CN202268150U - Digital voltage-regulating circuit and display device with same - Google Patents
Digital voltage-regulating circuit and display device with same Download PDFInfo
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- CN202268150U CN202268150U CN2011203774699U CN201120377469U CN202268150U CN 202268150 U CN202268150 U CN 202268150U CN 2011203774699 U CN2011203774699 U CN 2011203774699U CN 201120377469 U CN201120377469 U CN 201120377469U CN 202268150 U CN202268150 U CN 202268150U
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- reference voltage
- voltage source
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- control system
- control
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Abstract
The utility model relates to a digital voltage-regulating circuit which is used for regulating a voltage value of the brightness or contrast of an organic light emitting diode (OLED) display. The digital voltage-regulating circuit comprises a control circuit, a digital potentiometer and a control system, wherein the control circuit comprises a pull-up resistor, a parallel reference voltage source and a pull-down resistor; a cathode of the parallel reference voltage source is electrically connected with a power supply through the pull-up resistor and electrically connected to a brightness or contrast control end of the OLED display and the digital potentiometer, and an anode of the parallel reference voltage source is electrically grounded; a regulating end of the parallel reference voltage source is electrically grounded through the pull-down resistor and electrically connected to the digital potentiometer; and the digital potentiometer is electrically connected with the control system. By the digital voltage-regulating circuit, the influence of residual current can be eliminated. The utility model also relates to a display device with the digital voltage-regulating circuit.
Description
Technical field
The utility model relates to a kind of regulating circuit and has the display device of this regulating circuit, relates in particular to a kind of digital regulating circuit and has the display device of this digital regulating circuit.
Background technology
In modern times in the flat panel display systems; Voltage control mode is usually adopted in the brightness of display or contrast control; Brightness or contrast change along with the variation of control voltage; For example in helmet-mounted display system widely used eMagin company organic electric exciting light-emitting diode (voltage control mode has been adopted in its brightness or contrast control for Organic Light-Emitting Diode, OLED) miniscope.
The regulating circuit that voltage control mode adopts adopts the direct current regulation circuit of Adjustable Output Voltage as shown in Figure 1 usually, and this direct current regulation circuit 99 comprises integrated voltage stabilizing chip U11, adjustable resistance R11 and pull down resistor R12.The input end Vin of integrated voltage stabilizing chip U11 electrically connects the positive pole of outside input power supply 98; The output end vo ut of integrated voltage stabilizing chip U11 is via adjustable resistance R11 and the electrical ground connection of pull down resistor R12; The output end vo ut of integrated voltage stabilizing chip U11 is electrically connected at the brightness or the contrast control end 96 of OLED display 97, thereby the voltage of the output end vo ut of integrated voltage stabilizing chip U11 output is given the brightness or the contrast control end 96 of OLED display 97; The output control terminal Adj of integrated voltage stabilizing chip U11 is electrically connected between adjustable resistance R11 and the pull down resistor R12.The voltage of the output end vo ut output of integrated voltage stabilizing chip U11 and the resistance of adjustable resistance R11 are linear, therefore through the voltage of control output end Vout output, can realize the control to OLED display brightness or contrast.
Yet according to eMagin OLED miniscope user service manual, the display brightness control end has the situation of residual current output, and the residual current maximum can reach 10mA.Experiment proof is because the influence of residual current, when control end voltage is lower than 2V, can be forced and retracts 2V (the brilliance control voltage reference terminal is 1.4V ~ 2V).
The utility model content
In view of this, being necessary to provide a kind of can eliminate the digital regulating circuit of residual current influence and have the display device of this digital regulating circuit.
The utility model is achieved in that a kind of digital regulating circuit, and it is used to adjust the brightness of OLED display or the magnitude of voltage of contrast, and it comprises control circuit, digital regulation resistance and control system.This control circuit comprises pull-up resistor, parallelly connected reference voltage source and pull down resistor.The negative electrode of this parallel connection reference voltage source electrically connects via this pull-up resistor and power supply; And negative electrode that should the parallel connection reference voltage source also is electrically connected at brightness or contrast control end and this digital regulation resistance of this OLED display; The electrical ground connection of the anode of this parallel connection reference voltage source; The adjustable side of this parallel connection reference voltage source is via the electrical ground connection of this pull down resistor, and adjustable side that should the parallel connection reference voltage source also is electrically connected at this digital regulation resistance, and this digital regulation resistance also electrically connects with this control system.
