CN1390084A - Back-lighting driving and controlling device for hand-held electronic products - Google Patents
Back-lighting driving and controlling device for hand-held electronic products Download PDFInfo
- Publication number
- CN1390084A CN1390084A CN01115948A CN01115948A CN1390084A CN 1390084 A CN1390084 A CN 1390084A CN 01115948 A CN01115948 A CN 01115948A CN 01115948 A CN01115948 A CN 01115948A CN 1390084 A CN1390084 A CN 1390084A
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- hand
- electronic products
- held electronic
- backlight
- circuit
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- 230000010355 oscillation Effects 0.000 claims description 33
- 238000005286 illumination Methods 0.000 claims description 12
- 230000005669 field effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invented the device for driving and controlling the background light on the palm type electric product uses the voltage-boosting regulator circuit to control the high voltage oscilaltion drive circuit. The output of the voltage boosting regualtor circuit is controlled by the digital potetiometer to make the power supply provide the power for the high voltage oscilaltion drive circuit directly. Thus, the voltage-boosting regulator and the small size of the transformer are utilized to replace the traditional DC/DC voltage-boosting parts so as to reduce the volume of the palm type electric product, increase the efficiency of providing power and lower the cost of the product. Moreover, the brightness of the background light can be controlled through the software.
Description
Driving that a kind of hand-held electronic products is backlight and control device refer to a kind of device that adopts low cost to be used for the driving and the control thereof of hand-held electronic products backlight of display device especially.
Because hand-held electronic products (for example: palmtop PC, mobile phone etc.) has the restriction that is easy to carry, can be subjected to the environment place and the characteristics of using at any time, it has attracted increasing people's attention.Nearly all palmtop computer all adopts LCD as its device shown, and the brightness common and environment of the display effect of this LCD is closely related.In order under comparatively dim environment, to use hand-held electronic products, generally need install back lighting device additional for the LCD of hand-held electronic products, utilize this back lighting device, people just can both use hand-held electronic products veritably in any environment.
The most finished product backlight modules that adopt the specialized vendor to manufacture and design of existing hand-held electronic products, as shown in Figure 1 and Figure 2, the control integrated circuit 1 of the common employing special use of the driving of these backlight modules and control device or 1 ' and the powerful DC/DC device 2 that boosts, wherein, provide the driving power of backlight module by the powerful DC/DC of boosting device 2, special-purpose control integrated circuit 1 or 1 ' drives oscillating circuit and produces high drive backlight lamp tubes 4 by transformer 3; This driving and control device backlight has following shortcoming: because special-purpose control integrated circuit 1 or 1 ' costs an arm and a leg, pin is more, and need be by powerful DC/DC device 2 power supplies of boosting, special-purpose control integrated circuit 1 or 1 ' makes the cost of hand-held electronic products product higher with the powerful DC/DC of boosting device 2, volume is bigger so adopt; Because power supply need could be powered through the DC/DC device 2 that boosts and be given backlight circuit, therefore can reduce the efficient of power supply.
Because the backlight drive of existing hand-held electronic products and the deficiency of control device, main purpose of the present invention is to provide driving backlight of a kind of hand-held electronic products and control device, the drive circuit of this device adopts the adjuster control oscillation circuit of boosting to produce required high pressure, and, reduce the cost of hand-held electronic products product by the electric current of digital regulation resistance adjustment oscillating circuit.
Another object of the present invention is to provide driving backlight of a kind of hand-held electronic products and control device, the digital regulation resistance that is used to adjust oscillating circuit can be realized the adjustment to backlight illumination by software control.
Another purpose of the present invention is to provide driving backlight of a kind of hand-held electronic products and control device, utilizes the transformer of boost adjuster and small size to substitute traditional DC/DC device that boosts, and reduces the volume of this device, improves the efficient of its power supply.
The objective of the invention is to realize by the following technical solutions:
Driving that a kind of hand-held electronic products is backlight and control device, the high-voltage oscillation drive circuit of being made up of power tube and transformer connect and drive backlight lamp tube, and power supply circuits are connected with this high-voltage oscillation drive circuit and to this high-voltage oscillation drive circuitry; The adjustment circuit that boosts is connected with the high-voltage oscillation drive circuit and controls this high-voltage oscillation drive circuit, and a potentiometer connects and control the output of this adjustment circuit that boosts.
The described adjustment circuit that boosts is made up of boost adjuster and power tube; This regulator output of boosting is connected to the control input end of this power tube, this power tube and the two ends that are connected to power supply after the high-voltage oscillation drive circuit is connected; The input control end of this adjuster that boosts is connected with the backlight switch control signal of hand-held electronic products, and is subjected to this signal controlling.
