CN110767182B - Screen display control system and screen display control method - Google Patents
Screen display control system and screen display control method Download PDFInfo
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- CN110767182B CN110767182B CN201911084023.4A CN201911084023A CN110767182B CN 110767182 B CN110767182 B CN 110767182B CN 201911084023 A CN201911084023 A CN 201911084023A CN 110767182 B CN110767182 B CN 110767182B
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- driving chip
- display control
- power saving
- circuit board
- screen display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a screen display control system and a screen display control method, wherein the system comprises a mainboard and an LCM (liquid crystal module), wherein the mainboard comprises a central processing unit; the LCM liquid crystal display module comprises an LCD panel and a backlight module; the backlight module comprises a flexible circuit board, a light source and a display driving chip; the light source is connected with the flexible circuit board; the flexible circuit board is connected with the central processing unit through a connector; one end of the display driving chip is connected with the flexible circuit board, and the other end of the display driving chip is connected with the LCD panel; two groups of charge pump circuits are arranged on the flexible circuit board and the display driving chip; the display driving chip is internally provided with a CABC functional module and a register which is connected with the CABC functional module and is stored with a plurality of power saving efficiencies corresponding to different power saving schemes. According to the invention, the display driving chip integrates the function of the backlight driving chip, so that devices on the mainboard are reduced, the manufacturing cost is saved, the pin number of the connector is reduced, and the overall assembly difficulty is reduced.
Description
Technical Field
The invention relates to the technical field of screen display control, in particular to a screen display control system and a screen display control method.
Background
At present, most of intelligent mobile terminals in the market basically support a cab (Content Adaptive Brightness Control, Content corresponds to backlight Control) function, that is, backlight Brightness is adjusted according to the Content of an image, so that power consumption of a backlight LED is reduced. As shown in fig. 1, in the conventional screen display control system, the CABC function is implemented by outputting a PWM duty ratio to a backlight driving chip in a main board through a display driving chip in an LCM liquid crystal display module to control a current output from the backlight driving chip to an LED lamp, thereby adjusting a backlight display brightness level of a screen and implementing power consumption control of a backlight source.
In the existing screen display control system, because more devices such as the backlight driving chip are arranged on the main board, the manufacturing cost of the whole screen display control system is higher, and moreover, the number of pins of the connector connected between the main board and the LCM is also more, so that the whole assembly difficulty is increased.
Disclosure of Invention
The invention provides a screen display control system and a screen display control method, which aim to overcome the defects of the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a screen display control system, including a main board and an LCM liquid crystal display module;
the mainboard comprises a central processing unit;
the LCM liquid crystal display module comprises an LCD panel and a backlight module arranged on the back of the LCD panel;
the backlight module comprises a flexible circuit board, a light source and a display driving chip;
the light source is connected with the flexible circuit board; the flexible circuit board is connected with the central processing unit through a connector; one end of the display driving chip is connected with the flexible circuit board, and the other end of the display driving chip is connected with the LCD panel;
two groups of charge pump circuits are arranged on the flexible circuit board and the display driving chip, one group of charge pump circuits in the two groups of charge pump circuits is used for generating VGH/VGL voltage, and the other group of charge pump circuits is used for providing positive and negative voltages for the light source;
the display driving chip is internally provided with a CABC functional module and a register which is connected with the CABC functional module and is stored with a plurality of power saving efficiencies corresponding to different power saving schemes.
Further, in the screen display control system, the main board further comprises a power supply unit;
the power supply unit is connected with the central processing unit and used for providing working voltage for the central processing unit.
Furthermore, in the screen display control system, the main board, the LCM and the connector are all provided with MIPI interfaces.
Further, in the screen display control system, the display driving chip and the light source are both located on the flexible circuit board at a side close to the LCD panel.
