LED backlight driving chip with signal transmission direction control pin

Abstract

The utility model discloses a kind of LED backlight drive chip with signal transmission direction control pin, the LED backlight drive chip includes first data port DL, second data port DR and data transmission direction setting port DIR;It further includes digital processing unit and data transmission direction control circuit;The data transmission direction control circuit includes first switch unit, second switch unit, multipath data selector MUX1;The LED backlight drive chip can set data transmission port as data input port or data output port according to actual needs, so as to meet LED backlight drive chip can be arranged on LED backlight panel with different rotation angles, and simultaneously exempt from the cumbersome wiring between drive chip.

Description

Technical Field

[0001] This utility model relates to the field of integrated circuit technology, and in particular to an LED backlight driver chip with a signal transmission direction control pin. Background Technology

[0002] like Figure 1 The diagram shows a schematic of a prior art LED backlight panel structure, in which multiple LED driver ICs are arranged in series. Each LED driver IC has a data input terminal and a data output terminal. In the communication link of the series-connected LED driver ICs, the data input terminal of the preceding LED driver IC is connected to the data input terminal of the following LED driver IC. Simultaneously, each LED driver IC has an LED driving channel connected to an LED string, with each LED driving channel connected to one LED string. In the prior art, to achieve a more compact arrangement of LED strings, the LED driver IC needs to be able to connect to both the LED strings arranged above and below it on a single series communication link. However, for the LED driver IC itself, the pin arrangement is fixed and unique. This leads to... Figure 1 The arrangement of the LED driver ICs and LED strings shown is such that LED driver ICs 1-5 are connected to the lower LED string, while ICs 6-9 are connected to the upper LED string. However, this arrangement requires precise placement of ICs 1-9, ensuring that ICs 6-9 are positioned within the gaps between ICs 1-5 and are placed upside down. This undoubtedly greatly increases the manufacturing complexity of the entire LED backlight panel and also makes the wiring more intricate.

[0003] Therefore, it is evident that a new LED backlight driver chip is needed in the current technology, which can define the transmission direction of the data pins as required. Compared with the traditional method, it can solve the defect of the current technology, which is limited by the fixed pin arrangement on the LED driver IC and cannot flexibly place the LED driver IC. Summary of the Invention

[0004] The technical objective of this invention is to provide an LED backlight driver chip with a signal transmission direction control pin. This LED backlight driver chip can set the data transmission port as a data input port or a data output port according to actual needs, thereby allowing the LED backlight driver chip to be arranged on the LED backlight panel at different rotation angles, while eliminating the cumbersome wiring between driver chips.

[0005] According to the above-mentioned technical objective, this utility model provides an LED backlight driver chip, which includes a first data port DL, a second data port DR, and a data transmission direction setting port DIR.

[0006] It also includes a digital processing unit and a data transmission direction control circuit;

[0007] The data transmission direction control circuit includes a first switching unit, a second switching unit, and a multiplexer MUX1; the first data port DL is connected to the output of the first switching unit, the second data port DR is connected to the output of the second switching unit, the data transmission direction setting port DIR is connected to the control terminal of the first switching unit, and the data transmission direction setting port DIR is connected to the control terminal of the second switching unit after passing through an inverter; the input terminal of the first switching unit is connected to the input terminal of the second switching unit, and is also connected to the signal output terminal of the digital processing unit.

[0008] The first data port DL is connected to the first data input terminal of the multiplexer MUX1, the second data port DR is connected to the second data input terminal of the multiplexer MUX1, and the output terminal of the multiplexer MUX1 is connected to the input terminal of the digital processing unit; the data transmission direction setting port DIR is connected to the selection control terminal of the multiplexer to control the multiplexer to select the signal from the first data input terminal for output or select the signal from the second data input terminal for output.

[0009] In one embodiment, both the first switching unit and the second switching unit are OD gate circuits.

[0010] In one embodiment, the LED backlight driver chip further includes: a drive voltage port VCC, a ground port GND, a drive current setting port ISET, and LED drive channel ports CH0~CH3.

[0011] This utility model also provides an LED backlight driving system, which includes a serial communication link consisting of multiple LED backlight driving chips with signal transmission direction control pins connected in series. The data transmission direction setting port DIR of the LED backlight driving chips at odd positions in the serial communication link is connected to a first level signal, and the data transmission direction setting port DIR of the LED backlight driving chips at even positions in the serial communication link is connected to a second level signal opposite to the first level signal.

[0012] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of an existing LED backlight panel structure;

[0015] Figure 2 This is a schematic diagram of the LED backlight panel structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the LED backlight driver chip pinout of the present invention;

[0017] Figure 4 This is a schematic diagram of the data transmission direction control circuit of the LED backlight driver chip of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 2-4 The present invention will be described in further detail below.

