WO2016095246A1

WO2016095246A1 - Method and device for displaying window of screen

Info

Publication number: WO2016095246A1
Application number: PCT/CN2014/094635
Authority: WO
Inventors: 任兴业
Original assignee: 深圳Tcl数字技术有限公司
Priority date: 2014-12-18
Filing date: 2014-12-23
Publication date: 2016-06-23
Also published as: CN105761681A; CN105761681B

Abstract

A device for displaying a window of a screen comprises a movement circuit module (110), an information processing module (120) and a backlight dot matrix module (130), wherein the movement circuit module (110) is provided with an image storage space in advance; the image storage space in the movement circuit module (110) is used for storing received information to be displayed, and the movement circuit module (110) is used for calculating, according to the current information storage situation of the image storage space, display parameters corresponding to each effective window; the information processing module (120) calculates a state value of each LED in the backlight dot matrix module (130) according to the display parameters corresponding to the effective window; and the backlight dot matrix module (130) controls the switching on or off of each LED on the backlight dot matrix module (130) according to the state value of each LED in the information processing module (120). Further disclosed is a method for displaying a window of a screen for adjusting an output display window according to different inputs so as to meet the optimum display demand of a client.

Description

Window display method and device

Technical field

The present invention relates to the field of screen display, and in particular, to a window display method and apparatus for a screen.

Summary of the invention

The main object of the present invention is to solve the technical problem that the output display window cannot be adjusted according to signal input of different resolutions when the screen display in the prior art is implemented.

In order to achieve the above object, the present invention provides a screen display device for a screen, including a movement circuit module, an information processing module, and a backlight dot matrix module, wherein the movement circuit module presets an image storage space in which the image storage space is The address of the storage unit corresponds to the position of the effective display pixel of the screen;

The movement circuit module receives the information to be displayed and stores it in the image storage space, and the movement circuit module calculates display parameters corresponding to each valid window according to the current information storage situation of the image storage space and feeds back An information processing module, each displayed information corresponding to a valid window;

The information processing module calculates a state value of each LED in the backlight dot matrix module according to the display parameter corresponding to the effective window, and sends the calculated state value of each LED to the backlight dot matrix module;

The backlight dot matrix module controls lighting or turning off of each of the LEDs according to a state value of each of the LEDs.

Preferably, when the movement circuit module receives the information to be displayed from the plurality of channels, the movement circuit module acquires a starting address of the information storage corresponding to the information to be displayed according to the identifier of the information to be displayed, and The information to be displayed is sequentially stored in the storage unit of the image storage space according to the start address until the received information is all stored in the image storage space.

Preferably, the information storage situation includes a starting address of each information to be displayed and a corresponding resolution, and the movement circuit module is specifically configured to: based on a starting address and corresponding resolution of each displayed information The rate calculates a display parameter of a valid window corresponding to each displayed information, the display parameter including a valid window position and size.

Preferably, the information processing module is configured to reserve an N*M bit storage space, where N is the number of backlight dot matrix horizontal LEDs, and M is a number of backlight dot matrix vertical LEDs, and the bit address of the storage space corresponds to the backlight The physical coordinate position of the LED in the dot matrix module; according to the obtained display parameter of the effective display window of the liquid crystal panel, the LED state in the effective display window is set to "lighting", and the LED state outside the effective display window is set to " "OFF"; the state of the set LED is correspondingly written to the storage space set by the signal processing module according to the physical coordinate position of the LED in the backlight dot matrix module.

Preferably, the backlight dot matrix module comprises a plurality of LED matrices and a plurality of constant current driving chips, and the plurality of constant current driving chips are connected in a cascade manner.

Preferably, the constant current driving chip and the LED matrix are connected by a trace on the PCB.

Preferably, the driving of the LED matrix adopts a single LED low voltage power supply driving mode.

Preferably, the constant current driving chip is configured to receive a control signal output by the signal processing module, and includes an SI interface, a CLK interface, a LATCH interface, and an OE interface, where the constant current driving chip is under the control signal of the CLK interface, and is controlled by the SI. The interface receives the state value of the LED output by the signal processing module, and transmits the state value to the constant current driving channel temporary storage register of each LED of the backlight dot matrix module; the constant current driving chip controls according to the LATCH interface The signal inputs the state value of the LED into the driving register of the constant current driving chip; the constant current driving chip turns on the constant current driving channel according to the control signal of the OE interface, so that the state value of the LED is output to the corresponding constant current driving channel to Corresponding LED.

Preferably, the constant current driving channel of the constant current driving chip adopts mutual delay on and off.

Preferably, the constant current driving chip has a minimum output current width of 20 ns.

Preferably, the movement circuit module is further configured to: when calculating a display parameter corresponding to each valid window according to a current information storage situation in the image storage space, or send the display parameter corresponding to the calculated valid window to Before the information processing module receives the user's setting requirement for the resolution of the displayed information, the calculated effective window is adjusted according to the user's needs.

In addition, in order to achieve the above object, the present invention also provides a window display method for a screen, comprising the following steps:

When receiving the information to be displayed, the movement circuit module stores the corresponding information in the image storage space of the movement circuit module, wherein the storage address in the image storage space corresponds to the effective display pixel position of the liquid crystal panel;

The movement circuit module calculates display parameters corresponding to each effective display window of the liquid crystal panel according to the current information storage condition of the image storage space;

The movement circuit module outputs display parameters of the calculated effective display window of the liquid crystal panel to the signal processing module;

The signal processing module calculates, according to the display parameters of each valid display window of the obtained liquid crystal panel, a state value of each LED in the backlight dot matrix module;

The signal processing module controls lighting or turning off of each LED in the backlight dot matrix module according to a state value of each LED in the backlight dot matrix module.

