CN201877107U - Luminance and contrast combined control circuit for OLED (organic light emitting diode) mini-type display - Google Patents
Luminance and contrast combined control circuit for OLED (organic light emitting diode) mini-type display Download PDFInfo
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- CN201877107U CN201877107U CN2010205514668U CN201020551466U CN201877107U CN 201877107 U CN201877107 U CN 201877107U CN 2010205514668 U CN2010205514668 U CN 2010205514668U CN 201020551466 U CN201020551466 U CN 201020551466U CN 201877107 U CN201877107 U CN 201877107U
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Abstract
The utility model discloses a luminance and contrast combined control circuit for an OLED (organic light emitting diode) mini-type display, which comprises an integrated voltage-stabilizing chip having double-way adjustable voltage output, a double-way digital potentiometer and a control system for controlling the digital potentiometer, wherein an input end of the integrated voltage-stabilizing chip is connected to the anode of an external input power supply; two output ends of the integrated voltage-stabilizing chip are respectively connected to a luminance and contrast control end of the OLED mini-type display; adjusting ends for controlling the double-way voltage output are respectively grounded through a resistor; the one-way digital potentiometer is serially connected between the two-way adjusting end for controlling the voltage output and a voltage output end respectively; and a control end of the digital potentiometer is connected to the control system. The luminance and contrast combined control circuit for the OLED mini-type display has the advantages that the intelligent control is realized, the demand that the control voltage of the OLED luminance and contrast cannot exceed a certain scope is met, the circuit integrated degree is high, and the stability is excellent.
Description
[technical field]
The utility model relates to a kind of helmet-mounted display system OLED miniscope brightness and contrast combined control circuit that is used for, and particularly relates to a kind of OLED miniscope brightness and contrast combined control circuit that is carried out intelligent control by Single Chip Microcomputer (SCM) system or microprocessor system.
[background technology]
In modern flat panel display systems, voltage control mode is usually adopted in brightness and contrast's control of display, the brightness and contrast changes along with the variation of control voltage, and for example the brightness and contrast of widely used eMagin OLED miniscope controls and adopted voltage control mode in helmet-mounted display system.
Regulating circuit adopts the direct current regulation circuit of Adjustable Output Voltage as shown in Figure 1 usually, and the voltage of the voltage output pin VOUT output of the integrated voltage stabilizing chip U1 among Fig. 1 and the resistance of adjustable resistance R1 are linear.Problems such as adjustable resistance R1 adopted mechanical knob formula potentiometer to finish in the past, in use generally had to regulate trouble, big with temperature drift in time, and reliability is not high, and is fragile.The brightness and contrast of eMaginOLED miniscope controls voltage certain range of adjustment, if surpassing this scope can shorten OLED serviceable life or cause the OLED permanent damage, adopt the accurately bound scope of regulating and controlling voltage of mechanical knob formula potentiometer, therefore in brightness and contrast's control circuit of OLED miniscope, be not suitable for using mechanical knob formula potentiometer.
[summary of the invention]
Technical problem to be solved in the utility model is to realize the control to OLED miniscope brightness and contrast, thereby propose a kind of two-way adjustable voltage output that has, and by Single Chip Microcomputer (SCM) system or the intelligent digital regulating circuit of controlling of microprocessor system.
The utility model solves the problems of the technologies described above by the following technical programs: a kind of OLED miniscope brightness and contrast combined control circuit, comprise an integrated voltage stabilizing chip with the output of two-way adjustable voltage, a two-way digital regulation resistance and the control system that digital regulation resistance is controlled, the positive pole of the outside input of described integrated voltage stabilizing chip input termination power supply, the output terminal and the OLED miniscope brilliance control end of integrated voltage stabilizing chip join, another output terminal and OLED miniscope contrast control end join, the adjustable side that integrated voltage stabilizing chip is used to control the adjustable side of first via voltage output and is used to control the output of the second road voltage is respectively by a resistance eutral grounding, be connected in series a way word potentiometer between the adjustable side that integrated voltage stabilizing chip is used to control the output of first via voltage and the first via voltage output end, be connected in series another way word potentiometer, the control end connected control system of digital regulation resistance between the adjustable side that is used to control the output of the second road voltage and the second road voltage output end.
Described control system is Single Chip Microcomputer (SCM) system or microprocessor system.
