising: an LCD panel; and an image controller for controlling the display of the LCD panel, wherein a period of the image controller for redrawing an image includes: The LCD panel displays a display period of resolution; and a non-display period shorter than a standard value. 6. The LCD element according to item 5 of the scope of patent application, wherein the image controller has identification information of which LCD panel is to be controlled, and the period for redrawing the image includes the LCD panel designated by the identification information. -24- This paper size applies to Chinese national standards ((: ^ 3) A4 size (210X297 mm) Binding • Line D8 VI. Patent application scope Shortened non-display cycle in the range that can be used for work. 7. LCD (liquid crystal display) element, comprising: an LCD panel; and an image controller for driving the MLCD panel, wherein the image controller drives the LCD panel under the following conditions: The operating frequency set by the update rate and the replacement cycle shorter than the standard value in the range in which the LCD panel can operate. 8 · An LCD (liquid crystal display) element, wherein the image controller drives the LCD panel under the following conditions: set according to shortening the image replacement period shortened by the non-display period when the image is redrawn frequency. 9. A computer device comprising an LCD (Liquid Crystal Display) panel as a display 7F element, which includes: a timing table registered with timing parameters for driving the LCD panel; and a driving controller for registering according to the timing with registration The timing parameters in the table drive the LCD panel. Among them, the first timing parameter is set to a standard value, and the second timing parameter is registered in the timing table. By reducing the frame period of the image display, the operating frequency is reduced. . 10. The computer device according to item 9 of the scope of patent application, wherein the drive controller drives the LCD panel according to the second timing parameter when the battery is used as the power source for driving. 11. If the computer device of the 9th scope of the patent application, the second timing parameter registered in the timing table will shorten the frame period, and the paper standard applies to China National Standard (CNS) A4 Specifications (210 X 297 public love) 594125 6. Reduce the operating frequency in the range where the multiple LCD panels that can be patented can work. 12. The computer device according to item 9 of the scope of patent application, further including a timing parameter generating unit for obtaining identification information of the LCD panel, and generating a second timing parameter within the range that the LCD panel designated by the identification Beixun can operate And register the second timing parameter in the timing table. 13. For the computer device according to item 12 of the scope of patent application, wherein the timing parameter generating unit obtains the EDID (Extended Display Identification Data) of the LCD panel as identification information. 14. A driving control method for an LCD (liquid crystal display) panel, comprising the following steps: detecting an event, that is, the LCD panel becomes an operating state that must reduce power consumption; and fixing the L c D when the event is detected The update rate of the panel to shorten the frame period of the image display. 15. The driving control method of the LCD panel according to item 14 of the scope of patent application, wherein the frame period is shortened by shortening the period of non-display when the image is redrawn in the LCD panel. 16. —A driving control method for an LCD panel, which includes the following steps: obtaining identification information of an LCD (liquid crystal display) panel; generating timing parameters, and using a fan garden specified by the obtained identification information to operate the LCD panel Shorten the frame period of the image display to reduce the operating frequency; and + drive the LCD panel according to the generated timing parameters. 17 · — A program that controls a computer to drive an LCD (LCD) panel, which includes the following steps: Detect events, that is, the LCD panel becomes an operation that must reduce power consumption. -26- A BCD 1 paper size suitable for wealth and family (CNS) A4 specification (21GX 297 public love) "-^ -—— C8 D8 / 、, declare the status of patent scope; and when this event is detected, Fixing the update rate of the LCD panel shortens the frame period during image display. 18. Type & type by controlling a computer to drive an LCD (liquid crystal display) panel, where the program will make the computer perform the following steps: Obtain the identification information of the LCD (liquid crystal display) panel; generate timing Parameters, shortening the frame period of the image display by using the LCD panel specified in the obtained identification information to reduce the operating cycle of the image display, and driving the LCD panel according to the generated timing parameters. -27- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)