.201037692 六、發明說明： 【發明戶斤屬之技術領域3 技術領域 本發明係關於電子紙裝置及電子紙裝置之顯示控制方 法者。 I：先前技術3 背景技術 使用具有記憶性之液晶顯示裝置之電子紙裝置已實用 ® 化。電子紙裝置於重寫資料後，因為沒有必要供給用於顯 示之電力，所以可實現低電力消費之顯示裝置。 專利文獻1中記載了 .在具有較顯不區廣之可視區的液 晶面板中，於可視區内顯示區域外設置更新用假電極並於 ' 該假電極施加電壓，而藉此消除於附著於顯示區外之壓痕。 專利文獻2中記載了 ：於顯示具有記憶性之膽固醇相液 晶顯示裝置中，於進行部份重寫時，會因應不進行重寫之 區域之串擾所造成之反射率低落量而進行修正。 ❹ 而於電子紙中重複部分重寫，會造成已進行部份重寫 區域與沒有進行部份重寫區域產生亮度差。 第6圖係電子紙之部分重寫之問題點的說明圖。如第6 圖所示，samplel與sample2的選擇晝面中，當使用者選擇 sample2時，sample2之選擇钮顯示為黑色。此時，包含選 擇鈕，僅重寫第6圖中虛線所包圍之區域。 電子紙顯示裝置中所使用之液晶（例如膽固醇液晶） 因溫度或溼度，反射率之特性變化會很大。亦即，即使進 201037692 行了將同樣資料寫入液晶之處理’於20° (：與5° c中重寫處理 後之液晶反射率會不同。亦即’重複進行如前述之部分重 寫，而往已進行部份重寫區域之寫入處理時的溫度或溼度 與往沒有進行部份重寫區域之寫入處理時的溫度或溼度不 同時，會有因反射率變得不同而使亮度差變大而品質低落 之問題點存在。 先行技術文獻 專利文獻1 :特開2002-162642號公報 專利文獻2 :特開2003-228044號公報 C發明内容:J 發明揭示 本發明之課題係，使於電子紙裝置中因部分重寫而造 成之液晶顯示裝置之亮度差不明顯。 本發明之電子紙裝置係包含：液晶顯示部，係具有記憶性 者’記憶機構，係記憶已進行部份重寫區域之起點與終點 的座標者；座標判定機構，係判定接著要進行之部分重寫 區域之起點與終點間的座標是否存在於前述記憶機構中 者；座標管理機構，可於以前述座標判定機構判定該相關 座標存在於前述記憶機構時，由前述記憶機構消除該相關 座標’並將接著要進行之部分重寫區域之起點與終點的座 &儲存於前述記憶機構；座標數判定機構’係判定前述記 隐機構所記憶之座標數是否達到預定值者；及顯示控制機 構係可於以前述座標數判定機構判定前述記憶機構所記 "、座榡數已達前述預定值時，進行前述液晶顯示部之全 201037692 面重寫者。 糟由如前述而構成，可使電子紙裝置之液晶顯示部之 部分重寫區域與其他區域之亮度差變得不明顯。 圖式簡單說明 第1圖係顯示實施型態之電子紙裝置之構成之圖。 第2圖係實施型態之重寫處理之流程圖（1)。 第3圖係實施型態之重寫處理之流程圖（2)。 第4圖係顯示起點與終點之座標之圖。 弟5圖係部份重寫時之座標之說明圖。 第6圖係電子紙之部分重寫之問題點之說明圖。 【賀^方备方式^ j 用以實施發明之最佳形態 以下係針對本發明之最佳實施型態參考圖式加以說 明。第1圖係顯示實施型態之電子紙裝置11之構成之圖。 電子”氏裝置11係具有各種應用程式（群）12、進行電 ◎ 子紙顯示部15之顯示控制的電子紙控制部13、視訊驅動器 14、電子紙顯示部15、視訊及驅動電路丨7。 應用程式12、電子紙控制部13及視訊驅動器14係軟體 所構成。電子紙控制部13係軟體模組’而可以未圖示之Cup 來實現其專之功能。 電子紙顯示部丨5、視訊RAM (以下稱為VRAM) 16及驅動 電路17係硬體所構成。電子紙顯示部15係記憶性之液晶顯 示裝置。 來自應用程式（群）12之晝面繪製指示係輸出至視訊 5 201037692 驅動器14。電子紙控制部13可監看來自應用程式12之繪製 指示，並根據所指示之繪製要求範圍進行部份重寫或全畫 面重寫。 第2圖及第3圖係實施型態之電子紙顯示部15之重寫處 理之流程圖。該重寫處理係藉由電子紙控制部15而實行。 起先，初始化工作用保持起點及種點（S11)。步驟S11 之初始化處理係例如使工作用保持起點及種點之初始值設 為原點（0, 0)。 接著，監看VRAM之重寫對象區域，並取得重寫對象區 域之起點A與終點B (S12)。 為了判定最初之起點，比較VRAM之重寫對象區域之起 點A與工作用保持起點a (最初之判定係初始值），而判定哪 個起點為較廣區域之起點（S13)。 當已判定VRAM16之重寫對象區域之起點A相較於工作 用保持起點a為較廣區域之起點時（SI3, a< A )，進到步驟 S14，而將起點A設定作為工作用保持起點a。 步驟S13之判定處理，例如起點A於X軸上時，以起點A 之X座標與工作用保持起點a之X座標進行比較。又，起點A 於Y轴上時，以起點A之y座標與工作用保持起點a之y座標進 行比較。 其他方面，當於步驟S13中，已判定VRAM16之重寫對象 區域之起點A相較於工作用保持起點a為較窄區域之起點 時，進入步驟S15，而接著進行終點之判定。於步驟S15中， 會比較V R Α Μ16之重寫對象區域之終點B與工作用保持終點 201037692 b，而判定哪個終點惟較廣領域之終點。 當已判定VRAM16之重寫對象區域之終點B相較於工作 用保持終點b為較廣區域之終點b時（S15, b<B)，進到步驟 S16，而將終點B設定作為工作用保持終點b。 另一方面，當已判定VRAM16之重寫對象區域之終點B 相較於工作用保持終點b為較窄區域之終點時，進到步驟 S17。 藉由前述步驟S15及S16之處理，可在已判定VRAM16之 重寫對象區域之終點B相較於現行工作用保持終點b為較廣 區域之終點時，將該終點B作為新的工作用保持終點b儲存 於記憶體等記憶部。 步驟S17係判定是否已經過一定之監看時間。當未經過 一定之間看時間時（S17，N0)，會返回步驟S12重複前述處 理。 當已經過一定之監看時間時（S17，YES)，會進到步驟 S18，而由工作用保持起點a及終點b來決定重寫對象區域之 起點a與終點b。步驟S18接下來，會進到第3圖之步驟S19(第 三圖之B)。 接著，當以前述之前處理確定重寫對象區域之起點a 與終點b後，針對電子紙顯示部15之畫面重寫時之處理參考 第3圖之流程圖加以說明。 於步驟S19中，可判定繪製指示是否為全畫面重寫。於 步驟S19中，當判定繪製指示為部分重寫時（S19，部分重 寫），會進到步驟S20，而判定接著要進行部分重寫區域之 201037692 起點a與終糊之錢是碎在於記㈣（例如記憶體）。 前述之步驟S20之處理，例如在接著要進行部分重寫之 區域之起點與終點在x軸上時，（在此稱為橫向重寫），判定 重寫對象區域之起點似座標與終點h賴狀座標是 否記憶於記憶部。在接著要進行部分重寫之區域之起點與 ”、點在Y軸_L ’（在此稱為縱向重寫），判定重寫對象區域 之起點a之y座標與終點b<y座標間之座標是否記憶於記憶 部。 當此次進行部分重寫區域之起點a與終點b間之座標存 在於記憶部時，亦即，該次之前已進行過部分重寫，而此 -人進行部分重寫之區域存在包含一部分或全部之區域時 (S20，a、b間存在座標），會進到步驟S21，而消除儲存於 6己憶部之該相關座標。此為，將包含之前已進行部分重寫 區域的廣區域之部分重寫進行更新，而藉此使包含於該區 域之部分區域之亮度差變得不明顯。 在此，參考第4圖而針對記憶於記憶部之起點與終點之 座標加以說明。本實施形態中，將進行部分重寫區域之起 點與終點之座標，如第4圖所示儲存至記憶部（例如記憶體） 之表21。 表21中’於部分重寫進行之順序，儲存了顯示部分重 寫區域方向（縱或橫方向）之資料、起點之χ座標、y座標、 終點之X座標及y座標。橫方向係於起點與終點在X軸上之情 況，而縱方向係於起點與終點在Y軸上之情況下。 藉由第3圖之步驟S20之判定處理，當此次進行部分重 201037692 寫區域之起點3與終點⑽之座標料在於記㈣時（S20， 不存在），#進到步驟S22，而將此次進行部分重寫區域之 起點a與終點b保存於記憶部。