JP2000200061A - Display device and control method thereof - Google Patents

Display device and control method thereof

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Publication number
JP2000200061A
JP2000200061A JP51299A JP51299A JP2000200061A JP 2000200061 A JP2000200061 A JP 2000200061A JP 51299 A JP51299 A JP 51299A JP 51299 A JP51299 A JP 51299A JP 2000200061 A JP2000200061 A JP 2000200061A
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Prior art keywords
white
display device
emitting
light emitting
light
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JP51299A
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Japanese (ja)
Inventor
Ko Matsushima
鋼 松島
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Nec Corp
日本電気株式会社
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3206Multi-colour light emission
    • H01L27/3211Multi-colour light emission using RGB sub-pixels
    • H01L27/3213Multi-colour light emission using RGB sub-pixels using more than three sub-pixels, e.g. RGBW

Abstract

PROBLEM TO BE SOLVED: To provide a display device and a control method thereof wherein a high brightness level can be achieved with a low electric consumption.
SOLUTION: In this control method, each pixel 101 of a dot matrix consists of four pieces of light emitting elements emitting red, green, blue, and white, and when the brightness levels of the color signals for driving each of the red, green, and blue light emitting elements exceed a prescribed value, the white light emitting element is driven to emit light. Since high brightness can be achieved by making the newly arranged white light emitting element emit light, electric consumption is reduced.
COPYRIGHT: (C)2000,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は表示装置に係り、特にドットマトリックスを用いた表示装置及びその制御方法に関する。 The present invention relates to relates to a display device, particularly to a display apparatus and a control method thereof using a dot matrix.

【0002】 [0002]

【従来の技術】ドットマトリクスを用いたプラズマスクリーンディスプレイのような表示装置は、一般的に赤 Display device, such as a plasma screen display using the Background of the Invention dot matrix, generally red
(R)、緑(G)及び青(B)の3原色を発光する3つの素子で1画素を構成するドットマトリクスによりカラー表示を実現している。 (R), is realized the color displayed by the dot matrix constituting one pixel in the three elements emitting three primary colors of green (G) and blue (B).

【0003】発光素子の原理は、蛍光管の原理と同様であり、R、G及びBに発光する蛍光塗料を一対のガラス板の内部に塗り、そこに紫外線を当てることにより蛍光塗料を発光させている。 The principle of the light emitting element is the same as the principle of the fluorescent tube, R, a fluorescent paint that emits G and B coating the inside of a pair of glass plates, which light is emitted fluorescent paint by applying ultraviolet rays to the ing.

【0004】このようなプラズマディスプレイのカラー化は、通常、RGB着色フィルタあるいはRGB蛍光体を用いて実現される。 [0004] Color of the plasma display is usually implemented using a RGB colored filter or RGB phosphors. 例えば、特開平7−169403 For example, JP-A-7-169403
号公報には、RGB蛍光体を用いてフルカラー表示を実現している。 No. In Japanese realizes full color display using RGB phosphors. 特に、緑色の蛍光体をG蛍光体及びB蛍光体の混合物で構成することにより、白色の再現性をCR In particular, by forming the green phosphor with a mixture of G phosphors and B phosphors, the white reproducibility CR
T(Cathode Ray Tube)に近づけている。 It is close to the T (Cathode Ray Tube).

【0005】 [0005]

【発明が解決しようとする課題】しかしながら、上記従来の構成でも、ブラウン管CRTに比べて輝度レベルが低いために、周囲が明るい場所では画像が見難くなり、 [SUMMARY OF THE INVENTION However, the above also in the conventional structure, due to the low luminance level as compared to a cathode ray tube CRT, the image becomes difficult to see the surroundings are bright place,
更に輝度レベルを改善することが要求されている。 It has been required to further improve the brightness level. 更に、高輝度を低消費電力で達成することも要求されている。 Furthermore, it is also required to achieve high luminance with low power consumption.

【0006】本発明の目的は、低消費電力で高い輝度レベルを達成できる表示装置及びその制御方法を提供することにある。 An object of the present invention is to provide a display apparatus and a control method can achieve a high luminance level with low power consumption.

