TWI380270B - Backlight adjusting circuit - Google Patents

Description

1380270 —---- Year and month repair IX. Description of the invention: [Technical Field of the Invention] The present invention relates to a backlight adjustment circuit. [Prior Art] Because the liquid panel is low (four), thin and thin, it has been used in laptops, mobile phones, etc., and the LCD itself has no illuminating properties. It is not effective and needs to be liquid crystal. No backlight is provided on the panel. ··' Please - and refer to Figure 2, the schematic diagram of the front circuit of the figure, Figure 2 is the backlight adjustment shown in Figure i; schematic diagram of the exemplary brightness menu. The backlight adjustment circuit 10 U puts the controller 12, a luminance adjustment button 11 and a light-emitting diode = Tlttlngdl0de, LED) 14. The scaling controller 12 includes a processing circuit 12G, a pulse generating circuit m, and an integrating circuit 122. The zoom controller 12 is configured to adjust the light-emitting diode 14 and the brightness adjustment button η to the light-emitting diode 14 and send the brightness adjustment signal to the processing circuit 12A. =20 is used to output the brightness of the light-emitting diode 14 to the pulse generating circuit 121 every time the brightness adjustment button ^ is pressed, that is, after receiving a one-person brightness adjustment signal. The pulse generating circuit (2) side = can be the number of brightness levels of the brightness menu, on the other hand, each disk can be calculated on the other hand; = the brightness level of the light-emitting diode 14 after the degree adjusting button 11 - the ratio of the number of brightness levels, and Generate a certain pulse width and cycle ratio of 7 I38Q2? 〇mr^0^v year and month correction for q pulse ^»号" Take Figure 2 as an example, the brightness level of the brightness menu is ^, the light-emitting diode 14 When the luminance level is 6, the pulse generating circuit 121 generates a pulse signal having a pulse width and a period ratio of 3:5. The integrating circuit 122 η: counts the pulse signal after the luminance adjustment button u is pressed once and outputs the voltage to the light-emitting diode 14 ′ to adjust the luminance of the light-emitting diode 14 . And the two large households: the brightness of the light-emitting diode 14 is more high, and the brightness level of the brightness menu is set to be the first time the brightness adjustment button 11, the light-emitting diode 14 = equal, etc. A brightness level. However, the brightness of the brightness menu is small, "One or two: the brightness variation range between the adjacent brightness levels is changed. The brightness of the whole button 11 is changed to the brightness of the light-emitting diode, and it is necessary to press two times. And the waste of time:: tune two = the number of levels is 50, each connection _: = right the brightness of the first diode 14 r ΊΛ 按 press the _ person the brightness adjustment button 11, to determine a technical body 14 The luminance level can only be adjusted from 1 to the target, and the second is to be the first diode 14 (1). Therefore, the back-segment circuit 1 () ^ 47 times the brightness adjusts the high precision of the button source luminance. Dafan achieves backlighting in a short period of time. [Inventive content] In view of this, provide - high precision two == source luminance of the August light source, a backlight drive power 1380270 road, a coarse adjustment button, a fine tuning Jane is replacing and processing the circuit. The backlight driving circuit is used for driving the signal button and the fine button for generating a coarse adjustment:::. The coarse adjustment is based on the signal. The scaling circuit is based on the '* signal and A fine touch trigger signal generates a constant current = receive = coarse adjustment trigger signal and the fine adjustment Adding a dimming control signal. The dimming sees the modulation signal and superimposes it as a stack of signal integration to generate a coarse signal to control the brightness of the backlight, and the moving circuit 'and the coarse control signal separates the pulse width modulated signal stack. The second is transferred to the backlight driving circuit, and then the backlight is fine-tuned. ί辉产田相相 Compared with the prior art, the backlight adjustment power, the glow = button = a zoom circuit and a tone = do not handle the receiving thick Trigger signal and two: two (four) DC voltage and a pulse width modulation signal synthesis - superimposed "first control signal" The superimposed dimming control circuit is processed and outputted. After the first step, the source or the tuned signal is used to realize the large yoke adjustment or high-precision adjustment of the backlight, the number of adjustments, and the backlight adjustment accuracy is improved. [Embodiment] Referring to FIG. 3, the backlight adjustment circuit of the present invention is: -=:: backlight adjustment circuit 20 includes - coarse adjustment 22, backlight drive circuit (sab) 23, - dimming Signal processing circuit "light two" and one # light source 2 "the scaling circuit", side s Zhou You signal processing circuit 24, 兮 #古电峪24 the #先先电路, and the backlight