Preferably, the information storage situation includes a starting address of each information to be displayed and a corresponding resolution, and the movement circuit module calculates each effective display window of the liquid crystal panel according to the current information storage condition of the image storage space. The corresponding display parameters include:

The movement circuit module calculates display parameters of the valid window corresponding to each displayed information based on the starting address and the corresponding resolution of each displayed information, the display parameters including the effective window position and size.

Preferably, the signal processing module calculates, according to the obtained display parameter of the effective display window of the liquid crystal panel, the state value of the LED for obtaining the screen includes:

The signal processing module sets an N*M bit storage space, where N is the number of horizontal LEDs in the backlight dot matrix module, and M is the number of vertical LEDs in the backlight dot matrix module;

The signal processing module sets the LED state in the effective display window to “lighting” according to the obtained display parameter of the effective display window of the liquid crystal panel, and sets the LED state outside the effective display window to “off”;

The signal processing module writes the state of each LED in the backlight dot matrix module to the storage space set by the signal processing module according to the physical coordinate position of the LED in the backlight dot matrix module, and the bit address of the storage space corresponds to the backlight. The physical coordinate position of the LED in the dot matrix module.

Preferably, the signal processing module controls, according to the state value of each LED in the backlight matrix module, the lighting or turning off of each LED in the backlight dot matrix module, including:

The signal processing module serially inputs the state value of each LED in the backlight dot matrix module stored in the storage space into the driving chipset in the backlight dot matrix module, and the driving chipset in the backlight dot matrix module includes a cascade manner Connected at least one constant current driving chip;

The constant current driving chip drives the corresponding LED to light or turn off according to the state value of the LED.

Preferably, the backlight dot matrix module further comprises an LED matrix, and the LED matrix and the constant current driving chip are connected by a trace on the PCB.

Preferably, the LED matrix is driven by a single LED low voltage power supply.

Preferably, the constant current driving chip is configured to receive a control signal output by the signal processing module, and includes an SI interface, a CLK interface, a LATCH interface, and an OE interface; and the constant current driving chip drives the corresponding value according to the state value of the LED. The LED is lit or turned off to include:

The constant current driving chip receives the state value of the LED output by the signal processing module by the SI interface under the control signal of the CLK interface, and transmits the state value of the LED to each LED of the backlight dot matrix module. In the scratchpad register;

The constant current driving chip inputs a state value of the LED into a driving register of the constant current driving chip according to a control signal of the LATCH interface;

The constant current driving chip turns on the constant current driving channel according to the control signal of the OE interface, so that the state value of the LED is output from the corresponding constant current driving channel to the corresponding LED to drive the corresponding LED to be turned on or off.

Preferably, the constant current driving chip delays opening the constant current driving channel according to the control signal of the OE interface to prevent the LEDs from being turned on and off at the same time.

Preferably, the movement circuit module further includes: according to the current information storage situation of the image storage space, when calculating display parameters corresponding to each valid display window of the liquid crystal panel:

If the user needs to set the resolution of the displayed information, the calculated valid window is adjusted according to the user's requirement to send the adjusted display parameter to the information processing module.

In summary, the window display device of the screen of the present invention has the following beneficial effects on the prior art:

(1) The movement circuit module of the present invention has a linear adjustment function for the output display window position and size of an arbitrary input signal source; in addition, the present invention supports multi-source multi-window display, and each display window can be superimposed on each other, Can be independent of the different physical effective pixel areas of the display screen.

(2) In the invention, the information processing module drives the LED on the backlight dot matrix module according to the effective display window calculated by the movement circuit module, and turns off the LED outside the effective display pixel boundary of the television to achieve the purpose of efficiently utilizing the LED on the backlight dot matrix module. The invention is also compatible with the traditional movement PWM dimming mode and the LOCAL-DIMMING dimming mode, and the dimming function can work in BY In the PASS state.

(3) The LED on the backlight dot matrix module of the invention adopts a single low voltage power supply driving mode, and the power supply voltage of the LED on the backlight dot matrix module adopts a precise design (VF+VD), and the VF is the positive effective turn-on voltage of the LED. VD is the effective port voltage of the constant current driver chip on the backlight dot matrix module, which helps to reduce the excess energy consumption.

(4) In the present invention, the constant current driving chip on the backlight dot matrix module adopts a bit weight coding pulse width modulation mode when the LED is driven, and the LED brightness gray level can be adjusted between 0 and 65536 to satisfy a large area of the image. The algorithm drives the needs of the backlight LED; the hardware architecture of the information processing module in the present invention also supports LOCAL The DIMMING algorithm data drives the LEDs on the backlight dot matrix module; the invention improves the leakage phenomenon of the LCD caused by the discontinuity of the LED brightness adjustment of the original LOCAL-DIMING.

(5) The current output channel delay on and off function of the LED constant current driving device used in the invention can effectively reduce the overshoot range caused by the simultaneous opening and closing of a large number of LEDs, and improve the system EMI problem.

(6) The constant current chip and the LED matrix of the present invention are connected by a PCB trace, and the design of the light-driven combination is more advantageous for system stability.