In a second aspect, an embodiment of the present invention provides a screen display control method, which is executed by using the screen display control system described in the first aspect, and the method includes:
the central processing unit transmits image display data to the display driving chip through the connector;
the display driving chip judges a required power saving scheme through the received image display data and calls power saving efficiency corresponding to the power saving scheme from the register through the CABC functional module;
the charge pump circuit adjusts the current output to the light source according to the power saving efficiency, so that the backlight display brightness of the screen is adjusted.
Further, in the screen display control method, before the step of the central processing unit transmitting the image display data to the display driving chip through the connector, the method further includes:
and burning a plurality of power saving efficiencies corresponding to different power saving schemes into the register inside the display driving chip.
According to the screen display control system and the screen display control method provided by the embodiment of the invention, the display driving chip integrates the function of the backlight driving chip, so that the number of devices on the mainboard is reduced, the manufacturing cost is saved, the pin number of the connector is reduced, and the overall assembly difficulty is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a prior art screen display control system;
FIG. 2 is a schematic structural diagram of a screen display control system according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a screen display control method according to a second embodiment of the present invention.
Reference numerals:
mainboard 1, LCM liquid crystal display module 2, connector 3, central processing unit 4, power supply unit 5, LCD panel 6, backlight unit 7, flexible line way board 8, light source 9, display driver chip 10, charge pump circuit 11, register 12, CABC functional module 13.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
Referring to fig. 2, an embodiment of the invention provides a screen display control system, which includes a main board 1 and an LCM liquid crystal display module 2;
the mainboard 1 comprises a central processing unit 4;
the LCM liquid crystal display module 2 comprises an LCD panel 6 and a backlight module 7 arranged on the back of the LCD panel 6;
the backlight module 7 comprises a flexible circuit board 8, a light source 9 and a display driving chip 10;
the light source 9 is connected with the flexible circuit board 8; the flexible circuit board 8 is connected with the central processing unit 4 through a connector 3; one end of the display driving chip 10 is connected with the flexible circuit board 8, and the other end is connected with the LCD panel 6;
two groups of charge pump circuits 11 are arranged on the flexible circuit board 8 and the display driving chip 10, one group of charge pump circuits 11 in the two groups of charge pump circuits 11 is used for generating VGH/VGL voltage, and the other group of charge pump circuits 11 is used for providing positive and negative voltage for the light source 9;
the display driving chip 10 has a CABC function module 13 and a register 12 connected to the CABC function module 13 and storing a plurality of power saving efficiencies corresponding to different power saving schemes.
Preferably, the main board 1 further includes a power supply unit 5;
the power supply unit 5 is connected with the central processing unit 4 and is used for providing working voltage for the central processing unit 4.
Preferably, the main board 1, the LCM liquid crystal display module 2, and the connector 3 all have MIPI (Mobile Industry Processor Interface) interfaces.
It should be noted that, in this embodiment, the display driver chip 10 is integrated with the function of the backlight driver chip, so that the connector 3 does not need pins for connecting the positive and negative electrodes of the light source 9 and the PWM pin.
In this embodiment, only one set of charge pump circuits 11 for generating VGH/VGL voltages is originally provided on the flexible circuit board 8 and the display driver chip 10, the VGH/VGL voltages are respectively the on/off voltages of the TFT screen, the VGH/VGL voltages are ± high voltages, and the LEDA/K (positive and negative electrodes of the light source 9) is also ± high voltages, but the VGH/VGL voltage current is small, and a set of charge pump circuits 11 capable of carrying high currents is provided on the flexible circuit board 8 and the display driver chip 10 to provide positive and negative voltages for the light source 9, which is a solution for the positive and negative voltages of the LEDA/K.
Preferably, the display driving chip 10 and the light source 9 are both located on one side of the flexible circuit board 8 close to the LCD panel 6.
According to the screen display control system and the screen display control method provided by the embodiment of the invention, the display driving chip integrates the function of the backlight driving chip, so that the number of devices on the mainboard is reduced, the manufacturing cost is saved, the pin number of the connector is reduced, and the overall assembly difficulty is reduced.