步驟奶之處理係，例如將起 點a與終點b之座標儲存至第4圖之表21。 接著，判定保存（記憶）於記憶部之部分重寫區域之 座標數是否於預定值N以上（S23)。 當保持於記憶部之座標數未超過狀值_ (S23，保 持座標數<N) ’會進到步驟S24，而進行以起點a與終點_ 指定區域之部分重寫。 當保持於記憶部之座標數在預定值N以上時（兕3，N 2保持座標數），會進到步驟S25，而進行全晝面重寫。 由於藉由進行全畫面之重寫，以進行部分重寫區域盘 未進行部分重寫區域之亮度㈣失，因此消除記憶部之保 持座標（S26)。步驟S26之處理係，例如消除儲存於第*圖 表21之複數的起點與終點之座標。 於步驟s19中，以判定緣製指示為全晝面重寫時（si9, 全重寫），會進到步驟S27’而將重寫對象區域之起點成炊 點b暫時記憶至記憶體等。接著’進行以起點a與起點b所指 定之全畫面重寫（S28)。 於步驟S24或S28中，若重寫已終止，會返回步驟su (第32圖之A)而重複前述處理。 在此，針對部分重寫時之座標參考第5圖加以說明。 設定全面重寫後之第1次之部分重寫為橫向重寫，而該 重寫區域之起點之x座標為XI ’終點之χ座標為χ2。這個情 9 201037692 況下，由於部分重寫區域之起點之x座標xl與終點之义座標 χ2間之座標不存在於記憶部’因此會以前述之重寫處理， 而將起點之X座標xl與終點之X座標Χ2保存於記憶部（例如 表 21 )。 設定第2次之部分重寫為橫向重寫，而該重寫區域之起 點之X座標為χ3，終點之X座標為X4。這個情況下，由於起 點之X座標x3與終點之x座標x4間之座標不存在於記憶部， 因此會將起點之X座標χ3與終點之χ座標以保存於記憶部。 其結果，記憶部中保存有χ1、χ2、χ3及Χ4之4個X座標。 設定第3次之部分重寫為橫向重寫，而該重寫區域之起 點之y座標為yi，終點之y座標為y2。這個情況下，由於起 點之y座標yl與終點之y座標y2間之座標不存在於記憶部， 因此會將起點之y座標yl與終點之y座標y2保存於記憶部。.201037692 VI. Description of the Invention: [Technical Field of Invention] The present invention relates to a display control method for an electronic paper device and an electronic paper device. I: Prior Art 3 Background Art An electronic paper device using a memory liquid crystal display device has been practically applied. Since the electronic paper device rewrites the data, since it is not necessary to supply the power for display, a display device with low power consumption can be realized. Patent Document 1 discloses that in a liquid crystal panel having a viewing area which is relatively wide, a dummy electrode for updating is disposed outside the display region in the visible region, and a voltage is applied to the dummy electrode, thereby eliminating the adhesion to Indentation outside the display area. Patent Document 2 describes that in a liquid crystal display device that displays memory, in partial rewriting, correction is performed in response to a decrease in reflectance caused by crosstalk in a region where rewriting is not performed.重复 Repeating partial rewriting in the electronic paper will cause a difference in luminance between the partially rewritten area and the partially unrewritten area. Fig. 6 is an explanatory diagram of a problem of partial rewriting of electronic paper. As shown in Figure 6, in the selection of samplel and sample2, when the user selects sample2, the selection button of sample2 is displayed in black. At this time, the selection button is included, and only the area surrounded by the broken line in Fig. 6 is rewritten. Liquid crystals (for example, cholesteric liquid crystals) used in electronic paper display devices vary greatly in reflectivity characteristics due to temperature or humidity. That is, even if it enters the 201037692 line, the same data is written into the liquid crystal processing 'at 20° (: the liquid crystal reflectance after rewriting with 5° c will be different. That is, 'repeated partially as described above, When the temperature or humidity at the time of writing the partial rewrite area is different from the temperature or humidity when the writing process is not performed in the partial rewrite area, the brightness is different depending on the reflectance. The problem of the problem is that the difference is large and the quality is low. The prior art is disclosed in the patent document: JP-A-2002-162044. The difference in brightness of the