Further; This digital regulation resistance comprises potentiometer, control register and computer interface; This potentiometer comprises high-end pin, the low side pin that links to each other with this high-end pin and the cursor slide between this high-end pin and this low side pin; This high-end pin all electrically connects with the negative electrode of this parallelly connected reference voltage source with this cursor slide; This low side pin electrically connects with the adjustable side of this parallelly connected reference voltage source, and this cursor slide also electrically connects with this control register, and this control register electrically connects via this computer interface and this control system.
Further, this control system is a kind of in single-chip microcomputer and the microprocessor, and this control system comprises clock line and serial data line, and this clock line and this serial data line are electrically connected between this computer interface and this control system.
Further, this digital regulation resistance is the AD5246 components and parts.
Further, this parallel connection reference voltage source is the TVL431 components and parts.
The utility model also provides a kind of display device; It comprises the OLED display; This display device also comprises the digital regulating circuit of the magnitude of voltage of the brightness that is used to adjust this OLED display or contrast; This digital regulating circuit comprises control circuit, digital regulation resistance and control system, and this control circuit comprises pull-up resistor, parallelly connected reference voltage source and pull down resistor.The negative electrode of this parallel connection reference voltage source electrically connects via this pull-up resistor and power supply; And negative electrode that should the parallel connection reference voltage source also is electrically connected at brightness or contrast control end and this digital regulation resistance of this OLED display; The electrical ground connection of the anode of this parallel connection reference voltage source; The adjustable side of this parallel connection reference voltage source is via the electrical ground connection of this pull down resistor, and adjustable side that should the parallel connection reference voltage source also is electrically connected at this digital regulation resistance, and this digital regulation resistance also electrically connects with this control system.
Further; This digital regulation resistance comprises potentiometer, control register and computer interface; This potentiometer comprises high-end pin, the low side pin that links to each other with this high-end pin and the cursor slide between this high-end pin and this low side pin; This high-end pin all electrically connects with the negative electrode of this parallelly connected reference voltage source with this cursor slide; This low side pin electrically connects with the adjustable side of this parallelly connected reference voltage source, and this cursor slide also electrically connects with this control register, and this control register electrically connects via this computer interface and this control system.
Further, this control system is a kind of in single-chip microcomputer and the microprocessor, and this control system comprises clock line and serial data line, and this clock line and this serial data line are electrically connected between this computer interface and this control system.
Further, this digital regulation resistance is the AD5246 components and parts.
Further, this parallel connection reference voltage source is the TVL431 components and parts.
Compared with prior art; Digital regulating circuit that the utility model provides and the display device with this digital regulating circuit, the parallelly connected reference voltage source through adopting the negative electrode Adjustable Output Voltage be as brilliance control voltage generator spare, thereby eliminated the influence of residual current; Thereby the brightness of OLED display or the problem that the contrast control end has residual current output influence control voltage have been solved; Realized intelligent control, thereby satisfied the brightness of OLED display or the requirement that contrast control voltage must not exceed certain limit, and its circuit level is high; Stability is good, has reduced the pcb board area.
Description of drawings
Fig. 1 forms synoptic diagram for existing structure with display device of traditional regulating circuit.
Fig. 2 forms synoptic diagram for the structure of the display device with digital regulating circuit that the utility model preferred embodiments provides.