Example two
Referring to fig. 3, a second embodiment of the present invention provides a screen display control method implemented by the screen display control system according to the first embodiment, the method including:
s101, the central processing unit transmits image display data to the display driving chip through a connector;
s102, the display driving chip judges a required power saving scheme through the received image display data, and calls power saving efficiency corresponding to the power saving scheme from the register through the CABC functional module;
s103, the charge pump circuit adjusts the current output to the light source according to the power saving efficiency, and therefore the backlight display brightness of the screen is adjusted.
Specifically, one of the two sets of charge pump circuits for providing positive and negative voltages for the light source adjusts the current output to the light source according to the power saving efficiency, so as to adjust the backlight display brightness of the screen.
Preferably, before the step of the central processing unit transmitting the image display data to the display driving chip through the connector, the method further comprises:
and burning a plurality of power saving efficiencies corresponding to different power saving schemes into the register inside the display driving chip.
According to the screen display control method provided by the embodiment of the invention, the display driving chip integrates the function of the backlight driving chip, so that the number of devices on the mainboard is reduced, the manufacturing cost is saved, the pin number of the connector is reduced, and the overall assembly difficulty is reduced.
The above embodiments are merely to illustrate the technical solutions of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a screen display control system, includes mainboard and LCM liquid crystal display module assembly, its characterized in that:
the mainboard comprises a central processing unit;
the LCM liquid crystal display module comprises an LCD panel and a backlight module arranged on the back of the LCD panel;
the backlight module comprises a flexible circuit board, a light source and a display driving chip;
the light source is connected with the flexible circuit board; the flexible circuit board is connected with the central processing unit through a connector; one end of the display driving chip is connected with the flexible circuit board, and the other end of the display driving chip is connected with the LCD panel;
two groups of charge pump circuits are arranged on the flexible circuit board and the display driving chip, one group of charge pump circuits in the two groups of charge pump circuits is used for generating VGH/VGL voltage, and the other group of charge pump circuits is used for providing positive and negative voltages for the light source;
the display driving chip is internally provided with a CABC functional module and a register which is connected with the CABC functional module and is stored with a plurality of power saving efficiencies corresponding to different power saving schemes.
2. The screen display control system of claim 1, wherein the main board further comprises a power supply unit;
the power supply unit is connected with the central processing unit and used for providing working voltage for the central processing unit.
3. The screen display control system of claim 1, wherein the main board, the LCM and the connector all have MIPI interfaces.
4. The screen display control system of claim 1, wherein the display driver chip and the light source are both located on a side of the flexible wiring board proximate to the LCD panel.
5. A screen display control method executed by the screen display control system according to any one of claims 1 to 4, the method comprising:
the central processing unit transmits image display data to the display driving chip through the connector;
the display driving chip judges a required power saving scheme through the received image display data and calls power saving efficiency corresponding to the power saving scheme from the register through the CABC functional module;
the charge pump circuit adjusts the current output to the light source according to the power saving efficiency, so that the backlight display brightness of the screen is adjusted.
6. The screen display control method of claim 5, further comprising, prior to the step of the central processor transmitting image display data to the display driver chip via a connector:
and burning a plurality of power saving efficiencies corresponding to different power saving schemes into the register inside the display driving chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084023.4A CN110767182B (en) | 2019-11-07 | 2019-11-07 | Screen display control system and screen display control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084023.4A CN110767182B (en) | 2019-11-07 | 2019-11-07 | Screen display control system and screen display control method |
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| CN110767182A CN110767182A (en) | 2020-02-07 |
| CN110767182B true CN110767182B (en) | 2021-06-29 |
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| CN114639359B (en) * | 2022-03-31 | 2024-07-26 | 上海创功通讯技术有限公司 | Method and device for adjusting backlight brightness |
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| CN110767182A (en) | 2020-02-07 |
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