[0019] like Figure 3 The schematic diagram shown illustrates the LED backlight driver chip of the present invention. The LED backlight driver chip includes a first data port DL, a second data port DR, a driving voltage port VCC, a ground port GND, a driving current setting port ISET, LED driving channel ports CH0~CH3, and a data transmission direction setting port DIR. The driving voltage port VCC and the ground port GND are the power driving ports of the LED backlight driver chip; the LED driving channel ports CH0~CH3 are used to connect different LED light-emitting element strings to drive the LED light-emitting elements to emit light; the driving current setting port ISET is used to control the driving current of the LED light-emitting elements. The first data port DL and the second data port DR are the data channel ports located on both sides of the chip. The first data port DL and the second data port DR are not specifically designated as data input ports or data output ports, but are determined specifically as data input ports or data output ports according to the control signal of the data transmission direction setting port DIR.

[0020] like Figure 4As shown, the LED backlight driver chip in this embodiment further includes a digital processing unit and a data transmission direction control circuit. The data transmission direction control circuit includes a first switching unit, a second switching unit, and a multiplexer MUX1. Both the first and second switching units are open-end gate circuits. The first data port DL is connected to the output of the first switching unit, and the second data port DR is connected to the output of the second switching unit. The data transmission direction setting port DIR is connected to the control terminal of the first switching unit, and simultaneously connected to the control terminal of the second switching unit via an inverter. The input terminals of the first and second switching units are connected, and simultaneously connected to the signal output of the digital processing unit.

[0021] Simultaneously, the first data port DL is connected to the first data input terminal of the multiplexer MUX1, the second data port DR is connected to the second data input terminal of the multiplexer MUX1, and the output terminal of the multiplexer MUX1 is connected to the input terminal of the digital processing unit. The data transmission direction setting port DIR is connected to the selection control terminal of the multiplexer to control the multiplexer to select the signal from the first data input terminal for output or select the signal from the second data input terminal for output.

[0022] According to such Figure 4The circuit structure shown allows for the following behavior: when the control terminal of the OD gate circuit of the first and second switching units is high, the OD gate circuit is closed, meaning the input and output terminals of the first or second switching units are connected; when the control terminal of the OD gate circuit is low, the OD gate circuit is open, meaning the input and output terminals of the first or second switching units are disconnected. Simultaneously, when the selection control terminal of the multiplexer MUX1 is high, the multiplexer selects to output the signal from the second data input terminal; when the selection control terminal of the multiplexer MUX1 is low, the multiplexer selects to output the signal from the first data input terminal. According to the above settings, when the data transmission direction setting port DIR is high, the first switching unit is in the ON state, the second switching unit is in the OFF state, and the multiplexer outputs the signal from the second data input terminal (i.e., the signal from the second data port DR) to the digital processing unit. The data processing unit then transmits the processed signal to the input terminal of the first switching unit. Since the first switching unit is in the ON state, the signal is output from the first data port DL. That is, when the data transmission direction setting port DIR is high, the LED backlight driving signal is set with the second data port DR as the data input terminal and the first data port DL as the data output terminal, with the data transmission direction being DR→DL. Similarly, when the data transmission direction setting port DIR is low, the LED backlight driving signal is set with the second data port DR as the data output terminal and the first data port DL as the data input terminal, with the data transmission direction being DL→DR.

[0023] Based on the above circuit structure, this embodiment can achieve the following: Figure 2 The LED driving link shown has LED backlight driver chips IC1~IC9 forming a series driving link. The data transmission direction setting ports DIR of LED backlight driver chips IC1, IC3, IC5, IC7, and IC9 use the same first level signal, while the data transmission direction setting ports DIR of LED backlight driver chips IC2, IC4, IC6, and IC6 use a second level signal that is opposite to the first level signal.

Claims

1. An LED backlight driver chip with a signal transmission direction control pin, characterized in that, The LED backlight driver chip includes a first data port DL, a second data port DR, and a data transmission direction setting port DIR. It also includes a digital processing unit and a data transmission direction control circuit; The data transmission direction control circuit includes a first switching unit, a second switching unit, and a multiplexer MUX1; the first data port DL is connected to the output of the first switching unit, the second data port DR is connected to the output of the second switching unit, the data transmission direction setting port DIR is connected to the control terminal of the first switching unit, and the data transmission direction setting port DIR is connected to the control terminal of the second switching unit after passing through an inverter; the input terminal of the first switching unit is connected to the input terminal of the second switching unit, and is also connected to the signal output terminal of the digital processing unit. The first data port DL is connected to the first data input terminal of the multiplexer MUX1, the second data port DR is connected to the second data input terminal of the multiplexer MUX1, and the output terminal of the multiplexer MUX1 is connected to the input terminal of the digital processing unit; the data transmission direction setting port DIR is connected to the selection control terminal of the multiplexer to control the multiplexer to select the signal from the first data input terminal for output or select the signal from the second data input terminal for output.

2. The LED backlight driver chip with signal transmission direction control pin according to claim 1, characterized in that, Both the first and second switching units are OD gate circuits.

3. The LED backlight driver chip with signal transmission direction control pin according to claim 1, characterized in that, The LED backlight driver chip also includes: a drive voltage port VCC, a ground port GND, a drive current setting port ISET, and LED drive channel ports CH0~CH3.

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