CN104361865B - A kind of LED mosaic screens driving structure - Google Patents

Abstract

The embodiment of the present invention discloses a LED splicing screen driving structure, which realizes the application of a multi-channel driving chip to multiple display units, and solves the problem that the number of channels used by each display module of the existing LED splicing screen is too large. It is far lower than the number of thousands of channels that the driver chip possesses, thus causing a technical problem that all the channels of the driver chip cannot be fully utilized. The embodiment of the present invention includes: several display units are spliced, and at least two display units are connected to one driver chip; the number of channels of the driver chip is evenly distributed to the display units.

Description

A driving structure of LED splicing screen

technical field

The invention relates to the technical field of LEDs, in particular to an LED splicing screen driving structure.

Background technique

With the rapid development of science and technology, the application of LED display is getting more and more in-depth. Generally, LED display is to mount LED particles on the PCB substrate and drive it through the LED driver chip. However, the number of channels of an LED driver chip is only Only 16 channels can be achieved. Therefore, for example, when the resolution of LED display modules is generally 120×120, the number of channels required is at least 360, so the number of LED driver chips that need to be configured will be large. At the same time, when COG (chip on glass, the chip is directly bound on the glass) technology is combined with the LED screen, in other words, the LED driver chip is bound on the glass substrate, and the LED driver chip is bound to the glass substrate. The structure on the screen is similar to that of AMOLED, that is, TFT (thin film transistor) is used to drive light emission on the glass. Therefore, the application of COG technology on the LED screen requires the integration of the AMOLED structure for implementation.

At present, the existing driver chips bound on glass are usually developed on the basis of TFT LCD, and the number of channels of the driver chip can reach hundreds, for example, the resolution of the display screen is 1366×768, The number of channel channels of the required driver chip should be 1366×3=4098 channel channels, and at least three driver chips with thousands of channel channels are required to drive the display screen with a resolution of 1366×768, based on LED The number of channels used by each display module of the splicing screen is far lower than the number of thousands of channels that the driver chip has. Therefore, not all channels of the driver chip can be fully utilized, so for multiple Whether the utilization of the channels can satisfy the full utilization is the most concerned research at present. Therefore, the purpose of the present invention is to solve the problem of fully utilizing the multi-channel channels of the driver chip.

Contents of the invention

The embodiment of the present invention provides a LED splicing screen driving structure, which realizes that a multi-channel driving chip is applied to multiple display units, because the number of channels used by each display module of the existing LED splicing screen is far lower Due to the thousands of channels of the driver chip, there is a technical problem that all the channels of the driver chip cannot be fully utilized.

An LED splicing screen drive structure provided by an embodiment of the present invention is composed of several display units, at least two of which are connected to a drive chip;

The number of channels of the driver chip is evenly allocated to the display units connected thereto.

Preferably,

The driving chip is an LCD driving chip.

Preferably,

The LCD driver chip is a source driver chip.

Preferably,

A voltage follower is also connected between the input terminal of the display unit and the driving chip.

Preferably,

The driving chip is connected with the display unit through FPC.

Preferably,

The FPC is connected to the PCB substrate on the bottom surface of the display unit.

Preferably,

The FPC is connected to the PCB substrate in a binding manner.

Preferably,

The FPC is connected to the PCB substrate by a board-to-board connector.

Preferably,

There are four display units.

Preferably,

At least one voltage follower is connected between the input end and each channel output end of the driver chip.

It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

An LED splicing screen driving structure provided by an embodiment of the present invention includes: a plurality of display units are spliced together, at least two display units are connected to a driving chip; display unit. In this embodiment, by using the multi-channel characteristics of a driver chip, it is connected to at least two display units among the plurality of display units of the LED splicing screen, and a plurality of channels of the driver chip are evenly allocated to the driver chip to connect The display unit realizes a driver chip with hundreds of channels to drive multiple LED display units, which solves the problem that the number of channels used by each display module of the existing LED splicing screen is far low Due to the thousands of channels of the driver chip, there is a technical problem that all the channels of the driver chip cannot be fully utilized.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts.

Fig. 1 is a structural schematic diagram of an LED splicing screen driving structure provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a front view structure of an LED splicing screen driving structure provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of a rear view structure of an LED splicing screen driving structure provided by an embodiment of the present invention.

detailed description

The embodiment of the present invention provides a LED splicing screen driving structure, which realizes that a multi-channel driving chip is applied to multiple display units, because the number of channels used by each display module of the existing LED splicing screen is far lower Due to the thousands of channels of the driver chip, there is a technical problem that all the channels of the driver chip cannot be fully utilized.

A voltage follower is also called a Unity-Gain Buffer. It is actually the incarnation of a non-inverting amplifier. It just turns the feedback resistance to zero, so that the output voltage is directly fed back to the inverting input.

FPC, flexible circuit board is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film as the base material. Referred to as soft board or FPC, it has the characteristics of high wiring density, light weight, thin thickness and good bendability.

TFT means that each liquid crystal pixel on the liquid crystal display is driven by a thin film transistor integrated behind it.