【0007】 [0007]

【課題を解決するための手段】本発明による表示装置は、ドットマトリクスの各画素が、赤色、緑色、青色、 The display device according to the present invention SUMMARY OF THE INVENTION, each pixel of the dot matrix, red, green, blue,
及び白色を発光する4個の発光素子からなることを特徴とする。 And characterized by comprising the four light emitting elements for emitting white. 白色を発光する発光素子によって画素の輝度レベルを高めることができるために、周囲の輝度が高い場所でも十分に使用可能となる。 In order to be able to increase the brightness level of the pixel by the light-emitting elements for emitting white, becomes sufficiently available in the surrounding luminance is high places. 更に、従来の赤色、緑色、及び青色の3素子による構成の表示装置に比べて、 Furthermore, conventional red, green, and compared to the display device of the configuration according to the blue 3 elements,
高い輝度レベルを低消費電力で達成することができる。 It is possible to achieve high brightness levels with low power consumption.

【0008】更に、本発明による表示装置は、ドットマトリクスの各画素が、赤色、緑色、青色、及び白色を発光する4個の発光素子からなる表示手段と、赤色、緑色及び青色の発光素子をそれぞれ駆動する色信号の輝度レベルが所定値を超えると前記白色を発光する発光素子を駆動して発光させる制御手段と、からなることを特徴とする。 Furthermore, the display device according to the present invention, each pixel of the dot matrix, red, green, blue, and a display unit of four light emitting elements for emitting white, red, green and blue light-emitting element and a control means for the brightness level of the color signal for driving each emit light by driving the light-emitting device emitting the white and exceeds a predetermined value, characterized in that it consists. 新たに設けた白色の発光素子は、画素の輝度レベルが所定値を超えると発光するために、明るい場所でも使用可能となり、しかも1画素あたり1個の発光素子を発光させるだけであるから低消費電力を達成できる。 White light emitting device is newly provided is a low to the luminance level of the pixels emit light exceeds a predetermined value, also becomes available in a bright place, yet since only emit one light emitting element per pixel the power can be achieved.

【0009】 [0009]

【発明の実施の形態】図1は、本発明による表示装置の一実施形態を示す画素構成図である。 Figure 1 DETAILED DESCRIPTION OF THE INVENTION is a pixel configuration diagram showing an embodiment of a display device according to the present invention. 本実施形態の表示装置10は、1画素101当たり赤、緑、青及び白の4 Display device 10 of this embodiment, red per pixel 101, green, blue and white 4
個の発光素子から構成される。 Number of composed from the light-emitting element. ここで、各色の発光素子は、例えばプラズマ発光素子であり、着色フィルタを用いたものでも良いし、上述したように各色の蛍光体を利用して発光させるものでも良い。 Here, the light emitting element of each color, for example, a plasma light emitting device, may be one using a colored filter may be one which emits light by utilizing the phosphors of the respective colors, as described above.

【0010】図2は、本実施形態における表示補正回路の一例を示す回路図である。 [0010] Figure 2 is a circuit diagram showing an example of a display correction circuit in this embodiment. アナログRGB信号はA/ Analog RGB signal is A /
D変換器201によってデジタル信号に変換される。 D converter 201 is converted into a digital signal. A
/D変換器201は、デジタルR信号S 、デジタルG / D converter 201, a digital R signal S R, the digital G
信号S 及びデジタルB信号S を輝度レベル判定部2 Luminance signal S G and the digital B signal S B level determining section 2
02へ出力すると共に、加算器204〜206へそれぞれ出力する。 And outputs to the 02, and outputs each to the adder 204 to 206.

【0011】輝度レベル判定部202は、後述するように、デジタルRGB信号S 、S 及びS の合計が一定値を超えた場合に補正制御信号S を生成し補正回路203へ出力する。 [0011] luminance level determination section 202, as described later, and outputs the digital RGB signals S R, generates a correction control signal S C when the sum of S G and S B exceeds a predetermined value correction circuit 203 . 補正回路203は補正制御信号S Correction circuit 203 corrects the control signal S C
に従って赤色補正信号C 、緑色補正信号C 、青色補正信号C 、及び白色信号S を生成し、赤色補正信号C 、緑色補正信号C 、及び青色補正信号C を加算器204〜206へそれぞれ出力し、白色信号S を表示装置10へ出力する。 Red correction signal C R, a green correction signal C G, blue correction signals C B, and the white signal to generate a S W, the red correction signal C R, a green correction signal C G, and the adder blue correction signal C B 204 in accordance and outputs to -206, and outputs the white signal S W to the display device 10. なお、補正回路203は、RG The correction circuit 203, RG
B補正信号C 、C 及びC の各レベルと白色信号S B correction signal C R, the level and the white signal S C G and C B
のレベルとを調整可能である。 And the W level of which is adjustable. 例えば、RGB補正信号C 、C 及びC によってデジタルRGB信号S 、S 及びS の各レベルを一定量下げた場合に、 For example, RGB correction signals C R, C G and C B by the digital RGB signals S R, if each level of S G and S B is lowered a predetermined amount,
白色信号S のレベルを一定量上昇させることで、同じ輝度レベルをより低い消費電力で達成できる。 The level of the white signal S W by raising a certain amount, can achieve the same luminance level lower power consumption.