Symbol description
|
|
100 |
|
The |
10、97 |
|
Digital regulating |
20 |
| Power supply | 30、98 |
|
Brightness or |
11、96 |
| Integrated voltage stabilizing chip |
|
| Control circuit | |
| 21 | |
| The parallel connection reference voltage source | U1 |
| Digital regulation resistance | U2 |
| Control system | U3 |
| Pull-up resistor | R0 |
| Pull down resistor | R1、R12 |
| Input end | Vin、 |
| Output terminal | Vout、 |
| Output control terminal | Adj |
| Potentiometer |
|
| Control register | |
| 27 | |
|
The |
28 |
| High-end pin | A |
| The low side pin | B |
| Cursor slide | W |
| Clock line | SCL |
| Serial data line | SDA |
|
Direct |
99 |
| Adjustable resistance | R11 |
。Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1, its structure for the display device 100 that the utility model preferred embodiments provides is formed synoptic diagram.Display device 100 comprises organic electric exciting light-emitting diode (Organic Light-Emitting Diode, OLED) the digital regulating circuit 20 and the power supply 30 of the magnitude of voltage of display 10, the brightness that is used to adjust OLED display 10 or contrast.OLED display 10 comprises brightness or contrast control end 11.
Digital regulating circuit 20 comprises control circuit 21, digital regulation resistance U2 and control system U3.In this embodiment, digital regulation resistance U2 is that example describes with chip AD5243, and control system U3 is that example describes with chip C8051.
Digital regulation resistance U2 comprises potentiometer RP, control register 27 and computing machine (PC) interface 28.Potentiometer RP comprises high-end pin A, the low side pin B that links to each other with high-end pin A and the cursor slide W between high-end pin A and low side pin B.High-end pin A all electrically connects with the negative electrode of parallelly connected reference voltage source U1 with cursor slide W; Low side pin B electrically connects with the adjustable side of parallelly connected reference voltage source U1; Cursor slide W also electrically connects with control register 27, and control register 27 electrically connects via PC interface and control system U3.
The PC interface is through clock line SCL and serial data line SDA and reach information communication as the single-chip microcomputer (control system also can be microprocessor in other embodiments) of control system U3.Single-chip microcomputer as control system U3 comes configuration control register 27 through I2C bus (being clock line SCL and serial data line SDA), thus the position of control cursor slide W.In brief, the PC interface of digital regulation resistance U2 is supported the I2C bus, comes configuration control register 27 as the single-chip microcomputer of control system U3 through the I2C bus, thus the position of control cursor slide W.
When needs change the brightness value of OLED display 10; Single-chip microcomputer as control system U3 sends numerical value through the I2C bus to the control register 27 of digital regulation resistance U2; Come the position of CONTROLLED POTENTIAL device RP vernier W; Thereby the W that changes and the resistance value at B two ends control the voltage that the negative electrode of parallelly connected reference voltage source U1 is exported then, have realized the control to 10 brightness of OLED display.
In sum; The display device that the utility model provides, the parallelly connected reference voltage source through adopting the negative electrode Adjustable Output Voltage be as brilliance control voltage generator spare, thereby eliminated the influence of residual current; Thereby the brilliance control end that has solved the OLED display has the problem of residual current output influence control voltage; Realized intelligent control, thus the requirement that the brightness of satisfying the OLED display must not exceed certain limit to control voltage, and its circuit level is high; Stability is good, has reduced the pcb board area.Be appreciated that control circuit that the utility model proposes also can be used for the contrast control of OLED display.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (10)
1. digital regulating circuit; It is used to adjust the brightness of OLED display or the magnitude of voltage of contrast; It is characterized in that it comprises control circuit, digital regulation resistance and control system, this control circuit comprises pull-up resistor, parallelly connected reference voltage source and pull down resistor; The negative electrode of this parallel connection reference voltage source electrically connects via this pull-up resistor and power supply; And negative electrode that should the parallel connection reference voltage source also is electrically connected at brightness or contrast control end and this digital regulation resistance of this OLED display, the electrical ground connection of the anode of this parallel connection reference voltage source, and the adjustable side of this parallel connection reference voltage source is via the electrical ground connection of this pull down resistor; And adjustable side that should the parallel connection reference voltage source also is electrically connected at this digital regulation resistance, and this digital regulation resistance also electrically connects with this control system.