PC interface circuit in the described digital regulation resistance is connected to control system by the I2C bus, the PC interface circuit other end is connected respectively to first control register and second control register, described first control register and second control register are controlled the cursor slide of the two-way digital regulation resistance in the two-way digital regulation resistance respectively, the first via voltage output end of the high-end pin of the first via potentiometer of two-way digital regulation resistance and cursor slide and voltage stabilizing integrated chip joins, the first via potentiometer low side pin of two-way digital regulation resistance and the first via voltage output control terminal of voltage stabilizing integrated chip join, the high-end pin of No. the second potentiometer of two-way digital regulation resistance and the second road voltage output end of cursor slide and voltage stabilizing integrated chip join, and No. the second potentiometer low side pin of two-way digital regulation resistance and the second road voltage output control terminal of voltage stabilizing integrated chip join.
That described integrated voltage stabilizing chip uses is TPS71202, and that described two-way digital regulation resistance uses is AD5243.
The utility model has the advantages that: adopt control system that digital regulation resistance is controlled, realized the intelligent control of combined control circuit two output voltage, thereby satisfied the requirement that the OLED brightness and contrast must not exceed certain limit to control voltage.Owing to adopt integrated voltage stabilizing chip and two-way digital regulation resistance with the output of two-way adjustable voltage, simplified circuit, the integrated level height of the present utility model that makes, stability is good; And the degree of regulation height, good reliability.
[description of drawings]
Fig. 1 is the direct current regulation circuit structural representation of adjustable output voltage
Fig. 2 is the circuit theory diagrams according to the utility model embodiment.
[embodiment]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
As shown in Figure 2, comprise an integrated voltage stabilizing chip U1 according to the circuit of the utility model embodiment, that integrated in the present embodiment voltage stabilizing chip U1 uses is TPS71202, and this integrated voltage stabilizing chip U1 has the output of two-way adjustable voltage.The circuit of the utility model embodiment also comprises a digital regulation resistance U2, and the digital regulation resistance U2 that uses in the present embodiment is AD5243, and this digital regulation resistance U2 has two-way three terminal potential devices.The circuit of the utility model embodiment also comprises a control system U3, and this control system U3 is single-chip computer control system or microprocessor control system.
As shown in Figure 2, be connected in series the first via potentiometer RP1 of digital regulation resistance U2 between voltage input end (VIN) the welding system power supply of integrated voltage stabilizing chip U1, the adjustable side (FB1) of the first via output voltage of the integrated voltage stabilizing chip U1 adjustable side (FB1) by resistance R 1 ground connection first via output voltage and the first via voltage output end (VOUT1).The voltage of first via voltage output end (VOUT1) output of integrated voltage stabilizing chip U1 is given the brilliance control end of OLED miniscope.The adjustable side (FB2) of the second road output voltage of integrated voltage stabilizing chip U1 is by resistance R 2 ground connection, is connected in series No. the second potentiometer RP2 of digital regulation resistance U2 between the adjustable side of the second road output voltage (FB2) and the second road voltage output end (VOUT2).The voltage of the second road voltage output end (VOUT1) output of integrated voltage stabilizing chip U1 is given the contrast control end of OLED miniscope.
As shown in Figure 2, digital regulation resistance U2 can equivalence be two three terminal potential devices.The PC interface circuit is supported the I2C bus in the sheet, and control system disposes cursor slide control register 1 and cursor slide control register 2 by the I2C bus protocol, thus the position of control cursor slide W1 and cursor slide W2.The high-end pin A1 of first via potentiometer RP1 of digital regulation resistance U2 and the first via voltage output end OUT1 of cursor slide W1 and voltage stabilizing integrated chip U1 join, and the first via potentiometer RP1 low side pin B1 of digital regulation resistance U2 and the first via voltage output control terminal FB1 of voltage stabilizing integrated chip U1 join.The high-end pin A2 of No. the second potentiometer RP2 of digital regulation resistance U2 and the second road voltage output end OUT2 of cursor slide W2 and voltage stabilizing integrated chip U1 join, and No. the second potentiometer RP2 low side pin B2 of digital regulation resistance U2 and the second road voltage output control terminal FB1 of voltage stabilizing integrated chip U1 join.
When needs change brightness value, control system U3 comes the position of control figure potentiometer U2 first via potentiometer RP1 vernier by the I2C bus, thereby the W1 that changes and the resistance value at B1 two ends, then control the voltage of first via voltage output end (VOUT1) output of integrated voltage stabilizing chip U1, realized the OLED display brightness is controlled.
When needs change contrast value, control system U3 comes the position of the control figure potentiometer U2 No. the second potentiometer RP2 vernier by the I2C bus, thereby the W2 that changes and the resistance value at B2 two ends, then control the voltage of the second road voltage output end (VOUT2) output of integrated voltage stabilizing chip U1, realized the OLED display contrast is controlled.