【0012】加算器204はデジタルR信号S と赤色補正信号C とを加算して赤色信号を表示装置10へ出力する。 [0012] Adder 204 outputs to the display device 10 the red signal by adding the digital R signal S R and a red correction signal C R. 同様に、加算器205はデジタルG信号S と緑色補正信号C とを加算して緑色信号を表示装置10 Similarly, the adder 205 display a green signal by adding the digital G signal S G and a green correction signal C G 10
へ出力し、加算器206はデジタルB信号S と青色補正信号C とを加算して青色信号を表示装置10へ出力する。 Output to the adder 206 outputs to the display device 10 the blue signal by adding the blue correction signal C B digital B signal S B.

【0013】このようにして得られた赤色信号、緑色信号、青色信号及び白色信号S が表示装置10へ出力され、各画素を構成する赤、緑、青及び白の4個の発光素子を各色の信号レベルの応じた発光量で発光させる。 [0013] red signal obtained in this manner, green signal, blue signal and a white signal S W is output to the display device 10, component red pixels, green, four light emitting elements of blue and white emit light at light emission amount according to the signal level of each color. プラズマディスプレイの各発光素子の駆動回路自体は周知であるからここでは説明を省略する。 Driving circuit itself of each light-emitting element of the plasma display will be omitted here since it is well known.

【0014】輝度レベル判定部202は、表1に示すように、デジタルRGB信号S 、S [0014] luminance level determination section 202, as shown in Table 1, the digital RGB signals S R, S 及びS のトータル値が一定値(ここでは、16進表示で180h)を超えた場合に、そのRGBトータル値に応じて補正制御信号S を変化させ、補正回路203は補正制御信号S Total value constant values of G and S B (in this case, 180h in hexadecimal notation) if it exceeds, by changing the correction control signal S C in accordance with the RGB total value, the correction circuit 203 corrects the control signal S C
に従って白色信号S のレベルの変化させる。 Changing the level of the white signal S W according.

【表1】 [Table 1]

【0015】このように白色信号S のレベルを変化させることで、輝度レベルの高い表示が可能となる。 [0015] By changing the level of such white signal S W, it is possible to display with high luminance levels. しかも、1画素あたり1個の白色発光素子の発光量を増大させるだけで輝度レベルを増大させることができるために、3個のRGB発光素子の発光量を同時に上昇させるよりも低電力で高輝度表示を得ることができる。 Moreover, 1 just in order to be able to increase the brightness level increases the amount of light emission of a single white light emitting element per pixel, high luminance at a lower power than the increase three light emitting quantity of RGB light-emitting element at the same time it is possible to obtain a display.

【0016】更に、補正回路203が生成するRGB補正信号C 、C 及びC によってRGBデジタル信号S 、S 及びS の各レベルを低下させ、且つ白色信号S Furthermore, reduced RGB digital signals S R, each level of S G and S B by the RGB correction signals C R, C G and C B the correction circuit 203 generates and white signal S のレベルを増加させることによって、同程度の輝度レベルをより低い電力で達成することも可能となる。 By increasing the W level, it is possible to achieve the same degree of brightness levels at lower power.
例えば、補正制御信号S の上位3桁が“111h”の場合にはRGB補正を行うこととし、表2に示すように、調整することも可能である。 For example, in the case of the correction control signals upper three digits of S C is "111h" is set to be performed RGB correction, as shown in Table 2, it is possible to adjust.

【0017】 [0017]

【表2】 [Table 2]

【0018】 [0018]

【発明の効果】本発明によれば、従来の3個のRGB発光素子に加えて白色の発光素子を設けることにより、輝度レベルの高い表示を低電力で実現することが可能となる。 According to the present invention, by addition to the traditional three RGB light emitting elements provided white light emitting element, it is possible to realize display with high brightness levels at low power. 更に、高輝度レベルを低電力で得ることができるために、明るい場所で使用することができ、携帯機器の表示装置に用いることも可能となる。 Furthermore, in order to be able to obtain a high luminance level in a low power, can be used in a bright place, it can be used for a display device of the portable device.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明による表示装置の一実施形態を示す画素構成図である。 1 is a pixel block diagram showing an embodiment of a display device according to the present invention.