2. digital regulating circuit as claimed in claim 1; It is characterized in that; This digital regulation resistance comprises potentiometer, control register and computer interface; This potentiometer comprises high-end pin, the low side pin that links to each other with this high-end pin and the cursor slide between this high-end pin and this low side pin, and this high-end pin all electrically connects with the negative electrode of this parallelly connected reference voltage source with this cursor slide, and this low side pin electrically connects with the adjustable side of this parallelly connected reference voltage source; This cursor slide also electrically connects with this control register, and this control register electrically connects via this computer interface and this control system.
3. digital regulating circuit as claimed in claim 2; It is characterized in that; This control system is a kind of in single-chip microcomputer and the microprocessor, and this control system comprises clock line and serial data line, and this clock line and this serial data line are electrically connected between this computer interface and this control system.
4. like any described digital regulating circuit in the claim 1 to 3, it is characterized in that this digital regulation resistance is the AD5246 components and parts.
5. like any described digital regulating circuit in the claim 1 to 3, it is characterized in that this parallel connection reference voltage source is the TVL431 components and parts.
6. display device; It comprises the OLED display; It is characterized in that; This display device also comprises the digital regulating circuit of the magnitude of voltage of the brightness that is used to adjust this OLED display or contrast, and this digital regulating circuit comprises control circuit, digital regulation resistance and control system, and this control circuit comprises pull-up resistor, parallelly connected reference voltage source and pull down resistor; The negative electrode of this parallel connection reference voltage source electrically connects via this pull-up resistor and power supply; And negative electrode that should the parallel connection reference voltage source also is electrically connected at brightness or contrast control end and this digital regulation resistance of this OLED display, the electrical ground connection of the anode of this parallel connection reference voltage source, and the adjustable side of this parallel connection reference voltage source is via the electrical ground connection of this pull down resistor; And adjustable side that should the parallel connection reference voltage source also is electrically connected at this digital regulation resistance, and this digital regulation resistance also electrically connects with this control system.
7. display device as claimed in claim 6; It is characterized in that; This digital regulation resistance comprises potentiometer, control register and computer interface; This potentiometer comprises high-end pin, the low side pin that links to each other with this high-end pin and the cursor slide between this high-end pin and this low side pin, and this high-end pin all electrically connects with the negative electrode of this parallelly connected reference voltage source with this cursor slide, and this low side pin electrically connects with the adjustable side of this parallelly connected reference voltage source; This cursor slide also electrically connects with this control register, and this control register electrically connects via this computer interface and this control system.
8. display device as claimed in claim 7; It is characterized in that; This control system is a kind of in single-chip microcomputer and the microprocessor, and this control system comprises clock line and serial data line, and this clock line and this serial data line are electrically connected between this computer interface and this control system.
9. like any described display device in the claim 6 to 8, it is characterized in that this digital regulation resistance is the AD5246 components and parts.
10. like any described display device in the claim 6 to 8, it is characterized in that this parallel connection reference voltage source is the TVL431 components and parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203774699U CN202268150U (en) | 2011-10-09 | 2011-10-09 | Digital voltage-regulating circuit and display device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203774699U CN202268150U (en) | 2011-10-09 | 2011-10-09 | Digital voltage-regulating circuit and display device with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202268150U true CN202268150U (en) | 2012-06-06 |
Family
ID=46158935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203774699U Expired - Lifetime CN202268150U (en) | 2011-10-09 | 2011-10-09 | Digital voltage-regulating circuit and display device with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202268150U (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 |
| CN109166515A (en) * | 2018-10-29 | 2019-01-08 | 惠科股份有限公司 | display device and adjusting method thereof |
-
2011
- 2011-10-09 CN CN2011203774699U patent/CN202268150U/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 |
| CN109166515A (en) * | 2018-10-29 | 2019-01-08 | 惠科股份有限公司 | display device and adjusting method thereof |
| WO2020087836A1 (en) * | 2018-10-29 | 2020-05-07 | 惠科股份有限公司 | Display device and adjustment method therefor |
| US11056072B2 (en) | 2018-10-29 | 2021-07-06 | HKC Corporation Limited | Display device and regulation method therefor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120606 |