In order to make the purpose, 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figure 1, an embodiment of an LED splicing screen driving structure provided for an embodiment of the present invention includes:

It is composed of several display units 1 spliced together. It should be noted that the aforementioned display unit 1 is mounted or welded on the substrate of the display unit by several LED particles;

At least two display units 1 are connected to one driver chip 2. It should be noted that the aforementioned driver chip is an LCD driver chip, and further, the LCD driver chip is a source driver chip, such as a TFT-LCD driver chip;

The number of channels of the driver chip 2 is evenly allocated to the display unit 1 connected to it. It should be noted that, when the resolution of the display unit 1 is 120×120, since the LED particles are RGB three primary colors, then The number of channels required is 120×3=360 channels. Correspondingly, the display unit 1 with 360 channels can be evenly distributed by the number of channels of the driver chip 2. Today, determine the connection with the driver chip 2. The number of display units 1 is not specifically limited here.

In this embodiment, when the channel channel number of the aforementioned one driver chip 2 is 1440 channel channels, further, the 1440 channel channels are evenly distributed to at least two display units 1 connected to one driver chip 2, for example, with When there are two display units 1 connected to one driver chip 2 , the channels of each display unit 1 need to be allocated as 360 channels, which are not specifically limited here.

It can be understood that, in this embodiment, a voltage follower 5 is also connected between the input terminal of the display unit 1 and the drive chip 2, so that the voltage of several LED particles of the display unit 1 can be increased. Further, as shown in FIG. 2 and FIG. 3, a voltage follower 5 is connected to the branch between each display unit 1 and the driver chip 2. It should be noted that the input terminal of the aforementioned display unit 1 is connected to each channel of the driver chip. At least one voltage follower 5 is connected to the channel output end.

As shown in Figures 1 to 3, the driver chip 2 is connected to the display unit 1 through an FPC (flexible circuit board) 3, and further, the FPC3 is connected to the PCB substrate 4 on the bottom surface of the display unit 1. It should be noted that the PCB substrate 4 It is the aforementioned substrate on the bottom surface of the display unit 1 on which several LED particles are mounted or soldered.

The aforementioned FPC3 is connected to the PCB substrate 4 in a binding manner. It should be noted that the binding manner can be the binding manner of ordinary FPC3 heated and pressurized, which is not specifically limited here;

and / or

The aforementioned FPC3 and the PCB substrate 4 are connected by a board-to-board connector. It can be understood that the aforementioned board-to-board connector can be provided with connectors at both ends to connect with the FPC3 and the PCB substrate 4 respectively, which is not specifically limited here. .

As shown in Figure 2, when the driver chip 2 is a driver chip 2 with 1440 channel channels, the resolution of the display unit 1 may be, for example, 120×120, and the required number of channel channels is 120×3=360 channels, the driver chip 2 with 1440 channels can provide channels for four display units 1 with 360 channels, which is not specifically limited here.

For ease of understanding, the connection relationship of the LED splicing screen drive structure shown in Figure 2 is described in detail below in a specific application scenario. Application examples include:

a) Determine the channel channel quantity of the driver chip 2, for example, the channel channel quantity of the driver chip 2 is 1440 channel channels usually possessed by the TFT-LCD driver chip;

b) Determine the resolution of the display unit 1 of the LED splicing screen, for example, 120×120, and the number of channels required is 120×3=360 channels;

c) According to the number of channels of the driver chip 2 and the resolution of the display unit 1 of the LED splicing screen, determine the number of display units 1 that can be evenly allocated to the number of channels of a driver chip 2, for example, TFT-LCD driver chips with 1440 channels can be evenly distributed to 4 display units 1 with 360 channels;

d) Connect the channel channel output terminal of the driver chip 2 to the input terminal of the channel channel of the display unit 1, in order to make the driving voltage thrust of each output terminal enough to meet the normal light emission of the LED particles at the input terminal of the channel channel of each display unit, It can be that at least one voltage follower 5 is connected between the input end of the display unit 1 and the output end of each channel of the driver chip. It should be noted that the number of voltage follower 5 can be connected according to the LED splicing screen itself The performance is set, and there is no specific limitation here.

An LED splicing screen driving structure provided by an embodiment of the present invention includes: it is composed of several display units 1, at least two display units 1 are connected to one driving chip 2; the number of channels of the driving chip 2 corresponds on average to Assigned to the display unit 1 connected to it. In this embodiment, by using the multi-channel characteristics of a driver chip 2, it is connected to at least two display units 1 among the plurality of display units 1 of the LED splicing screen, and the multiple channels of the driver chip 2 are evenly allocated to The display unit 1 connected to the driver chip realizes a driver chip 2 with hundreds of channels to drive multiple LED display units 1, which solves the problems caused by each display module of the existing LED splicing screen. The number of channels is much lower than the number of thousands of channels provided by the driver chip, thus causing a technical problem that all the channels of the driver chip cannot be fully utilized.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A driving structure for an LED splicing screen, which is composed of several display units spliced together, characterized in that, At least two of the display units are connected to one driver chip; The number of channels of the driver chip is evenly allocated to the display unit connected to it; The driver chip is an LCD driver chip; The LCD driver chip is a source driver chip; A voltage follower is also connected between the input end of the display unit and the drive chip; At least one voltage follower is connected between the input end and each channel output end of the driver chip. 2. The driving structure of the LED splicing screen according to claim 1, wherein the driving chip is connected to the display unit through an FPC. 3. The driving structure of the LED splicing screen according to claim 2, wherein the FPC is connected to the PCB substrate on the bottom surface of the display unit. 4. The LED splicing screen drive structure according to claim 3, wherein the FPC is connected to the PCB substrate in a binding manner. 5. The LED splicing screen driving structure according to claim 3, wherein the FPC is connected to the PCB substrate by a board-to-board connector. 6. The LED splicing screen driving structure according to claim 1, characterized in that there are four display units.