liquid crystal display device caused by partial rewriting in the electronic paper device is not obvious. The electronic paper device of the present invention comprises: a liquid crystal display portion, which has a memory-memory mechanism, and the memory has been partially weighted. a coordinate object of the start point and the end point of the write area; the coordinate determination mechanism determines whether the coordinates between the start point and the end point of the partial rewrite area to be performed next are present in the memory mechanism; coordinates The management unit may store the seat & The memory mechanism; the coordinate number determining means 'determines whether the number of coordinates stored by the predetermined locking means reaches a predetermined value; and the display control means determines that the memory means is recorded by the coordinate number determining means." When the number has reached the predetermined value, the entire 201037692 surface rewrite of the liquid crystal display unit is performed. The configuration is as described above, and the luminance difference between the partially rewritten area and the other areas of the liquid crystal display unit of the electronic paper device can be made. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a configuration of an electronic paper apparatus of an embodiment. Fig. 2 is a flow chart (1) of a rewriting process of an embodiment. Fig. 3 is an embodiment of the embodiment. Flowchart of rewriting process (2). Figure 4 shows the coordinates of the coordinates of the start point and the end point. The figure 5 shows the coordinates of the coordinates when partially rewritten. BRIEF DESCRIPTION OF THE EMBODIMENT OF THE INVENTION The following is a description of the preferred embodiment of the present invention. The first embodiment shows the implementation. The electronic paper device 11 has various application programs (groups) 12, an electronic paper control unit 13 that performs display control of the electric paper display unit 15, a video driver 14, and an electronic device. The paper display unit 15 and the video and drive circuit 丨7. The application 12, the electronic paper control unit 13, and the video driver 14 are software. The electronic paper control unit 13 is a software module' and can be implemented by a CPU (not shown). The electronic paper display unit 、5, the video RAM (hereinafter referred to as VRAM) 16 and the drive circuit 17 are hardware components. The electronic paper display unit 15 is a memory liquid crystal display device. The face drawing instruction from the application (group) 12 is output to the video 5 201037692 driver 14. The electronic paper control unit 13 can monitor the drawing instruction from the application 12 and perform partial or full-picture rewriting according to the indicated drawing request range. Fig. 2 and Fig. 3 are flowcharts showing the rewriting process of the electronic paper display unit 15 of the embodiment. This rewriting process is performed by the electronic paper control unit 15. At the beginning, the initialization work maintains the starting point and the seed point (S11). The initialization processing of step S11 is, for example, setting the initial value of the work holding start point and the seed point as the origin (0, 0). Next, the rewrite