The utility model is described with reference to current embodiment; but those skilled in the art will be appreciated that; above-mentioned embodiment only is used for illustrating the utility model; be not to be used for limiting protection domain of the present utility model; any within spirit of the present utility model and principle scope; any modification of being done, equivalence are replaced, are improved, and all should be included within the rights protection scope of the present utility model.
Claims (4)
1. OLED miniscope brightness and contrast combined control circuit, it is characterized in that: comprise an integrated voltage stabilizing chip with the output of two-way adjustable voltage, a two-way digital regulation resistance and the control system that digital regulation resistance is controlled, the positive pole of the outside input of described integrated voltage stabilizing chip input termination power supply, the output terminal and the OLED miniscope brilliance control end of integrated voltage stabilizing chip join, another output terminal and OLED miniscope contrast control end join, the adjustable side that integrated voltage stabilizing chip is used to control the adjustable side of first via voltage output and is used to control the output of the second road voltage is respectively by a resistance eutral grounding, be connected in series a way word potentiometer between the adjustable side that integrated voltage stabilizing chip is used to control the output of first via voltage and the first via voltage output end, be connected in series another way word potentiometer, the control end connected control system of digital regulation resistance between the adjustable side that is used to control the output of the second road voltage and the second road voltage output end.
2. a kind of OLED miniscope brightness and contrast combined control circuit as claimed in claim 1, it is characterized in that: described control system is Single Chip Microcomputer (SCM) system or microprocessor system.
3. a kind of OLED miniscope brightness and contrast combined control circuit as claimed in claim 1, it is characterized in that: the PC interface circuit in the described digital regulation resistance is connected to control system by the I2C bus, the PC interface circuit other end is connected respectively to first control register and second control register, described first control register and second control register are controlled the cursor slide of the two-way digital regulation resistance in the two-way digital regulation resistance respectively, the first via voltage output end of the high-end pin of the first via potentiometer of two-way digital regulation resistance and cursor slide and voltage stabilizing integrated chip joins, the first via potentiometer low side pin of two-way digital regulation resistance and the first via voltage output control terminal of voltage stabilizing integrated chip join, the high-end pin of No. the second potentiometer of two-way digital regulation resistance and the second road voltage output end of cursor slide and voltage stabilizing integrated chip join, and No. the second potentiometer low side pin of two-way digital regulation resistance and the second road voltage output control terminal of voltage stabilizing integrated chip join.
4. a kind of OLED miniscope brightness and contrast combined control circuit as claimed in claim 3 is characterized in that: that described integrated voltage stabilizing chip uses is TPS71202, and that described two-way digital regulation resistance uses is AD5243.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205514668U CN201877107U (en) | 2010-09-28 | 2010-09-28 | Luminance and contrast combined control circuit for OLED (organic light emitting diode) mini-type display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205514668U CN201877107U (en) | 2010-09-28 | 2010-09-28 | Luminance and contrast combined control circuit for OLED (organic light emitting diode) mini-type display |
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| Publication Number | Publication Date |
|---|---|
| CN201877107U true CN201877107U (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205514668U Expired - Lifetime CN201877107U (en) | 2010-09-28 | 2010-09-28 | Luminance and contrast combined control circuit for OLED (organic light emitting diode) mini-type display |
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| Country | Link |
|---|---|
| CN (1) | CN201877107U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540295A (en) * | 2015-01-06 | 2015-04-22 | 中航华东光电有限公司 | OLED brightness adjusting system based on FPGA and digital potentiometer |
| CN107424570A (en) * | 2017-08-11 | 2017-12-01 | 京东方科技集团股份有限公司 | Pixel unit circuit, image element circuit, driving method and display device |
-
2010
- 2010-09-28 CN CN2010205514668U patent/CN201877107U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540295A (en) * | 2015-01-06 | 2015-04-22 | 中航华东光电有限公司 | OLED brightness adjusting system based on FPGA and digital potentiometer |
| CN107424570A (en) * | 2017-08-11 | 2017-12-01 | 京东方科技集团股份有限公司 | Pixel unit circuit, image element circuit, driving method and display device |
| US10796641B2 (en) | 2017-08-11 | 2020-10-06 | Boe Technology Group Co., Ltd. | Pixel unit circuit, pixel circuit, driving method and display device |
| CN107424570B (en) * | 2017-08-11 | 2022-07-01 | 京东方科技集团股份有限公司 | Pixel unit circuit, pixel circuit, driving method and display device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
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| CX01 | Expiry of patent term |