DRAWINGS

1 is a schematic structural view of a window display device of a screen of the present invention;

2 is a map showing a mapping relationship between an image storage space of a movement circuit module and an effective display pixel position of the liquid crystal panel in the window display device of the screen of the present invention;

3 is a diagram showing an example of a plurality of effective display windows displayed on a screen in a window display device of a screen of the present invention;

4 is a diagram showing an example of displaying an effective display window on a screen according to window information stored in an image storage space in a movement circuit module in the window display device of the screen of the present invention;

5 is a mapping diagram of physical coordinates of LEDs on a backlight dot matrix module and positions of effective display pixel points of a liquid crystal panel in a window display device of the screen of the present invention;

6 is a view showing an example of an effective display window displayed on the screen in the window display device of the screen of the present invention;

7 is a schematic view showing a state of an LED on a backlight dot matrix module when the effective display window is displayed in FIG. 6;

8 is a schematic structural diagram of an information processing module in a window display device of a screen of the present invention;

9 is a schematic diagram showing a connection structure between a signal processing module and a constant current driving chip in a backlight dot matrix module in a window display device of the screen of the present invention;

10 is a driving logic block diagram of a constant current driving chip of a backlight dot matrix module in a window display device of the screen of the present invention;

11 is a timing diagram of setting LED states on a display window and a backlight dot matrix module in a window display device of a screen of the present invention;

12 is a schematic flow chart of a first embodiment of a window display method of a screen according to the present invention;

13 is a schematic flow chart of a second embodiment of a window display method of a screen according to the present invention;

14 is a schematic diagram showing a refinement process of obtaining a state value of each LED in a backlight dot matrix module according to a display parameter of an effective display window in a window display method of the screen of the present invention;

15 is a schematic diagram of a refinement process of controlling a display state of each LED in a backlight dot matrix module according to a state value of each LED in the backlight dot matrix module in the window display method of the screen of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the present invention, an image storage space is provided in the movement circuit module, and the storage unit address of the image storage space corresponds to the effective display pixel position of the liquid crystal panel. The image storage space is used to store input information to be displayed. After receiving the information to be displayed, the movement circuit module can calculate the display parameter of the effective window of the liquid crystal panel according to the current information storage condition in the image storage space, and transmit the display parameter to the signal processing module to control the display of the backlight dot matrix LED. .

As shown in Fig. 1, the structure of a window display device of the screen of the present invention is shown. The window display device of the screen may include a movement circuit module 110, a signal processing module 120, and a backlight dot matrix module 130. The movement circuit module 110 is configured to receive information to be displayed, that is, information sent by the signal source sending end that needs to be displayed on the screen. Moreover, the movement circuit module 110 can communicate with the signal processing module 120 via a USB 2.0 interface or other communication interface. After the movement circuit module 110 receives the information to be displayed, the information is processed, for example, the display parameter of the valid window to be displayed by the information to be displayed is calculated. The movement circuit module 110 then sends the processed information to the signal processing module 120, while the movement circuit module 110 will also generate control signals to control the operational mode of the signal processing module 120, such as conventional dimming mode or LOCAL- DIMMING mode and more. The signal processing module 120 calculates the state values of the LEDs in the backlight dot matrix module 130 according to the control of the movement circuit module 110, and outputs the values to the backlight dot matrix module 130 for the backlight dot matrix module 130 to drive the LEDs for display.

As shown in FIG. 2, the mapping relationship between the image storage space of the movement circuit module and the effective display pixels of the liquid crystal panel in the window display device of the screen of the present invention is shown. The position of the effective display pixel of the liquid crystal panel is represented by the physical coordinate (X, Y) of the first pixel in the upper left corner of the effective display area as the origin (0, 0) and the pixel pitch is the step size. In this embodiment, the step size of the pixel pitch is 1, but it is not limited to 1, and may be other values. An image storage space is disposed in the movement circuit module 110, and an address of the storage unit in the image storage space corresponds to a position at which the liquid crystal panel effectively displays the pixel point. Specifically, the origin corresponds to the first storage unit in the image storage space, and then the second pixel of the first row corresponds to the second storage unit of the image storage space, and the third pixel of the first row corresponds to the image storage. The third storage unit of space, and so on, until the position of all valid display pixels of the liquid crystal panel corresponds to the address of the storage unit of the image storage space.

After receiving the information to be displayed, the movement circuit module 110 stores the information to be displayed one by one into the storage unit of the image storage space. In this embodiment, the movement circuit module 110 will set a starting address of information storage, and the starting address may be set by default by the movement circuit module 110, or may be flexibly set by the user according to specific conditions. Therefore, the start position of the window displaying the information can be flexibly adjusted by the setting of the start address. For example, in order to avoid display conflict, after the movement circuit module 110 receives the information to be displayed, the storage unit that does not store data in the image storage space may be acquired first, and then a start is set according to the storage unit condition of the acquired unstored data. The address is stored in the image storage space in order according to the start address.

