TWM244703U - Multi-lamp LCD backlight control protection device - Google Patents

Description

M244703 ^^ 922J2167

Year 4 Creation Instructions (1) [Technical Field of the New Type] This creation relates to a multi-lamp liquid crystal display backlight control protection device, especially a light source detection method to detect whether the lamp is normal, ^ = lamp When the circuit is abnormal or open, the driver circuit can immediately stop outputting high = ^ [Previous technology] With the continuous increase in the size of liquid crystal displays, the relative control of electric meters has also continued to complicate. For its requirements and functions on backlight power, To ::: When complete. Due to the large size of the LCD display, the number will increase greatly, so there will be a lot of problems: ^ surface current operation problems, especially about the problem of open circuit when the lamp tube is faulty, and how to protect it, β, early, The fluorescent tubes used in the backlight of LCD monitors are controlled by a small number and the required functions are relatively simple. Therefore, they have not paid much attention to the design of the protection circuit. They are special, /, 0 in the consumer market. A lot ... its: =:; =, count. With the increase and increase, the design of protection has continued to be mixed. At present, the large-scale LCD display is stricter than J 0 and its protection function is more stringent than before. TV design and design complexity. I have also added a lot of circuits

Most of the LCD backlight driver companion designs are mostly open: "Motion protection circuit, which occupies the use of 70 knives of the entire circuit, and it is not easy. 4I 4th U 鬲 Quality 'Most of its protection purposes are : The high-wish question on the product and the short of simulating the human body's electric shock: ㈣: i is based on the voltage and electricity of the lamp # Μ ϋ Ϊ Therefore, the typical design-electrical state, and

M244703 Case No. 92212167 Fourth, creative instructions (2) Implementation of protection functions. The driving circuit protection device for the backlight of a general LCD monitor is shown in the first example, which includes a lamp current detection circuit i 6, 丄 7 and a lamp] test circuit 1 8, 19. The step-down circuit J of the voltage detection device 2 reduces the high output drive voltage of the transformer to a level signal that can be detected by ordinary low-voltage components by two voltage-dividing impedances. This method can be applied by the detected voltage. Determine whether the current potential is normal operation or an open or short circuit occurs in the lamp. The current detection device 2 is a current sensing element connected in series to the current path of the liquid crystal backlight tube, and detects the current status of the tube 2 of the lamp. Therefore, through the current debt measurement device, the lamp can be known. Tube current status. Because = it is necessary to determine that the current lamp has an open circuit :: = = the circuit of the detection circuit 18, " and the voltage detection device 21 1 = = electrical muscle detection circuit 1, 6, 17 and current detection Install the light tube 2 3 Z. Therefore, the protective circuit device 2 2 can be activated so that there is no longer a voltage wheel = moving line protection countermeasures on the back, and the transformer 2 4 Please refer to No. 10 One Plus for the single lamp. As shown in FIG. 2, the protection device of FIG. 1 is an embodiment in which needles are currently used, and FIG. 2 is an embodiment of two lamps. It takes a considerable amount of electricity to design and improve the protection system. In terms of protection, it can make the operation methods of the transformer, the current detection element, and the protection circuit more efficient. The backlight lamp used has a cost-effective component 11 especially for the parallel operation of multiple lamps, the [new content] is a multiplier

MZ44 / UJ --- Case No. 922121R7 IV. Creation Instructions (3) '^ ~~' 'The main purpose of this creation is to multiply the components used, and the protective device with the same function can be used to enlarge the size of the crystal display. Need to design with surplus light source system. In order to achieve the above purpose, the original protective device includes: a liquid. At least one or more of the above-mentioned driving wire lamp tube, at least one or more before receiving 1'-receiving 10% input from the aforementioned sensing unit 'using sensing light Source persistence, cut, output 'to ensure the use of the drive circuit. [Embodiment] The detailed description of this creation is as follows: Please refer to the "Figure 3" figure, as shown in the figure: this creation has many. Includes: a liquid crystal display moving line) 1, at least one or more • The lamp tube 2 driven by the driving line 1, > the sensing unit 3 of the generated light source, and the protection unit 4 of the sensing signal, the driving line 1 is not broken Continue to provide * life. The above-mentioned driving circuit 1 £ _L 倏 倏 正 _ — As the number of lamp tubes increases, so the use of components is reduced and has the goal of improvement. This can be used to simplify the future of large-scale liquid crystal display systems. Liquid crystal display backlight Controlled crystal display backlight tube driving circuit, circuit connection, and the driving circuit constructed by the protection unit of the sensing signal from the sensing unit of the light source generated by the lamp tube driven by the driving circuit no longer continues to provide high voltage life. And the technical content, now in accordance with the circular style, this is a single lamp of this creation, which indicates the lamp liquid crystal display backlight control protector backlight lamp driving circuit (hereinafter referred to as the driver is connected to the aforementioned driving circuit 1, and & at least one or more Receiving the aforementioned lamp tube 2 and receiving the rotation structure of the aforementioned sensing unit 3, using the characteristics of the sensing light source, cutting the high voltage output to ensure the driving circuit 1

It ’s a traditional skill.