target area of the VRAM is monitored, and the start point A and the end point B of the rewrite target area are obtained (S12). In order to determine the initial starting point, the starting point A of the rewrite target area of the VRAM and the work holding start point a (the initial determination system initial value) are compared, and it is determined which starting point is the starting point of the wider area (S13). When it has been determined that the start point A of the rewrite target area of the VRAM 16 is the start point of the wider area than the work retention start point a (SI3, a < A), the process proceeds to step S14, and the start point A is set as the work retention start point. a. The determination processing of step S13, for example, when the starting point A is on the X-axis, is compared with the X coordinate of the starting point A and the X coordinate of the working holding starting point a. Further, when the start point A is on the Y-axis, the y coordinate of the start point A is compared with the y coordinate of the work holding start point a. Otherwise, when it is determined in step S13 that the start point A of the rewrite target area of the VRAM 16 is the start point of the narrower area than the work hold start point a, the process proceeds to step S15, and then the end point determination is performed. In step S15, the end point B of the rewrite target area of V R Α Μ 16 and the work retention end point 201037692 b are compared, and it is determined which end point is the end point of the wider area. When it has been determined that the end point B of the rewrite target area of the VRAM 16 is the end point b of the wider area than the work hold end point b (S15, b<B), the process proceeds to step S16, and the end point B is set as the work hold. End point b. On the other hand, when it has been determined that the end point B of the rewriting target area of the VRAM 16 is the end point of the narrower area than the work holding end point b, the flow proceeds to step S17. By the processing of the foregoing steps S15 and S16, when the end point B of the rewriting target area of the VRAM 16 has been determined to be the end point of the wider area than the current working holding end point b, the end point B can be held as a new work. The end point b is stored in a memory such as a memory. Step S17 is to determine whether a certain monitoring time has passed. When the time has not elapsed between the certain times (S17, N0), the processing returns to the step S12 to repeat the foregoing processing. When a certain monitoring time has elapsed (S17, YES), the process proceeds to step S18, and the starting point a and the end point b of the rewriting target area are determined by the work holding start point a and the end point b. Next, step S18 proceeds to step S19 of Fig. 3 (B of the third figure). Next, when the start point a and the end point b of the rewriting target area are determined by the foregoing processing, the processing at the time of rewriting the screen of the electronic paper display unit 15 will be described with reference to the flowchart of Fig. 3. In step S19, it may be determined whether the drawing instruction is full screen rewriting. In step S19, when it is determined that the drawing instruction is partial rewriting (S19, partial rewriting), it proceeds