Described potentiometer is connected to the voltage of adjusting circuit that boosts and adjusts input; This potentiometer is a digital regulation resistance, and this digital regulation resistance is adjusted signal with the backlight illumination of hand-held electronic products and is connected, and the resistance value of its output is adjusted signal controlling by the backlight illumination of hand-held electronic products.
The backlight illumination of described hand-held electronic products is adjusted the corresponding software control of signal by this hand-held electronic products.
Described power supply circuits directly are power supply.
Utilization of the present invention is boosted and is adjusted circuit control high-voltage oscillation drive circuit, control the output of this adjustment circuit that boosts by digital regulation resistance, make power supply directly to the high-voltage oscillation drive circuitry, thereby realized utilizing the transformer of boost adjuster and small size to substitute traditional DC/DC device that boosts, reduced the volume of hand-held electronic products, improve the efficient of power supply, reduced the manufacturing cost of hand-held electronic products; And can be by software control brightness backlight.
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment.
Fig. 1 is a backlight drive of prior art and the schematic block circuit diagram of control device.
Fig. 2 is another backlight drive of prior art and the schematic block circuit diagram of control device.
Fig. 3 is the schematic block circuit diagram of backlight drive of the present invention and control device.
Fig. 4 is the circuit theory diagrams of the present invention's one specific embodiment.
As shown in Figure 3, driving that hand-held electronic products of the present invention is backlight and control device, be provided with the high-voltage oscillation drive circuit of forming by two power tubes and transformer 3, this high-voltage oscillation drive circuit connects and also drives backlight lamp tube 4, and power supply V_BATTERY directly is connected with this high-voltage oscillation drive circuit and to this high-voltage oscillation drive circuitry.
Adjusting circuit by boosting of forming of boost adjuster 5 and power tube Q is connected with the high-voltage oscillation drive circuit and controls this high-voltage oscillation drive circuit, this output that boosts adjuster 5 is connected to the control input end of this power tube Q, this power tube Q and the two ends that are connected to power supply V_BATTERY after the high-voltage oscillation drive circuit is connected; The input control end LIGHT_ON of this adjuster 5 that boosts is connected with the backlight switch control signal of hand-held electronic products, and is subjected to this signal controlling.
Digital regulation resistance 6 connects and controls the output of this adjustment circuit that boosts, and this digital regulation resistance 6 is connected to the voltage of the adjuster 6 that boosts and adjusts input FB; This digital regulation resistance 5 is adjusted signal LIGHT_D/U, LIGHT_INC with the backlight illumination of hand-held electronic products and is connected, and the resistance value of its output is adjusted signal LIGHT_D/U, LIGHT_INC control by the backlight illumination of hand-held electronic products; This backlight illumination is adjusted signal LIGHT_D/U, the LIGHT_INC corresponding software control by this hand-held electronic products.
Owing to adopted above-mentioned circuit, the DC/DC circuit that boosts in the prior art between power supply and high-voltage oscillation drive circuit just can be omitted, transformer 3 recited above can be the oscillation transformer of a small size, has therefore reduced the loss of DC/DC circuit, has improved the efficient of power supply.
As shown in Figure 4, one embodiment of the invention are palmtop PC driving backlight and control device, this device is provided with the high-voltage oscillation drive circuit of being made up of power tube Q2, Q4 and oscillation transformer T1, wherein, the control end of power tube Q2, Q4 is connected on the power supply V_BATTERY by resistance R 1, R2 respectively, the elementary oscillation circuit that connects and composes of power tube Q2, Q4 and oscillation transformer T1, the elementary common tap of this oscillation transformer T1 also is directly connected on the power supply V_BATTERY; By field effect transistor Q1, a boost adjuster U1 and a high performance N channel power field effect transistor Q3 connects to form the adjustment circuit that boosts, wherein, the adjuster U1 that boosts connects this high performance N channel power field effect transistor Q3 of control by its output control pin 5, the power tube Q2 of this N channel power field effect transistor Q3 and high-voltage oscillation drive circuit, Q4 connects, control this power tube Q2, the vibration of the elementary oscillation circuit that connects and composes of Q4 and oscillation transformer T1, be connected to the input control end LIGHT_ON of field effect transistor Q1 from the backlight control signal of palmtop PC governor circuit, when this input control end LIGHT_ON is high level, power supply VCC to the adjuster U1 power supply of boosting, makes its work by field effect transistor Q1.
