TW200901429A - By-pass circuit, and electronic apparatus and display panel applying the same - Google Patents

Abstract

A by-pass circuit and electronic apparatus and display panel applying the same. The by-pass circuit is coupled to an electric device in parallel, wherein the electronic device has a first terminal and a second terminal, and the by-pass circuit includes a thyristor, a first impedance element, and a second impedance element. The thyristor has an anode, a cathode, and a gate electrode, wherein the anode and the cathode are coupled to the first and the second terminals of the electronic device. The first impedance element is coupled between the gate electrode of the thyristor and the first terminal of the electronic device. The second impedance element is coupled between the gate electrode of the thyristor and the second terminal of the electronic device. A malfunctioned electronic device in a serial of electronic devices can be by-passed through the by-pass circuit to keep other electronic devices on the serial in function.

Description

200901429 P060807BEZ1TW 23173twf.d〇c/p IX. Description of the Invention: [Technical Field] The present invention relates to the design of a protection circuit, and in particular to a circuit design and application with a bypass function. To maintain a properly functioning electronic device. [Prior Art] The liquid crystal display is the mainstream product in the current flat panel display market, and f) mainly displays the kneading surface by the backlight provided by the liquid crystal display panel and the backlight module. Most of the early backlight modules used fluorescent tubes as the light source. However, due to their short lifespan, low power consumption, and vulnerability to external forces, they are gradually changing to Uigh Emitting Diode. , LED) as a light source of the backlight module. Taking a direct-lit backlight module as an example, a plurality of light-emitting diodes arranged in an array are used to provide a light source. 1 and 1B show the circuit architecture of a conventional moonlight module. As shown in FIG. 1A, a plurality of LEDs 112 are connected in series to form a plurality of LED arrays 110, and these LEDs are U-poles. The body strings 11 are arranged side by side to form an array. Each light-emitting diode string j 〇 is connected to the booster GGst CilxUit) l2G touch (four) Wei (c〇nstant Current Circuit) 130 'currently drives each of the light-emitting diodes 110 The light-emitting diode H2 emits light. However, as shown in FIG. 1B, since such a structure is connected in series to the light-emitting body, when one of the light-emitting diodes is listed in the HQ, one of the light-emitting diodes 112 is disabled ( If burned, it will be connected so that the LEDs are in series 110, forming an open state, and 3 cannot be positive. 5 200901429 P060807BEZ1TW 23173twf.d〇c/p Often: The failure of the string diodes will be The other light-emitting diodes 112 on the ?-optical body array 11G are caused to affect the normal display of the liquid crystal display. White "," law light, and in addition to the backlight module, other applications of light-emitting two, such as LED display panels or light-emitting diodes or the application of other types of electronic components of the array of electronic, can not be Effectively improve its reliability. Set the 'white presence: 【Invention> The Thunder's generation bypass line' can bypass the electronic component series and bypass the device, so that other electronic components maintain the other invention. Regarding the application of the above-mentioned bypass sub-segment: by r the bypass line to improve the overall electronic component by means of the display panel thus, the operation of the display unit can be often displayed. The content of the present invention is described from the maintenance of other positive pots f This proposed a bypass line that can be connected in parallel with the -electronic component. A bypass line, f: 'and the bypass line includes - a closed body on the piece and a 篦 - shovel - AL J first impedance Han Diyi There are several impedances. The thyristor has a gate and a gate, wherein the anode is lightly connected to the first sand of the electronic component, and the cathode is connected to the second end of the electronic component. The cathode is electrically connected to the electronic component. The first piece is connected to the thyristor In the embodiment of the invention, the bypass line further includes a third impedance element coupled to the idle current of the body The first end of the electronic component is between the anode and the anode of the thyristor. In one embodiment of the invention, the gate fluid may be a Silicon Controlled Rectifier (SCR) or a bipolar ten junction transistor (Bipolar). Junction Transistor, BJT) or MOS semi-conductive field effect transistor

Me (Metal Oxide Semiconductor Field Effect Transistor MOSFET). ’

