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WO2007013251A1 - Unité de source lumineuse pour dispositif d’affichage et dispositif d’affichage utilisant l’unité de source lumineuse - Google Patents

Unité de source lumineuse pour dispositif d’affichage et dispositif d’affichage utilisant l’unité de source lumineuse Download PDF

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Publication number
WO2007013251A1
WO2007013251A1 PCT/JP2006/312777 JP2006312777W WO2007013251A1 WO 2007013251 A1 WO2007013251 A1 WO 2007013251A1 JP 2006312777 W JP2006312777 W JP 2006312777W WO 2007013251 A1 WO2007013251 A1 WO 2007013251A1
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WO
WIPO (PCT)
Prior art keywords
light source
display device
source unit
time
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/312777
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English (en)
Japanese (ja)
Inventor
Masayuki Murao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of WO2007013251A1 publication Critical patent/WO2007013251A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation

Definitions

  • the present invention relates to a light source unit for a display device and a display device including the light source unit, and more specifically, for a display device that performs dimming by a pulse width modulation (PWM) method.
  • PWM pulse width modulation
  • the present invention relates to a light source unit and a display device including the light source unit.
  • a display device including a non-self-luminous display panel such as a transmissive liquid crystal display panel generally has a configuration in which a light source unit is disposed on the back side of the display panel.
  • a display device is configured such that light emitted from the light source unit is transmitted through the display panel from the back side to the front side, and an image is displayed in a visible state on the front side of the display panel.
  • a light control method of such a light source unit for a display device for example, a light control method using a pulse width modulation method is used.
  • the pulse width modulation method is a method of adjusting the ratio of the light emission time and the non-light emission time within a predetermined short period called a PWM dimming period according to the brightness adjustment level.
  • the dimming method using such a pulse width modulation method has a wider dimming range than the conventional current control method, that is, the dimming method of adjusting the current value flowing through the light source in an analog manner. If you can, you have the advantage. For this reason, it is now widely used.
  • the light emission and non-light emission of the light source are alternately repeated in a short cycle, so that the light emission and non-light emission cycle and the vertical synchronization signal of the display panel May interfere.
  • V, V when horizontal stripe fringes appear on the display panel and flow in the vertical direction, V, V, and so-called wobbling noise may occur.
  • JP 2002-287700 A, JP 2002-354823 A, and JP 2004-259510 A are listed.
  • the display panel when using the display panel as a television receiver, etc., the display panel may be configured to support both NTSC and PAL signals, and the user may select and use the signal system. Can be mentioned. Moreover, it is configured to output a plurality of vertical synchronization signals having different frequencies as in a personal computer, and the intermediate user may select or switch between them as appropriate.
  • the problem to be solved by the present invention is that interference fringes are formed on the display panel. It is possible to provide a light source unit and a display device that do not generate a single buzzing noise, particularly when a vertical synchronization signal used for driving a display panel is used by selecting or switching different frequency forces. Providing a light source unit and display device that do not generate wobbling noise, or when adjusting the brightness, interference fringes do not generate wobbling noise at a specific brightness. A light source unit and a display device are provided.
  • a light source unit is set by a user in a light source unit for a display device that supplies a light source with a signal in which an on-time for turning on the light source appears periodically.
  • a light control means for generating a light source control signal obtained by thinning the on-time for turning on the light source from this signal at irregular timings.
  • the light source unit for the display device turns on the light source according to a means for generating a random number, a random value generated by the means for generating a random number, and a brightness adjustment level set by the user.
  • the signal power in which the on-time appears periodically may be configured to include a dimming unit that generates a light source control signal by thinning out the on-time at random.
  • a plurality of setting storage means for storing, and a dimming means for extracting a plurality of setting power settings stored by the setting storage means based on the generated random number and generating a light source control signal based on the extracted settings It may be a configuration.
  • a configuration including a voltage value reading circuit that reads the voltage of the power source that drives the light source and a conversion means that converts the read voltage value into a random value can be applied.
  • a display device has a configuration in which any one of the light source units for the display device is incorporated.
  • the on-time is thinned out at irregular timings, so that the onset timing of the blanking time when the light source is not turned on has no periodicity. Therefore, even if the vertical sync signal power input to the display panel is a certain frequency, or at any brightness, no interference occurs between the occurrence of the blanking time and the vertical sync signal. . As a result, generation of interference fringes on the display panel and occurrence of wobbling noise due to vertical movement of the generated interference fringes can be prevented.
  • FIG. 1 is a block diagram showing a main part of a configuration of a light source unit according to a first embodiment of the present invention and a display device incorporating the light source unit.
  • FIG. 2 is a flowchart showing a light source control signal generation method in the light source unit according to the embodiment.
  • FIG. 3 is a schematic diagram showing a configuration of a random number generation circuit included in random number generation means of the light source unit according to the embodiment.
  • FIG. 4 is a block diagram showing a main part of a configuration of a light source unit according to a second embodiment of the present invention and a display device incorporating the light source unit.
  • FIG. 5 is a block diagram showing a main part of a configuration of a light source unit according to a third embodiment of the present invention and a display device incorporating the light source unit.
  • the light source unit for the device alternately turns on and off the light source based on the high-frequency lighting pulse voltage.
  • the lighting pulse voltage is a high-frequency pulse voltage in which an on-time and an off-time alternately appear periodically, and the light source is turned on during the on-time of the lighting pulse voltage and turned off during the off-time.
  • the brightness of the light source is adjusted by setting the timing at which the light source is not turned on by thinning the on-time of the lighting pulse voltage (hereinafter referred to as “blanking time”). This is done by increasing or decreasing the number of occurrences. Then, by causing this blanking time to appear at irregular timings, the operating force periodicity of turning on and off the light source is eliminated.
  • FIG. 1 is a block diagram showing a main part of the configuration of a light source unit according to the first embodiment of the present invention and a display device including the light source unit.
  • the light source unit includes a light source, a user interface, PWM dimming means, random number generation means, and light source driving means.
  • a conventional general light source such as a fluorescent tube such as a cold cathode tube or a hot cathode tube can be applied.
  • the user interface is operated by the user to adjust the brightness of the light source, and generates a signal corresponding to the operation.
  • the random number generation means has a random number generation circuit therein and generates a random number within a predetermined numerical range.
  • the PWM dimming unit generates a light source control signal based on a signal from the user interface and a random number from the random number generation unit.
  • This light source control signal is a signal that defines the specific number of times and timing of the blanking time.
  • the light source drive means is equipped with an inverter circuit that can generate a high-frequency and high-frequency pulse voltage inside it, and generates a lighting pulse voltage that drives the light source based on the light source control signal from the PWM dimming means and applies it to the light source To do.
  • the light source unit subdivides the time during which the light source unit is operating into a predetermined short period, generates a light source control signal for each period, and controls the light source for each period. To do.
  • Each subdivided period is referred to as “PWM dimming period” or simply “period”. In the following, “period” refers to PWM dimming period unless otherwise specified.
  • the display device incorporating the light source unit includes a display panel that displays an image and a control signal based on an image signal input from the outside.
  • LCD controller that generates a signal
  • source driver and a gate driver that drive the display panel based on the control signal.
  • the display panel can be a conventional transmissive liquid crystal display panel, and the LCD controller, source driver, and gate driver can be conventional ones. Therefore, these descriptions are omitted.
  • FIG. 2 is a flowchart showing a flow of generating a light source control signal in the light source unit according to the first embodiment. The procedure for generating the light source control signal will be described with reference to FIG.
  • the user interface When the user operates the user interface, the user interface outputs a signal corresponding to the user's operation, and the dimming ratio D (%) is determined based on this signal (step 1). Based on this dimming ratio D (%), the number M of blanking times within one period is determined (step 2).
  • the dimming ratio D (%) refers to the ratio of the actual number of times of light emission of the light source to the number of on-time times of the lighting pulse voltage that can be set to the maximum within one period.
  • the period of the lighting pulse voltage is P,
  • the number of on-times N is the PWM dimming period P divided by the lighting pulse voltage period P
  • N P ZP.
  • the number of occurrences of blanking time M is M 2 (P / P) X (100—D) ZlOO
  • Z ⁇ X (100—D) Determined by ZlOO.
  • Z is the number of times the light source is turned on when the dimming ratio D is 0%. In other words, in this case, the number of times the light source is turned on within one cycle is changed according to the dimming ratio between Z times and N times.
  • a random number R is generated by (Step 5), and it is determined whether or not the generated random number is a specific numerical value (Step 6). If the random number R generated in step 5 is a specific number, the i-th on-time is thinned out to obtain the blanking time (step 7). On the other hand, if the random scale is not a specific value, the i-th on-time is not thinned out (ie, lit) (step 8). In this way, whether or not the generated random number R is a specific numerical power determines whether or not the i-th on-time is thinned out to be the blanking time.
  • the random number generation means and method used here will be described later.
  • the probability that the “specific numerical value” appears in other words, the probability that the i-th on-time is thinned out to be the blanking time varies depending on the dimming ratio D (%).
  • the number of occurrences of blanking time M within one cycle is determined based on the dimming ratio D (%). Therefore, in order to express the number of occurrences M of the determined blanking time without excess or deficiency, the random number R becomes a “specific value” when the dimming ratio D (%) is a large value. Decrease the probability, and if it is a small number, increase the probability.
  • the dimming ratio D is fixed at 80%
  • the value that is divisible by 8 is set as a “specific value”, and when it is fixed at 40%, the value that is divisible by 4 One way is to do this.
  • the remaining number L of blanking times is updated (step 9). Specifically, the number of remaining blanking times after subtracting 1 from the number of remaining blanking times L after step 7 is the new number of remaining blanking times. [0035] Then, it is determined whether or not the updated blanking time remaining count L is 0 (step 10). If the number of remaining blanking times L is 0, it means that the number of occurrences of blanking time M determined in step 2 has actually been set, and thereafter it is necessary to develop the blanking time within this period. Disappear. Therefore, all the on-times after the i + 1st are not thinned out (step 11). And it shifts to the next cycle. On the other hand, if the remaining number L of blanking times is 1 or more, it is necessary to express the blanking time within the cycle, so the processing within the cycle is continued.
  • the remaining number of on-times specifically, the maximum number of on-times within one cycle, N force is also subtracted from the value indicated by counter i, and the numerical value N-i is less than or equal to the remaining number L of blanking times. It is determined whether or not (step 12).
  • the remaining number of on-time N-i is the blanking time during the light source control signal generation process for the period.
  • the number of remaining times needs to be maintained at a value greater than L.
  • the i-th on-time is determined based on the random number R, whether or not the i-th on-time is to be thinned out may result in continuous occurrence of blanking time.
  • the remaining number of on-times N-i decreases, while the remaining number of blanking times L does not decrease, so the remaining number of on-times N-i is smaller than the remaining number of blanking times L. Things can happen.
  • the brightness of the light source in this period is set to be brighter than the original brightness based on the determined dimming ratio D (%).
  • step 15 If the numerical force indicated by the counter i is smaller than the number of on-times within one cycle, the counter i is updated and the process proceeds to the (i + 1) th on-time processing (step 15). On the other hand, when the value indicated by the counter i becomes equal to the number of on-times N in one cycle, the processing for all the on-times in the cycle has been completed.
  • step 16 a step for confirming whether or not to continue the processing and shift to the next cycle is inserted. In principle, the process continues while the light source unit is in operation.
  • FIG. 3 is a diagram showing an example of the configuration of a random number generation circuit applicable in step 5.
  • This random number generation circuit 1 reads the capacity 3 connected to the wiring 2 to which the power supply voltage for driving the light source is applied (the symbol a reaches the wiring connected to the power supply) and the potential of the capacity 3 Potential reading circuit 4 capable of Although the power supply voltage for driving the light source is preferably maintained at a constant value in nature, in practice, it constantly fluctuates in an analog fashion as time passes. Therefore, the fluctuation of the power supply voltage value is read as a random number.
  • the read voltage value is not necessary to use as a random number as it is, and rounding off the decimal point for easy handling in later processing, or adding or integrating a predetermined numerical value so that the random number is within a predetermined numerical range Good. According to such a configuration, it is possible to generate a physical random number that is not a pseudo-random number generated by a general random number generation circuit. Therefore, the timing to thin out the on-time can be made more random, and the periodicity can be eliminated.
  • the blanking time expression timing may be periodic when viewed macroscopically. Therefore, a configuration using a commonly used pseudo-random number generating means may be used.
  • the light source control signal that defines the timing of the occurrence of the blanking time within one cycle is generated.
  • the light source driving means generates a lighting pulse voltage based on the light source control signal thus generated and applies it to the light source.
  • the blanking time appears irregularly, and the light source blinks without periodicity. Therefore, even if the vertical synchronization signal power ⁇ has a certain frequency or the brightness of the light source is adjusted, no interference occurs between the vertical synchronization signal and the light source control signal. As a result, it is possible to prevent interference fringes and occurrence of wobbling noise due to the interference fringes.
  • the light source unit includes a setting table in which the number of occurrences and timing of blanking time within one cycle are set.
  • This setting table has a plurality of settings for one type of dimming ratio D (%). A random number is randomly selected from these multiple settings for each cycle.
  • FIG. 4 is a block diagram showing a main part of the configuration of the light source unit according to the second embodiment and a display device in which the light source unit is incorporated.
  • the light source unit according to the second embodiment includes a light source, a user interface, PWM dimming means, random number generating means, and storage means.
  • the same light source, user interface, light source driving means, and random number generation means as those of the light source unit according to the first embodiment can be applied.
  • the storage means can store the setting of the timing of the blanking time.
  • the display device in which the light source unit is incorporated can be applied with the same configuration as the display device according to the first embodiment except for the light source unit.
  • Table 1 below shows an example of a setting table in which the occurrence timing of blanking time within one period is set.
  • This table uses an example in which the maximum number of on-times that can be set within one period is 20. Each number in this table indicates how many on-times the leading force will decimate for the on-time within each cycle.
  • Each dimming ratio D (%) has 5 settings. The dimming ratio D (%) here is 0% for 10 lighting and 100% for 20 lighting all. The number of on-times per cycle is not limited to 20 and can be set as appropriate. Also, the number of settings for each dimming ratio is not limited to five.
  • the operation of the light source unit having such a configuration is as follows. First, based on the user interface operation by the user, the dimming ratio D (%) in a certain period is determined. . A random number is generated by the random number generation means. This random number generating means has the same configuration as that of the light source unit of the first embodiment, and reads the potential value of the capacity connected to the power supply voltage (see FIG. 3). The read potential value also generates a random number. Table 2 below shows an example of a random number generation method by the random number generation means.
  • the read potential value is 0.1, 0 is generated as a random number, and if the read potential value is 1.7, 3 is generated as a random number. In this way, the read potential value and this surface force random number are generated.
  • the setting of the expression of blanking time in a certain period is selected based on the setting table of Table 2. For example, if the determined dimming ratio D is 80% and the generated random power is ⁇ , the setting that thins out the 8th and 10th on-time is used in that period. .
  • the light source is driven by the light source driving unit based on the selected setting, and the setting in the next period is selected. Thereafter, such an operation is repeated. According to such a configuration, the timing of occurrence of the blanking time becomes random and the periodicity is lost. As a result, the same operational effects as those of the first embodiment can be obtained.
  • the light source unit according to the third embodiment is capable of generating blanking time within one period.
  • One kind of dimming ratio D (% ) A setting table with multiple settings is provided. Then, this setting taper setting is read and used in order for each cycle.
  • FIG. 5 is a block diagram showing a main part of the configuration of the light source unit according to the third embodiment and a display device in which the light source unit is incorporated.
  • the light source unit according to the third embodiment includes a light source, a user interface, PWM dimming means, setting storage means, and light source driving means. These can be the same as the light source unit according to the second embodiment.
  • the same configuration as the display device of the first embodiment or the second embodiment can be applied to the display device in which the light source unit is incorporated, except for the light source unit.
  • the setting table has the same structure as that of the light source unit according to the second embodiment. In other words, each has a plurality of settings for one type of dimming ratio D (%).
  • the operation of the light source unit having such a configuration is as follows.
  • the dimming ratio D (%) is determined based on the operation of the user interface by the user.
  • the setting of the blanking time expression timing corresponding to the determined dimming ratio D (%) is read in order, and the light source driving means drives the light source according to the read setting.
  • the item “random numbers” in Table 1 may be read as “order”.
  • the “order 0” is set, that is, the eighth and tenth on-times are set as blanking times.
  • the process returns to “order 0” in the table and proceeds.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L’invention propose une unité de source lumineuse pour dispositif d’affichage ou un dispositif d’affichage ne provoquant pas de frange d’interférence ou de bruit d’ondulation provoqué par une interférence entre un signal de synchronisation vertical servant à exciter un panneau d’affichage et un cycle flash de la source lumineuse. Une unité de source lumineuse pour dispositif d’affichage pour exploiter une source lumineuse selon un signal dans lequel le temps de MARCHE pour mettre en MARCHE la source lumineuse apparaît de manière périodique, comprend un moyen de génération d’un nombre aléatoire et un moyen de réglage de lumière. Le moyen de réglage de lumière peaufine le temps de MARCHE à partir du signal de manière aléatoire selon le niveau de réglage de luminosité par l’utilisateur de sorte que le temps de masquage avec la source lumineuse ÉTEINTE, apparaît de façon irrégulière.
PCT/JP2006/312777 2005-07-26 2006-06-27 Unité de source lumineuse pour dispositif d’affichage et dispositif d’affichage utilisant l’unité de source lumineuse Ceased WO2007013251A1 (fr)

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JP2005215737 2005-07-26

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04180091A (ja) * 1990-11-15 1992-06-26 Seiko Epson Corp 液晶電気光学素子の駆動方法
JPH07334117A (ja) * 1994-06-09 1995-12-22 Toshiba Corp 多階調表示装置および多階調表示方法
JP2000195695A (ja) * 1998-12-28 2000-07-14 Sony Corp バックライト駆動方法、バックライト駆動回路及び電子機器
JP2000208287A (ja) * 1999-01-18 2000-07-28 Sony Corp バックライト駆動装置及びその駆動方法
JP2001134422A (ja) * 1999-11-02 2001-05-18 Takeshi Saito 熱雑音ランダムパルス発生装置及び乱数生成装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04180091A (ja) * 1990-11-15 1992-06-26 Seiko Epson Corp 液晶電気光学素子の駆動方法
JPH07334117A (ja) * 1994-06-09 1995-12-22 Toshiba Corp 多階調表示装置および多階調表示方法
JP2000195695A (ja) * 1998-12-28 2000-07-14 Sony Corp バックライト駆動方法、バックライト駆動回路及び電子機器
JP2000208287A (ja) * 1999-01-18 2000-07-28 Sony Corp バックライト駆動装置及びその駆動方法
JP2001134422A (ja) * 1999-11-02 2001-05-18 Takeshi Saito 熱雑音ランダムパルス発生装置及び乱数生成装置

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