The output of adjusting circuit is connected with a digital regulation resistance U2 boosting, this digital regulation resistance U2 adjusts signal LIGHT_D/U, LIGHT_INC with the backlight illumination of palmtop PC and is connected, this backlight illumination is adjusted signal LIGHT_D/U, LIGHT_INC and is controlled by the software of palmtop PC, the change of this signal changes the magnitude of voltage of digital regulation resistance U2 output, the boost output of adjuster U1 of the voltage signal adjustment of this digital regulation resistance U2 output, and then to the adjustment of high-voltage oscillation drive circuit loop current, thereby realize adjusting the brightness of backlight lamp tube 4.
Claims (6)
1, a kind of hand-held electronic products driving and control device backlight, the high-voltage oscillation drive circuit of being made up of power tube and transformer connect and drive backlight lamp tube, and power supply circuits are connected with this high-voltage oscillation drive circuit and to this high-voltage oscillation drive circuitry; It is characterized in that: the adjustment circuit that boosts is connected with the high-voltage oscillation drive circuit and controls this high-voltage oscillation drive circuit, and a potentiometer connects and control the output of this adjustment circuit that boosts.
2, hand-held electronic products as claimed in claim 1 driving and control device backlight is characterized in that: the described adjustment circuit that boosts is made up of boost adjuster and power tube; This regulator output of boosting is connected to the control input end of this power tube, this power tube and the two ends that are connected to power supply after the high-voltage oscillation drive circuit is connected; The input control end of this adjuster that boosts is connected with the backlight switch control signal of hand-held electronic products, and is subjected to this signal controlling.
3, hand-held electronic products as claimed in claim 1 driving and control device backlight is characterized in that: described potentiometer is connected to the voltage of adjusting circuit that boosts and adjusts input.
4, as claim 1 or 3 described hand-held electronic products driving and control device backlight, it is characterized in that: described potentiometer is a digital regulation resistance, this digital regulation resistance is adjusted signal with the backlight illumination of hand-held electronic products and is connected, and the resistance value of its output is adjusted signal controlling by the backlight illumination of hand-held electronic products.
5, hand-held electronic products as claimed in claim 4 driving and control device backlight is characterized in that: the backlight illumination of described hand-held electronic products is adjusted the corresponding software control of signal by this hand-held electronic products.
6, hand-held electronic products as claimed in claim 1 driving and control device backlight is characterized in that: described power supply circuits directly are power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011159480A CN1205844C (en) | 2001-06-06 | 2001-06-06 | Back-lighting driving and controlling device for hand-held electronic products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011159480A CN1205844C (en) | 2001-06-06 | 2001-06-06 | Back-lighting driving and controlling device for hand-held electronic products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1390084A true CN1390084A (en) | 2003-01-08 |
| CN1205844C CN1205844C (en) | 2005-06-08 |
Family
ID=4662295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011159480A Expired - Lifetime CN1205844C (en) | 2001-06-06 | 2001-06-06 | Back-lighting driving and controlling device for hand-held electronic products |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1205844C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877688A (en) * | 2017-05-12 | 2018-11-23 | 京东方科技集团股份有限公司 | Backlight brightness control method and device |
| CN102044201B (en) * | 2009-10-14 | 2020-05-15 | 三竹资讯股份有限公司 | Apparatus and method for constantly bright display of mobile device screen |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100524429C (en) * | 2005-12-19 | 2009-08-05 | 新巨企业股份有限公司 | Driving method of backlight module |
-
2001
- 2001-06-06 CN CNB011159480A patent/CN1205844C/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102044201B (en) * | 2009-10-14 | 2020-05-15 | 三竹资讯股份有限公司 | Apparatus and method for constantly bright display of mobile device screen |
| CN108877688A (en) * | 2017-05-12 | 2018-11-23 | 京东方科技集团股份有限公司 | Backlight brightness control method and device |
| US10706791B2 (en) | 2017-05-12 | 2020-07-07 | Boe Technology Group Co., Ltd. | Backlight brightness control method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1205844C (en) | 2005-06-08 |
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Owner name: LIANXIANG (BEIJING) CO. LTD.; HUMANTEC INDUSTRIAL Free format text: FORMER OWNER: LIANXIANG (BEIJING) CO. LTD. Effective date: 20080704 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080704 Address after: No. 6, Pioneer Road, Beijing, Haidian District: 100085 Co-patentee after: Lenovo Mobile Communication Technology Ltd. Patentee after: Lenovo (Beijing) Co., Ltd. Address before: No. 6, Pioneer Road, Haidian District information industry base, Beijing, China: 100085 Patentee before: Lenovo (Beijing) Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20050608 |
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| CX01 | Expiry of patent term |