In an embodiment of the invention, the electronic component comprises a light emitting diode. X In one embodiment of the present invention, the driving voltage of the electronic component is Vf, the resistance of the first impedance component is R2 of the second impedance component, and the threshold voltage of the thyristor is VgthSVfxR2/(Rl+R2) . Lei Zi ίίί proposed - electronic device for limb-like correction. This electronic St has a series of electronic components and can be used for this bypass circuit

The function of bypassing provides the function of bypassing, so that the same-string two pieces maintain normal operation. They eight his electronic 7L board package should also be suede, in the panel. This display is 1u, the shoulder is not early and at least one bypass line, the second two: Ζ Ζ : : 列 列 列 列 列 列 列 列 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; In this case, when the early failure occurs, the function of the side of the 200901429 P060807BEZ1TW 23173twf.doc/p is provided to maintain the normal operation of the overall display panel. Based on the above, the bypass circuit of the present invention can bypass the failing electronic components, so that other electronic columns 'will help to improve the application of the bypass circuit such as 趟, surface array light source, display panel, etc. ο It is easy to understand that the above and other objects, features and advantages are more apparent. Specifically, the embodiment 'and the formula _, for detailed description ^ [Embodiment] The anti-element is connected in series with the second impedance element: the electric and the first-resistance is between the first-impedance element and the second impedance, wherein Into the tender, as the gate of the thyristor. The :::: The critical electric current of the terminal voltage fluid passes through the current of the failed electronic component: Second, the other electronic components that should have been serialized can be dimensioned, and the body is made so that the same source will be cut again: 'When electricity is taken as an example, the description of its material list is for illustrative purposes only and is not intended to limit the invention: side: line 200901429 P060807BEZ1TW 23173twf.doc/p. In other words, the above-mentioned electronic components widely include light-emitting elements, display elements, and the like, and other light-emitting diode display panels having similar series circuit structures, light-emitting diode array surface light sources, or other types of electronic component arrays. The bypass circuit of the present invention can be applied to the electronic device to improve the reliability of the overall circuit. 2A and 2B illustrate an array of light emitting diodes having a bypass function according to an embodiment of the present invention. In this embodiment, the LED array 2 includes a plurality of LED arrays 210 arranged side by side, and each LED array 210 is connected in series by a plurality of LEDs 212. to make. The LED array 200 can be applied, for example, to a backlight module of a liquid crystal display, a general lighting fixture, or a light-emitting diode display panel. Each of the light emitting diodes 210 is, for example, stolen between the booster circuit 220 and the turbulent source circuit 230, and electrically drives the light emitting diodes 212 on each of the light emitting diode strings 21 to emit light. Further, in order to realize the function of the bypass, each of the light-emitting diodes 212 is connected in parallel with a switching element 240. As shown in FIG. 2A, if each of the G-emitting diodes 212 on the LED array 2 is operating normally, the switching element 240 connected in parallel will be in an open state, so that current flows through the LED array. Each of the light-emitting diodes 212 on the 21 驱动 drives the light-emitting diode 212 to emit light. In addition, as shown in FIG. 2B, when one of the light-emitting diodes is in series 21〇, one of the light-emitting diodes 2U is ineffective (such as Lin), shaped, and the failed light-emitting body = 2U, The parallel switching elements 240 are turned "to allow current to flow through the switch member 240 while maintaining the normal operation of the other LEDs 212 on the same LED array 21". ', 200901429 P060807BEZ1TW 23173twf.doc/c 22. The above embodiment can also actively control the illumination with =, = select 'even if the LED 212 does not pass' to make certain specific light-emitting diodes S body = = === Dynamic drive, for example, can be used as a dynamic display source when applied to a backlight module board. As shown in Fig. 3: two 22 = a plurality of light-emitting strings Vdc. The mother-emitting diode 312 has a first end "for parallel connection with the bypass line 340, and the bypass element 346 Ϊ: the fluid I42, the first impedance element 344 and the second impedance ^ „ -2 ^ gate body 342 has an anode 342a, a cathode 342b, a cathode 2, and an anode 3 is connected to its corresponding light-emitting surface 312a' and a cathode 342b is coupled to its corresponding f; The first impedance element 344 is secreted from the gate of the body 342 and the first end of the light-emitting diode 312. The material is =====342 _ diligence as shown by f 3A 'in the normal state, the thyristor 342 is in the off: Forgiveness, the current Wc provided by Mao Liyuan Vdc can flow smoothly through the hair--one LED array on each of the LEDs on the 31 〇. The first impedance 344 and the second impedance element 346 can divide the terminal voltage of the light-emitting diode 200901429 P060807BEZ1 Tw 23 ] 73 twf.doc/p voltage Vf as the gate voltages Vgi VVgn of the thyristor 342. In the present embodiment, the threshold voltage of the thyristor 342 can be set to achieve the bypass effect. Assuming that the resistance of the first impedance element 344 is a ruler, the resistance of the second impedance element 346 is R2, and the threshold voltage of the thyristor 342 is Vgth, the threshold voltage Vgth of the thyristor 342 can be set to:

Vgth^VfxR2/(Ri+R2) ° In more detail, as shown in FIG. 3B, when the light-emitting diode 312 fails and causes an open circuit, the terminal voltage Vf of the terminal voltage Vf after the voltage division is greater than the gate. The threshold voltage of the body 342', which in turn triggers the thyristor 342, conducts. Thus, the current that should have passed through the failed LED 312 will be changed to the gate fluid 342 flowing through the bypass line 340, so that the other LEDs 312 on the same series can maintain normal operation. It is worth noting that, based on the iatch characteristic of the idle fluid 342' itself, when the thyristor 342 is turned on, as long as a current is passed, even if the gate voltage Vg2 is lower than the threshold voltage, the thyristor 342 is caused. The state of the path continues to be maintained until the current idc supplied by the voltage source Vdc is zero, and the thyristor 342 is again turned off. In addition, please refer to FIG. 4, which illustrates an architecture of a bypass line according to another embodiment of the present invention. In order to avoid excessive current flow through the thyristor 342, the present embodiment may further configure a third impedance element 348 between the anode 342a of the thyristor 342 and the voltage source Vdc to control the magnitude of the current through the gate & body 342. The other elements of this embodiment are similar to the above-described embodiments, and similar effects can be achieved. For the description thereof, please refer to the above embodiments, which will be described herein. The sluice fluids mentioned in the foregoing various embodiments include various types of components, including, for example, a controlled rectifier, a bipolar junction transistor, or a 11 Ο ο 200901429 P060807BEZ1TW 23173 twfdoc/p MOS transistor. A component that has the same effect. In addition, the photodiode series can be used as an explanation, and the illuminating diode array can be used to display the front electrode array. In the light source shown in Fig. 2A, the present invention proposes that the electronic component string can be used for various electronic devices to maintain normal operation of other electronic components. ^路' in the backlight module or surface array light source (such as lighting ^ ^ Ming: rely on the operation of the bypass line to generate dynamic light source = product display ' and can provide more by the operation of the bypass line The present invention has been disclosed in the above embodiments, but it is not the invention, and any person having ordinary knowledge in the art can make some changes and refinements without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended patent application. [FIG. 1A and 1B show a circuit diagram of a conventional backlight module. FIGS. 2A and 2B illustrate the present invention. An embodiment of the present invention is an array of light-emitting diodes having a value of =. Functional Figures 3A and 3β illustrate a bypass structure of an embodiment of the present invention. Figure 4 illustrates another embodiment of the present invention - Bypass line structure. Wood [Main component symbol description] 12 200901429 P060807BEZ1TW 23173twf.doc/p 110, 110': Light-emitting diode series 112, 112': Light-emitting diode 120: Boost circuit 130: Constant current Source circuit 200: LED array 210, 210': light-emitting diode series 212, 212': light-emitting diode 220: boost circuit f ^ 230: constant current source circuit 240, 240': switching element 310: light-emitting diode series 312, 312': light-emitting diode 312a: first end 312b of light-emitting diode: second end 340, 340' of light-emitting diode: bypass line 342, 342': thyristor 342a: anode 342b: cathode 342c: Gate 344: first impedance element 346: second impedance element 348: third impedance element