The screen can support multiple windows to display simultaneously. The movement circuit module 110 can receive information of multiple channels, and each channel is correspondingly provided with a starting address for information storage, and the information sent from the corresponding channel will carry a corresponding identifier. The movement circuit module 110 first acquires the start address of the information storage corresponding to the identifier of the information according to the identifier of the received information, and then sequentially stores the received information into the storage unit of the image storage space according to the start address. Until the received information is all stored in the image storage space. As shown in FIG. 3, the resolution of the screen is 3840*2160, and the screen supports information display of four effective display windows, that is, the effective display window a, the effective display window b, the effective display window c, and the effective display window d. After all the information to be displayed is stored in the image storage space, the movement circuit module 110 calculates the display parameters corresponding to each valid window according to the current information storage situation in the image storage space. The information storage situation may include a starting address of each information to be displayed and a corresponding resolution. The movement circuit module 120 is specifically configured to: calculate a display parameter of a valid window corresponding to each displayed information based on a starting address and a corresponding resolution of each displayed information, where the display parameter includes a valid window position And size. For example, if the resolution of the information to be displayed is 640*480 and the starting address is A, the movement circuit module 110 effectively displays the pixel point corresponding to the liquid crystal panel corresponding to the starting address as a vertex coordinate of the effective window. Then, according to the resolution 640*480, the coordinates of the boundary point forming the effective window are calculated. In this embodiment, the effective window will be represented by diagonal coordinates. For example, the effective window a is represented by diagonal coordinates (x1a, y1a) and (x2a, y2a). The movement circuit module 110 then sends the display parameters of the active window (eg, the diagonal coordinates of the active window) to the information processing module 120.

It can be understood that if the effective display window information stored in the image storage space of the movement circuit module 110 overlaps, the displayed effective display windows will also overlap. As shown in FIG. 4, the image storage space includes 8,294,400 storage units corresponding to effective display pixels of the liquid crystal panel (3840*2160=8294400). Moreover, the image storage space stores two effective display windows, that is, an effective display window a and an effective display window b, wherein the effective display window a and the effective display window b respectively overlap in the storage units in the image storage space. Therefore, the movement circuit module 110 calculates the display parameters for obtaining the effective display window based on the information storage situation in the image storage space. After the movement circuit module 110 sends the display parameter to the information processing module 120, the information processing module 120 controls the screen to simultaneously display the effective window a and the effective window b according to the display parameter, and the effective window a and the effective window b overlap. part.

After receiving the display parameters of the valid window sent by the movement circuit module 110, the information processing module 120 calculates the state value of the LED in the backlight dot matrix module 130. Specifically, the information processing module 120 reserves an N*M bit storage space in its memory to store the LED state, where N is the number of backlight dot matrix horizontal LEDs, and M is the number of backlight dot matrix vertical LEDs. The storage space is bit-addressed, and the bit address corresponds to a physical position (x, y) of the backlight dot matrix LED. The physical coordinates of the LED and the effective display pixel coordinates of the liquid crystal panel are represented by the same reference origin and pixel pitch step; And the structural design determines that each LED corresponds to the effective pixel area of the liquid crystal panel. As shown in FIG. 5, the effective display pixels on the liquid crystal panel are matrix pixel regions formed by 3840 rows and 2160 columns, and the number of horizontal LEDs in the backlight dot matrix module 130 is N, and the number of vertical LEDs is M, therefore, each The effective display pixel area corresponding to the LED has a length of 3840/N and a width of 2160/M. The information processing module 120 sets the state of the LED in the corresponding range of the pixel of the effective display window to “lighting” according to the display parameter of the effective window sent by the movement circuit module 110. In this embodiment, the status value is 1 The state of the LED outside the pixel corresponding to the pixel of the effective display window is set to "OFF". In this embodiment, the state value is "0".

As shown in FIG. 6, the effective display window in the screen is one, and the diagonal coordinates of the effective display window are: (x1, y1) and (x2, y2). And the pixel area corresponding to each LED is X∈[(x-1920/N), (x+1920/N)], Y∈[(y-1080/M), (y+1080/M)]. Therefore, the information processing module 120 calculates the state value of the backlight dot matrix LED according to the display parameter of the effective display window sent by the movement circuit module 110, as shown in Table 1 below:

Table 1. Status values of the backlight dot matrix LEDs corresponding to the effective display window

Serial number	Comparison of LED coordinate area and display window coordinates	Setting status	LED status
1	X1≤x≤x2 and y1≤y≤y2	1	ON
2	(x+1920/N)≤x1	0	OFF
3	X2≤(x-1920/N)	0	OFF
4	(y+1080/M)≤y1	0	OFF
5	Y2≤(y-1080/M)	0	OFF
6	X≤x1≤(x+1920/N)≤x2 and y1≤y≤y2	1	ON
7	X1≤(x-1920/N)≤x2≤x and y1≤y≤y2	1	ON
8	X1≤x≤x2 and y≤y1≤(y+1080/M)≤y2	1	ON
9	X1≤x≤x2 and y1≤(y-1080/M)≤y2≤y	1	ON
10	X≤x1≤(x+1920/N)≤x2 and y1≤(y-1080/M)≤y2≤y	1	ON
11	X≤x1≤(x+1920/N)≤x2 and y1≤(y+1080/M)≤y2≤y	1	ON
12	X1≤(x-1920/N)≤x2≤x and y1≤(y-1080/M)≤-y2≤y	1	ON
13	X1≤(x-1920/N)≤x2≤x and y≤y1≤(y+1080/M)≤y2	1	ON

Then, the information processing module 120 implements state control of each LED through the constant current driving chip of the backlight dot matrix module 130. As shown in FIG. 7, the backlight dot matrix module 130 controls each LED on the backlight dot matrix module 130 to be turned on or off according to the state data of each LED in the information processing module 120, that is, the LEDs covered by the effective display window are all lit. The LEDs outside the effective display window are all off.