26 by - human electrical connection. The coarse adjustment button 21 and the fine adjustment button 22 are human-machine=mutual control, and the coarse adjustment button 21 is configured to send a coarse adjustment trigger signal to the scaling circuit 23, and the fine adjustment button 22 is configured to send a fine adjustment trigger signal to the The scaling circuit 23 processes the fine adjustment trigger signal and the coarse adjustment trigger signal to generate a fine control signal and a coarse control signal respectively, and combines the fine control signal and the coarse control signal into one The dimming control signal is superimposed, and the superimposed dimming control signal is output to the dimming signal processing circuit 24. The dimming signal processing circuit 24 processes the superimposed dimming control signal and outputs a coarse adjustment signal or a fine adjustment signal to the backlight driving circuit. The driving signal is driven by the coarse adjustment signal or the fine adjustment signal. Backlight = 26 to achieve a wide range or high precision change in backlight brightness level. The light source 26 is a light-emitting diode or a cold cathode fluorescent tube. The scaling circuit 23 includes a coarse adjustment processing circuit 23, a coarse adjustment control signal generation circuit 232, a fine adjustment processing circuit 233, a fine adjustment control signal generation circuit 234, and a modulation synthesis circuit 235. The modulation synthesis circuit 235 includes a controllable variable resistor (not shown). The coarse adjustment processing circuit 231 is configured to detect the coarse adjustment trigger signal sent by the silk button 21 . After the coarse adjustment processing circuit 231 detects the coarse adjustment trigger signal, the coarse control signal generating circuit 232 correspondingly generates a coarse control signal and outputs the modulated control signal to the modulated composite straight: coarse, and the signal control controls the controllable The sliding end of the variable resistor is used to detect the fine-tuning trigger signal sent by the fine-tuning button. After the fine adjustment processing circuit 233__-fines the trigger signal, the fine control signal = raw-fine control signal is output to the modulation synthesis...5. = Production 1380270 The date of the correction is only replaced. | The fine control signal is a pulse width modulation (PWM) signal. Each time the fine key 22 is pressed, the pulse width of the pulse width modulation signal increases accordingly. Since the scaling circuit 23 is an integrated circuit, the modulation combining circuit 235 superimposes the DC voltage division and the pulse width modulation signal into the superimposed dimming control signal, limited by the output port. The dimming signal processing circuit 24 includes a first integral smoothing circuit 241, a reverse circuit 242, a pulse width modulated signal separating circuit 243, a second integral smoothing circuit 244, an adding circuit 245, an amplifying circuit 246, and a The selector 247 and a count comparison circuit 248. The first integral smoothing circuit 241 and the pulse width modulation signal separating circuit 243 respectively receive the superimposed dimming control signals output by the modulation synthesizing circuit 235. The first integral smoothing circuit 241 integrates the superimposed dimming control signal, and outputs a first forward DC voltage, and the inverting circuit 242 inverts the first forward DC voltage to output a reverse DC voltage to the Addition circuit 245. The pulse width modulation signal separation circuit 243 separates the pulse width modulation signal from the superimposed dimming control signal and outputs the pulse width modulation signal to the second integration smoothing circuit 244. The second integrating smoothing circuit 244 integrates the pulse width modulated signal to output a second forward DC voltage to the adding circuit 245. The adding circuit 245 adds and reverses the reverse DC voltage and the second forward DC voltage, and is amplified by the amplifying circuit 246 and input to the first selection terminal 247 of the selector 247. The range adjusts the coarse adjustment signal of the backlight luminance. The second selection terminal 2472 of the selector 247 simultaneously receives the second forward DC voltage output by the second integration smoothing circuit 244 as a fine adjustment signal for adjusting the luminance of the backlight with high precision. 11

脉38Π97Π At the same time, the pulse width modulation signal separation circuit 243 outputs the pulse width modulation signal to the count comparison circuit 248. The count comparison circuit 248 includes a count comparator 2481, a memory 2482, and a clock signal generator 2483. The memory 2482 stores a pulse width value of an initial pulse width modulated signal. The clock signal generator 2843 generates a clock signal for calculating the pulse width value of the pulse width modulated signal received by the counter comparator 2481. The counting comparator 2481 compares the pulse width value of the initial pulse width modulation signal and the received pulse width modulation signal. If the two pulse width values are different, the counting comparator 2481 outputs a high potential to the selector 247. At the same time, the pulse width value of the pulse width modulation signal is stored in the memory 2 4 8 2 for the next pulse width comparison. The high potential control selector 247 selects to output the fine adjustment signal input by the second selection terminal 2472 to the backlight driving circuit 25, and the backlight driving circuit 25