to step S20, and it is determined that the starting point a of the 201037692 which is to be partially rewritten and the end of the paste is broken. (d) (eg memory). In the foregoing processing of step S20, for example, when the start point and the end point of the area to be partially rewritten are on the x-axis (herein referred to as horizontal rewriting), it is determined that the starting point of the rewriting object area is like a coordinate and an end point. Whether the coordinates are remembered in the memory. At the start point of the area to be partially rewritten, and "the point is in the Y-axis_L" (herein referred to as vertical rewriting), it is determined that the y coordinate of the start point a of the rewriting target area and the end point b<y coordinate Whether the coordinates are memorized in the memory. When the coordinates between the start point a and the end point b of the partial rewrite area are present in the memory portion, that is, the partial rewriting has been performed before, and the person performs partial weight When there is a region containing some or all of the written regions (S20, there is a coordinate between a and b), the process proceeds to step S21, and the related coordinates stored in the 6-memory portion are eliminated. This is the portion that has been previously included. A portion of the wide area of the rewrite area is rewritten and updated, whereby the luminance difference of the partial area included in the area is made inconspicuous. Here, referring to FIG. 4, the memory is searched for the start point and the end point of the memory unit. In the present embodiment, the coordinates of the start point and the end point of the partial rewrite area are stored in the table 21 of the memory unit (for example, memory) as shown in Fig. 4. In Table 21, the partial rewriting is performed. Order, stored Display the data of the partial rewrite area direction (vertical or horizontal direction), the 起点 coordinate of the starting point, the y coordinate, the X coordinate of the end point, and the y coordinate. The horizontal direction is the case where the start point and the end point are on the X axis, and the vertical direction is tied to In the case where the start point and the end point are on the Y-axis. By the determination processing of step S20 of FIG. 3, when the coordinates of the start point 3 and the end point (10) of the partial write 201037692 are recorded in the fourth (S), there is no existence. Then, # proceeds to step S22, and stores the start point a and the end point b of the partial rewrite area in the memory unit. The processing of the step milk, for example, stores the coordinates of the start point a and the end point b to the table of FIG. 21. Next, it is determined whether or not the number of coordinates stored (memorized) in the partial rewrite area of the memory unit is equal to or greater than a predetermined value N (S23). When the number of coordinates held in the memory unit does not exceed the value _ (S23, the number of coordinates is kept <; N) 'Go to step S24, and perform partial rewriting with the start point a and the end point _ specified area. When the number of coordinates held in the memory unit is greater than or equal to a predetermined value N (兕3, N 2 holds the number of coordinates), Proceeding to step