Page 7 M244703

According to Uli ^ 212167 creation description (4), the driving circuit 1 is used to provide the lamp tube 2 and the high voltage output from the driving circuit 1 described above, and the sensing unit 3 is used to modify

The protection unit 4 is used to receive the sensing unit 3 after the driving circuit 1 is turned on and the lamp tube 2 is driven. When the light source of the lamp tube 2 is detected, a signal is output when the sensing unit 3 senses. 2 When a fault occurs or a signal is issued to inform the drive line system and the above sensing movement, it will be generated. The lamp protection unit is open circuit 1 and the circuit is stopped 1 〇 Please refer to the figure, an additional set of drive sensing is shown in the figure Unit 3 When the two sensing units do not light up, 4, this protection is electrical, to ensure that you refer to it, as shown in the figure "Figure 4": This embodiment is connected to the upper moving line 1a, lamp, and 3a respectively 3 or 3 a As long as the sensing unit 3 or unit 4 is provided, immediately drive the drive circuit 1 or 1 "shown in Fig. 5": This embodiment uses a high-voltage electric wheel to drive the circuit and drive it out of the wheel 1; Regarding the signal of the sensing unit 3; when a high voltage and a light source are generated, when the measuring unit 3 is not a light source of 2, and 4 receives this state, the protection only outputs high voltage, which is the first part of this creation. 1 the same f 2 a, sensing to the same one, one sensing, 3 a round out a beacon line 1 1 3 0 'is a single drive circuit end connection created by this creation and driven by: the output end of the light source is connected, the lamp tube 2 is electrically driven, and when the sensor unit 3 emits any signal, the sensor unit 3 stands When the number and the number, you can know that Yuan 4 also immediately turns out 'to ensure the two lamp tubes of the drive line'. The difference is in unit 3a, and on the two protection units 4, when a lamp 2 or 2a starts the protection unit a.Stop the output of high voltage multiple lamps. 1 Connect multiple lamps M244703

Fourth, the creation description (5) 2, and also uses multiple sensing units 3 to sense multiple lamps 2. The multiple sensing units 3 are commonly connected to a protection unit 4. When any of the multiple lamps 2 occurs In the case of a fault or a road condition, there will be no continuous light emission, so the light source sensing unit 3 cannot detect its light emission, and it can be known that the backlight 2 of the LCD monitor has failed, so it can Actuating the protection unit 4 causes the driving circuit 1 to stop outputting high voltage power.凊 Refer to "shown in Figures 6 and 7", which is a schematic diagram of the parallel and grounding of multiple lamps in this creation. As shown in the figure: the driving circuit of the backlight tube of the liquid crystal display of this embodiment is a conventionally known driving circuit b, 丄 c, the purpose of which is to supply the power supply of the backlight tubes 2 b, 2 c of the liquid crystal display, and the liquid crystal display The backlight tubes 2 b and 2 c are also commonly used cold cathode fluorescent lamps (CCFL) or new external electrode fluorescent lamps (External Eiectrode FluOrescent Ump, EEFL). Is a light-emitting device. Therefore, the current operating states of the lamps 2 b and 2 c can be obtained by the sensing units 3 ^ and f =, and the protection of the protection unit 4 is used as the protection for judging that the lamps 2 b and 2 c are open. 〇Read more in Figures 3 and 8 ", this is a single lamp created in this creation ^ timing diagram of Figure 3. As shown in the figure: when it is normal at the beginning, the situation is that at this time, the lamp tube 2 is supplied with a high-voltage AC voltage 5 and the lamp tube 2 draws 2 AC current 6, so the sensing unit 3 senses the lamp tube. 2 The state of light emission 7 is high, so the protection unit 4 is in a non-operation state 8. When the open circuit state 9 of the lamp 2 occurs, the high-voltage AC voltage of the lamp 2 is maintained, and the lamp 2 is supplied to the lamp, but the open lamp 2 cannot continue to draw traffic.