Compared with the prior art, the backlight adjustment circuit 2〇23 and a dimming signal processing circuit 24, the processing circuit 231 and a fine network Lu search for a fine network Lu search for the emperor _

Reducing the number of adjustments of the button, 'and improving the backlight adjustment, that is, the circuit 20 includes a scaling circuit. The scaling circuit 23 includes a coarse adjustment 12 1380270 0 7 Accuracy 2 FIG. 4 'The backlight adjustment circuit of the present invention is the second one. Integral smoothing circuit: heart signal (four) electricity? 4 3, a second integral smoothing circuit 3 44, _ plus:: 348 today back ^ circuit correction, a choice 11 347 and a count comparison circuit # first adjustment circuit 30 and the backlight adjustment circuit 2 别 only lies in The first-integral smoothing circuit 341 superimposes the received control signal and outputs a -first forward direct current (four) to the adding circuit 345. The pulse width modulation signal separation circuit 343 separates the received superimposed dimming control signal from a pulse width modulation signal and outputs the signal to the second output DC voltage to the reverse circuit (4). The 342 reverses the second forward DC voltage and outputs a reverse DC voltage to the 2 addition circuit 345. The adding circuit 345 adds the reverse DC voltage to the first forward DC voltage and amplifies it via the amplifying circuit 346 and inputs the selector 347' as a coarse signal. Compared with the first embodiment, the adding circuit 345 adds the reverse DC voltage and the second forward voltage to a forward voltage, and is directly amplified by the amplifying circuit 345 and input to the selector 347. The selector 347 can be amplified and input via the amplifying circuit 345 without reversing. In summary, the present invention has indeed met the requirements of the invention patent, and Mai filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention. The scope of the present invention is not limited to the above embodiments, and is familiar to the present invention.

丨 - I 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit block diagram of a prior art backlight adjustment circuit. Fig. 2 is a view of the backlight adjustment circuit shown in Fig. 1. FIG. 3 is a block diagram of the backlight adjustment circuit of the present invention. FIG. 4 is a schematic diagram of the backlight adjustment circuit of the present invention. _ [Main component symbol description] Backlight adjustment circuit 20, 30 coarse adjustment button 21 fine adjustment button 22 zoom circuit 23 backlight drive circuit 25 backlight 26 coarse adjustment processing circuit 231 fine adjustment processing circuit 233 modulation synthesis circuit 235 pulse width modulation signal separation circuit second integral smoothing circuit coarse adjustment control signal generation circuit fine adjustment signal generation Circuit first integral smoothing circuit dimming signal processing circuit clock signal generator music consistent mode schematic diagram reverse circuit 242, 342 adding circuit 245 '345 amplifying circuit 246, 346 selector 247, 347 counting comparison circuit 248, 348 counting Comparator 2481 memory 2482 first selection terminal 2471 选择 a selection terminal 2472 243 , 343 244 , 344 232 234 241 ' 341 24 , 34 2483

Claims (1)