S25, full face rewriting is performed. Since the full-frame rewriting is performed to perform the partial rewriting area disc without the luminance (four) loss of the partially rewritten area, the holding coordinates of the memory unit are eliminated (S26). The processing of step S26 is, for example, eliminated in the first * The coordinates of the start point and the end point of the plural of the graph 21. In the step S19, when the judgment edge instruction is full face rewriting (si9, full rewrite), the process proceeds to step S27' and the rewrite target area is The starting point is temporarily stored in memory b, etc. Then, 'full screen rewriting specified by the start point a and the start point b is performed (S28). In step S24 or S28, if the rewriting is terminated, the process returns to step su ( The foregoing processing is repeated in A) of Fig. 32. Here, the coordinates at the time of partial rewriting will be described with reference to Fig. 5. The first part after the full rewrite is set to be rewritten as the horizontal rewrite, and the x coordinate of the start point of the rewrite area is XI 终点 and the χ coordinate is χ2. In the case of this situation 9 201037692, since the coordinates of the x coordinate xl of the starting point of the partial rewriting area and the coordinate of the ending point χ2 do not exist in the memory section, the rewriting process of the above is performed, and the X coordinate xl of the starting point is The X coordinate Χ 2 of the end point is stored in the memory section (for example, Table 21). The second partial rewrite is set to horizontal rewriting, and the X coordinate of the start point of the rewrite area is χ3, and the X coordinate of the end point is X4. In this case, since the coordinates between the X coordinate x3 of the starting point and the x coordinate x4 of the end point do not exist in the memory portion, the coordinates of the X coordinate χ3 and the end point of the starting point are stored in the memory portion. As a result, four X coordinates of χ1, χ2, χ3, and Χ4 are stored in the memory unit. The third partial rewrite is set to horizontal rewriting, and the y coordinate of the starting point of the rewriting area is yi, and the y coordinate of the ending point is y2. In this case, since the coordinates between the y coordinate y of the starting point and the y coordinate y2 of the end point do not exist in the memory portion, the y coordinate y of the starting point and the y coordinate y2 of the end point are stored in the memory portion.
其結果’記憶部中保存有X卜x2、x3、x4、yl及y2之6個X 座標。 设定第η次之部分重寫為橫向重寫，而該重寫區域之起 點之X座彳示為沾’終點之X座標為χ6。這個情況下，由於起 點之χ座標χ5與終點之X座標χ6間之座標χ3存在於記憶部， 因此將該座標χ3由記憶部中消除。其結果，記憶部中保存 有x2、x3、x4、x5、yl及y2之7個χ座標。 第η次之部分重寫區域之起點之χ座標χ5與終點χ座標 x6間之座標存在於記憶部中時，會藉由進行第η次部分重 寫’而使以座標xl為起點之區域的一部分（或全部）亦進 行重寫。其結果，由於第η次部分重寫區域與以包含於該領 201037692 域之座標xl為起點之區域之一部分（或全部）之區域之亮 度差可被忽略，因此將座標xl由記憶部消除。又，消除之 座標不限1個，當其間存在複數個座標時可將其等座標消 除。 前述之實施形態係，將已進行部分重寫區域之起點及 終點之座標保存於記憶部，且判定接著要進行部分重寫區 域之起點與終點間之座標是否存在於記憶部，而於座標存 在時消除該座標。接著，判定記憶於記憶部之座標數是否 於預定值N以上，而於座標值在預定值N以上之時機進行全 晝面之重寫。 藉此，可抑制已進行部分重寫區域與其他區域之亮度 差太明顯。 實施形態係，由於在部分重寫區域包含其之前的部分 重寫區域之一部分（或全部）實，將其區域之起點或終點 (起點及終點）之座標消除，因此比起在部分重寫次數到 達一定值實進行全面重寫的方法，更能減少全面重寫之次 數。 【圖式簡單說明】 第1圖係顯示實施型態之電子紙裝置之構成之圖。 第2圖係實施型態之重寫處理之流程圖（1)。 第3圖係實施型態之重寫處理之流程圖（2)。 第4圖係顯示起點與終點之座標之圖。 第5圖係部份重寫時之座標之說明圖。 第6圖係電子紙之部分重寫之問題點之說明圖。 