Further, since the user can set the display parameters of the current display information of the liquid crystal panel, such as the resolution, and the information to be displayed has the resolution itself, the movement circuit module 110 calculates according to the current information storage situation in the image storage space. When the display parameter corresponding to each valid window, or before the display parameter corresponding to the calculated valid window is sent to the information processing module, if the user's setting requirement for the resolution of the display information is received, the calculated calculation is valid. The window is adjusted according to user needs. Specifically, the zoom ratio of the effective display window and the storage length of the image storage space are adjusted to achieve the size adjustment of the display window, so that the effective display window satisfies the actual user needs, and the corresponding LED backlight area also changes. For example, the user requests that the window information currently displayed by the liquid crystal panel is in the ultra high definition format, and the resolution is 3840*2160, and the resolution of the window information to be displayed itself is 640*480, then the movement circuit module 110 will be based on The user needs to adjust the size of the effective display window, for example, inserting a pixel between the pixels of the window information to be displayed, or inserting a corresponding storage unit in the storage address of each pixel in the image storage space to be displayed, that is, Increase the storage length of the image storage space to be displayed. The user requires that the resolution of the window information currently displayed by the liquid crystal panel is 640*480, and the resolution of the window information to be displayed itself is 3840*2160, and the movement circuit module 110 adjusts the effective display window according to the user's needs. The size, for example, extracts the pixel point interval of the window information to be displayed, or extracts the storage unit corresponding to the pixel point in the image storage space to be displayed, that is, reduces the storage length of the image storage space to be displayed.

Further, as shown in FIG. 8, the specific structure of the signal processing module of the present invention is shown. The signal processing module 120 can include: a clock PLL, a frequency multiplier, a counter, a USB 2.0 interface, an MCU, a logic algorithm module, and a number of GPIO ports, and the like. The signal processing module 120 can support 8 sets of bus outputs, and each group of buses supports up to 256 points of LED control. Of course, depending on the actual needs, you can use a more resource-rich chip to expand the output bus. The USB2.0 is a communication control interface of the movement circuit module 110 and the signal processing module 120, and the movement circuit module 110 can freely switch the operation mode of the signal processing module 120.

Further, as shown in FIG. 9, the backlight dot matrix module 130 of the present invention includes a plurality of LED matrices and a plurality of constant current driving chips. The LED matrix is formed by a plurality of LEDs disposed on the PCB, and the plurality of constant current driving chips are connected by a cascade connection, and the constant current driving chip and the LED matrix are connected by the traces on the PCB. Since the backlight dot matrix module 130 adopts a lamp matrix design of an LED matrix and a constant current driving chip, the system stability is more favorable. In this embodiment, the constant current driving chip is a 16-channel serial constant current driving chip, and may include an SI interface, a CLK interface, a LATCH interface, an OE interface, and may further include a constant current module. The constant current driving chip receives the LED state value output by the signal processing module 130 by the SI interface under the control signal of the CLK interface, and serially transmits the LED state value to the constant current driving channel of each LED of the backlight dot matrix module 130. Stored in the register. The constant current driving chip inputs the state value of the LED into the driving register of the constant current driving chip according to the control signal of the LATCH interface; the constant current driving chip turns on the constant current driving channel according to the control signal of the OE interface, so that the LED is The status value is output to the corresponding LED by the corresponding constant current drive channel. The LED matrix is driven by a single LED low-voltage power supply. The power supply voltage is selected by precise design (VF+VD), where VF is the LED's positive effective turn-on voltage, and VD is the effective terminal voltage drop of the constant current drive chip, achieving efficient power supply drive. . At the same time, the single low-voltage power supply driving mode is also beneficial to the combination of the LED matrix and the constant current driving chip.

As shown in FIG. 10 and FIG. 11 , first, the signal processing module 130 is input to the first flip-flop of the constant current driving chip through the SI port of the constant current driving chip, and the flip-flop will output a signal under the control of the CLK interface. The next flip-flop, and so on, through serial transmission, under the control of the CLK interface, the status value of the LED will be sent to the constant-current drive channel temporary register of each LED of the backlight matrix module 130 through the DATA data line. Then, the state value of the LED is input into the drive register of the constant current driving chip by the control of the LATCH signal. Finally, through the control of the OE (DIM) signal, the constant current driving channel is turned on, so that the state value of the LED is output to the corresponding LED from the corresponding constant current driving channel, thereby controlling the LED to be turned on or off. In order to control the constant current of the output signal in the constant current driving chip, the constant current output is also controlled by a constant current module in a constant current driving chip. The constant current value output by the constant current module may be provided by an external constant current source or may be preset by a register.

Since the minimum output current width of the constant current driving chip is 20 ns, the constant current driving chip is driven to realize 65536 gray scale driving, and the LED brightness can be continuously adjusted gradually to meet the needs of the image large area algorithm driving the backlight LED, and the improvement is improved. The LCD leakage phenomenon caused by the discontinuity of LED brightness adjustment under the original LOCAL-DIMING control.

Further, the constant current driving channel of the constant current driving chip will also be mutually delayed on and off, that is, the constant current driving channel of the constant current driving chip will be delayed for a period of time to be turned on again under the control of the OE signal, or constant current. The constant current drive channel of the driver chip will be turned off for a period of time when it is turned off under the control of the OE signal. This can effectively reduce the overshoot caused by the simultaneous opening and closing of a large number of LEDs, and improve system EMI problems. It should be noted that the delay on and off of the constant current driving channel of the constant current driving chip can be realized by the chip characteristics of the constant current driving chip.

(2) In the invention, the information processing module drives the LED on the backlight dot matrix module according to the effective display window calculated by the movement circuit module, and turns off the LED outside the effective display pixel boundary of the television to achieve efficient use of the LED on the backlight dot matrix module. The invention is also compatible with the traditional movement PWM dimming mode and the LOCAL-DIMMING dimming mode, and the dimming function can work in BY In the PASS state.

