CN1635403A - Method and apparatus for eliminating LCD frame flicker phenomenon - Google Patents
Method and apparatus for eliminating LCD frame flicker phenomenon Download PDFInfo
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- CN1635403A CN1635403A CN 200310113077 CN200310113077A CN1635403A CN 1635403 A CN1635403 A CN 1635403A CN 200310113077 CN200310113077 CN 200310113077 CN 200310113077 A CN200310113077 A CN 200310113077A CN 1635403 A CN1635403 A CN 1635403A
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Abstract
This invention discloses a method to remove the LCD flash phenomenon, which comprises the following steps: acquiring the display current environment condition information according to certain frequency; acquiring base data according to environment information and conditions and base data; forming proper direct current level according to the base data; forming the VCOM signals by mixing with COM signals of the liquid crystal display and outputting them to the display. The invention also provides the device, which comprises the following parts: outer environment sensing unit; processor to receive outer environment condition information and output control signals; memory unit to store environment condition and base data relationship and the VCOM signal generation unit.
Description
Technical field
The present invention relates to the LCD picture regulation technology, be meant a kind of method and apparatus of eliminating the LCD picture scintillation especially.
Background technology
Flicker (Flicker) phenomenon appears in the picture of Thin Film Transistor-LCD LCD such as (TFT_LCD) sometimes, and this is because the picture displayed GTG has slight change when each frame update, so allow human eye experience picture in flicker.The Flicker phenomenon is closely related with conditions such as the brightness of display environment of living in, temperature, humidity, has eliminated the LCD of Flicker phenomenon under a certain environmental baseline, may occur the Flicker phenomenon once more if be placed on to use under another environmental baseline.
Because the appearance of Flicker phenomenon can have a strong impact on the display effect of LCD, therefore in order to eliminate the Flicker phenomenon, guarantee the display effect of TFT_LCD, a VCOM input signal is arranged in TFT_LCD, can reach the purpose of eliminating the Flicker phenomenon by adjusting to the VCOM signal.The circuit structure of the present adjusting VCOM signal that adopts is referring to shown in Figure 1.A variable potentiometer 101 is set on the VCOM of TFT_LCD signal input circuit, by regulating the variable resistor R on the variable potentiometer 101, produce different DC level and mix from COM end input and through the reverse COM signal of reverser 102, thereby modulate different VCOM signals, export TFT_LCD to from the VCOM end.Wherein, the COM signal is the output fixing signal that TFT_LCD produces, and by the COM signal is mixed with certain DC level, can modulate the VCOM signal that needs and be back to TFT_LCD, reaches the effect of eliminating the Flicker phenomenon.
The shortcoming of this scheme at first is the varying environment condition effect, because adjustment process, generally all when dispatching from the factory, TFT_LCD once carries out, environmental baseline when environmental baseline at that time and user use can not be on all four, and the user also might be in different environmental baselines use equipment, as: outdoor and indoor, daytime and night are so just can not guarantee that also the user in use the Flicker phenomenon can not occur; Next is an artificial factor, the prior art scheme is to adopt manual shift, judges the quality of adjusting by visual inspection, and this just can occur producing because observe inaccurate the deviation of regulating inevitably; After the Flicker phenomenon occurring in user's use once more, user oneself regulates TFT_LCD if desired, then regulates very inconvenient.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of method of eliminating the LCD picture scintillation, avoids environmental baseline, artificial factor, does not need user intervention and eliminates the LCD picture scintillation easily.
A kind of method of eliminating the LCD picture scintillation, the COM signal of the fixing output of LCD is modulated into the VCOM signal that the flicker of control LCD picture is eliminated, and the VCOM signal input part of the input of the signal after will modulating LCD, may further comprise the steps:
A) obtain the current environmental baseline information of living in of LCD;
B) the environmental baseline information that obtains according to step a) by the environmental baseline that sets in advance and the corresponding relation of benchmark numerical value, is obtained the benchmark numerical value of this environmental baseline correspondence;
C) the benchmark numerical value that obtains according to step b) generates the DC level that is used to regulate the VCOM signal;
D) DC level that step c) generated is mixed generation VCOM signal with the COM signal of the fixing output of LCD, export the VCOM signal input part of LCD to.
The described step a) of this method specifically comprises: the external environment sensing unit is set, and the external environment sensing unit is surveyed the current environmental baseline of living in of LCD, and result of detection is exported as environmental baseline information.
The described environmental baseline information of this method comprises: brightness, temperature and humidity information.
The described step c) of this method specifically comprises: the benchmark numerical value that step b) is obtained produces pwm signal output as input by width modulation, and the Bob that accounts for according to output pwm signal generates the DC level that is used to regulate the VCOM signal again.
The described step c) of this method specifically comprises: the benchmark numerical value that step b) is obtained generates the DC level that is used to regulate the VCOM signal as input by digital regulation resistance.
Describedly after the described step d) of this method further comprise: at interval one specific period, repeated execution of steps is a) to step d).
Further purpose of the present invention provides a kind of device of eliminating the LCD picture scintillation, not influenced by environmental baseline and human factor, eliminates the LCD picture scintillation automatically.
A kind of device of eliminating the LCD picture scintillation, comprise: be used to obtain external environmental condition information the external environment sensing unit, be used to the processor that receives external environmental condition information and export corresponding control signal, the storage unit that is used to preserve environmental baseline and benchmark numerical value corresponding relation, and be used for the VCOM signal generation unit that the receiving processor control signal generates the VCOM signal;
Wherein, described processor receives the output signal of external environment sensing unit and storage unit, generate control signal and export VCOM signal generation unit to, the control signal of VCOM signal generation unit receiving processor output and the COM signal of exporting from LCD generate the VCOM signal input part that the VCOM signal exports LCD to.
This installs in the described VCOM signal generation unit and includes low-pass filter and voltage follower; After entering VCOM signal generation unit from the control signal of described processor output, generate DC level through low-pass filter and voltage follower successively, mix with the COM signal of exporting from LCD at the voltage follower output terminal, generate the VCOM signal input part that the VCOM signal exports LCD to.
This installs described processor is the processor that has the PWM unit, and the control signal of processor output is a pwm signal.
This installs in the described VCOM signal generation unit and includes digital regulation resistance; After entering VCOM signal generation unit from the control signal of described processor output, generate DC level through digital regulation resistance, mixes with COM signal from LCD output, generation VCOM signal exports the VCOM signal input part of LCD to.
This installs described external environment sensing unit and comprises: luminance sensor, temperature sensor and humidity sensor.
This installs described storage unit is flash memory.
From above as can be seen, the method and apparatus of elimination LCD picture scintillation provided by the invention, by automatic detection external environmental condition, the environmental baseline that utilization sets in advance and the corresponding relation of benchmark numerical value obtain suitable VCOM signal and come drive TFT _ LCD display.Whole process is transparent to the user, does not need user's intervention fully, can eliminate the LCD picture scintillation, and has avoided environmental baseline, artificial factor, guarantees the display effect that the user uses under various conditions.
Description of drawings
Fig. 1 is a prior art scenario-frame synoptic diagram;
Fig. 2 is the inventive method schematic flow sheet;
Fig. 3 eliminates the structured flowchart of LCD picture scintillation device for the present invention;
Fig. 4 is a VCOM signal generation unit structured flowchart in a preferred embodiment of the present invention;
Fig. 5 is the circuit theory diagrams of VCOM signal generation unit in a preferred embodiment of the present invention;
Fig. 6 eliminates signal flow in the work of LCD picture scintillation device to synoptic diagram for the present invention;
Fig. 7 is the circuit theory diagrams of VCOM signal generation unit in another preferred embodiment of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The present invention program obtains the current external environmental condition information of living in of LCD by adopting the external environment sensing unit by certain frequency, and according to the suitable DC level of environmental baseline information generation that obtains, the COM signal of DC level and LCD output is mixed into the VCOM signal, export LCD to, thereby eliminate the LCD picture scintillation.
In order to realize such scheme, can set in advance environmental baseline and benchmark numerical value corresponding tables among the present invention, environmental baseline information different in corresponding tables are to having different benchmark numerical value in order to the different level value of regulation, so, can in environmental baseline and benchmark numerical value corresponding tables, search corresponding benchmark numerical value according to the environmental baseline information that obtains, generate corresponding DC level according to this benchmark numerical value.
The method flow of preferred embodiment of the present invention, referring to shown in Figure 2:
Step 201 is obtained the environmental baseline information of the brightness of living in of current LCD, temperature and humidity by the external environment sensing unit.
Step 202 is searched corresponding benchmark numerical value according to the environmental baseline information that obtains in environmental baseline and benchmark numerical value corresponding tables.
Step 203 generates corresponding DC level according to this benchmark numerical value.
Step 204 is mixed into the VCOM signal with the level of generation and the COM signal of LCD output, exports LCD to.
In addition, in order better changes in environmental conditions to be detected also and can further to comprise:
Step 205 is returned step 201 behind the certain interval of time.
Wherein, be the environment detection frequency interval time, can look actual needs and stipulate, also can be set to zero interval time, promptly detects external environment in real time and change.
In order to realize process described above, the structured flowchart of elimination LCD picture scintillation device provided by the invention is referring to shown in Figure 3.This device comprises: external environment sensing unit 301, processor 302, storage unit 303, VCOM signal generation unit 304.Wherein, external environment sensing unit 301 is used to survey environmental baseline information such as brightness, temperature, humidity, storage unit 303 is used to preserve environmental baseline and benchmark numerical value corresponding tables, processor 302 is used for that environmental baseline information is changed into control signal and exports VCOM signal generation unit 304 to, modulates suitable VCOM signal and exports TFT_LCD 305 to and the effect of VCOM signal generation unit 304 is COM signals according to the control signal of processor 302 and TFT_LCD 305.
External environment sensing unit 301 is that concrete numerical value exports processor 302 to environmental baseline information quantizations such as the brightness surveyed, temperature, humidity during practical application; Processor 302 is according to the input of the external environment sensing unit 301 that receives, inquiry environmental baseline and benchmark numerical value corresponding tables in storage unit 303, obtain the benchmark numerical value of this environmental information correspondence, this benchmark numerical value is converted to corresponding control signal exports VCOM signal generation unit 304 to; VCOM signal generation unit 304 produces a dc level signal according to the control signal of input, the synthetic VCOM signal of COM signal with this level signal and TFT_LCD 305 outputs inputs to TFT_LCD 305, come drive TFT _ LCD 305, thereby can eliminate the Flicker phenomenon fully.
Lifting an object lesson below illustrates:
Extraneous environment induction unit is made up of general luminance sensor, temperature sensor and humidity sensor in the present embodiment, storage unit adopts general flash memory (Flash) chip, environmental baseline of in storage unit, preserving and benchmark numerical value corresponding tables, ginseng is shown in Table 1:
| Environmental baseline | Benchmark numerical value | ||
| Brightness (cd/m) | Temperature (℃) | Humidity (%) | |
| ????800 | ????20 | ????40 | ????20 |
| ????500 | ????32 | ????60 | ????13 |
| ????600 | ????31 | ????70 | ????15 |
Table 1
When the brightness of external environment be 800cd/m, 20 ℃ of temperature, when humidity is 40%, corresponding benchmark numerical value is 20; When external environment brightness be 500cd/m, 32 ℃ of temperature, when humidity is 60%, corresponding benchmark numerical value is 13; When external environment brightness be 600cd/m, 31 ℃ of temperature, when humidity is 70%, corresponding benchmark numerical value is 15.
Processor in the present embodiment is selected for use has pulse bandwidth modulating unit (PWM, Pulse-WidthModulation Unit) CPU, as intel Xscale CPU, the exportable pwm pulse signal of this class processor, and can control the Bob that accounts for of pwm pulse signal according to the benchmark numerical value of input, produce the pulse signal of different in width.Therefore environmental baseline is exactly to be used for controlling the corresponding input value that CPU exports the pwm pulse signal width with benchmark numerical value in the benchmark numerical value corresponding tables here, and it can think to generate the needed input value of suitable direct current level.
Based on this class processor, the structured flowchart of the VCOM signal generation unit of present embodiment is referring to shown in Figure 4.Mainly comprise in the VCOM signal generation unit: low-pass filter 401 and voltage follower 402.By the pwm signal of processor input through low-pass filter filtering after voltage follower is converted to dc level signal, and mix with the COM signal of importing from the COM end at the output terminal of voltage follower, produce corresponding VCOM signal and export TFT_LCD to.
The realization circuit structure of this VCOM signal generation unit is referring to shown in Figure 5.Comprise: the low-pass filter of forming by resistance R 40 and capacitor C 34 401, and the voltage follower of forming by amplifier U12 402.Wherein, the VCOM_ADJ end is the pwm signal input end, and the COM end is the input end of COM signal, and the VCOM end is the VCOM signal output part.The pwm signal with certain pulse width of processor output mixes with the COM signal of importing from the COM end behind low-pass filter 401 and voltage follower 402 by the input of VCOM_ADJ end, exports TFT_LCD thereby modulate the VCOM signal to from the VCOM end.
Present embodiment is eliminated the transmission course of signal in the LCD picture scintillation device course of work, can be referring to shown in Figure 6, suppose that current external environmental condition is: brightness 800cd/m, 20 ℃ of temperature, humidity is 40%, it is converted into digital form and is sent to processor 302 external environment sensing unit 301 with result of that probe, after processor 302 receives this environmental baseline information, the pairing benchmark numerical value of this condition of inquiry is 20 in the environmental baseline of storer 303 and benchmark numerical value corresponding tables, then utilize this benchmark numerical value to regulate the pulse width of the pwm signal of output, pwm signal input VCOM signal generation unit 304, through low-pass filter filtering, entering voltage follower handles, produce corresponding DC level, DC level is sent to TFT_LCD 305 at the VCOM signal that the COM signal hybrid modulation of the output terminal of voltage follower and input goes out to need.
Based on above-mentioned thought, elimination LCD picture scintillation device of the present invention can also adopt another kind of implementation, referring to shown in Figure 7.The VCOM signal generation unit of this scheme mainly comprises a digital regulation resistance of being made up of MAX5161MEZT U40 chip, the processor that this scheme adopted can be the processor of common output digital controlled signal, processor will inquire about benchmark numerical value that environmental baseline and benchmark numerical value corresponding tables obtained with the form of digital signal from LIGHT_D/U, the LIGHT_INC end inputs to VCOM signal generation unit, after digital regulation resistance changes into corresponding DC level, mix, obtain holding the VCOM signal input part that exports TFT_LCD to from VCOM behind the VCOM signal with the COM signal of importing from the COM end.
Processor and storer in processor in apparatus of the present invention and storage unit etc. also can directly be utilized with LCD is connected the computer equipment.
The method and apparatus of elimination LCD picture scintillation of the present invention is applicable to the LCD that TFT_LCD etc. can utilize the VCOM signal that its output picture is controlled.Technical solution of the present invention is by in time obtaining the index of current environment for use, adjust the VCOM signal according to index, as long as in varying environment, all use suitable VCOM signal to drive LCD, just can guarantee that LCD the Flicker phenomenon can not occur under various environmental baselines, give the display effect of a satisfaction of user.And whole process is transparent to the user, does not need user's intervention fully, has brought convenience also for user's use.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of method of eliminating the LCD picture scintillation, the COM signal of the fixing output of LCD is modulated into the VCOM signal that the flicker of control LCD picture is eliminated, and the VCOM signal input part of the input of the signal after will modulating LCD, it is characterized in that, may further comprise the steps:
A) obtain the current environmental baseline information of living in of LCD;
B) the environmental baseline information that obtains according to step a) by the environmental baseline that sets in advance and the corresponding relation of benchmark numerical value, is obtained the benchmark numerical value of this environmental baseline correspondence;
C) the benchmark numerical value that obtains according to step b) generates the DC level that is used to regulate the VCOM signal;
D) DC level that step c) generated is mixed generation VCOM signal with the COM signal of the fixing output of LCD, export the VCOM signal input part of LCD to.
According to the described method of claim 1, it is characterized in that 2, described step a) specifically comprises: the external environment sensing unit is set, and the external environment sensing unit is surveyed the current environmental baseline of living in of LCD, and result of detection is exported as environmental baseline information.
According to claim 1 or 2 described methods, it is characterized in that 3, described environmental baseline information comprises: brightness, temperature and humidity information.
4, according to the described method of claim 1, it is characterized in that, described step c) specifically comprises: the benchmark numerical value that step b) is obtained produces pwm signal output as input by width modulation, and the Bob that accounts for according to output pwm signal generates the DC level that is used to regulate the VCOM signal again.
According to the described method of claim 1, it is characterized in that 5, described step c) specifically comprises: the benchmark numerical value that step b) is obtained generates the DC level that is used to regulate the VCOM signal as input by digital regulation resistance.
6, according to the described method of claim 1, it is characterized in that, describedly after the described step d) further comprise: at interval one specific period, repeated execution of steps is a) to step d).
7, a kind of device of eliminating the LCD picture scintillation, it is characterized in that, comprise: be used to obtain external environmental condition information the external environment sensing unit, be used to the processor that receives external environmental condition information and export corresponding control signal, the storage unit that is used to preserve environmental baseline and benchmark numerical value corresponding relation, and be used for the VCOM signal generation unit that the receiving processor control signal generates the VCOM signal;
Described processor receives the output signal of external environment sensing unit and storage unit, generate control signal and export VCOM signal generation unit to, the control signal of VCOM signal generation unit receiving processor output and the COM signal of exporting from LCD generate the VCOM signal input part that the VCOM signal exports LCD to.
8, according to the described device of claim 7, it is characterized in that, include low-pass filter and voltage follower in the described VCOM signal generation unit;
After entering VCOM signal generation unit from the control signal of described processor output, generate DC level through low-pass filter and voltage follower successively, mix with the COM signal of exporting from LCD at the voltage follower output terminal, generate the VCOM signal input part that the VCOM signal exports LCD to.
9, described according to Claim 8 device is characterized in that, described processor is the processor that has the PWM unit, and the control signal of processor output is a pwm signal.
10, according to the described device of claim 7, it is characterized in that, include digital regulation resistance in the described VCOM signal generation unit;
After entering VCOM signal generation unit from the control signal of described processor output, generate DC level through digital regulation resistance, mixes with COM signal from LCD output, generation VCOM signal exports the VCOM signal input part of LCD to.
According to the described device of claim 7, it is characterized in that 11, described external environment sensing unit comprises: luminance sensor, temperature sensor and humidity sensor.
According to the described device of claim 7, it is characterized in that 12, described storage unit is a flash memory.
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| CNB2003101130771A CN100489601C (en) | 2003-12-25 | 2003-12-25 | Method and apparatus for eliminating LCD frame flicker phenomenon |
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| CNB2003101130771A CN100489601C (en) | 2003-12-25 | 2003-12-25 | Method and apparatus for eliminating LCD frame flicker phenomenon |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460967C (en) * | 2005-12-14 | 2009-02-11 | 华宇电脑股份有限公司 | Method for inspecting and eliminating liquid-crystal display device ghost image |
| CN110706669A (en) * | 2019-09-19 | 2020-01-17 | 广东长虹电子有限公司 | Voltage compensation circuit |
-
2003
- 2003-12-25 CN CNB2003101130771A patent/CN100489601C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460967C (en) * | 2005-12-14 | 2009-02-11 | 华宇电脑股份有限公司 | Method for inspecting and eliminating liquid-crystal display device ghost image |
| CN110706669A (en) * | 2019-09-19 | 2020-01-17 | 广东长虹电子有限公司 | Voltage compensation circuit |
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| Publication number | Publication date |
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| CN100489601C (en) | 2009-05-20 |
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