1380270 10. Patent application scope i A backlight adjustment circuit comprising: a backlight; a backlight driving circuit for driving the backlight; a coarse adjustment button and a fine adjustment button respectively for generating a coarse adjustment trigger signal a fine-tuning trigger signal; a scaling circuit that generates a DC voltage and a pulse width modulation signal according to the received coarse adjustment trigger signal and the fine adjustment trigger signal and superimposed as a superimposed dimming control signal; and a dimming signal a processing circuit that smoothly integrates the superimposed dimming control signal to generate a coarse adjustment signal to the backlight driving circuit, thereby coarsely adjusting the luminance of the monthly light source, and simultaneously, the dimming signal processing circuit separates the light from the superimposed dimming control signal a pulse width modulation signal, which is output as a fine-tuned signal to the S-hai backlight driving circuit, thereby finely adjusting the luminance of the backlight; wherein the dimming signal processing circuit includes a first integral smoothing circuit, a reverse circuit, and a Pulse width modulation signal separation circuit, a second integral smoothing circuit, an adding circuit, an amplifying circuit, a selector and a counting comparator The first integral smoothing circuit, the reverse circuit and the adding circuit are electrically connected in sequence, and the pulse width modulation signal separating circuit, the second integral smoothing circuit and the adding circuit are electrically connected in turn, and the counting comparing circuit respectively The selector circuit and the pulse width modulation signal knife are electrically connected to the circuit, and the adding circuit is electrically connected to the selection via the amplifying circuit, and the second integral smoothing circuit and the selector 15 f---- On the 8th of the month, the page is electrically connected. 2. The backlight adjustment circuit of claim 1, wherein the scaling circuit comprises a coarse control signal generating circuit, a fine control signal generating circuit, and the coarse control signal generating circuit and fine tuning respectively. The control signal generating circuit is electrically connected to one of the modulation and synthesis circuits. The coarse control signal generating circuit and the fine control signal generating circuit generate a coarse control signal and fine adjustment according to the coarse adjustment trigger signal and the fine adjustment trigger signal. The control signal, the coarse control signal controls the modulation synthesis circuit to generate the DC voltage, and the modulation synthesis circuit superimposes the DC voltage and the pulse width modulation signal as the superimposed dimming control signal. 3. The backlight adjustment circuit of claim 2, wherein the scaling circuit further comprises a coarse adjustment processing circuit and a fine adjustment processing circuit, the remote coarse adjustment processing circuit and the fine adjustment processing circuit respectively The control signal generating circuit and the fine control signal generating circuit are electrically connected to each other, wherein the coarse adjustment processing circuit is configured to detect the coarse adjustment trigger signal, and the coarse control signal generating circuit generates the sound according to the extracted result of the coarse adjustment processing circuit The fine adjustment control circuit is configured to detect the fine adjustment trigger signal, and the fine control signal generation circuit generates a fine adjustment control signal according to the detection result of the fine adjustment processing circuit. 4. The backlight adjustment circuit of claim 3, wherein: The Hai modulation synthesis circuit includes a controllable variable resistor, and the coarse control signal is controlled to control the sliding end of the controllable variable resistor to generate the DC component 1380270. The 'r input side 丨I voltage, the DC voltage division and The pulse width modulation signal is combined...^ control signal. The horse is controlled by Fengjia. 5. The backlight adjustment circuit described in claim i, wherein the selector includes a first & / m - and a second selection terminal, the amplification Electrically connected, the second integral smoothing circuit is electrically connected to the second selection end of the selector. 6. The backlight adjustment circuit according to claim 5 is in the middle, and the == circuit includes a count comparison. a memory, a memory and a clock signal generator, the memory and a clock number comparator are electrically connected, the food is eaten, and the time is found, and the time is stored in the first tenth of the body. The wide modulation signal 1_person 5 玄 & tens comparator compares with the received pulse = r pulse width value 'stains the new pulse width value. 7. The backlight adjustment as described in claim 6 In the circuit, in the basin, the clock signal generator is configured to generate a clock 汛諕, the clock signal 2...the pulse width value of the pulse width modulation signal received by the ten comparator, the statistic comparator and the memory according to the calculation result Stored pulse width value comparison output - high potential or low potential to the selection 8. If the application of the (4) surrounding 7th rhyme backlight adjustment circuit, wherein the & ten-digit slave output a high potential, the selector selects the second selection: the end of the input signal and output to The backlight driving circuit realizes the fine adjustment of the brightness of the backlight. 9. The circuit of the (4) circuit described in the seventh item of the application phase, wherein the 17 T 380270 is replaced by the replacement page. When the potential is low, the selector selects the round input signal of the first k-selective end and outputs the signal to the backlight driving circuit to achieve a coarse adjustment of the brightness of the backlight. 