Vdc: voltage source

Idc: current

Vgl~Vgn: gate voltage 13

Claims (1)

200901429 P060807BEZ1TW 23173twf.doc/p X. Patent application scope: 1. A bypass circuit, in parallel with an electronic component, the electronic component has a first end and a second end, and the bypass line includes a gate fluid (Thyristor) having an anode, a cathode, and a gate, wherein the anode is coupled to the first end of the electronic component, and the cathode is coupled to the second end of the electronic component; a first impedance component Between the gate of the thyristor and the first end of the electronic component; and a second impedance component coupled to the gate of the thyristor and the second end of the electronic component between. 2. The bypass circuit of claim 1, further comprising a third impedance element coupled between the first end of the electronic component and the anode of the thyristor. 3. The bypass circuit according to claim 1, wherein the gate body comprises a siiicon Controlled Rectifier (SCR), a Bipolar Junction Transistor (BJT) or Metal Oxide Semiconductor Field Effect Transistor (MOSFET). 4. The bypass circuit of claim i, wherein the electronic component comprises a light emitting diode. 5. The bypass circuit according to claim 1, wherein the driving voltage of the electronic component is Vf, the resistance of the first impedance component is [...], and the resistance of the second impedance component is R2' The threshold voltage of the thyristor is Vgth, and VgthgVfxR2/(Rl+R2). ' 14 200901429 P060807BEZ1TW 23173twf.d〇c/p 6-way function electronic device, including: where each - string of electronic components are connected in series, at least - bypass line has and sr element bypass line includes: And the parallel connection, the two-gate fluid having an anode, a cathode and a gate to the first end of the electronic component, and the cathode 4 is connected to the second end of the electronic component; coupling the first impedance An element coupled between the first end of the gate electronic component of the thyristor; and the second impedance component coupled to the second end of the gate electronic component of the thyristor between. </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Between the anodes. Ο 8. The electronic device with bypass function as described in claim 6 of the patent scope includes a 矽-controlled rectifier, a bipolar junction or a MOS field effect transistor. (4) 9. An electronic device having a bypass function as described in claim 6 wherein each of the electronic components includes a light emitting diode. 10. The electronic device with bypass function according to claim 6, wherein the driving voltage of each electronic component is Vf, the resistance of the first impedance component is R1, and the resistance of the second impedance component is R2, the threshold voltage of the thyristor is Vgth, and VgthSVfxR2/(Rl+R2). 15 200901429 P060807BEZ1TW 23173twf.doc/p 11. A display panel comprising: a plurality of display units, wherein the display units are connected in series with each other, wherein each of the same and one end is The second end; 4 is not earlier than 7 〇 has at least one bypass line, and the display unit 1 square circuit includes: “medium-parallel, the thyristor fluid has an anode, the cathode is lightly connected to the cathode The first and the -_ of the display unit are connected to the second end of the display unit; and the cathode is a first impedance element coupled to the first portion of the display unit; and the gate core is The second impedance element is coupled between the second end of the thyristor display unit. The gate is further included with the f-circuit as described in claim n. Heart = plate: wherein the first end is between the anode and the anode of the thyristor. The item is not early. 13. As described in the scope of claim U, the body includes a commutator, a bipolar connection. Wherein the effect transistor. 曰 体 or MOS semi-conductive field 14. A single Tt includes a light-emitting diode according to one of the scopes of the patent application, and a '(four) plate, wherein each of the driving voltages of the display unit as described in item n of the patent application scope is Vf, the first-resistance, wherein each R1, the electric resistance of the second impedance element is the resistance of the R2 piece is vgth, and the threshold voltage of the__ fluid is 16