【図2】本実施形態における表示補正回路の一例を示す回路図である。 2 is a circuit diagram showing an example of a display correction circuit in this embodiment.

【符号の説明】 DESCRIPTION OF SYMBOLS

10 表示装置 101 画素 201 A/D変換部 202 輝度レベル判定部 203 補正回路 204〜205 加算器 10 display device 101 pixel 201 A / D converter 202 luminance level judging unit 203 correction circuit 204-205 adder

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl. 7識別記号 FI テーマコート゛(参考) G09F 9/313 G09F 9/313 A G09G 3/28 H01J 11/02 B H01J 11/02 G09G 3/28 K ────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. 7 identification mark FI theme Court Bu (reference) G09F 9/313 G09F 9/313 a G09G 3/28 H01J 11/02 B H01J 11/02 G09G 3/28 K

Claims (7)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 ドットマトリクスを用いた表示装置において、 前記ドットマトリクスの各画素は、赤色、緑色、青色、 In the display device using a method according to claim 1 dot matrix, each pixel of the dot matrix, red, green, blue,
    及び白色を発光する4個の発光素子からなることを特徴とする表示装置。 And a display device characterized by comprising four light-emitting element which emits white.
  2. 【請求項2】 ドットマトリクスの各画素が、赤色、緑色、青色、及び白色を発光する4個の発光素子からなる表示手段と、 前記赤色、緑色及び青色の発光素子をそれぞれ駆動する色信号の輝度レベルが所定値を超えると、前記白色を発光する発光素子を駆動して発光させる制御手段と、 からなることを特徴とする表示装置。 Each pixel of 2. A dot matrix, red, green, blue, and a display unit of four light emitting elements for emitting white, the red, green and color signals for driving the blue light emitting elements respectively When the luminance level exceeds a predetermined value, a display device comprising a control means for emitting light by driving the light-emitting device emitting the white, in that it consists of.
  3. 【請求項3】 前記制御手段は、前記輝度レベルと前記所定値との差に応じて前記白色を発光する発光素子の発光量を増大させることを特徴とする請求項2記載の表示装置。 Wherein said control means, a display device according to claim 2, wherein to increase the amount of light emitted from the light emitting device emitting the white according to the difference between the predetermined value and the luminance level.
  4. 【請求項4】 前記制御手段は、前記輝度レベルと前記所定値との差に応じて前記白色を発光する発光素子の発光量を増大させ、且つ前記輝度レベルと前記所定値との差に応じて前記赤色、緑色及び青色の発光素子の発光量を減少させることを特徴とする請求項2記載の表示装置。 Wherein said control means, in accordance with the difference between the luminance level and the predetermined value to increase the amount of light emitted from the light emitting device emitting the white, and according to the difference between the predetermined value and the luminance level the red display device of claim 2, wherein reducing the emission amount of the green and blue light emitting elements Te.
  5. 【請求項5】 ドットマトリクスの各画素が、赤色、緑色、青色、及び白色を発光する4個の発光素子からなる表示装置の制御方法において、 前記赤色、緑色及び青色の発光素子をそれぞれ駆動する色信号の輝度レベルを算出し、 前記輝度レベルが所定値を超えると前記白色を発光する発光素子を駆動する、 ことを特徴とする表示装置の制御方法。 Each pixel of claim 5 dot matrix, red, green, blue, and a control method of a display device consisting of four light emitting elements for emitting white, to drive the red, green and blue light emitting elements respectively control method of the display device calculates the luminance level of the color signal, the luminance level to drive the light-emitting device emitting the white and exceeds a predetermined value, it is characterized.
  6. 【請求項6】 前記輝度レベルと前記所定値との差に応じて前記白色を発光する発光素子の発光量を増大させることを特徴とする請求項5記載の表示装置の制御方法。 6. A control method of a display device according to claim 5, wherein to increase the amount of light emitted from the light emitting device emitting the white according to the difference between the predetermined value and the luminance level.
  7. 【請求項7】 前記輝度レベルと前記所定値との差に応じて前記白色を発光する発光素子の発光量を増大させ、 前記輝度レベルと前記所定値との差に応じて前記赤色、 7. increase the amount of light emitted from the light emitting device emitting the white according to the difference between the predetermined value and the luminance level, the red in accordance with the difference between the predetermined value and the luminance level,
    緑色及び青色の発光素子の発光量を減少させる、 ことを特徴とする請求項5記載の表示装置の制御方法。 Reducing the emission amount of the green and blue light emitting elements, a control method of a display device according to claim 5, wherein a.
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