M244703

Case No. 92212167 Fourth, the creation instructions (6) The current 1 1, so the lamp 2 no longer emits light, so the state becomes low level 12, at this time the protection unit 4 2 = unit 3 state 13. Sentence Sentence When the protection unit 4 judges this situation as the actual lamp 1 4, the protection unit 4 is activated to make the drive J open circuit and the AC voltage 15. Then continue to supply Gao 凊 Refer to "shown in Figure 9", which is another ~ of this creation. As shown in the figure: this embodiment uses a driver to illustrate the embodiment, 1! To drive a single lamp 2 (1, 26, 2 m 1) ^ 1 e 3 d, 3 e, 3 f to sense the aforementioned lamp When the tube 2 d and 2 冋 are measured by the sensing unit: the signals sensed by the element 3 ′, 3 e, and 3 f are divided into two:: 佯: f: 4 f for judgment, and the logical judgment circuit can be guaranteed]: Truth table (take three lamps as an example): One kind 6 Table one: Sensing unit 3 e Measuring unit 3 f Protection unit 4: Fault 1 ------ XX start X fault X start XX fault start Normal Normal Normal does not start the table

Sen Lili 3d © Sense Li 3 e Sensing K Yuan 3 f Protection m Yuan 4 Fault XX Turn off the lamp 2d's moving line 1d —XX Turn off the lamp 2e's moving line 1e _ ^ X Prayer Turn off the lamp 2 f, although the Ur line 1 f is normal, it will not start normally. M244703

_ Case No. 92212167 9. Creation instructions (7) The integrated circuit system of this creation is aimed at the large-scale development of lamps as indicators, which can achieve the following benefits: 1. Use one or more light source detectors for Detect components and implement protective measures. ~ &&; Because the greater the lamp current, the higher the brightness it emits, so the brightness of the light source detector is equivalent to the lamp current. By detecting the brightness detected by the light source, we can know the current operating performance of the lamp. ,,. Protection: The use of this light source detection element can be applied when the lamp is "road." 4. This-simple light source detector has the advantage of simplified circuit design. Single light source detection effect can not detect the current of the tube. Electricity requires a high-voltage element, but this simple knowledge of the open-circuit protector of the currently operated tube is only a change and modification of the scope of this creative implementation. 5, this simple one to achieve detection, etc. 6, for a circuit protection circuit. Protection function. 7, the entire light intensity in the case of voltage. But the above can be used to limit the original range of the equivalent range. It can have the characteristic of not consuming power. The backlight driver can detect the voltage but can detect the voltage. In order to know the current voltage state, the light source can be used to detect whether there is any abnormality in the lamp tube that does not need to be detected. The device can be implemented as a relatively simple process, which is a preferred embodiment. Should still be covered by this creative patent M244703

Brief description of the drawings [Simplified description of the drawings] f1 'is a schematic diagram of a conventional LCD backlight driving circuit protection device, which is shown in Fig. 2 for another purpose. A traditional LCD display backlight driver circuit protection setup. Figure 3 'is a schematic diagram of a single lamp in this creation. Figure 4 'is a schematic diagram of the two lamps in this creation. Figure 5 is a schematic diagram of multiple lamps in this creation. Fig. 6 'is a schematic diagram of the parallel connection of multiple lamps. Figure 7 'is a schematic diagram of the grounding of multiple lamps in this creation. FIG. 8 is a timing diagram of FIG. 3. FIG. 9 is a schematic diagram of another embodiment of the present creation. [Illustration of Symbols]

Drive line lamp2, 23, 21), 2ε, 2 (1,226 sensing units) 3, 3a, 3b, 3c, 3d protection units .... High voltage AC voltage ... 5 AC current ... .... The protection circuit is in a non-actuated state .... open circuit state ..... .... In the case of judgment ...

Page 12 M244703 _ Case No. 92212167_ Year Month Revision _ The diagram briefly illustrates the current detection circuit .............. 1, 1 7 Voltage detection circuit ..... ......... 1 8, 1 9 Voltage detection device ... 20 Current detection device ......... ....... 21 Protection circuit device ... 22 Transformer ... 24 ϋϋ p. 13

Claims (1)

M244703 1. A multi-lamp liquid crystal display back-well batch includes: one LCD display backlight drive line, two n sets of this device-Case No. 92212167 5. Application for patent scope: drive = lamp r generates high voltage electricity in the drive circuit ΞΞ Ϊ 线 Π line " backlit LCD display panel, characterized by ... and Lu Dianyi a sensing unit that senses the lamp light source; a security sensing unit connected to the output end of the sensing unit The output sensed signal 'makes the drive edge' and accepts an electrical output. The moving line stops generating high voltage. 2. As described in Item ^^ of the patent application scope, the light control protection device is added, and the sensing display is increased. The number of early-career heart lamps increases and 3. As described in item 丄 of the patent application scope: Moonlight control protection device, wherein the multiple sensing single displays • protection units. As early as the common connection of a single North 4, as many protection devices as described in item 1 of the scope of the patent application, where the drive circuit; JC as many as described in the scope of the patent application__ s. There should be a sensing kiosk on each protection sheet, and each sensing unit is connected to this L ^, as described in the first patent application scope, t-light control protection split, where, the Drive circuit; said display :: and the output end of the mother-lamp are all grounded, each lamp = connected to multiple lamps, where every sensing unit is connected to one corresponding to one sensing Page 14