Based on the window display device of the above screen, the present invention also proposes a window display method for a screen. As shown in FIG. 12, the screen window display method of this embodiment may include the following steps:

Step S110: When the movement circuit module receives the information to be displayed, it stores the corresponding information in the image storage space of the movement circuit module, wherein the storage address in the image storage space corresponds to the effective display pixel position of the liquid crystal panel. ;

Step S120: The movement circuit module calculates and obtains display parameters corresponding to each valid display window of the liquid crystal panel according to the current information storage situation of the image storage space;

Step S130, the movement circuit module outputs the calculated display parameter of the effective display window of the liquid crystal panel to the signal processing module;

Step S140: The signal processing module calculates, according to display parameters of each valid display window of the liquid crystal panel, a state value of each LED in the backlight dot matrix module.

Step S150: The signal processing module controls each LED in the backlight dot matrix module to be turned on or off according to a state value of each LED in the backlight dot matrix module.

An image storage space is disposed in the movement circuit module 110, and an address of the storage unit in the image storage space corresponds to a position at which the liquid crystal panel effectively displays the pixel point. The image storage space is configured to receive information sent by the signal source sending end that needs to be displayed on the screen, so as to store the information to be displayed one by one into the storage unit of the image storage space. In this embodiment, the movement circuit module 110 will set a starting address of information storage, and the starting address may be set by default by the movement circuit module 110, or may be flexibly set by the user according to specific conditions. Therefore, the start position of the window displaying the information can be flexibly adjusted by the setting of the start address.

When the received information is stored in the image storage space, the movement circuit module 110 calculates the display parameters corresponding to each valid window according to the information storage situation in the image storage space. The information storage situation may include a starting address of each information to be displayed and a corresponding resolution. The step S120 specifically includes: calculating display parameters of the valid window corresponding to each displayed information based on the starting address of the displayed information and the corresponding resolution, where the display parameters include the effective window position and size. For example, if the resolution of the information to be displayed is 640*480 and the starting address is A, the movement circuit module 110 effectively displays the pixel point corresponding to the liquid crystal panel corresponding to the starting address as a vertex coordinate of the effective window. Then, according to the resolution 640*480, the coordinates of the boundary point forming the effective window are calculated. In this embodiment, the effective window will be represented by diagonal coordinates. The movement circuit module 110 then sends the display parameters of the active window (eg, the diagonal coordinates of the active window) to the information processing module 120.

After receiving the display parameters of the valid window sent by the movement circuit module 110, the information processing module 120 calculates the state value of the LEDs in the backlight dot matrix module 130. The information processing module 120 then implements state control of each LED through the constant current driving chip of the backlight dot matrix module 130.

Further, as shown in FIG. 13, before step S130, the method further includes:

Step S160: The movement circuit module 110 adjusts the size of the effective display window according to user requirements.

Since the user can set the display parameters of the current display information of the liquid crystal panel, such as the resolution, and the information to be displayed has the resolution itself, the movement circuit module 110 calculates each valid according to the current information storage situation in the image storage space. When the parameter corresponding to the window is displayed, or before the display parameter corresponding to the calculated valid window is sent to the information processing module 120, if the user needs to set the resolution of the display information, the calculated valid window is based on User requirements are adjusted accordingly. Specifically, the zoom ratio of the effective display window and the storage length of the image storage space are adjusted to achieve the size adjustment of the display window, so that the effective display window satisfies the actual user needs, and the corresponding LED backlight area also changes. For example, the user requests that the window information currently displayed by the liquid crystal panel is in a high-definition format with a resolution of 3840*2160. The resolution of the window information to be displayed is 640*480, and the movement circuit module 110 adjusts the size of the effective display window according to the user's needs, for example, inserting pixels between pixel points of the window information to be displayed. Or inserting a corresponding storage unit in the storage address of each pixel in the image storage space to be displayed, that is, increasing the storage length of the image storage space to be displayed. The user requires that the resolution of the window information currently displayed by the liquid crystal panel is 640*480, and the resolution of the window information to be displayed itself is 3840*2160, and the movement circuit module 110 adjusts the effective display window according to the user's needs. The size, for example, extracts the pixel point interval of the window information to be displayed, or extracts the storage unit corresponding to the pixel point in the image storage space to be displayed, that is, reduces the storage length of the image storage space to be displayed.

Further, as shown in FIG. 14, the foregoing step S140 may include:

Step S141, the signal processing module 120 sets an N*M bit storage space, where N is the number of horizontal LEDs in the backlight dot matrix module 130, and M is the number of vertical LEDs in the backlight dot matrix module 130;

Step S142, the signal processing module 120 sets the LED state in the effective display window to “lighting” according to the obtained display parameter of the effective display window of the liquid crystal panel, and sets the LED state outside the effective display window to “close”. ";

Step S143, the signal processing module 120 writes the state of each LED in the backlight dot matrix module 130 to the storage space set by the signal processing module 120 according to the physical coordinate position of the LED in the backlight dot matrix module 130. The bit address of the storage space corresponds to the physical coordinate position of the LED in the backlight dot matrix module 130.