10. The backlight adjustment as described in the scope of the patent application The circuit, wherein the backlight is a light emitting diode or a cold cathode fluorescent lamp. 11. A backlight adjusting circuit, comprising: a backlight; a backlight driving circuit for driving the backlight; The coarse adjustment button and the fine adjustment button are respectively used to generate a signal and a fine adjustment trigger signal; - a scaling circuit for generating the DC voltage and the pulse width modulation according to the received rough signal and the fine adjustment trigger signal Signal Superimposed as a superimposed dimming control signal, and a Z-ray signal processing circuit, which superimposes the superimposed dimming_signal integral/month generating-roughing signal to the f-light driving circuit, and coarsely adjusts the luminance 'at the same time, The dimming signal processing circuit separates the pulse width modulation signal from the superimposed first control signal, and outputs the number to the backlight drive, and then fine-tunes the luminance of the backlight in the month 9 driving circuit; /, middle The dimming signal processing circuit comprises a first-community eight-Tja electric 峪 祜 first integrated smoothing electric circuit, a pulse width modulated signal separating electric one integral smoothing circuit, a ^ ^ 弗 - and a counting comparison circuit, 兮Bacterial connection, L, code + select the road as the electrical connection, 兮rr office% 4 Λ h This pulse see the modulation signal separation circuit, _第1380270 The backlight adjustment circuit of the second aspect of the invention, wherein the selector comprises a first selection end and a second selection end, the path is electrically connected to the first selection end, and the circuit and the circuit The second selection end of the selector is electrically connected.积刀千(7) Shenyue specializes in the backlight adjustment circuit described in item i 2, the second comparison circuit includes a -count comparator, -memory; the occurrence of the memory and a clock signal generator The electrical device is electrically connected, and the memory stores the pulse width value of the initial pulse width of 2, and in each of the counting comparators and the receiving pulse width, the Kawasaki pulse is widened, and the (4) is stored in The memory. The value of the ιγ application patent scope 帛13 of the backlight adjustment circuit, the 'in the basin of the clock signal test', the identification of the 4-tube bucket to use β to generate a clock signal, the number of clocks compared to the 11 reception pulse The pulse width of the wide modulated signal is two. The count comparator outputs a high potential or a low potential to the selector according to the calculation result and the memory stores a value of k. In the backlight adjustment circuit described in Patent No. 14, the impulse is compared with the output of a high potential, and the selector selects the 19 138.0 ί -f- ha correction for the second page " The input signal is output to the backlight drive circuit for each fine adjustment of the luminance of the backlight. According to the backlight adjustment circuit of claim 14, wherein the counter comparator outputs a low potential, the selector selects the input signal of the first selection terminal and outputs the input signal to the backlight driving circuit, # The coarse adjustment of the backlight brightness is now available. 17. The backlight adjustment circuit of claim n, wherein the backlight is a light emitting diode or a cold cathode fluorescent tube. The backlight adjustment circuit of claim 5, wherein the scaling circuit comprises a coarse control signal generating circuit, a fine control signal generating circuit, and the coarse control signal generating circuit and the fine The control signal generating circuit is electrically connected to the modulated human circuit, and the coarse control signal generating circuit and the fine control signal generating circuit generate a coarse control signal according to the coarse trigger signal and the fine trigger signal. Finely adjusting the control signal, the coarse control signal controls the modulation and synthesis circuit to generate the DC voltage, and the modulation and synthesis circuit superimposes the DC voltage and the pulse width modulation signal as the superimposed dimming control signal. The backlight adjustment circuit of claim 18, wherein the scaling circuit further comprises a coarse adjustment processing circuit and a fine adjustment processing circuit, wherein the coarse adjustment processing circuit and the fine adjustment processing circuit respectively The coarse control signal generating circuit and the fine control signal generating circuit are electrically connected, and the coarse adjusting processing circuit is configured to detect the coarse triggering signal. 20 Ι^Ι/Π 1380270 I year month 曰正热^号' The tuning control signal generating circuit generates the coarse adjustment control signal according to the detection result of the coarse adjustment processing circuit, wherein the fine adjustment processing circuit is configured to detect the fine adjustment trigger signal, and the fine control signal generating circuit performs processing according to the fine adjustment The result of the circuit produces a fine control signal. 20. The backlight adjustment circuit according to claim 19, wherein the modulation synthesis circuit comprises a controllable variable resistor, and the coarse control signal controls the sliding end of the controllable variable resistor. = system = flow divider and the pulse width modulation signal is synthesized into the superposition 21 13 802TOn, year, month and day correction replacement page VII, designated representative map: (1) The representative representative map of the case is: Figure (3) (2) Brief description of the components of the figure: backlight adjustment circuit 20 reverse circuit 242 coarse adjustment button 21 pulse width modulation signal separation circuit 243 fine adjustment button 22 coarse adjustment control signal generation circuit 232 scaling circuit 23 addition circuit 245 dimming signal processing circuit 24 amplification Circuit 246 Backlight Drive Circuit 25 Selector 247 Backlight 26 Count Comparison Circuit 248 Coarse Processing Circuit 231 Count Comparator 2481 Second Integral Smoothing Circuit 244 Memory 2482 Fine Processing Circuit 233 Clock Signal Generator 2843 Fine Tuning Signal Generation Circuit 234 First selection terminal 2471 modulation synthesis circuit 235 second selection terminal 2472 first integration smoothing circuit 241 When there is a chemical formula, please reveal the chemical formula that best shows the characteristics of the invention: