JPH11305197A - Brightness control device for lcd display device - Google Patents
Brightness control device for lcd display deviceInfo
- Publication number
- JPH11305197A JPH11305197A JP11391698A JP11391698A JPH11305197A JP H11305197 A JPH11305197 A JP H11305197A JP 11391698 A JP11391698 A JP 11391698A JP 11391698 A JP11391698 A JP 11391698A JP H11305197 A JPH11305197 A JP H11305197A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- temperature
- backlight device
- backlight
- lcd display
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、バックライト装
置に印加する電圧に応じてＬＣＤ表示器の輝度を制御す
る輝度制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brightness control device for controlling the brightness of an LCD display according to a voltage applied to a backlight device.
【０００２】[0002]
【従来の技術】図８は例えば、特開昭６４−３２７７７
号公報に示された従来のＬＣＤ表示器の輝度制御装置を
示す回路図であり、１０１は電源、１０２は電源１０１
から供給された電圧から２種類の電圧Ａ、Ｂを作成する
電源回路、１０３は電源回路１０２からの２種類の電圧
Ａ、Ｂを切り替える切り替え回路、１０４は切り替え回
路１０３の切り替え時間を制御するタイマ回路、１０５
はバックライト装置１０６を点灯させる点灯回路であ
る。2. Description of the Related Art FIG.
FIG. 1 is a circuit diagram showing a conventional brightness control device for an LCD display shown in Japanese Patent Application Laid-Open Publication No. H10-101, wherein 101 is a power supply, and 102 is a power supply
A power supply circuit for generating two types of voltages A and B from the voltage supplied from the power supply circuit, a switching circuit 103 for switching between the two types of voltages A and B from the power supply circuit 102, and a timer 104 for controlling the switching time of the switching circuit 103 Circuit, 105
Is a lighting circuit for lighting the backlight device 106.
【０００３】次に動作について説明する。電源回路１０
２は、電源１０１から供給される電圧から２種類の電圧
Ａと電圧Ｂを作成する。電圧Ａと電圧Ｂとは電位が異な
り、電圧Ａは点灯回路１０５の定格電圧で、電圧Ｂは電
圧Ａより高い電圧である。この電圧Ａ、Ｂは切り替え回
路１０３に供給され、電源１０１の電圧印加後、タイマ
回路１０４によって決められた一定時間、点灯回路１０
５に電圧Ｂを与えて高電圧でバックライト装置１０６を
点灯させる。そして、上記の一定時間経過後、タイマ回
路１０４の出力によって切り替え回路１０３を切り替
え、点灯回路１０５に定格電圧である電圧Ａを印加す
る。このように、電圧印加開始時、一定時間点灯回路１
０５への投入電力を高くすることにより、低温時でも安
定した起動特性および輝度が得られる。Next, the operation will be described. Power supply circuit 10
2 generates two types of voltage A and voltage B from the voltage supplied from the power supply 101. The voltage A and the voltage B have different potentials. The voltage A is a rated voltage of the lighting circuit 105, and the voltage B is higher than the voltage A. The voltages A and B are supplied to the switching circuit 103, and after the voltage of the power supply 101 is applied, the lighting circuit 10 is turned on for a certain time determined by the timer circuit 104.
5 to apply a voltage B to turn on the backlight device 106 at a high voltage. After the elapse of the predetermined time, the switching circuit 103 is switched by the output of the timer circuit 104, and the voltage A, which is a rated voltage, is applied to the lighting circuit 105. Thus, at the start of voltage application, the lighting circuit 1 for a certain period of time.
By increasing the power supplied to the power supply 05, stable start-up characteristics and luminance can be obtained even at low temperatures.
【０００４】[0004]
【発明が解決しようとする課題】従来のＬＣＤ表示器の
輝度制御装置は以上のように構成されているので、高い
電圧Ｂから定格電圧である電圧Ａへの切替時に、両者の
電圧差が大きいと、図９（ａ）に示すように、その切替
時の輝度変化、つまり輝度低下が目立ち、この電圧差を
大きくしないと、図９（ｂ）に示すように、輝度立ち上
がり特性を良くすることができないという課題があっ
た。Since the conventional brightness control device for an LCD display is constructed as described above, the voltage difference between the two at the time of switching from the high voltage B to the rated voltage A is large. As shown in FIG. 9A, a change in luminance at the time of the switching, that is, a decrease in luminance is conspicuous, and if this voltage difference is not increased, the luminance rise characteristic is improved as shown in FIG. 9B. There was a problem that can not be.
【０００５】この発明は、上記の課題を解決するために
なされたもので、作動時におけるバックライト装置の温
度に基づいて該バックライト装置への印加電圧を制御し
て、輝度変化を円滑に行いながら低温時における輝度立
ち上り特性を改善することのできるＬＣＤ表示器の輝度
制御装置を得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and controls the voltage applied to the backlight device based on the temperature of the backlight device during operation to smoothly change the luminance. It is an object of the present invention to obtain a brightness control device for an LCD display which can improve brightness rise characteristics at low temperatures.
【０００６】[0006]
【課題を解決するための手段】この発明に係るＬＣＤ表
示器の輝度制御装置は、作動時におけるバックライト装
置の温度を検出する温度検出手段と、この温度検出手段
の検出温度に基づいてバックライト装置に印加する電圧
を制御する制御手段を備えたものである。SUMMARY OF THE INVENTION A brightness control device for an LCD display according to the present invention includes a temperature detecting means for detecting a temperature of a backlight device during operation, and a backlight based on a temperature detected by the temperature detecting means. It is provided with control means for controlling the voltage applied to the device.
【０００７】この発明に係るＬＣＤ表示器の輝度制御装
置は、作動時におけるバックライト装置の温度を検出す
る温度検出手段と、この温度検出手段の検出温度に基づ
いて決定された時間高電圧を前記バックライト装置に印
加し、前記時間経過後は前記検出温度に基づいて決定さ
れた電圧を前記バックライト装置に印加する制御手段を
備えたものである。A brightness control device for an LCD display according to the present invention includes a temperature detecting means for detecting a temperature of a backlight device at the time of operation, and a time high voltage determined based on a temperature detected by the temperature detecting means. And a control means for applying a voltage determined based on the detected temperature to the backlight device after the time has elapsed.
【０００８】この発明に係るＬＣＤ表示器の輝度制御装
置は、電圧制御を、制御手段からのＰＷＭ制御で行うも
のである。The brightness control device for an LCD display according to the present invention performs voltage control by PWM control from control means.
【０００９】この発明に係るＬＣＤ表示器の輝度制御装
置は、電圧制御を、制御手段からのＰＷＭ信号を平滑し
た電圧値で行うものである。A brightness control device for an LCD display according to the present invention performs voltage control with a smoothed voltage value of a PWM signal from a control means.
【００１０】この発明に係るＬＣＤ表示器の輝度制御装
置は、電圧制御を、制御手段からのＰＷＭ信号で直接行
うものである。A brightness control device for an LCD display according to the present invention performs voltage control directly by a PWM signal from control means.
【００１１】この発明に係るＬＣＤ表示器の輝度制御装
置は、作動時におけるバックライト装置の温度を検出す
る温度検出手段と、この温度検出手段の検出温度に基づ
いて決定された時間の間のみ、基準電圧のｎ倍の高電圧
を前記バックライト装置に印加する制御手段を備えたも
のである。[0011] The brightness control device for an LCD display according to the present invention comprises a temperature detecting means for detecting the temperature of the backlight device at the time of operation, and a time period determined based on the temperature detected by the temperature detecting means. The backlight device is provided with control means for applying a high voltage n times the reference voltage to the backlight device.
【００１２】[0012]
【発明の実施の形態】以下、この発明の実施の一形態を
説明する。 実施の形態１．図１はこの発明の実施の形態１によるＬ
ＣＤ表示器の輝度制御装置の構成を示すブロックであ
り、図において、１は最も高電圧のブースト電圧Ａ、中
間電圧Ｂ、定常電圧Ｃ等の基準電圧をを選択的に切り替
えて出力する電圧切替回路、２は温度検出手段３により
検出された温度に基づいて前記電圧切替回路１の切替を
制御する制御手段としてのＣＰＵ、４は電圧切替回路１
で選択された基準電圧に基づいて電源１５からの直流電
圧を変換するＤＣ−ＤＣコンバータ、５はＤＣ−ＤＣコ
ンバータ４から出力された直流電圧を交流電圧に変換、
昇圧し、バックライト装置６を点灯制御する点灯手段と
してのバックライトインバータである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 shows L according to the first embodiment of the present invention.
In the drawing, reference numeral 1 denotes a voltage switch for selectively switching and outputting a reference voltage such as a boost voltage A, an intermediate voltage B, and a steady voltage C, which are the highest voltages. The circuit 2 is a CPU as control means for controlling the switching of the voltage switching circuit 1 based on the temperature detected by the temperature detection means 3, and the reference numeral 4 is the voltage switching circuit 1
A DC-DC converter for converting a DC voltage from the power supply 15 based on the reference voltage selected in step 5, a DC-DC converter for converting the DC voltage output from the DC-DC converter 4 to an AC voltage,
It is a backlight inverter as lighting means for boosting and controlling lighting of the backlight device 6.
【００１３】次に動作について説明する。液晶表示板を
背面から照射するバックライト装置６の温度の低い点灯
開始時には、この温度を検出した温度検出手段３からの
検出出力に基づいて、ＣＰＵ２は電圧切替回路１を制御
して、図示例のように最も高圧のブースト電圧Ａを基準
電圧として選択し、この基準電圧に基づいてＤＣ−ＤＣ
コンバータ４で電源１５からの直流電圧を変換し、この
直流電圧をバックライトインバータ５に供給する。この
バックライトインバータ５は供給された直流電圧を交流
電圧に変換昇圧してバックライト装置６に供給し、この
バックライト装置６を点灯制御する。Next, the operation will be described. When the backlight device 6 that irradiates the liquid crystal display panel from the back starts lighting at a low temperature, the CPU 2 controls the voltage switching circuit 1 based on a detection output from the temperature detecting means 3 that detects this temperature, and , The highest boost voltage A is selected as the reference voltage, and the DC-DC
The converter 4 converts the DC voltage from the power supply 15 and supplies the DC voltage to the backlight inverter 5. The backlight inverter 5 converts the supplied DC voltage into an AC voltage, boosts the voltage, supplies the AC voltage to the backlight device 6, and controls the lighting of the backlight device 6.
【００１４】そして、バックライト装置６の点灯によっ
て温度が上昇し、図２に示す温度Ｋ1 まで上昇すると、
この温度を検出した温度検出手段３の検出出力に基づい
てＣＰＵ２は電圧切替回路１を切り替えて、中間電圧Ｂ
を基準電圧として選択し、この基準電圧に基づいてＤＣ
−ＤＣコンバータ４で電源１５からの直流電圧を変換
し、この直流電圧をバックライトインバータ５に供給す
る。このバックライトインバータ５は供給された直流電
圧を交流電圧に変換昇圧してバックライト装置６に供給
し、図２に示すように、温度が温度Ｋ2 になるまでバッ
クライト装置６を点灯制御する。[0014] Then, the temperature rises due to lighting of the backlight device 6, when temperature rises to K 1 shown in FIG. 2,
The CPU 2 switches the voltage switching circuit 1 based on the detection output of the temperature detecting means 3 which has detected this temperature, and
Is selected as a reference voltage, and based on this reference voltage, DC
The DC voltage from the power supply 15 is converted by the DC converter 4, and the DC voltage is supplied to the backlight inverter 5. The backlight inverter 5 by boost converter into an AC voltage supplied DC voltage supplied to the backlight unit 6, as shown in FIG. 2, the lighting control of the backlight device 6 until the temperature reaches the temperature K 2 .
【００１５】次いで、温度検出手段３が温度Ｋ2 になっ
たことを検出すると、その検出出力に基づいてＣＰＵ２
は電圧切替回路１を切り替えて定常電圧Ｃを基準電圧と
して選択し、この基準電圧に基づいてＤＣ−ＤＣコンバ
ータ４で電源１５からの直流電圧を変換し、この直流電
圧をバックライトインバータ５に供給する。このバック
ライトインバータ５は供給された直流電圧を交流電圧に
変換昇圧してバックライト装置６に供給し、以後図２に
示すように、定常電圧Ｃを基準電圧としてバックライト
装置６を点灯制御する。Next, when the temperature detecting means 3 detects that the temperature has reached K 2 , the CPU 2 detects the temperature based on the detected output.
Switches the voltage switching circuit 1 to select the steady voltage C as the reference voltage, converts the DC voltage from the power supply 15 with the DC-DC converter 4 based on the reference voltage, and supplies the DC voltage to the backlight inverter 5 I do. The backlight inverter 5 converts the supplied DC voltage into an AC voltage, boosts the voltage, and supplies the AC voltage to the backlight device 6. Thereafter, as shown in FIG. 2, the lighting of the backlight device 6 is controlled using the steady voltage C as a reference voltage. .
【００１６】以上のように、この実施の形態１によれ
ば、バックライト装置６の温度変化に従って、印加電圧
を階段状に変化させることにより、電圧切替時における
輝度変化が小さくなり、図９（ｃ）に示すように、低温
時の輝度立ち上がり特性を改善し、立ち上がり終了後は
自然に一定の輝度に移行させることができる。As described above, according to the first embodiment, by changing the applied voltage in a stepwise manner in accordance with the temperature change of the backlight device 6, the luminance change at the time of voltage switching becomes small, and FIG. As shown in c), the luminance rise characteristics at low temperatures are improved, and the luminance can be naturally shifted to a constant level after the rise is completed.
【００１７】実施の形態２．実施の形態１ではバックラ
イト装置６の温度変化のみによって該バックライト装置
６に供給する電圧を変化させているが、実施の形態２で
は、点灯開始時に温度検出手段３で検出した温度Ｋ1 に
より、図３（Ａ）に示すように温度−時間の特性図から
ブースト電圧Ａの印加時間Ｔ１を決定し、この印加時間
Ｔ1 の経過後は、図３（Ｂ）に示すように中間電圧Ｂを
基準電圧として選択する。そして、バックライト装置６
の温度が温度Ｋ2 を越えると、この温度を検出した温度
検出手段３の検出出力に基づいて、ＣＰＵ２は電圧切替
回路１を切り替えて定常電圧Ｃを基準電圧として選択
し、ＤＣ−ＤＣコンバータ４を介してバックライトイン
バータ５に直流電圧を供給する。このバックライトイン
バータ５は供給された直流電圧Ｃを交流電圧に変換昇圧
してバックライト装置６に供給し、以後、バックライト
装置６を点灯制御する。この結果、図３（Ｃ）に示すよ
うに、実施の形態１のように印加電圧を階段状に変化さ
せることができる。Embodiment 2 FIG. While changing the voltage supplied to the backlight device 6 by only the temperature change in the backlight device 6 in the first embodiment, in the second embodiment, the temperature K 1 detected by the temperature detection means 3 at the lighting start , temperature, as shown in FIG. 3 (a) - determining the application time T1 of the boost voltage a from the characteristic diagram of time, after the application time T 1, the intermediate voltage B as shown in FIG. 3 (B) Is selected as the reference voltage. And the backlight device 6
When the temperature of exceeding the temperature K 2, based on the detection output of the temperature detection means 3 detects this temperature, CPU 2 is the constant voltage C is selected as a reference voltage by switching the voltage switching circuit 1, DC-DC converter 4 A DC voltage is supplied to the backlight inverter 5 through the inverter. The backlight inverter 5 converts the supplied DC voltage C into an AC voltage, boosts the voltage, supplies the AC voltage to the backlight device 6, and thereafter controls the lighting of the backlight device 6. As a result, as shown in FIG. 3C, the applied voltage can be changed stepwise as in the first embodiment.
【００１８】以上のように、この実施の形態２によれ
ば、ブースト電圧を基準電圧として、電源電圧を変換し
て印加する時間を温度により制御することにより、バッ
クライト装置６の温度が高い場合でも、ブースト電圧を
基準電圧として変換した電圧を印加することができ、輝
度立ち上がり特性を改善し、かつ、一定輝度への移行を
円滑に行うことができる。As described above, according to the second embodiment, when the temperature of the backlight device 6 is high by controlling the time for converting and applying the power supply voltage by using the boost voltage as the reference voltage and controlling the application time. However, a voltage obtained by converting the boost voltage as a reference voltage can be applied, and the luminance rising characteristics can be improved, and the transition to a constant luminance can be smoothly performed.
【００１９】実施の形態３．図４はこの発明の実施の形
態３によるＬＣＤ表示器の輝度制御装置の構成を示すブ
ロック図であり、ＤＣ−ＤＣコンバータ４に供給する電
圧制御をＣＰＵ２からのＰＷＭ信号に基づいて行うよう
にようにしたもので、図において、７はＣＰＵ２から出
力されたＰＷＭ信号を平滑する平滑回路であり、他の構
成は図１に示すものと同一であるので、同一部分には同
一符号を付して重複説明を省略する。Embodiment 3 FIG. 4 is a block diagram showing a configuration of a brightness control device for an LCD display according to a third embodiment of the present invention. The control of the voltage supplied to the DC-DC converter 4 is performed based on the PWM signal from the CPU 2. In the figure, reference numeral 7 denotes a smoothing circuit for smoothing the PWM signal output from the CPU 2, and other components are the same as those shown in FIG. A duplicate description is omitted.
【００２０】次に動作について説明する。ＣＰＵ２は温
度検出手段３からの検出出力に応じたＰＷＭ信号を平滑
回路７に供給する。平滑回路７は供給されたＰＷＭ信号
に応じた平滑電圧、つまり直流電圧をＤＣ−ＤＣコンバ
ータ４を介してバックライトインバータ５に供給する。
このバックライトインバータ５は供給された直流電圧を
交流電圧に変換昇圧してバックライト装置６に供給する
もので、点灯開始時における低温度時には、高圧の平滑
電圧が得られ、温度の上昇と共に平滑電圧が低下するよ
うなＰＷＭ信号をＣＰＵ２から出力するようにする。Next, the operation will be described. The CPU 2 supplies a PWM signal corresponding to the detection output from the temperature detecting means 3 to the smoothing circuit 7. The smoothing circuit 7 supplies a smoothed voltage according to the supplied PWM signal, that is, a DC voltage to the backlight inverter 5 via the DC-DC converter 4.
The backlight inverter 5 converts the supplied DC voltage into an AC voltage and boosts it and supplies the AC voltage to the backlight device 6. When the temperature is low at the start of lighting, a high smoothed voltage is obtained, and the smoothed voltage is smoothed as the temperature rises. The CPU 2 outputs a PWM signal whose voltage decreases.
【００２１】以上にように、この実施の形態３によれ
ば、ＣＰＵ２から温度に応じたＰＷＭ信号を出力し、こ
のＰＷＭ信号の平滑電圧でバックライト装置６の印加電
圧を制御することにより、前記実施の形態１におけるよ
うな電圧切替回路１等を必要ととせず、ＣＰＵ２からの
信号線は１本でよく、実施の形態１の構成に比べて構成
を簡素化することができる。As described above, according to the third embodiment, the PWM signal corresponding to the temperature is output from the CPU 2 and the voltage applied to the backlight device 6 is controlled by the smoothed voltage of the PWM signal. The voltage switching circuit 1 and the like as in the first embodiment are not required, and only one signal line from the CPU 2 is required, so that the configuration can be simplified as compared with the configuration of the first embodiment.
【００２２】実施の形態４．図５はこの発明の実施の形
態４によるＬＣＤ表示器の輝度制御装置の構成を示すブ
ロック図であり、ＣＰＵ２からのＰＷＭ信号で直接電源
の電圧を制御する構成である。図において、８は電源の
回路を開閉するスイッチング用トランジスタ、９はイン
ダクタンス９ａとコンデンサ９ｂよりなる平滑回路であ
り、他の構成は図１に示すものと同一であるので、同一
部分には同一符号を付して重複説明を省略する。Embodiment 4 FIG. 5 is a block diagram showing a configuration of a brightness control device for an LCD display according to a fourth embodiment of the present invention, in which the voltage of a power supply is directly controlled by a PWM signal from CPU 2. In the figure, 8 is a switching transistor for opening and closing a power supply circuit, 9 is a smoothing circuit composed of an inductance 9a and a capacitor 9b, and the other components are the same as those shown in FIG. And a duplicate description is omitted.
【００２３】次に動作について説明する。ＣＰＵ２は温
度検出手段３からの検出信号に応じたＰＷＭ信号を出力
する、このＰＷＭ信号に基づいてスイッチング用トラン
ジスタ８の導通、非導通を制御し、ＤＣ−ＤＣコンバー
タ４に供給される電源電圧の印加周期を変化させて、バ
ックライト装置６に対する供給電圧を変化させる。従っ
て、点灯開始時における低温度時には、高圧電圧が得ら
れ、温度の上昇と共に電圧が低下するようなＰＷＭ信号
をＣＰＵ２から出力するようにする。Next, the operation will be described. The CPU 2 outputs a PWM signal corresponding to a detection signal from the temperature detecting means 3. The CPU 2 controls conduction and non-conduction of the switching transistor 8 based on the PWM signal, and controls the power supply voltage supplied to the DC-DC converter 4. The supply voltage to the backlight device 6 is changed by changing the application cycle. Therefore, when the temperature is low at the start of lighting, a high voltage is obtained, and the CPU 2 outputs a PWM signal such that the voltage decreases as the temperature increases.
【００２４】以上のように、この実施の形態４によれ
ば、ＤＣ−ＤＣコンバータ４の縮小が可能となり、全体
の構成をより簡素化することができる。As described above, according to the fourth embodiment, the DC-DC converter 4 can be reduced in size, and the overall configuration can be further simplified.
【００２５】実施の形態５．図６はこの発明の実施の形
態５によるＬＣＤ表示器の輝度制御装置の構成を示すブ
ロック図を示すもので、１０は中間電圧Ｂ、定常電圧Ｃ
等の基準電圧を選択的に切り替えて出力する電圧切替回
路、１１は電源１５からの出力電流を開閉するスイッチ
ング用トランジスタ、１２は昇圧回路、１３は昇圧回路
１２の出力回路を切り替える切り替えスイッチであり、
他の構成は図１に示すものと同一であるので、同一部分
には同一符号を付して重複説明を省略する。Embodiment 5 FIG. FIG. 6 is a block diagram showing a configuration of a brightness control device for an LCD display according to a fifth embodiment of the present invention.
A switching transistor for selectively opening and closing the output current from the power supply 15, a booster circuit 12, and a switch 13 for switching the output circuit of the booster circuit 12. ,
Since other configurations are the same as those shown in FIG. 1, the same portions are denoted by the same reference numerals, and redundant description will be omitted.
【００２６】次に動作について説明する。ＣＰＵ２は温
度検出手段３からの検出信号に応じたＰＷＭ信号を出力
するとともに、その検出温度によって決定される時間、
電圧切替回路１０を制御して中間電圧Ｂを基準電圧とし
て選択し、切り替えスイッチ１３を高圧出力端子Ｏ１に
切り替える。この結果、基準電圧としての中間電圧Ｂを
昇圧回路１２でｎ倍した電圧Ｂ×ｎが切り替えスイッチ
１３を介してバックライトインバータ（図６では図示せ
ず）に供給される。そして、上記時間内において、温度
がある決めた温度以上に上昇したことが検出されると
（図７中Ｐ点）、その温度検出信号に基づいて、ＣＰＵ
２は電圧切替回路１０を制御して、定常電圧Ｃを基準電
圧として選択し、定常電圧Ｃ×ｎが切り替えスイッチ１
３を介してバックライトインバータに供給する。Next, the operation will be described. The CPU 2 outputs a PWM signal corresponding to the detection signal from the temperature detecting means 3 and a time determined by the detected temperature;
By controlling the voltage switching circuit 10, the intermediate voltage B is selected as the reference voltage, and the changeover switch 13 is switched to the high voltage output terminal O1. As a result, a voltage B × n obtained by multiplying the intermediate voltage B as the reference voltage by n in the booster circuit 12 is supplied to the backlight inverter (not shown in FIG. 6) via the changeover switch 13. If it is detected that the temperature has risen above a predetermined temperature within the above-mentioned time (point P in FIG. 7), the CPU detects the temperature based on the temperature detection signal.
2 controls the voltage switching circuit 10 to select the steady voltage C as a reference voltage, and the steady voltage C × n
3 to the backlight inverter.
【００２７】次いで、上記時間が経過すると、ＣＰＵ２
は切り替えスイッチ１３を低圧出力端子Ｏ２に切り替え
て、以後、図７に示すように、定常電圧Ｃを昇圧回路１
２でｍ倍（ｍ＜ｎ）した電圧Ｃ×ｍをバックライトイン
バータに供給する。Next, when the above time elapses, the CPU 2
Switches the changeover switch 13 to the low-voltage output terminal O2, and thereafter, as shown in FIG.
A voltage C × m multiplied by m (m <n) by 2 is supplied to the backlight inverter.
【００２８】以上のように、この実施の形態５によれ
ば、昇圧回路１２と切り替えスイッチ１３とにより、バ
ックライトインバータに供給する電圧を検出温度に基づ
いて変化させるようにしたことにより、電圧切替回路１
０で切り替える電圧の種類を少なくするとともに、バッ
クライトインバータに供給する電圧を滑らかに制御する
ことができ、輝度変化を円滑に行うことができる。As described above, according to the fifth embodiment, the voltage supplied to the backlight inverter is changed based on the detected temperature by the booster circuit 12 and the changeover switch 13, so that the voltage switching Circuit 1
In addition to reducing the number of types of voltages switched at 0, the voltage supplied to the backlight inverter can be controlled smoothly, and the luminance can be smoothly changed.
【００２９】[0029]
【発明の効果】以上のように、この発明によれば、バッ
クライト装置の温度変化に従って、印加電圧を階段状に
変化させるように構成したので、電圧切替時における輝
度変化が小さくなり、低温時の輝度立ち上がり特性を改
善し、立ち上がり終了後は自然に一定の輝度に移行させ
ることができる効果がある。As described above, according to the present invention, since the applied voltage is changed stepwise according to the temperature change of the backlight device, the luminance change at the time of voltage switching becomes small, Has the effect that the luminance can be naturally shifted to a constant luminance after the end of the rise.
【００３０】最も高いブースト電圧を印加する時間を温
度により制御するように構成したので、バックライト装
置の温度が高い場合でも、ブースト電圧を印加すること
ができ、輝度立ち上がり特性を改善し、かつ、一定輝度
への移行を円滑に行うことができる効果がある。Since the time during which the highest boost voltage is applied is controlled by the temperature, the boost voltage can be applied even when the temperature of the backlight device is high, and the luminance rise characteristics are improved. There is an effect that the transition to the constant luminance can be performed smoothly.
【００３１】ＣＰＵから温度に応じたＰＷＭ信号を出力
し、このＰＷＭ信号の平滑電圧でバックライト装置の印
加電圧を制御するように構成したので、電圧切替回路等
を必要とせず、ＣＰＵからの信号線を１本とすることが
でき、構成を簡素化することができる効果がある。Since the CPU outputs a PWM signal corresponding to the temperature and controls the applied voltage of the backlight device with the smoothed voltage of the PWM signal, a voltage switching circuit or the like is not required. There is an effect that the number of lines can be reduced to one and the configuration can be simplified.
【００３２】ＣＰＵからのＰＷＭ信号で直接電源電圧を
制御するように構成したので、ＤＣ−ＤＣコンバータの
縮小が可能となり、全体の構成をより簡素化することが
できる効果がある。Since the power supply voltage is directly controlled by the PWM signal from the CPU, the size of the DC-DC converter can be reduced, and the overall structure can be simplified.
【００３３】昇圧回路と切り替えスイッチとにより、バ
ックライト装置に供給する電圧を検出温度に基づいて変
化させるように構成したので、電圧切替回路で切り替え
る電圧の種類を少なくすることができ、バックライト装
置に供給する電圧を滑らかに制御することができ、輝度
変化を円滑に行うことができる効果がある。Since the voltage supplied to the backlight device is changed based on the detected temperature by the booster circuit and the changeover switch, the types of voltages to be switched by the voltage switching circuit can be reduced, and the backlight device can be reduced. Can be smoothly controlled, and the luminance can be smoothly changed.
【図１】 この発明の実施の形態１によるＬＣＤ表示器
の輝度制御装置の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a brightness control device for an LCD display according to a first embodiment of the present invention.
【図２】 実施の形態１における温度と電圧の関係を示
す特性図である。FIG. 2 is a characteristic diagram showing a relationship between temperature and voltage according to the first embodiment.
【図３】 実施の形態２を説明する特性図であり、
（Ａ）は温度と時間の関係図、（Ｂ）は温度と電圧の関
係図、（Ｃ）は時間と電圧の関係図である。FIG. 3 is a characteristic diagram illustrating Embodiment 2;
(A) is a relationship diagram between temperature and time, (B) is a relationship diagram between temperature and voltage, and (C) is a relationship diagram between time and voltage.
【図４】 この発明の実施の形態３によるＬＣＤ表示器
の輝度制御装置の構成を示すブロック図である。FIG. 4 is a block diagram showing a configuration of a brightness control device for an LCD display according to a third embodiment of the present invention.
【図５】 この発明の実施の形態４によるＬＣＤ表示器
の輝度制御装置の構成を示すブロック図である。FIG. 5 is a block diagram showing a configuration of a brightness control device for an LCD display according to a fourth embodiment of the present invention.
【図６】 この発明の実施の形態５によるＬＣＤ表示器
の輝度制御装置の構成を示すブロック図である。FIG. 6 is a block diagram showing a configuration of a brightness control device for an LCD display according to a fifth embodiment of the present invention.
【図７】 実施の形態５における時間と電圧の関係を示
す特性図である。FIG. 7 is a characteristic diagram showing a relationship between time and voltage in the fifth embodiment.
【図８】 従来のＬＣＤ表示器の輝度制御装置の構成を
示すブロック図である。FIG. 8 is a block diagram showing a configuration of a conventional brightness control device for an LCD display.
【図９】 時間と輝度の関係を示す特性図である。FIG. 9 is a characteristic diagram showing a relationship between time and luminance.
２ ＣＰＵ（制御手段）、３ 温度検出手段、６ バッ
クライト装置。2 CPU (control means), 3 temperature detecting means, 6 backlight device.
Claims (6)
てＬＣＤ表示器の輝度を制御する輝度制御装置におい
て、作動時における前記バックライト装置の温度を検出
する温度検出手段と、この温度検出手段の検出温度に基
づいて前記バックライト装置に印加する電圧を制御する
制御手段を備えたＬＣＤ表示器の輝度制御装置。1. A brightness control device for controlling the brightness of an LCD display according to a voltage applied to a backlight device, comprising: a temperature detection means for detecting a temperature of the backlight device during operation; A brightness control device for an LCD display, comprising: control means for controlling a voltage applied to the backlight device based on a detected temperature.
てＬＣＤ表示器の輝度を制御する輝度制御装置におい
て、作動時における前記バックライト装置の温度を検出
する温度検出手段と、この温度検出手段の検出温度に基
づいて決定された時間高電圧を前記バックライト装置に
印加し、前記時間経過後は前記検出温度に基づいて決定
された電圧を前記バックライト装置に印加する制御手段
を備えたＬＣＤ表示器の輝度制御装置。2. A brightness control device for controlling the brightness of an LCD display according to a voltage applied to a backlight device, comprising: a temperature detection means for detecting a temperature of the backlight device during operation; An LCD display comprising control means for applying a high voltage to the backlight device for a time determined based on the detected temperature to the backlight device, and applying a voltage determined based on the detected temperature to the backlight device after the lapse of the time. Device brightness control device.
で行うことを特徴とする請求項１または請求項２記載の
ＬＣＤ表示器の輝度制御装置。3. The brightness control device for an LCD display according to claim 1, wherein the voltage control is performed by PWM control from a control unit.
を平滑した電圧値で行うことを特徴とする請求項３記載
のＬＣＤ表示器の輝度制御装置。4. The brightness control device for an LCD display according to claim 3, wherein the voltage control is performed with a smoothed voltage value of the PWM signal from the control means.
で直接行うことを特徴とする請求項３記載のＬＣＤ表示
器の輝度制御装置。5. The brightness control device for an LCD display according to claim 3, wherein the voltage control is directly performed by a PWM signal from the control means.
てＬＣＤ表示器の輝度を制御する輝度制御装置におい
て、作動時における前記バックライト装置の温度を検出
する温度検出手段と、この温度検出手段の検出温度に基
づいて決定された時間の間のみ、基準電圧のｎ倍の高電
圧を前記バックライト装置に印加する制御手段を備えた
ＬＣＤ表示器の輝度制御装置。6. A brightness control device for controlling the brightness of an LCD display in accordance with a voltage applied to a backlight device, comprising: a temperature detection means for detecting a temperature of the backlight device during operation; A brightness control device for an LCD display, comprising: control means for applying a high voltage n times a reference voltage to the backlight device only during a time determined based on a detected temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11391698A JP4097774B2 (en) | 1998-04-23 | 1998-04-23 | Brightness control device for LCD display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11391698A JP4097774B2 (en) | 1998-04-23 | 1998-04-23 | Brightness control device for LCD display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11305197A true JPH11305197A (en) | 1999-11-05 |
| JP4097774B2 JP4097774B2 (en) | 2008-06-11 |
Family
ID=14624412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11391698A Expired - Fee Related JP4097774B2 (en) | 1998-04-23 | 1998-04-23 | Brightness control device for LCD display |
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| Country | Link |
|---|---|
| JP (1) | JP4097774B2 (en) |
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| CN115855455B (en) * | 2023-02-27 | 2023-07-11 | 泽景(西安)汽车电子有限责任公司 | Method and device for determining screen temperature of display and storage medium |
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