The information processing module 120 will reserve a section of N*M bit storage space in its memory to store the LED state, where N is the number of backlight dot matrix horizontal LEDs and M is the number of backlight dot matrix vertical LEDs. The storage space is bit-addressed, and the bit address corresponds to a physical position (x, y) of the backlight dot matrix LED. The physical coordinates of the LED and the effective display pixel coordinates of the liquid crystal panel are represented by the same reference origin and pixel pitch step; And the structural design determines that each LED corresponds to the effective pixel area of the liquid crystal panel. As shown in FIG. 5, the effective display pixels on the liquid crystal panel are matrix pixel regions formed by 3840 rows and 2160 columns, and the number of horizontal LEDs in the backlight dot matrix module 130 is N, and the number of vertical LEDs is M, therefore, each The effective display pixel area corresponding to the LED has a length of 3840/N and a width of 2160/M. The information processing module 120 sets the state of the LED in the corresponding range of the pixel of the effective display window to “lighting” according to the display parameter of the effective window sent by the movement circuit module 110. In this embodiment, the status value is 1 The state of the LED outside the pixel corresponding to the pixel of the effective display window is set to "OFF". In this embodiment, the state value is "0".

Further, as shown in FIG. 15, the foregoing step S150 may include:

Step S151, the signal processing module 120 serially inputs the state value of each LED in the backlight dot matrix module 130 stored in the storage space into the driving chipset in the backlight dot matrix module 130, in the backlight dot matrix module 130. The driving chipset includes at least one constant current driving chip connected in a cascade manner;

Step S152: The constant current driving chip drives the corresponding LED to be turned on or off according to the state value of the LED.

First, the signal processing module 130 inputs to the first flip-flop of the constant current driving chip through the SI port of the constant current driving chip, and the trigger will output a signal to the next trigger under the control of the CLK interface, and so on. Serial transmission, under the control of the CLK interface, the status value of the LED will be sent to the constant current drive channel temporary register of each LED of the backlight matrix module 130 through the DATA data line. Then, the state value of the LED is input into the drive register of the constant current driving chip by the control of the LATCH signal. Finally, through the control of the OE (DIM) signal, the constant current driving channel is turned on, so that the state value of the LED is output to the corresponding LED from the corresponding constant current driving channel, thereby controlling the conduction or closing of the LED. In order to control the constant current of the output signal in the constant current driving chip, the constant current output is also controlled by a constant current module in a constant current driving chip. The constant current value output by the constant current module may be provided by an external constant current source or may be preset by a register.

Since the minimum current width of the constant current driving chip is 20 ns, the constant current driving chip is driven to realize 65536 gray scale driving, and the LED brightness can be continuously adjusted gradually to meet the needs of the image large area algorithm driving the backlight LED, and the improvement is improved. Under the original LOCAL-DIMING control, the LCD light leakage phenomenon caused by the discontinuity of LED brightness adjustment.

In summary, the window display mode of the screen of the present invention has the following beneficial effects on the prior art:

(2) In the invention, the information processing module drives the LED on the backlight dot matrix module according to the effective display window calculated by the movement circuit module, and turns off the LED outside the effective display pixel boundary of the television to achieve the purpose of efficiently utilizing the LED on the backlight dot matrix module. . The invention is also compatible with the traditional movement PWM dimming mode and the LOCAL-DIMMING dimming mode, and the dimming function can work in BY In the PASS state.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

A window display device of a screen, wherein the window display device of the screen comprises a movement circuit module, an information processing module and a backlight dot matrix module, wherein the movement circuit module presets an image storage space, and the image storage device The address of the memory cell in the space corresponds to the position of the effective display pixel of the screen;

The movement circuit module receives the information to be displayed and stores it in the image storage space, and the movement circuit module calculates display parameters corresponding to each valid window according to the current information storage situation of the image storage space and feeds back An information processing module, each displayed information corresponding to a valid window;

The information processing module calculates a state value of each LED in the backlight dot matrix module according to the display parameter corresponding to the effective window, and sends the calculated state value of each LED to the backlight dot matrix module;

The backlight dot matrix module controls lighting or turning off of each of the LEDs according to a state value of each of the LEDs.
The window display device of the screen according to claim 1, wherein when the movement circuit module simultaneously receives information to be displayed from a plurality of channels, the movement circuit module is configured according to the identification of the information to be displayed. Obtaining a starting address of the information storage corresponding to the information to be displayed, and sequentially storing the information to be displayed according to the starting address to the storage unit of the image storage space until the received information is all stored in the image storage space.
The window display device of the screen according to claim 1, wherein the information storage situation comprises a starting address of each information to be displayed and a corresponding resolution, and the movement circuit module is specifically configured to: The starting address of each displayed information and the corresponding resolution calculate a display parameter of a valid window corresponding to each displayed information, and the display parameter includes a valid window position and size.
The window display device of claim 1 , wherein the information processing module is configured to reserve an N*M bit storage space, wherein N is a number of backlight dot matrix horizontal LEDs, and M is a backlight dot matrix. a number of vertical LEDs, where the bit address of the storage space corresponds to a physical coordinate position of the LED in the backlight dot matrix module; according to the obtained display parameter of the effective display window of the liquid crystal panel, the LED state in the effective display window is set to “point” "Bright", the LED status outside the effective display window is set to "OFF"; the state of the set LED is correspondingly written to the storage space set by the signal processing module according to the physical coordinate position of the LED in the backlight dot matrix module.
The window display device of the screen according to claim 1, wherein the backlight dot matrix module comprises a plurality of LED matrices and a plurality of constant current driving chips, and the plurality of constant current driving chips are cascaded. connection.
A window display device for a screen according to claim 5, wherein said constant current driving chip and the LED matrix are connected by a trace on the PCB.
The window display device of claim 5, wherein the LED matrix is driven by a single LED low voltage power supply.
The window display device of the screen according to claim 5, wherein the constant current driving chip is configured to receive a control signal output by the signal processing module, and includes an SI interface, a CLK interface, a LATCH interface, and an OE interface, The constant current driving chip receives the state value of the LED output by the signal processing module by the SI interface under the control signal of the CLK interface, and transmits it to the constant current driving channel of each LED of the backlight dot matrix module for temporary storage. In the register, the constant current driving chip inputs the state value of the LED into the driving register of the constant current driving chip according to the control signal of the LATCH interface; the constant current driving chip turns on the constant current driving channel according to the control signal of the OE interface, The state value of the LED is output to the corresponding LED from the corresponding constant current drive channel.
A window display device for a screen according to claim 8, wherein the constant current driving channel of the constant current driving chip is delayed and turned on and off from each other.
A window display device for a screen according to claim 8, wherein said constant current driving chip has a minimum output current width of 20 ns.
The window display device of the screen according to claim 1, wherein the movement circuit module is further configured to: when calculating a display parameter corresponding to each valid window according to a current information storage situation in the image storage space, Or, before the display parameter corresponding to the calculated valid window is sent to the information processing module, if the user needs to set the resolution of the display information, the calculated valid window is adjusted accordingly according to the user requirement.
A window display method for a screen, wherein the window display method of the screen comprises the following steps:

When receiving the information to be displayed, the movement circuit module stores the corresponding information in the image storage space of the movement circuit module, wherein the storage address in the image storage space corresponds to the effective display pixel position of the liquid crystal panel;

The movement circuit module calculates display parameters corresponding to each effective display window of the liquid crystal panel according to the current information storage condition of the image storage space;

The movement circuit module outputs the calculated display parameter of the effective display window of the liquid crystal panel to the signal processing module;

The signal processing module calculates, according to display parameters of each effective display window of the liquid crystal panel, a state value of each LED in the backlight dot matrix module;

The signal processing module controls lighting or turning off of each LED in the backlight dot matrix module according to a state value of each LED in the backlight dot matrix module.
The window display method of a screen according to claim 12, wherein the information storage situation comprises a start address of each information to be displayed and a corresponding resolution, and the movement circuit module according to the image storage space In the current information storage situation, calculating display parameters corresponding to each valid display window of the liquid crystal panel includes:

The movement circuit module calculates display parameters of the valid window corresponding to each displayed information based on the starting address and the corresponding resolution of each displayed information, the display parameters including the effective window position and size.
The window display method of the screen according to claim 12, wherein the signal processing module calculates the state values of the LEDs of the screen according to the obtained display parameters of the effective display window of the liquid crystal panel, including:

The signal processing module sets an N*M bit storage space, where N is the number of horizontal LEDs in the backlight dot matrix module, and M is the number of vertical LEDs in the backlight dot matrix module;

The signal processing module sets the LED state in the effective display window to “lighting” according to the obtained display parameter of the effective display window of the liquid crystal panel, and sets the LED state outside the effective display window to “off”;

The signal processing module writes the state of each LED in the backlight dot matrix module to the storage space set by the signal processing module according to the physical coordinate position of the LED in the backlight dot matrix module, and the bit address of the storage space corresponds to the backlight. The physical coordinate position of the LED in the dot matrix module.
The window display method of a screen according to claim 12, wherein the signal processing module controls the lighting of each LED in the backlight dot matrix module according to a state value of each LED in the backlight dot matrix module Closing includes:

The signal processing module serially inputs the state value of each LED in the backlight dot matrix module stored in the storage space into the driving chipset in the backlight dot matrix module, and the driving chipset in the backlight dot matrix module includes a cascade manner Connected at least one constant current driving chip;

The constant current driving chip drives the corresponding LED to light or turn off according to the state value of the LED.
The window display method of a screen according to claim 15, wherein the backlight dot matrix module further comprises an LED matrix, and the LED matrix and the constant current driving chip are connected by a trace on the PCB.
The window display method of a screen according to claim 16, wherein the LED matrix is driven by a single LED low voltage power supply.
The window display method of the screen according to claim 15, wherein the constant current driving chip is configured to receive a control signal output by the signal processing module, and includes an SI interface, a CLK interface, a LATCH interface, and an OE interface; The constant current driving chip drives the corresponding LED to light or turn according to the state value of the LED, including:

The constant current driving chip receives the state value of the LED output by the signal processing module by the SI interface under the control signal of the CLK interface, and transmits the state value of the LED to each LED of the backlight dot matrix module. In the scratchpad register;

The constant current driving chip inputs a state value of the LED into a driving register of the constant current driving chip according to a control signal of the LATCH interface;

The constant current driving chip turns on the constant current driving channel according to the control signal of the OE interface, so that the state value of the LED is output from the corresponding constant current driving channel to the corresponding LED to drive the corresponding LED to be turned on or off.
The window display method of a screen according to claim 15, wherein the constant current driving chip delays opening the constant current driving channel according to a control signal of the OE interface to prevent the LEDs from being turned on and off at the same time.
The window display method of the screen according to claim 12, wherein the movement circuit module further comprises: when calculating the display parameter corresponding to each valid display window of the liquid crystal panel according to the current information storage condition of the image storage space; :

If the user needs to set the resolution of the displayed information, the calculated valid window is adjusted according to the user's requirement to send the adjusted display parameter to the information processing module.