11 201037692 【主要元件符號說明】 ll···電子紙裝置 12…各種應用程式（群） 13…電子紙控制部 14…視訊驅動器 15…電子紙顯示部 16…VRAM 17…驅動電路 Sn~S28…步驟 21…表As a result, the memory unit stores six X coordinates of X, x2, x3, x4, yl, and y2. The portion where the nth time is set is rewritten as the horizontal rewriting, and the X-slot of the starting point of the rewriting area is shown as the X coordinate of the end point of the ’6. In this case, since the coordinates χ3 between the coordinates χ5 of the starting point and the X coordinate χ6 of the end point exist in the memory unit, the coordinate χ3 is eliminated from the memory unit. As a result, seven χ coordinates of x2, x3, x4, x5, yl, and y2 are stored in the memory unit. When the coordinates between the coordinates χ5 and the end point x coordinates x6 of the starting point of the nth partial rewriting region are present in the memory portion, the region with the coordinate xl as the starting point is made by performing the nth partial rewriting ' Some (or all) are also rewritten. As a result, since the difference in luminance between the n-th partial overwrite area and the area (or all) of one of the areas including the coordinates x1 included in the domain 201037692 is negligible, the coordinate x1 is eliminated by the memory. Moreover, the coordinates of the elimination are not limited to one, and when there are a plurality of coordinates in between, the coordinates can be eliminated. In the above embodiment, the coordinates of the start point and the end point of the partially rewritten area are stored in the memory unit, and it is determined whether or not the coordinate between the start point and the end point of the partial rewrite area is present in the memory unit, and the coordinates exist. Eliminate the coordinates. Next, it is determined whether or not the number of coordinates stored in the memory unit is equal to or greater than a predetermined value N, and the full-surface rewriting is performed at a timing when the coordinate value is equal to or greater than a predetermined value N. Thereby, it is possible to suppress the difference in luminance between the partially rewritten area and the other areas from being too significant. In the embodiment, since the partial overwrite region includes a part (or all) of the partial overwrite region before it is removed, the coordinates of the start point or the end point (starting point and end point) of the region are eliminated, and thus the number of times of partial rewriting is compared. A method of full rewriting to a certain value can reduce the number of full rewrites. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of an electronic paper apparatus of an embodiment. Fig. 2 is a flow chart (1) of the rewriting process of the embodiment. Fig. 3 is a flow chart (2) of the rewriting process of the implementation type. Figure 4 is a diagram showing the coordinates of the start and end points. Figure 5 is an explanatory diagram of coordinates when partially rewritten. Fig. 6 is an explanatory diagram of a problem point of partial rewriting of electronic paper. 11 201037692 [Description of main component symbols] ll···E-paper device 12...Applications (groups) 13...Electronic paper control unit 14...Video driver 15...Electronic paper display unit 16...VRAM 17...Drive circuit Sn~S28... Step 21...Table
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